src/redis.h

   1 #ifndef __REDIS_H
   2 #define __REDIS_H
   3
   4 #include "fmacros.h"
   5 #include "config.h"
   6
   7 #if defined(__sun)
   8 #include "solarisfixes.h"
   9 #endif
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15 #include <limits.h>
  16 #include <unistd.h>
  17 #include <errno.h>
  18 #include <inttypes.h>
  19 #include <pthread.h>
  20 #include <syslog.h>
  21 #include <netinet/in.h>
  22 #include <lua.h>
  23 #include <signal.h>
  24
  25 #include "ae.h"      /* Event driven programming library */
  26 #include "sds.h"     /* Dynamic safe strings */
  27 #include "dict.h"    /* Hash tables */
  28 #include "adlist.h"  /* Linked lists */
  29 #include "zmalloc.h" /* total memory usage aware version of malloc/free */
  30 #include "anet.h"    /* Networking the easy way */
  31 #include "ziplist.h" /* Compact list data structure */
  32 #include "intset.h"  /* Compact integer set structure */
  33 #include "version.h" /* Version macro */
  34 #include "util.h"    /* Misc functions useful in many places */
  35
  36 /* Error codes */
  37 #define REDIS_OK                0
  38 #define REDIS_ERR               -1
  39
  40 /* Static server configuration */
  41 #define REDIS_HZ                100     /* Time interrupt calls/sec. */
  42 #define REDIS_SERVERPORT        6379    /* TCP port */
  43 #define REDIS_MAXIDLETIME       0       /* default client timeout: infinite */
  44 #define REDIS_DEFAULT_DBNUM     16
  45 #define REDIS_CONFIGLINE_MAX    1024
  46 #define REDIS_EXPIRELOOKUPS_PER_CRON    10 /* lookup 10 expires per loop */
  47 #define REDIS_EXPIRELOOKUPS_TIME_PERC   25 /* CPU max % for keys collection */
  48 #define REDIS_MAX_WRITE_PER_EVENT (1024*64)
  49 #define REDIS_SHARED_SELECT_CMDS 10
  50 #define REDIS_SHARED_INTEGERS 10000
  51 #define REDIS_SHARED_BULKHDR_LEN 32
  52 #define REDIS_MAX_LOGMSG_LEN    1024 /* Default maximum length of syslog messages */
  53 #define REDIS_AOF_REWRITE_PERC  100
  54 #define REDIS_AOF_REWRITE_MIN_SIZE (1024*1024)
  55 #define REDIS_AOF_REWRITE_ITEMS_PER_CMD 64
  56 #define REDIS_SLOWLOG_LOG_SLOWER_THAN 10000
  57 #define REDIS_SLOWLOG_MAX_LEN 128
  58 #define REDIS_MAX_CLIENTS 10000
  59 #define REDIS_AUTHPASS_MAX_LEN 512
  60
  61 #define REDIS_REPL_TIMEOUT 60
  62 #define REDIS_REPL_PING_SLAVE_PERIOD 10
  63
  64 #define REDIS_RUN_ID_SIZE 40
  65 #define REDIS_OPS_SEC_SAMPLES 16
  66
  67 /* Protocol and I/O related defines */
  68 #define REDIS_MAX_QUERYBUF_LEN  (1024*1024*1024) /* 1GB max query buffer. */
  69 #define REDIS_IOBUF_LEN         (1024*16)  /* Generic I/O buffer size */
  70 #define REDIS_REPLY_CHUNK_BYTES (16*1024) /* 16k output buffer */
  71 #define REDIS_INLINE_MAX_SIZE   (1024*64) /* Max size of inline reads */
  72 #define REDIS_MBULK_BIG_ARG     (1024*32)
  73
  74 /* Hash table parameters */
  75 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
  76
  77 /* Command flags. Please check the command table defined in the redis.c file
  78  * for more information about the meaning of every flag. */
  79 #define REDIS_CMD_WRITE 1                   /* "w" flag */
  80 #define REDIS_CMD_READONLY 2                /* "r" flag */
  81 #define REDIS_CMD_DENYOOM 4                 /* "m" flag */
  82 #define REDIS_CMD_FORCE_REPLICATION 8       /* "f" flag */
  83 #define REDIS_CMD_ADMIN 16                  /* "a" flag */
  84 #define REDIS_CMD_PUBSUB 32                 /* "p" flag */
  85 #define REDIS_CMD_NOSCRIPT  64              /* "s" flag */
  86 #define REDIS_CMD_RANDOM 128                /* "R" flag */
  87 #define REDIS_CMD_SORT_FOR_SCRIPT 256       /* "S" flag */
  88 #define REDIS_CMD_LOADING 512               /* "l" flag */
  89 #define REDIS_CMD_STALE 1024                /* "t" flag */
  90
  91 /* Object types */
  92 #define REDIS_STRING 0
  93 #define REDIS_LIST 1
  94 #define REDIS_SET 2
  95 #define REDIS_ZSET 3
  96 #define REDIS_HASH 4
  97
  98 /* Objects encoding. Some kind of objects like Strings and Hashes can be
  99  * internally represented in multiple ways. The 'encoding' field of the object
 100  * is set to one of this fields for this object. */
 101 #define REDIS_ENCODING_RAW 0     /* Raw representation */
 102 #define REDIS_ENCODING_INT 1     /* Encoded as integer */
 103 #define REDIS_ENCODING_HT 2      /* Encoded as hash table */
 104 #define REDIS_ENCODING_ZIPMAP 3  /* Encoded as zipmap */
 105 #define REDIS_ENCODING_LINKEDLIST 4 /* Encoded as regular linked list */
 106 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
 107 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
 108 #define REDIS_ENCODING_SKIPLIST 7  /* Encoded as skiplist */
 109
 110 /* Defines related to the dump file format. To store 32 bits lengths for short
 111  * keys requires a lot of space, so we check the most significant 2 bits of
 112  * the first byte to interpreter the length:
 113  *
 114  * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
 115  * 01|000000 00000000 =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
 116  * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
 117  * 11|000000 this means: specially encoded object will follow. The six bits
 118  *           number specify the kind of object that follows.
 119  *           See the REDIS_RDB_ENC_* defines.
