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
  21 #include "ae.h"     /* Event driven programming library */
  22 #include "sds.h"    /* Dynamic safe strings */
  23 #include "dict.h"   /* Hash tables */
  24 #include "adlist.h" /* Linked lists */
  25 #include "zmalloc.h" /* total memory usage aware version of malloc/free */
  26 #include "anet.h"   /* Networking the easy way */
  27 #include "zipmap.h" /* Compact string -> string data structure */
  28 #include "ziplist.h" /* Compact list data structure */
  29 #include "intset.h" /* Compact integer set structure */
  30 #include "version.h"
  31
  32 /* Error codes */
  33 #define REDIS_OK                0
  34 #define REDIS_ERR               -1
  35
  36 /* Static server configuration */
  37 #define REDIS_SERVERPORT        6379    /* TCP port */
  38 #define REDIS_MAXIDLETIME       (60*5)  /* default client timeout */
  39 #define REDIS_IOBUF_LEN         1024
  40 #define REDIS_LOADBUF_LEN       1024
  41 #define REDIS_STATIC_ARGS       8
  42 #define REDIS_DEFAULT_DBNUM     16
  43 #define REDIS_CONFIGLINE_MAX    1024
  44 #define REDIS_OBJFREELIST_MAX   1000000 /* Max number of objects to cache */
  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
  52 /* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
  53 #define REDIS_WRITEV_THRESHOLD      3
  54 /* Max number of iovecs used for each writev call */
  55 #define REDIS_WRITEV_IOVEC_COUNT    256
  56
  57 /* Hash table parameters */
  58 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
  59
  60 /* Command flags */
  61 #define REDIS_CMD_BULK          1       /* Bulk write command */
  62 #define REDIS_CMD_INLINE        2       /* Inline command */
  63 /* REDIS_CMD_DENYOOM reserves a longer comment: all the commands marked with
  64    this flags will return an error when the 'maxmemory' option is set in the
  65    config file and the server is using more than maxmemory bytes of memory.
  66    In short this commands are denied on low memory conditions. */
  67 #define REDIS_CMD_DENYOOM       4
  68 #define REDIS_CMD_FORCE_REPLICATION 8 /* Force replication even if dirty is 0 */
  69
  70 /* Object types */
  71 #define REDIS_STRING 0
  72 #define REDIS_LIST 1
  73 #define REDIS_SET 2
  74 #define REDIS_ZSET 3
  75 #define REDIS_HASH 4
  76 #define REDIS_VMPOINTER 8
  77
  78 /* Objects encoding. Some kind of objects like Strings and Hashes can be
  79  * internally represented in multiple ways. The 'encoding' field of the object
  80  * is set to one of this fields for this object. */
  81 #define REDIS_ENCODING_RAW 0     /* Raw representation */
  82 #define REDIS_ENCODING_INT 1     /* Encoded as integer */
  83 #define REDIS_ENCODING_HT 2      /* Encoded as hash table */
  84 #define REDIS_ENCODING_ZIPMAP 3  /* Encoded as zipmap */
  85 #define REDIS_ENCODING_LINKEDLIST 4 /* Encoded as regular linked list */
  86 #define REDIS_ENCODING_ZIPLIST 5 /* Encoded as ziplist */
  87 #define REDIS_ENCODING_INTSET 6  /* Encoded as intset */
  88
  89 /* Object types only used for dumping to disk */
  90 #define REDIS_EXPIRETIME 253
  91 #define REDIS_SELECTDB 254
  92 #define REDIS_EOF 255
  93
  94 /* Defines related to the dump file format. To store 32 bits lengths for short
  95  * keys requires a lot of space, so we check the most significant 2 bits of
  96  * the first byte to interpreter the length:
  97  *
  98  * 00|000000 => if the two MSB are 00 the len is the 6 bits of this byte
  99  * 01|000000 00000000 =>  01, the len is 14 byes, 6 bits + 8 bits of next byte
 100  * 10|000000 [32 bit integer] => if it's 01, a full 32 bit len will follow
 101  * 11|000000 this means: specially encoded object will follow. The six bits
 102  *           number specify the kind of object that follows.
 103  *           See the REDIS_RDB_ENC_* defines.
 104  *
 105  * Lenghts up to 63 are stored using a single byte, most DB keys, and may
 106  * values, will fit inside. */
 107 #define REDIS_RDB_6BITLEN 0
 108 #define REDIS_RDB_14BITLEN 1
 109 #define REDIS_RDB_32BITLEN 2
 110 #define REDIS_RDB_ENCVAL 3
 111 #define REDIS_RDB_LENERR UINT_MAX
 112
 113 /* When a length of a string object stored on disk has the first two bits
 114  * set, the remaining two bits specify a special encoding for the object
 115  * accordingly to the following defines: */
 116 #define REDIS_RDB_ENC_INT8 0        /* 8 bit signed integer */
 117 #define REDIS_RDB_ENC_INT16 1       /* 16 bit signed integer */
 118 #define REDIS_RDB_ENC_INT32 2       /* 32 bit signed integer */
 119 #define REDIS_RDB_ENC_LZF 3         /* string compressed with FASTLZ */
 120
 121 /* Virtual memory object->where field. */
 122 #define REDIS_VM_MEMORY 0       /* The object is on memory */
 123 #define REDIS_VM_SWAPPED 1      /* The object is on disk */
 124 #define REDIS_VM_SWAPPING 2     /* Redis is swapping this object on disk */
 125 #define REDIS_VM_LOADING 3      /* Redis is loading this object from disk */
 126
 127 /* Virtual memory static configuration stuff.
