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
  22 #include "ae.h"     /* Event driven programming library */
  23 #include "sds.h"    /* Dynamic safe strings */
  24 #include "dict.h"   /* Hash tables */
  25 #include "adlist.h" /* Linked lists */
  26 #include "zmalloc.h" /* total memory usage aware version of malloc/free */
  27 #include "anet.h"   /* Networking the easy way */
  28 #include "zipmap.h" /* Compact string -> string data structure */
  29 #include "ziplist.h" /* Compact list data structure */
  30 #include "intset.h" /* Compact integer set structure */
  31 #include "version.h"
  32
  33 /* Error codes */
  34 #define REDIS_OK                0
  35 #define REDIS_ERR               -1
  36
  37 /* Static server configuration */
  38 #define REDIS_SERVERPORT        6379    /* TCP port */
  39 #define REDIS_MAXIDLETIME       (60*5)  /* default client timeout */
  40 #define REDIS_IOBUF_LEN         1024
  41 #define REDIS_LOADBUF_LEN       1024
  42 #define REDIS_STATIC_ARGS       8
  43 #define REDIS_DEFAULT_DBNUM     16
  44 #define REDIS_CONFIGLINE_MAX    1024
  45 #define REDIS_MAX_SYNC_TIME     60      /* Slave can't take more to sync */
  46 #define REDIS_EXPIRELOOKUPS_PER_CRON    10 /* lookup 10 expires per loop */
  47 #define REDIS_MAX_WRITE_PER_EVENT (1024*64)
  48 #define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
  49 #define REDIS_SHARED_INTEGERS 10000
  50 #define REDIS_REPLY_CHUNK_BYTES (5*1500) /* 5 TCP packets with default MTU */
  51 #define REDIS_MAX_LOGMSG_LEN    1024 /* Default maximum length of syslog messages */
  52
  53 /* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
  54 #define REDIS_WRITEV_THRESHOLD      3
  55 /* Max number of iovecs used for each writev call */
  56 #define REDIS_WRITEV_IOVEC_COUNT    256
  57
  58 /* Hash table parameters */
  59 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
  60
  61 /* Command flags:
  62  *   REDIS_CMD_DENYOOM:
  63  *     Commands marked with this flag will return an error when 'maxmemory' is
  64  *     set and the server is using more than 'maxmemory' bytes of memory.
  65  *     In short: commands with this flag are denied on low memory conditions.
  66  *   REDIS_CMD_FORCE_REPLICATION:
  67  *     Force replication even if dirty is 0. */
  68 #define REDIS_CMD_DENYOOM 4
  69 #define REDIS_CMD_FORCE_REPLICATION 8
  70
  71 /* Object types */
  72 #define REDIS_STRING 0
  73 #define REDIS_LIST 1
  74 #define REDIS_SET 2
  75 #define REDIS_ZSET 3
  76 #define REDIS_HASH 4
  77 #define REDIS_VMPOINTER 8
  78
  79 /* Objects encoding. Some kind of objects like Strings and Hashes can be
  80  * internally represented in multiple ways. The 'encoding' field of the object
  81  * is set to one of this fields for this object. */
  82 #define REDIS_ENCODING_RAW 0     /* Raw representation */
  83 #define REDIS_ENCODING_INT 1     /* Encoded as integer */
  84 #define REDIS_ENCODING_HT 2      /* Encoded as hash table */
  85 #define REDIS_ENCODING_ZIPMAP 3  /* Encoded as zipmap */
  86 #define REDIS_ENCODING_LINKEDLIST 4 /* Encoded as regular linked list */
  87 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
  88 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
  89
  90 /* Object types only used for dumping to disk */
  91 #define REDIS_EXPIRETIME 253
  92 #define REDIS_SELECTDB 254
  93 #define REDIS_EOF 255
  94
  95 /* Defines related to the dump file format. To store 32 bits lengths for short
  96  * keys requires a lot of space, so we check the most significant 2 bits of
  97  * the first byte to interpreter the length:
  98  *
  99  * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
 100  * 01|000000 00000000 =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
 101  * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
 102  * 11|000000 this means: specially encoded object will follow. The six bits
 103  *           number specify the kind of object that follows.
 104  *           See the REDIS_RDB_ENC_* defines.