 120  *
 121  * Lenghts up to 63 are stored using a single byte, most DB keys, and may
 122  * values, will fit inside. */
 123 #define REDIS_RDB_6BITLEN 0
 124 #define REDIS_RDB_14BITLEN 1
 125 #define REDIS_RDB_32BITLEN 2
 126 #define REDIS_RDB_ENCVAL 3
 127 #define REDIS_RDB_LENERR UINT_MAX
 128
 129 /* When a length of a string object stored on disk has the first two bits
 130  * set, the remaining two bits specify a special encoding for the object
 131  * accordingly to the following defines: */
 132 #define REDIS_RDB_ENC_INT8 0        /* 8 bit signed integer */
 133 #define REDIS_RDB_ENC_INT16 1       /* 16 bit signed integer */
 134 #define REDIS_RDB_ENC_INT32 2       /* 32 bit signed integer */
 135 #define REDIS_RDB_ENC_LZF 3         /* string compressed with FASTLZ */
 136
 137 /* AOF states */
 138 #define REDIS_AOF_OFF 0             /* AOF is off */
 139 #define REDIS_AOF_ON 1              /* AOF is on */
 140 #define REDIS_AOF_WAIT_REWRITE 2    /* AOF waits rewrite to start appending */
 141
 142 /* Client flags */
 143 #define REDIS_SLAVE 1       /* This client is a slave server */
 144 #define REDIS_MASTER 2      /* This client is a master server */
 145 #define REDIS_MONITOR 4     /* This client is a slave monitor, see MONITOR */
 146 #define REDIS_MULTI 8       /* This client is in a MULTI context */
 147 #define REDIS_BLOCKED 16    /* The client is waiting in a blocking operation */
 148 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 149 #define REDIS_CLOSE_AFTER_REPLY 128 /* Close after writing entire reply. */
 150 #define REDIS_UNBLOCKED 256 /* This client was unblocked and is stored in
 151                                server.unblocked_clients */
 152 #define REDIS_LUA_CLIENT 512 /* This is a non connected client used by Lua */
 153 #define REDIS_ASKING 1024   /* Client issued the ASKING command */
 154 #define REDIS_CLOSE_ASAP 2048 /* Close this client ASAP */
 155
 156 /* Client request types */
 157 #define REDIS_REQ_INLINE 1
 158 #define REDIS_REQ_MULTIBULK 2
 159
 160 /* Client classes for client limits, currently used only for
 161  * the max-client-output-buffer limit implementation. */
 162 #define REDIS_CLIENT_LIMIT_CLASS_NORMAL 0
 163 #define REDIS_CLIENT_LIMIT_CLASS_SLAVE 1
 164 #define REDIS_CLIENT_LIMIT_CLASS_PUBSUB 2
 165 #define REDIS_CLIENT_LIMIT_NUM_CLASSES 3
 166
 167 /* Slave replication state - slave side */
 168 #define REDIS_REPL_NONE 0 /* No active replication */
 169 #define REDIS_REPL_CONNECT 1 /* Must connect to master */
 170 #define REDIS_REPL_CONNECTING 2 /* Connecting to master */
 171 #define REDIS_REPL_TRANSFER 3 /* Receiving .rdb from master */
 172 #define REDIS_REPL_CONNECTED 4 /* Connected to master */
 173
 174 /* Synchronous read timeout - slave side */
 175 #define REDIS_REPL_SYNCIO_TIMEOUT 5
 176
 177 /* Slave replication state - from the point of view of master
 178  * Note that in SEND_BULK and ONLINE state the slave receives new updates
 179  * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
 180  * to start the next background saving in order to send updates to it. */
 181 #define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
 182 #define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
 183 #define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
 184 #define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
 185
 186 /* List related stuff */
 187 #define REDIS_HEAD 0
 188 #define REDIS_TAIL 1
 189
 190 /* Sort operations */
 191 #define REDIS_SORT_GET 0
 192 #define REDIS_SORT_ASC 1
 193 #define REDIS_SORT_DESC 2
 194 #define REDIS_SORTKEY_MAX 1024
 195
 196 /* Log levels */
 197 #define REDIS_DEBUG 0
 198 #define REDIS_VERBOSE 1
 199 #define REDIS_NOTICE 2
 200 #define REDIS_WARNING 3
 201 #define REDIS_LOG_RAW (1<<10) /* Modifier to log without timestamp */
 202
 203 /* Anti-warning macro... */
 204 #define REDIS_NOTUSED(V) ((void) V)
 205
 206 #define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */
 207 #define ZSKIPLIST_P 0.25      /* Skiplist P = 1/4 */
 208
 209 /* Append only defines */
 210 #define AOF_FSYNC_NO 0
 211 #define AOF_FSYNC_ALWAYS 1
 212 #define AOF_FSYNC_EVERYSEC 2
 213
 214 /* Zip structure related defaults */
 215 #define REDIS_HASH_MAX_ZIPLIST_ENTRIES 512
 216 #define REDIS_HASH_MAX_ZIPLIST_VALUE 64
 217 #define REDIS_LIST_MAX_ZIPLIST_ENTRIES 512
 218 #define REDIS_LIST_MAX_ZIPLIST_VALUE 64
 219 #define REDIS_SET_MAX_INTSET_ENTRIES 512
 220 #define REDIS_ZSET_MAX_ZIPLIST_ENTRIES 128
 221 #define REDIS_ZSET_MAX_ZIPLIST_VALUE 64
 222
 223 /* Sets operations codes */
 224 #define REDIS_OP_UNION 0
 225 #define REDIS_OP_DIFF 1
 226 #define REDIS_OP_INTER 2
 227
 228 /* Redis maxmemory strategies */
 229 #define REDIS_MAXMEMORY_VOLATILE_LRU 0
 230 #define REDIS_MAXMEMORY_VOLATILE_TTL 1
 231 #define REDIS_MAXMEMORY_VOLATILE_RANDOM 2
 232 #define REDIS_MAXMEMORY_ALLKEYS_LRU 3
 233 #define REDIS_MAXMEMORY_ALLKEYS_RANDOM 4
 234 #define REDIS_MAXMEMORY_NO_EVICTION 5
 235
 236 /* Scripting */
 237 #define REDIS_LUA_TIME_LIMIT 5000 /* milliseconds */
 238
 239 /* Units */
 240 #define UNIT_SECONDS 0
 241 #define UNIT_MILLISECONDS 1
 242
 243 /* SHUTDOWN flags */
 244 #define REDIS_SHUTDOWN_SAVE 1       /* Force SAVE on SHUTDOWN even if no save
 245                                        points are configured. */
 246 #define REDIS_SHUTDOWN_NOSAVE 2     /* Don't SAVE on SHUTDOWN. */
 247
 248 /* Command call flags, see call() function */
 249 #define REDIS_CALL_NONE 0
 250 #define REDIS_CALL_SLOWLOG 1
 251 #define REDIS_CALL_STATS 2
 252 #define REDIS_CALL_PROPAGATE 4
 253 #define REDIS_CALL_FULL (REDIS_CALL_SLOWLOG | REDIS_CALL_STATS | REDIS_CALL_PROPAGATE)
 254
 255 /* Command propagation flags, see propagate() function */
 256 #define REDIS_PROPAGATE_NONE 0
 257 #define REDIS_PROPAGATE_AOF 1
 258 #define REDIS_PROPAGATE_REPL 2
 259
 260 /* We can print the stacktrace, so our assert is defined this way: */
 261 #define redisAssertWithInfo(_c,_o,_e) ((_e)?(void)0 : (_redisAssertWithInfo(_c,_o,#_e,__FILE__,__LINE__),_exit(1)))
 262 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
 263 #define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 264
 265 /*-----------------------------------------------------------------------------
 266  * Data types
 267  *----------------------------------------------------------------------------*/
 268
 269 /* A redis object, that is a type able to hold a string / list / set */
 270
 271 /* The actual Redis Object */
 272 #define REDIS_LRU_CLOCK_MAX ((1<<21)-1) /* Max value of obj->lru */
 273 #define REDIS_LRU_CLOCK_RESOLUTION 10 /* LRU clock resolution in seconds */
 274 typedef struct redisObject {
 275     unsigned type:4;
 276     unsigned notused:2;     /* Not used */
 277     unsigned encoding:4;
 278     unsigned lru:22;        /* lru time (relative to server.lruclock) */
 279     int refcount;
 280     void *ptr;
 281 } robj;
 282
 283 /* Macro used to initalize a Redis object allocated on the stack.
 284  * Note that this macro is taken near the structure definition to make sure
 285  * we'll update it when the structure is changed, to avoid bugs like
 286  * bug #85 introduced exactly in this way. */
 287 #define initStaticStringObject(_var,_ptr) do { \
 288     _var.refcount = 1; \
 289     _var.type = REDIS_STRING; \
 290     _var.encoding = REDIS_ENCODING_RAW; \
 291     _var.ptr = _ptr; \
 292 } while(0);
 293
 294 typedef struct redisDb {
 295     dict *dict;                 /* The keyspace for this DB */
 296     dict *expires;              /* Timeout of keys with a timeout set */
 297     dict *blocking_keys;        /* Keys with clients waiting for data (BLPOP) */
 298     dict *watched_keys;         /* WATCHED keys for MULTI/EXEC CAS */
 299     int id;
 300 } redisDb;
 301
 302 /* Client MULTI/EXEC state */
 303 typedef struct multiCmd {
 304     robj **argv;
 305     int argc;
 306     struct redisCommand *cmd;
 307 } multiCmd;
 308
 309 typedef struct multiState {
 310     multiCmd *commands;     /* Array of MULTI commands */
 311     int count;              /* Total number of MULTI commands */
 312 } multiState;
 313
 314 typedef struct blockingState {
 315     robj **keys;            /* The key we are waiting to terminate a blocking
 316                              * operation such as BLPOP. Otherwise NULL. */
 317     int count;              /* Number of blocking keys */
 318     time_t timeout;         /* Blocking operation timeout. If UNIX current time
 319                              * is >= timeout then the operation timed out. */
 320     robj *target;           /* The key that should receive the element,
 321                              * for BRPOPLPUSH. */
 322 } blockingState;
 323
 324 /* With multiplexing we need to take per-clinet state.
