]> git.saurik.com Git - redis.git/blob - redis.c
projects / redis.git / blob
? search:


371f789081805346ab3539c2e863aa70e50f5019
[redis.git] / redis.c
1 /*
2 * Copyright (c) 2006-2009, Salvatore Sanfilippo <antirez at gmail dot com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * * Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * * Neither the name of Redis nor the names of its contributors may be used
14 * to endorse or promote products derived from this software without
15 * specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #define REDIS_VERSION "1.1.91"
31
32 #include "fmacros.h"
33 #include "config.h"
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <time.h>
39 #include <unistd.h>
40 #define __USE_POSIX199309
41 #include <signal.h>
42
43 #ifdef HAVE_BACKTRACE
44 #include <execinfo.h>
45 #include <ucontext.h>
46 #endif /* HAVE_BACKTRACE */
47
48 #include <sys/wait.h>
49 #include <errno.h>
50 #include <assert.h>
51 #include <ctype.h>
52 #include <stdarg.h>
53 #include <inttypes.h>
54 #include <arpa/inet.h>
55 #include <sys/stat.h>
56 #include <fcntl.h>
57 #include <sys/time.h>
58 #include <sys/resource.h>
59 #include <sys/uio.h>
60 #include <limits.h>
61 #include <math.h>
62
63 #if defined(__sun)
64 #include "solarisfixes.h"
65 #endif
66
67 #include "redis.h"
68 #include "ae.h" /* Event driven programming library */
69 #include "sds.h" /* Dynamic safe strings */
70 #include "anet.h" /* Networking the easy way */
71 #include "dict.h" /* Hash tables */
72 #include "adlist.h" /* Linked lists */
73 #include "zmalloc.h" /* total memory usage aware version of malloc/free */
74 #include "lzf.h" /* LZF compression library */
75 #include "pqsort.h" /* Partial qsort for SORT+LIMIT */
76
77 /* Error codes */
78 #define REDIS_OK 0
79 #define REDIS_ERR -1
80
81 /* Static server configuration */
82 #define REDIS_SERVERPORT 6379 /* TCP port */
83 #define REDIS_MAXIDLETIME (60*5) /* default client timeout */
84 #define REDIS_IOBUF_LEN 1024
85 #define REDIS_LOADBUF_LEN 1024
86 #define REDIS_STATIC_ARGS 4
87 #define REDIS_DEFAULT_DBNUM 16
88 #define REDIS_CONFIGLINE_MAX 1024
89 #define REDIS_OBJFREELIST_MAX 1000000 /* Max number of objects to cache */
90 #define REDIS_MAX_SYNC_TIME 60 /* Slave can't take more to sync */
91 #define REDIS_EXPIRELOOKUPS_PER_CRON 100 /* try to expire 100 keys/second */
92 #define REDIS_MAX_WRITE_PER_EVENT (1024*64)
93 #define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
94
95 /* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
96 #define REDIS_WRITEV_THRESHOLD 3
97 /* Max number of iovecs used for each writev call */
98 #define REDIS_WRITEV_IOVEC_COUNT 256
99
100 /* Hash table parameters */
101 #define REDIS_HT_MINFILL 10 /* Minimal hash table fill 10% */
102
103 /* Command flags */
104 #define REDIS_CMD_BULK 1 /* Bulk write command */
105 #define REDIS_CMD_INLINE 2 /* Inline command */
106 /* REDIS_CMD_DENYOOM reserves a longer comment: all the commands marked with
107 this flags will return an error when the 'maxmemory' option is set in the
108 config file and the server is using more than maxmemory bytes of memory.
109 In short this commands are denied on low memory conditions. */
110 #define REDIS_CMD_DENYOOM 4
111
112 /* Object types */
113 #define REDIS_STRING 0
114 #define REDIS_LIST 1
115 #define REDIS_SET 2
116 #define REDIS_ZSET 3
117 #define REDIS_HASH 4
118
119 /* Objects encoding */
120 #define REDIS_ENCODING_RAW 0 /* Raw representation */
121 #define REDIS_ENCODING_INT 1 /* Encoded as integer */
122
123 /* Object types only used for dumping to disk */
124 #define REDIS_EXPIRETIME 253
125 #define REDIS_SELECTDB 254
126 #define REDIS_EOF 255
127
128 /* Defines related to the dump file format. To store 32 bits lengths for short
129 * keys requires a lot of space, so we check the most significant 2 bits of
130 * the first byte to interpreter the length:
131 *
132 * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
133 * 01|000000 00000000 => 01, the len is 14 byes, 6 bits + 8 bits of next byte
134 * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
135 * 11|000000 this means: specially encoded object will follow. The six bits
136 * number specify the kind of object that follows.
137 * See the REDIS_RDB_ENC_* defines.
138 *
139 * Lenghts up to 63 are stored using a single byte, most DB keys, and may
140 * values, will fit inside. */
141 #define REDIS_RDB_6BITLEN 0
142 #define REDIS_RDB_14BITLEN 1
143 #define REDIS_RDB_32BITLEN 2
144 #define REDIS_RDB_ENCVAL 3
145 #define REDIS_RDB_LENERR UINT_MAX
146
147 /* When a length of a string object stored on disk has the first two bits
148 * set, the remaining two bits specify a special encoding for the object
149 * accordingly to the following defines: */
150 #define REDIS_RDB_ENC_INT8 0 /* 8 bit signed integer */
151 #define REDIS_RDB_ENC_INT16 1 /* 16 bit signed integer */
152 #define REDIS_RDB_ENC_INT32 2 /* 32 bit signed integer */
153 #define REDIS_RDB_ENC_LZF 3 /* string compressed with FASTLZ */
154
155 /* Client flags */
156 #define REDIS_CLOSE 1 /* This client connection should be closed ASAP */
157 #define REDIS_SLAVE 2 /* This client is a slave server */
158 #define REDIS_MASTER 4 /* This client is a master server */
159 #define REDIS_MONITOR 8 /* This client is a slave monitor, see MONITOR */
160
161 /* Slave replication state - slave side */
162 #define REDIS_REPL_NONE 0 /* No active replication */
163 #define REDIS_REPL_CONNECT 1 /* Must connect to master */
164 #define REDIS_REPL_CONNECTED 2 /* Connected to master */
165
166 /* Slave replication state - from the point of view of master
167 * Note that in SEND_BULK and ONLINE state the slave receives new updates
168 * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
169 * to start the next background saving in order to send updates to it. */
170 #define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
171 #define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
172 #define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
173 #define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
174
175 /* List related stuff */
176 #define REDIS_HEAD 0
177 #define REDIS_TAIL 1
178
179 /* Sort operations */
180 #define REDIS_SORT_GET 0
181 #define REDIS_SORT_ASC 1
182 #define REDIS_SORT_DESC 2
183 #define REDIS_SORTKEY_MAX 1024
184
185 /* Log levels */
186 #define REDIS_DEBUG 0
187 #define REDIS_NOTICE 1
188 #define REDIS_WARNING 2
189
190 /* Anti-warning macro... */
191 #define REDIS_NOTUSED(V) ((void) V)
192
193 #define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */
194 #define ZSKIPLIST_P 0.25 /* Skiplist P = 1/4 */
195
196 /* Append only defines */
197 #define APPENDFSYNC_NO 0
198 #define APPENDFSYNC_ALWAYS 1
199 #define APPENDFSYNC_EVERYSEC 2
200
201 /* We can print the stacktrace, so our assert is defined this way: */
202 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e),exit(1)))
203 static void _redisAssert(char *estr);
204
205 /*================================= Data types ============================== */
206
207 /* A redis object, that is a type able to hold a string / list / set */
208 typedef struct redisObject {
209 void *ptr;
210 unsigned char type;
211 unsigned char encoding;
212 unsigned char notused[2];
213 int refcount;
214 } robj;
215
216 /* Macro used to initalize a Redis object allocated on the stack.
217 * Note that this macro is taken near the structure definition to make sure
218 * we'll update it when the structure is changed, to avoid bugs like
219 * bug #85 introduced exactly in this way. */
220 #define initStaticStringObject(_var,_ptr) do { \
221 _var.refcount = 1; \
222 _var.type = REDIS_STRING; \
223 _var.encoding = REDIS_ENCODING_RAW; \
224 _var.ptr = _ptr; \
225 } while(0);
226
227 typedef struct redisDb {
228 dict *dict;
229 dict *expires;
230 int id;
231 } redisDb;
232
233 /* With multiplexing we need to take per-clinet state.
234 * Clients are taken in a liked list. */
235 typedef struct redisClient {
236 int fd;
237 redisDb *db;
238 int dictid;
239 sds querybuf;
240 robj **argv, **mbargv;
241 int argc, mbargc;
242 int bulklen; /* bulk read len. -1 if not in bulk read mode */
243 int multibulk; /* multi bulk command format active */
244 list *reply;
245 int sentlen;
246 time_t lastinteraction; /* time of the last interaction, used for timeout */
247 int flags; /* REDIS_CLOSE | REDIS_SLAVE | REDIS_MONITOR */
248 int slaveseldb; /* slave selected db, if this client is a slave */
249 int authenticated; /* when requirepass is non-NULL */
250 int replstate; /* replication state if this is a slave */
251 int repldbfd; /* replication DB file descriptor */
252 long repldboff; /* replication DB file offset */
253 off_t repldbsize; /* replication DB file size */
254 } redisClient;
255
256 struct saveparam {
257 time_t seconds;
258 int changes;
259 };
260
261 /* Global server state structure */
262 struct redisServer {
263 int port;
264 int fd;
265 redisDb *db;
266 dict *sharingpool;
267 unsigned int sharingpoolsize;
268 long long dirty; /* changes to DB from the last save */
269 list *clients;
270 list *slaves, *monitors;
271 char neterr[ANET_ERR_LEN];
272 aeEventLoop *el;
273 int cronloops; /* number of times the cron function run */
274 list *objfreelist; /* A list of freed objects to avoid malloc() */
275 time_t lastsave; /* Unix time of last save succeeede */
276 size_t usedmemory; /* Used memory in megabytes */
277 /* Fields used only for stats */
278 time_t stat_starttime; /* server start time */
279 long long stat_numcommands; /* number of processed commands */
280 long long stat_numconnections; /* number of connections received */
281 /* Configuration */
282 int verbosity;
283 int glueoutputbuf;
284 int maxidletime;
285 int dbnum;
286 int daemonize;
287 int appendonly;
288 int appendfsync;
289 time_t lastfsync;
290 int appendfd;
291 int appendseldb;
292 char *pidfile;
293 pid_t bgsavechildpid;
294 pid_t bgrewritechildpid;
295 sds bgrewritebuf; /* buffer taken by parent during oppend only rewrite */
296 struct saveparam *saveparams;
297 int saveparamslen;
298 char *logfile;
299 char *bindaddr;
300 char *dbfilename;
301 char *appendfilename;
302 char *requirepass;
303 int shareobjects;
304 /* Replication related */
305 int isslave;
306 char *masterauth;
307 char *masterhost;
308 int masterport;
309 redisClient *master; /* client that is master for this slave */
310 int replstate;
311 unsigned int maxclients;
312 unsigned long maxmemory;
313 /* Sort parameters - qsort_r() is only available under BSD so we
314 * have to take this state global, in order to pass it to sortCompare() */
315 int sort_desc;
316 int sort_alpha;
317 int sort_bypattern;
318 };
319
320 typedef void redisCommandProc(redisClient *c);
321 struct redisCommand {
322 char *name;
323 redisCommandProc *proc;
324 int arity;
325 int flags;
326 };
327
328 struct redisFunctionSym {
329 char *name;
330 unsigned long pointer;
331 };
332
333 typedef struct _redisSortObject {
334 robj *obj;
335 union {
336 double score;
337 robj *cmpobj;
338 } u;
339 } redisSortObject;
340
341 typedef struct _redisSortOperation {
342 int type;
343 robj *pattern;
344 } redisSortOperation;
345
346 /* ZSETs use a specialized version of Skiplists */
347
348 typedef struct zskiplistNode {
349 struct zskiplistNode **forward;
350 struct zskiplistNode *backward;
351 double score;
352 robj *obj;
353 } zskiplistNode;
354
355 typedef struct zskiplist {
356 struct zskiplistNode *header, *tail;
357 unsigned long length;
358 int level;
359 } zskiplist;
360
361 typedef struct zset {
362 dict *dict;
363 zskiplist *zsl;
364 } zset;
365
366 /* Our shared "common" objects */
367
368 struct sharedObjectsStruct {
369 robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *pong, *space,
370 *colon, *nullbulk, *nullmultibulk,
371 *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
372 *outofrangeerr, *plus,
373 *select0, *select1, *select2, *select3, *select4,
374 *select5, *select6, *select7, *select8, *select9;
375 } shared;
376
377 /* Global vars that are actally used as constants. The following double
378 * values are used for double on-disk serialization, and are initialized
379 * at runtime to avoid strange compiler optimizations. */
380
381 static double R_Zero, R_PosInf, R_NegInf, R_Nan;
382
383 /*================================ Prototypes =============================== */
384
385 static void freeStringObject(robj *o);
386 static void freeListObject(robj *o);
387 static void freeSetObject(robj *o);
388 static void decrRefCount(void *o);
389 static robj *createObject(int type, void *ptr);
390 static void freeClient(redisClient *c);
391 static int rdbLoad(char *filename);
392 static void addReply(redisClient *c, robj *obj);
393 static void addReplySds(redisClient *c, sds s);
394 static void incrRefCount(robj *o);
395 static int rdbSaveBackground(char *filename);
396 static robj *createStringObject(char *ptr, size_t len);
397 static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc);
398 static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
399 static int syncWithMaster(void);
400 static robj *tryObjectSharing(robj *o);
401 static int tryObjectEncoding(robj *o);
402 static robj *getDecodedObject(robj *o);
403 static int removeExpire(redisDb *db, robj *key);
404 static int expireIfNeeded(redisDb *db, robj *key);
405 static int deleteIfVolatile(redisDb *db, robj *key);
406 static int deleteKey(redisDb *db, robj *key);
407 static time_t getExpire(redisDb *db, robj *key);
408 static int setExpire(redisDb *db, robj *key, time_t when);
409 static void updateSlavesWaitingBgsave(int bgsaveerr);
410 static void freeMemoryIfNeeded(void);
411 static int processCommand(redisClient *c);
412 static void setupSigSegvAction(void);
413 static void rdbRemoveTempFile(pid_t childpid);
414 static void aofRemoveTempFile(pid_t childpid);
415 static size_t stringObjectLen(robj *o);
416 static void processInputBuffer(redisClient *c);
417 static zskiplist *zslCreate(void);
418 static void zslFree(zskiplist *zsl);
419 static void zslInsert(zskiplist *zsl, double score, robj *obj);
420 static void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
421
422 static void authCommand(redisClient *c);
423 static void pingCommand(redisClient *c);
424 static void echoCommand(redisClient *c);
425 static void setCommand(redisClient *c);
426 static void setnxCommand(redisClient *c);
427 static void getCommand(redisClient *c);
428 static void delCommand(redisClient *c);
429 static void existsCommand(redisClient *c);
430 static void incrCommand(redisClient *c);
431 static void decrCommand(redisClient *c);
432 static void incrbyCommand(redisClient *c);
433 static void decrbyCommand(redisClient *c);
434 static void selectCommand(redisClient *c);
435 static void randomkeyCommand(redisClient *c);
436 static void keysCommand(redisClient *c);
437 static void dbsizeCommand(redisClient *c);
438 static void lastsaveCommand(redisClient *c);
439 static void saveCommand(redisClient *c);
440 static void bgsaveCommand(redisClient *c);
441 static void bgrewriteaofCommand(redisClient *c);
442 static void shutdownCommand(redisClient *c);
443 static void moveCommand(redisClient *c);
444 static void renameCommand(redisClient *c);
445 static void renamenxCommand(redisClient *c);
446 static void lpushCommand(redisClient *c);
447 static void rpushCommand(redisClient *c);
448 static void lpopCommand(redisClient *c);
449 static void rpopCommand(redisClient *c);
450 static void llenCommand(redisClient *c);
451 static void lindexCommand(redisClient *c);
452 static void lrangeCommand(redisClient *c);
453 static void ltrimCommand(redisClient *c);
454 static void typeCommand(redisClient *c);
455 static void lsetCommand(redisClient *c);
456 static void saddCommand(redisClient *c);
457 static void sremCommand(redisClient *c);
458 static void smoveCommand(redisClient *c);
459 static void sismemberCommand(redisClient *c);
460 static void scardCommand(redisClient *c);
461 static void spopCommand(redisClient *c);
462 static void srandmemberCommand(redisClient *c);
463 static void sinterCommand(redisClient *c);
464 static void sinterstoreCommand(redisClient *c);
465 static void sunionCommand(redisClient *c);
466 static void sunionstoreCommand(redisClient *c);
467 static void sdiffCommand(redisClient *c);
468 static void sdiffstoreCommand(redisClient *c);
469 static void syncCommand(redisClient *c);
470 static void flushdbCommand(redisClient *c);
471 static void flushallCommand(redisClient *c);
472 static void sortCommand(redisClient *c);
473 static void lremCommand(redisClient *c);
474 static void rpoplpushcommand(redisClient *c);
475 static void infoCommand(redisClient *c);
476 static void mgetCommand(redisClient *c);
477 static void monitorCommand(redisClient *c);
478 static void expireCommand(redisClient *c);
479 static void expireatCommand(redisClient *c);
480 static void getsetCommand(redisClient *c);
481 static void ttlCommand(redisClient *c);
482 static void slaveofCommand(redisClient *c);
483 static void debugCommand(redisClient *c);
484 static void msetCommand(redisClient *c);
485 static void msetnxCommand(redisClient *c);
486 static void zaddCommand(redisClient *c);
487 static void zincrbyCommand(redisClient *c);
488 static void zrangeCommand(redisClient *c);
489 static void zrangebyscoreCommand(redisClient *c);
490 static void zrevrangeCommand(redisClient *c);
491 static void zcardCommand(redisClient *c);
492 static void zremCommand(redisClient *c);
493 static void zscoreCommand(redisClient *c);
494 static void zremrangebyscoreCommand(redisClient *c);
495
496 /*================================= Globals ================================= */
497
498 /* Global vars */
499 static struct redisServer server; /* server global state */
500 static struct redisCommand cmdTable[] = {
501 {"get",getCommand,2,REDIS_CMD_INLINE},
502 {"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
503 {"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
504 {"del",delCommand,-2,REDIS_CMD_INLINE},
505 {"exists",existsCommand,2,REDIS_CMD_INLINE},
506 {"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
507 {"decr",decrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
508 {"mget",mgetCommand,-2,REDIS_CMD_INLINE},
509 {"rpush",rpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
510 {"lpush",lpushCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
511 {"rpop",rpopCommand,2,REDIS_CMD_INLINE},
512 {"lpop",lpopCommand,2,REDIS_CMD_INLINE},
513 {"llen",llenCommand,2,REDIS_CMD_INLINE},
514 {"lindex",lindexCommand,3,REDIS_CMD_INLINE},
515 {"lset",lsetCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
516 {"lrange",lrangeCommand,4,REDIS_CMD_INLINE},
517 {"ltrim",ltrimCommand,4,REDIS_CMD_INLINE},
518 {"lrem",lremCommand,4,REDIS_CMD_BULK},
519 {"rpoplpush",rpoplpushcommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
520 {"sadd",saddCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
521 {"srem",sremCommand,3,REDIS_CMD_BULK},
522 {"smove",smoveCommand,4,REDIS_CMD_BULK},
523 {"sismember",sismemberCommand,3,REDIS_CMD_BULK},
524 {"scard",scardCommand,2,REDIS_CMD_INLINE},
525 {"spop",spopCommand,2,REDIS_CMD_INLINE},
526 {"srandmember",srandmemberCommand,2,REDIS_CMD_INLINE},
527 {"sinter",sinterCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
528 {"sinterstore",sinterstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
529 {"sunion",sunionCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
530 {"sunionstore",sunionstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
531 {"sdiff",sdiffCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
532 {"sdiffstore",sdiffstoreCommand,-3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
533 {"smembers",sinterCommand,2,REDIS_CMD_INLINE},
534 {"zadd",zaddCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
535 {"zincrby",zincrbyCommand,4,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
536 {"zrem",zremCommand,3,REDIS_CMD_BULK},
537 {"zremrangebyscore",zremrangebyscoreCommand,4,REDIS_CMD_INLINE},
538 {"zrange",zrangeCommand,4,REDIS_CMD_INLINE},
539 {"zrangebyscore",zrangebyscoreCommand,-4,REDIS_CMD_INLINE},
540 {"zrevrange",zrevrangeCommand,4,REDIS_CMD_INLINE},
541 {"zcard",zcardCommand,2,REDIS_CMD_INLINE},
542 {"zscore",zscoreCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
543 {"incrby",incrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
544 {"decrby",decrbyCommand,3,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
545 {"getset",getsetCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
546 {"mset",msetCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
547 {"msetnx",msetnxCommand,-3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM},
548 {"randomkey",randomkeyCommand,1,REDIS_CMD_INLINE},
549 {"select",selectCommand,2,REDIS_CMD_INLINE},
550 {"move",moveCommand,3,REDIS_CMD_INLINE},
551 {"rename",renameCommand,3,REDIS_CMD_INLINE},
552 {"renamenx",renamenxCommand,3,REDIS_CMD_INLINE},
553 {"expire",expireCommand,3,REDIS_CMD_INLINE},
554 {"expireat",expireatCommand,3,REDIS_CMD_INLINE},
555 {"keys",keysCommand,2,REDIS_CMD_INLINE},
556 {"dbsize",dbsizeCommand,1,REDIS_CMD_INLINE},
557 {"auth",authCommand,2,REDIS_CMD_INLINE},
558 {"ping",pingCommand,1,REDIS_CMD_INLINE},
559 {"echo",echoCommand,2,REDIS_CMD_BULK},
560 {"save",saveCommand,1,REDIS_CMD_INLINE},
561 {"bgsave",bgsaveCommand,1,REDIS_CMD_INLINE},
562 {"bgrewriteaof",bgrewriteaofCommand,1,REDIS_CMD_INLINE},
563 {"shutdown",shutdownCommand,1,REDIS_CMD_INLINE},
564 {"lastsave",lastsaveCommand,1,REDIS_CMD_INLINE},
565 {"type",typeCommand,2,REDIS_CMD_INLINE},
566 {"sync",syncCommand,1,REDIS_CMD_INLINE},
567 {"flushdb",flushdbCommand,1,REDIS_CMD_INLINE},
568 {"flushall",flushallCommand,1,REDIS_CMD_INLINE},
569 {"sort",sortCommand,-2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM},
570 {"info",infoCommand,1,REDIS_CMD_INLINE},
571 {"monitor",monitorCommand,1,REDIS_CMD_INLINE},
572 {"ttl",ttlCommand,2,REDIS_CMD_INLINE},
573 {"slaveof",slaveofCommand,3,REDIS_CMD_INLINE},
574 {"debug",debugCommand,-2,REDIS_CMD_INLINE},
575 {NULL,NULL,0,0}
576 };
577
578 /*============================ Utility functions ============================ */
579
580 /* Glob-style pattern matching. */
581 int stringmatchlen(const char *pattern, int patternLen,
582 const char *string, int stringLen, int nocase)
583 {
584 while(patternLen) {
585 switch(pattern[0]) {
586 case '*':
587 while (pattern[1] == '*') {
588 pattern++;
589 patternLen--;
590 }
591 if (patternLen == 1)
592 return 1; /* match */
593 while(stringLen) {
594 if (stringmatchlen(pattern+1, patternLen-1,
595 string, stringLen, nocase))
596 return 1; /* match */
597 string++;
598 stringLen--;
599 }
600 return 0; /* no match */
601 break;
602 case '?':
603 if (stringLen == 0)
604 return 0; /* no match */
605 string++;
606 stringLen--;
607 break;
608 case '[':
609 {
610 int not, match;
611
612 pattern++;
613 patternLen--;
614 not = pattern[0] == '^';
615 if (not) {
616 pattern++;
617 patternLen--;
618 }
619 match = 0;
620 while(1) {
621 if (pattern[0] == '\\') {
622 pattern++;
623 patternLen--;
624 if (pattern[0] == string[0])
625 match = 1;
626 } else if (pattern[0] == ']') {
627 break;
628 } else if (patternLen == 0) {
629 pattern--;
630 patternLen++;
631 break;
632 } else if (pattern[1] == '-' && patternLen >= 3) {
633 int start = pattern[0];
634 int end = pattern[2];
635 int c = string[0];
636 if (start > end) {
637 int t = start;
638 start = end;
639 end = t;
640 }
641 if (nocase) {
642 start = tolower(start);
643 end = tolower(end);
644 c = tolower(c);
645 }
646 pattern += 2;
647 patternLen -= 2;
648 if (c >= start && c <= end)
649 match = 1;
650 } else {
651 if (!nocase) {
652 if (pattern[0] == string[0])
653 match = 1;
654 } else {
655 if (tolower((int)pattern[0]) == tolower((int)string[0]))
656 match = 1;
657 }
658 }
659 pattern++;
660 patternLen--;
661 }
662 if (not)
663 match = !match;
664 if (!match)
665 return 0; /* no match */
666 string++;
667 stringLen--;
668 break;
669 }
670 case '\\':
671 if (patternLen >= 2) {
672 pattern++;
673 patternLen--;
674 }
675 /* fall through */
676 default:
677 if (!nocase) {
678 if (pattern[0] != string[0])
679 return 0; /* no match */
680 } else {
681 if (tolower((int)pattern[0]) != tolower((int)string[0]))
682 return 0; /* no match */
683 }
684 string++;
685 stringLen--;
686 break;
687 }
688 pattern++;
689 patternLen--;
690 if (stringLen == 0) {
691 while(*pattern == '*') {
692 pattern++;
693 patternLen--;
694 }
695 break;
696 }
697 }
698 if (patternLen == 0 && stringLen == 0)
699 return 1;
700 return 0;
701 }
702
703 static void redisLog(int level, const char *fmt, ...) {
704 va_list ap;
705 FILE *fp;
706
707 fp = (server.logfile == NULL) ? stdout : fopen(server.logfile,"a");
708 if (!fp) return;
709
710 va_start(ap, fmt);
711 if (level >= server.verbosity) {
712 char *c = ".-*";
713 char buf[64];
714 time_t now;
715
716 now = time(NULL);
717 strftime(buf,64,"%d %b %H:%M:%S",localtime(&now));
718 fprintf(fp,"%s %c ",buf,c[level]);
719 vfprintf(fp, fmt, ap);
720 fprintf(fp,"\n");
721 fflush(fp);
722 }
723 va_end(ap);
724
725 if (server.logfile) fclose(fp);
726 }
727
728 /*====================== Hash table type implementation ==================== */
729
730 /* This is an hash table type that uses the SDS dynamic strings libary as
731 * keys and radis objects as values (objects can hold SDS strings,
732 * lists, sets). */
733
734 static void dictVanillaFree(void *privdata, void *val)
735 {
736 DICT_NOTUSED(privdata);
737 zfree(val);
738 }
739
740 static int sdsDictKeyCompare(void *privdata, const void *key1,
741 const void *key2)
742 {
743 int l1,l2;
744 DICT_NOTUSED(privdata);
745
746 l1 = sdslen((sds)key1);
747 l2 = sdslen((sds)key2);
748 if (l1 != l2) return 0;
749 return memcmp(key1, key2, l1) == 0;
750 }
751
752 static void dictRedisObjectDestructor(void *privdata, void *val)
753 {
754 DICT_NOTUSED(privdata);
755
756 decrRefCount(val);
757 }
758
759 static int dictObjKeyCompare(void *privdata, const void *key1,
760 const void *key2)
761 {
762 const robj *o1 = key1, *o2 = key2;
763 return sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
764 }
765
766 static unsigned int dictObjHash(const void *key) {
767 const robj *o = key;
768 return dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
769 }
770
771 static int dictEncObjKeyCompare(void *privdata, const void *key1,
772 const void *key2)
773 {
774 robj *o1 = (robj*) key1, *o2 = (robj*) key2;
775 int cmp;
776
777 o1 = getDecodedObject(o1);
778 o2 = getDecodedObject(o2);
779 cmp = sdsDictKeyCompare(privdata,o1->ptr,o2->ptr);
780 decrRefCount(o1);
781 decrRefCount(o2);
782 return cmp;
783 }
784
785 static unsigned int dictEncObjHash(const void *key) {
786 robj *o = (robj*) key;
787
788 o = getDecodedObject(o);
789 unsigned int hash = dictGenHashFunction(o->ptr, sdslen((sds)o->ptr));
790 decrRefCount(o);
791 return hash;
792 }
793
794 static dictType setDictType = {
795 dictEncObjHash, /* hash function */
796 NULL, /* key dup */
797 NULL, /* val dup */
798 dictEncObjKeyCompare, /* key compare */
799 dictRedisObjectDestructor, /* key destructor */
800 NULL /* val destructor */
801 };
802
803 static dictType zsetDictType = {
804 dictEncObjHash, /* hash function */
805 NULL, /* key dup */
806 NULL, /* val dup */
807 dictEncObjKeyCompare, /* key compare */
808 dictRedisObjectDestructor, /* key destructor */
809 dictVanillaFree /* val destructor of malloc(sizeof(double)) */
810 };
811
812 static dictType hashDictType = {
813 dictObjHash, /* hash function */
814 NULL, /* key dup */
815 NULL, /* val dup */
816 dictObjKeyCompare, /* key compare */
817 dictRedisObjectDestructor, /* key destructor */
818 dictRedisObjectDestructor /* val destructor */
819 };
820
821 /* ========================= Random utility functions ======================= */
822
823 /* Redis generally does not try to recover from out of memory conditions
824 * when allocating objects or strings, it is not clear if it will be possible
825 * to report this condition to the client since the networking layer itself
826 * is based on heap allocation for send buffers, so we simply abort.
