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 #define REDIS_DEFAULT_SLAVE_PRIORITY 100
  61 #define REDIS_REPL_TIMEOUT 60
  62 #define REDIS_REPL_PING_SLAVE_PERIOD 10
  63 #define REDIS_RUN_ID_SIZE 40
  64 #define REDIS_OPS_SEC_SAMPLES 16
  65
  66 /* Protocol and I/O related defines */
  67 #define REDIS_MAX_QUERYBUF_LEN  (1024*1024*1024) /* 1GB max query buffer. */
  68 #define REDIS_IOBUF_LEN         (1024*16)  /* Generic I/O buffer size */
  69 #define REDIS_REPLY_CHUNK_BYTES (16*1024) /* 16k output buffer */
  70 #define REDIS_INLINE_MAX_SIZE   (1024*64) /* Max size of inline reads */
  71 #define REDIS_MBULK_BIG_ARG     (1024*32)
  72
  73 /* Hash table parameters */
  74 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
  75
  76 /* Command flags. Please check the command table defined in the redis.c file
  77  * for more information about the meaning of every flag. */
  78 #define REDIS_CMD_WRITE 1                   /* "w" flag */
  79 #define REDIS_CMD_READONLY 2                /* "r" flag */
  80 #define REDIS_CMD_DENYOOM 4                 /* "m" flag */
  81 #define REDIS_CMD_FORCE_REPLICATION 8       /* "f" flag */
  82 #define REDIS_CMD_ADMIN 16                  /* "a" flag */
  83 #define REDIS_CMD_PUBSUB 32                 /* "p" flag */
  84 #define REDIS_CMD_NOSCRIPT  64              /* "s" flag */
  85 #define REDIS_CMD_RANDOM 128                /* "R" flag */
  86 #define REDIS_CMD_SORT_FOR_SCRIPT 256       /* "S" flag */
  87 #define REDIS_CMD_LOADING 512               /* "l" flag */
  88 #define REDIS_CMD_STALE 1024                /* "t" flag */
  89
  90 /* Object types */
  91 #define REDIS_STRING 0
  92 #define REDIS_LIST 1
  93 #define REDIS_SET 2
  94 #define REDIS_ZSET 3
  95 #define REDIS_HASH 4
  96
  97 /* Objects encoding. Some kind of objects like Strings and Hashes can be
  98  * internally represented in multiple ways. The 'encoding' field of the object
  99  * is set to one of this fields for this object. */
 100 #define REDIS_ENCODING_RAW 0     /* Raw representation */
 101 #define REDIS_ENCODING_INT 1     /* Encoded as integer */
 102 #define REDIS_ENCODING_HT 2      /* Encoded as hash table */
 103 #define REDIS_ENCODING_ZIPMAP 3  /* Encoded as zipmap */
 104 #define REDIS_ENCODING_LINKEDLIST 4 /* Encoded as regular linked list */
 105 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
 106 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
 107 #define REDIS_ENCODING_SKIPLIST 7  /* Encoded as skiplist */
 108
 109 /* Defines related to the dump file format. To store 32 bits lengths for short
 110  * keys requires a lot of space, so we check the most significant 2 bits of
 111  * the first byte to interpreter the length:
 112  *
 113  * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
 114  * 01|000000 00000000 =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
 115  * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
 116  * 11|000000 this means: specially encoded object will follow. The six bits
 117  *           number specify the kind of object that follows.
 118  *           See the REDIS_RDB_ENC_* defines.
 119  *
 120  * Lenghts up to 63 are stored using a single byte, most DB keys, and may
 121  * values, will fit inside. */
 122 #define REDIS_RDB_6BITLEN 0
 123 #define REDIS_RDB_14BITLEN 1
 124 #define REDIS_RDB_32BITLEN 2
 125 #define REDIS_RDB_ENCVAL 3
 126 #define REDIS_RDB_LENERR UINT_MAX
 127
 128 /* When a length of a string object stored on disk has the first two bits
 129  * set, the remaining two bits specify a special encoding for the object
 130  * accordingly to the following defines: */
 131 #define REDIS_RDB_ENC_INT8 0        /* 8 bit signed integer */
 132 #define REDIS_RDB_ENC_INT16 1       /* 16 bit signed integer */
 133 #define REDIS_RDB_ENC_INT32 2       /* 32 bit signed integer */
 134 #define REDIS_RDB_ENC_LZF 3         /* string compressed with FASTLZ */
 135
 136 /* AOF states */
 137 #define REDIS_AOF_OFF 0             /* AOF is off */
 138 #define REDIS_AOF_ON 1              /* AOF is on */
 139 #define REDIS_AOF_WAIT_REWRITE 2    /* AOF waits rewrite to start appending */
 140
 141 /* Client flags */
 142 #define REDIS_SLAVE 1       /* This client is a slave server */
 143 #define REDIS_MASTER 2      /* This client is a master server */
 144 #define REDIS_MONITOR 4     /* This client is a slave monitor, see MONITOR */
 145 #define REDIS_MULTI 8       /* This client is in a MULTI context */
 146 #define REDIS_BLOCKED 16    /* The client is waiting in a blocking operation */
 147 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 148 #define REDIS_CLOSE_AFTER_REPLY 128 /* Close after writing entire reply. */
 149 #define REDIS_UNBLOCKED 256 /* This client was unblocked and is stored in
 150                                server.unblocked_clients */
 151 #define REDIS_LUA_CLIENT 512 /* This is a non connected client used by Lua */
 152 #define REDIS_ASKING 1024   /* Client issued the ASKING command */