 325  * Clients are taken in a liked list. */
 326 typedef struct redisClient {
 327     int fd;
 328     redisDb *db;
 329     int dictid;
 330     sds querybuf;
 331     size_t querybuf_peak;   /* Recent (100ms or more) peak of querybuf size */
 332     int argc;
 333     robj **argv;
 334     struct redisCommand *cmd, *lastcmd;
 335     int reqtype;
 336     int multibulklen;       /* number of multi bulk arguments left to read */
 337     long bulklen;           /* length of bulk argument in multi bulk request */
 338     list *reply;
 339     unsigned long reply_bytes; /* Tot bytes of objects in reply list */
 340     int sentlen;
 341     time_t ctime;           /* Client creation time */
 342     time_t lastinteraction; /* time of the last interaction, used for timeout */
 343     time_t obuf_soft_limit_reached_time;
 344     int flags;              /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ... */
 345     int slaveseldb;         /* slave selected db, if this client is a slave */
 346     int authenticated;      /* when requirepass is non-NULL */
 347     int replstate;          /* replication state if this is a slave */
 348     int repldbfd;           /* replication DB file descriptor */
 349     long repldboff;         /* replication DB file offset */
 350     off_t repldbsize;       /* replication DB file size */
 351     int slave_listening_port; /* As configured with: SLAVECONF listening-port */
 352     multiState mstate;      /* MULTI/EXEC state */
 353     blockingState bpop;   /* blocking state */
 354     list *io_keys;          /* Keys this client is waiting to be loaded from the
 355                              * swap file in order to continue. */
 356     list *watched_keys;     /* Keys WATCHED for MULTI/EXEC CAS */
 357     dict *pubsub_channels;  /* channels a client is interested in (SUBSCRIBE) */
 358     list *pubsub_patterns;  /* patterns a client is interested in (SUBSCRIBE) */
 359
 360     /* Response buffer */
 361     int bufpos;
 362     char buf[REDIS_REPLY_CHUNK_BYTES];
 363 } redisClient;
 364
 365 struct saveparam {
 366     time_t seconds;
 367     int changes;
 368 };
 369
 370 struct sharedObjectsStruct {
 371     robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *cnegone, *pong, *space,
 372     *colon, *nullbulk, *nullmultibulk, *queued,
 373     *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
 374     *outofrangeerr, *noscripterr, *loadingerr, *slowscripterr, *bgsaveerr,
 375     *masterdownerr, *roslaveerr,
 376     *oomerr, *plus, *messagebulk, *pmessagebulk, *subscribebulk,
 377     *unsubscribebulk, *psubscribebulk, *punsubscribebulk, *del, *rpop, *lpop,
 378     *select[REDIS_SHARED_SELECT_CMDS],
 379     *integers[REDIS_SHARED_INTEGERS],
 380     *mbulkhdr[REDIS_SHARED_BULKHDR_LEN], /* "*<value>\r\n" */
 381     *bulkhdr[REDIS_SHARED_BULKHDR_LEN];  /* "$<value>\r\n" */
 382 };
 383
 384 /* ZSETs use a specialized version of Skiplists */
 385 typedef struct zskiplistNode {
 386     robj *obj;
 387     double score;
 388     struct zskiplistNode *backward;
 389     struct zskiplistLevel {
 390         struct zskiplistNode *forward;
 391         unsigned int span;
 392     } level[];
 393 } zskiplistNode;
 394
 395 typedef struct zskiplist {
 396     struct zskiplistNode *header, *tail;
 397     unsigned long length;
 398     int level;
 399 } zskiplist;
 400
 401 typedef struct zset {
 402     dict *dict;
 403     zskiplist *zsl;
 404 } zset;
 405
 406 typedef struct clientBufferLimitsConfig {
 407     unsigned long long hard_limit_bytes;
 408     unsigned long long soft_limit_bytes;
 409     time_t soft_limit_seconds;
 410 } clientBufferLimitsConfig;
 411
 412 /* The redisOp structure defines a Redis Operation, that is an instance of
 413  * a command with an argument vector, database ID, propagation target
 414  * (REDIS_PROPAGATE_*), and command pointer.
 415  *
 416  * Currently only used to additionally propagate more commands to AOF/Replication
 417  * after the propagation of the executed command. */
 418 typedef struct redisOp {
 419     robj **argv;
 420     int argc, dbid, target;
 421     struct redisCommand *cmd;
 422 } redisOp;
 423
 424 /* Defines an array of Redis operations. There is an API to add to this
 425  * structure in a easy way.
 426  *
 427  * redisOpArrayInit();
 428  * redisOpArrayAppend();
 429  * redisOpArrayFree();
 430  */
 431 typedef struct redisOpArray {
 432     redisOp *ops;
 433     int numops;
 434 } redisOpArray;
 435
 436 /*-----------------------------------------------------------------------------
 437  * Redis cluster data structures
 438  *----------------------------------------------------------------------------*/
 439
 440 #define REDIS_CLUSTER_SLOTS 4096
 441 #define REDIS_CLUSTER_OK 0          /* Everything looks ok */
 442 #define REDIS_CLUSTER_FAIL 1        /* The cluster can't work */
 443 #define REDIS_CLUSTER_NEEDHELP 2    /* The cluster works, but needs some help */
 444 #define REDIS_CLUSTER_NAMELEN 40    /* sha1 hex length */
 445 #define REDIS_CLUSTER_PORT_INCR 10000 /* Cluster port = baseport + PORT_INCR */
 446
 447 struct clusterNode;
 448
 449 /* clusterLink encapsulates everything needed to talk with a remote node. */
 450 typedef struct clusterLink {
 451     int fd;                     /* TCP socket file descriptor */
 452     sds sndbuf;                 /* Packet send buffer */
 453     sds rcvbuf;                 /* Packet reception buffer */
 454     struct clusterNode *node;   /* Node related to this link if any, or NULL */
 455 } clusterLink;
 456
 457 /* Node flags */
 458 #define REDIS_NODE_MASTER 1     /* The node is a master */
 459 #define REDIS_NODE_SLAVE 2      /* The node is a slave */
 460 #define REDIS_NODE_PFAIL 4      /* Failure? Need acknowledge */
 461 #define REDIS_NODE_FAIL 8       /* The node is believed to be malfunctioning */
 462 #define REDIS_NODE_MYSELF 16    /* This node is myself */
 463 #define REDIS_NODE_HANDSHAKE 32 /* We have still to exchange the first ping */
 464 #define REDIS_NODE_NOADDR   64  /* We don't know the address of this node */
 465 #define REDIS_NODE_MEET 128     /* Send a MEET message to this node */
 466 #define REDIS_NODE_NULL_NAME "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
 467
 468 struct clusterNode {
 469     char name[REDIS_CLUSTER_NAMELEN]; /* Node name, hex string, sha1-size */
 470     int flags;      /* REDIS_NODE_... */
 471     unsigned char slots[REDIS_CLUSTER_SLOTS/8]; /* slots handled by this node */
 472     int numslaves;  /* Number of slave nodes, if this is a master */
 473     struct clusterNode **slaves; /* pointers to slave nodes */
 474     struct clusterNode *slaveof; /* pointer to the master node */
 475     time_t ping_sent;       /* Unix time we sent latest ping */
 476     time_t pong_received;   /* Unix time we received the pong */
 477     char *configdigest;         /* Configuration digest of this node */
 478     time_t configdigest_ts;     /* Configuration digest timestamp */
 479     char ip[16];                /* Latest known IP address of this node */
 480     int port;                   /* Latest known port of this node */
 481     clusterLink *link;          /* TCP/IP link with this node */
 482 };
 483 typedef struct clusterNode clusterNode;
 484
 485 typedef struct {
 486     char *configfile;
 487     clusterNode *myself;  /* This node */