827 * At least the code will be simpler to read... */
828 static void oom(const char *msg) {
829 redisLog(REDIS_WARNING, "%s: Out of memory\n",msg);
830 sleep(1);
831 abort();
832 }
833
834 /* ====================== Redis server networking stuff ===================== */
835 static void closeTimedoutClients(void) {
836 redisClient *c;
837 listNode *ln;
838 time_t now = time(NULL);
839
840 listRewind(server.clients);
841 while ((ln = listYield(server.clients)) != NULL) {
842 c = listNodeValue(ln);
843 if (!(c->flags & REDIS_SLAVE) && /* no timeout for slaves */
844 !(c->flags & REDIS_MASTER) && /* no timeout for masters */
845 (now - c->lastinteraction > server.maxidletime)) {
846 redisLog(REDIS_DEBUG,"Closing idle client");
847 freeClient(c);
848 }
849 }
850 }
851
852 static int htNeedsResize(dict *dict) {
853 long long size, used;
854
855 size = dictSlots(dict);
856 used = dictSize(dict);
857 return (size && used && size > DICT_HT_INITIAL_SIZE &&
858 (used*100/size < REDIS_HT_MINFILL));
859 }
860
861 /* If the percentage of used slots in the HT reaches REDIS_HT_MINFILL
862 * we resize the hash table to save memory */
863 static void tryResizeHashTables(void) {
864 int j;
865
866 for (j = 0; j < server.dbnum; j++) {
867 if (htNeedsResize(server.db[j].dict)) {
868 redisLog(REDIS_DEBUG,"The hash table %d is too sparse, resize it...",j);
869 dictResize(server.db[j].dict);
870 redisLog(REDIS_DEBUG,"Hash table %d resized.",j);
871 }
872 if (htNeedsResize(server.db[j].expires))
873 dictResize(server.db[j].expires);
874 }
875 }
876
877 /* A background saving child (BGSAVE) terminated its work. Handle this. */
878 void backgroundSaveDoneHandler(int statloc) {
879 int exitcode = WEXITSTATUS(statloc);
880 int bysignal = WIFSIGNALED(statloc);
881
882 if (!bysignal && exitcode == 0) {
883 redisLog(REDIS_NOTICE,
884 "Background saving terminated with success");
885 server.dirty = 0;
886 server.lastsave = time(NULL);
887 } else if (!bysignal && exitcode != 0) {
888 redisLog(REDIS_WARNING, "Background saving error");
889 } else {
890 redisLog(REDIS_WARNING,
891 "Background saving terminated by signal");
892 rdbRemoveTempFile(server.bgsavechildpid);
893 }
894 server.bgsavechildpid = -1;
895 /* Possibly there are slaves waiting for a BGSAVE in order to be served
896 * (the first stage of SYNC is a bulk transfer of dump.rdb) */
897 updateSlavesWaitingBgsave(exitcode == 0 ? REDIS_OK : REDIS_ERR);
898 }
899
900 /* A background append only file rewriting (BGREWRITEAOF) terminated its work.
901 * Handle this. */
902 void backgroundRewriteDoneHandler(int statloc) {
903 int exitcode = WEXITSTATUS(statloc);
904 int bysignal = WIFSIGNALED(statloc);
905
906 if (!bysignal && exitcode == 0) {
907 int fd;
908 char tmpfile[256];
909
910 redisLog(REDIS_NOTICE,
911 "Background append only file rewriting terminated with success");
912 /* Now it's time to flush the differences accumulated by the parent */
913 snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) server.bgrewritechildpid);
914 fd = open(tmpfile,O_WRONLY|O_APPEND);
915 if (fd == -1) {
916 redisLog(REDIS_WARNING, "Not able to open the temp append only file produced by the child: %s", strerror(errno));
917 goto cleanup;
918 }
919 /* Flush our data... */
920 if (write(fd,server.bgrewritebuf,sdslen(server.bgrewritebuf)) !=
921 (signed) sdslen(server.bgrewritebuf)) {
922 redisLog(REDIS_WARNING, "Error or short write trying to flush the parent diff of the append log file in the child temp file: %s", strerror(errno));
923 close(fd);
924 goto cleanup;
925 }
926 redisLog(REDIS_WARNING,"Parent diff flushed into the new append log file with success");
927 /* Now our work is to rename the temp file into the stable file. And
928 * switch the file descriptor used by the server for append only. */
929 if (rename(tmpfile,server.appendfilename) == -1) {
930 redisLog(REDIS_WARNING,"Can't rename the temp append only file into the stable one: %s", strerror(errno));
931 close(fd);
932 goto cleanup;
933 }
934 /* Mission completed... almost */
935 redisLog(REDIS_NOTICE,"Append only file successfully rewritten.");
936 if (server.appendfd != -1) {
937 /* If append only is actually enabled... */
938 close(server.appendfd);
939 server.appendfd = fd;
940 fsync(fd);
941 server.appendseldb = -1; /* Make sure it will issue SELECT */
942 redisLog(REDIS_NOTICE,"The new append only file was selected for future appends.");
943 } else {
944 /* If append only is disabled we just generate a dump in this
945 * format. Why not? */
946 close(fd);
947 }
948 } else if (!bysignal && exitcode != 0) {
949 redisLog(REDIS_WARNING, "Background append only file rewriting error");
950 } else {
951 redisLog(REDIS_WARNING,
952 "Background append only file rewriting terminated by signal");
953 }
954 cleanup:
955 sdsfree(server.bgrewritebuf);
956 server.bgrewritebuf = sdsempty();
957 aofRemoveTempFile(server.bgrewritechildpid);
958 server.bgrewritechildpid = -1;
959 }
960
961 static int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
962 int j, loops = server.cronloops++;
963 REDIS_NOTUSED(eventLoop);
964 REDIS_NOTUSED(id);
965 REDIS_NOTUSED(clientData);
966
967 /* Update the global state with the amount of used memory */
968 server.usedmemory = zmalloc_used_memory();
969
970 /* Show some info about non-empty databases */
971 for (j = 0; j < server.dbnum; j++) {
972 long long size, used, vkeys;
973
974 size = dictSlots(server.db[j].dict);
975 used = dictSize(server.db[j].dict);
976 vkeys = dictSize(server.db[j].expires);
977 if (!(loops % 5) && (used || vkeys)) {
978 redisLog(REDIS_DEBUG,"DB %d: %lld keys (%lld volatile) in %lld slots HT.",j,used,vkeys,size);
979 /* dictPrintStats(server.dict); */
980 }
981 }
982
983 /* We don't want to resize the hash tables while a bacground saving
984 * is in progress: the saving child is created using fork() that is
985 * implemented with a copy-on-write semantic in most modern systems, so
986 * if we resize the HT while there is the saving child at work actually
987 * a lot of memory movements in the parent will cause a lot of pages
988 * copied. */
989 if (server.bgsavechildpid == -1) tryResizeHashTables();
990
991 /* Show information about connected clients */
992 if (!(loops % 5)) {
993 redisLog(REDIS_DEBUG,"%d clients connected (%d slaves), %zu bytes in use, %d shared objects",
994 listLength(server.clients)-listLength(server.slaves),
995 listLength(server.slaves),
996 server.usedmemory,
997 dictSize(server.sharingpool));
998 }
999
1000 /* Close connections of timedout clients */
1001 if (server.maxidletime && !(loops % 10))
1002 closeTimedoutClients();
1003
1004 /* Check if a background saving or AOF rewrite in progress terminated */
1005 if (server.bgsavechildpid != -1 || server.bgrewritechildpid != -1) {
1006 int statloc;
1007 pid_t pid;
1008
1009 if ((pid = wait3(&statloc,WNOHANG,NULL)) != 0) {
1010 if (pid == server.bgsavechildpid) {
1011 backgroundSaveDoneHandler(statloc);
1012 } else {
1013 backgroundRewriteDoneHandler(statloc);
1014 }
1015 }
1016 } else {
1017 /* If there is not a background saving in progress check if
1018 * we have to save now */
1019 time_t now = time(NULL);
1020 for (j = 0; j < server.saveparamslen; j++) {
1021 struct saveparam *sp = server.saveparams+j;
1022
1023 if (server.dirty >= sp->changes &&
1024 now-server.lastsave > sp->seconds) {
1025 redisLog(REDIS_NOTICE,"%d changes in %d seconds. Saving...",
1026 sp->changes, sp->seconds);
1027 rdbSaveBackground(server.dbfilename);
1028 break;
1029 }
1030 }
1031 }
1032
1033 /* Try to expire a few timed out keys. The algorithm used is adaptive and
1034 * will use few CPU cycles if there are few expiring keys, otherwise
1035 * it will get more aggressive to avoid that too much memory is used by
1036 * keys that can be removed from the keyspace. */
1037 for (j = 0; j < server.dbnum; j++) {
1038 int expired;
1039 redisDb *db = server.db+j;
1040
1041 /* Continue to expire if at the end of the cycle more than 25%
1042 * of the keys were expired. */
1043 do {
1044 int num = dictSize(db->expires);
1045 time_t now = time(NULL);
1046
1047 expired = 0;
1048 if (num > REDIS_EXPIRELOOKUPS_PER_CRON)
1049 num = REDIS_EXPIRELOOKUPS_PER_CRON;
1050 while (num--) {
1051 dictEntry *de;
1052 time_t t;
1053
1054 if ((de = dictGetRandomKey(db->expires)) == NULL) break;
1055 t = (time_t) dictGetEntryVal(de);
1056 if (now > t) {
1057 deleteKey(db,dictGetEntryKey(de));
1058 expired++;
1059 }
1060 }
1061 } while (expired > REDIS_EXPIRELOOKUPS_PER_CRON/4);
1062 }
1063
1064 /* Check if we should connect to a MASTER */
1065 if (server.replstate == REDIS_REPL_CONNECT) {
1066 redisLog(REDIS_NOTICE,"Connecting to MASTER...");
1067 if (syncWithMaster() == REDIS_OK) {
1068 redisLog(REDIS_NOTICE,"MASTER <-> SLAVE sync succeeded");
1069 }
1070 }
1071 return 1000;
1072 }
1073
1074 static void createSharedObjects(void) {
1075 shared.crlf = createObject(REDIS_STRING,sdsnew("\r\n"));
1076 shared.ok = createObject(REDIS_STRING,sdsnew("+OK\r\n"));
1077 shared.err = createObject(REDIS_STRING,sdsnew("-ERR\r\n"));
1078 shared.emptybulk = createObject(REDIS_STRING,sdsnew("$0\r\n\r\n"));
1079 shared.czero = createObject(REDIS_STRING,sdsnew(":0\r\n"));
1080 shared.cone = createObject(REDIS_STRING,sdsnew(":1\r\n"));
1081 shared.nullbulk = createObject(REDIS_STRING,sdsnew("$-1\r\n"));
1082 shared.nullmultibulk = createObject(REDIS_STRING,sdsnew("*-1\r\n"));
1083 shared.emptymultibulk = createObject(REDIS_STRING,sdsnew("*0\r\n"));
1084 /* no such key */
1085 shared.pong = createObject(REDIS_STRING,sdsnew("+PONG\r\n"));
1086 shared.wrongtypeerr = createObject(REDIS_STRING,sdsnew(
1087 "-ERR Operation against a key holding the wrong kind of value\r\n"));
1088 shared.nokeyerr = createObject(REDIS_STRING,sdsnew(
1089 "-ERR no such key\r\n"));
1090 shared.syntaxerr = createObject(REDIS_STRING,sdsnew(
1091 "-ERR syntax error\r\n"));
1092 shared.sameobjecterr = createObject(REDIS_STRING,sdsnew(
1093 "-ERR source and destination objects are the same\r\n"));
1094 shared.outofrangeerr = createObject(REDIS_STRING,sdsnew(
1095 "-ERR index out of range\r\n"));
1096 shared.space = createObject(REDIS_STRING,sdsnew(" "));
1097 shared.colon = createObject(REDIS_STRING,sdsnew(":"));
1098 shared.plus = createObject(REDIS_STRING,sdsnew("+"));
1099 shared.select0 = createStringObject("select 0\r\n",10);
1100 shared.select1 = createStringObject("select 1\r\n",10);
1101 shared.select2 = createStringObject("select 2\r\n",10);
1102 shared.select3 = createStringObject("select 3\r\n",10);
1103 shared.select4 = createStringObject("select 4\r\n",10);
1104 shared.select5 = createStringObject("select 5\r\n",10);
1105 shared.select6 = createStringObject("select 6\r\n",10);
1106 shared.select7 = createStringObject("select 7\r\n",10);
1107 shared.select8 = createStringObject("select 8\r\n",10);
1108 shared.select9 = createStringObject("select 9\r\n",10);
1109 }
1110
1111 static void appendServerSaveParams(time_t seconds, int changes) {
1112 server.saveparams = zrealloc(server.saveparams,sizeof(struct saveparam)*(server.saveparamslen+1));
1113 server.saveparams[server.saveparamslen].seconds = seconds;
1114 server.saveparams[server.saveparamslen].changes = changes;
1115 server.saveparamslen++;
1116 }
1117
1118 static void resetServerSaveParams() {
1119 zfree(server.saveparams);
1120 server.saveparams = NULL;
1121 server.saveparamslen = 0;
1122 }
1123
1124 static void initServerConfig() {
1125 server.dbnum = REDIS_DEFAULT_DBNUM;
1126 server.port = REDIS_SERVERPORT;
1127 server.verbosity = REDIS_DEBUG;
1128 server.maxidletime = REDIS_MAXIDLETIME;
1129 server.saveparams = NULL;
1130 server.logfile = NULL; /* NULL = log on standard output */
1131 server.bindaddr = NULL;
1132 server.glueoutputbuf = 1;
1133 server.daemonize = 0;
1134 server.appendonly = 0;
1135 server.appendfsync = APPENDFSYNC_ALWAYS;
1136 server.lastfsync = time(NULL);
1137 server.appendfd = -1;
1138 server.appendseldb = -1; /* Make sure the first time will not match */
1139 server.pidfile = "/var/run/redis.pid";
1140 server.dbfilename = "dump.rdb";
1141 server.appendfilename = "appendonly.aof";
1142 server.requirepass = NULL;
1143 server.shareobjects = 0;
1144 server.sharingpoolsize = 1024;
1145 server.maxclients = 0;
1146 server.maxmemory = 0;
1147 resetServerSaveParams();
1148
1149 appendServerSaveParams(60*60,1); /* save after 1 hour and 1 change */
1150 appendServerSaveParams(300,100); /* save after 5 minutes and 100 changes */
1151 appendServerSaveParams(60,10000); /* save after 1 minute and 10000 changes */
1152 /* Replication related */
1153 server.isslave = 0;
1154 server.masterauth = NULL;
1155 server.masterhost = NULL;
1156 server.masterport = 6379;
1157 server.master = NULL;
1158 server.replstate = REDIS_REPL_NONE;
1159
1160 /* Double constants initialization */
1161 R_Zero = 0.0;
1162 R_PosInf = 1.0/R_Zero;
1163 R_NegInf = -1.0/R_Zero;
1164 R_Nan = R_Zero/R_Zero;
1165 }
1166
1167 static void initServer() {
1168 int j;
1169
1170 signal(SIGHUP, SIG_IGN);
1171 signal(SIGPIPE, SIG_IGN);
1172 setupSigSegvAction();
1173
1174 server.clients = listCreate();
1175 server.slaves = listCreate();
1176 server.monitors = listCreate();
1177 server.objfreelist = listCreate();
1178 createSharedObjects();
1179 server.el = aeCreateEventLoop();
1180 server.db = zmalloc(sizeof(redisDb)*server.dbnum);
1181 server.sharingpool = dictCreate(&setDictType,NULL);
1182 server.fd = anetTcpServer(server.neterr, server.port, server.bindaddr);
1183 if (server.fd == -1) {
1184 redisLog(REDIS_WARNING, "Opening TCP port: %s", server.neterr);
1185 exit(1);
1186 }
1187 for (j = 0; j < server.dbnum; j++) {
1188 server.db[j].dict = dictCreate(&hashDictType,NULL);
1189 server.db[j].expires = dictCreate(&setDictType,NULL);
1190 server.db[j].id = j;
1191 }
1192 server.cronloops = 0;
1193 server.bgsavechildpid = -1;
1194 server.bgrewritechildpid = -1;
1195 server.bgrewritebuf = sdsempty();
1196 server.lastsave = time(NULL);
1197 server.dirty = 0;
1198 server.usedmemory = 0;
1199 server.stat_numcommands = 0;
1200 server.stat_numconnections = 0;
1201 server.stat_starttime = time(NULL);
1202 aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL);
1203
1204 if (server.appendonly) {
1205 server.appendfd = open(server.appendfilename,O_WRONLY|O_APPEND|O_CREAT,0644);
1206 if (server.appendfd == -1) {
1207 redisLog(REDIS_WARNING, "Can't open the append-only file: %s",
1208 strerror(errno));
1209 exit(1);
1210 }
1211 }
1212 }
1213
1214 /* Empty the whole database */
1215 static long long emptyDb() {
1216 int j;
1217 long long removed = 0;
1218
1219 for (j = 0; j < server.dbnum; j++) {
1220 removed += dictSize(server.db[j].dict);
1221 dictEmpty(server.db[j].dict);
1222 dictEmpty(server.db[j].expires);
1223 }
1224 return removed;
1225 }
1226
1227 static int yesnotoi(char *s) {
1228 if (!strcasecmp(s,"yes")) return 1;
1229 else if (!strcasecmp(s,"no")) return 0;
1230 else return -1;
1231 }
1232
1233 /* I agree, this is a very rudimental way to load a configuration...
1234 will improve later if the config gets more complex */
1235 static void loadServerConfig(char *filename) {
1236 FILE *fp;
1237 char buf[REDIS_CONFIGLINE_MAX+1], *err = NULL;
1238 int linenum = 0;
1239 sds line = NULL;
1240
1241 if (filename[0] == '-' && filename[1] == '\0')
1242 fp = stdin;
1243 else {
1244 if ((fp = fopen(filename,"r")) == NULL) {
1245 redisLog(REDIS_WARNING,"Fatal error, can't open config file");
1246 exit(1);
1247 }
1248 }
1249
1250 while(fgets(buf,REDIS_CONFIGLINE_MAX+1,fp) != NULL) {
1251 sds *argv;
1252 int argc, j;
1253
1254 linenum++;
1255 line = sdsnew(buf);
1256 line = sdstrim(line," \t\r\n");
1257
1258 /* Skip comments and blank lines*/
1259 if (line[0] == '#' || line[0] == '\0') {
1260 sdsfree(line);
1261 continue;
1262 }
1263
1264 /* Split into arguments */
1265 argv = sdssplitlen(line,sdslen(line)," ",1,&argc);
1266 sdstolower(argv[0]);
1267
1268 /* Execute config directives */
1269 if (!strcasecmp(argv[0],"timeout") && argc == 2) {
1270 server.maxidletime = atoi(argv[1]);
1271 if (server.maxidletime < 0) {
1272 err = "Invalid timeout value"; goto loaderr;
1273 }
1274 } else if (!strcasecmp(argv[0],"port") && argc == 2) {
1275 server.port = atoi(argv[1]);
1276 if (server.port < 1 || server.port > 65535) {
1277 err = "Invalid port"; goto loaderr;
1278 }
1279 } else if (!strcasecmp(argv[0],"bind") && argc == 2) {
1280 server.bindaddr = zstrdup(argv[1]);
1281 } else if (!strcasecmp(argv[0],"save") && argc == 3) {
1282 int seconds = atoi(argv[1]);
1283 int changes = atoi(argv[2]);
1284 if (seconds < 1 || changes < 0) {
1285 err = "Invalid save parameters"; goto loaderr;
1286 }
1287 appendServerSaveParams(seconds,changes);
1288 } else if (!strcasecmp(argv[0],"dir") && argc == 2) {
1289 if (chdir(argv[1]) == -1) {
1290 redisLog(REDIS_WARNING,"Can't chdir to '%s': %s",
1291 argv[1], strerror(errno));
1292 exit(1);
1293 }
1294 } else if (!strcasecmp(argv[0],"loglevel") && argc == 2) {
1295 if (!strcasecmp(argv[1],"debug")) server.verbosity = REDIS_DEBUG;
1296 else if (!strcasecmp(argv[1],"notice")) server.verbosity = REDIS_NOTICE;
1297 else if (!strcasecmp(argv[1],"warning")) server.verbosity = REDIS_WARNING;
1298 else {
1299 err = "Invalid log level. Must be one of debug, notice, warning";
1300 goto loaderr;
1301 }
1302 } else if (!strcasecmp(argv[0],"logfile") && argc == 2) {
1303 FILE *logfp;
1304
1305 server.logfile = zstrdup(argv[1]);
1306 if (!strcasecmp(server.logfile,"stdout")) {
1307 zfree(server.logfile);
1308 server.logfile = NULL;
1309 }
1310 if (server.logfile) {
1311 /* Test if we are able to open the file. The server will not
1312 * be able to abort just for this problem later... */
1313 logfp = fopen(server.logfile,"a");
1314 if (logfp == NULL) {
1315 err = sdscatprintf(sdsempty(),
1316 "Can't open the log file: %s", strerror(errno));
1317 goto loaderr;
1318 }
1319 fclose(logfp);
1320 }
1321 } else if (!strcasecmp(argv[0],"databases") && argc == 2) {
1322 server.dbnum = atoi(argv[1]);
1323 if (server.dbnum < 1) {
1324 err = "Invalid number of databases"; goto loaderr;
1325 }
1326 } else if (!strcasecmp(argv[0],"maxclients") && argc == 2) {
1327 server.maxclients = atoi(argv[1]);
1328 } else if (!strcasecmp(argv[0],"maxmemory") && argc == 2) {
1329 server.maxmemory = strtoll(argv[1], NULL, 10);
1330 } else if (!strcasecmp(argv[0],"slaveof") && argc == 3) {
1331 server.masterhost = sdsnew(argv[1]);
1332 server.masterport = atoi(argv[2]);
1333 server.replstate = REDIS_REPL_CONNECT;
1334 } else if (!strcasecmp(argv[0],"masterauth") && argc == 2) {
1335 server.masterauth = zstrdup(argv[1]);
1336 } else if (!strcasecmp(argv[0],"glueoutputbuf") && argc == 2) {
1337 if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) {
1338 err = "argument must be 'yes' or 'no'"; goto loaderr;
1339 }
1340 } else if (!strcasecmp(argv[0],"shareobjects") && argc == 2) {
1341 if ((server.shareobjects = yesnotoi(argv[1])) == -1) {
1342 err = "argument must be 'yes' or 'no'"; goto loaderr;
1343 }
1344 } else if (!strcasecmp(argv[0],"shareobjectspoolsize") && argc == 2) {
1345 server.sharingpoolsize = atoi(argv[1]);
1346 if (server.sharingpoolsize < 1) {
1347 err = "invalid object sharing pool size"; goto loaderr;
1348 }
1349 } else if (!strcasecmp(argv[0],"daemonize") && argc == 2) {
1350 if ((server.daemonize = yesnotoi(argv[1])) == -1) {
1351 err = "argument must be 'yes' or 'no'"; goto loaderr;
1352 }
1353 } else if (!strcasecmp(argv[0],"appendonly") && argc == 2) {
1354 if ((server.appendonly = yesnotoi(argv[1])) == -1) {
1355 err = "argument must be 'yes' or 'no'"; goto loaderr;
1356 }
1357 } else if (!strcasecmp(argv[0],"appendfsync") && argc == 2) {
1358 if (!strcasecmp(argv[1],"no")) {
1359 server.appendfsync = APPENDFSYNC_NO;
1360 } else if (!strcasecmp(argv[1],"always")) {
1361 server.appendfsync = APPENDFSYNC_ALWAYS;
1362 } else if (!strcasecmp(argv[1],"everysec")) {
1363 server.appendfsync = APPENDFSYNC_EVERYSEC;
1364 } else {
1365 err = "argument must be 'no', 'always' or 'everysec'";
1366 goto loaderr;
1367 }
1368 } else if (!strcasecmp(argv[0],"requirepass") && argc == 2) {
1369 server.requirepass = zstrdup(argv[1]);
1370 } else if (!strcasecmp(argv[0],"pidfile") && argc == 2) {
1371 server.pidfile = zstrdup(argv[1]);
1372 } else if (!strcasecmp(argv[0],"dbfilename") && argc == 2) {
1373 server.dbfilename = zstrdup(argv[1]);
1374 } else {
1375 err = "Bad directive or wrong number of arguments"; goto loaderr;
1376 }
1377 for (j = 0; j < argc; j++)
1378 sdsfree(argv[j]);
1379 zfree(argv);
1380 sdsfree(line);
1381 }
1382 if (fp != stdin) fclose(fp);
1383 return;
1384
1385 loaderr:
1386 fprintf(stderr, "\n*** FATAL CONFIG FILE ERROR ***\n");
1387 fprintf(stderr, "Reading the configuration file, at line %d\n", linenum);
1388 fprintf(stderr, ">>> '%s'\n", line);
1389 fprintf(stderr, "%s\n", err);
1390 exit(1);
1391 }
1392
1393 static void freeClientArgv(redisClient *c) {
1394 int j;
1395
1396 for (j = 0; j < c->argc; j++)
1397 decrRefCount(c->argv[j]);
1398 for (j = 0; j < c->mbargc; j++)
1399 decrRefCount(c->mbargv[j]);
1400 c->argc = 0;
1401 c->mbargc = 0;
1402 }
1403
1404 static void freeClient(redisClient *c) {
1405 listNode *ln;
1406
1407 aeDeleteFileEvent(server.el,c->fd,AE_READABLE);
1408 aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
1409 sdsfree(c->querybuf);
1410 listRelease(c->reply);
1411 freeClientArgv(c);
1412 close(c->fd);
1413 ln = listSearchKey(server.clients,c);
1414 redisAssert(ln != NULL);
1415 listDelNode(server.clients,ln);
1416 if (c->flags & REDIS_SLAVE) {
1417 if (c->replstate == REDIS_REPL_SEND_BULK && c->repldbfd != -1)
1418 close(c->repldbfd);
1419 list *l = (c->flags & REDIS_MONITOR) ? server.monitors : server.slaves;
1420 ln = listSearchKey(l,c);
1421 redisAssert(ln != NULL);
1422 listDelNode(l,ln);
1423 }
1424 if (c->flags & REDIS_MASTER) {
1425 server.master = NULL;
1426 server.replstate = REDIS_REPL_CONNECT;
1427 }
1428 zfree(c->argv);
1429 zfree(c->mbargv);
1430 zfree(c);
1431 }
1432
1433 #define GLUEREPLY_UP_TO (1024)
1434 static void glueReplyBuffersIfNeeded(redisClient *c) {
1435 int copylen = 0;
1436 char buf[GLUEREPLY_UP_TO];
1437 listNode *ln;
1438 robj *o;
1439
1440 listRewind(c->reply);
1441 while((ln = listYield(c->reply))) {
1442 int objlen;
1443
1444 o = ln->value;
1445 objlen = sdslen(o->ptr);
1446 if (copylen + objlen <= GLUEREPLY_UP_TO) {
1447 memcpy(buf+copylen,o->ptr,objlen);
1448 copylen += objlen;
1449 listDelNode(c->reply,ln);
1450 } else {
1451 if (copylen == 0) return;
1452 break;
1453 }
1454 }
1455 /* Now the output buffer is empty, add the new single element */
1456 o = createObject(REDIS_STRING,sdsnewlen(buf,copylen));
1457 listAddNodeHead(c->reply,o);
1458 }
1459
1460 static void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
1461 redisClient *c = privdata;
1462 int nwritten = 0, totwritten = 0, objlen;
1463 robj *o;
1464 REDIS_NOTUSED(el);
1465 REDIS_NOTUSED(mask);
1466
1467 /* Use writev() if we have enough buffers to send */
1468 if (!server.glueoutputbuf &&
1469 listLength(c->reply) > REDIS_WRITEV_THRESHOLD &&
1470 !(c->flags & REDIS_MASTER))
1471 {
1472 sendReplyToClientWritev(el, fd, privdata, mask);
1473 return;
1474 }
1475
1476 while(listLength(c->reply)) {
1477 if (server.glueoutputbuf && listLength(c->reply) > 1)
1478 glueReplyBuffersIfNeeded(c);
1479
1480 o = listNodeValue(listFirst(c->reply));
1481 objlen = sdslen(o->ptr);
1482
1483 if (objlen == 0) {
1484 listDelNode(c->reply,listFirst(c->reply));
1485 continue;
1486 }
1487
1488 if (c->flags & REDIS_MASTER) {
1489 /* Don't reply to a master */
1490 nwritten = objlen - c->sentlen;
1491 } else {
1492 nwritten = write(fd, ((char*)o->ptr)+c->sentlen, objlen - c->sentlen);
1493 if (nwritten <= 0) break;
1494 }
1495 c->sentlen += nwritten;
1496 totwritten += nwritten;
1497 /* If we fully sent the object on head go to the next one */
1498 if (c->sentlen == objlen) {
1499 listDelNode(c->reply,listFirst(c->reply));
1500 c->sentlen = 0;
1501 }
1502 /* Note that we avoid to send more thank REDIS_MAX_WRITE_PER_EVENT
1503 * bytes, in a single threaded server it's a good idea to serve
1504 * other clients as well, even if a very large request comes from
1505 * super fast link that is always able to accept data (in real world
1506 * scenario think about 'KEYS *' against the loopback interfae) */
1507 if (totwritten > REDIS_MAX_WRITE_PER_EVENT) break;
1508 }
1509 if (nwritten == -1) {
1510 if (errno == EAGAIN) {
1511 nwritten = 0;
1512 } else {
1513 redisLog(REDIS_DEBUG,
1514 "Error writing to client: %s", strerror(errno));
1515 freeClient(c);
1516 return;
1517 }
1518 }
1519 if (totwritten > 0) c->lastinteraction = time(NULL);
1520 if (listLength(c->reply) == 0) {
1521 c->sentlen = 0;
1522 aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
1523 }
1524 }
1525
1526 static void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask)
1527 {
1528 redisClient *c = privdata;
1529 int nwritten = 0, totwritten = 0, objlen, willwrite;
1530 robj *o;
1531 struct iovec iov[REDIS_WRITEV_IOVEC_COUNT];
1532 int offset, ion = 0;
1533 REDIS_NOTUSED(el);
1534 REDIS_NOTUSED(mask);
1535
1536 listNode *node;
1537 while (listLength(c->reply)) {
1538 offset = c->sentlen;
1539 ion = 0;
1540 willwrite = 0;
1541
1542 /* fill-in the iov[] array */
1543 for(node = listFirst(c->reply); node; node = listNextNode(node)) {
1544 o = listNodeValue(node);
1545 objlen = sdslen(o->ptr);
1546
1547 if (totwritten + objlen - offset > REDIS_MAX_WRITE_PER_EVENT)
1548 break;
1549
1550 if(ion == REDIS_WRITEV_IOVEC_COUNT)
1551 break; /* no more iovecs */
1552
1553 iov[ion].iov_base = ((char*)o->ptr) + offset;
1554 iov[ion].iov_len = objlen - offset;
1555 willwrite += objlen - offset;
1556 offset = 0; /* just for the first item */
1557 ion++;
1558 }
1559
1560 if(willwrite == 0)
1561 break;
1562
1563 /* write all collected blocks at once */
1564 if((nwritten = writev(fd, iov, ion)) < 0) {
1565 if (errno != EAGAIN) {
1566 redisLog(REDIS_DEBUG,
1567 "Error writing to client: %s", strerror(errno));
1568 freeClient(c);
1569 return;
1570 }
1571 break;
1572 }
1573
1574 totwritten += nwritten;
1575 offset = c->sentlen;
1576
1577 /* remove written robjs from c->reply */
1578 while (nwritten && listLength(c->reply)) {
1579 o = listNodeValue(listFirst(c->reply));
1580 objlen = sdslen(o->ptr);
1581
1582 if(nwritten >= objlen - offset) {
1583 listDelNode(c->reply, listFirst(c->reply));
1584 nwritten -= objlen - offset;
1585 c->sentlen = 0;
1586 } else {
1587 /* partial write */
1588 c->sentlen += nwritten;
1589 break;
1590 }
1591 offset = 0;
1592 }
1593 }
1594
1595 if (totwritten > 0)
1596 c->lastinteraction = time(NULL);
1597
1598 if (listLength(c->reply) == 0) {
1599 c->sentlen = 0;
1600 aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
1601 }
1602 }
1603
1604 static struct redisCommand *lookupCommand(char *name) {
1605 int j = 0;
1606 while(cmdTable[j].name != NULL) {
1607 if (!strcasecmp(name,cmdTable[j].name)) return &cmdTable[j];
1608 j++;
1609 }
1610 return NULL;
1611 }
1612
1613 /* resetClient prepare the client to process the next command */
1614 static void resetClient(redisClient *c) {
1615 freeClientArgv(c);
1616 c->bulklen = -1;
1617 c->multibulk = 0;
1618 }
1619
1620 /* If this function gets called we already read a whole
1621 * command, argments are in the client argv/argc fields.