 105  *
 106  * Lenghts up to 63 are stored using a single byte, most DB keys, and may
 107  * values, will fit inside. */
 108 #define REDIS_RDB_6BITLEN 0
 109 #define REDIS_RDB_14BITLEN 1
 110 #define REDIS_RDB_32BITLEN 2
 111 #define REDIS_RDB_ENCVAL 3
 112 #define REDIS_RDB_LENERR UINT_MAX
 113
 114 /* When a length of a string object stored on disk has the first two bits
 115  * set, the remaining two bits specify a special encoding for the object
 116  * accordingly to the following defines: */
 117 #define REDIS_RDB_ENC_INT8 0        /* 8 bit signed integer */
 118 #define REDIS_RDB_ENC_INT16 1       /* 16 bit signed integer */
 119 #define REDIS_RDB_ENC_INT32 2       /* 32 bit signed integer */
 120 #define REDIS_RDB_ENC_LZF 3         /* string compressed with FASTLZ */
 121
 122 /* Scheduled IO opeations flags. */
 123 #define REDIS_IO_LOAD 1
 124 #define REDIS_IO_SAVE 2
 125 #define REDIS_IO_LOADINPROG 4
 126 #define REDIS_IO_SAVEINPROG 8
 127
 128 #define REDIS_MAX_COMPLETED_JOBS_PROCESSED 1
 129 #define REDIS_THREAD_STACK_SIZE (1024*1024*4)
 130
 131 /* Client flags */
 132 #define REDIS_SLAVE 1       /* This client is a slave server */
 133 #define REDIS_MASTER 2      /* This client is a master server */
 134 #define REDIS_MONITOR 4     /* This client is a slave monitor, see MONITOR */
 135 #define REDIS_MULTI 8       /* This client is in a MULTI context */
 136 #define REDIS_BLOCKED 16    /* The client is waiting in a blocking operation */
 137 #define REDIS_IO_WAIT 32    /* The client is waiting for Virtual Memory I/O */
 138 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 139 #define REDIS_CLOSE_AFTER_REPLY 128 /* Close after writing entire reply. */
 140
 141 /* Client request types */
 142 #define REDIS_REQ_INLINE 1
 143 #define REDIS_REQ_MULTIBULK 2
 144
 145 /* Slave replication state - slave side */
 146 #define REDIS_REPL_NONE 0   /* No active replication */
 147 #define REDIS_REPL_CONNECT 1    /* Must connect to master */
 148 #define REDIS_REPL_TRANSFER 2    /* Receiving .rdb from master */
 149 #define REDIS_REPL_CONNECTED 3  /* Connected to master */
 150
 151 /* Slave replication state - from the point of view of master
 152  * Note that in SEND_BULK and ONLINE state the slave receives new updates
 153  * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
 154  * to start the next background saving in order to send updates to it. */
 155 #define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
 156 #define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
 157 #define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
 158 #define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
 159
 160 /* List related stuff */
 161 #define REDIS_HEAD 0
 162 #define REDIS_TAIL 1
 163
 164 /* Sort operations */
 165 #define REDIS_SORT_GET 0
 166 #define REDIS_SORT_ASC 1
 167 #define REDIS_SORT_DESC 2
 168 #define REDIS_SORTKEY_MAX 1024
 169
 170 /* Log levels */
 171 #define REDIS_DEBUG 0
 172 #define REDIS_VERBOSE 1
 173 #define REDIS_NOTICE 2
 174 #define REDIS_WARNING 3
 175
 176 /* Anti-warning macro... */
 177 #define REDIS_NOTUSED(V) ((void) V)
 178
 179 #define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */
 180 #define ZSKIPLIST_P 0.25      /* Skiplist P = 1/4 */
 181
 182 /* Append only defines */
 183 #define APPENDFSYNC_NO 0
 184 #define APPENDFSYNC_ALWAYS 1
 185 #define APPENDFSYNC_EVERYSEC 2
 186
 187 /* Zip structure related defaults */
 188 #define REDIS_HASH_MAX_ZIPMAP_ENTRIES 64
 189 #define REDIS_HASH_MAX_ZIPMAP_VALUE 512
 190 #define REDIS_LIST_MAX_ZIPLIST_ENTRIES 512
 191 #define REDIS_LIST_MAX_ZIPLIST_VALUE 64
 192 #define REDIS_SET_MAX_INTSET_ENTRIES 512
 193
 194 /* Sets operations codes */
 195 #define REDIS_OP_UNION 0
 196 #define REDIS_OP_DIFF 1
 197 #define REDIS_OP_INTER 2
 198
 199 /* Redis maxmemory strategies */
 200 #define REDIS_MAXMEMORY_VOLATILE_LRU 0
 201 #define REDIS_MAXMEMORY_VOLATILE_TTL 1
 202 #define REDIS_MAXMEMORY_VOLATILE_RANDOM 2
 203 #define REDIS_MAXMEMORY_ALLKEYS_LRU 3
 204 #define REDIS_MAXMEMORY_ALLKEYS_RANDOM 4
 205 #define REDIS_MAXMEMORY_NO_EVICTION 5
 206
 207 /* We can print the stacktrace, so our assert is defined this way: */
 208 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
 209 #define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 210 void _redisAssert(char *estr, char *file, int line);
 211 void _redisPanic(char *msg, char *file, int line);
 212
 213 /*-----------------------------------------------------------------------------
 214  * Data types
 215  *----------------------------------------------------------------------------*/
 216
 217 /* A redis object, that is a type able to hold a string / list / set */
 218
 219 /* The actual Redis Object */
 220 #define REDIS_LRU_CLOCK_MAX ((1<<21)-1) /* Max value of obj->lru */
 221 #define REDIS_LRU_CLOCK_RESOLUTION 10 /* LRU clock resolution in seconds */
 222 typedef struct redisObject {
 223     unsigned type:4;
 224     unsigned notused:2;     /* Not used */
 225     unsigned encoding:4;
 226     unsigned lru:22;        /* lru time (relative to server.lruclock) */
 227     int refcount;
 228     void *ptr;
 229     /* VM fields are only allocated if VM is active, otherwise the
 230      * object allocation function will just allocate
 231      * sizeof(redisObjct) minus sizeof(redisObjectVM), so using
 232      * Redis without VM active will not have any overhead. */
 233 } robj;
 234
 235 /* The VM pointer structure - identifies an object in the swap file.
 236  *
 237  * This object is stored in place of the value
 238  * object in the main key->value hash table representing a database.
 239  * Note that the first fields (type, storage) are the same as the redisObject
 240  * structure so that vmPointer strucuters can be accessed even when casted
 241  * as redisObject structures.
 242  *
 243  * This is useful as we don't know if a value object is or not on disk, but we
 244  * are always able to read obj->storage to check this. For vmPointer
 245  * structures "type" is set to REDIS_VMPOINTER (even if without this field
 246  * is still possible to check the kind of object from the value of 'storage').*/
 247 typedef struct vmPointer {
 248     unsigned type:4;
 249     unsigned storage:2; /* REDIS_VM_SWAPPED or REDIS_VM_LOADING */
 250     unsigned notused:26;
 251     unsigned int vtype; /* type of the object stored in the swap file */
 252     off_t page;         /* the page at witch the object is stored on disk */
 253     off_t usedpages;    /* number of pages used on disk */
 254 } vmpointer;
 255
 256 /* Macro used to initalize a Redis object allocated on the stack.