 488     int state;            /* REDIS_CLUSTER_OK, REDIS_CLUSTER_FAIL, ... */
 489     int node_timeout;
 490     dict *nodes;          /* Hash table of name -> clusterNode structures */
 491     clusterNode *migrating_slots_to[REDIS_CLUSTER_SLOTS];
 492     clusterNode *importing_slots_from[REDIS_CLUSTER_SLOTS];
 493     clusterNode *slots[REDIS_CLUSTER_SLOTS];
 494     zskiplist *slots_to_keys;
 495 } clusterState;
 496
 497 /* Redis cluster messages header */
 498
 499 /* Note that the PING, PONG and MEET messages are actually the same exact
 500  * kind of packet. PONG is the reply to ping, in the extact format as a PING,
 501  * while MEET is a special PING that forces the receiver to add the sender
 502  * as a node (if it is not already in the list). */
 503 #define CLUSTERMSG_TYPE_PING 0          /* Ping */
 504 #define CLUSTERMSG_TYPE_PONG 1          /* Pong (reply to Ping) */
 505 #define CLUSTERMSG_TYPE_MEET 2          /* Meet "let's join" message */
 506 #define CLUSTERMSG_TYPE_FAIL 3          /* Mark node xxx as failing */
 507 #define CLUSTERMSG_TYPE_PUBLISH 4       /* Pub/Sub Publish propatagion */
 508
 509 /* Initially we don't know our "name", but we'll find it once we connect
 510  * to the first node, using the getsockname() function. Then we'll use this
 511  * address for all the next messages. */
 512 typedef struct {
 513     char nodename[REDIS_CLUSTER_NAMELEN];
 514     uint32_t ping_sent;
 515     uint32_t pong_received;
 516     char ip[16];    /* IP address last time it was seen */
 517     uint16_t port;  /* port last time it was seen */
 518     uint16_t flags;
 519     uint32_t notused; /* for 64 bit alignment */
 520 } clusterMsgDataGossip;
 521
 522 typedef struct {
 523     char nodename[REDIS_CLUSTER_NAMELEN];
 524 } clusterMsgDataFail;
 525
 526 typedef struct {
 527     uint32_t channel_len;
 528     uint32_t message_len;
 529     unsigned char bulk_data[8]; /* defined as 8 just for alignment concerns. */
 530 } clusterMsgDataPublish;
 531
 532 union clusterMsgData {
 533     /* PING, MEET and PONG */
 534     struct {
 535         /* Array of N clusterMsgDataGossip structures */
 536         clusterMsgDataGossip gossip[1];
 537     } ping;
 538
 539     /* FAIL */
 540     struct {
 541         clusterMsgDataFail about;
 542     } fail;
 543
 544     /* PUBLISH */
 545     struct {
 546         clusterMsgDataPublish msg;
 547     } publish;
 548 };
 549
 550 typedef struct {
 551     uint32_t totlen;    /* Total length of this message */
 552     uint16_t type;      /* Message type */
 553     uint16_t count;     /* Only used for some kind of messages. */
 554     char sender[REDIS_CLUSTER_NAMELEN]; /* Name of the sender node */
 555     unsigned char myslots[REDIS_CLUSTER_SLOTS/8];
 556     char slaveof[REDIS_CLUSTER_NAMELEN];
 557     char configdigest[32];
 558     uint16_t port;      /* Sender TCP base port */
 559     unsigned char state; /* Cluster state from the POV of the sender */
 560     unsigned char notused[5]; /* Reserved for future use. For alignment. */
 561     union clusterMsgData data;
 562 } clusterMsg;
 563
 564 /*-----------------------------------------------------------------------------
 565  * Global server state
 566  *----------------------------------------------------------------------------*/
 567
 568 struct redisServer {
 569     /* General */
 570     redisDb *db;
 571     dict *commands;             /* Command table hahs table */
 572     aeEventLoop *el;
 573     unsigned lruclock:22;       /* Clock incrementing every minute, for LRU */
 574     unsigned lruclock_padding:10;
 575     int shutdown_asap;          /* SHUTDOWN needed ASAP */
 576     int activerehashing;        /* Incremental rehash in serverCron() */
 577     char *requirepass;          /* Pass for AUTH command, or NULL */
 578     char *pidfile;              /* PID file path */
 579     int arch_bits;              /* 32 or 64 depending on sizeof(long) */
 580     int cronloops;              /* Number of times the cron function run */
 581     char runid[REDIS_RUN_ID_SIZE+1];  /* ID always different at every exec. */
 582     /* Networking */
 583     int port;                   /* TCP listening port */
 584     char *bindaddr;             /* Bind address or NULL */
 585     char *unixsocket;           /* UNIX socket path */
 586     mode_t unixsocketperm;      /* UNIX socket permission */
 587     int ipfd;                   /* TCP socket file descriptor */
 588     int sofd;                   /* Unix socket file descriptor */
 589     int cfd;                    /* Cluster bus lisetning socket */
 590     list *clients;              /* List of active clients */
 591     list *clients_to_close;     /* Clients to close asynchronously */
 592     list *slaves, *monitors;    /* List of slaves and MONITORs */
 593     redisClient *current_client; /* Current client, only used on crash report */
 594     char neterr[ANET_ERR_LEN];  /* Error buffer for anet.c */
 595     /* RDB / AOF loading information */
 596     int loading;                /* We are loading data from disk if true */
 597     off_t loading_total_bytes;
 598     off_t loading_loaded_bytes;
 599     time_t loading_start_time;
 600     /* Fast pointers to often looked up command */
 601     struct redisCommand *delCommand, *multiCommand, *lpushCommand;
 602     /* Fields used only for stats */
 603     time_t stat_starttime;          /* Server start time */
 604     long long stat_numcommands;     /* Number of processed commands */
 605     long long stat_numconnections;  /* Number of connections received */
 606     long long stat_expiredkeys;     /* Number of expired keys */
 607     long long stat_evictedkeys;     /* Number of evicted keys (maxmemory) */
 608     long long stat_keyspace_hits;   /* Number of successful lookups of keys */
 609     long long stat_keyspace_misses; /* Number of failed lookups of keys */
 610     size_t stat_peak_memory;        /* Max used memory record */
 611     long long stat_fork_time;       /* Time needed to perform latets fork() */
 612     long long stat_rejected_conn;   /* Clients rejected because of maxclients */
 613     list *slowlog;                  /* SLOWLOG list of commands */
 614     long long slowlog_entry_id;     /* SLOWLOG current entry ID */
 615     long long slowlog_log_slower_than; /* SLOWLOG time limit (to get logged) */
 616     unsigned long slowlog_max_len;     /* SLOWLOG max number of items logged */
 617     /* The following two are used to track instantaneous "load" in terms
 618      * of operations per second. */
 619     long long ops_sec_last_sample_time; /* Timestamp of last sample (in ms) */
 620     long long ops_sec_last_sample_ops;  /* numcommands in last sample */
 621     long long ops_sec_samples[REDIS_OPS_SEC_SAMPLES];
 622     int ops_sec_idx;
 623     /* Configuration */
 624     int verbosity;                  /* Loglevel in redis.conf */
 625     int maxidletime;                /* Client timeout in seconds */
 626     size_t client_max_querybuf_len; /* Limit for client query buffer length */
 627     int dbnum;                      /* Total number of configured DBs */
 628     int daemonize;                  /* True if running as a daemon */
 629     clientBufferLimitsConfig client_obuf_limits[REDIS_CLIENT_LIMIT_NUM_CLASSES];
 630     /* AOF persistence */
 631     int aof_state;                  /* REDIS_AOF_(ON|OFF|WAIT_REWRITE) */
 632     int aof_fsync;                  /* Kind of fsync() policy */