 153 #define REDIS_CLOSE_ASAP 2048 /* Close this client ASAP */
 154
 155 /* Client request types */
 156 #define REDIS_REQ_INLINE 1
 157 #define REDIS_REQ_MULTIBULK 2
 158
 159 /* Client classes for client limits, currently used only for
 160  * the max-client-output-buffer limit implementation. */
 161 #define REDIS_CLIENT_LIMIT_CLASS_NORMAL 0
 162 #define REDIS_CLIENT_LIMIT_CLASS_SLAVE 1
 163 #define REDIS_CLIENT_LIMIT_CLASS_PUBSUB 2
 164 #define REDIS_CLIENT_LIMIT_NUM_CLASSES 3
 165
 166 /* Slave replication state - slave side */
 167 #define REDIS_REPL_NONE 0 /* No active replication */
 168 #define REDIS_REPL_CONNECT 1 /* Must connect to master */
 169 #define REDIS_REPL_CONNECTING 2 /* Connecting to master */
 170 #define REDIS_REPL_RECEIVE_PONG 3 /* Wait for PING reply */
 171 #define REDIS_REPL_TRANSFER 4 /* Receiving .rdb from master */
 172 #define REDIS_REPL_CONNECTED 5 /* 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  * Global server state
 438  *----------------------------------------------------------------------------*/
 439
 440 struct redisServer {
 441     /* General */
 442     redisDb *db;
 443     dict *commands;             /* Command table hahs table */
 444     aeEventLoop *el;
 445     unsigned lruclock:22;       /* Clock incrementing every minute, for LRU */
 446     unsigned lruclock_padding:10;
 447     int shutdown_asap;          /* SHUTDOWN needed ASAP */
 448     int activerehashing;        /* Incremental rehash in serverCron() */
 449     char *requirepass;          /* Pass for AUTH command, or NULL */
 450     char *pidfile;              /* PID file path */
 451     int arch_bits;              /* 32 or 64 depending on sizeof(long) */
 452     int cronloops;              /* Number of times the cron function run */
 453     char runid[REDIS_RUN_ID_SIZE+1];  /* ID always different at every exec. */
 454     /* Networking */
 455     int port;                   /* TCP listening port */
 456     char *bindaddr;             /* Bind address or NULL */
 457     char *unixsocket;           /* UNIX socket path */
 458     mode_t unixsocketperm;      /* UNIX socket permission */
 459     int ipfd;                   /* TCP socket file descriptor */
 460     int sofd;                   /* Unix socket file descriptor */
 461     list *clients;              /* List of active clients */
 462     list *clients_to_close;     /* Clients to close asynchronously */
 463     list *slaves, *monitors;    /* List of slaves and MONITORs */
 464     redisClient *current_client; /* Current client, only used on crash report */
 465     char neterr[ANET_ERR_LEN];  /* Error buffer for anet.c */
 466     /* RDB / AOF loading information */
 467     int loading;                /* We are loading data from disk if true */
 468     off_t loading_total_bytes;
 469     off_t loading_loaded_bytes;
 470     time_t loading_start_time;
 471     /* Fast pointers to often looked up command */
 472     struct redisCommand *delCommand, *multiCommand, *lpushCommand;
 473     /* Fields used only for stats */
 474     time_t stat_starttime;          /* Server start time */
 475     long long stat_numcommands;     /* Number of processed commands */
 476     long long stat_numconnections;  /* Number of connections received */
 477     long long stat_expiredkeys;     /* Number of expired keys */
 478     long long stat_evictedkeys;     /* Number of evicted keys (maxmemory) */
 479     long long stat_keyspace_hits;   /* Number of successful lookups of keys */
 480     long long stat_keyspace_misses; /* Number of failed lookups of keys */
 481     size_t stat_peak_memory;        /* Max used memory record */
 482     long long stat_fork_time;       /* Time needed to perform latets fork() */
 483     long long stat_rejected_conn;   /* Clients rejected because of maxclients */
 484     list *slowlog;                  /* SLOWLOG list of commands */
 485     long long slowlog_entry_id;     /* SLOWLOG current entry ID */
 486     long long slowlog_log_slower_than; /* SLOWLOG time limit (to get logged) */
 487     unsigned long slowlog_max_len;     /* SLOWLOG max number of items logged */
 488     /* The following two are used to track instantaneous "load" in terms
 489      * of operations per second. */
 490     long long ops_sec_last_sample_time; /* Timestamp of last sample (in ms) */
 491     long long ops_sec_last_sample_ops;  /* numcommands in last sample */
 492     long long ops_sec_samples[REDIS_OPS_SEC_SAMPLES];
 493     int ops_sec_idx;
 494     /* Configuration */
 495     int verbosity;                  /* Loglevel in redis.conf */
 496     int maxidletime;                /* Client timeout in seconds */
 497     size_t client_max_querybuf_len; /* Limit for client query buffer length */
 498     int dbnum;                      /* Total number of configured DBs */
 499     int daemonize;                  /* True if running as a daemon */
 500     clientBufferLimitsConfig client_obuf_limits[REDIS_CLIENT_LIMIT_NUM_CLASSES];