 257  * Note that this macro is taken near the structure definition to make sure
 258  * we'll update it when the structure is changed, to avoid bugs like
 259  * bug #85 introduced exactly in this way. */
 260 #define initStaticStringObject(_var,_ptr) do { \
 261     _var.refcount = 1; \
 262     _var.type = REDIS_STRING; \
 263     _var.encoding = REDIS_ENCODING_RAW; \
 264     _var.ptr = _ptr; \
 265 } while(0);
 266
 267 typedef struct redisDb {
 268     dict *dict;                 /* The keyspace for this DB */
 269     dict *expires;              /* Timeout of keys with a timeout set */
 270     dict *blocking_keys;        /* Keys with clients waiting for data (BLPOP) */
 271     dict *io_keys;              /* Keys with clients waiting for DS I/O */
 272     dict *io_negcache;          /* Negative caching for disk store */
 273     dict *io_queued;            /* Queued IO operations hash table */
 274     dict *watched_keys;         /* WATCHED keys for MULTI/EXEC CAS */
 275     int id;
 276 } redisDb;
 277
 278 /* Client MULTI/EXEC state */
 279 typedef struct multiCmd {
 280     robj **argv;
 281     int argc;
 282     struct redisCommand *cmd;
 283 } multiCmd;
 284
 285 typedef struct multiState {
 286     multiCmd *commands;     /* Array of MULTI commands */
 287     int count;              /* Total number of MULTI commands */
 288 } multiState;
 289
 290 typedef struct blockingState {
 291     robj **keys;            /* The key we are waiting to terminate a blocking
 292                              * operation such as BLPOP. Otherwise NULL. */
 293     int count;              /* Number of blocking keys */
 294     time_t timeout;         /* Blocking operation timeout. If UNIX current time
 295                              * is >= timeout then the operation timed out. */
 296     robj *target;           /* The key that should receive the element,
 297                              * for BRPOPLPUSH. */
 298 } blockingState;
 299
 300 /* With multiplexing we need to take per-clinet state.
 301  * Clients are taken in a liked list. */
 302 typedef struct redisClient {
 303     int fd;
 304     redisDb *db;
 305     int dictid;
 306     sds querybuf;
 307     int argc;
 308     robj **argv;
 309     int reqtype;
 310     int multibulklen;       /* number of multi bulk arguments left to read */
 311     long bulklen;           /* length of bulk argument in multi bulk request */
 312     list *reply;
 313     int sentlen;
 314     time_t lastinteraction; /* time of the last interaction, used for timeout */
 315     int flags;              /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ... */
 316     int slaveseldb;         /* slave selected db, if this client is a slave */
 317     int authenticated;      /* when requirepass is non-NULL */
 318     int replstate;          /* replication state if this is a slave */
 319     int repldbfd;           /* replication DB file descriptor */
 320     long repldboff;         /* replication DB file offset */
 321     off_t repldbsize;       /* replication DB file size */
 322     multiState mstate;      /* MULTI/EXEC state */
 323     blockingState bpop;   /* blocking state */
 324     list *io_keys;          /* Keys this client is waiting to be loaded from the
 325                              * swap file in order to continue. */
 326     list *watched_keys;     /* Keys WATCHED for MULTI/EXEC CAS */
 327     dict *pubsub_channels;  /* channels a client is interested in (SUBSCRIBE) */
 328     list *pubsub_patterns;  /* patterns a client is interested in (SUBSCRIBE) */
 329
 330     /* Response buffer */
 331     int bufpos;
 332     char buf[REDIS_REPLY_CHUNK_BYTES];
 333 } redisClient;
 334
 335 struct saveparam {
 336     time_t seconds;
 337     int changes;
 338 };
 339
 340 struct sharedObjectsStruct {
 341     robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *cnegone, *pong, *space,
 342     *colon, *nullbulk, *nullmultibulk, *queued,
 343     *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
 344     *outofrangeerr, *loadingerr, *plus,
 345     *select0, *select1, *select2, *select3, *select4,
 346     *select5, *select6, *select7, *select8, *select9,
 347     *messagebulk, *pmessagebulk, *subscribebulk, *unsubscribebulk, *mbulk3,
 348     *mbulk4, *psubscribebulk, *punsubscribebulk,
 349     *integers[REDIS_SHARED_INTEGERS];
 350 };
 351
 352 /* Global server state structure */
 353 struct redisServer {
 354     pthread_t mainthread;
 355     int port;
 356     char *bindaddr;
 357     char *unixsocket;
 358     int ipfd;
 359     int sofd;
 360     redisDb *db;
 361     long long dirty;            /* changes to DB from the last save */
 362     long long dirty_before_bgsave; /* used to restore dirty on failed BGSAVE */
 363     list *clients;
 364     dict *commands;             /* Command table hahs table */
 365     /* RDB / AOF loading information */
 366     int loading;
 367     off_t loading_total_bytes;
 368     off_t loading_loaded_bytes;
 369     time_t loading_start_time;
 370     /* Fast pointers to often looked up command */
 371     struct redisCommand *delCommand, *multiCommand;
 372     list *slaves, *monitors;
 373     char neterr[ANET_ERR_LEN];
 374     aeEventLoop *el;
 375     int cronloops;              /* number of times the cron function run */
 376     time_t lastsave;                /* Unix time of last save succeeede */
 377     /* Fields used only for stats */
 378     time_t stat_starttime;          /* server start time */
 379     long long stat_numcommands;     /* number of processed commands */
 380     long long stat_numconnections;  /* number of connections received */
 381     long long stat_expiredkeys;     /* number of expired keys */