 633     char *aof_filename;             /* Name of the AOF file */
 634     int aof_no_fsync_on_rewrite;    /* Don't fsync if a rewrite is in prog. */
 635     int aof_rewrite_perc;           /* Rewrite AOF if % growth is > M and... */
 636     off_t aof_rewrite_min_size;     /* the AOF file is at least N bytes. */
 637     off_t aof_rewrite_base_size;    /* AOF size on latest startup or rewrite. */
 638     off_t aof_current_size;         /* AOF current size. */
 639     int aof_rewrite_scheduled;      /* Rewrite once BGSAVE terminates. */
 640     pid_t aof_child_pid;            /* PID if rewriting process */
 641     list *aof_rewrite_buf_blocks;   /* Hold changes during an AOF rewrite. */
 642     sds aof_buf;      /* AOF buffer, written before entering the event loop */
 643     int aof_fd;       /* File descriptor of currently selected AOF file */
 644     int aof_selected_db; /* Currently selected DB in AOF */
 645     time_t aof_flush_postponed_start; /* UNIX time of postponed AOF flush */
 646     time_t aof_last_fsync;            /* UNIX time of last fsync() */
 647     time_t aof_rewrite_time_last;   /* Time used by last AOF rewrite run. */
 648     time_t aof_rewrite_time_start;  /* Current AOF rewrite start time. */
 649     unsigned long aof_delayed_fsync;  /* delayed AOF fsync() counter */
 650     /* RDB persistence */
 651     long long dirty;                /* Changes to DB from the last save */
 652     long long dirty_before_bgsave;  /* Used to restore dirty on failed BGSAVE */
 653     pid_t rdb_child_pid;            /* PID of RDB saving child */
 654     struct saveparam *saveparams;   /* Save points array for RDB */
 655     int saveparamslen;              /* Number of saving points */
 656     char *rdb_filename;             /* Name of RDB file */
 657     int rdb_compression;            /* Use compression in RDB? */
 658     int rdb_checksum;               /* Use RDB checksum? */
 659     time_t lastsave;                /* Unix time of last save succeeede */
 660     time_t rdb_save_time_last;      /* Time used by last RDB save run. */
 661     time_t rdb_save_time_start;     /* Current RDB save start time. */
 662     int lastbgsave_status;          /* REDIS_OK or REDIS_ERR */
 663     int stop_writes_on_bgsave_err;  /* Don't allow writes if can't BGSAVE */
 664     /* Propagation of commands in AOF / replication */
 665     redisOpArray also_propagate;    /* Additional command to propagate. */
 666     /* Logging */
 667     char *logfile;                  /* Path of log file */
 668     int syslog_enabled;             /* Is syslog enabled? */
 669     char *syslog_ident;             /* Syslog ident */
 670     int syslog_facility;            /* Syslog facility */
 671     /* Slave specific fields */
 672     char *masterauth;               /* AUTH with this password with master */
 673     char *masterhost;               /* Hostname of master */
 674     int masterport;                 /* Port of master */
 675     int repl_ping_slave_period;     /* Master pings the salve every N seconds */
 676     int repl_timeout;               /* Timeout after N seconds of master idle */
 677     redisClient *master;     /* Client that is master for this slave */
 678     int repl_syncio_timeout; /* Timeout for synchronous I/O calls */
 679     int repl_state;          /* Replication status if the instance is a slave */
 680     off_t repl_transfer_left;  /* Bytes left reading .rdb  */
 681     int repl_transfer_s;     /* Slave -> Master SYNC socket */
 682     int repl_transfer_fd;    /* Slave -> Master SYNC temp file descriptor */
 683     char *repl_transfer_tmpfile; /* Slave-> master SYNC temp file name */
 684     time_t repl_transfer_lastio; /* Unix time of the latest read, for timeout */
 685     int repl_serve_stale_data; /* Serve stale data when link is down? */
 686     int repl_slave_ro;          /* Slave is read only? */
 687     time_t repl_down_since; /* Unix time at which link with master went down */
 688     /* Limits */
 689     unsigned int maxclients;        /* Max number of simultaneous clients */
 690     unsigned long long maxmemory;   /* Max number of memory bytes to use */
 691     int maxmemory_policy;           /* Policy for key evition */
 692     int maxmemory_samples;          /* Pricision of random sampling */
 693     /* Blocked clients */
 694     unsigned int bpop_blocked_clients; /* Number of clients blocked by lists */
 695     list *unblocked_clients; /* list of clients to unblock before next loop */
 696     /* Sort parameters - qsort_r() is only available under BSD so we
 697      * have to take this state global, in order to pass it to sortCompare() */
 698     int sort_dontsort;
 699     int sort_desc;
 700     int sort_alpha;
 701     int sort_bypattern;
 702     /* Zip structure config, see redis.conf for more information  */
 703     size_t hash_max_ziplist_entries;
 704     size_t hash_max_ziplist_value;
 705     size_t list_max_ziplist_entries;
 706     size_t list_max_ziplist_value;
 707     size_t set_max_intset_entries;
 708     size_t zset_max_ziplist_entries;
 709     size_t zset_max_ziplist_value;
 710     time_t unixtime;        /* Unix time sampled every second. */
 711     /* Pubsub */
 712     dict *pubsub_channels;  /* Map channels to list of subscribed clients */
 713     list *pubsub_patterns;  /* A list of pubsub_patterns */
 714     /* Cluster */
 715     int cluster_enabled;    /* Is cluster enabled? */
 716     clusterState cluster;   /* State of the cluster */
 717     /* Scripting */
 718     lua_State *lua; /* The Lua interpreter. We use just one for all clients */
 719     redisClient *lua_client;   /* The "fake client" to query Redis from Lua */
 720     redisClient *lua_caller;   /* The client running EVAL right now, or NULL */
 721     dict *lua_scripts;         /* A dictionary of SHA1 -> Lua scripts */
 722     long long lua_time_limit;  /* Script timeout in seconds */
 723     long long lua_time_start;  /* Start time of script */
 724     int lua_write_dirty;  /* True if a write command was called during the
 725                              execution of the current script. */
 726     int lua_random_dirty; /* True if a random command was called during the
 727                              execution of the current script. */
 728     int lua_timedout;     /* True if we reached the time limit for script
 729                              execution. */
 730     int lua_kill;         /* Kill the script if true. */
 731     /* Assert & bug reportign */
 732     char *assert_failed;
 733     char *assert_file;
 734     int assert_line;
 735     int bug_report_start; /* True if bug report header was already logged. */
 736     int watchdog_period;  /* Software watchdog period in ms. 0 = off */
 737 };
 738
 739 typedef struct pubsubPattern {
 740     redisClient *client;
 741     robj *pattern;
 742 } pubsubPattern;
 743
 744 typedef void redisCommandProc(redisClient *c);
 745 typedef int *redisGetKeysProc(struct redisCommand *cmd, robj **argv, int argc, int *numkeys, int flags);
 746 struct redisCommand {
 747     char *name;
 748     redisCommandProc *proc;
 749     int arity;
 750     char *sflags; /* Flags as string represenation, one char per flag. */
 751     int flags;    /* The actual flags, obtained from the 'sflags' field. */
 752     /* Use a function to determine keys arguments in a command line.