 501     /* AOF persistence */
 502     int aof_state;                  /* REDIS_AOF_(ON|OFF|WAIT_REWRITE) */
 503     int aof_fsync;                  /* Kind of fsync() policy */
 504     char *aof_filename;             /* Name of the AOF file */
 505     int aof_no_fsync_on_rewrite;    /* Don't fsync if a rewrite is in prog. */
 506     int aof_rewrite_perc;           /* Rewrite AOF if % growth is > M and... */
 507     off_t aof_rewrite_min_size;     /* the AOF file is at least N bytes. */
 508     off_t aof_rewrite_base_size;    /* AOF size on latest startup or rewrite. */
 509     off_t aof_current_size;         /* AOF current size. */
 510     int aof_rewrite_scheduled;      /* Rewrite once BGSAVE terminates. */
 511     pid_t aof_child_pid;            /* PID if rewriting process */
 512     list *aof_rewrite_buf_blocks;   /* Hold changes during an AOF rewrite. */
 513     sds aof_buf;      /* AOF buffer, written before entering the event loop */
 514     int aof_fd;       /* File descriptor of currently selected AOF file */
 515     int aof_selected_db; /* Currently selected DB in AOF */
 516     time_t aof_flush_postponed_start; /* UNIX time of postponed AOF flush */
 517     time_t aof_last_fsync;            /* UNIX time of last fsync() */
 518     time_t aof_rewrite_time_last;   /* Time used by last AOF rewrite run. */
 519     time_t aof_rewrite_time_start;  /* Current AOF rewrite start time. */
 520     int aof_lastbgrewrite_status;   /* REDIS_OK or REDIS_ERR */
 521     unsigned long aof_delayed_fsync;  /* delayed AOF fsync() counter */
 522     /* RDB persistence */
 523     long long dirty;                /* Changes to DB from the last save */
 524     long long dirty_before_bgsave;  /* Used to restore dirty on failed BGSAVE */
 525     pid_t rdb_child_pid;            /* PID of RDB saving child */
 526     struct saveparam *saveparams;   /* Save points array for RDB */
 527     int saveparamslen;              /* Number of saving points */
 528     char *rdb_filename;             /* Name of RDB file */
 529     int rdb_compression;            /* Use compression in RDB? */
 530     int rdb_checksum;               /* Use RDB checksum? */
 531     time_t lastsave;                /* Unix time of last save succeeede */
 532     time_t rdb_save_time_last;      /* Time used by last RDB save run. */
 533     time_t rdb_save_time_start;     /* Current RDB save start time. */
 534     int lastbgsave_status;          /* REDIS_OK or REDIS_ERR */
 535     int stop_writes_on_bgsave_err;  /* Don't allow writes if can't BGSAVE */
 536     /* Propagation of commands in AOF / replication */
 537     redisOpArray also_propagate;    /* Additional command to propagate. */
 538     /* Logging */
 539     char *logfile;                  /* Path of log file */
 540     int syslog_enabled;             /* Is syslog enabled? */
 541     char *syslog_ident;             /* Syslog ident */
 542     int syslog_facility;            /* Syslog facility */
 543     /* Slave specific fields */
 544     char *masterauth;               /* AUTH with this password with master */
 545     char *masterhost;               /* Hostname of master */
 546     int masterport;                 /* Port of master */
 547     int repl_ping_slave_period;     /* Master pings the slave every N seconds */
 548     int repl_timeout;               /* Timeout after N seconds of master idle */
 549     redisClient *master;     /* Client that is master for this slave */
 550     int repl_syncio_timeout; /* Timeout for synchronous I/O calls */
 551     int repl_state;          /* Replication status if the instance is a slave */
 552     off_t repl_transfer_size; /* Size of RDB to read from master during sync. */
 553     off_t repl_transfer_read; /* Amount of RDB read from master during sync. */
 554     off_t repl_transfer_last_fsync_off; /* Offset when we fsync-ed last time. */
 555     int repl_transfer_s;     /* Slave -> Master SYNC socket */
 556     int repl_transfer_fd;    /* Slave -> Master SYNC temp file descriptor */
 557     char *repl_transfer_tmpfile; /* Slave-> master SYNC temp file name */
 558     time_t repl_transfer_lastio; /* Unix time of the latest read, for timeout */
 559     int repl_serve_stale_data; /* Serve stale data when link is down? */
 560     int repl_slave_ro;          /* Slave is read only? */
 561     time_t repl_down_since; /* Unix time at which link with master went down */
 562     int slave_priority;             /* Reported in INFO and used by Sentinel. */
 563     /* Limits */
 564     unsigned int maxclients;        /* Max number of simultaneous clients */
 565     unsigned long long maxmemory;   /* Max number of memory bytes to use */
 566     int maxmemory_policy;           /* Policy for key evition */
 567     int maxmemory_samples;          /* Pricision of random sampling */
 568     /* Blocked clients */
 569     unsigned int bpop_blocked_clients; /* Number of clients blocked by lists */