1622 * processCommand() execute the command or prepare the
1623 * server for a bulk read from the client.
1624 *
1625 * If 1 is returned the client is still alive and valid and
1626 * and other operations can be performed by the caller. Otherwise
1627 * if 0 is returned the client was destroied (i.e. after QUIT). */
1628 static int processCommand(redisClient *c) {
1629 struct redisCommand *cmd;
1630 long long dirty;
1631
1632 /* Free some memory if needed (maxmemory setting) */
1633 if (server.maxmemory) freeMemoryIfNeeded();
1634
1635 /* Handle the multi bulk command type. This is an alternative protocol
1636 * supported by Redis in order to receive commands that are composed of
1637 * multiple binary-safe "bulk" arguments. The latency of processing is
1638 * a bit higher but this allows things like multi-sets, so if this
1639 * protocol is used only for MSET and similar commands this is a big win. */
1640 if (c->multibulk == 0 && c->argc == 1 && ((char*)(c->argv[0]->ptr))[0] == '*') {
1641 c->multibulk = atoi(((char*)c->argv[0]->ptr)+1);
1642 if (c->multibulk <= 0) {
1643 resetClient(c);
1644 return 1;
1645 } else {
1646 decrRefCount(c->argv[c->argc-1]);
1647 c->argc--;
1648 return 1;
1649 }
1650 } else if (c->multibulk) {
1651 if (c->bulklen == -1) {
1652 if (((char*)c->argv[0]->ptr)[0] != '$') {
1653 addReplySds(c,sdsnew("-ERR multi bulk protocol error\r\n"));
1654 resetClient(c);
1655 return 1;
1656 } else {
1657 int bulklen = atoi(((char*)c->argv[0]->ptr)+1);
1658 decrRefCount(c->argv[0]);
1659 if (bulklen < 0 || bulklen > 1024*1024*1024) {
1660 c->argc--;
1661 addReplySds(c,sdsnew("-ERR invalid bulk write count\r\n"));
1662 resetClient(c);
1663 return 1;
1664 }
1665 c->argc--;
1666 c->bulklen = bulklen+2; /* add two bytes for CR+LF */
1667 return 1;
1668 }
1669 } else {
1670 c->mbargv = zrealloc(c->mbargv,(sizeof(robj*))*(c->mbargc+1));
1671 c->mbargv[c->mbargc] = c->argv[0];
1672 c->mbargc++;
1673 c->argc--;
1674 c->multibulk--;
1675 if (c->multibulk == 0) {
1676 robj **auxargv;
1677 int auxargc;
1678
1679 /* Here we need to swap the multi-bulk argc/argv with the
1680 * normal argc/argv of the client structure. */
1681 auxargv = c->argv;
1682 c->argv = c->mbargv;
1683 c->mbargv = auxargv;
1684
1685 auxargc = c->argc;
1686 c->argc = c->mbargc;
1687 c->mbargc = auxargc;
1688
1689 /* We need to set bulklen to something different than -1
1690 * in order for the code below to process the command without
1691 * to try to read the last argument of a bulk command as
1692 * a special argument. */
1693 c->bulklen = 0;
1694 /* continue below and process the command */
1695 } else {
1696 c->bulklen = -1;
1697 return 1;
1698 }
1699 }
1700 }
1701 /* -- end of multi bulk commands processing -- */
1702
1703 /* The QUIT command is handled as a special case. Normal command
1704 * procs are unable to close the client connection safely */
1705 if (!strcasecmp(c->argv[0]->ptr,"quit")) {
1706 freeClient(c);
1707 return 0;
1708 }
1709 cmd = lookupCommand(c->argv[0]->ptr);
1710 if (!cmd) {
1711 addReplySds(c,sdsnew("-ERR unknown command\r\n"));
1712 resetClient(c);
1713 return 1;
1714 } else if ((cmd->arity > 0 && cmd->arity != c->argc) ||
1715 (c->argc < -cmd->arity)) {
1716 addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
1717 resetClient(c);
1718 return 1;
1719 } else if (server.maxmemory && cmd->flags & REDIS_CMD_DENYOOM && zmalloc_used_memory() > server.maxmemory) {
1720 addReplySds(c,sdsnew("-ERR command not allowed when used memory > 'maxmemory'\r\n"));
1721 resetClient(c);
1722 return 1;
1723 } else if (cmd->flags & REDIS_CMD_BULK && c->bulklen == -1) {
1724 int bulklen = atoi(c->argv[c->argc-1]->ptr);
1725
1726 decrRefCount(c->argv[c->argc-1]);
1727 if (bulklen < 0 || bulklen > 1024*1024*1024) {
1728 c->argc--;
1729 addReplySds(c,sdsnew("-ERR invalid bulk write count\r\n"));
1730 resetClient(c);
1731 return 1;
1732 }
1733 c->argc--;
1734 c->bulklen = bulklen+2; /* add two bytes for CR+LF */
1735 /* It is possible that the bulk read is already in the
1736 * buffer. Check this condition and handle it accordingly.
1737 * This is just a fast path, alternative to call processInputBuffer().
1738 * It's a good idea since the code is small and this condition
1739 * happens most of the times. */
1740 if ((signed)sdslen(c->querybuf) >= c->bulklen) {
1741 c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
1742 c->argc++;
1743 c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
1744 } else {
1745 return 1;
1746 }
1747 }
1748 /* Let's try to share objects on the command arguments vector */
1749 if (server.shareobjects) {
1750 int j;
1751 for(j = 1; j < c->argc; j++)
1752 c->argv[j] = tryObjectSharing(c->argv[j]);
1753 }
1754 /* Let's try to encode the bulk object to save space. */
1755 if (cmd->flags & REDIS_CMD_BULK)
1756 tryObjectEncoding(c->argv[c->argc-1]);
1757
1758 /* Check if the user is authenticated */
1759 if (server.requirepass && !c->authenticated && cmd->proc != authCommand) {
1760 addReplySds(c,sdsnew("-ERR operation not permitted\r\n"));
1761 resetClient(c);
1762 return 1;
1763 }
1764
1765 /* Exec the command */
1766 dirty = server.dirty;
1767 cmd->proc(c);
1768 if (server.appendonly && server.dirty-dirty)
1769 feedAppendOnlyFile(cmd,c->db->id,c->argv,c->argc);
1770 if (server.dirty-dirty && listLength(server.slaves))
1771 replicationFeedSlaves(server.slaves,cmd,c->db->id,c->argv,c->argc);
1772 if (listLength(server.monitors))
1773 replicationFeedSlaves(server.monitors,cmd,c->db->id,c->argv,c->argc);
1774 server.stat_numcommands++;
1775
1776 /* Prepare the client for the next command */
1777 if (c->flags & REDIS_CLOSE) {
1778 freeClient(c);
1779 return 0;
1780 }
1781 resetClient(c);
1782 return 1;
1783 }
1784
1785 static void replicationFeedSlaves(list *slaves, struct redisCommand *cmd, int dictid, robj **argv, int argc) {
1786 listNode *ln;
1787 int outc = 0, j;
1788 robj **outv;
1789 /* (args*2)+1 is enough room for args, spaces, newlines */
1790 robj *static_outv[REDIS_STATIC_ARGS*2+1];
1791
1792 if (argc <= REDIS_STATIC_ARGS) {
1793 outv = static_outv;
1794 } else {
1795 outv = zmalloc(sizeof(robj*)*(argc*2+1));
1796 }
1797
1798 for (j = 0; j < argc; j++) {
1799 if (j != 0) outv[outc++] = shared.space;
1800 if ((cmd->flags & REDIS_CMD_BULK) && j == argc-1) {
1801 robj *lenobj;
1802
1803 lenobj = createObject(REDIS_STRING,
1804 sdscatprintf(sdsempty(),"%lu\r\n",
1805 (unsigned long) stringObjectLen(argv[j])));
1806 lenobj->refcount = 0;
1807 outv[outc++] = lenobj;
1808 }
1809 outv[outc++] = argv[j];
1810 }
1811 outv[outc++] = shared.crlf;
1812
1813 /* Increment all the refcounts at start and decrement at end in order to
1814 * be sure to free objects if there is no slave in a replication state
1815 * able to be feed with commands */
1816 for (j = 0; j < outc; j++) incrRefCount(outv[j]);
1817 listRewind(slaves);
1818 while((ln = listYield(slaves))) {
1819 redisClient *slave = ln->value;
1820
1821 /* Don't feed slaves that are still waiting for BGSAVE to start */
1822 if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) continue;
1823
1824 /* Feed all the other slaves, MONITORs and so on */
1825 if (slave->slaveseldb != dictid) {
1826 robj *selectcmd;
1827
1828 switch(dictid) {
1829 case 0: selectcmd = shared.select0; break;
1830 case 1: selectcmd = shared.select1; break;
1831 case 2: selectcmd = shared.select2; break;
1832 case 3: selectcmd = shared.select3; break;
1833 case 4: selectcmd = shared.select4; break;
1834 case 5: selectcmd = shared.select5; break;
1835 case 6: selectcmd = shared.select6; break;
1836 case 7: selectcmd = shared.select7; break;
1837 case 8: selectcmd = shared.select8; break;
1838 case 9: selectcmd = shared.select9; break;
1839 default:
1840 selectcmd = createObject(REDIS_STRING,
1841 sdscatprintf(sdsempty(),"select %d\r\n",dictid));
1842 selectcmd->refcount = 0;
1843 break;
1844 }
1845 addReply(slave,selectcmd);
1846 slave->slaveseldb = dictid;
1847 }
1848 for (j = 0; j < outc; j++) addReply(slave,outv[j]);
1849 }
1850 for (j = 0; j < outc; j++) decrRefCount(outv[j]);
1851 if (outv != static_outv) zfree(outv);
1852 }
1853
1854 static void processInputBuffer(redisClient *c) {
1855 again:
1856 if (c->bulklen == -1) {
1857 /* Read the first line of the query */
1858 char *p = strchr(c->querybuf,'\n');
1859 size_t querylen;
1860
1861 if (p) {
1862 sds query, *argv;
1863 int argc, j;
1864
1865 query = c->querybuf;
1866 c->querybuf = sdsempty();
1867 querylen = 1+(p-(query));
1868 if (sdslen(query) > querylen) {
1869 /* leave data after the first line of the query in the buffer */
1870 c->querybuf = sdscatlen(c->querybuf,query+querylen,sdslen(query)-querylen);
1871 }
1872 *p = '\0'; /* remove "\n" */
1873 if (*(p-1) == '\r') *(p-1) = '\0'; /* and "\r" if any */
1874 sdsupdatelen(query);
1875
1876 /* Now we can split the query in arguments */
1877 if (sdslen(query) == 0) {
1878 /* Ignore empty query */
1879 sdsfree(query);
1880 return;
1881 }
1882 argv = sdssplitlen(query,sdslen(query)," ",1,&argc);
1883 sdsfree(query);
1884
1885 if (c->argv) zfree(c->argv);
1886 c->argv = zmalloc(sizeof(robj*)*argc);
1887
1888 for (j = 0; j < argc; j++) {
1889 if (sdslen(argv[j])) {
1890 c->argv[c->argc] = createObject(REDIS_STRING,argv[j]);
1891 c->argc++;
1892 } else {
1893 sdsfree(argv[j]);
1894 }
1895 }
1896 zfree(argv);
1897 /* Execute the command. If the client is still valid
1898 * after processCommand() return and there is something
1899 * on the query buffer try to process the next command. */
1900 if (c->argc && processCommand(c) && sdslen(c->querybuf)) goto again;
1901 return;
1902 } else if (sdslen(c->querybuf) >= REDIS_REQUEST_MAX_SIZE) {
1903 redisLog(REDIS_DEBUG, "Client protocol error");
1904 freeClient(c);
1905 return;
1906 }
1907 } else {
1908 /* Bulk read handling. Note that if we are at this point
1909 the client already sent a command terminated with a newline,
1910 we are reading the bulk data that is actually the last
1911 argument of the command. */
1912 int qbl = sdslen(c->querybuf);
1913
1914 if (c->bulklen <= qbl) {
1915 /* Copy everything but the final CRLF as final argument */
1916 c->argv[c->argc] = createStringObject(c->querybuf,c->bulklen-2);
1917 c->argc++;
1918 c->querybuf = sdsrange(c->querybuf,c->bulklen,-1);
1919 /* Process the command. If the client is still valid after
1920 * the processing and there is more data in the buffer
1921 * try to parse it. */
1922 if (processCommand(c) && sdslen(c->querybuf)) goto again;
1923 return;
1924 }
1925 }
1926 }
1927
1928 static void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask) {
1929 redisClient *c = (redisClient*) privdata;
1930 char buf[REDIS_IOBUF_LEN];
1931 int nread;
1932 REDIS_NOTUSED(el);
1933 REDIS_NOTUSED(mask);
1934
1935 nread = read(fd, buf, REDIS_IOBUF_LEN);
1936 if (nread == -1) {
1937 if (errno == EAGAIN) {
1938 nread = 0;
1939 } else {
1940 redisLog(REDIS_DEBUG, "Reading from client: %s",strerror(errno));
1941 freeClient(c);
1942 return;
1943 }
1944 } else if (nread == 0) {
1945 redisLog(REDIS_DEBUG, "Client closed connection");
1946 freeClient(c);
1947 return;
1948 }
1949 if (nread) {
1950 c->querybuf = sdscatlen(c->querybuf, buf, nread);
1951 c->lastinteraction = time(NULL);
1952 } else {
1953 return;
1954 }
1955 processInputBuffer(c);
1956 }
1957
1958 static int selectDb(redisClient *c, int id) {
1959 if (id < 0 || id >= server.dbnum)
1960 return REDIS_ERR;
1961 c->db = &server.db[id];
1962 return REDIS_OK;
1963 }
1964
1965 static void *dupClientReplyValue(void *o) {
1966 incrRefCount((robj*)o);
1967 return 0;
1968 }
1969
1970 static redisClient *createClient(int fd) {
1971 redisClient *c = zmalloc(sizeof(*c));
1972
1973 anetNonBlock(NULL,fd);
1974 anetTcpNoDelay(NULL,fd);
1975 if (!c) return NULL;
1976 selectDb(c,0);
1977 c->fd = fd;
1978 c->querybuf = sdsempty();
1979 c->argc = 0;
1980 c->argv = NULL;
1981 c->bulklen = -1;
1982 c->multibulk = 0;
1983 c->mbargc = 0;
1984 c->mbargv = NULL;
1985 c->sentlen = 0;
1986 c->flags = 0;
1987 c->lastinteraction = time(NULL);
1988 c->authenticated = 0;
1989 c->replstate = REDIS_REPL_NONE;
1990 c->reply = listCreate();
1991 listSetFreeMethod(c->reply,decrRefCount);
1992 listSetDupMethod(c->reply,dupClientReplyValue);
1993 if (aeCreateFileEvent(server.el, c->fd, AE_READABLE,
1994 readQueryFromClient, c) == AE_ERR) {
1995 freeClient(c);
1996 return NULL;
1997 }
1998 listAddNodeTail(server.clients,c);
1999 return c;
2000 }
2001
2002 static void addReply(redisClient *c, robj *obj) {
2003 if (listLength(c->reply) == 0 &&
2004 (c->replstate == REDIS_REPL_NONE ||
2005 c->replstate == REDIS_REPL_ONLINE) &&
2006 aeCreateFileEvent(server.el, c->fd, AE_WRITABLE,
2007 sendReplyToClient, c) == AE_ERR) return;
2008 listAddNodeTail(c->reply,getDecodedObject(obj));
2009 }
2010
2011 static void addReplySds(redisClient *c, sds s) {
2012 robj *o = createObject(REDIS_STRING,s);
2013 addReply(c,o);
2014 decrRefCount(o);
2015 }
2016
2017 static void addReplyDouble(redisClient *c, double d) {
2018 char buf[128];
2019
2020 snprintf(buf,sizeof(buf),"%.17g",d);
2021 addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n%s\r\n",
2022 (unsigned long) strlen(buf),buf));
2023 }
2024
2025 static void addReplyBulkLen(redisClient *c, robj *obj) {
2026 size_t len;
2027
2028 if (obj->encoding == REDIS_ENCODING_RAW) {
2029 len = sdslen(obj->ptr);
2030 } else {
2031 long n = (long)obj->ptr;
2032
2033 len = 1;
2034 if (n < 0) {
2035 len++;
2036 n = -n;
2037 }
2038 while((n = n/10) != 0) {
2039 len++;
2040 }
2041 }
2042 addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",(unsigned long)len));
2043 }
2044
2045 static void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask) {
2046 int cport, cfd;
2047 char cip[128];
2048 redisClient *c;
2049 REDIS_NOTUSED(el);
2050 REDIS_NOTUSED(mask);
2051 REDIS_NOTUSED(privdata);
2052
2053 cfd = anetAccept(server.neterr, fd, cip, &cport);
2054 if (cfd == AE_ERR) {
2055 redisLog(REDIS_DEBUG,"Accepting client connection: %s", server.neterr);
2056 return;
2057 }
2058 redisLog(REDIS_DEBUG,"Accepted %s:%d", cip, cport);
2059 if ((c = createClient(cfd)) == NULL) {
2060 redisLog(REDIS_WARNING,"Error allocating resoures for the client");
2061 close(cfd); /* May be already closed, just ingore errors */
2062 return;
2063 }
2064 /* If maxclient directive is set and this is one client more... close the
2065 * connection. Note that we create the client instead to check before
2066 * for this condition, since now the socket is already set in nonblocking
2067 * mode and we can send an error for free using the Kernel I/O */
2068 if (server.maxclients && listLength(server.clients) > server.maxclients) {
2069 char *err = "-ERR max number of clients reached\r\n";
2070
2071 /* That's a best effort error message, don't check write errors */
2072 if (write(c->fd,err,strlen(err)) == -1) {
2073 /* Nothing to do, Just to avoid the warning... */
2074 }
2075 freeClient(c);
2076 return;
2077 }
2078 server.stat_numconnections++;
2079 }
2080
2081 /* ======================= Redis objects implementation ===================== */
2082
2083 static robj *createObject(int type, void *ptr) {
2084 robj *o;
2085
2086 if (listLength(server.objfreelist)) {
2087 listNode *head = listFirst(server.objfreelist);
2088 o = listNodeValue(head);
2089 listDelNode(server.objfreelist,head);
2090 } else {
2091 o = zmalloc(sizeof(*o));
2092 }
2093 o->type = type;
2094 o->encoding = REDIS_ENCODING_RAW;
2095 o->ptr = ptr;
2096 o->refcount = 1;
2097 return o;
2098 }
2099
2100 static robj *createStringObject(char *ptr, size_t len) {
2101 return createObject(REDIS_STRING,sdsnewlen(ptr,len));
2102 }
2103
2104 static robj *createListObject(void) {
2105 list *l = listCreate();
2106
2107 listSetFreeMethod(l,decrRefCount);
2108 return createObject(REDIS_LIST,l);
2109 }
2110
2111 static robj *createSetObject(void) {
2112 dict *d = dictCreate(&setDictType,NULL);
2113 return createObject(REDIS_SET,d);
2114 }
2115
2116 static robj *createZsetObject(void) {
2117 zset *zs = zmalloc(sizeof(*zs));
2118
2119 zs->dict = dictCreate(&zsetDictType,NULL);
2120 zs->zsl = zslCreate();
2121 return createObject(REDIS_ZSET,zs);
2122 }
2123
2124 static void freeStringObject(robj *o) {
2125 if (o->encoding == REDIS_ENCODING_RAW) {
2126 sdsfree(o->ptr);
2127 }
2128 }
2129
2130 static void freeListObject(robj *o) {
2131 listRelease((list*) o->ptr);
2132 }
2133
2134 static void freeSetObject(robj *o) {
2135 dictRelease((dict*) o->ptr);
2136 }
2137
2138 static void freeZsetObject(robj *o) {
2139 zset *zs = o->ptr;
2140
2141 dictRelease(zs->dict);
2142 zslFree(zs->zsl);
2143 zfree(zs);
2144 }
2145
2146 static void freeHashObject(robj *o) {
2147 dictRelease((dict*) o->ptr);
2148 }
2149
2150 static void incrRefCount(robj *o) {
2151 o->refcount++;
2152 #ifdef DEBUG_REFCOUNT
2153 if (o->type == REDIS_STRING)
2154 printf("Increment '%s'(%p), now is: %d\n",o->ptr,o,o->refcount);
2155 #endif
2156 }
2157
2158 static void decrRefCount(void *obj) {
2159 robj *o = obj;
2160
2161 #ifdef DEBUG_REFCOUNT
2162 if (o->type == REDIS_STRING)
2163 printf("Decrement '%s'(%p), now is: %d\n",o->ptr,o,o->refcount-1);
2164 #endif
2165 if (--(o->refcount) == 0) {
2166 switch(o->type) {
2167 case REDIS_STRING: freeStringObject(o); break;
2168 case REDIS_LIST: freeListObject(o); break;
2169 case REDIS_SET: freeSetObject(o); break;
2170 case REDIS_ZSET: freeZsetObject(o); break;
2171 case REDIS_HASH: freeHashObject(o); break;
2172 default: redisAssert(0 != 0); break;
2173 }
2174 if (listLength(server.objfreelist) > REDIS_OBJFREELIST_MAX ||
2175 !listAddNodeHead(server.objfreelist,o))
2176 zfree(o);
2177 }
2178 }
2179
2180 static robj *lookupKey(redisDb *db, robj *key) {
2181 dictEntry *de = dictFind(db->dict,key);
2182 return de ? dictGetEntryVal(de) : NULL;
2183 }
2184
2185 static robj *lookupKeyRead(redisDb *db, robj *key) {
2186 expireIfNeeded(db,key);
2187 return lookupKey(db,key);
2188 }
2189
2190 static robj *lookupKeyWrite(redisDb *db, robj *key) {
2191 deleteIfVolatile(db,key);
2192 return lookupKey(db,key);
2193 }
2194
2195 static int deleteKey(redisDb *db, robj *key) {
2196 int retval;
2197
2198 /* We need to protect key from destruction: after the first dictDelete()
2199 * it may happen that 'key' is no longer valid if we don't increment
2200 * it's count. This may happen when we get the object reference directly
2201 * from the hash table with dictRandomKey() or dict iterators */
2202 incrRefCount(key);
2203 if (dictSize(db->expires)) dictDelete(db->expires,key);
2204 retval = dictDelete(db->dict,key);
2205 decrRefCount(key);
2206
2207 return retval == DICT_OK;
2208 }
2209
2210 /* Try to share an object against the shared objects pool */
2211 static robj *tryObjectSharing(robj *o) {
2212 struct dictEntry *de;
2213 unsigned long c;
2214
2215 if (o == NULL || server.shareobjects == 0) return o;
2216
2217 redisAssert(o->type == REDIS_STRING);
2218 de = dictFind(server.sharingpool,o);
2219 if (de) {
2220 robj *shared = dictGetEntryKey(de);
2221
2222 c = ((unsigned long) dictGetEntryVal(de))+1;
2223 dictGetEntryVal(de) = (void*) c;
2224 incrRefCount(shared);
2225 decrRefCount(o);
2226 return shared;
2227 } else {
2228 /* Here we are using a stream algorihtm: Every time an object is
2229 * shared we increment its count, everytime there is a miss we
2230 * recrement the counter of a random object. If this object reaches
2231 * zero we remove the object and put the current object instead. */
2232 if (dictSize(server.sharingpool) >=
2233 server.sharingpoolsize) {
2234 de = dictGetRandomKey(server.sharingpool);
2235 redisAssert(de != NULL);
2236 c = ((unsigned long) dictGetEntryVal(de))-1;
2237 dictGetEntryVal(de) = (void*) c;
2238 if (c == 0) {
2239 dictDelete(server.sharingpool,de->key);
2240 }
2241 } else {
2242 c = 0; /* If the pool is empty we want to add this object */
2243 }
2244 if (c == 0) {
2245 int retval;
2246
2247 retval = dictAdd(server.sharingpool,o,(void*)1);
2248 redisAssert(retval == DICT_OK);
2249 incrRefCount(o);
2250 }
2251 return o;
2252 }
2253 }
2254
2255 /* Check if the nul-terminated string 's' can be represented by a long
2256 * (that is, is a number that fits into long without any other space or
2257 * character before or after the digits).
2258 *
2259 * If so, the function returns REDIS_OK and *longval is set to the value
2260 * of the number. Otherwise REDIS_ERR is returned */
2261 static int isStringRepresentableAsLong(sds s, long *longval) {
2262 char buf[32], *endptr;
2263 long value;
2264 int slen;
2265
2266 value = strtol(s, &endptr, 10);
2267 if (endptr[0] != '\0') return REDIS_ERR;
2268 slen = snprintf(buf,32,"%ld",value);
2269
2270 /* If the number converted back into a string is not identical
2271 * then it's not possible to encode the string as integer */
2272 if (sdslen(s) != (unsigned)slen || memcmp(buf,s,slen)) return REDIS_ERR;
2273 if (longval) *longval = value;
2274 return REDIS_OK;
2275 }
2276
2277 /* Try to encode a string object in order to save space */
2278 static int tryObjectEncoding(robj *o) {
2279 long value;
2280 sds s = o->ptr;
2281
2282 if (o->encoding != REDIS_ENCODING_RAW)
2283 return REDIS_ERR; /* Already encoded */
2284
2285 /* It's not save to encode shared objects: shared objects can be shared
2286 * everywhere in the "object space" of Redis. Encoded objects can only
2287 * appear as "values" (and not, for instance, as keys) */
2288 if (o->refcount > 1) return REDIS_ERR;
2289
2290 /* Currently we try to encode only strings */
2291 redisAssert(o->type == REDIS_STRING);
2292
2293 /* Check if we can represent this string as a long integer */
2294 if (isStringRepresentableAsLong(s,&value) == REDIS_ERR) return REDIS_ERR;
2295
2296 /* Ok, this object can be encoded */
2297 o->encoding = REDIS_ENCODING_INT;
2298 sdsfree(o->ptr);
2299 o->ptr = (void*) value;
2300 return REDIS_OK;
2301 }
2302
2303 /* Get a decoded version of an encoded object (returned as a new object).
2304 * If the object is already raw-encoded just increment the ref count. */
2305 static robj *getDecodedObject(robj *o) {
2306 robj *dec;
2307
2308 if (o->encoding == REDIS_ENCODING_RAW) {
2309 incrRefCount(o);
2310 return o;
2311 }
2312 if (o->type == REDIS_STRING && o->encoding == REDIS_ENCODING_INT) {
2313 char buf[32];
2314
2315 snprintf(buf,32,"%ld",(long)o->ptr);
2316 dec = createStringObject(buf,strlen(buf));
2317 return dec;
2318 } else {
2319 redisAssert(1 != 1);
2320 }
2321 }
2322
2323 /* Compare two string objects via strcmp() or alike.
2324 * Note that the objects may be integer-encoded. In such a case we
2325 * use snprintf() to get a string representation of the numbers on the stack
2326 * and compare the strings, it's much faster than calling getDecodedObject().