 753      * Used for Redis Cluster redirect. */
 754     redisGetKeysProc *getkeys_proc;
 755     /* What keys should be loaded in background when calling this command? */
 756     int firstkey; /* The first argument that's a key (0 = no keys) */
 757     int lastkey;  /* THe last argument that's a key */
 758     int keystep;  /* The step between first and last key */
 759     long long microseconds, calls;
 760 };
 761
 762 struct redisFunctionSym {
 763     char *name;
 764     unsigned long pointer;
 765 };
 766
 767 typedef struct _redisSortObject {
 768     robj *obj;
 769     union {
 770         double score;
 771         robj *cmpobj;
 772     } u;
 773 } redisSortObject;
 774
 775 typedef struct _redisSortOperation {
 776     int type;
 777     robj *pattern;
 778 } redisSortOperation;
 779
 780 /* Structure to hold list iteration abstraction. */
 781 typedef struct {
 782     robj *subject;
 783     unsigned char encoding;
 784     unsigned char direction; /* Iteration direction */
 785     unsigned char *zi;
 786     listNode *ln;
 787 } listTypeIterator;
 788
 789 /* Structure for an entry while iterating over a list. */
 790 typedef struct {
 791     listTypeIterator *li;
 792     unsigned char *zi;  /* Entry in ziplist */
 793     listNode *ln;       /* Entry in linked list */
 794 } listTypeEntry;
 795
 796 /* Structure to hold set iteration abstraction. */
 797 typedef struct {
 798     robj *subject;
 799     int encoding;
 800     int ii; /* intset iterator */
 801     dictIterator *di;
 802 } setTypeIterator;
 803
 804 /* Structure to hold hash iteration abstration. Note that iteration over
 805  * hashes involves both fields and values. Because it is possible that
 806  * not both are required, store pointers in the iterator to avoid
 807  * unnecessary memory allocation for fields/values. */
 808 typedef struct {
 809     robj *subject;
 810     int encoding;
 811
 812     unsigned char *fptr, *vptr;
 813
 814     dictIterator *di;
 815     dictEntry *de;
 816 } hashTypeIterator;
 817
 818 #define REDIS_HASH_KEY 1
 819 #define REDIS_HASH_VALUE 2
 820
 821 /*-----------------------------------------------------------------------------
 822  * Extern declarations
 823  *----------------------------------------------------------------------------*/
 824
 825 extern struct redisServer server;
 826 extern struct sharedObjectsStruct shared;
 827 extern dictType setDictType;
 828 extern dictType zsetDictType;
 829 extern dictType clusterNodesDictType;
 830 extern dictType dbDictType;
 831 extern double R_Zero, R_PosInf, R_NegInf, R_Nan;
 832 extern dictType hashDictType;
 833
 834 /*-----------------------------------------------------------------------------
 835  * Functions prototypes
 836  *----------------------------------------------------------------------------*/
 837
 838 /* Utils */
 839 long long ustime(void);
 840 long long mstime(void);
 841 void getRandomHexChars(char *p, unsigned int len);
 842 uint64_t crc64(uint64_t crc, const unsigned char *s, uint64_t l);
 843 void exitFromChild(int retcode);
 844
 845 /* networking.c -- Networking and Client related operations */
 846 redisClient *createClient(int fd);
 847 void closeTimedoutClients(void);
 848 void freeClient(redisClient *c);
 849 void resetClient(redisClient *c);
 850 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
 851 void addReply(redisClient *c, robj *obj);
 852 void *addDeferredMultiBulkLength(redisClient *c);
 853 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);
 854 void addReplySds(redisClient *c, sds s);
 855 void processInputBuffer(redisClient *c);
 856 void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 857 void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 858 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
 859 void addReplyBulk(redisClient *c, robj *obj);
 860 void addReplyBulkCString(redisClient *c, char *s);
 861 void addReplyBulkCBuffer(redisClient *c, void *p, size_t len);
 862 void addReplyBulkLongLong(redisClient *c, long long ll);
 863 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 864 void addReply(redisClient *c, robj *obj);
 865 void addReplySds(redisClient *c, sds s);
 866 void addReplyError(redisClient *c, char *err);
 867 void addReplyStatus(redisClient *c, char *status);
 868 void addReplyDouble(redisClient *c, double d);
 869 void addReplyLongLong(redisClient *c, long long ll);
 870 void addReplyMultiBulkLen(redisClient *c, long length);
 871 void copyClientOutputBuffer(redisClient *dst, redisClient *src);
 872 void *dupClientReplyValue(void *o);
 873 void getClientsMaxBuffers(unsigned long *longest_output_list,
 874                           unsigned long *biggest_input_buffer);
 875 sds getClientInfoString(redisClient *client);
 876 sds getAllClientsInfoString(void);
 877 void rewriteClientCommandVector(redisClient *c, int argc, ...);
 878 void rewriteClientCommandArgument(redisClient *c, int i, robj *newval);
 879 unsigned long getClientOutputBufferMemoryUsage(redisClient *c);
 880 void freeClientsInAsyncFreeQueue(void);
 881 void asyncCloseClientOnOutputBufferLimitReached(redisClient *c);
 882 int getClientLimitClassByName(char *name);
 883 char *getClientLimitClassName(int class);
 884 void flushSlavesOutputBuffers(void);
 885 void disconnectSlaves(void);
 886
 887 #ifdef __GNUC__
 888 void addReplyErrorFormat(redisClient *c, const char *fmt, ...)
 889     __attribute__((format(printf, 2, 3)));
 890 void addReplyStatusFormat(redisClient *c, const char *fmt, ...)
 891     __attribute__((format(printf, 2, 3)));
 892 #else
 893 void addReplyErrorFormat(redisClient *c, const char *fmt, ...);
 894 void addReplyStatusFormat(redisClient *c, const char *fmt, ...);
 895 #endif
 896
 897 /* List data type */
 898 void listTypeTryConversion(robj *subject, robj *value);
 899 void listTypePush(robj *subject, robj *value, int where);
 900 robj *listTypePop(robj *subject, int where);
 901 unsigned long listTypeLength(robj *subject);
 902 listTypeIterator *listTypeInitIterator(robj *subject, long index, unsigned char direction);
 903 void listTypeReleaseIterator(listTypeIterator *li);
 904 int listTypeNext(listTypeIterator *li, listTypeEntry *entry);
 905 robj *listTypeGet(listTypeEntry *entry);
 906 void listTypeInsert(listTypeEntry *entry, robj *value, int where);
 907 int listTypeEqual(listTypeEntry *entry, robj *o);
 908 void listTypeDelete(listTypeEntry *entry);
 909 void listTypeConvert(robj *subject, int enc);
 910 void unblockClientWaitingData(redisClient *c);
 911 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
 912 void popGenericCommand(redisClient *c, int where);
 913
 914 /* MULTI/EXEC/WATCH... */
 915 void unwatchAllKeys(redisClient *c);
 916 void initClientMultiState(redisClient *c);
 917 void freeClientMultiState(redisClient *c);
 918 void queueMultiCommand(redisClient *c);
 919 void touchWatchedKey(redisDb *db, robj *key);
 920 void touchWatchedKeysOnFlush(int dbid);
 921 void discardTransaction(redisClient *c);
 922
 923 /* Redis object implementation */
 924 void decrRefCount(void *o);
 925 void incrRefCount(robj *o);
 926 robj *resetRefCount(robj *obj);
 927 void freeStringObject(robj *o);
 928 void freeListObject(robj *o);
 929 void freeSetObject(robj *o);
 930 void freeZsetObject(robj *o);
 931 void freeHashObject(robj *o);
 932 robj *createObject(int type, void *ptr);
 933 robj *createStringObject(char *ptr, size_t len);
 934 robj *dupStringObject(robj *o);
 935 int isObjectRepresentableAsLongLong(robj *o, long long *llongval);
 936 robj *tryObjectEncoding(robj *o);