 570     list *unblocked_clients; /* list of clients to unblock before next loop */
 571     /* Sort parameters - qsort_r() is only available under BSD so we
 572      * have to take this state global, in order to pass it to sortCompare() */
 573     int sort_desc;
 574     int sort_alpha;
 575     int sort_bypattern;
 576     /* Zip structure config, see redis.conf for more information  */
 577     size_t hash_max_ziplist_entries;
 578     size_t hash_max_ziplist_value;
 579     size_t list_max_ziplist_entries;
 580     size_t list_max_ziplist_value;
 581     size_t set_max_intset_entries;
 582     size_t zset_max_ziplist_entries;
 583     size_t zset_max_ziplist_value;
 584     time_t unixtime;        /* Unix time sampled every second. */
 585     /* Pubsub */
 586     dict *pubsub_channels;  /* Map channels to list of subscribed clients */
 587     list *pubsub_patterns;  /* A list of pubsub_patterns */
 588     /* Scripting */
 589     lua_State *lua; /* The Lua interpreter. We use just one for all clients */
 590     redisClient *lua_client;   /* The "fake client" to query Redis from Lua */
 591     redisClient *lua_caller;   /* The client running EVAL right now, or NULL */
 592     dict *lua_scripts;         /* A dictionary of SHA1 -> Lua scripts */
 593     long long lua_time_limit;  /* Script timeout in seconds */
 594     long long lua_time_start;  /* Start time of script */
 595     int lua_write_dirty;  /* True if a write command was called during the
 596                              execution of the current script. */
 597     int lua_random_dirty; /* True if a random command was called during the
 598                              execution of the current script. */
 599     int lua_timedout;     /* True if we reached the time limit for script
 600                              execution. */
 601     int lua_kill;         /* Kill the script if true. */
 602     /* Assert & bug reportign */
 603     char *assert_failed;
 604     char *assert_file;
 605     int assert_line;
 606     int bug_report_start; /* True if bug report header was already logged. */
 607     int watchdog_period;  /* Software watchdog period in ms. 0 = off */
 608 };
 609
 610 typedef struct pubsubPattern {
 611     redisClient *client;
 612     robj *pattern;
 613 } pubsubPattern;
 614
 615 typedef void redisCommandProc(redisClient *c);
 616 typedef int *redisGetKeysProc(struct redisCommand *cmd, robj **argv, int argc, int *numkeys, int flags);
 617 struct redisCommand {
 618     char *name;
 619     redisCommandProc *proc;
 620     int arity;
 621     char *sflags; /* Flags as string represenation, one char per flag. */
 622     int flags;    /* The actual flags, obtained from the 'sflags' field. */
 623     /* Use a function to determine keys arguments in a command line. */
 624     redisGetKeysProc *getkeys_proc;
 625     /* What keys should be loaded in background when calling this command? */
 626     int firstkey; /* The first argument that's a key (0 = no keys) */
 627     int lastkey;  /* THe last argument that's a key */
 628     int keystep;  /* The step between first and last key */
 629     long long microseconds, calls;
 630 };
 631
 632 struct redisFunctionSym {
 633     char *name;
 634     unsigned long pointer;
 635 };
 636
 637 typedef struct _redisSortObject {
 638     robj *obj;
 639     union {
 640         double score;
 641         robj *cmpobj;
 642     } u;
 643 } redisSortObject;
 644
 645 typedef struct _redisSortOperation {
 646     int type;
 647     robj *pattern;
 648 } redisSortOperation;
 649
 650 /* Structure to hold list iteration abstraction. */
 651 typedef struct {
 652     robj *subject;
 653     unsigned char encoding;
 654     unsigned char direction; /* Iteration direction */
 655     unsigned char *zi;
 656     listNode *ln;
 657 } listTypeIterator;
 658
 659 /* Structure for an entry while iterating over a list. */
 660 typedef struct {
 661     listTypeIterator *li;
 662     unsigned char *zi;  /* Entry in ziplist */
 663     listNode *ln;       /* Entry in linked list */
 664 } listTypeEntry;
 665
 666 /* Structure to hold set iteration abstraction. */
 667 typedef struct {
 668     robj *subject;
 669     int encoding;
 670     int ii; /* intset iterator */
 671     dictIterator *di;
 672 } setTypeIterator;
 673
 674 /* Structure to hold hash iteration abstration. Note that iteration over
 675  * hashes involves both fields and values. Because it is possible that
 676  * not both are required, store pointers in the iterator to avoid
 677  * unnecessary memory allocation for fields/values. */
 678 typedef struct {
 679     robj *subject;
 680     int encoding;
 681
 682     unsigned char *fptr, *vptr;
 683
 684     dictIterator *di;
 685     dictEntry *de;
 686 } hashTypeIterator;
 687
 688 #define REDIS_HASH_KEY 1
 689 #define REDIS_HASH_VALUE 2
 690
 691 /*-----------------------------------------------------------------------------
 692  * Extern declarations