2327 *
2328 * Important note: if objects are not integer encoded, but binary-safe strings,
2329 * sdscmp() from sds.c will apply memcmp() so this function ca be considered
2330 * binary safe. */
2331 static int compareStringObjects(robj *a, robj *b) {
2332 redisAssert(a->type == REDIS_STRING && b->type == REDIS_STRING);
2333 char bufa[128], bufb[128], *astr, *bstr;
2334 int bothsds = 1;
2335
2336 if (a == b) return 0;
2337 if (a->encoding != REDIS_ENCODING_RAW) {
2338 snprintf(bufa,sizeof(bufa),"%ld",(long) a->ptr);
2339 astr = bufa;
2340 bothsds = 0;
2341 } else {
2342 astr = a->ptr;
2343 }
2344 if (b->encoding != REDIS_ENCODING_RAW) {
2345 snprintf(bufb,sizeof(bufb),"%ld",(long) b->ptr);
2346 bstr = bufb;
2347 bothsds = 0;
2348 } else {
2349 bstr = b->ptr;
2350 }
2351 return bothsds ? sdscmp(astr,bstr) : strcmp(astr,bstr);
2352 }
2353
2354 static size_t stringObjectLen(robj *o) {
2355 redisAssert(o->type == REDIS_STRING);
2356 if (o->encoding == REDIS_ENCODING_RAW) {
2357 return sdslen(o->ptr);
2358 } else {
2359 char buf[32];
2360
2361 return snprintf(buf,32,"%ld",(long)o->ptr);
2362 }
2363 }
2364
2365 /*============================ DB saving/loading ============================ */
2366
2367 static int rdbSaveType(FILE *fp, unsigned char type) {
2368 if (fwrite(&type,1,1,fp) == 0) return -1;
2369 return 0;
2370 }
2371
2372 static int rdbSaveTime(FILE *fp, time_t t) {
2373 int32_t t32 = (int32_t) t;
2374 if (fwrite(&t32,4,1,fp) == 0) return -1;
2375 return 0;
2376 }
2377
2378 /* check rdbLoadLen() comments for more info */
2379 static int rdbSaveLen(FILE *fp, uint32_t len) {
2380 unsigned char buf[2];
2381
2382 if (len < (1<<6)) {
2383 /* Save a 6 bit len */
2384 buf[0] = (len&0xFF)|(REDIS_RDB_6BITLEN<<6);
2385 if (fwrite(buf,1,1,fp) == 0) return -1;
2386 } else if (len < (1<<14)) {
2387 /* Save a 14 bit len */
2388 buf[0] = ((len>>8)&0xFF)|(REDIS_RDB_14BITLEN<<6);
2389 buf[1] = len&0xFF;
2390 if (fwrite(buf,2,1,fp) == 0) return -1;
2391 } else {
2392 /* Save a 32 bit len */
2393 buf[0] = (REDIS_RDB_32BITLEN<<6);
2394 if (fwrite(buf,1,1,fp) == 0) return -1;
2395 len = htonl(len);
2396 if (fwrite(&len,4,1,fp) == 0) return -1;
2397 }
2398 return 0;
2399 }
2400
2401 /* String objects in the form "2391" "-100" without any space and with a
2402 * range of values that can fit in an 8, 16 or 32 bit signed value can be
2403 * encoded as integers to save space */
2404 static int rdbTryIntegerEncoding(sds s, unsigned char *enc) {
2405 long long value;
2406 char *endptr, buf[32];
2407
2408 /* Check if it's possible to encode this value as a number */
2409 value = strtoll(s, &endptr, 10);
2410 if (endptr[0] != '\0') return 0;
2411 snprintf(buf,32,"%lld",value);
2412
2413 /* If the number converted back into a string is not identical
2414 * then it's not possible to encode the string as integer */
2415 if (strlen(buf) != sdslen(s) || memcmp(buf,s,sdslen(s))) return 0;
2416
2417 /* Finally check if it fits in our ranges */
2418 if (value >= -(1<<7) && value <= (1<<7)-1) {
2419 enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT8;
2420 enc[1] = value&0xFF;
2421 return 2;
2422 } else if (value >= -(1<<15) && value <= (1<<15)-1) {
2423 enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT16;
2424 enc[1] = value&0xFF;
2425 enc[2] = (value>>8)&0xFF;
2426 return 3;
2427 } else if (value >= -((long long)1<<31) && value <= ((long long)1<<31)-1) {
2428 enc[0] = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_INT32;
2429 enc[1] = value&0xFF;
2430 enc[2] = (value>>8)&0xFF;
2431 enc[3] = (value>>16)&0xFF;
2432 enc[4] = (value>>24)&0xFF;
2433 return 5;
2434 } else {
2435 return 0;
2436 }
2437 }
2438
2439 static int rdbSaveLzfStringObject(FILE *fp, robj *obj) {
2440 unsigned int comprlen, outlen;
2441 unsigned char byte;
2442 void *out;
2443
2444 /* We require at least four bytes compression for this to be worth it */
2445 outlen = sdslen(obj->ptr)-4;
2446 if (outlen <= 0) return 0;
2447 if ((out = zmalloc(outlen+1)) == NULL) return 0;
2448 comprlen = lzf_compress(obj->ptr, sdslen(obj->ptr), out, outlen);
2449 if (comprlen == 0) {
2450 zfree(out);
2451 return 0;
2452 }
2453 /* Data compressed! Let's save it on disk */
2454 byte = (REDIS_RDB_ENCVAL<<6)|REDIS_RDB_ENC_LZF;
2455 if (fwrite(&byte,1,1,fp) == 0) goto writeerr;
2456 if (rdbSaveLen(fp,comprlen) == -1) goto writeerr;
2457 if (rdbSaveLen(fp,sdslen(obj->ptr)) == -1) goto writeerr;
2458 if (fwrite(out,comprlen,1,fp) == 0) goto writeerr;
2459 zfree(out);
2460 return comprlen;
2461
2462 writeerr:
2463 zfree(out);
2464 return -1;
2465 }
2466
2467 /* Save a string objet as [len][data] on disk. If the object is a string
2468 * representation of an integer value we try to safe it in a special form */
2469 static int rdbSaveStringObjectRaw(FILE *fp, robj *obj) {
2470 size_t len;
2471 int enclen;
2472
2473 len = sdslen(obj->ptr);
2474
2475 /* Try integer encoding */
2476 if (len <= 11) {
2477 unsigned char buf[5];
2478 if ((enclen = rdbTryIntegerEncoding(obj->ptr,buf)) > 0) {
2479 if (fwrite(buf,enclen,1,fp) == 0) return -1;
2480 return 0;
2481 }
2482 }
2483
2484 /* Try LZF compression - under 20 bytes it's unable to compress even
2485 * aaaaaaaaaaaaaaaaaa so skip it */
2486 if (len > 20) {
2487 int retval;
2488
2489 retval = rdbSaveLzfStringObject(fp,obj);
2490 if (retval == -1) return -1;
2491 if (retval > 0) return 0;
2492 /* retval == 0 means data can't be compressed, save the old way */
2493 }
2494
2495 /* Store verbatim */
2496 if (rdbSaveLen(fp,len) == -1) return -1;
2497 if (len && fwrite(obj->ptr,len,1,fp) == 0) return -1;
2498 return 0;
2499 }
2500
2501 /* Like rdbSaveStringObjectRaw() but handle encoded objects */
2502 static int rdbSaveStringObject(FILE *fp, robj *obj) {
2503 int retval;
2504
2505 obj = getDecodedObject(obj);
2506 retval = rdbSaveStringObjectRaw(fp,obj);
2507 decrRefCount(obj);
2508 return retval;
2509 }
2510
2511 /* Save a double value. Doubles are saved as strings prefixed by an unsigned
2512 * 8 bit integer specifing the length of the representation.
2513 * This 8 bit integer has special values in order to specify the following
2514 * conditions:
2515 * 253: not a number
2516 * 254: + inf
2517 * 255: - inf
2518 */
2519 static int rdbSaveDoubleValue(FILE *fp, double val) {
2520 unsigned char buf[128];
2521 int len;
2522
2523 if (isnan(val)) {
2524 buf[0] = 253;
2525 len = 1;
2526 } else if (!isfinite(val)) {
2527 len = 1;
2528 buf[0] = (val < 0) ? 255 : 254;
2529 } else {
2530 snprintf((char*)buf+1,sizeof(buf)-1,"%.17g",val);
2531 buf[0] = strlen((char*)buf+1);
2532 len = buf[0]+1;
2533 }
2534 if (fwrite(buf,len,1,fp) == 0) return -1;
2535 return 0;
2536 }
2537
2538 /* Save the DB on disk. Return REDIS_ERR on error, REDIS_OK on success */
2539 static int rdbSave(char *filename) {
2540 dictIterator *di = NULL;
2541 dictEntry *de;
2542 FILE *fp;
2543 char tmpfile[256];
2544 int j;
2545 time_t now = time(NULL);
2546
2547 snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
2548 fp = fopen(tmpfile,"w");
2549 if (!fp) {
2550 redisLog(REDIS_WARNING, "Failed saving the DB: %s", strerror(errno));
2551 return REDIS_ERR;
2552 }
2553 if (fwrite("REDIS0001",9,1,fp) == 0) goto werr;
2554 for (j = 0; j < server.dbnum; j++) {
2555 redisDb *db = server.db+j;
2556 dict *d = db->dict;
2557 if (dictSize(d) == 0) continue;
2558 di = dictGetIterator(d);
2559 if (!di) {
2560 fclose(fp);
2561 return REDIS_ERR;
2562 }
2563
2564 /* Write the SELECT DB opcode */
2565 if (rdbSaveType(fp,REDIS_SELECTDB) == -1) goto werr;
2566 if (rdbSaveLen(fp,j) == -1) goto werr;
2567
2568 /* Iterate this DB writing every entry */
2569 while((de = dictNext(di)) != NULL) {
2570 robj *key = dictGetEntryKey(de);
2571 robj *o = dictGetEntryVal(de);
2572 time_t expiretime = getExpire(db,key);
2573
2574 /* Save the expire time */
2575 if (expiretime != -1) {
2576 /* If this key is already expired skip it */
2577 if (expiretime < now) continue;
2578 if (rdbSaveType(fp,REDIS_EXPIRETIME) == -1) goto werr;
2579 if (rdbSaveTime(fp,expiretime) == -1) goto werr;
2580 }
2581 /* Save the key and associated value */
2582 if (rdbSaveType(fp,o->type) == -1) goto werr;
2583 if (rdbSaveStringObject(fp,key) == -1) goto werr;
2584 if (o->type == REDIS_STRING) {
2585 /* Save a string value */
2586 if (rdbSaveStringObject(fp,o) == -1) goto werr;
2587 } else if (o->type == REDIS_LIST) {
2588 /* Save a list value */
2589 list *list = o->ptr;
2590 listNode *ln;
2591
2592 listRewind(list);
2593 if (rdbSaveLen(fp,listLength(list)) == -1) goto werr;
2594 while((ln = listYield(list))) {
2595 robj *eleobj = listNodeValue(ln);
2596
2597 if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
2598 }
2599 } else if (o->type == REDIS_SET) {
2600 /* Save a set value */
2601 dict *set = o->ptr;
2602 dictIterator *di = dictGetIterator(set);
2603 dictEntry *de;
2604
2605 if (rdbSaveLen(fp,dictSize(set)) == -1) goto werr;
2606 while((de = dictNext(di)) != NULL) {
2607 robj *eleobj = dictGetEntryKey(de);
2608
2609 if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
2610 }
2611 dictReleaseIterator(di);
2612 } else if (o->type == REDIS_ZSET) {
2613 /* Save a set value */
2614 zset *zs = o->ptr;
2615 dictIterator *di = dictGetIterator(zs->dict);
2616 dictEntry *de;
2617
2618 if (rdbSaveLen(fp,dictSize(zs->dict)) == -1) goto werr;
2619 while((de = dictNext(di)) != NULL) {
2620 robj *eleobj = dictGetEntryKey(de);
2621 double *score = dictGetEntryVal(de);
2622
2623 if (rdbSaveStringObject(fp,eleobj) == -1) goto werr;
2624 if (rdbSaveDoubleValue(fp,*score) == -1) goto werr;
2625 }
2626 dictReleaseIterator(di);
2627 } else {
2628 redisAssert(0 != 0);
2629 }
2630 }
2631 dictReleaseIterator(di);
2632 }
2633 /* EOF opcode */
2634 if (rdbSaveType(fp,REDIS_EOF) == -1) goto werr;
2635
2636 /* Make sure data will not remain on the OS's output buffers */
2637 fflush(fp);
2638 fsync(fileno(fp));
2639 fclose(fp);
2640
2641 /* Use RENAME to make sure the DB file is changed atomically only
2642 * if the generate DB file is ok. */
2643 if (rename(tmpfile,filename) == -1) {
2644 redisLog(REDIS_WARNING,"Error moving temp DB file on the final destination: %s", strerror(errno));
2645 unlink(tmpfile);
2646 return REDIS_ERR;
2647 }
2648 redisLog(REDIS_NOTICE,"DB saved on disk");
2649 server.dirty = 0;
2650 server.lastsave = time(NULL);
2651 return REDIS_OK;
2652
2653 werr:
2654 fclose(fp);
2655 unlink(tmpfile);
2656 redisLog(REDIS_WARNING,"Write error saving DB on disk: %s", strerror(errno));
2657 if (di) dictReleaseIterator(di);
2658 return REDIS_ERR;
2659 }
2660
2661 static int rdbSaveBackground(char *filename) {
2662 pid_t childpid;
2663
2664 if (server.bgsavechildpid != -1) return REDIS_ERR;
2665 if ((childpid = fork()) == 0) {
2666 /* Child */
2667 close(server.fd);
2668 if (rdbSave(filename) == REDIS_OK) {
2669 exit(0);
2670 } else {
2671 exit(1);
2672 }
2673 } else {
2674 /* Parent */
2675 if (childpid == -1) {
2676 redisLog(REDIS_WARNING,"Can't save in background: fork: %s",
2677 strerror(errno));
2678 return REDIS_ERR;
2679 }
2680 redisLog(REDIS_NOTICE,"Background saving started by pid %d",childpid);
2681 server.bgsavechildpid = childpid;
2682 return REDIS_OK;
2683 }
2684 return REDIS_OK; /* unreached */
2685 }
2686
2687 static void rdbRemoveTempFile(pid_t childpid) {
2688 char tmpfile[256];
2689
2690 snprintf(tmpfile,256,"temp-%d.rdb", (int) childpid);
2691 unlink(tmpfile);
2692 }
2693
2694 static int rdbLoadType(FILE *fp) {
2695 unsigned char type;
2696 if (fread(&type,1,1,fp) == 0) return -1;
2697 return type;
2698 }
2699
2700 static time_t rdbLoadTime(FILE *fp) {
2701 int32_t t32;
2702 if (fread(&t32,4,1,fp) == 0) return -1;
2703 return (time_t) t32;
2704 }
2705
2706 /* Load an encoded length from the DB, see the REDIS_RDB_* defines on the top
2707 * of this file for a description of how this are stored on disk.
2708 *
2709 * isencoded is set to 1 if the readed length is not actually a length but
2710 * an "encoding type", check the above comments for more info */
2711 static uint32_t rdbLoadLen(FILE *fp, int rdbver, int *isencoded) {
2712 unsigned char buf[2];
2713 uint32_t len;
2714
2715 if (isencoded) *isencoded = 0;
2716 if (rdbver == 0) {
2717 if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
2718 return ntohl(len);
2719 } else {
2720 int type;
2721
2722 if (fread(buf,1,1,fp) == 0) return REDIS_RDB_LENERR;
2723 type = (buf[0]&0xC0)>>6;
2724 if (type == REDIS_RDB_6BITLEN) {
2725 /* Read a 6 bit len */
2726 return buf[0]&0x3F;
2727 } else if (type == REDIS_RDB_ENCVAL) {
2728 /* Read a 6 bit len encoding type */
2729 if (isencoded) *isencoded = 1;
2730 return buf[0]&0x3F;
2731 } else if (type == REDIS_RDB_14BITLEN) {
2732 /* Read a 14 bit len */
2733 if (fread(buf+1,1,1,fp) == 0) return REDIS_RDB_LENERR;
2734 return ((buf[0]&0x3F)<<8)|buf[1];
2735 } else {
2736 /* Read a 32 bit len */
2737 if (fread(&len,4,1,fp) == 0) return REDIS_RDB_LENERR;
2738 return ntohl(len);
2739 }
2740 }
2741 }
2742
2743 static robj *rdbLoadIntegerObject(FILE *fp, int enctype) {
2744 unsigned char enc[4];
2745 long long val;
2746
2747 if (enctype == REDIS_RDB_ENC_INT8) {
2748 if (fread(enc,1,1,fp) == 0) return NULL;
2749 val = (signed char)enc[0];
2750 } else if (enctype == REDIS_RDB_ENC_INT16) {
2751 uint16_t v;
2752 if (fread(enc,2,1,fp) == 0) return NULL;
2753 v = enc[0]|(enc[1]<<8);
2754 val = (int16_t)v;
2755 } else if (enctype == REDIS_RDB_ENC_INT32) {
2756 uint32_t v;
2757 if (fread(enc,4,1,fp) == 0) return NULL;
2758 v = enc[0]|(enc[1]<<8)|(enc[2]<<16)|(enc[3]<<24);
2759 val = (int32_t)v;
2760 } else {
2761 val = 0; /* anti-warning */
2762 redisAssert(0!=0);
2763 }
2764 return createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",val));
2765 }
2766
2767 static robj *rdbLoadLzfStringObject(FILE*fp, int rdbver) {
2768 unsigned int len, clen;
2769 unsigned char *c = NULL;
2770 sds val = NULL;
2771
2772 if ((clen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL;
2773 if ((len = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR) return NULL;
2774 if ((c = zmalloc(clen)) == NULL) goto err;
2775 if ((val = sdsnewlen(NULL,len)) == NULL) goto err;
2776 if (fread(c,clen,1,fp) == 0) goto err;
2777 if (lzf_decompress(c,clen,val,len) == 0) goto err;
2778 zfree(c);
2779 return createObject(REDIS_STRING,val);
2780 err:
2781 zfree(c);
2782 sdsfree(val);
2783 return NULL;
2784 }
2785
2786 static robj *rdbLoadStringObject(FILE*fp, int rdbver) {
2787 int isencoded;
2788 uint32_t len;
2789 sds val;
2790
2791 len = rdbLoadLen(fp,rdbver,&isencoded);
2792 if (isencoded) {
2793 switch(len) {
2794 case REDIS_RDB_ENC_INT8:
2795 case REDIS_RDB_ENC_INT16:
2796 case REDIS_RDB_ENC_INT32:
2797 return tryObjectSharing(rdbLoadIntegerObject(fp,len));
2798 case REDIS_RDB_ENC_LZF:
2799 return tryObjectSharing(rdbLoadLzfStringObject(fp,rdbver));
2800 default:
2801 redisAssert(0!=0);
2802 }
2803 }
2804
2805 if (len == REDIS_RDB_LENERR) return NULL;
2806 val = sdsnewlen(NULL,len);
2807 if (len && fread(val,len,1,fp) == 0) {
2808 sdsfree(val);
2809 return NULL;
2810 }
2811 return tryObjectSharing(createObject(REDIS_STRING,val));
2812 }
2813
2814 /* For information about double serialization check rdbSaveDoubleValue() */
2815 static int rdbLoadDoubleValue(FILE *fp, double *val) {
2816 char buf[128];
2817 unsigned char len;
2818
2819 if (fread(&len,1,1,fp) == 0) return -1;
2820 switch(len) {
2821 case 255: *val = R_NegInf; return 0;
2822 case 254: *val = R_PosInf; return 0;
2823 case 253: *val = R_Nan; return 0;
2824 default:
2825 if (fread(buf,len,1,fp) == 0) return -1;
2826 buf[len] = '\0';
2827 sscanf(buf, "%lg", val);
2828 return 0;
2829 }
2830 }
2831
2832 static int rdbLoad(char *filename) {
2833 FILE *fp;
2834 robj *keyobj = NULL;
2835 uint32_t dbid;
2836 int type, retval, rdbver;
2837 dict *d = server.db[0].dict;
2838 redisDb *db = server.db+0;
2839 char buf[1024];
2840 time_t expiretime = -1, now = time(NULL);
2841
2842 fp = fopen(filename,"r");
2843 if (!fp) return REDIS_ERR;
2844 if (fread(buf,9,1,fp) == 0) goto eoferr;
2845 buf[9] = '\0';
2846 if (memcmp(buf,"REDIS",5) != 0) {
2847 fclose(fp);
2848 redisLog(REDIS_WARNING,"Wrong signature trying to load DB from file");
2849 return REDIS_ERR;
2850 }
2851 rdbver = atoi(buf+5);
2852 if (rdbver > 1) {
2853 fclose(fp);
2854 redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
2855 return REDIS_ERR;
2856 }
2857 while(1) {
2858 robj *o;
2859
2860 /* Read type. */
2861 if ((type = rdbLoadType(fp)) == -1) goto eoferr;
2862 if (type == REDIS_EXPIRETIME) {
2863 if ((expiretime = rdbLoadTime(fp)) == -1) goto eoferr;
2864 /* We read the time so we need to read the object type again */
2865 if ((type = rdbLoadType(fp)) == -1) goto eoferr;
2866 }
2867 if (type == REDIS_EOF) break;
2868 /* Handle SELECT DB opcode as a special case */
2869 if (type == REDIS_SELECTDB) {
2870 if ((dbid = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
2871 goto eoferr;
2872 if (dbid >= (unsigned)server.dbnum) {
2873 redisLog(REDIS_WARNING,"FATAL: Data file was created with a Redis server configured to handle more than %d databases. Exiting\n", server.dbnum);
2874 exit(1);
2875 }
2876 db = server.db+dbid;
2877 d = db->dict;
2878 continue;
2879 }
2880 /* Read key */
2881 if ((keyobj = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
2882
2883 if (type == REDIS_STRING) {
2884 /* Read string value */
2885 if ((o = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
2886 tryObjectEncoding(o);
2887 } else if (type == REDIS_LIST || type == REDIS_SET) {
2888 /* Read list/set value */
2889 uint32_t listlen;
2890
2891 if ((listlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
2892 goto eoferr;
2893 o = (type == REDIS_LIST) ? createListObject() : createSetObject();
2894 /* Load every single element of the list/set */
2895 while(listlen--) {
2896 robj *ele;
2897
2898 if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
2899 tryObjectEncoding(ele);
2900 if (type == REDIS_LIST) {
2901 listAddNodeTail((list*)o->ptr,ele);
2902 } else {
2903 dictAdd((dict*)o->ptr,ele,NULL);
2904 }
2905 }
2906 } else if (type == REDIS_ZSET) {
2907 /* Read list/set value */
2908 uint32_t zsetlen;
2909 zset *zs;
2910
2911 if ((zsetlen = rdbLoadLen(fp,rdbver,NULL)) == REDIS_RDB_LENERR)
2912 goto eoferr;
2913 o = createZsetObject();
2914 zs = o->ptr;
2915 /* Load every single element of the list/set */
2916 while(zsetlen--) {
2917 robj *ele;
2918 double *score = zmalloc(sizeof(double));
2919
2920 if ((ele = rdbLoadStringObject(fp,rdbver)) == NULL) goto eoferr;
2921 tryObjectEncoding(ele);
2922 if (rdbLoadDoubleValue(fp,score) == -1) goto eoferr;
2923 dictAdd(zs->dict,ele,score);
2924 zslInsert(zs->zsl,*score,ele);
2925 incrRefCount(ele); /* added to skiplist */
2926 }
2927 } else {
2928 redisAssert(0 != 0);
2929 }
2930 /* Add the new object in the hash table */
2931 retval = dictAdd(d,keyobj,o);
2932 if (retval == DICT_ERR) {
2933 redisLog(REDIS_WARNING,"Loading DB, duplicated key (%s) found! Unrecoverable error, exiting now.", keyobj->ptr);
2934 exit(1);
2935 }
2936 /* Set the expire time if needed */
2937 if (expiretime != -1) {
2938 setExpire(db,keyobj,expiretime);
2939 /* Delete this key if already expired */
2940 if (expiretime < now) deleteKey(db,keyobj);
2941 expiretime = -1;
2942 }
2943 keyobj = o = NULL;
2944 }
2945 fclose(fp);
2946 return REDIS_OK;
2947
2948 eoferr: /* unexpected end of file is handled here with a fatal exit */
2949 if (keyobj) decrRefCount(keyobj);
2950 redisLog(REDIS_WARNING,"Short read or OOM loading DB. Unrecoverable error, aborting now.");
2951 exit(1);
2952 return REDIS_ERR; /* Just to avoid warning */
2953 }
2954
2955 /*================================== Commands =============================== */
2956
2957 static void authCommand(redisClient *c) {
2958 if (!server.requirepass || !strcmp(c->argv[1]->ptr, server.requirepass)) {
2959 c->authenticated = 1;
2960 addReply(c,shared.ok);
2961 } else {
2962 c->authenticated = 0;
2963 addReplySds(c,sdscatprintf(sdsempty(),"-ERR invalid password\r\n"));
2964 }
2965 }
2966
2967 static void pingCommand(redisClient *c) {
2968 addReply(c,shared.pong);
2969 }
2970
2971 static void echoCommand(redisClient *c) {
2972 addReplyBulkLen(c,c->argv[1]);
2973 addReply(c,c->argv[1]);
2974 addReply(c,shared.crlf);
2975 }
2976
2977 /*=================================== Strings =============================== */
2978
2979 static void setGenericCommand(redisClient *c, int nx) {
2980 int retval;
2981
2982 if (nx) deleteIfVolatile(c->db,c->argv[1]);
2983 retval = dictAdd(c->db->dict,c->argv[1],c->argv[2]);
2984 if (retval == DICT_ERR) {
2985 if (!nx) {
2986 dictReplace(c->db->dict,c->argv[1],c->argv[2]);
2987 incrRefCount(c->argv[2]);
2988 } else {
2989 addReply(c,shared.czero);
2990 return;
2991 }
2992 } else {
2993 incrRefCount(c->argv[1]);
2994 incrRefCount(c->argv[2]);
2995 }
2996 server.dirty++;
2997 removeExpire(c->db,c->argv[1]);
2998 addReply(c, nx ? shared.cone : shared.ok);
2999 }
3000
3001 static void setCommand(redisClient *c) {
3002 setGenericCommand(c,0);
3003 }
3004
3005 static void setnxCommand(redisClient *c) {
3006 setGenericCommand(c,1);
3007 }
3008
3009 static void getCommand(redisClient *c) {
3010 robj *o = lookupKeyRead(c->db,c->argv[1]);
3011
3012 if (o == NULL) {
3013 addReply(c,shared.nullbulk);
3014 } else {
3015 if (o->type != REDIS_STRING) {
3016 addReply(c,shared.wrongtypeerr);
3017 } else {
3018 addReplyBulkLen(c,o);
3019 addReply(c,o);
3020 addReply(c,shared.crlf);
3021 }
3022 }
3023 }
3024
3025 static void getsetCommand(redisClient *c) {
3026 getCommand(c);
3027 if (dictAdd(c->db->dict,c->argv[1],c->argv[2]) == DICT_ERR) {
3028 dictReplace(c->db->dict,c->argv[1],c->argv[2]);
3029 } else {
3030 incrRefCount(c->argv[1]);
3031 }
3032 incrRefCount(c->argv[2]);
3033 server.dirty++;
3034 removeExpire(c->db,c->argv[1]);
3035 }
3036
3037 static void mgetCommand(redisClient *c) {
3038 int j;
3039
3040 addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",c->argc-1));
3041 for (j = 1; j < c->argc; j++) {
3042 robj *o = lookupKeyRead(c->db,c->argv[j]);
3043 if (o == NULL) {
3044 addReply(c,shared.nullbulk);
3045 } else {
3046 if (o->type != REDIS_STRING) {
3047 addReply(c,shared.nullbulk);
3048 } else {
3049 addReplyBulkLen(c,o);
3050 addReply(c,o);
3051 addReply(c,shared.crlf);
3052 }
3053 }
3054 }
3055 }
3056
3057 static void msetGenericCommand(redisClient *c, int nx) {
3058 int j, busykeys = 0;
3059
3060 if ((c->argc % 2) == 0) {
3061 addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
3062 return;
3063 }
3064 /* Handle the NX flag. The MSETNX semantic is to return zero and don't
3065 * set nothing at all if at least one already key exists. */
3066 if (nx) {
3067 for (j = 1; j < c->argc; j += 2) {
3068 if (lookupKeyWrite(c->db,c->argv[j]) != NULL) {
3069 busykeys++;
3070 }
3071 }
3072 }
3073 if (busykeys) {
3074 addReply(c, shared.czero);
3075 return;
3076 }
3077
3078 for (j = 1; j < c->argc; j += 2) {
3079 int retval;
3080
3081 tryObjectEncoding(c->argv[j+1]);
3082 retval = dictAdd(c->db->dict,c->argv[j],c->argv[j+1]);
3083 if (retval == DICT_ERR) {
3084 dictReplace(c->db->dict,c->argv[j],c->argv[j+1]);
3085 incrRefCount(c->argv[j+1]);
3086 } else {
3087 incrRefCount(c->argv[j]);
3088 incrRefCount(c->argv[j+1]);
3089 }
3090 removeExpire(c->db,c->argv[j]);
3091 }
3092 server.dirty += (c->argc-1)/2;
3093 addReply(c, nx ? shared.cone : shared.ok);
3094 }
3095
3096 static void msetCommand(redisClient *c) {
3097 msetGenericCommand(c,0);
3098 }
3099
3100 static void msetnxCommand(redisClient *c) {
3101 msetGenericCommand(c,1);
3102 }
3103
3104 static void incrDecrCommand(redisClient *c, long long incr) {
3105 long long value;
3106 int retval;
3107 robj *o;
3108
3109 o = lookupKeyWrite(c->db,c->argv[1]);
3110 if (o == NULL) {
3111 value = 0;
3112 } else {
3113 if (o->type != REDIS_STRING) {
3114 value = 0;
3115 } else {
3116 char *eptr;
3117
3118 if (o->encoding == REDIS_ENCODING_RAW)
3119 value = strtoll(o->ptr, &eptr, 10);
3120 else if (o->encoding == REDIS_ENCODING_INT)
3121 value = (long)o->ptr;
3122 else
3123 redisAssert(1 != 1);
3124 }
3125 }
3126
3127 value += incr;
3128 o = createObject(REDIS_STRING,sdscatprintf(sdsempty(),"%lld",value));
3129 tryObjectEncoding(o);
3130 retval = dictAdd(c->db->dict,c->argv[1],o);
3131 if (retval == DICT_ERR) {
3132 dictReplace(c->db->dict,c->argv[1],o);
3133 removeExpire(c->db,c->argv[1]);
3134 } else {
3135 incrRefCount(c->argv[1]);
3136 }
3137 server.dirty++;
3138 addReply(c,shared.colon);
3139 addReply(c,o);
3140 addReply(c,shared.crlf);
3141 }
3142
3143 static void incrCommand(redisClient *c) {
3144 incrDecrCommand(c,1);
3145 }
3146
3147 static void decrCommand(redisClient *c) {
3148 incrDecrCommand(c,-1);
3149 }
3150
3151 static void incrbyCommand(redisClient *c) {
3152 long long incr = strtoll(c->argv[2]->ptr, NULL, 10);
3153 incrDecrCommand(c,incr);
3154 }
3155
3156 static void decrbyCommand(redisClient *c) {
3157 long long incr = strtoll(c->argv[2]->ptr, NULL, 10);
3158 incrDecrCommand(c,-incr);
3159 }
3160
3161 /* ========================= Type agnostic commands ========================= */
3162
3163 static void delCommand(redisClient *c) {
3164 int deleted = 0, j;
3165
3166 for (j = 1; j < c->argc; j++) {
3167 if (deleteKey(c->db,c->argv[j])) {
3168 server.dirty++;
3169 deleted++;
3170 }
3171 }
3172 switch(deleted) {
3173 case 0:
3174 addReply(c,shared.czero);
3175 break;
3176 case 1:
3177 addReply(c,shared.cone);
3178 break;
3179 default:
3180 addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",deleted));
3181 break;
3182 }
3183 }
3184
3185 static void existsCommand(redisClient *c) {
3186 addReply(c,lookupKeyRead(c->db,c->argv[1]) ? shared.cone : shared.czero);
3187 }
3188
3189 static void selectCommand(redisClient *c) {
3190 int id = atoi(c->argv[1]->ptr);
3191
3192 if (selectDb(c,id) == REDIS_ERR) {
3193 addReplySds(c,sdsnew("-ERR invalid DB index\r\n"));
3194 } else {
3195 addReply(c,shared.ok);
3196 }
3197 }
3198
3199 static void randomkeyCommand(redisClient *c) {
3200 dictEntry *de;
3201
3202 while(1) {
3203 de = dictGetRandomKey(c->db->dict);
3204 if (!de || expireIfNeeded(c->db,dictGetEntryKey(de)) == 0) break;
3205 }
3206 if (de == NULL) {
3207 addReply(c,shared.plus);
3208 addReply(c,shared.crlf);
3209 } else {
3210 addReply(c,shared.plus);
3211 addReply(c,dictGetEntryKey(de));
3212 addReply(c,shared.crlf);
3213 }
3214 }
3215
3216 static void keysCommand(redisClient *c) {
3217 dictIterator *di;
3218 dictEntry *de;
3219 sds pattern = c->argv[1]->ptr;
3220 int plen = sdslen(pattern);
3221 unsigned long numkeys = 0, keyslen = 0;
3222 robj *lenobj = createObject(REDIS_STRING,NULL);
3223
3224 di = dictGetIterator(c->db->dict);
3225 addReply(c,lenobj);
3226 decrRefCount(lenobj);
3227 while((de = dictNext(di)) != NULL) {
3228 robj *keyobj = dictGetEntryKey(de);
3229
3230 sds key = keyobj->ptr;
3231 if ((pattern[0] == '*' && pattern[1] == '\0') ||
3232 stringmatchlen(pattern,plen,key,sdslen(key),0)) {
3233 if (expireIfNeeded(c->db,keyobj) == 0) {
3234 if (numkeys != 0)
3235 addReply(c,shared.space);
3236 addReply(c,keyobj);
3237 numkeys++;
3238 keyslen += sdslen(key);
3239 }
3240 }
3241 }
3242 dictReleaseIterator(di);
3243 lenobj->ptr = sdscatprintf(sdsempty(),"$%lu\r\n",keyslen+(numkeys ? (numkeys-1) : 0));
3244 addReply(c,shared.crlf);
3245 }
3246
3247 static void dbsizeCommand(redisClient *c) {
3248 addReplySds(c,
3249 sdscatprintf(sdsempty(),":%lu\r\n",dictSize(c->db->dict)));
3250 }
3251
3252 static void lastsaveCommand(redisClient *c) {
3253 addReplySds(c,
3254 sdscatprintf(sdsempty(),":%lu\r\n",server.lastsave));
3255 }
3256
3257 static void typeCommand(redisClient *c) {
3258 robj *o;
3259 char *type;
3260
3261 o = lookupKeyRead(c->db,c->argv[1]);
3262 if (o == NULL) {
3263 type = "+none";
3264 } else {
3265 switch(o->type) {
3266 case REDIS_STRING: type = "+string"; break;
3267 case REDIS_LIST: type = "+list"; break;
3268 case REDIS_SET: type = "+set"; break;
3269 case REDIS_ZSET: type = "+zset"; break;
3270 default: type = "unknown"; break;
3271 }
3272 }
3273 addReplySds(c,sdsnew(type));
3274 addReply(c,shared.crlf);
3275 }
3276
3277 static void saveCommand(redisClient *c) {
3278 if (server.bgsavechildpid != -1) {
3279 addReplySds(c,sdsnew("-ERR background save in progress\r\n"));
3280 return;
3281 }
3282 if (rdbSave(server.dbfilename) == REDIS_OK) {
3283 addReply(c,shared.ok);
3284 } else {
3285 addReply(c,shared.err);
3286 }
3287 }
3288
3289 static void bgsaveCommand(redisClient *c) {
3290 if (server.bgsavechildpid != -1) {
3291 addReplySds(c,sdsnew("-ERR background save already in progress\r\n"));
3292 return;
3293 }
3294 if (rdbSaveBackground(server.dbfilename) == REDIS_OK) {
3295 addReply(c,shared.ok);
3296 } else {
3297 addReply(c,shared.err);
3298 }
3299 }
3300
3301 static void shutdownCommand(redisClient *c) {
3302 redisLog(REDIS_WARNING,"User requested shutdown, saving DB...");
3303 /* Kill the saving child if there is a background saving in progress.