 937 robj *getDecodedObject(robj *o);
 938 size_t stringObjectLen(robj *o);
 939 robj *createStringObjectFromLongLong(long long value);
 940 robj *createStringObjectFromLongDouble(long double value);
 941 robj *createListObject(void);
 942 robj *createZiplistObject(void);
 943 robj *createSetObject(void);
 944 robj *createIntsetObject(void);
 945 robj *createHashObject(void);
 946 robj *createZsetObject(void);
 947 robj *createZsetZiplistObject(void);
 948 int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg);
 949 int checkType(redisClient *c, robj *o, int type);
 950 int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg);
 951 int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg);
 952 int getLongLongFromObject(robj *o, long long *target);
 953 int getLongDoubleFromObject(robj *o, long double *target);
 954 int getLongDoubleFromObjectOrReply(redisClient *c, robj *o, long double *target, const char *msg);
 955 char *strEncoding(int encoding);
 956 int compareStringObjects(robj *a, robj *b);
 957 int equalStringObjects(robj *a, robj *b);
 958 unsigned long estimateObjectIdleTime(robj *o);
 959
 960 /* Synchronous I/O with timeout */
 961 ssize_t syncWrite(int fd, char *ptr, ssize_t size, long long timeout);
 962 ssize_t syncRead(int fd, char *ptr, ssize_t size, long long timeout);
 963 ssize_t syncReadLine(int fd, char *ptr, ssize_t size, long long timeout);
 964
 965 /* Replication */
 966 void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
 967 void replicationFeedMonitors(redisClient *c, list *monitors, int dictid, robj **argv, int argc);
 968 void updateSlavesWaitingBgsave(int bgsaveerr);
 969 void replicationCron(void);
 970
 971 /* Generic persistence functions */
 972 void startLoading(FILE *fp);
 973 void loadingProgress(off_t pos);
 974 void stopLoading(void);
 975
 976 /* RDB persistence */
 977 #include "rdb.h"
 978
 979 /* AOF persistence */
 980 void flushAppendOnlyFile(int force);
 981 void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 982 void aofRemoveTempFile(pid_t childpid);
 983 int rewriteAppendOnlyFileBackground(void);
 984 int loadAppendOnlyFile(char *filename);
 985 void stopAppendOnly(void);
 986 int startAppendOnly(void);
 987 void backgroundRewriteDoneHandler(int exitcode, int bysignal);
 988 void aofRewriteBufferReset(void);
 989 unsigned long aofRewriteBufferSize(void);
 990
 991 /* Sorted sets data type */
 992
 993 /* Struct to hold a inclusive/exclusive range spec. */
 994 typedef struct {
 995     double min, max;
 996     int minex, maxex; /* are min or max exclusive? */
 997 } zrangespec;
 998
 999 zskiplist *zslCreate(void);
1000 void zslFree(zskiplist *zsl);
1001 zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
1002 unsigned char *zzlInsert(unsigned char *zl, robj *ele, double score);
1003 int zslDelete(zskiplist *zsl, double score, robj *obj);
1004 zskiplistNode *zslFirstInRange(zskiplist *zsl, zrangespec range);
1005 double zzlGetScore(unsigned char *sptr);
1006 void zzlNext(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
1007 void zzlPrev(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
1008 unsigned int zsetLength(robj *zobj);
1009 void zsetConvert(robj *zobj, int encoding);
1010
1011 /* Core functions */
1012 int freeMemoryIfNeeded(void);
1013 int processCommand(redisClient *c);
1014 void setupSignalHandlers(void);
1015 struct redisCommand *lookupCommand(sds name);
1016 struct redisCommand *lookupCommandByCString(char *s);
1017 void call(redisClient *c, int flags);
1018 void propagate(struct redisCommand *cmd, int dbid, robj **argv, int argc, int flags);
1019 void alsoPropagate(struct redisCommand *cmd, int dbid, robj **argv, int argc, int target);
1020 int prepareForShutdown();
1021 void redisLog(int level, const char *fmt, ...);
1022 void redisLogRaw(int level, const char *msg);
1023 void redisLogFromHandler(int level, const char *msg);
1024 void usage();
1025 void updateDictResizePolicy(void);
1026 int htNeedsResize(dict *dict);
1027 void oom(const char *msg);
1028 void populateCommandTable(void);
1029 void resetCommandTableStats(void);
1030
1031 /* Set data type */
1032 robj *setTypeCreate(robj *value);
1033 int setTypeAdd(robj *subject, robj *value);
1034 int setTypeRemove(robj *subject, robj *value);
1035 int setTypeIsMember(robj *subject, robj *value);
1036 setTypeIterator *setTypeInitIterator(robj *subject);
1037 void setTypeReleaseIterator(setTypeIterator *si);
1038 int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele);
1039 robj *setTypeNextObject(setTypeIterator *si);
1040 int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele);
1041 unsigned long setTypeSize(robj *subject);
1042 void setTypeConvert(robj *subject, int enc);
1043
1044 /* Hash data type */
1045 void hashTypeConvert(robj *o, int enc);
1046 void hashTypeTryConversion(robj *subject, robj **argv, int start, int end);
1047 void hashTypeTryObjectEncoding(robj *subject, robj **o1, robj **o2);
1048 robj *hashTypeGetObject(robj *o, robj *key);
1049 int hashTypeExists(robj *o, robj *key);
1050 int hashTypeSet(robj *o, robj *key, robj *value);
1051 int hashTypeDelete(robj *o, robj *key);
1052 unsigned long hashTypeLength(robj *o);
1053 hashTypeIterator *hashTypeInitIterator(robj *subject);
1054 void hashTypeReleaseIterator(hashTypeIterator *hi);
1055 int hashTypeNext(hashTypeIterator *hi);
1056 void hashTypeCurrentFromZiplist(hashTypeIterator *hi, int what,
1057                                 unsigned char **vstr,
1058                                 unsigned int *vlen,
1059                                 long long *vll);
1060 void hashTypeCurrentFromHashTable(hashTypeIterator *hi, int what, robj **dst);
1061 robj *hashTypeCurrentObject(hashTypeIterator *hi, int what);
1062 robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key);
1063
1064 /* Pub / Sub */
1065 int pubsubUnsubscribeAllChannels(redisClient *c, int notify);
1066 int pubsubUnsubscribeAllPatterns(redisClient *c, int notify);
1067 void freePubsubPattern(void *p);
1068 int listMatchPubsubPattern(void *a, void *b);
1069 int pubsubPublishMessage(robj *channel, robj *message);
1070
1071 /* Configuration */
1072 void loadServerConfig(char *filename, char *options);
1073 void appendServerSaveParams(time_t seconds, int changes);
1074 void resetServerSaveParams();
1075
1076 /* db.c -- Keyspace access API */
1077 int removeExpire(redisDb *db, robj *key);
1078 void propagateExpire(redisDb *db, robj *key);
1079 int expireIfNeeded(redisDb *db, robj *key);
1080 long long getExpire(redisDb *db, robj *key);
1081 void setExpire(redisDb *db, robj *key, long long when);
1082 robj *lookupKey(redisDb *db, robj *key);
1083 robj *lookupKeyRead(redisDb *db, robj *key);
1084 robj *lookupKeyWrite(redisDb *db, robj *key);
1085 robj *lookupKeyReadOrReply(redisClient *c, robj *key, robj *reply);
1086 robj *lookupKeyWriteOrReply(redisClient *c, robj *key, robj *reply);
1087 void dbAdd(redisDb *db, robj *key, robj *val);
1088 void dbOverwrite(redisDb *db, robj *key, robj *val);
1089 void setKey(redisDb *db, robj *key, robj *val);
1090 int dbExists(redisDb *db, robj *key);
1091 robj *dbRandomKey(redisDb *db);
1092 int dbDelete(redisDb *db, robj *key);
1093 long long emptyDb();
1094 int selectDb(redisClient *c, int id);
1095 void signalModifiedKey(redisDb *db, robj *key);
1096 void signalFlushedDb(int dbid);
1097 unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count);
1098
1099 /* API to get key arguments from commands */
1100 #define REDIS_GETKEYS_ALL 0
1101 #define REDIS_GETKEYS_PRELOAD 1