 693  *----------------------------------------------------------------------------*/
 694
 695 extern struct redisServer server;
 696 extern struct sharedObjectsStruct shared;
 697 extern dictType setDictType;
 698 extern dictType zsetDictType;
 699 extern dictType dbDictType;
 700 extern double R_Zero, R_PosInf, R_NegInf, R_Nan;
 701 extern dictType hashDictType;
 702
 703 /*-----------------------------------------------------------------------------
 704  * Functions prototypes
 705  *----------------------------------------------------------------------------*/
 706
 707 /* Utils */
 708 long long ustime(void);
 709 long long mstime(void);
 710 void getRandomHexChars(char *p, unsigned int len);
 711 uint64_t crc64(uint64_t crc, const unsigned char *s, uint64_t l);
 712 void exitFromChild(int retcode);
 713
 714 /* networking.c -- Networking and Client related operations */
 715 redisClient *createClient(int fd);
 716 void closeTimedoutClients(void);
 717 void freeClient(redisClient *c);
 718 void resetClient(redisClient *c);
 719 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
 720 void addReply(redisClient *c, robj *obj);
 721 void *addDeferredMultiBulkLength(redisClient *c);
 722 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);
 723 void addReplySds(redisClient *c, sds s);
 724 void processInputBuffer(redisClient *c);
 725 void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 726 void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 727 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
 728 void addReplyBulk(redisClient *c, robj *obj);
 729 void addReplyBulkCString(redisClient *c, char *s);
 730 void addReplyBulkCBuffer(redisClient *c, void *p, size_t len);
 731 void addReplyBulkLongLong(redisClient *c, long long ll);
 732 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 733 void addReply(redisClient *c, robj *obj);
 734 void addReplySds(redisClient *c, sds s);
 735 void addReplyError(redisClient *c, char *err);
 736 void addReplyStatus(redisClient *c, char *status);
 737 void addReplyDouble(redisClient *c, double d);
 738 void addReplyLongLong(redisClient *c, long long ll);
 739 void addReplyMultiBulkLen(redisClient *c, long length);
 740 void copyClientOutputBuffer(redisClient *dst, redisClient *src);
 741 void *dupClientReplyValue(void *o);
 742 void getClientsMaxBuffers(unsigned long *longest_output_list,
 743                           unsigned long *biggest_input_buffer);
 744 sds getClientInfoString(redisClient *client);
 745 sds getAllClientsInfoString(void);
 746 void rewriteClientCommandVector(redisClient *c, int argc, ...);
 747 void rewriteClientCommandArgument(redisClient *c, int i, robj *newval);
 748 unsigned long getClientOutputBufferMemoryUsage(redisClient *c);
 749 void freeClientsInAsyncFreeQueue(void);
 750 void asyncCloseClientOnOutputBufferLimitReached(redisClient *c);
 751 int getClientLimitClassByName(char *name);
 752 char *getClientLimitClassName(int class);
 753 void flushSlavesOutputBuffers(void);
 754 void disconnectSlaves(void);
 755
 756 #ifdef __GNUC__
 757 void addReplyErrorFormat(redisClient *c, const char *fmt, ...)
 758     __attribute__((format(printf, 2, 3)));
 759 void addReplyStatusFormat(redisClient *c, const char *fmt, ...)
 760     __attribute__((format(printf, 2, 3)));
 761 #else
 762 void addReplyErrorFormat(redisClient *c, const char *fmt, ...);
 763 void addReplyStatusFormat(redisClient *c, const char *fmt, ...);
 764 #endif
 765
 766 /* List data type */
 767 void listTypeTryConversion(robj *subject, robj *value);
 768 void listTypePush(robj *subject, robj *value, int where);
 769 robj *listTypePop(robj *subject, int where);
 770 unsigned long listTypeLength(robj *subject);
 771 listTypeIterator *listTypeInitIterator(robj *subject, long index, unsigned char direction);
 772 void listTypeReleaseIterator(listTypeIterator *li);
 773 int listTypeNext(listTypeIterator *li, listTypeEntry *entry);
 774 robj *listTypeGet(listTypeEntry *entry);
 775 void listTypeInsert(listTypeEntry *entry, robj *value, int where);
 776 int listTypeEqual(listTypeEntry *entry, robj *o);
 777 void listTypeDelete(listTypeEntry *entry);
 778 void listTypeConvert(robj *subject, int enc);
 779 void unblockClientWaitingData(redisClient *c);
 780 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
 781 void popGenericCommand(redisClient *c, int where);
 782
 783 /* MULTI/EXEC/WATCH... */
 784 void unwatchAllKeys(redisClient *c);
 785 void initClientMultiState(redisClient *c);
 786 void freeClientMultiState(redisClient *c);
 787 void queueMultiCommand(redisClient *c);
 788 void touchWatchedKey(redisDb *db, robj *key);
 789 void touchWatchedKeysOnFlush(int dbid);
 790 void discardTransaction(redisClient *c);
 791
 792 /* Redis object implementation */
 793 void decrRefCount(void *o);
 794 void incrRefCount(robj *o);
 795 robj *resetRefCount(robj *obj);
 796 void freeStringObject(robj *o);
 797 void freeListObject(robj *o);
 798 void freeSetObject(robj *o);