 382     long long stat_evictedkeys;     /* number of evicted keys (maxmemory) */
 383     long long stat_keyspace_hits;   /* number of successful lookups of keys */
 384     long long stat_keyspace_misses; /* number of failed lookups of keys */
 385     /* Configuration */
 386     int verbosity;
 387     int glueoutputbuf;
 388     int maxidletime;
 389     int dbnum;
 390     int daemonize;
 391     int appendonly;
 392     int appendfsync;
 393     int no_appendfsync_on_rewrite;
 394     int shutdown_asap;
 395     time_t lastfsync;
 396     int appendfd;
 397     int appendseldb;
 398     char *pidfile;
 399     pid_t bgsavechildpid;
 400     pid_t bgrewritechildpid;
 401     sds bgrewritebuf; /* buffer taken by parent during oppend only rewrite */
 402     sds aofbuf;       /* AOF buffer, written before entering the event loop */
 403     struct saveparam *saveparams;
 404     int saveparamslen;
 405     char *logfile;
 406     int syslog_enabled;
 407     char *syslog_ident;
 408     int syslog_facility;
 409     char *dbfilename;
 410     char *appendfilename;
 411     char *requirepass;
 412     int rdbcompression;
 413     int activerehashing;
 414     /* Replication related */
 415     int isslave;
 416     /* Slave specific fields */
 417     char *masterauth;
 418     char *masterhost;
 419     int masterport;
 420     redisClient *master;    /* client that is master for this slave */
 421     int replstate;          /* replication status if the instance is a slave */
 422     off_t repl_transfer_left;  /* bytes left reading .rdb  */
 423     int repl_transfer_s;    /* slave -> master SYNC socket */
 424     int repl_transfer_fd;   /* slave -> master SYNC temp file descriptor */
 425     char *repl_transfer_tmpfile; /* slave-> master SYNC temp file name */
 426     time_t repl_transfer_lastio; /* unix time of the latest read, for timeout */
 427     int repl_serve_stale_data; /* Serve stale data when link is down? */
 428     /* Limits */
 429     unsigned int maxclients;
 430     unsigned long long maxmemory;
 431     int maxmemory_policy;
 432     int maxmemory_samples;
 433     /* Blocked clients */
 434     unsigned int bpop_blocked_clients;
 435     unsigned int cache_blocked_clients;
 436     list *unblocked_clients; /* list of clients to unblock before next loop */
 437     list *cache_io_queue;    /* IO operations queue */
 438     int cache_flush_delay;   /* seconds to wait before flushing keys */
 439     /* Sort parameters - qsort_r() is only available under BSD so we
 440      * have to take this state global, in order to pass it to sortCompare() */
 441     int sort_desc;
 442     int sort_alpha;
 443     int sort_bypattern;
 444     /* Virtual memory configuration */
 445     int ds_enabled; /* backend disk in redis.conf */
 446     char *ds_path;  /* location of the disk store on disk */
 447     unsigned long long cache_max_memory;
 448     /* Zip structure config */
 449     size_t hash_max_zipmap_entries;
 450     size_t hash_max_zipmap_value;
 451     size_t list_max_ziplist_entries;
 452     size_t list_max_ziplist_value;
 453     size_t set_max_intset_entries;
 454     time_t unixtime;    /* Unix time sampled every second. */
 455     /* Virtual memory I/O threads stuff */
 456     /* An I/O thread process an element taken from the io_jobs queue and
 457      * put the result of the operation in the io_done list. While the
 458      * job is being processed, it's put on io_processing queue. */
 459     list *io_newjobs; /* List of VM I/O jobs yet to be processed */
 460     list *io_processing; /* List of VM I/O jobs being processed */
 461     list *io_processed; /* List of VM I/O jobs already processed */
 462     list *io_ready_clients; /* Clients ready to be unblocked. All keys loaded */
 463     pthread_mutex_t io_mutex; /* lock to access io_jobs/io_done/io_thread_job */
 464     pthread_cond_t io_condvar; /* I/O threads conditional variable */
 465     pthread_attr_t io_threads_attr; /* attributes for threads creation */
 466     int io_active_threads; /* Number of running I/O threads */
 467     int vm_max_threads; /* Max number of I/O threads running at the same time */
 468     /* Our main thread is blocked on the event loop, locking for sockets ready
 469      * to be read or written, so when a threaded I/O operation is ready to be
 470      * processed by the main thread, the I/O thread will use a unix pipe to
 471      * awake the main thread. The followings are the two pipe FDs. */
 472     int io_ready_pipe_read;
 473     int io_ready_pipe_write;
 474     /* Virtual memory stats */
 475     unsigned long long vm_stats_used_pages;
 476     unsigned long long vm_stats_swapped_objects;
 477     unsigned long long vm_stats_swapouts;
 478     unsigned long long vm_stats_swapins;
 479     /* Pubsub */
 480     dict *pubsub_channels; /* Map channels to list of subscribed clients */
 481     list *pubsub_patterns; /* A list of pubsub_patterns */
 482     /* Misc */
 483     unsigned lruclock:22;        /* clock incrementing every minute, for LRU */
 484     unsigned lruclock_padding:10;
 485 };
 486
 487 typedef struct pubsubPattern {
 488     redisClient *client;
 489     robj *pattern;
 490 } pubsubPattern;
 491
 492 typedef void redisCommandProc(redisClient *c);
 493 typedef void redisVmPreloadProc(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 494 struct redisCommand {
 495     char *name;
 496     redisCommandProc *proc;
 497     int arity;
 498     int flags;
 499     /* Use a function to determine which keys need to be loaded
 500      * in the background prior to executing this command. Takes precedence
 501      * over vm_firstkey and others, ignored when NULL */
 502     redisVmPreloadProc *vm_preload_proc;