3304 We want to avoid race conditions, for instance our saving child may
3305 overwrite the synchronous saving did by SHUTDOWN. */
3306 if (server.bgsavechildpid != -1) {
3307 redisLog(REDIS_WARNING,"There is a live saving child. Killing it!");
3308 kill(server.bgsavechildpid,SIGKILL);
3309 rdbRemoveTempFile(server.bgsavechildpid);
3310 }
3311 /* SYNC SAVE */
3312 if (rdbSave(server.dbfilename) == REDIS_OK) {
3313 if (server.daemonize)
3314 unlink(server.pidfile);
3315 redisLog(REDIS_WARNING,"%zu bytes used at exit",zmalloc_used_memory());
3316 redisLog(REDIS_WARNING,"Server exit now, bye bye...");
3317 exit(1);
3318 } else {
3319 /* Ooops.. error saving! The best we can do is to continue operating.
3320 * Note that if there was a background saving process, in the next
3321 * cron() Redis will be notified that the background saving aborted,
3322 * handling special stuff like slaves pending for synchronization... */
3323 redisLog(REDIS_WARNING,"Error trying to save the DB, can't exit");
3324 addReplySds(c,sdsnew("-ERR can't quit, problems saving the DB\r\n"));
3325 }
3326 }
3327
3328 static void renameGenericCommand(redisClient *c, int nx) {
3329 robj *o;
3330
3331 /* To use the same key as src and dst is probably an error */
3332 if (sdscmp(c->argv[1]->ptr,c->argv[2]->ptr) == 0) {
3333 addReply(c,shared.sameobjecterr);
3334 return;
3335 }
3336
3337 o = lookupKeyWrite(c->db,c->argv[1]);
3338 if (o == NULL) {
3339 addReply(c,shared.nokeyerr);
3340 return;
3341 }
3342 incrRefCount(o);
3343 deleteIfVolatile(c->db,c->argv[2]);
3344 if (dictAdd(c->db->dict,c->argv[2],o) == DICT_ERR) {
3345 if (nx) {
3346 decrRefCount(o);
3347 addReply(c,shared.czero);
3348 return;
3349 }
3350 dictReplace(c->db->dict,c->argv[2],o);
3351 } else {
3352 incrRefCount(c->argv[2]);
3353 }
3354 deleteKey(c->db,c->argv[1]);
3355 server.dirty++;
3356 addReply(c,nx ? shared.cone : shared.ok);
3357 }
3358
3359 static void renameCommand(redisClient *c) {
3360 renameGenericCommand(c,0);
3361 }
3362
3363 static void renamenxCommand(redisClient *c) {
3364 renameGenericCommand(c,1);
3365 }
3366
3367 static void moveCommand(redisClient *c) {
3368 robj *o;
3369 redisDb *src, *dst;
3370 int srcid;
3371
3372 /* Obtain source and target DB pointers */
3373 src = c->db;
3374 srcid = c->db->id;
3375 if (selectDb(c,atoi(c->argv[2]->ptr)) == REDIS_ERR) {
3376 addReply(c,shared.outofrangeerr);
3377 return;
3378 }
3379 dst = c->db;
3380 selectDb(c,srcid); /* Back to the source DB */
3381
3382 /* If the user is moving using as target the same
3383 * DB as the source DB it is probably an error. */
3384 if (src == dst) {
3385 addReply(c,shared.sameobjecterr);
3386 return;
3387 }
3388
3389 /* Check if the element exists and get a reference */
3390 o = lookupKeyWrite(c->db,c->argv[1]);
3391 if (!o) {
3392 addReply(c,shared.czero);
3393 return;
3394 }
3395
3396 /* Try to add the element to the target DB */
3397 deleteIfVolatile(dst,c->argv[1]);
3398 if (dictAdd(dst->dict,c->argv[1],o) == DICT_ERR) {
3399 addReply(c,shared.czero);
3400 return;
3401 }
3402 incrRefCount(c->argv[1]);
3403 incrRefCount(o);
3404
3405 /* OK! key moved, free the entry in the source DB */
3406 deleteKey(src,c->argv[1]);
3407 server.dirty++;
3408 addReply(c,shared.cone);
3409 }
3410
3411 /* =================================== Lists ================================ */
3412 static void pushGenericCommand(redisClient *c, int where) {
3413 robj *lobj;
3414 list *list;
3415
3416 lobj = lookupKeyWrite(c->db,c->argv[1]);
3417 if (lobj == NULL) {
3418 lobj = createListObject();
3419 list = lobj->ptr;
3420 if (where == REDIS_HEAD) {
3421 listAddNodeHead(list,c->argv[2]);
3422 } else {
3423 listAddNodeTail(list,c->argv[2]);
3424 }
3425 dictAdd(c->db->dict,c->argv[1],lobj);
3426 incrRefCount(c->argv[1]);
3427 incrRefCount(c->argv[2]);
3428 } else {
3429 if (lobj->type != REDIS_LIST) {
3430 addReply(c,shared.wrongtypeerr);
3431 return;
3432 }
3433 list = lobj->ptr;
3434 if (where == REDIS_HEAD) {
3435 listAddNodeHead(list,c->argv[2]);
3436 } else {
3437 listAddNodeTail(list,c->argv[2]);
3438 }
3439 incrRefCount(c->argv[2]);
3440 }
3441 server.dirty++;
3442 addReply(c,shared.ok);
3443 }
3444
3445 static void lpushCommand(redisClient *c) {
3446 pushGenericCommand(c,REDIS_HEAD);
3447 }
3448
3449 static void rpushCommand(redisClient *c) {
3450 pushGenericCommand(c,REDIS_TAIL);
3451 }
3452
3453 static void llenCommand(redisClient *c) {
3454 robj *o;
3455 list *l;
3456
3457 o = lookupKeyRead(c->db,c->argv[1]);
3458 if (o == NULL) {
3459 addReply(c,shared.czero);
3460 return;
3461 } else {
3462 if (o->type != REDIS_LIST) {
3463 addReply(c,shared.wrongtypeerr);
3464 } else {
3465 l = o->ptr;
3466 addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",listLength(l)));
3467 }
3468 }
3469 }
3470
3471 static void lindexCommand(redisClient *c) {
3472 robj *o;
3473 int index = atoi(c->argv[2]->ptr);
3474
3475 o = lookupKeyRead(c->db,c->argv[1]);
3476 if (o == NULL) {
3477 addReply(c,shared.nullbulk);
3478 } else {
3479 if (o->type != REDIS_LIST) {
3480 addReply(c,shared.wrongtypeerr);
3481 } else {
3482 list *list = o->ptr;
3483 listNode *ln;
3484
3485 ln = listIndex(list, index);
3486 if (ln == NULL) {
3487 addReply(c,shared.nullbulk);
3488 } else {
3489 robj *ele = listNodeValue(ln);
3490 addReplyBulkLen(c,ele);
3491 addReply(c,ele);
3492 addReply(c,shared.crlf);
3493 }
3494 }
3495 }
3496 }
3497
3498 static void lsetCommand(redisClient *c) {
3499 robj *o;
3500 int index = atoi(c->argv[2]->ptr);
3501
3502 o = lookupKeyWrite(c->db,c->argv[1]);
3503 if (o == NULL) {
3504 addReply(c,shared.nokeyerr);
3505 } else {
3506 if (o->type != REDIS_LIST) {
3507 addReply(c,shared.wrongtypeerr);
3508 } else {
3509 list *list = o->ptr;
3510 listNode *ln;
3511
3512 ln = listIndex(list, index);
3513 if (ln == NULL) {
3514 addReply(c,shared.outofrangeerr);
3515 } else {
3516 robj *ele = listNodeValue(ln);
3517
3518 decrRefCount(ele);
3519 listNodeValue(ln) = c->argv[3];
3520 incrRefCount(c->argv[3]);
3521 addReply(c,shared.ok);
3522 server.dirty++;
3523 }
3524 }
3525 }
3526 }
3527
3528 static void popGenericCommand(redisClient *c, int where) {
3529 robj *o;
3530
3531 o = lookupKeyWrite(c->db,c->argv[1]);
3532 if (o == NULL) {
3533 addReply(c,shared.nullbulk);
3534 } else {
3535 if (o->type != REDIS_LIST) {
3536 addReply(c,shared.wrongtypeerr);
3537 } else {
3538 list *list = o->ptr;
3539 listNode *ln;
3540
3541 if (where == REDIS_HEAD)
3542 ln = listFirst(list);
3543 else
3544 ln = listLast(list);
3545
3546 if (ln == NULL) {
3547 addReply(c,shared.nullbulk);
3548 } else {
3549 robj *ele = listNodeValue(ln);
3550 addReplyBulkLen(c,ele);
3551 addReply(c,ele);
3552 addReply(c,shared.crlf);
3553 listDelNode(list,ln);
3554 server.dirty++;
3555 }
3556 }
3557 }
3558 }
3559
3560 static void lpopCommand(redisClient *c) {
3561 popGenericCommand(c,REDIS_HEAD);
3562 }
3563
3564 static void rpopCommand(redisClient *c) {
3565 popGenericCommand(c,REDIS_TAIL);
3566 }
3567
3568 static void lrangeCommand(redisClient *c) {
3569 robj *o;
3570 int start = atoi(c->argv[2]->ptr);
3571 int end = atoi(c->argv[3]->ptr);
3572
3573 o = lookupKeyRead(c->db,c->argv[1]);
3574 if (o == NULL) {
3575 addReply(c,shared.nullmultibulk);
3576 } else {
3577 if (o->type != REDIS_LIST) {
3578 addReply(c,shared.wrongtypeerr);
3579 } else {
3580 list *list = o->ptr;
3581 listNode *ln;
3582 int llen = listLength(list);
3583 int rangelen, j;
3584 robj *ele;
3585
3586 /* convert negative indexes */
3587 if (start < 0) start = llen+start;
3588 if (end < 0) end = llen+end;
3589 if (start < 0) start = 0;
3590 if (end < 0) end = 0;
3591
3592 /* indexes sanity checks */
3593 if (start > end || start >= llen) {
3594 /* Out of range start or start > end result in empty list */
3595 addReply(c,shared.emptymultibulk);
3596 return;
3597 }
3598 if (end >= llen) end = llen-1;
3599 rangelen = (end-start)+1;
3600
3601 /* Return the result in form of a multi-bulk reply */
3602 ln = listIndex(list, start);
3603 addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen));
3604 for (j = 0; j < rangelen; j++) {
3605 ele = listNodeValue(ln);
3606 addReplyBulkLen(c,ele);
3607 addReply(c,ele);
3608 addReply(c,shared.crlf);
3609 ln = ln->next;
3610 }
3611 }
3612 }
3613 }
3614
3615 static void ltrimCommand(redisClient *c) {
3616 robj *o;
3617 int start = atoi(c->argv[2]->ptr);
3618 int end = atoi(c->argv[3]->ptr);
3619
3620 o = lookupKeyWrite(c->db,c->argv[1]);
3621 if (o == NULL) {
3622 addReply(c,shared.nokeyerr);
3623 } else {
3624 if (o->type != REDIS_LIST) {
3625 addReply(c,shared.wrongtypeerr);
3626 } else {
3627 list *list = o->ptr;
3628 listNode *ln;
3629 int llen = listLength(list);
3630 int j, ltrim, rtrim;
3631
3632 /* convert negative indexes */
3633 if (start < 0) start = llen+start;
3634 if (end < 0) end = llen+end;
3635 if (start < 0) start = 0;
3636 if (end < 0) end = 0;
3637
3638 /* indexes sanity checks */
3639 if (start > end || start >= llen) {
3640 /* Out of range start or start > end result in empty list */
3641 ltrim = llen;
3642 rtrim = 0;
3643 } else {
3644 if (end >= llen) end = llen-1;
3645 ltrim = start;
3646 rtrim = llen-end-1;
3647 }
3648
3649 /* Remove list elements to perform the trim */
3650 for (j = 0; j < ltrim; j++) {
3651 ln = listFirst(list);
3652 listDelNode(list,ln);
3653 }
3654 for (j = 0; j < rtrim; j++) {
3655 ln = listLast(list);
3656 listDelNode(list,ln);
3657 }
3658 server.dirty++;
3659 addReply(c,shared.ok);
3660 }
3661 }
3662 }
3663
3664 static void lremCommand(redisClient *c) {
3665 robj *o;
3666
3667 o = lookupKeyWrite(c->db,c->argv[1]);
3668 if (o == NULL) {
3669 addReply(c,shared.czero);
3670 } else {
3671 if (o->type != REDIS_LIST) {
3672 addReply(c,shared.wrongtypeerr);
3673 } else {
3674 list *list = o->ptr;
3675 listNode *ln, *next;
3676 int toremove = atoi(c->argv[2]->ptr);
3677 int removed = 0;
3678 int fromtail = 0;
3679
3680 if (toremove < 0) {
3681 toremove = -toremove;
3682 fromtail = 1;
3683 }
3684 ln = fromtail ? list->tail : list->head;
3685 while (ln) {
3686 robj *ele = listNodeValue(ln);
3687
3688 next = fromtail ? ln->prev : ln->next;
3689 if (compareStringObjects(ele,c->argv[3]) == 0) {
3690 listDelNode(list,ln);
3691 server.dirty++;
3692 removed++;
3693 if (toremove && removed == toremove) break;
3694 }
3695 ln = next;
3696 }
3697 addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",removed));
3698 }
3699 }
3700 }
3701
3702 /* This is the semantic of this command:
3703 * RPOPLPUSH srclist dstlist:
3704 * IF LLEN(srclist) > 0
3705 * element = RPOP srclist
3706 * LPUSH dstlist element
3707 * RETURN element
3708 * ELSE
3709 * RETURN nil
3710 * END
3711 * END
3712 *
3713 * The idea is to be able to get an element from a list in a reliable way
3714 * since the element is not just returned but pushed against another list
3715 * as well. This command was originally proposed by Ezra Zygmuntowicz.
3716 */
3717 static void rpoplpushcommand(redisClient *c) {
3718 robj *sobj;
3719
3720 sobj = lookupKeyWrite(c->db,c->argv[1]);
3721 if (sobj == NULL) {
3722 addReply(c,shared.nullbulk);
3723 } else {
3724 if (sobj->type != REDIS_LIST) {
3725 addReply(c,shared.wrongtypeerr);
3726 } else {
3727 list *srclist = sobj->ptr;
3728 listNode *ln = listLast(srclist);
3729
3730 if (ln == NULL) {
3731 addReply(c,shared.nullbulk);
3732 } else {
3733 robj *dobj = lookupKeyWrite(c->db,c->argv[2]);
3734 robj *ele = listNodeValue(ln);
3735 list *dstlist;
3736
3737 if (dobj == NULL) {
3738
3739 /* Create the list if the key does not exist */
3740 dobj = createListObject();
3741 dictAdd(c->db->dict,c->argv[2],dobj);
3742 incrRefCount(c->argv[2]);
3743 } else if (dobj->type != REDIS_LIST) {
3744 addReply(c,shared.wrongtypeerr);
3745 return;
3746 }
3747 /* Add the element to the target list */
3748 dstlist = dobj->ptr;
3749 listAddNodeHead(dstlist,ele);
3750 incrRefCount(ele);
3751
3752 /* Send the element to the client as reply as well */
3753 addReplyBulkLen(c,ele);
3754 addReply(c,ele);
3755 addReply(c,shared.crlf);
3756
3757 /* Finally remove the element from the source list */
3758 listDelNode(srclist,ln);
3759 server.dirty++;
3760 }
3761 }
3762 }
3763 }
3764
3765
3766 /* ==================================== Sets ================================ */
3767
3768 static void saddCommand(redisClient *c) {
3769 robj *set;
3770
3771 set = lookupKeyWrite(c->db,c->argv[1]);
3772 if (set == NULL) {
3773 set = createSetObject();
3774 dictAdd(c->db->dict,c->argv[1],set);
3775 incrRefCount(c->argv[1]);
3776 } else {
3777 if (set->type != REDIS_SET) {
3778 addReply(c,shared.wrongtypeerr);
3779 return;
3780 }
3781 }
3782 if (dictAdd(set->ptr,c->argv[2],NULL) == DICT_OK) {
3783 incrRefCount(c->argv[2]);
3784 server.dirty++;
3785 addReply(c,shared.cone);
3786 } else {
3787 addReply(c,shared.czero);
3788 }
3789 }
3790
3791 static void sremCommand(redisClient *c) {
3792 robj *set;
3793
3794 set = lookupKeyWrite(c->db,c->argv[1]);
3795 if (set == NULL) {
3796 addReply(c,shared.czero);
3797 } else {
3798 if (set->type != REDIS_SET) {
3799 addReply(c,shared.wrongtypeerr);
3800 return;
3801 }
3802 if (dictDelete(set->ptr,c->argv[2]) == DICT_OK) {
3803 server.dirty++;
3804 if (htNeedsResize(set->ptr)) dictResize(set->ptr);
3805 addReply(c,shared.cone);
3806 } else {
3807 addReply(c,shared.czero);
3808 }
3809 }
3810 }
3811
3812 static void smoveCommand(redisClient *c) {
3813 robj *srcset, *dstset;
3814
3815 srcset = lookupKeyWrite(c->db,c->argv[1]);
3816 dstset = lookupKeyWrite(c->db,c->argv[2]);
3817
3818 /* If the source key does not exist return 0, if it's of the wrong type
3819 * raise an error */
3820 if (srcset == NULL || srcset->type != REDIS_SET) {
3821 addReply(c, srcset ? shared.wrongtypeerr : shared.czero);
3822 return;
3823 }
3824 /* Error if the destination key is not a set as well */
3825 if (dstset && dstset->type != REDIS_SET) {
3826 addReply(c,shared.wrongtypeerr);
3827 return;
3828 }
3829 /* Remove the element from the source set */
3830 if (dictDelete(srcset->ptr,c->argv[3]) == DICT_ERR) {
3831 /* Key not found in the src set! return zero */
3832 addReply(c,shared.czero);
3833 return;
3834 }
3835 server.dirty++;
3836 /* Add the element to the destination set */
3837 if (!dstset) {
3838 dstset = createSetObject();
3839 dictAdd(c->db->dict,c->argv[2],dstset);
3840 incrRefCount(c->argv[2]);
3841 }
3842 if (dictAdd(dstset->ptr,c->argv[3],NULL) == DICT_OK)
3843 incrRefCount(c->argv[3]);
3844 addReply(c,shared.cone);
3845 }
3846
3847 static void sismemberCommand(redisClient *c) {
3848 robj *set;
3849
3850 set = lookupKeyRead(c->db,c->argv[1]);
3851 if (set == NULL) {
3852 addReply(c,shared.czero);
3853 } else {
3854 if (set->type != REDIS_SET) {
3855 addReply(c,shared.wrongtypeerr);
3856 return;
3857 }
3858 if (dictFind(set->ptr,c->argv[2]))
3859 addReply(c,shared.cone);
3860 else
3861 addReply(c,shared.czero);
3862 }
3863 }
3864
3865 static void scardCommand(redisClient *c) {
3866 robj *o;
3867 dict *s;
3868
3869 o = lookupKeyRead(c->db,c->argv[1]);
3870 if (o == NULL) {
3871 addReply(c,shared.czero);
3872 return;
3873 } else {
3874 if (o->type != REDIS_SET) {
3875 addReply(c,shared.wrongtypeerr);
3876 } else {
3877 s = o->ptr;
3878 addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
3879 dictSize(s)));
3880 }
3881 }
3882 }
3883
3884 static void spopCommand(redisClient *c) {
3885 robj *set;
3886 dictEntry *de;
3887
3888 set = lookupKeyWrite(c->db,c->argv[1]);
3889 if (set == NULL) {
3890 addReply(c,shared.nullbulk);
3891 } else {
3892 if (set->type != REDIS_SET) {
3893 addReply(c,shared.wrongtypeerr);
3894 return;
3895 }
3896 de = dictGetRandomKey(set->ptr);
3897 if (de == NULL) {
3898 addReply(c,shared.nullbulk);
3899 } else {
3900 robj *ele = dictGetEntryKey(de);
3901
3902 addReplyBulkLen(c,ele);
3903 addReply(c,ele);
3904 addReply(c,shared.crlf);
3905 dictDelete(set->ptr,ele);
3906 if (htNeedsResize(set->ptr)) dictResize(set->ptr);
3907 server.dirty++;
3908 }
3909 }
3910 }
3911
3912 static void srandmemberCommand(redisClient *c) {
3913 robj *set;
3914 dictEntry *de;
3915
3916 set = lookupKeyRead(c->db,c->argv[1]);
3917 if (set == NULL) {
3918 addReply(c,shared.nullbulk);
3919 } else {
3920 if (set->type != REDIS_SET) {
3921 addReply(c,shared.wrongtypeerr);
3922 return;
3923 }
3924 de = dictGetRandomKey(set->ptr);
3925 if (de == NULL) {
3926 addReply(c,shared.nullbulk);
3927 } else {
3928 robj *ele = dictGetEntryKey(de);
3929
3930 addReplyBulkLen(c,ele);
3931 addReply(c,ele);
3932 addReply(c,shared.crlf);
3933 }
3934 }
3935 }
3936
3937 static int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
3938 dict **d1 = (void*) s1, **d2 = (void*) s2;
3939
3940 return dictSize(*d1)-dictSize(*d2);
3941 }
3942
3943 static void sinterGenericCommand(redisClient *c, robj **setskeys, unsigned long setsnum, robj *dstkey) {
3944 dict **dv = zmalloc(sizeof(dict*)*setsnum);
3945 dictIterator *di;
3946 dictEntry *de;
3947 robj *lenobj = NULL, *dstset = NULL;
3948 unsigned long j, cardinality = 0;
3949
3950 for (j = 0; j < setsnum; j++) {
3951 robj *setobj;
3952
3953 setobj = dstkey ?
3954 lookupKeyWrite(c->db,setskeys[j]) :
3955 lookupKeyRead(c->db,setskeys[j]);
3956 if (!setobj) {
3957 zfree(dv);
3958 if (dstkey) {
3959 deleteKey(c->db,dstkey);
3960 addReply(c,shared.ok);
3961 } else {
3962 addReply(c,shared.nullmultibulk);
3963 }
3964 return;
3965 }
3966 if (setobj->type != REDIS_SET) {
3967 zfree(dv);
3968 addReply(c,shared.wrongtypeerr);
3969 return;
3970 }
3971 dv[j] = setobj->ptr;
3972 }
3973 /* Sort sets from the smallest to largest, this will improve our
3974 * algorithm's performace */
3975 qsort(dv,setsnum,sizeof(dict*),qsortCompareSetsByCardinality);
3976
3977 /* The first thing we should output is the total number of elements...