 799 void freeZsetObject(robj *o);
 800 void freeHashObject(robj *o);
 801 robj *createObject(int type, void *ptr);
 802 robj *createStringObject(char *ptr, size_t len);
 803 robj *dupStringObject(robj *o);
 804 int isObjectRepresentableAsLongLong(robj *o, long long *llongval);
 805 robj *tryObjectEncoding(robj *o);
 806 robj *getDecodedObject(robj *o);
 807 size_t stringObjectLen(robj *o);
 808 robj *createStringObjectFromLongLong(long long value);
 809 robj *createStringObjectFromLongDouble(long double value);
 810 robj *createListObject(void);
 811 robj *createZiplistObject(void);
 812 robj *createSetObject(void);
 813 robj *createIntsetObject(void);
 814 robj *createHashObject(void);
 815 robj *createZsetObject(void);
 816 robj *createZsetZiplistObject(void);
 817 int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg);
 818 int checkType(redisClient *c, robj *o, int type);
 819 int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg);
 820 int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg);
 821 int getLongLongFromObject(robj *o, long long *target);
 822 int getLongDoubleFromObject(robj *o, long double *target);
 823 int getLongDoubleFromObjectOrReply(redisClient *c, robj *o, long double *target, const char *msg);
 824 char *strEncoding(int encoding);
 825 int compareStringObjects(robj *a, robj *b);
 826 int equalStringObjects(robj *a, robj *b);
 827 unsigned long estimateObjectIdleTime(robj *o);
 828
 829 /* Synchronous I/O with timeout */
 830 ssize_t syncWrite(int fd, char *ptr, ssize_t size, long long timeout);
 831 ssize_t syncRead(int fd, char *ptr, ssize_t size, long long timeout);
 832 ssize_t syncReadLine(int fd, char *ptr, ssize_t size, long long timeout);
 833
 834 /* Replication */
 835 void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
 836 void replicationFeedMonitors(redisClient *c, list *monitors, int dictid, robj **argv, int argc);
 837 void updateSlavesWaitingBgsave(int bgsaveerr);
 838 void replicationCron(void);
 839
 840 /* Generic persistence functions */
 841 void startLoading(FILE *fp);
 842 void loadingProgress(off_t pos);
 843 void stopLoading(void);
 844
 845 /* RDB persistence */
 846 #include "rdb.h"
 847
 848 /* AOF persistence */
 849 void flushAppendOnlyFile(int force);
 850 void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 851 void aofRemoveTempFile(pid_t childpid);
 852 int rewriteAppendOnlyFileBackground(void);
 853 int loadAppendOnlyFile(char *filename);
 854 void stopAppendOnly(void);
 855 int startAppendOnly(void);
 856 void backgroundRewriteDoneHandler(int exitcode, int bysignal);
 857 void aofRewriteBufferReset(void);
 858 unsigned long aofRewriteBufferSize(void);
 859
 860 /* Sorted sets data type */
 861
 862 /* Struct to hold a inclusive/exclusive range spec. */
 863 typedef struct {
 864     double min, max;
 865     int minex, maxex; /* are min or max exclusive? */
 866 } zrangespec;
 867
 868 zskiplist *zslCreate(void);
 869 void zslFree(zskiplist *zsl);
 870 zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
 871 unsigned char *zzlInsert(unsigned char *zl, robj *ele, double score);
 872 int zslDelete(zskiplist *zsl, double score, robj *obj);
 873 zskiplistNode *zslFirstInRange(zskiplist *zsl, zrangespec range);
 874 double zzlGetScore(unsigned char *sptr);
 875 void zzlNext(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
 876 void zzlPrev(unsigned char *zl, unsigned char **eptr, unsigned char **sptr);
 877 unsigned int zsetLength(robj *zobj);
 878 void zsetConvert(robj *zobj, int encoding);
 879
 880 /* Core functions */
 881 int freeMemoryIfNeeded(void);
 882 int processCommand(redisClient *c);
 883 void setupSignalHandlers(void);
 884 struct redisCommand *lookupCommand(sds name);
 885 struct redisCommand *lookupCommandByCString(char *s);
 886 void call(redisClient *c, int flags);
 887 void propagate(struct redisCommand *cmd, int dbid, robj **argv, int argc, int flags);
 888 void alsoPropagate(struct redisCommand *cmd, int dbid, robj **argv, int argc, int target);
 889 int prepareForShutdown();
 890 void redisLog(int level, const char *fmt, ...);
 891 void redisLogRaw(int level, const char *msg);
 892 void redisLogFromHandler(int level, const char *msg);
 893 void usage();
 894 void updateDictResizePolicy(void);
 895 int htNeedsResize(dict *dict);
 896 void oom(const char *msg);
 897 void populateCommandTable(void);
 898 void resetCommandTableStats(void);
 899
 900 /* Set data type */
 901 robj *setTypeCreate(robj *value);
 902 int setTypeAdd(robj *subject, robj *value);
 903 int setTypeRemove(robj *subject, robj *value);
 904 int setTypeIsMember(robj *subject, robj *value);
 905 setTypeIterator *setTypeInitIterator(robj *subject);
 906 void setTypeReleaseIterator(setTypeIterator *si);
 907 int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele);
 908 robj *setTypeNextObject(setTypeIterator *si);
 909 int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele);
 910 unsigned long setTypeSize(robj *subject);