 503     /* What keys should be loaded in background when calling this command? */
 504     int vm_firstkey; /* The first argument that's a key (0 = no keys) */
 505     int vm_lastkey;  /* THe last argument that's a key */
 506     int vm_keystep;  /* The step between first and last key */
 507 };
 508
 509 struct redisFunctionSym {
 510     char *name;
 511     unsigned long pointer;
 512 };
 513
 514 typedef struct _redisSortObject {
 515     robj *obj;
 516     union {
 517         double score;
 518         robj *cmpobj;
 519     } u;
 520 } redisSortObject;
 521
 522 typedef struct _redisSortOperation {
 523     int type;
 524     robj *pattern;
 525 } redisSortOperation;
 526
 527 /* ZSETs use a specialized version of Skiplists */
 528 typedef struct zskiplistNode {
 529     robj *obj;
 530     double score;
 531     struct zskiplistNode *backward;
 532     struct zskiplistLevel {
 533         struct zskiplistNode *forward;
 534         unsigned int span;
 535     } level[];
 536 } zskiplistNode;
 537
 538 typedef struct zskiplist {
 539     struct zskiplistNode *header, *tail;
 540     unsigned long length;
 541     int level;
 542 } zskiplist;
 543
 544 typedef struct zset {
 545     dict *dict;
 546     zskiplist *zsl;
 547 } zset;
 548
 549 /* DIsk store threaded I/O request message */
 550 #define REDIS_IOJOB_LOAD 0
 551 #define REDIS_IOJOB_SAVE 1
 552
 553 typedef struct iojob {
 554     int type;   /* Request type, REDIS_IOJOB_* */
 555     redisDb *db;/* Redis database */
 556     robj *key;  /* This I/O request is about this key */
 557     robj *val;  /* the value to swap for REDIS_IOJOB_SAVE, otherwise this
 558                  * field is populated by the I/O thread for REDIS_IOJOB_LOAD. */
 559     time_t expire; /* Expire time for this key on REDIS_IOJOB_LOAD */
 560 } iojob;
 561
 562 /* IO operations scheduled -- check dscache.c for more info */
 563 typedef struct ioop {
 564     int type;
 565     redisDb *db;
 566     robj *key;
 567     time_t ctime; /* This is the creation time of the entry. */
 568 } ioop;
 569
 570 /* Structure to hold list iteration abstraction. */
 571 typedef struct {
 572     robj *subject;
 573     unsigned char encoding;
 574     unsigned char direction; /* Iteration direction */
 575     unsigned char *zi;
 576     listNode *ln;
 577 } listTypeIterator;
 578
 579 /* Structure for an entry while iterating over a list. */
 580 typedef struct {
 581     listTypeIterator *li;
 582     unsigned char *zi;  /* Entry in ziplist */
 583     listNode *ln;       /* Entry in linked list */
 584 } listTypeEntry;
 585
 586 /* Structure to hold set iteration abstraction. */
 587 typedef struct {
 588     robj *subject;
 589     int encoding;
 590     int ii; /* intset iterator */
 591     dictIterator *di;
 592 } setTypeIterator;
 593
 594 /* Structure to hold hash iteration abstration. Note that iteration over
 595  * hashes involves both fields and values. Because it is possible that
 596  * not both are required, store pointers in the iterator to avoid
 597  * unnecessary memory allocation for fields/values. */
 598 typedef struct {
 599     int encoding;
 600     unsigned char *zi;
 601     unsigned char *zk, *zv;
 602     unsigned int zklen, zvlen;
 603
 604     dictIterator *di;
 605     dictEntry *de;
 606 } hashTypeIterator;
 607
 608 #define REDIS_HASH_KEY 1
 609 #define REDIS_HASH_VALUE 2
 610
 611 /*-----------------------------------------------------------------------------
 612  * Extern declarations
 613  *----------------------------------------------------------------------------*/
 614
 615 extern struct redisServer server;
 616 extern struct sharedObjectsStruct shared;
 617 extern dictType setDictType;
 618 extern dictType zsetDictType;
 619 extern double R_Zero, R_PosInf, R_NegInf, R_Nan;
 620 dictType hashDictType;
 621
 622 /*-----------------------------------------------------------------------------
 623  * Functions prototypes
 624  *----------------------------------------------------------------------------*/
 625
 626 /* networking.c -- Networking and Client related operations */
 627 redisClient *createClient(int fd);
 628 void closeTimedoutClients(void);
 629 void freeClient(redisClient *c);
 630 void resetClient(redisClient *c);
 631 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
 632 void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
 633 void addReply(redisClient *c, robj *obj);
 634 void *addDeferredMultiBulkLength(redisClient *c);
 635 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);
 636 void addReplySds(redisClient *c, sds s);
 637 void processInputBuffer(redisClient *c);
 638 void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 639 void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 640 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
 641 void addReplyBulk(redisClient *c, robj *obj);
 642 void addReplyBulkCString(redisClient *c, char *s);
 643 void addReplyBulkCBuffer(redisClient *c, void *p, size_t len);
 644 void addReplyBulkLongLong(redisClient *c, long long ll);
 645 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 646 void addReply(redisClient *c, robj *obj);
 647 void addReplySds(redisClient *c, sds s);
 648 void addReplyError(redisClient *c, char *err);
 649 void addReplyStatus(redisClient *c, char *status);
 650 void addReplyDouble(redisClient *c, double d);
 651 void addReplyLongLong(redisClient *c, long long ll);
 652 void addReplyMultiBulkLen(redisClient *c, long length);
 653 void *dupClientReplyValue(void *o);
 654
 655 #ifdef __GNUC__
 656 void addReplyErrorFormat(redisClient *c, const char *fmt, ...)
 657     __attribute__((format(printf, 2, 3)));
 658 void addReplyStatusFormat(redisClient *c, const char *fmt, ...)