1102 int *getKeysFromCommand(struct redisCommand *cmd, robj **argv, int argc, int *numkeys, int flags);
1103 void getKeysFreeResult(int *result);
1104 int *noPreloadGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
1105 int *renameGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
1106 int *zunionInterGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
1107
1108 /* Cluster */
1109 void clusterInit(void);
1110 unsigned short crc16(const char *buf, int len);
1111 unsigned int keyHashSlot(char *key, int keylen);
1112 clusterNode *createClusterNode(char *nodename, int flags);
1113 int clusterAddNode(clusterNode *node);
1114 void clusterCron(void);
1115 clusterNode *getNodeByQuery(redisClient *c, struct redisCommand *cmd, robj **argv, int argc, int *hashslot, int *ask);
1116 void clusterPropagatePublish(robj *channel, robj *message);
1117
1118 /* Scripting */
1119 void scriptingInit(void);
1120
1121 /* Git SHA1 */
1122 char *redisGitSHA1(void);
1123 char *redisGitDirty(void);
1124
1125 /* Commands prototypes */
1126 void authCommand(redisClient *c);
1127 void pingCommand(redisClient *c);
1128 void echoCommand(redisClient *c);
1129 void setCommand(redisClient *c);
1130 void setnxCommand(redisClient *c);
1131 void setexCommand(redisClient *c);
1132 void psetexCommand(redisClient *c);
1133 void getCommand(redisClient *c);
1134 void delCommand(redisClient *c);
1135 void existsCommand(redisClient *c);
1136 void setbitCommand(redisClient *c);
1137 void getbitCommand(redisClient *c);
1138 void setrangeCommand(redisClient *c);
1139 void getrangeCommand(redisClient *c);
1140 void incrCommand(redisClient *c);
1141 void decrCommand(redisClient *c);
1142 void incrbyCommand(redisClient *c);
1143 void decrbyCommand(redisClient *c);
1144 void incrbyfloatCommand(redisClient *c);
1145 void selectCommand(redisClient *c);
1146 void randomkeyCommand(redisClient *c);
1147 void keysCommand(redisClient *c);
1148 void dbsizeCommand(redisClient *c);
1149 void lastsaveCommand(redisClient *c);
1150 void saveCommand(redisClient *c);
1151 void bgsaveCommand(redisClient *c);
1152 void bgrewriteaofCommand(redisClient *c);
1153 void shutdownCommand(redisClient *c);
1154 void moveCommand(redisClient *c);
1155 void renameCommand(redisClient *c);
1156 void renamenxCommand(redisClient *c);
1157 void lpushCommand(redisClient *c);
1158 void rpushCommand(redisClient *c);
1159 void lpushxCommand(redisClient *c);
1160 void rpushxCommand(redisClient *c);
1161 void linsertCommand(redisClient *c);
1162 void lpopCommand(redisClient *c);
1163 void rpopCommand(redisClient *c);
1164 void llenCommand(redisClient *c);
1165 void lindexCommand(redisClient *c);
1166 void lrangeCommand(redisClient *c);
1167 void ltrimCommand(redisClient *c);
1168 void typeCommand(redisClient *c);
1169 void lsetCommand(redisClient *c);
1170 void saddCommand(redisClient *c);
1171 void sremCommand(redisClient *c);
1172 void smoveCommand(redisClient *c);
1173 void sismemberCommand(redisClient *c);
1174 void scardCommand(redisClient *c);
1175 void spopCommand(redisClient *c);
1176 void srandmemberCommand(redisClient *c);
1177 void sinterCommand(redisClient *c);
1178 void sinterstoreCommand(redisClient *c);
1179 void sunionCommand(redisClient *c);
1180 void sunionstoreCommand(redisClient *c);
1181 void sdiffCommand(redisClient *c);
1182 void sdiffstoreCommand(redisClient *c);
1183 void syncCommand(redisClient *c);
1184 void flushdbCommand(redisClient *c);
1185 void flushallCommand(redisClient *c);
1186 void sortCommand(redisClient *c);
1187 void lremCommand(redisClient *c);
1188 void rpoplpushCommand(redisClient *c);
1189 void infoCommand(redisClient *c);
1190 void mgetCommand(redisClient *c);
1191 void monitorCommand(redisClient *c);
1192 void expireCommand(redisClient *c);
1193 void expireatCommand(redisClient *c);
1194 void pexpireCommand(redisClient *c);
1195 void pexpireatCommand(redisClient *c);
1196 void getsetCommand(redisClient *c);
1197 void ttlCommand(redisClient *c);
1198 void pttlCommand(redisClient *c);
1199 void persistCommand(redisClient *c);
1200 void slaveofCommand(redisClient *c);
1201 void debugCommand(redisClient *c);
1202 void msetCommand(redisClient *c);
1203 void msetnxCommand(redisClient *c);
1204 void zaddCommand(redisClient *c);
1205 void zincrbyCommand(redisClient *c);
1206 void zrangeCommand(redisClient *c);
1207 void zrangebyscoreCommand(redisClient *c);
1208 void zrevrangebyscoreCommand(redisClient *c);
1209 void zcountCommand(redisClient *c);
1210 void zrevrangeCommand(redisClient *c);
1211 void zcardCommand(redisClient *c);
1212 void zremCommand(redisClient *c);
1213 void zscoreCommand(redisClient *c);
1214 void zremrangebyscoreCommand(redisClient *c);
1215 void multiCommand(redisClient *c);
1216 void execCommand(redisClient *c);
1217 void discardCommand(redisClient *c);
1218 void blpopCommand(redisClient *c);
1219 void brpopCommand(redisClient *c);
1220 void brpoplpushCommand(redisClient *c);
1221 void appendCommand(redisClient *c);
1222 void strlenCommand(redisClient *c);
1223 void zrankCommand(redisClient *c);
1224 void zrevrankCommand(redisClient *c);
1225 void hsetCommand(redisClient *c);
1226 void hsetnxCommand(redisClient *c);
1227 void hgetCommand(redisClient *c);
1228 void hmsetCommand(redisClient *c);
1229 void hmgetCommand(redisClient *c);
1230 void hdelCommand(redisClient *c);
1231 void hlenCommand(redisClient *c);
1232 void zremrangebyrankCommand(redisClient *c);
1233 void zunionstoreCommand(redisClient *c);
1234 void zinterstoreCommand(redisClient *c);
1235 void hkeysCommand(redisClient *c);
1236 void hvalsCommand(redisClient *c);
1237 void hgetallCommand(redisClient *c);
1238 void hexistsCommand(redisClient *c);
1239 void configCommand(redisClient *c);
1240 void hincrbyCommand(redisClient *c);
1241 void hincrbyfloatCommand(redisClient *c);
1242 void subscribeCommand(redisClient *c);
1243 void unsubscribeCommand(redisClient *c);
1244 void psubscribeCommand(redisClient *c);
1245 void punsubscribeCommand(redisClient *c);
1246 void publishCommand(redisClient *c);
1247 void watchCommand(redisClient *c);
1248 void unwatchCommand(redisClient *c);
1249 void clusterCommand(redisClient *c);
1250 void restoreCommand(redisClient *c);
1251 void migrateCommand(redisClient *c);
1252 void askingCommand(redisClient *c);
1253 void dumpCommand(redisClient *c);
1254 void objectCommand(redisClient *c);
1255 void clientCommand(redisClient *c);
1256 void evalCommand(redisClient *c);
1257 void evalShaCommand(redisClient *c);
1258 void scriptCommand(redisClient *c);
1259 void timeCommand(redisClient *c);
1260 void bitopCommand(redisClient *c);
1261 void bitcountCommand(redisClient *c);
1262 void replconfCommand(redisClient *c);
1263
1264 #if defined(__GNUC__)
1265 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
1266 void free(void *ptr) __attribute__ ((deprecated));
1267 void *malloc(size_t size) __attribute__ ((deprecated));
1268 void *realloc(void *ptr, size_t size) __attribute__ ((deprecated));
1269 #endif
1270
1271 /* Debugging stuff */
1272 void _redisAssertWithInfo(redisClient *c, robj *o, char *estr, char *file, int line);
1273 void _redisAssert(char *estr, char *file, int line);
1274 void _redisPanic(char *msg, char *file, int line);
1275 void bugReportStart(void);
1276 void redisLogObjectDebugInfo(robj *o);
1277 void sigsegvHandler(int sig, siginfo_t *info, void *secret);
1278 sds genRedisInfoString(char *section);
1279 void enableWatchdog(int period);
1280 void disableWatchdog(void);
1281 void watchdogScheduleSignal(int period);
1282 void redisLogHexDump(int level, char *descr, void *value, size_t len);
1283 #endif