 911 void setTypeConvert(robj *subject, int enc);
 912
 913 /* Hash data type */
 914 void hashTypeConvert(robj *o, int enc);
 915 void hashTypeTryConversion(robj *subject, robj **argv, int start, int end);
 916 void hashTypeTryObjectEncoding(robj *subject, robj **o1, robj **o2);
 917 robj *hashTypeGetObject(robj *o, robj *key);
 918 int hashTypeExists(robj *o, robj *key);
 919 int hashTypeSet(robj *o, robj *key, robj *value);
 920 int hashTypeDelete(robj *o, robj *key);
 921 unsigned long hashTypeLength(robj *o);
 922 hashTypeIterator *hashTypeInitIterator(robj *subject);
 923 void hashTypeReleaseIterator(hashTypeIterator *hi);
 924 int hashTypeNext(hashTypeIterator *hi);
 925 void hashTypeCurrentFromZiplist(hashTypeIterator *hi, int what,
 926                                 unsigned char **vstr,
 927                                 unsigned int *vlen,
 928                                 long long *vll);
 929 void hashTypeCurrentFromHashTable(hashTypeIterator *hi, int what, robj **dst);
 930 robj *hashTypeCurrentObject(hashTypeIterator *hi, int what);
 931 robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key);
 932
 933 /* Pub / Sub */
 934 int pubsubUnsubscribeAllChannels(redisClient *c, int notify);
 935 int pubsubUnsubscribeAllPatterns(redisClient *c, int notify);
 936 void freePubsubPattern(void *p);
 937 int listMatchPubsubPattern(void *a, void *b);
 938 int pubsubPublishMessage(robj *channel, robj *message);
 939
 940 /* Configuration */
 941 void loadServerConfig(char *filename, char *options);
 942 void appendServerSaveParams(time_t seconds, int changes);
 943 void resetServerSaveParams();
 944
 945 /* db.c -- Keyspace access API */
 946 int removeExpire(redisDb *db, robj *key);
 947 void propagateExpire(redisDb *db, robj *key);
 948 int expireIfNeeded(redisDb *db, robj *key);
 949 long long getExpire(redisDb *db, robj *key);
 950 void setExpire(redisDb *db, robj *key, long long when);
 951 robj *lookupKey(redisDb *db, robj *key);
 952 robj *lookupKeyRead(redisDb *db, robj *key);
 953 robj *lookupKeyWrite(redisDb *db, robj *key);
 954 robj *lookupKeyReadOrReply(redisClient *c, robj *key, robj *reply);
 955 robj *lookupKeyWriteOrReply(redisClient *c, robj *key, robj *reply);
 956 void dbAdd(redisDb *db, robj *key, robj *val);
 957 void dbOverwrite(redisDb *db, robj *key, robj *val);
 958 void setKey(redisDb *db, robj *key, robj *val);
 959 int dbExists(redisDb *db, robj *key);
 960 robj *dbRandomKey(redisDb *db);
 961 int dbDelete(redisDb *db, robj *key);
 962 long long emptyDb();
 963 int selectDb(redisClient *c, int id);
 964 void signalModifiedKey(redisDb *db, robj *key);
 965 void signalFlushedDb(int dbid);
 966 unsigned int GetKeysInSlot(unsigned int hashslot, robj **keys, unsigned int count);
 967
 968 /* API to get key arguments from commands */
 969 #define REDIS_GETKEYS_ALL 0
 970 #define REDIS_GETKEYS_PRELOAD 1
 971 int *getKeysFromCommand(struct redisCommand *cmd, robj **argv, int argc, int *numkeys, int flags);
 972 void getKeysFreeResult(int *result);
 973 int *noPreloadGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
 974 int *renameGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
 975 int *zunionInterGetKeys(struct redisCommand *cmd,robj **argv, int argc, int *numkeys, int flags);
 976
 977 /* Scripting */
 978 void scriptingInit(void);
 979
 980 /* Git SHA1 */
 981 char *redisGitSHA1(void);
 982 char *redisGitDirty(void);
 983
 984 /* Commands prototypes */
 985 void authCommand(redisClient *c);
 986 void pingCommand(redisClient *c);
 987 void echoCommand(redisClient *c);
 988 void setCommand(redisClient *c);
 989 void setnxCommand(redisClient *c);
 990 void setexCommand(redisClient *c);
 991 void psetexCommand(redisClient *c);
 992 void getCommand(redisClient *c);
 993 void delCommand(redisClient *c);
 994 void existsCommand(redisClient *c);
 995 void setbitCommand(redisClient *c);
 996 void getbitCommand(redisClient *c);
 997 void setrangeCommand(redisClient *c);
 998 void getrangeCommand(redisClient *c);
 999 void incrCommand(redisClient *c);
1000 void decrCommand(redisClient *c);
1001 void incrbyCommand(redisClient *c);
1002 void decrbyCommand(redisClient *c);
1003 void incrbyfloatCommand(redisClient *c);
1004 void selectCommand(redisClient *c);
1005 void randomkeyCommand(redisClient *c);
1006 void keysCommand(redisClient *c);
1007 void dbsizeCommand(redisClient *c);
1008 void lastsaveCommand(redisClient *c);
1009 void saveCommand(redisClient *c);
1010 void bgsaveCommand(redisClient *c);
1011 void bgrewriteaofCommand(redisClient *c);
1012 void shutdownCommand(redisClient *c);
1013 void moveCommand(redisClient *c);
1014 void renameCommand(redisClient *c);
1015 void renamenxCommand(redisClient *c);
1016 void lpushCommand(redisClient *c);
1017 void rpushCommand(redisClient *c);
1018 void lpushxCommand(redisClient *c);
1019 void rpushxCommand(redisClient *c);
1020 void linsertCommand(redisClient *c);
1021 void lpopCommand(redisClient *c);