 659     __attribute__((format(printf, 2, 3)));
 660 #else
 661 void addReplyErrorFormat(redisClient *c, const char *fmt, ...);
 662 void addReplyStatusFormat(redisClient *c, const char *fmt, ...);
 663 #endif
 664
 665 /* List data type */
 666 void listTypeTryConversion(robj *subject, robj *value);
 667 void listTypePush(robj *subject, robj *value, int where);
 668 robj *listTypePop(robj *subject, int where);
 669 unsigned long listTypeLength(robj *subject);
 670 listTypeIterator *listTypeInitIterator(robj *subject, int index, unsigned char direction);
 671 void listTypeReleaseIterator(listTypeIterator *li);
 672 int listTypeNext(listTypeIterator *li, listTypeEntry *entry);
 673 robj *listTypeGet(listTypeEntry *entry);
 674 void listTypeInsert(listTypeEntry *entry, robj *value, int where);
 675 int listTypeEqual(listTypeEntry *entry, robj *o);
 676 void listTypeDelete(listTypeEntry *entry);
 677 void listTypeConvert(robj *subject, int enc);
 678 void unblockClientWaitingData(redisClient *c);
 679 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
 680 void popGenericCommand(redisClient *c, int where);
 681
 682 /* MULTI/EXEC/WATCH... */
 683 void unwatchAllKeys(redisClient *c);
 684 void initClientMultiState(redisClient *c);
 685 void freeClientMultiState(redisClient *c);
 686 void queueMultiCommand(redisClient *c, struct redisCommand *cmd);
 687 void touchWatchedKey(redisDb *db, robj *key);
 688 void touchWatchedKeysOnFlush(int dbid);
 689
 690 /* Redis object implementation */
 691 void decrRefCount(void *o);
 692 void incrRefCount(robj *o);
 693 void freeStringObject(robj *o);
 694 void freeListObject(robj *o);
 695 void freeSetObject(robj *o);
 696 void freeZsetObject(robj *o);
 697 void freeHashObject(robj *o);
 698 robj *createObject(int type, void *ptr);
 699 robj *createStringObject(char *ptr, size_t len);
 700 robj *dupStringObject(robj *o);
 701 robj *tryObjectEncoding(robj *o);
 702 robj *getDecodedObject(robj *o);
 703 size_t stringObjectLen(robj *o);
 704 robj *createStringObjectFromLongLong(long long value);
 705 robj *createListObject(void);
 706 robj *createZiplistObject(void);
 707 robj *createSetObject(void);
 708 robj *createIntsetObject(void);
 709 robj *createHashObject(void);
 710 robj *createZsetObject(void);
 711 int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg);
 712 int checkType(redisClient *c, robj *o, int type);
 713 int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg);
 714 int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg);
 715 int getLongLongFromObject(robj *o, long long *target);
 716 char *strEncoding(int encoding);
 717 int compareStringObjects(robj *a, robj *b);
 718 int equalStringObjects(robj *a, robj *b);
 719 unsigned long estimateObjectIdleTime(robj *o);
 720
 721 /* Synchronous I/O with timeout */
 722 int syncWrite(int fd, char *ptr, ssize_t size, int timeout);
 723 int syncRead(int fd, char *ptr, ssize_t size, int timeout);
 724 int syncReadLine(int fd, char *ptr, ssize_t size, int timeout);
 725 int fwriteBulkString(FILE *fp, char *s, unsigned long len);
 726 int fwriteBulkDouble(FILE *fp, double d);
 727 int fwriteBulkLongLong(FILE *fp, long long l);
 728 int fwriteBulkObject(FILE *fp, robj *obj);
 729
 730 /* Replication */
 731 void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
 732 void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc);
 733 int syncWithMaster(void);
 734 void updateSlavesWaitingBgsave(int bgsaveerr);
 735 void replicationCron(void);
 736
 737 /* Generic persistence functions */
 738 void startLoading(FILE *fp);
 739 void loadingProgress(off_t pos);
 740 void stopLoading(void);
 741
 742 /* RDB persistence */
 743 int rdbLoad(char *filename);
 744 int rdbSaveBackground(char *filename);
 745 void rdbRemoveTempFile(pid_t childpid);
 746 int rdbSave(char *filename);
 747 int rdbSaveObject(FILE *fp, robj *o);
 748 off_t rdbSavedObjectLen(robj *o);
 749 off_t rdbSavedObjectPages(robj *o);
 750 robj *rdbLoadObject(int type, FILE *fp);
 751 void backgroundSaveDoneHandler(int statloc);
 752 int rdbSaveKeyValuePair(FILE *fp, redisDb *db, robj *key, robj *val, time_t now);
 753 int rdbLoadType(FILE *fp);
 754 time_t rdbLoadTime(FILE *fp);
 755 robj *rdbLoadStringObject(FILE *fp);
 756
 757 /* AOF persistence */
 758 void flushAppendOnlyFile(void);
 759 void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 760 void aofRemoveTempFile(pid_t childpid);
 761 int rewriteAppendOnlyFileBackground(void);
 762 int loadAppendOnlyFile(char *filename);
 763 void stopAppendOnly(void);
 764 int startAppendOnly(void);
 765 void backgroundRewriteDoneHandler(int statloc);
 766
 767 /* Sorted sets data type */
 768 zskiplist *zslCreate(void);
 769 void zslFree(zskiplist *zsl);
 770 zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj);
 771
 772 /* Core functions */
 773 void freeMemoryIfNeeded(void);
 774 int processCommand(redisClient *c);
 775 void setupSigSegvAction(void);
 776 struct redisCommand *lookupCommand(sds name);
 777 struct redisCommand *lookupCommandByCString(char *s);
 778 void call(redisClient *c, struct redisCommand *cmd);
 779 int prepareForShutdown();
 780 void redisLog(int level, const char *fmt, ...);