3978 * since this is a multi-bulk write, but at this stage we don't know
3979 * the intersection set size, so we use a trick, append an empty object
3980 * to the output list and save the pointer to later modify it with the
3981 * right length */
3982 if (!dstkey) {
3983 lenobj = createObject(REDIS_STRING,NULL);
3984 addReply(c,lenobj);
3985 decrRefCount(lenobj);
3986 } else {
3987 /* If we have a target key where to store the resulting set
3988 * create this key with an empty set inside */
3989 dstset = createSetObject();
3990 }
3991
3992 /* Iterate all the elements of the first (smallest) set, and test
3993 * the element against all the other sets, if at least one set does
3994 * not include the element it is discarded */
3995 di = dictGetIterator(dv[0]);
3996
3997 while((de = dictNext(di)) != NULL) {
3998 robj *ele;
3999
4000 for (j = 1; j < setsnum; j++)
4001 if (dictFind(dv[j],dictGetEntryKey(de)) == NULL) break;
4002 if (j != setsnum)
4003 continue; /* at least one set does not contain the member */
4004 ele = dictGetEntryKey(de);
4005 if (!dstkey) {
4006 addReplyBulkLen(c,ele);
4007 addReply(c,ele);
4008 addReply(c,shared.crlf);
4009 cardinality++;
4010 } else {
4011 dictAdd(dstset->ptr,ele,NULL);
4012 incrRefCount(ele);
4013 }
4014 }
4015 dictReleaseIterator(di);
4016
4017 if (dstkey) {
4018 /* Store the resulting set into the target */
4019 deleteKey(c->db,dstkey);
4020 dictAdd(c->db->dict,dstkey,dstset);
4021 incrRefCount(dstkey);
4022 }
4023
4024 if (!dstkey) {
4025 lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",cardinality);
4026 } else {
4027 addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
4028 dictSize((dict*)dstset->ptr)));
4029 server.dirty++;
4030 }
4031 zfree(dv);
4032 }
4033
4034 static void sinterCommand(redisClient *c) {
4035 sinterGenericCommand(c,c->argv+1,c->argc-1,NULL);
4036 }
4037
4038 static void sinterstoreCommand(redisClient *c) {
4039 sinterGenericCommand(c,c->argv+2,c->argc-2,c->argv[1]);
4040 }
4041
4042 #define REDIS_OP_UNION 0
4043 #define REDIS_OP_DIFF 1
4044
4045 static void sunionDiffGenericCommand(redisClient *c, robj **setskeys, int setsnum, robj *dstkey, int op) {
4046 dict **dv = zmalloc(sizeof(dict*)*setsnum);
4047 dictIterator *di;
4048 dictEntry *de;
4049 robj *dstset = NULL;
4050 int j, cardinality = 0;
4051
4052 for (j = 0; j < setsnum; j++) {
4053 robj *setobj;
4054
4055 setobj = dstkey ?
4056 lookupKeyWrite(c->db,setskeys[j]) :
4057 lookupKeyRead(c->db,setskeys[j]);
4058 if (!setobj) {
4059 dv[j] = NULL;
4060 continue;
4061 }
4062 if (setobj->type != REDIS_SET) {
4063 zfree(dv);
4064 addReply(c,shared.wrongtypeerr);
4065 return;
4066 }
4067 dv[j] = setobj->ptr;
4068 }
4069
4070 /* We need a temp set object to store our union. If the dstkey
4071 * is not NULL (that is, we are inside an SUNIONSTORE operation) then
4072 * this set object will be the resulting object to set into the target key*/
4073 dstset = createSetObject();
4074
4075 /* Iterate all the elements of all the sets, add every element a single
4076 * time to the result set */
4077 for (j = 0; j < setsnum; j++) {
4078 if (op == REDIS_OP_DIFF && j == 0 && !dv[j]) break; /* result set is empty */
4079 if (!dv[j]) continue; /* non existing keys are like empty sets */
4080
4081 di = dictGetIterator(dv[j]);
4082
4083 while((de = dictNext(di)) != NULL) {
4084 robj *ele;
4085
4086 /* dictAdd will not add the same element multiple times */
4087 ele = dictGetEntryKey(de);
4088 if (op == REDIS_OP_UNION || j == 0) {
4089 if (dictAdd(dstset->ptr,ele,NULL) == DICT_OK) {
4090 incrRefCount(ele);
4091 cardinality++;
4092 }
4093 } else if (op == REDIS_OP_DIFF) {
4094 if (dictDelete(dstset->ptr,ele) == DICT_OK) {
4095 cardinality--;
4096 }
4097 }
4098 }
4099 dictReleaseIterator(di);
4100
4101 if (op == REDIS_OP_DIFF && cardinality == 0) break; /* result set is empty */
4102 }
4103
4104 /* Output the content of the resulting set, if not in STORE mode */
4105 if (!dstkey) {
4106 addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",cardinality));
4107 di = dictGetIterator(dstset->ptr);
4108 while((de = dictNext(di)) != NULL) {
4109 robj *ele;
4110
4111 ele = dictGetEntryKey(de);
4112 addReplyBulkLen(c,ele);
4113 addReply(c,ele);
4114 addReply(c,shared.crlf);
4115 }
4116 dictReleaseIterator(di);
4117 } else {
4118 /* If we have a target key where to store the resulting set
4119 * create this key with the result set inside */
4120 deleteKey(c->db,dstkey);
4121 dictAdd(c->db->dict,dstkey,dstset);
4122 incrRefCount(dstkey);
4123 }
4124
4125 /* Cleanup */
4126 if (!dstkey) {
4127 decrRefCount(dstset);
4128 } else {
4129 addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",
4130 dictSize((dict*)dstset->ptr)));
4131 server.dirty++;
4132 }
4133 zfree(dv);
4134 }
4135
4136 static void sunionCommand(redisClient *c) {
4137 sunionDiffGenericCommand(c,c->argv+1,c->argc-1,NULL,REDIS_OP_UNION);
4138 }
4139
4140 static void sunionstoreCommand(redisClient *c) {
4141 sunionDiffGenericCommand(c,c->argv+2,c->argc-2,c->argv[1],REDIS_OP_UNION);
4142 }
4143
4144 static void sdiffCommand(redisClient *c) {
4145 sunionDiffGenericCommand(c,c->argv+1,c->argc-1,NULL,REDIS_OP_DIFF);
4146 }
4147
4148 static void sdiffstoreCommand(redisClient *c) {
4149 sunionDiffGenericCommand(c,c->argv+2,c->argc-2,c->argv[1],REDIS_OP_DIFF);
4150 }
4151
4152 /* ==================================== ZSets =============================== */
4153
4154 /* ZSETs are ordered sets using two data structures to hold the same elements
4155 * in order to get O(log(N)) INSERT and REMOVE operations into a sorted
4156 * data structure.
4157 *
4158 * The elements are added to an hash table mapping Redis objects to scores.
4159 * At the same time the elements are added to a skip list mapping scores
4160 * to Redis objects (so objects are sorted by scores in this "view"). */
4161
4162 /* This skiplist implementation is almost a C translation of the original
4163 * algorithm described by William Pugh in "Skip Lists: A Probabilistic
4164 * Alternative to Balanced Trees", modified in three ways:
4165 * a) this implementation allows for repeated values.
4166 * b) the comparison is not just by key (our 'score') but by satellite data.
4167 * c) there is a back pointer, so it's a doubly linked list with the back
4168 * pointers being only at "level 1". This allows to traverse the list
4169 * from tail to head, useful for ZREVRANGE. */
4170
4171 static zskiplistNode *zslCreateNode(int level, double score, robj *obj) {
4172 zskiplistNode *zn = zmalloc(sizeof(*zn));
4173
4174 zn->forward = zmalloc(sizeof(zskiplistNode*) * level);
4175 zn->score = score;
4176 zn->obj = obj;
4177 return zn;
4178 }
4179
4180 static zskiplist *zslCreate(void) {
4181 int j;
4182 zskiplist *zsl;
4183
4184 zsl = zmalloc(sizeof(*zsl));
4185 zsl->level = 1;
4186 zsl->length = 0;
4187 zsl->header = zslCreateNode(ZSKIPLIST_MAXLEVEL,0,NULL);
4188 for (j = 0; j < ZSKIPLIST_MAXLEVEL; j++)
4189 zsl->header->forward[j] = NULL;
4190 zsl->header->backward = NULL;
4191 zsl->tail = NULL;
4192 return zsl;
4193 }
4194
4195 static void zslFreeNode(zskiplistNode *node) {
4196 decrRefCount(node->obj);
4197 zfree(node->forward);
4198 zfree(node);
4199 }
4200
4201 static void zslFree(zskiplist *zsl) {
4202 zskiplistNode *node = zsl->header->forward[0], *next;
4203
4204 zfree(zsl->header->forward);
4205 zfree(zsl->header);
4206 while(node) {
4207 next = node->forward[0];
4208 zslFreeNode(node);
4209 node = next;
4210 }
4211 zfree(zsl);
4212 }
4213
4214 static int zslRandomLevel(void) {
4215 int level = 1;
4216 while ((random()&0xFFFF) < (ZSKIPLIST_P * 0xFFFF))
4217 level += 1;
4218 return level;
4219 }
4220
4221 static void zslInsert(zskiplist *zsl, double score, robj *obj) {
4222 zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
4223 int i, level;
4224
4225 x = zsl->header;
4226 for (i = zsl->level-1; i >= 0; i--) {
4227 while (x->forward[i] &&
4228 (x->forward[i]->score < score ||
4229 (x->forward[i]->score == score &&
4230 compareStringObjects(x->forward[i]->obj,obj) < 0)))
4231 x = x->forward[i];
4232 update[i] = x;
4233 }
4234 /* we assume the key is not already inside, since we allow duplicated
4235 * scores, and the re-insertion of score and redis object should never
4236 * happpen since the caller of zslInsert() should test in the hash table
4237 * if the element is already inside or not. */
4238 level = zslRandomLevel();
4239 if (level > zsl->level) {
4240 for (i = zsl->level; i < level; i++)
4241 update[i] = zsl->header;
4242 zsl->level = level;
4243 }
4244 x = zslCreateNode(level,score,obj);
4245 for (i = 0; i < level; i++) {
4246 x->forward[i] = update[i]->forward[i];
4247 update[i]->forward[i] = x;
4248 }
4249 x->backward = (update[0] == zsl->header) ? NULL : update[0];
4250 if (x->forward[0])
4251 x->forward[0]->backward = x;
4252 else
4253 zsl->tail = x;
4254 zsl->length++;
4255 }
4256
4257 /* Delete an element with matching score/object from the skiplist. */
4258 static int zslDelete(zskiplist *zsl, double score, robj *obj) {
4259 zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
4260 int i;
4261
4262 x = zsl->header;
4263 for (i = zsl->level-1; i >= 0; i--) {
4264 while (x->forward[i] &&
4265 (x->forward[i]->score < score ||
4266 (x->forward[i]->score == score &&
4267 compareStringObjects(x->forward[i]->obj,obj) < 0)))
4268 x = x->forward[i];
4269 update[i] = x;
4270 }
4271 /* We may have multiple elements with the same score, what we need
4272 * is to find the element with both the right score and object. */
4273 x = x->forward[0];
4274 if (x && score == x->score && compareStringObjects(x->obj,obj) == 0) {
4275 for (i = 0; i < zsl->level; i++) {
4276 if (update[i]->forward[i] != x) break;
4277 update[i]->forward[i] = x->forward[i];
4278 }
4279 if (x->forward[0]) {
4280 x->forward[0]->backward = (x->backward == zsl->header) ?
4281 NULL : x->backward;
4282 } else {
4283 zsl->tail = x->backward;
4284 }
4285 zslFreeNode(x);
4286 while(zsl->level > 1 && zsl->header->forward[zsl->level-1] == NULL)
4287 zsl->level--;
4288 zsl->length--;
4289 return 1;
4290 } else {
4291 return 0; /* not found */
4292 }
4293 return 0; /* not found */
4294 }
4295
4296 /* Delete all the elements with score between min and max from the skiplist.
4297 * Min and mx are inclusive, so a score >= min || score <= max is deleted.
4298 * Note that this function takes the reference to the hash table view of the
4299 * sorted set, in order to remove the elements from the hash table too. */
4300 static unsigned long zslDeleteRange(zskiplist *zsl, double min, double max, dict *dict) {
4301 zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
4302 unsigned long removed = 0;
4303 int i;
4304
4305 x = zsl->header;
4306 for (i = zsl->level-1; i >= 0; i--) {
4307 while (x->forward[i] && x->forward[i]->score < min)
4308 x = x->forward[i];
4309 update[i] = x;
4310 }
4311 /* We may have multiple elements with the same score, what we need
4312 * is to find the element with both the right score and object. */
4313 x = x->forward[0];
4314 while (x && x->score <= max) {
4315 zskiplistNode *next;
4316
4317 for (i = 0; i < zsl->level; i++) {
4318 if (update[i]->forward[i] != x) break;
4319 update[i]->forward[i] = x->forward[i];
4320 }
4321 if (x->forward[0]) {
4322 x->forward[0]->backward = (x->backward == zsl->header) ?
4323 NULL : x->backward;
4324 } else {
4325 zsl->tail = x->backward;
4326 }
4327 next = x->forward[0];
4328 dictDelete(dict,x->obj);
4329 zslFreeNode(x);
4330 while(zsl->level > 1 && zsl->header->forward[zsl->level-1] == NULL)
4331 zsl->level--;
4332 zsl->length--;
4333 removed++;
4334 x = next;
4335 }
4336 return removed; /* not found */
4337 }
4338
4339 /* Find the first node having a score equal or greater than the specified one.
4340 * Returns NULL if there is no match. */
4341 static zskiplistNode *zslFirstWithScore(zskiplist *zsl, double score) {
4342 zskiplistNode *x;
4343 int i;
4344
4345 x = zsl->header;
4346 for (i = zsl->level-1; i >= 0; i--) {
4347 while (x->forward[i] && x->forward[i]->score < score)
4348 x = x->forward[i];
4349 }
4350 /* We may have multiple elements with the same score, what we need
4351 * is to find the element with both the right score and object. */
4352 return x->forward[0];
4353 }
4354
4355 /* The actual Z-commands implementations */
4356
4357 /* This generic command implements both ZADD and ZINCRBY.
4358 * scoreval is the score if the operation is a ZADD (doincrement == 0) or
4359 * the increment if the operation is a ZINCRBY (doincrement == 1). */
4360 static void zaddGenericCommand(redisClient *c, robj *key, robj *ele, double scoreval, int doincrement) {
4361 robj *zsetobj;
4362 zset *zs;
4363 double *score;
4364
4365 zsetobj = lookupKeyWrite(c->db,key);
4366 if (zsetobj == NULL) {
4367 zsetobj = createZsetObject();
4368 dictAdd(c->db->dict,key,zsetobj);
4369 incrRefCount(key);
4370 } else {
4371 if (zsetobj->type != REDIS_ZSET) {
4372 addReply(c,shared.wrongtypeerr);
4373 return;
4374 }
4375 }
4376 zs = zsetobj->ptr;
4377
4378 /* Ok now since we implement both ZADD and ZINCRBY here the code
4379 * needs to handle the two different conditions. It's all about setting
4380 * '*score', that is, the new score to set, to the right value. */
4381 score = zmalloc(sizeof(double));
4382 if (doincrement) {
4383 dictEntry *de;
4384
4385 /* Read the old score. If the element was not present starts from 0 */
4386 de = dictFind(zs->dict,ele);
4387 if (de) {
4388 double *oldscore = dictGetEntryVal(de);
4389 *score = *oldscore + scoreval;
4390 } else {
4391 *score = scoreval;
4392 }
4393 } else {
4394 *score = scoreval;
4395 }
4396
4397 /* What follows is a simple remove and re-insert operation that is common
4398 * to both ZADD and ZINCRBY... */
4399 if (dictAdd(zs->dict,ele,score) == DICT_OK) {
4400 /* case 1: New element */
4401 incrRefCount(ele); /* added to hash */
4402 zslInsert(zs->zsl,*score,ele);
4403 incrRefCount(ele); /* added to skiplist */
4404 server.dirty++;
4405 if (doincrement)
4406 addReplyDouble(c,*score);
4407 else
4408 addReply(c,shared.cone);
4409 } else {
4410 dictEntry *de;
4411 double *oldscore;
4412
4413 /* case 2: Score update operation */
4414 de = dictFind(zs->dict,ele);
4415 redisAssert(de != NULL);
4416 oldscore = dictGetEntryVal(de);
4417 if (*score != *oldscore) {
4418 int deleted;
4419
4420 /* Remove and insert the element in the skip list with new score */
4421 deleted = zslDelete(zs->zsl,*oldscore,ele);
4422 redisAssert(deleted != 0);
4423 zslInsert(zs->zsl,*score,ele);
4424 incrRefCount(ele);
4425 /* Update the score in the hash table */
4426 dictReplace(zs->dict,ele,score);
4427 server.dirty++;
4428 } else {
4429 zfree(score);
4430 }
4431 if (doincrement)
4432 addReplyDouble(c,*score);
4433 else
4434 addReply(c,shared.czero);
4435 }
4436 }
4437
4438 static void zaddCommand(redisClient *c) {
4439 double scoreval;
4440
4441 scoreval = strtod(c->argv[2]->ptr,NULL);
4442 zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,0);
4443 }
4444
4445 static void zincrbyCommand(redisClient *c) {
4446 double scoreval;
4447
4448 scoreval = strtod(c->argv[2]->ptr,NULL);
4449 zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,1);
4450 }
4451
4452 static void zremCommand(redisClient *c) {
4453 robj *zsetobj;
4454 zset *zs;
4455
4456 zsetobj = lookupKeyWrite(c->db,c->argv[1]);
4457 if (zsetobj == NULL) {
4458 addReply(c,shared.czero);
4459 } else {
4460 dictEntry *de;
4461 double *oldscore;
4462 int deleted;
4463
4464 if (zsetobj->type != REDIS_ZSET) {
4465 addReply(c,shared.wrongtypeerr);
4466 return;
4467 }
4468 zs = zsetobj->ptr;
4469 de = dictFind(zs->dict,c->argv[2]);
4470 if (de == NULL) {
4471 addReply(c,shared.czero);
4472 return;
4473 }
4474 /* Delete from the skiplist */
4475 oldscore = dictGetEntryVal(de);
4476 deleted = zslDelete(zs->zsl,*oldscore,c->argv[2]);
4477 redisAssert(deleted != 0);
4478
4479 /* Delete from the hash table */
4480 dictDelete(zs->dict,c->argv[2]);
4481 if (htNeedsResize(zs->dict)) dictResize(zs->dict);
4482 server.dirty++;
4483 addReply(c,shared.cone);
4484 }
4485 }
4486
4487 static void zremrangebyscoreCommand(redisClient *c) {
4488 double min = strtod(c->argv[2]->ptr,NULL);
4489 double max = strtod(c->argv[3]->ptr,NULL);
4490 robj *zsetobj;
4491 zset *zs;
4492
4493 zsetobj = lookupKeyWrite(c->db,c->argv[1]);
4494 if (zsetobj == NULL) {
4495 addReply(c,shared.czero);
4496 } else {
4497 long deleted;
4498
4499 if (zsetobj->type != REDIS_ZSET) {
4500 addReply(c,shared.wrongtypeerr);
4501 return;
4502 }
4503 zs = zsetobj->ptr;
4504 deleted = zslDeleteRange(zs->zsl,min,max,zs->dict);
4505 if (htNeedsResize(zs->dict)) dictResize(zs->dict);
4506 server.dirty += deleted;
4507 addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",deleted));
4508 }
4509 }
4510
4511 static void zrangeGenericCommand(redisClient *c, int reverse) {
4512 robj *o;
4513 int start = atoi(c->argv[2]->ptr);
4514 int end = atoi(c->argv[3]->ptr);
4515
4516 o = lookupKeyRead(c->db,c->argv[1]);
4517 if (o == NULL) {
4518 addReply(c,shared.nullmultibulk);
4519 } else {
4520 if (o->type != REDIS_ZSET) {
4521 addReply(c,shared.wrongtypeerr);
4522 } else {
4523 zset *zsetobj = o->ptr;
4524 zskiplist *zsl = zsetobj->zsl;
4525 zskiplistNode *ln;
4526
4527 int llen = zsl->length;
4528 int rangelen, j;
4529 robj *ele;
4530
4531 /* convert negative indexes */
4532 if (start < 0) start = llen+start;
4533 if (end < 0) end = llen+end;
4534 if (start < 0) start = 0;
4535 if (end < 0) end = 0;
4536
4537 /* indexes sanity checks */
4538 if (start > end || start >= llen) {
4539 /* Out of range start or start > end result in empty list */
4540 addReply(c,shared.emptymultibulk);
4541 return;
4542 }
4543 if (end >= llen) end = llen-1;
4544 rangelen = (end-start)+1;
4545
4546 /* Return the result in form of a multi-bulk reply */
4547 if (reverse) {
4548 ln = zsl->tail;
4549 while (start--)
4550 ln = ln->backward;
4551 } else {
4552 ln = zsl->header->forward[0];
4553 while (start--)
4554 ln = ln->forward[0];
4555 }
4556
4557 addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",rangelen));
4558 for (j = 0; j < rangelen; j++) {
4559 ele = ln->obj;
4560 addReplyBulkLen(c,ele);
4561 addReply(c,ele);
4562 addReply(c,shared.crlf);
4563 ln = reverse ? ln->backward : ln->forward[0];
4564 }
4565 }
4566 }
4567 }
4568
4569 static void zrangeCommand(redisClient *c) {
4570 zrangeGenericCommand(c,0);
4571 }
4572
4573 static void zrevrangeCommand(redisClient *c) {
4574 zrangeGenericCommand(c,1);
4575 }
4576
4577 static void zrangebyscoreCommand(redisClient *c) {
4578 robj *o;
4579 double min = strtod(c->argv[2]->ptr,NULL);
4580 double max = strtod(c->argv[3]->ptr,NULL);
4581 int offset = 0, limit = -1;
4582
4583 if (c->argc != 4 && c->argc != 7) {
4584 addReplySds(c,sdsnew("-ERR wrong number of arguments\r\n"));
4585 return;
4586 } else if (c->argc == 7 && strcasecmp(c->argv[4]->ptr,"limit")) {
4587 addReply(c,shared.syntaxerr);
4588 return;
4589 } else if (c->argc == 7) {
4590 offset = atoi(c->argv[5]->ptr);
4591 limit = atoi(c->argv[6]->ptr);
4592 if (offset < 0) offset = 0;
4593 }
4594
4595 o = lookupKeyRead(c->db,c->argv[1]);
4596 if (o == NULL) {
4597 addReply(c,shared.nullmultibulk);
4598 } else {
4599 if (o->type != REDIS_ZSET) {
4600 addReply(c,shared.wrongtypeerr);
4601 } else {
4602 zset *zsetobj = o->ptr;
4603 zskiplist *zsl = zsetobj->zsl;
4604 zskiplistNode *ln;
4605 robj *ele, *lenobj;
4606 unsigned int rangelen = 0;
4607
4608 /* Get the first node with the score >= min */
4609 ln = zslFirstWithScore(zsl,min);
4610 if (ln == NULL) {
4611 /* No element matching the speciifed interval */
4612 addReply(c,shared.emptymultibulk);
4613 return;
4614 }
4615
4616 /* We don't know in advance how many matching elements there
4617 * are in the list, so we push this object that will represent
4618 * the multi-bulk length in the output buffer, and will "fix"
4619 * it later */
4620 lenobj = createObject(REDIS_STRING,NULL);
4621 addReply(c,lenobj);
4622 decrRefCount(lenobj);
4623
4624 while(ln && ln->score <= max) {
4625 if (offset) {
4626 offset--;
4627 ln = ln->forward[0];
4628 continue;
4629 }
4630 if (limit == 0) break;
4631 ele = ln->obj;
4632 addReplyBulkLen(c,ele);
4633 addReply(c,ele);
4634 addReply(c,shared.crlf);
4635 ln = ln->forward[0];
4636 rangelen++;
4637 if (limit > 0) limit--;
4638 }
4639 lenobj->ptr = sdscatprintf(sdsempty(),"*%d\r\n",rangelen);
4640 }
4641 }
4642 }
4643
4644 static void zcardCommand(redisClient *c) {
4645 robj *o;
4646 zset *zs;
4647
4648 o = lookupKeyRead(c->db,c->argv[1]);
4649 if (o == NULL) {
4650 addReply(c,shared.czero);
4651 return;
4652 } else {
4653 if (o->type != REDIS_ZSET) {
4654 addReply(c,shared.wrongtypeerr);
4655 } else {
4656 zs = o->ptr;
4657 addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",zs->zsl->length));
4658 }
4659 }
4660 }
4661
4662 static void zscoreCommand(redisClient *c) {
4663 robj *o;
4664 zset *zs;
4665
4666 o = lookupKeyRead(c->db,c->argv[1]);
4667 if (o == NULL) {
4668 addReply(c,shared.nullbulk);
4669 return;
4670 } else {
4671 if (o->type != REDIS_ZSET) {
4672 addReply(c,shared.wrongtypeerr);
4673 } else {
4674 dictEntry *de;
4675
4676 zs = o->ptr;
4677 de = dictFind(zs->dict,c->argv[2]);
4678 if (!de) {
4679 addReply(c,shared.nullbulk);
4680 } else {
4681 double *score = dictGetEntryVal(de);
4682
4683 addReplyDouble(c,*score);
4684 }
4685 }
4686 }
4687 }
4688
4689 /* ========================= Non type-specific commands ==================== */
4690
4691 static void flushdbCommand(redisClient *c) {
4692 server.dirty += dictSize(c->db->dict);
4693 dictEmpty(c->db->dict);
4694 dictEmpty(c->db->expires);
4695 addReply(c,shared.ok);
4696 }
4697
4698 static void flushallCommand(redisClient *c) {
4699 server.dirty += emptyDb();
4700 addReply(c,shared.ok);
4701 rdbSave(server.dbfilename);
4702 server.dirty++;
4703 }
4704
4705 static redisSortOperation *createSortOperation(int type, robj *pattern) {
4706 redisSortOperation *so = zmalloc(sizeof(*so));
4707 so->type = type;
4708 so->pattern = pattern;
4709 return so;
4710 }
4711
4712 /* Return the value associated to the key with a name obtained
4713 * substituting the first occurence of '*' in 'pattern' with 'subst' */
4714 static robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
4715 char *p;
4716 sds spat, ssub;
4717 robj keyobj;
4718 int prefixlen, sublen, postfixlen;
4719 /* Expoit the internal sds representation to create a sds string allocated on the stack in order to make this function faster */
4720 struct {
4721 long len;
4722 long free;
4723 char buf[REDIS_SORTKEY_MAX+1];
4724 } keyname;
4725
4726 /* If the pattern is "#" return the substitution object itself in order
4727 * to implement the "SORT ... GET #" feature. */
4728 spat = pattern->ptr;
4729 if (spat[0] == '#' && spat[1] == '\0') {
4730 return subst;
4731 }
4732
4733 /* The substitution object may be specially encoded. If so we create
4734 * a decoded object on the fly. Otherwise getDecodedObject will just
4735 * increment the ref count, that we'll decrement later. */
4736 subst = getDecodedObject(subst);
4737
4738 ssub = subst->ptr;
4739 if (sdslen(spat)+sdslen(ssub)-1 > REDIS_SORTKEY_MAX) return NULL;
4740 p = strchr(spat,'*');
4741 if (!p) {
4742 decrRefCount(subst);
4743 return NULL;
4744 }
4745
4746 prefixlen = p-spat;
4747 sublen = sdslen(ssub);
4748 postfixlen = sdslen(spat)-(prefixlen+1);
4749 memcpy(keyname.buf,spat,prefixlen);
4750 memcpy(keyname.buf+prefixlen,ssub,sublen);
4751 memcpy(keyname.buf+prefixlen+sublen,p+1,postfixlen);
4752 keyname.buf[prefixlen+sublen+postfixlen] = '\0';
4753 keyname.len = prefixlen+sublen+postfixlen;
4754
4755 initStaticStringObject(keyobj,((char*)&keyname)+(sizeof(long)*2))
4756 decrRefCount(subst);
4757
4758 /* printf("lookup '%s' => %p\n", keyname.buf,de); */
4759 return lookupKeyRead(db,&keyobj);
4760 }
4761
4762 /* sortCompare() is used by qsort in sortCommand(). Given that qsort_r with
4763 * the additional parameter is not standard but a BSD-specific we have to
4764 * pass sorting parameters via the global 'server' structure */
4765 static int sortCompare(const void *s1, const void *s2) {
4766 const redisSortObject *so1 = s1, *so2 = s2;
4767 int cmp;
4768
4769 if (!server.sort_alpha) {
4770 /* Numeric sorting. Here it's trivial as we precomputed scores */
4771 if (so1->u.score > so2->u.score) {
4772 cmp = 1;
4773 } else if (so1->u.score < so2->u.score) {
4774 cmp = -1;
4775 } else {
4776 cmp = 0;
4777 }
4778 } else {
4779 /* Alphanumeric sorting */
4780 if (server.sort_bypattern) {
4781 if (!so1->u.cmpobj || !so2->u.cmpobj) {
4782 /* At least one compare object is NULL */
4783 if (so1->u.cmpobj == so2->u.cmpobj)
4784 cmp = 0;
4785 else if (so1->u.cmpobj == NULL)
4786 cmp = -1;
4787 else
4788 cmp = 1;
4789 } else {
4790 /* We have both the objects, use strcoll */
4791 cmp = strcoll(so1->u.cmpobj->ptr,so2->u.cmpobj->ptr);
4792 }
4793 } else {
4794 /* Compare elements directly */
4795 robj *dec1, *dec2;
4796
4797 dec1 = getDecodedObject(so1->obj);
4798 dec2 = getDecodedObject(so2->obj);
4799 cmp = strcoll(dec1->ptr,dec2->ptr);
4800 decrRefCount(dec1);
4801 decrRefCount(dec2);
4802 }
4803 }
4804 return server.sort_desc ? -cmp : cmp;
4805 }
4806
4807 /* The SORT command is the most complex command in Redis. Warning: this code
4808 * is optimized for speed and a bit less for readability */
4809 static void sortCommand(redisClient *c) {
4810 list *operations;
4811 int outputlen = 0;
4812 int desc = 0, alpha = 0;
4813 int limit_start = 0, limit_count = -1, start, end;
4814 int j, dontsort = 0, vectorlen;
4815 int getop = 0; /* GET operation counter */
4816 robj *sortval, *sortby = NULL, *storekey = NULL;
4817 redisSortObject *vector; /* Resulting vector to sort */
4818
4819 /* Lookup the key to sort. It must be of the right types */
4820 sortval = lookupKeyRead(c->db,c->argv[1]);
4821 if (sortval == NULL) {
4822 addReply(c,shared.nokeyerr);
4823 return;
4824 }
4825 if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST &&
4826 sortval->type != REDIS_ZSET)
4827 {
4828 addReply(c,shared.wrongtypeerr);
4829 return;
4830 }
4831
4832 /* Create a list of operations to perform for every sorted element.