1022 void rpopCommand(redisClient *c);
1023 void llenCommand(redisClient *c);
1024 void lindexCommand(redisClient *c);
1025 void lrangeCommand(redisClient *c);
1026 void ltrimCommand(redisClient *c);
1027 void typeCommand(redisClient *c);
1028 void lsetCommand(redisClient *c);
1029 void saddCommand(redisClient *c);
1030 void sremCommand(redisClient *c);
1031 void smoveCommand(redisClient *c);
1032 void sismemberCommand(redisClient *c);
1033 void scardCommand(redisClient *c);
1034 void spopCommand(redisClient *c);
1035 void srandmemberCommand(redisClient *c);
1036 void sinterCommand(redisClient *c);
1037 void sinterstoreCommand(redisClient *c);
1038 void sunionCommand(redisClient *c);
1039 void sunionstoreCommand(redisClient *c);
1040 void sdiffCommand(redisClient *c);
1041 void sdiffstoreCommand(redisClient *c);
1042 void syncCommand(redisClient *c);
1043 void flushdbCommand(redisClient *c);
1044 void flushallCommand(redisClient *c);
1045 void sortCommand(redisClient *c);
1046 void lremCommand(redisClient *c);
1047 void rpoplpushCommand(redisClient *c);
1048 void infoCommand(redisClient *c);
1049 void mgetCommand(redisClient *c);
1050 void monitorCommand(redisClient *c);
1051 void expireCommand(redisClient *c);
1052 void expireatCommand(redisClient *c);
1053 void pexpireCommand(redisClient *c);
1054 void pexpireatCommand(redisClient *c);
1055 void getsetCommand(redisClient *c);
1056 void ttlCommand(redisClient *c);
1057 void pttlCommand(redisClient *c);
1058 void persistCommand(redisClient *c);
1059 void slaveofCommand(redisClient *c);
1060 void debugCommand(redisClient *c);
1061 void msetCommand(redisClient *c);
1062 void msetnxCommand(redisClient *c);
1063 void zaddCommand(redisClient *c);
1064 void zincrbyCommand(redisClient *c);
1065 void zrangeCommand(redisClient *c);
1066 void zrangebyscoreCommand(redisClient *c);
1067 void zrevrangebyscoreCommand(redisClient *c);
1068 void zcountCommand(redisClient *c);
1069 void zrevrangeCommand(redisClient *c);
1070 void zcardCommand(redisClient *c);
1071 void zremCommand(redisClient *c);
1072 void zscoreCommand(redisClient *c);
1073 void zremrangebyscoreCommand(redisClient *c);
1074 void multiCommand(redisClient *c);
1075 void execCommand(redisClient *c);
1076 void discardCommand(redisClient *c);
1077 void blpopCommand(redisClient *c);
1078 void brpopCommand(redisClient *c);
1079 void brpoplpushCommand(redisClient *c);
1080 void appendCommand(redisClient *c);
1081 void strlenCommand(redisClient *c);
1082 void zrankCommand(redisClient *c);
1083 void zrevrankCommand(redisClient *c);
1084 void hsetCommand(redisClient *c);
1085 void hsetnxCommand(redisClient *c);
1086 void hgetCommand(redisClient *c);
1087 void hmsetCommand(redisClient *c);
1088 void hmgetCommand(redisClient *c);
1089 void hdelCommand(redisClient *c);
1090 void hlenCommand(redisClient *c);
1091 void zremrangebyrankCommand(redisClient *c);
1092 void zunionstoreCommand(redisClient *c);
1093 void zinterstoreCommand(redisClient *c);
1094 void hkeysCommand(redisClient *c);
1095 void hvalsCommand(redisClient *c);
1096 void hgetallCommand(redisClient *c);
1097 void hexistsCommand(redisClient *c);
1098 void configCommand(redisClient *c);
1099 void hincrbyCommand(redisClient *c);
1100 void hincrbyfloatCommand(redisClient *c);
1101 void subscribeCommand(redisClient *c);
1102 void unsubscribeCommand(redisClient *c);
1103 void psubscribeCommand(redisClient *c);
1104 void punsubscribeCommand(redisClient *c);
1105 void publishCommand(redisClient *c);
1106 void watchCommand(redisClient *c);
1107 void unwatchCommand(redisClient *c);
1108 void restoreCommand(redisClient *c);
1109 void migrateCommand(redisClient *c);
1110 void dumpCommand(redisClient *c);
1111 void objectCommand(redisClient *c);
1112 void clientCommand(redisClient *c);
1113 void evalCommand(redisClient *c);
1114 void evalShaCommand(redisClient *c);
1115 void scriptCommand(redisClient *c);
1116 void timeCommand(redisClient *c);
1117 void bitopCommand(redisClient *c);
1118 void bitcountCommand(redisClient *c);
1119 void replconfCommand(redisClient *c);
1120
1121 #if defined(__GNUC__)
1122 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
1123 void free(void *ptr) __attribute__ ((deprecated));
1124 void *malloc(size_t size) __attribute__ ((deprecated));
1125 void *realloc(void *ptr, size_t size) __attribute__ ((deprecated));
1126 #endif
1127
1128 /* Debugging stuff */
1129 void _redisAssertWithInfo(redisClient *c, robj *o, char *estr, char *file, int line);
1130 void _redisAssert(char *estr, char *file, int line);
1131 void _redisPanic(char *msg, char *file, int line);
1132 void bugReportStart(void);
1133 void redisLogObjectDebugInfo(robj *o);
1134 void sigsegvHandler(int sig, siginfo_t *info, void *secret);
1135 sds genRedisInfoString(char *section);
1136 void enableWatchdog(int period);
1137 void disableWatchdog(void);
1138 void watchdogScheduleSignal(int period);
1139 void redisLogHexDump(int level, char *descr, void *value, size_t len);
1140 #endif