 781 void usage();
 782 void updateDictResizePolicy(void);
 783 int htNeedsResize(dict *dict);
 784 void oom(const char *msg);
 785 void populateCommandTable(void);
 786
 787 /* Disk store */
 788 int dsOpen(void);
 789 int dsClose(void);
 790 int dsSet(redisDb *db, robj *key, robj *val);
 791 robj *dsGet(redisDb *db, robj *key, time_t *expire);
 792 int dsDel(redisDb *db, robj *key);
 793 int dsExists(redisDb *db, robj *key);
 794 void dsFlushDb(int dbid);
 795
 796 /* Disk Store Cache */
 797 void dsInit(void);
 798 void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata, int mask);
 799 void lockThreadedIO(void);
 800 void unlockThreadedIO(void);
 801 void freeIOJob(iojob *j);
 802 void queueIOJob(iojob *j);
 803 void waitEmptyIOJobsQueue(void);
 804 void processAllPendingIOJobs(void);
 805 void zunionInterBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 806 void execBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 807 int blockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd);
 808 int dontWaitForSwappedKey(redisClient *c, robj *key);
 809 void handleClientsBlockedOnSwappedKey(redisDb *db, robj *key);
 810 int cacheFreeOneEntry(void);
 811 void cacheScheduleIOAddFlag(redisDb *db, robj *key, long flag);
 812 void cacheScheduleIODelFlag(redisDb *db, robj *key, long flag);
 813 int cacheScheduleIOGetFlags(redisDb *db, robj *key);
 814 void cacheScheduleIO(redisDb *db, robj *key, int type);
 815 void cacheCron(void);
 816 int cacheKeyMayExist(redisDb *db, robj *key);
 817 void cacheSetKeyMayExist(redisDb *db, robj *key);
 818 void cacheSetKeyDoesNotExist(redisDb *db, robj *key);
 819
 820 /* Set data type */
 821 robj *setTypeCreate(robj *value);
 822 int setTypeAdd(robj *subject, robj *value);
 823 int setTypeRemove(robj *subject, robj *value);
 824 int setTypeIsMember(robj *subject, robj *value);
 825 setTypeIterator *setTypeInitIterator(robj *subject);
 826 void setTypeReleaseIterator(setTypeIterator *si);
 827 int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele);
 828 robj *setTypeNextObject(setTypeIterator *si);
 829 int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele);
 830 unsigned long setTypeSize(robj *subject);
 831 void setTypeConvert(robj *subject, int enc);
 832
 833 /* Hash data type */
 834 void convertToRealHash(robj *o);
 835 void hashTypeTryConversion(robj *subject, robj **argv, int start, int end);
 836 void hashTypeTryObjectEncoding(robj *subject, robj **o1, robj **o2);
 837 int hashTypeGet(robj *o, robj *key, robj **objval, unsigned char **v, unsigned int *vlen);
 838 robj *hashTypeGetObject(robj *o, robj *key);
 839 int hashTypeExists(robj *o, robj *key);
 840 int hashTypeSet(robj *o, robj *key, robj *value);
 841 int hashTypeDelete(robj *o, robj *key);
 842 unsigned long hashTypeLength(robj *o);
 843 hashTypeIterator *hashTypeInitIterator(robj *subject);
 844 void hashTypeReleaseIterator(hashTypeIterator *hi);
 845 int hashTypeNext(hashTypeIterator *hi);
 846 int hashTypeCurrent(hashTypeIterator *hi, int what, robj **objval, unsigned char **v, unsigned int *vlen);
 847 robj *hashTypeCurrentObject(hashTypeIterator *hi, int what);
 848 robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key);
 849
 850 /* Pub / Sub */
 851 int pubsubUnsubscribeAllChannels(redisClient *c, int notify);
 852 int pubsubUnsubscribeAllPatterns(redisClient *c, int notify);
 853 void freePubsubPattern(void *p);
 854 int listMatchPubsubPattern(void *a, void *b);
 855
 856 /* Utility functions */
 857 int stringmatchlen(const char *pattern, int patternLen,
 858         const char *string, int stringLen, int nocase);
 859 int stringmatch(const char *pattern, const char *string, int nocase);
 860 long long memtoll(const char *p, int *err);
 861 int ll2string(char *s, size_t len, long long value);
 862 int isStringRepresentableAsLong(sds s, long *longval);
 863 int isStringRepresentableAsLongLong(sds s, long long *longval);
 864 int isObjectRepresentableAsLongLong(robj *o, long long *llongval);
 865
 866 /* Configuration */
 867 void loadServerConfig(char *filename);
 868 void appendServerSaveParams(time_t seconds, int changes);
 869 void resetServerSaveParams();
 870
 871 /* db.c -- Keyspace access API */
 872 int removeExpire(redisDb *db, robj *key);
 873 void propagateExpire(redisDb *db, robj *key);
 874 int expireIfNeeded(redisDb *db, robj *key);
 875 time_t getExpire(redisDb *db, robj *key);
 876 void setExpire(redisDb *db, robj *key, time_t when);
 877 robj *lookupKey(redisDb *db, robj *key);
 878 robj *lookupKeyRead(redisDb *db, robj *key);
 879 robj *lookupKeyWrite(redisDb *db, robj *key);
 880 robj *lookupKeyReadOrReply(redisClient *c, robj *key, robj *reply);
 881 robj *lookupKeyWriteOrReply(redisClient *c, robj *key, robj *reply);
 882 int dbAdd(redisDb *db, robj *key, robj *val);
 883 int dbReplace(redisDb *db, robj *key, robj *val);
 884 int dbExists(redisDb *db, robj *key);
 885 robj *dbRandomKey(redisDb *db);
 886 int dbDelete(redisDb *db, robj *key);
 887 long long emptyDb();
 888 int selectDb(redisClient *c, int id);
 889 void signalModifiedKey(redisDb *db, robj *key);
 890 void signalFlushedDb(int dbid);
 891
 892 /* Git SHA1 */
 893 char *redisGitSHA1(void);