4833 * Operations can be GET/DEL/INCR/DECR */
4834 operations = listCreate();
4835 listSetFreeMethod(operations,zfree);
4836 j = 2;
4837
4838 /* Now we need to protect sortval incrementing its count, in the future
4839 * SORT may have options able to overwrite/delete keys during the sorting
4840 * and the sorted key itself may get destroied */
4841 incrRefCount(sortval);
4842
4843 /* The SORT command has an SQL-alike syntax, parse it */
4844 while(j < c->argc) {
4845 int leftargs = c->argc-j-1;
4846 if (!strcasecmp(c->argv[j]->ptr,"asc")) {
4847 desc = 0;
4848 } else if (!strcasecmp(c->argv[j]->ptr,"desc")) {
4849 desc = 1;
4850 } else if (!strcasecmp(c->argv[j]->ptr,"alpha")) {
4851 alpha = 1;
4852 } else if (!strcasecmp(c->argv[j]->ptr,"limit") && leftargs >= 2) {
4853 limit_start = atoi(c->argv[j+1]->ptr);
4854 limit_count = atoi(c->argv[j+2]->ptr);
4855 j+=2;
4856 } else if (!strcasecmp(c->argv[j]->ptr,"store") && leftargs >= 1) {
4857 storekey = c->argv[j+1];
4858 j++;
4859 } else if (!strcasecmp(c->argv[j]->ptr,"by") && leftargs >= 1) {
4860 sortby = c->argv[j+1];
4861 /* If the BY pattern does not contain '*', i.e. it is constant,
4862 * we don't need to sort nor to lookup the weight keys. */
4863 if (strchr(c->argv[j+1]->ptr,'*') == NULL) dontsort = 1;
4864 j++;
4865 } else if (!strcasecmp(c->argv[j]->ptr,"get") && leftargs >= 1) {
4866 listAddNodeTail(operations,createSortOperation(
4867 REDIS_SORT_GET,c->argv[j+1]));
4868 getop++;
4869 j++;
4870 } else {
4871 decrRefCount(sortval);
4872 listRelease(operations);
4873 addReply(c,shared.syntaxerr);
4874 return;
4875 }
4876 j++;
4877 }
4878
4879 /* Load the sorting vector with all the objects to sort */
4880 switch(sortval->type) {
4881 case REDIS_LIST: vectorlen = listLength((list*)sortval->ptr); break;
4882 case REDIS_SET: vectorlen = dictSize((dict*)sortval->ptr); break;
4883 case REDIS_ZSET: vectorlen = dictSize(((zset*)sortval->ptr)->dict); break;
4884 default: vectorlen = 0; redisAssert(0); /* Avoid GCC warning */
4885 }
4886 vector = zmalloc(sizeof(redisSortObject)*vectorlen);
4887 j = 0;
4888
4889 if (sortval->type == REDIS_LIST) {
4890 list *list = sortval->ptr;
4891 listNode *ln;
4892
4893 listRewind(list);
4894 while((ln = listYield(list))) {
4895 robj *ele = ln->value;
4896 vector[j].obj = ele;
4897 vector[j].u.score = 0;
4898 vector[j].u.cmpobj = NULL;
4899 j++;
4900 }
4901 } else {
4902 dict *set;
4903 dictIterator *di;
4904 dictEntry *setele;
4905
4906 if (sortval->type == REDIS_SET) {
4907 set = sortval->ptr;
4908 } else {
4909 zset *zs = sortval->ptr;
4910 set = zs->dict;
4911 }
4912
4913 di = dictGetIterator(set);
4914 while((setele = dictNext(di)) != NULL) {
4915 vector[j].obj = dictGetEntryKey(setele);
4916 vector[j].u.score = 0;
4917 vector[j].u.cmpobj = NULL;
4918 j++;
4919 }
4920 dictReleaseIterator(di);
4921 }
4922 redisAssert(j == vectorlen);
4923
4924 /* Now it's time to load the right scores in the sorting vector */
4925 if (dontsort == 0) {
4926 for (j = 0; j < vectorlen; j++) {
4927 if (sortby) {
4928 robj *byval;
4929
4930 byval = lookupKeyByPattern(c->db,sortby,vector[j].obj);
4931 if (!byval || byval->type != REDIS_STRING) continue;
4932 if (alpha) {
4933 vector[j].u.cmpobj = getDecodedObject(byval);
4934 } else {
4935 if (byval->encoding == REDIS_ENCODING_RAW) {
4936 vector[j].u.score = strtod(byval->ptr,NULL);
4937 } else {
4938 /* Don't need to decode the object if it's
4939 * integer-encoded (the only encoding supported) so
4940 * far. We can just cast it */
4941 if (byval->encoding == REDIS_ENCODING_INT) {
4942 vector[j].u.score = (long)byval->ptr;
4943 } else
4944 redisAssert(1 != 1);
4945 }
4946 }
4947 } else {
4948 if (!alpha) {
4949 if (vector[j].obj->encoding == REDIS_ENCODING_RAW)
4950 vector[j].u.score = strtod(vector[j].obj->ptr,NULL);
4951 else {
4952 if (vector[j].obj->encoding == REDIS_ENCODING_INT)
4953 vector[j].u.score = (long) vector[j].obj->ptr;
4954 else
4955 redisAssert(1 != 1);
4956 }
4957 }
4958 }
4959 }
4960 }
4961
4962 /* We are ready to sort the vector... perform a bit of sanity check
4963 * on the LIMIT option too. We'll use a partial version of quicksort. */
4964 start = (limit_start < 0) ? 0 : limit_start;
4965 end = (limit_count < 0) ? vectorlen-1 : start+limit_count-1;
4966 if (start >= vectorlen) {
4967 start = vectorlen-1;
4968 end = vectorlen-2;
4969 }
4970 if (end >= vectorlen) end = vectorlen-1;
4971
4972 if (dontsort == 0) {
4973 server.sort_desc = desc;
4974 server.sort_alpha = alpha;
4975 server.sort_bypattern = sortby ? 1 : 0;
4976 if (sortby && (start != 0 || end != vectorlen-1))
4977 pqsort(vector,vectorlen,sizeof(redisSortObject),sortCompare, start,end);
4978 else
4979 qsort(vector,vectorlen,sizeof(redisSortObject),sortCompare);
4980 }
4981
4982 /* Send command output to the output buffer, performing the specified
4983 * GET/DEL/INCR/DECR operations if any. */
4984 outputlen = getop ? getop*(end-start+1) : end-start+1;
4985 if (storekey == NULL) {
4986 /* STORE option not specified, sent the sorting result to client */
4987 addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",outputlen));
4988 for (j = start; j <= end; j++) {
4989 listNode *ln;
4990 if (!getop) {
4991 addReplyBulkLen(c,vector[j].obj);
4992 addReply(c,vector[j].obj);
4993 addReply(c,shared.crlf);
4994 }
4995 listRewind(operations);
4996 while((ln = listYield(operations))) {
4997 redisSortOperation *sop = ln->value;
4998 robj *val = lookupKeyByPattern(c->db,sop->pattern,
4999 vector[j].obj);
5000
5001 if (sop->type == REDIS_SORT_GET) {
5002 if (!val || val->type != REDIS_STRING) {
5003 addReply(c,shared.nullbulk);
5004 } else {
5005 addReplyBulkLen(c,val);
5006 addReply(c,val);
5007 addReply(c,shared.crlf);
5008 }
5009 } else {
5010 redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
5011 }
5012 }
5013 }
5014 } else {
5015 robj *listObject = createListObject();
5016 list *listPtr = (list*) listObject->ptr;
5017
5018 /* STORE option specified, set the sorting result as a List object */
5019 for (j = start; j <= end; j++) {
5020 listNode *ln;
5021 if (!getop) {
5022 listAddNodeTail(listPtr,vector[j].obj);
5023 incrRefCount(vector[j].obj);
5024 }
5025 listRewind(operations);
5026 while((ln = listYield(operations))) {
5027 redisSortOperation *sop = ln->value;
5028 robj *val = lookupKeyByPattern(c->db,sop->pattern,
5029 vector[j].obj);
5030
5031 if (sop->type == REDIS_SORT_GET) {
5032 if (!val || val->type != REDIS_STRING) {
5033 listAddNodeTail(listPtr,createStringObject("",0));
5034 } else {
5035 listAddNodeTail(listPtr,val);
5036 incrRefCount(val);
5037 }
5038 } else {
5039 redisAssert(sop->type == REDIS_SORT_GET); /* always fails */
5040 }
5041 }
5042 }
5043 if (dictReplace(c->db->dict,storekey,listObject)) {
5044 incrRefCount(storekey);
5045 }
5046 /* Note: we add 1 because the DB is dirty anyway since even if the
5047 * SORT result is empty a new key is set and maybe the old content
5048 * replaced. */
5049 server.dirty += 1+outputlen;
5050 addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",outputlen));
5051 }
5052
5053 /* Cleanup */
5054 decrRefCount(sortval);
5055 listRelease(operations);
5056 for (j = 0; j < vectorlen; j++) {
5057 if (sortby && alpha && vector[j].u.cmpobj)
5058 decrRefCount(vector[j].u.cmpobj);
5059 }
5060 zfree(vector);
5061 }
5062
5063 /* Create the string returned by the INFO command. This is decoupled
5064 * by the INFO command itself as we need to report the same information
5065 * on memory corruption problems. */
5066 static sds genRedisInfoString(void) {
5067 sds info;
5068 time_t uptime = time(NULL)-server.stat_starttime;
5069 int j;
5070
5071 info = sdscatprintf(sdsempty(),
5072 "redis_version:%s\r\n"
5073 "arch_bits:%s\r\n"
5074 "multiplexing_api:%s\r\n"
5075 "uptime_in_seconds:%ld\r\n"
5076 "uptime_in_days:%ld\r\n"
5077 "connected_clients:%d\r\n"
5078 "connected_slaves:%d\r\n"
5079 "used_memory:%zu\r\n"
5080 "changes_since_last_save:%lld\r\n"
5081 "bgsave_in_progress:%d\r\n"
5082 "last_save_time:%ld\r\n"
5083 "total_connections_received:%lld\r\n"
5084 "total_commands_processed:%lld\r\n"
5085 "role:%s\r\n"
5086 ,REDIS_VERSION,
5087 (sizeof(long) == 8) ? "64" : "32",
5088 aeGetApiName(),
5089 uptime,
5090 uptime/(3600*24),
5091 listLength(server.clients)-listLength(server.slaves),
5092 listLength(server.slaves),
5093 server.usedmemory,
5094 server.dirty,
5095 server.bgsavechildpid != -1,
5096 server.lastsave,
5097 server.stat_numconnections,
5098 server.stat_numcommands,
5099 server.masterhost == NULL ? "master" : "slave"
5100 );
5101 if (server.masterhost) {
5102 info = sdscatprintf(info,
5103 "master_host:%s\r\n"
5104 "master_port:%d\r\n"
5105 "master_link_status:%s\r\n"
5106 "master_last_io_seconds_ago:%d\r\n"
5107 ,server.masterhost,
5108 server.masterport,
5109 (server.replstate == REDIS_REPL_CONNECTED) ?
5110 "up" : "down",
5111 server.master ? ((int)(time(NULL)-server.master->lastinteraction)) : -1
5112 );
5113 }
5114 for (j = 0; j < server.dbnum; j++) {
5115 long long keys, vkeys;
5116
5117 keys = dictSize(server.db[j].dict);
5118 vkeys = dictSize(server.db[j].expires);
5119 if (keys || vkeys) {
5120 info = sdscatprintf(info, "db%d:keys=%lld,expires=%lld\r\n",
5121 j, keys, vkeys);
5122 }
5123 }
5124 return info;
5125 }
5126
5127 static void infoCommand(redisClient *c) {
5128 sds info = genRedisInfoString();
5129 addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",
5130 (unsigned long)sdslen(info)));
5131 addReplySds(c,info);
5132 addReply(c,shared.crlf);
5133 }
5134
5135 static void monitorCommand(redisClient *c) {
5136 /* ignore MONITOR if aleady slave or in monitor mode */
5137 if (c->flags & REDIS_SLAVE) return;
5138
5139 c->flags |= (REDIS_SLAVE|REDIS_MONITOR);
5140 c->slaveseldb = 0;
5141 listAddNodeTail(server.monitors,c);
5142 addReply(c,shared.ok);
5143 }
5144
5145 /* ================================= Expire ================================= */
5146 static int removeExpire(redisDb *db, robj *key) {
5147 if (dictDelete(db->expires,key) == DICT_OK) {
5148 return 1;
5149 } else {
5150 return 0;
5151 }
5152 }
5153
5154 static int setExpire(redisDb *db, robj *key, time_t when) {
5155 if (dictAdd(db->expires,key,(void*)when) == DICT_ERR) {
5156 return 0;
5157 } else {
5158 incrRefCount(key);
5159 return 1;
5160 }
5161 }
5162
5163 /* Return the expire time of the specified key, or -1 if no expire
5164 * is associated with this key (i.e. the key is non volatile) */
5165 static time_t getExpire(redisDb *db, robj *key) {
5166 dictEntry *de;
5167
5168 /* No expire? return ASAP */
5169 if (dictSize(db->expires) == 0 ||
5170 (de = dictFind(db->expires,key)) == NULL) return -1;
5171
5172 return (time_t) dictGetEntryVal(de);
5173 }
5174
5175 static int expireIfNeeded(redisDb *db, robj *key) {
5176 time_t when;
5177 dictEntry *de;
5178
5179 /* No expire? return ASAP */
5180 if (dictSize(db->expires) == 0 ||
5181 (de = dictFind(db->expires,key)) == NULL) return 0;
5182
5183 /* Lookup the expire */
5184 when = (time_t) dictGetEntryVal(de);
5185 if (time(NULL) <= when) return 0;
5186
5187 /* Delete the key */
5188 dictDelete(db->expires,key);
5189 return dictDelete(db->dict,key) == DICT_OK;
5190 }
5191
5192 static int deleteIfVolatile(redisDb *db, robj *key) {
5193 dictEntry *de;
5194
5195 /* No expire? return ASAP */
5196 if (dictSize(db->expires) == 0 ||
5197 (de = dictFind(db->expires,key)) == NULL) return 0;
5198
5199 /* Delete the key */
5200 server.dirty++;
5201 dictDelete(db->expires,key);
5202 return dictDelete(db->dict,key) == DICT_OK;
5203 }
5204
5205 static void expireGenericCommand(redisClient *c, robj *key, time_t seconds) {
5206 dictEntry *de;
5207
5208 de = dictFind(c->db->dict,key);
5209 if (de == NULL) {
5210 addReply(c,shared.czero);
5211 return;
5212 }
5213 if (seconds < 0) {
5214 if (deleteKey(c->db,key)) server.dirty++;
5215 addReply(c, shared.cone);
5216 return;
5217 } else {
5218 time_t when = time(NULL)+seconds;
5219 if (setExpire(c->db,key,when)) {
5220 addReply(c,shared.cone);
5221 server.dirty++;
5222 } else {
5223 addReply(c,shared.czero);
5224 }
5225 return;
5226 }
5227 }
5228
5229 static void expireCommand(redisClient *c) {
5230 expireGenericCommand(c,c->argv[1],strtol(c->argv[2]->ptr,NULL,10));
5231 }
5232
5233 static void expireatCommand(redisClient *c) {
5234 expireGenericCommand(c,c->argv[1],strtol(c->argv[2]->ptr,NULL,10)-time(NULL));
5235 }
5236
5237 static void ttlCommand(redisClient *c) {
5238 time_t expire;
5239 int ttl = -1;
5240
5241 expire = getExpire(c->db,c->argv[1]);
5242 if (expire != -1) {
5243 ttl = (int) (expire-time(NULL));
5244 if (ttl < 0) ttl = -1;
5245 }
5246 addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",ttl));
5247 }
5248
5249 /* =============================== Replication ============================= */
5250
5251 static int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
5252 ssize_t nwritten, ret = size;
5253 time_t start = time(NULL);
5254
5255 timeout++;
5256 while(size) {
5257 if (aeWait(fd,AE_WRITABLE,1000) & AE_WRITABLE) {
5258 nwritten = write(fd,ptr,size);
5259 if (nwritten == -1) return -1;
5260 ptr += nwritten;
5261 size -= nwritten;
5262 }
5263 if ((time(NULL)-start) > timeout) {
5264 errno = ETIMEDOUT;
5265 return -1;
5266 }
5267 }
5268 return ret;
5269 }
5270
5271 static int syncRead(int fd, char *ptr, ssize_t size, int timeout) {
5272 ssize_t nread, totread = 0;
5273 time_t start = time(NULL);
5274
5275 timeout++;
5276 while(size) {
5277 if (aeWait(fd,AE_READABLE,1000) & AE_READABLE) {
5278 nread = read(fd,ptr,size);
5279 if (nread == -1) return -1;
5280 ptr += nread;
5281 size -= nread;
5282 totread += nread;
5283 }
5284 if ((time(NULL)-start) > timeout) {
5285 errno = ETIMEDOUT;
5286 return -1;
5287 }
5288 }
5289 return totread;
5290 }
5291
5292 static int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) {
5293 ssize_t nread = 0;
5294
5295 size--;
5296 while(size) {
5297 char c;
5298
5299 if (syncRead(fd,&c,1,timeout) == -1) return -1;
5300 if (c == '\n') {
5301 *ptr = '\0';
5302 if (nread && *(ptr-1) == '\r') *(ptr-1) = '\0';
5303 return nread;
5304 } else {
5305 *ptr++ = c;
5306 *ptr = '\0';
5307 nread++;
5308 }
5309 }
5310 return nread;
5311 }
5312
5313 static void syncCommand(redisClient *c) {
5314 /* ignore SYNC if aleady slave or in monitor mode */
5315 if (c->flags & REDIS_SLAVE) return;
5316
5317 /* SYNC can't be issued when the server has pending data to send to
5318 * the client about already issued commands. We need a fresh reply
5319 * buffer registering the differences between the BGSAVE and the current
5320 * dataset, so that we can copy to other slaves if needed. */
5321 if (listLength(c->reply) != 0) {
5322 addReplySds(c,sdsnew("-ERR SYNC is invalid with pending input\r\n"));
5323 return;
5324 }
5325
5326 redisLog(REDIS_NOTICE,"Slave ask for synchronization");
5327 /* Here we need to check if there is a background saving operation
5328 * in progress, or if it is required to start one */
5329 if (server.bgsavechildpid != -1) {
5330 /* Ok a background save is in progress. Let's check if it is a good
5331 * one for replication, i.e. if there is another slave that is
5332 * registering differences since the server forked to save */
5333 redisClient *slave;
5334 listNode *ln;
5335
5336 listRewind(server.slaves);
5337 while((ln = listYield(server.slaves))) {
5338 slave = ln->value;
5339 if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) break;
5340 }
5341 if (ln) {
5342 /* Perfect, the server is already registering differences for
5343 * another slave. Set the right state, and copy the buffer. */
5344 listRelease(c->reply);
5345 c->reply = listDup(slave->reply);
5346 c->replstate = REDIS_REPL_WAIT_BGSAVE_END;
5347 redisLog(REDIS_NOTICE,"Waiting for end of BGSAVE for SYNC");
5348 } else {
5349 /* No way, we need to wait for the next BGSAVE in order to
5350 * register differences */
5351 c->replstate = REDIS_REPL_WAIT_BGSAVE_START;
5352 redisLog(REDIS_NOTICE,"Waiting for next BGSAVE for SYNC");
5353 }
5354 } else {
5355 /* Ok we don't have a BGSAVE in progress, let's start one */
5356 redisLog(REDIS_NOTICE,"Starting BGSAVE for SYNC");
5357 if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
5358 redisLog(REDIS_NOTICE,"Replication failed, can't BGSAVE");
5359 addReplySds(c,sdsnew("-ERR Unalbe to perform background save\r\n"));
5360 return;
5361 }
5362 c->replstate = REDIS_REPL_WAIT_BGSAVE_END;
5363 }
5364 c->repldbfd = -1;
5365 c->flags |= REDIS_SLAVE;
5366 c->slaveseldb = 0;
5367 listAddNodeTail(server.slaves,c);
5368 return;
5369 }
5370
5371 static void sendBulkToSlave(aeEventLoop *el, int fd, void *privdata, int mask) {
5372 redisClient *slave = privdata;
5373 REDIS_NOTUSED(el);
5374 REDIS_NOTUSED(mask);
5375 char buf[REDIS_IOBUF_LEN];
5376 ssize_t nwritten, buflen;
5377
5378 if (slave->repldboff == 0) {
5379 /* Write the bulk write count before to transfer the DB. In theory here
5380 * we don't know how much room there is in the output buffer of the
5381 * socket, but in pratice SO_SNDLOWAT (the minimum count for output
5382 * operations) will never be smaller than the few bytes we need. */
5383 sds bulkcount;
5384
5385 bulkcount = sdscatprintf(sdsempty(),"$%lld\r\n",(unsigned long long)
5386 slave->repldbsize);
5387 if (write(fd,bulkcount,sdslen(bulkcount)) != (signed)sdslen(bulkcount))
5388 {
5389 sdsfree(bulkcount);
5390 freeClient(slave);
5391 return;
5392 }
5393 sdsfree(bulkcount);
5394 }
5395 lseek(slave->repldbfd,slave->repldboff,SEEK_SET);
5396 buflen = read(slave->repldbfd,buf,REDIS_IOBUF_LEN);
5397 if (buflen <= 0) {
5398 redisLog(REDIS_WARNING,"Read error sending DB to slave: %s",
5399 (buflen == 0) ? "premature EOF" : strerror(errno));
5400 freeClient(slave);
5401 return;
5402 }
5403 if ((nwritten = write(fd,buf,buflen)) == -1) {
5404 redisLog(REDIS_DEBUG,"Write error sending DB to slave: %s",
5405 strerror(errno));
5406 freeClient(slave);
5407 return;
5408 }
5409 slave->repldboff += nwritten;
5410 if (slave->repldboff == slave->repldbsize) {
5411 close(slave->repldbfd);
5412 slave->repldbfd = -1;
5413 aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE);
5414 slave->replstate = REDIS_REPL_ONLINE;
5415 if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE,
5416 sendReplyToClient, slave) == AE_ERR) {
5417 freeClient(slave);
5418 return;
5419 }
5420 addReplySds(slave,sdsempty());
5421 redisLog(REDIS_NOTICE,"Synchronization with slave succeeded");
5422 }
5423 }
5424
5425 /* This function is called at the end of every backgrond saving.
5426 * The argument bgsaveerr is REDIS_OK if the background saving succeeded
5427 * otherwise REDIS_ERR is passed to the function.
5428 *
5429 * The goal of this function is to handle slaves waiting for a successful
5430 * background saving in order to perform non-blocking synchronization. */
5431 static void updateSlavesWaitingBgsave(int bgsaveerr) {
5432 listNode *ln;
5433 int startbgsave = 0;
5434
5435 listRewind(server.slaves);
5436 while((ln = listYield(server.slaves))) {
5437 redisClient *slave = ln->value;
5438
5439 if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START) {
5440 startbgsave = 1;
5441 slave->replstate = REDIS_REPL_WAIT_BGSAVE_END;
5442 } else if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) {
5443 struct redis_stat buf;
5444
5445 if (bgsaveerr != REDIS_OK) {
5446 freeClient(slave);
5447 redisLog(REDIS_WARNING,"SYNC failed. BGSAVE child returned an error");
5448 continue;
5449 }
5450 if ((slave->repldbfd = open(server.dbfilename,O_RDONLY)) == -1 ||
5451 redis_fstat(slave->repldbfd,&buf) == -1) {
5452 freeClient(slave);
5453 redisLog(REDIS_WARNING,"SYNC failed. Can't open/stat DB after BGSAVE: %s", strerror(errno));
5454 continue;
5455 }
5456 slave->repldboff = 0;
5457 slave->repldbsize = buf.st_size;
5458 slave->replstate = REDIS_REPL_SEND_BULK;
5459 aeDeleteFileEvent(server.el,slave->fd,AE_WRITABLE);
5460 if (aeCreateFileEvent(server.el, slave->fd, AE_WRITABLE, sendBulkToSlave, slave) == AE_ERR) {
5461 freeClient(slave);
5462 continue;
5463 }
5464 }
5465 }
5466 if (startbgsave) {
5467 if (rdbSaveBackground(server.dbfilename) != REDIS_OK) {
5468 listRewind(server.slaves);
5469 redisLog(REDIS_WARNING,"SYNC failed. BGSAVE failed");
5470 while((ln = listYield(server.slaves))) {
5471 redisClient *slave = ln->value;
5472
5473 if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_START)
5474 freeClient(slave);
5475 }
5476 }
5477 }
5478 }
5479
5480 static int syncWithMaster(void) {
5481 char buf[1024], tmpfile[256], authcmd[1024];
5482 int dumpsize;
5483 int fd = anetTcpConnect(NULL,server.masterhost,server.masterport);
5484 int dfd;
5485
5486 if (fd == -1) {
5487 redisLog(REDIS_WARNING,"Unable to connect to MASTER: %s",
5488 strerror(errno));
5489 return REDIS_ERR;
5490 }
5491
5492 /* AUTH with the master if required. */
5493 if(server.masterauth) {
5494 snprintf(authcmd, 1024, "AUTH %s\r\n", server.masterauth);
5495 if (syncWrite(fd, authcmd, strlen(server.masterauth)+7, 5) == -1) {
5496 close(fd);
5497 redisLog(REDIS_WARNING,"Unable to AUTH to MASTER: %s",
5498 strerror(errno));
5499 return REDIS_ERR;
5500 }
5501 /* Read the AUTH result. */
5502 if (syncReadLine(fd,buf,1024,3600) == -1) {
5503 close(fd);
5504 redisLog(REDIS_WARNING,"I/O error reading auth result from MASTER: %s",
5505 strerror(errno));
5506 return REDIS_ERR;
5507 }
5508 if (buf[0] != '+') {
5509 close(fd);
5510 redisLog(REDIS_WARNING,"Cannot AUTH to MASTER, is the masterauth password correct?");
5511 return REDIS_ERR;
5512 }
5513 }
5514
5515 /* Issue the SYNC command */
5516 if (syncWrite(fd,"SYNC \r\n",7,5) == -1) {
5517 close(fd);
5518 redisLog(REDIS_WARNING,"I/O error writing to MASTER: %s",
5519 strerror(errno));
5520 return REDIS_ERR;
5521 }
5522 /* Read the bulk write count */
5523 if (syncReadLine(fd,buf,1024,3600) == -1) {
5524 close(fd);
5525 redisLog(REDIS_WARNING,"I/O error reading bulk count from MASTER: %s",
5526 strerror(errno));
5527 return REDIS_ERR;
5528 }
5529 if (buf[0] != '$') {
5530 close(fd);
5531 redisLog(REDIS_WARNING,"Bad protocol from MASTER, the first byte is not '$', are you sure the host and port are right?");
5532 return REDIS_ERR;
5533 }
5534 dumpsize = atoi(buf+1);
5535 redisLog(REDIS_NOTICE,"Receiving %d bytes data dump from MASTER",dumpsize);
5536 /* Read the bulk write data on a temp file */
5537 snprintf(tmpfile,256,"temp-%d.%ld.rdb",(int)time(NULL),(long int)random());
5538 dfd = open(tmpfile,O_CREAT|O_WRONLY,0644);
5539 if (dfd == -1) {
5540 close(fd);
5541 redisLog(REDIS_WARNING,"Opening the temp file needed for MASTER <-> SLAVE synchronization: %s",strerror(errno));
5542 return REDIS_ERR;
5543 }
5544 while(dumpsize) {
5545 int nread, nwritten;
5546
5547 nread = read(fd,buf,(dumpsize < 1024)?dumpsize:1024);
5548 if (nread == -1) {
5549 redisLog(REDIS_WARNING,"I/O error trying to sync with MASTER: %s",
5550 strerror(errno));
5551 close(fd);
5552 close(dfd);
5553 return REDIS_ERR;
5554 }
5555 nwritten = write(dfd,buf,nread);
5556 if (nwritten == -1) {
5557 redisLog(REDIS_WARNING,"Write error writing to the DB dump file needed for MASTER <-> SLAVE synchrnonization: %s", strerror(errno));
5558 close(fd);
5559 close(dfd);
5560 return REDIS_ERR;
5561 }
5562 dumpsize -= nread;
5563 }
5564 close(dfd);
5565 if (rename(tmpfile,server.dbfilename) == -1) {
5566 redisLog(REDIS_WARNING,"Failed trying to rename the temp DB into dump.rdb in MASTER <-> SLAVE synchronization: %s", strerror(errno));
5567 unlink(tmpfile);
5568 close(fd);
5569 return REDIS_ERR;
5570 }
5571 emptyDb();
5572 if (rdbLoad(server.dbfilename) != REDIS_OK) {
5573 redisLog(REDIS_WARNING,"Failed trying to load the MASTER synchronization DB from disk");
5574 close(fd);
5575 return REDIS_ERR;
5576 }
5577 server.master = createClient(fd);
5578 server.master->flags |= REDIS_MASTER;
5579 server.replstate = REDIS_REPL_CONNECTED;
5580 return REDIS_OK;
5581 }
5582
5583 static void slaveofCommand(redisClient *c) {
5584 if (!strcasecmp(c->argv[1]->ptr,"no") &&
5585 !strcasecmp(c->argv[2]->ptr,"one")) {
5586 if (server.masterhost) {
5587 sdsfree(server.masterhost);
5588 server.masterhost = NULL;
5589 if (server.master) freeClient(server.master);
5590 server.replstate = REDIS_REPL_NONE;
5591 redisLog(REDIS_NOTICE,"MASTER MODE enabled (user request)");
5592 }
5593 } else {
5594 sdsfree(server.masterhost);
5595 server.masterhost = sdsdup(c->argv[1]->ptr);
5596 server.masterport = atoi(c->argv[2]->ptr);
5597 if (server.master) freeClient(server.master);
5598 server.replstate = REDIS_REPL_CONNECT;
5599 redisLog(REDIS_NOTICE,"SLAVE OF %s:%d enabled (user request)",
5600 server.masterhost, server.masterport);
5601 }
5602 addReply(c,shared.ok);
5603 }
5604
5605 /* ============================ Maxmemory directive ======================== */
5606
5607 /* This function gets called when 'maxmemory' is set on the config file to limit
5608 * the max memory used by the server, and we are out of memory.