 894 char *redisGitDirty(void);
 895
 896 /* Commands prototypes */
 897 void authCommand(redisClient *c);
 898 void pingCommand(redisClient *c);
 899 void echoCommand(redisClient *c);
 900 void setCommand(redisClient *c);
 901 void setnxCommand(redisClient *c);
 902 void setexCommand(redisClient *c);
 903 void getCommand(redisClient *c);
 904 void delCommand(redisClient *c);
 905 void existsCommand(redisClient *c);
 906 void setbitCommand(redisClient *c);
 907 void getbitCommand(redisClient *c);
 908 void setrangeCommand(redisClient *c);
 909 void getrangeCommand(redisClient *c);
 910 void incrCommand(redisClient *c);
 911 void decrCommand(redisClient *c);
 912 void incrbyCommand(redisClient *c);
 913 void decrbyCommand(redisClient *c);
 914 void selectCommand(redisClient *c);
 915 void randomkeyCommand(redisClient *c);
 916 void keysCommand(redisClient *c);
 917 void dbsizeCommand(redisClient *c);
 918 void lastsaveCommand(redisClient *c);
 919 void saveCommand(redisClient *c);
 920 void bgsaveCommand(redisClient *c);
 921 void bgrewriteaofCommand(redisClient *c);
 922 void shutdownCommand(redisClient *c);
 923 void moveCommand(redisClient *c);
 924 void renameCommand(redisClient *c);
 925 void renamenxCommand(redisClient *c);
 926 void lpushCommand(redisClient *c);
 927 void rpushCommand(redisClient *c);
 928 void lpushxCommand(redisClient *c);
 929 void rpushxCommand(redisClient *c);
 930 void linsertCommand(redisClient *c);
 931 void lpopCommand(redisClient *c);
 932 void rpopCommand(redisClient *c);
 933 void llenCommand(redisClient *c);
 934 void lindexCommand(redisClient *c);
 935 void lrangeCommand(redisClient *c);
 936 void ltrimCommand(redisClient *c);
 937 void typeCommand(redisClient *c);
 938 void lsetCommand(redisClient *c);
 939 void saddCommand(redisClient *c);
 940 void sremCommand(redisClient *c);
 941 void smoveCommand(redisClient *c);
 942 void sismemberCommand(redisClient *c);
 943 void scardCommand(redisClient *c);
 944 void spopCommand(redisClient *c);
 945 void srandmemberCommand(redisClient *c);
 946 void sinterCommand(redisClient *c);
 947 void sinterstoreCommand(redisClient *c);
 948 void sunionCommand(redisClient *c);
 949 void sunionstoreCommand(redisClient *c);
 950 void sdiffCommand(redisClient *c);
 951 void sdiffstoreCommand(redisClient *c);
 952 void syncCommand(redisClient *c);
 953 void flushdbCommand(redisClient *c);
 954 void flushallCommand(redisClient *c);
 955 void sortCommand(redisClient *c);
 956 void lremCommand(redisClient *c);
 957 void rpoplpushCommand(redisClient *c);
 958 void infoCommand(redisClient *c);
 959 void mgetCommand(redisClient *c);
 960 void monitorCommand(redisClient *c);
 961 void expireCommand(redisClient *c);
 962 void expireatCommand(redisClient *c);
 963 void getsetCommand(redisClient *c);
 964 void ttlCommand(redisClient *c);
 965 void persistCommand(redisClient *c);
 966 void slaveofCommand(redisClient *c);
 967 void debugCommand(redisClient *c);
 968 void msetCommand(redisClient *c);
 969 void msetnxCommand(redisClient *c);
 970 void zaddCommand(redisClient *c);
 971 void zincrbyCommand(redisClient *c);
 972 void zrangeCommand(redisClient *c);
 973 void zrangebyscoreCommand(redisClient *c);
 974 void zrevrangebyscoreCommand(redisClient *c);
 975 void zcountCommand(redisClient *c);
 976 void zrevrangeCommand(redisClient *c);
 977 void zcardCommand(redisClient *c);
 978 void zremCommand(redisClient *c);
 979 void zscoreCommand(redisClient *c);
 980 void zremrangebyscoreCommand(redisClient *c);
 981 void multiCommand(redisClient *c);
 982 void execCommand(redisClient *c);
 983 void discardCommand(redisClient *c);
 984 void blpopCommand(redisClient *c);
 985 void brpopCommand(redisClient *c);
 986 void brpoplpushCommand(redisClient *c);
 987 void appendCommand(redisClient *c);
 988 void strlenCommand(redisClient *c);
 989 void zrankCommand(redisClient *c);
 990 void zrevrankCommand(redisClient *c);
 991 void hsetCommand(redisClient *c);
 992 void hsetnxCommand(redisClient *c);
 993 void hgetCommand(redisClient *c);
 994 void hmsetCommand(redisClient *c);
 995 void hmgetCommand(redisClient *c);
 996 void hdelCommand(redisClient *c);
 997 void hlenCommand(redisClient *c);
 998 void zremrangebyrankCommand(redisClient *c);
 999 void zunionstoreCommand(redisClient *c);
1000 void zinterstoreCommand(redisClient *c);
1001 void hkeysCommand(redisClient *c);
1002 void hvalsCommand(redisClient *c);
1003 void hgetallCommand(redisClient *c);
1004 void hexistsCommand(redisClient *c);
1005 void configCommand(redisClient *c);
1006 void hincrbyCommand(redisClient *c);
1007 void subscribeCommand(redisClient *c);
1008 void unsubscribeCommand(redisClient *c);
1009 void psubscribeCommand(redisClient *c);
1010 void punsubscribeCommand(redisClient *c);
1011 void publishCommand(redisClient *c);
1012 void watchCommand(redisClient *c);
1013 void unwatchCommand(redisClient *c);
1014
1015 #if defined(__GNUC__)
1016 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
1017 void free(void *ptr) __attribute__ ((deprecated));
1018 void *malloc(size_t size) __attribute__ ((deprecated));
1019 void *realloc(void *ptr, size_t size) __attribute__ ((deprecated));
1020 #endif
1021
1022 #endif