5609 * This function will try to, in order:
5610 *
5611 * - Free objects from the free list
5612 * - Try to remove keys with an EXPIRE set
5613 *
5614 * It is not possible to free enough memory to reach used-memory < maxmemory
5615 * the server will start refusing commands that will enlarge even more the
5616 * memory usage.
5617 */
5618 static void freeMemoryIfNeeded(void) {
5619 while (server.maxmemory && zmalloc_used_memory() > server.maxmemory) {
5620 if (listLength(server.objfreelist)) {
5621 robj *o;
5622
5623 listNode *head = listFirst(server.objfreelist);
5624 o = listNodeValue(head);
5625 listDelNode(server.objfreelist,head);
5626 zfree(o);
5627 } else {
5628 int j, k, freed = 0;
5629
5630 for (j = 0; j < server.dbnum; j++) {
5631 int minttl = -1;
5632 robj *minkey = NULL;
5633 struct dictEntry *de;
5634
5635 if (dictSize(server.db[j].expires)) {
5636 freed = 1;
5637 /* From a sample of three keys drop the one nearest to
5638 * the natural expire */
5639 for (k = 0; k < 3; k++) {
5640 time_t t;
5641
5642 de = dictGetRandomKey(server.db[j].expires);
5643 t = (time_t) dictGetEntryVal(de);
5644 if (minttl == -1 || t < minttl) {
5645 minkey = dictGetEntryKey(de);
5646 minttl = t;
5647 }
5648 }
5649 deleteKey(server.db+j,minkey);
5650 }
5651 }
5652 if (!freed) return; /* nothing to free... */
5653 }
5654 }
5655 }
5656
5657 /* ============================== Append Only file ========================== */
5658
5659 static void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc) {
5660 sds buf = sdsempty();
5661 int j;
5662 ssize_t nwritten;
5663 time_t now;
5664 robj *tmpargv[3];
5665
5666 /* The DB this command was targetting is not the same as the last command
5667 * we appendend. To issue a SELECT command is needed. */
5668 if (dictid != server.appendseldb) {
5669 char seldb[64];
5670
5671 snprintf(seldb,sizeof(seldb),"%d",dictid);
5672 buf = sdscatprintf(buf,"*2\r\n$6\r\nSELECT\r\n$%lu\r\n%s\r\n",
5673 (unsigned long)strlen(seldb),seldb);
5674 server.appendseldb = dictid;
5675 }
5676
5677 /* "Fix" the argv vector if the command is EXPIRE. We want to translate
5678 * EXPIREs into EXPIREATs calls */
5679 if (cmd->proc == expireCommand) {
5680 long when;
5681
5682 tmpargv[0] = createStringObject("EXPIREAT",8);
5683 tmpargv[1] = argv[1];
5684 incrRefCount(argv[1]);
5685 when = time(NULL)+strtol(argv[2]->ptr,NULL,10);
5686 tmpargv[2] = createObject(REDIS_STRING,
5687 sdscatprintf(sdsempty(),"%ld",when));
5688 argv = tmpargv;
5689 }
5690
5691 /* Append the actual command */
5692 buf = sdscatprintf(buf,"*%d\r\n",argc);
5693 for (j = 0; j < argc; j++) {
5694 robj *o = argv[j];
5695
5696 o = getDecodedObject(o);
5697 buf = sdscatprintf(buf,"$%lu\r\n",(unsigned long)sdslen(o->ptr));
5698 buf = sdscatlen(buf,o->ptr,sdslen(o->ptr));
5699 buf = sdscatlen(buf,"\r\n",2);
5700 decrRefCount(o);
5701 }
5702
5703 /* Free the objects from the modified argv for EXPIREAT */
5704 if (cmd->proc == expireCommand) {
5705 for (j = 0; j < 3; j++)
5706 decrRefCount(argv[j]);
5707 }
5708
5709 /* We want to perform a single write. This should be guaranteed atomic
5710 * at least if the filesystem we are writing is a real physical one.
5711 * While this will save us against the server being killed I don't think
5712 * there is much to do about the whole server stopping for power problems
5713 * or alike */
5714 nwritten = write(server.appendfd,buf,sdslen(buf));
5715 if (nwritten != (signed)sdslen(buf)) {
5716 /* Ooops, we are in troubles. The best thing to do for now is
5717 * to simply exit instead to give the illusion that everything is
5718 * working as expected. */
5719 if (nwritten == -1) {
5720 redisLog(REDIS_WARNING,"Exiting on error writing to the append-only file: %s",strerror(errno));
5721 } else {
5722 redisLog(REDIS_WARNING,"Exiting on short write while writing to the append-only file: %s",strerror(errno));
5723 }
5724 exit(1);
5725 }
5726 /* If a background append only file rewriting is in progress we want to
5727 * accumulate the differences between the child DB and the current one
5728 * in a buffer, so that when the child process will do its work we
5729 * can append the differences to the new append only file. */
5730 if (server.bgrewritechildpid != -1)
5731 server.bgrewritebuf = sdscatlen(server.bgrewritebuf,buf,sdslen(buf));
5732
5733 sdsfree(buf);
5734 now = time(NULL);
5735 if (server.appendfsync == APPENDFSYNC_ALWAYS ||
5736 (server.appendfsync == APPENDFSYNC_EVERYSEC &&
5737 now-server.lastfsync > 1))
5738 {
5739 fsync(server.appendfd); /* Let's try to get this data on the disk */
5740 server.lastfsync = now;
5741 }
5742 }
5743
5744 /* In Redis commands are always executed in the context of a client, so in
5745 * order to load the append only file we need to create a fake client. */
5746 static struct redisClient *createFakeClient(void) {
5747 struct redisClient *c = zmalloc(sizeof(*c));
5748
5749 selectDb(c,0);
5750 c->fd = -1;
5751 c->querybuf = sdsempty();
5752 c->argc = 0;
5753 c->argv = NULL;
5754 c->flags = 0;
5755 /* We set the fake client as a slave waiting for the synchronization
5756 * so that Redis will not try to send replies to this client. */
5757 c->replstate = REDIS_REPL_WAIT_BGSAVE_START;
5758 c->reply = listCreate();
5759 listSetFreeMethod(c->reply,decrRefCount);
5760 listSetDupMethod(c->reply,dupClientReplyValue);
5761 return c;
5762 }
5763
5764 static void freeFakeClient(struct redisClient *c) {
5765 sdsfree(c->querybuf);
5766 listRelease(c->reply);
5767 zfree(c);
5768 }
5769
5770 /* Replay the append log file. On error REDIS_OK is returned. On non fatal
5771 * error (the append only file is zero-length) REDIS_ERR is returned. On
5772 * fatal error an error message is logged and the program exists. */
5773 int loadAppendOnlyFile(char *filename) {
5774 struct redisClient *fakeClient;
5775 FILE *fp = fopen(filename,"r");
5776 struct redis_stat sb;
5777
5778 if (redis_fstat(fileno(fp),&sb) != -1 && sb.st_size == 0)
5779 return REDIS_ERR;
5780
5781 if (fp == NULL) {
5782 redisLog(REDIS_WARNING,"Fatal error: can't open the append log file for reading: %s",strerror(errno));
5783 exit(1);
5784 }
5785
5786 fakeClient = createFakeClient();
5787 while(1) {
5788 int argc, j;
5789 unsigned long len;
5790 robj **argv;
5791 char buf[128];
5792 sds argsds;
5793 struct redisCommand *cmd;
5794
5795 if (fgets(buf,sizeof(buf),fp) == NULL) {
5796 if (feof(fp))
5797 break;
5798 else
5799 goto readerr;
5800 }
5801 if (buf[0] != '*') goto fmterr;
5802 argc = atoi(buf+1);
5803 argv = zmalloc(sizeof(robj*)*argc);
5804 for (j = 0; j < argc; j++) {
5805 if (fgets(buf,sizeof(buf),fp) == NULL) goto readerr;
5806 if (buf[0] != '$') goto fmterr;
5807 len = strtol(buf+1,NULL,10);
5808 argsds = sdsnewlen(NULL,len);
5809 if (len && fread(argsds,len,1,fp) == 0) goto fmterr;
5810 argv[j] = createObject(REDIS_STRING,argsds);
5811 if (fread(buf,2,1,fp) == 0) goto fmterr; /* discard CRLF */
5812 }
5813
5814 /* Command lookup */
5815 cmd = lookupCommand(argv[0]->ptr);
5816 if (!cmd) {
5817 redisLog(REDIS_WARNING,"Unknown command '%s' reading the append only file", argv[0]->ptr);
5818 exit(1);
5819 }
5820 /* Try object sharing and encoding */
5821 if (server.shareobjects) {
5822 int j;
5823 for(j = 1; j < argc; j++)
5824 argv[j] = tryObjectSharing(argv[j]);
5825 }
5826 if (cmd->flags & REDIS_CMD_BULK)
5827 tryObjectEncoding(argv[argc-1]);
5828 /* Run the command in the context of a fake client */
5829 fakeClient->argc = argc;
5830 fakeClient->argv = argv;
5831 cmd->proc(fakeClient);
5832 /* Discard the reply objects list from the fake client */
5833 while(listLength(fakeClient->reply))
5834 listDelNode(fakeClient->reply,listFirst(fakeClient->reply));
5835 /* Clean up, ready for the next command */
5836 for (j = 0; j < argc; j++) decrRefCount(argv[j]);
5837 zfree(argv);
5838 }
5839 fclose(fp);
5840 freeFakeClient(fakeClient);
5841 return REDIS_OK;
5842
5843 readerr:
5844 if (feof(fp)) {
5845 redisLog(REDIS_WARNING,"Unexpected end of file reading the append only file");
5846 } else {
5847 redisLog(REDIS_WARNING,"Unrecoverable error reading the append only file: %s", strerror(errno));
5848 }
5849 exit(1);
5850 fmterr:
5851 redisLog(REDIS_WARNING,"Bad file format reading the append only file");
5852 exit(1);
5853 }
5854
5855 /* Write an object into a file in the bulk format $<count>\r\n<payload>\r\n */
5856 static int fwriteBulk(FILE *fp, robj *obj) {
5857 char buf[128];
5858 obj = getDecodedObject(obj);
5859 snprintf(buf,sizeof(buf),"$%ld\r\n",(long)sdslen(obj->ptr));
5860 if (fwrite(buf,strlen(buf),1,fp) == 0) goto err;
5861 if (fwrite(obj->ptr,sdslen(obj->ptr),1,fp) == 0) goto err;
5862 if (fwrite("\r\n",2,1,fp) == 0) goto err;
5863 decrRefCount(obj);
5864 return 1;
5865 err:
5866 decrRefCount(obj);
5867 return 0;
5868 }
5869
5870 /* Write a double value in bulk format $<count>\r\n<payload>\r\n */
5871 static int fwriteBulkDouble(FILE *fp, double d) {
5872 char buf[128], dbuf[128];
5873
5874 snprintf(dbuf,sizeof(dbuf),"%.17g\r\n",d);
5875 snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(dbuf)-2);
5876 if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
5877 if (fwrite(dbuf,strlen(dbuf),1,fp) == 0) return 0;
5878 return 1;
5879 }
5880
5881 /* Write a long value in bulk format $<count>\r\n<payload>\r\n */
5882 static int fwriteBulkLong(FILE *fp, long l) {
5883 char buf[128], lbuf[128];
5884
5885 snprintf(lbuf,sizeof(lbuf),"%ld\r\n",l);
5886 snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(lbuf)-2);
5887 if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
5888 if (fwrite(lbuf,strlen(lbuf),1,fp) == 0) return 0;
5889 return 1;
5890 }
5891
5892 /* Write a sequence of commands able to fully rebuild the dataset into
5893 * "filename". Used both by REWRITEAOF and BGREWRITEAOF. */
5894 static int rewriteAppendOnlyFile(char *filename) {
5895 dictIterator *di = NULL;
5896 dictEntry *de;
5897 FILE *fp;
5898 char tmpfile[256];
5899 int j;
5900 time_t now = time(NULL);
5901
5902 /* Note that we have to use a different temp name here compared to the
5903 * one used by rewriteAppendOnlyFileBackground() function. */
5904 snprintf(tmpfile,256,"temp-rewriteaof-%d.aof", (int) getpid());
5905 fp = fopen(tmpfile,"w");
5906 if (!fp) {
5907 redisLog(REDIS_WARNING, "Failed rewriting the append only file: %s", strerror(errno));
5908 return REDIS_ERR;
5909 }
5910 for (j = 0; j < server.dbnum; j++) {
5911 char selectcmd[] = "*2\r\n$6\r\nSELECT\r\n";
5912 redisDb *db = server.db+j;
5913 dict *d = db->dict;
5914 if (dictSize(d) == 0) continue;
5915 di = dictGetIterator(d);
5916 if (!di) {
5917 fclose(fp);
5918 return REDIS_ERR;
5919 }
5920
5921 /* SELECT the new DB */
5922 if (fwrite(selectcmd,sizeof(selectcmd)-1,1,fp) == 0) goto werr;
5923 if (fwriteBulkLong(fp,j) == 0) goto werr;
5924
5925 /* Iterate this DB writing every entry */
5926 while((de = dictNext(di)) != NULL) {
5927 robj *key = dictGetEntryKey(de);
5928 robj *o = dictGetEntryVal(de);
5929 time_t expiretime = getExpire(db,key);
5930
5931 /* Save the key and associated value */
5932 if (o->type == REDIS_STRING) {
5933 /* Emit a SET command */
5934 char cmd[]="*3\r\n$3\r\nSET\r\n";
5935 if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
5936 /* Key and value */
5937 if (fwriteBulk(fp,key) == 0) goto werr;
5938 if (fwriteBulk(fp,o) == 0) goto werr;
5939 } else if (o->type == REDIS_LIST) {
5940 /* Emit the RPUSHes needed to rebuild the list */
5941 list *list = o->ptr;
5942 listNode *ln;
5943
5944 listRewind(list);
5945 while((ln = listYield(list))) {
5946 char cmd[]="*3\r\n$5\r\nRPUSH\r\n";
5947 robj *eleobj = listNodeValue(ln);
5948
5949 if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
5950 if (fwriteBulk(fp,key) == 0) goto werr;
5951 if (fwriteBulk(fp,eleobj) == 0) goto werr;
5952 }
5953 } else if (o->type == REDIS_SET) {
5954 /* Emit the SADDs needed to rebuild the set */
5955 dict *set = o->ptr;
5956 dictIterator *di = dictGetIterator(set);
5957 dictEntry *de;
5958
5959 while((de = dictNext(di)) != NULL) {
5960 char cmd[]="*3\r\n$4\r\nSADD\r\n";
5961 robj *eleobj = dictGetEntryKey(de);
5962
5963 if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
5964 if (fwriteBulk(fp,key) == 0) goto werr;
5965 if (fwriteBulk(fp,eleobj) == 0) goto werr;
5966 }
5967 dictReleaseIterator(di);
5968 } else if (o->type == REDIS_ZSET) {
5969 /* Emit the ZADDs needed to rebuild the sorted set */
5970 zset *zs = o->ptr;
5971 dictIterator *di = dictGetIterator(zs->dict);
5972 dictEntry *de;
5973
5974 while((de = dictNext(di)) != NULL) {
5975 char cmd[]="*4\r\n$4\r\nZADD\r\n";
5976 robj *eleobj = dictGetEntryKey(de);
5977 double *score = dictGetEntryVal(de);
5978
5979 if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
5980 if (fwriteBulk(fp,key) == 0) goto werr;
5981 if (fwriteBulkDouble(fp,*score) == 0) goto werr;
5982 if (fwriteBulk(fp,eleobj) == 0) goto werr;
5983 }
5984 dictReleaseIterator(di);
5985 } else {
5986 redisAssert(0 != 0);
5987 }
5988 /* Save the expire time */
5989 if (expiretime != -1) {
5990 char cmd[]="*3\r\n$6\r\nEXPIRE\r\n";
5991 /* If this key is already expired skip it */
5992 if (expiretime < now) continue;
5993 if (fwrite(cmd,sizeof(cmd)-1,1,fp) == 0) goto werr;
5994 if (fwriteBulk(fp,key) == 0) goto werr;
5995 if (fwriteBulkLong(fp,expiretime) == 0) goto werr;
5996 }
5997 }
5998 dictReleaseIterator(di);
5999 }
6000
6001 /* Make sure data will not remain on the OS's output buffers */
6002 fflush(fp);
6003 fsync(fileno(fp));
6004 fclose(fp);
6005
6006 /* Use RENAME to make sure the DB file is changed atomically only
6007 * if the generate DB file is ok. */
6008 if (rename(tmpfile,filename) == -1) {
6009 redisLog(REDIS_WARNING,"Error moving temp append only file on the final destination: %s", strerror(errno));
6010 unlink(tmpfile);
6011 return REDIS_ERR;
6012 }
6013 redisLog(REDIS_NOTICE,"SYNC append only file rewrite performed");
6014 return REDIS_OK;
6015
6016 werr:
6017 fclose(fp);
6018 unlink(tmpfile);
6019 redisLog(REDIS_WARNING,"Write error writing append only fileon disk: %s", strerror(errno));
6020 if (di) dictReleaseIterator(di);
6021 return REDIS_ERR;
6022 }
6023
6024 /* This is how rewriting of the append only file in background works:
6025 *
6026 * 1) The user calls BGREWRITEAOF
6027 * 2) Redis calls this function, that forks():
6028 * 2a) the child rewrite the append only file in a temp file.
6029 * 2b) the parent accumulates differences in server.bgrewritebuf.
6030 * 3) When the child finished '2a' exists.
6031 * 4) The parent will trap the exit code, if it's OK, will append the
6032 * data accumulated into server.bgrewritebuf into the temp file, and
6033 * finally will rename(2) the temp file in the actual file name.
6034 * The the new file is reopened as the new append only file. Profit!
6035 */
6036 static int rewriteAppendOnlyFileBackground(void) {
6037 pid_t childpid;
6038
6039 if (server.bgrewritechildpid != -1) return REDIS_ERR;
6040 if ((childpid = fork()) == 0) {
6041 /* Child */
6042 char tmpfile[256];
6043 close(server.fd);
6044
6045 snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) getpid());
6046 if (rewriteAppendOnlyFile(tmpfile) == REDIS_OK) {
6047 exit(0);
6048 } else {
6049 exit(1);
6050 }
6051 } else {
6052 /* Parent */
6053 if (childpid == -1) {
6054 redisLog(REDIS_WARNING,
6055 "Can't rewrite append only file in background: fork: %s",
6056 strerror(errno));
6057 return REDIS_ERR;
6058 }
6059 redisLog(REDIS_NOTICE,
6060 "Background append only file rewriting started by pid %d",childpid);
6061 server.bgrewritechildpid = childpid;
6062 /* We set appendseldb to -1 in order to force the next call to the
6063 * feedAppendOnlyFile() to issue a SELECT command, so the differences
6064 * accumulated by the parent into server.bgrewritebuf will start
6065 * with a SELECT statement and it will be safe to merge. */
6066 server.appendseldb = -1;
6067 return REDIS_OK;
6068 }
6069 return REDIS_OK; /* unreached */
6070 }
6071
6072 static void bgrewriteaofCommand(redisClient *c) {
6073 if (server.bgrewritechildpid != -1) {
6074 addReplySds(c,sdsnew("-ERR background append only file rewriting already in progress\r\n"));
6075 return;
6076 }
6077 if (rewriteAppendOnlyFileBackground() == REDIS_OK) {
6078 addReply(c,shared.ok);
6079 } else {
6080 addReply(c,shared.err);
6081 }
6082 }
6083
6084 static void aofRemoveTempFile(pid_t childpid) {
6085 char tmpfile[256];
6086
6087 snprintf(tmpfile,256,"temp-rewriteaof-bg-%d.aof", (int) childpid);
6088 unlink(tmpfile);
6089 }
6090
6091 /* ================================= Debugging ============================== */
6092
6093 static void debugCommand(redisClient *c) {
6094 if (!strcasecmp(c->argv[1]->ptr,"segfault")) {
6095 *((char*)-1) = 'x';
6096 } else if (!strcasecmp(c->argv[1]->ptr,"reload")) {
6097 if (rdbSave(server.dbfilename) != REDIS_OK) {
6098 addReply(c,shared.err);
6099 return;
6100 }
6101 emptyDb();
6102 if (rdbLoad(server.dbfilename) != REDIS_OK) {
6103 addReply(c,shared.err);
6104 return;
6105 }
6106 redisLog(REDIS_WARNING,"DB reloaded by DEBUG RELOAD");
6107 addReply(c,shared.ok);
6108 } else if (!strcasecmp(c->argv[1]->ptr,"object") && c->argc == 3) {
6109 dictEntry *de = dictFind(c->db->dict,c->argv[2]);
6110 robj *key, *val;
6111
6112 if (!de) {
6113 addReply(c,shared.nokeyerr);
6114 return;
6115 }
6116 key = dictGetEntryKey(de);
6117 val = dictGetEntryVal(de);
6118 addReplySds(c,sdscatprintf(sdsempty(),
6119 "+Key at:%p refcount:%d, value at:%p refcount:%d encoding:%d\r\n",
6120 (void*)key, key->refcount, (void*)val, val->refcount,
6121 val->encoding));
6122 } else {
6123 addReplySds(c,sdsnew(
6124 "-ERR Syntax error, try DEBUG [SEGFAULT|OBJECT <key>|RELOAD]\r\n"));
6125 }
6126 }
6127
6128 static void _redisAssert(char *estr) {
6129 redisLog(REDIS_WARNING,"=== ASSERTION FAILED ===");
6130 redisLog(REDIS_WARNING,"==> %s\n",estr);
6131 #ifdef HAVE_BACKTRACE
6132 redisLog(REDIS_WARNING,"(forcing SIGSEGV in order to print the stack trace)");
6133 *((char*)-1) = 'x';
6134 #endif
6135 }
6136
6137 /* =================================== Main! ================================ */
6138
6139 #ifdef __linux__
6140 int linuxOvercommitMemoryValue(void) {
6141 FILE *fp = fopen("/proc/sys/vm/overcommit_memory","r");
6142 char buf[64];
6143
6144 if (!fp) return -1;
6145 if (fgets(buf,64,fp) == NULL) {
6146 fclose(fp);
6147 return -1;
6148 }
6149 fclose(fp);
6150
6151 return atoi(buf);
6152 }
6153
6154 void linuxOvercommitMemoryWarning(void) {
6155 if (linuxOvercommitMemoryValue() == 0) {
6156 redisLog(REDIS_WARNING,"WARNING overcommit_memory is set to 0! Background save may fail under low condition memory. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.");
6157 }
6158 }
6159 #endif /* __linux__ */
6160
6161 static void daemonize(void) {
6162 int fd;
6163 FILE *fp;
6164
6165 if (fork() != 0) exit(0); /* parent exits */
6166 printf("New pid: %d\n", getpid());
6167 setsid(); /* create a new session */
6168
6169 /* Every output goes to /dev/null. If Redis is daemonized but
6170 * the 'logfile' is set to 'stdout' in the configuration file
6171 * it will not log at all. */
6172 if ((fd = open("/dev/null", O_RDWR, 0)) != -1) {
6173 dup2(fd, STDIN_FILENO);
6174 dup2(fd, STDOUT_FILENO);
6175 dup2(fd, STDERR_FILENO);
6176 if (fd > STDERR_FILENO) close(fd);
6177 }
6178 /* Try to write the pid file */
6179 fp = fopen(server.pidfile,"w");
6180 if (fp) {
6181 fprintf(fp,"%d\n",getpid());
6182 fclose(fp);
6183 }
6184 }
6185
6186 int main(int argc, char **argv) {
6187 initServerConfig();
6188 if (argc == 2) {
6189 resetServerSaveParams();
6190 loadServerConfig(argv[1]);
6191 } else if (argc > 2) {
6192 fprintf(stderr,"Usage: ./redis-server [/path/to/redis.conf]\n");
6193 exit(1);
6194 } else {
6195 redisLog(REDIS_WARNING,"Warning: no config file specified, using the default config. In order to specify a config file use 'redis-server /path/to/redis.conf'");
6196 }
6197 if (server.daemonize) daemonize();
6198 initServer();
6199 redisLog(REDIS_NOTICE,"Server started, Redis version " REDIS_VERSION);
6200 #ifdef __linux__
6201 linuxOvercommitMemoryWarning();
6202 #endif
6203 if (server.appendonly) {
6204 if (loadAppendOnlyFile(server.appendfilename) == REDIS_OK)
6205 redisLog(REDIS_NOTICE,"DB loaded from append only file");
6206 } else {
6207 if (rdbLoad(server.dbfilename) == REDIS_OK)
6208 redisLog(REDIS_NOTICE,"DB loaded from disk");
6209 }
6210 if (aeCreateFileEvent(server.el, server.fd, AE_READABLE,
6211 acceptHandler, NULL) == AE_ERR) oom("creating file event");
6212 redisLog(REDIS_NOTICE,"The server is now ready to accept connections on port %d", server.port);
6213 aeMain(server.el);
6214 aeDeleteEventLoop(server.el);
6215 return 0;
6216 }
6217
6218 /* ============================= Backtrace support ========================= */
6219
6220 #ifdef HAVE_BACKTRACE
6221 static char *findFuncName(void *pointer, unsigned long *offset);
6222
6223 static void *getMcontextEip(ucontext_t *uc) {
6224 #if defined(__FreeBSD__)
6225 return (void*) uc->uc_mcontext.mc_eip;
6226 #elif defined(__dietlibc__)
6227 return (void*) uc->uc_mcontext.eip;
6228 #elif defined(__APPLE__) && !defined(MAC_OS_X_VERSION_10_6)
6229 #if __x86_64__
6230 return (void*) uc->uc_mcontext->__ss.__rip;
6231 #else
6232 return (void*) uc->uc_mcontext->__ss.__eip;
6233 #endif
6234 #elif defined(__APPLE__) && defined(MAC_OS_X_VERSION_10_6)
6235 #if defined(_STRUCT_X86_THREAD_STATE64) && !defined(__i386__)
6236 return (void*) uc->uc_mcontext->__ss.__rip;
6237 #else
6238 return (void*) uc->uc_mcontext->__ss.__eip;
6239 #endif
6240 #elif defined(__i386__) || defined(__X86_64__) /* Linux x86 */
6241 return (void*) uc->uc_mcontext.gregs[REG_EIP];
6242 #elif defined(__ia64__) /* Linux IA64 */
6243 return (void*) uc->uc_mcontext.sc_ip;
6244 #else
6245 return NULL;
6246 #endif
6247 }
6248
6249 static void segvHandler(int sig, siginfo_t *info, void *secret) {
6250 void *trace[100];
6251 char **messages = NULL;
6252 int i, trace_size = 0;
6253 unsigned long offset=0;
6254 ucontext_t *uc = (ucontext_t*) secret;
6255 sds infostring;
6256 REDIS_NOTUSED(info);
6257
6258 redisLog(REDIS_WARNING,
6259 "======= Ooops! Redis %s got signal: -%d- =======", REDIS_VERSION, sig);
6260 infostring = genRedisInfoString();
6261 redisLog(REDIS_WARNING, "%s",infostring);
6262 /* It's not safe to sdsfree() the returned string under memory
6263 * corruption conditions. Let it leak as we are going to abort */
6264
6265 trace_size = backtrace(trace, 100);
6266 /* overwrite sigaction with caller's address */
6267 if (getMcontextEip(uc) != NULL) {
6268 trace[1] = getMcontextEip(uc);
6269 }
6270 messages = backtrace_symbols(trace, trace_size);
6271
6272 for (i=1; i<trace_size; ++i) {
6273 char *fn = findFuncName(trace[i], &offset), *p;
6274
6275 p = strchr(messages[i],'+');
6276 if (!fn || (p && ((unsigned long)strtol(p+1,NULL,10)) < offset)) {
6277 redisLog(REDIS_WARNING,"%s", messages[i]);
6278 } else {
6279 redisLog(REDIS_WARNING,"%d redis-server %p %s + %d", i, trace[i], fn, (unsigned int)offset);
6280 }
6281 }
6282 // free(messages); Don't call free() with possibly corrupted memory.
6283 exit(0);
6284 }
6285
6286 static void setupSigSegvAction(void) {
6287 struct sigaction act;
6288
6289 sigemptyset (&act.sa_mask);
6290 /* When the SA_SIGINFO flag is set in sa_flags then sa_sigaction
6291 * is used. Otherwise, sa_handler is used */
6292 act.sa_flags = SA_NODEFER | SA_ONSTACK | SA_RESETHAND | SA_SIGINFO;
6293 act.sa_sigaction = segvHandler;
6294 sigaction (SIGSEGV, &act, NULL);
6295 sigaction (SIGBUS, &act, NULL);
6296 sigaction (SIGFPE, &act, NULL);
6297 sigaction (SIGILL, &act, NULL);
6298 sigaction (SIGBUS, &act, NULL);
6299 return;
6300 }
6301
6302 #include "staticsymbols.h"
6303 /* This function try to convert a pointer into a function name. It's used in
6304 * oreder to provide a backtrace under segmentation fault that's able to
6305 * display functions declared as static (otherwise the backtrace is useless). */
6306 static char *findFuncName(void *pointer, unsigned long *offset){
6307 int i, ret = -1;
6308 unsigned long off, minoff = 0;
6309
6310 /* Try to match against the Symbol with the smallest offset */
6311 for (i=0; symsTable[i].pointer; i++) {
6312 unsigned long lp = (unsigned long) pointer;
6313
6314 if (lp != (unsigned long)-1 && lp >= symsTable[i].pointer) {
6315 off=lp-symsTable[i].pointer;
6316 if (ret < 0 || off < minoff) {
6317 minoff=off;
6318 ret=i;
6319 }
6320 }
6321 }
6322 if (ret == -1) return NULL;
6323 *offset = minoff;
6324 return symsTable[ret].name;
6325 }
6326 #else /* HAVE_BACKTRACE */
6327 static void setupSigSegvAction(void) {
6328 }
6329 #endif /* HAVE_BACKTRACE */
6330
6331
6332
6333 /* The End */
6334
6335
6336
Redis += OpenLDAP MDB