 128  * Check vmFindContiguousPages() to know more about this magic numbers. */
 129 #define REDIS_VM_MAX_NEAR_PAGES 65536
 130 #define REDIS_VM_MAX_RANDOM_JUMP 4096
 131 #define REDIS_VM_MAX_THREADS 32
 132 #define REDIS_THREAD_STACK_SIZE (1024*1024*4)
 133 /* The following is the *percentage* of completed I/O jobs to process when the
 134  * handelr is called. While Virtual Memory I/O operations are performed by
 135  * threads, this operations must be processed by the main thread when completed
 136  * in order to take effect. */
 137 #define REDIS_MAX_COMPLETED_JOBS_PROCESSED 1
 138
 139 /* Client flags */
 140 #define REDIS_SLAVE 1       /* This client is a slave server */
 141 #define REDIS_MASTER 2      /* This client is a master server */
 142 #define REDIS_MONITOR 4     /* This client is a slave monitor, see MONITOR */
 143 #define REDIS_MULTI 8       /* This client is in a MULTI context */
 144 #define REDIS_BLOCKED 16    /* The client is waiting in a blocking operation */
 145 #define REDIS_IO_WAIT 32    /* The client is waiting for Virtual Memory I/O */
 146 #define REDIS_DIRTY_CAS 64  /* Watched keys modified. EXEC will fail. */
 147
 148 /* Slave replication state - slave side */
 149 #define REDIS_REPL_NONE 0   /* No active replication */
 150 #define REDIS_REPL_CONNECT 1    /* Must connect to master */
 151 #define REDIS_REPL_CONNECTED 2  /* Connected to master */
 152
 153 /* Slave replication state - from the point of view of master
 154  * Note that in SEND_BULK and ONLINE state the slave receives new updates
 155  * in its output queue. In the WAIT_BGSAVE state instead the server is waiting
 156  * to start the next background saving in order to send updates to it. */
 157 #define REDIS_REPL_WAIT_BGSAVE_START 3 /* master waits bgsave to start feeding it */
 158 #define REDIS_REPL_WAIT_BGSAVE_END 4 /* master waits bgsave to start bulk DB transmission */
 159 #define REDIS_REPL_SEND_BULK 5 /* master is sending the bulk DB */
 160 #define REDIS_REPL_ONLINE 6 /* bulk DB already transmitted, receive updates */
 161
 162 /* List related stuff */
 163 #define REDIS_HEAD 0
 164 #define REDIS_TAIL 1
 165
 166 /* Sort operations */
 167 #define REDIS_SORT_GET 0
 168 #define REDIS_SORT_ASC 1
 169 #define REDIS_SORT_DESC 2
 170 #define REDIS_SORTKEY_MAX 1024
 171
 172 /* Log levels */
 173 #define REDIS_DEBUG 0
 174 #define REDIS_VERBOSE 1
 175 #define REDIS_NOTICE 2
 176 #define REDIS_WARNING 3
 177
 178 /* Anti-warning macro... */
 179 #define REDIS_NOTUSED(V) ((void) V)
 180
 181 #define ZSKIPLIST_MAXLEVEL 32 /* Should be enough for 2^32 elements */
 182 #define ZSKIPLIST_P 0.25      /* Skiplist P = 1/4 */
 183
 184 /* Append only defines */
 185 #define APPENDFSYNC_NO 0
 186 #define APPENDFSYNC_ALWAYS 1
 187 #define APPENDFSYNC_EVERYSEC 2
 188
 189 /* Zip structure related defaults */
 190 #define REDIS_HASH_MAX_ZIPMAP_ENTRIES 64
 191 #define REDIS_HASH_MAX_ZIPMAP_VALUE 512
 192 #define REDIS_LIST_MAX_ZIPLIST_ENTRIES 1024
 193 #define REDIS_LIST_MAX_ZIPLIST_VALUE 32
 194 #define REDIS_SET_MAX_INTSET_ENTRIES 4096
 195
 196 /* Sets operations codes */
 197 #define REDIS_OP_UNION 0
 198 #define REDIS_OP_DIFF 1
 199 #define REDIS_OP_INTER 2
 200
 201 /* We can print the stacktrace, so our assert is defined this way: */
 202 #define redisAssert(_e) ((_e)?(void)0 : (_redisAssert(#_e,__FILE__,__LINE__),_exit(1)))
 203 #define redisPanic(_e) _redisPanic(#_e,__FILE__,__LINE__),_exit(1)
 204 void _redisAssert(char *estr, char *file, int line);
 205 void _redisPanic(char *msg, char *file, int line);
 206
 207 /*-----------------------------------------------------------------------------
 208  * Data types
 209  *----------------------------------------------------------------------------*/
 210
 211 /* A redis object, that is a type able to hold a string / list / set */
 212
 213 /* The actual Redis Object */
 214 typedef struct redisObject {
 215     unsigned type:4;
 216     unsigned storage:2;     /* REDIS_VM_MEMORY or REDIS_VM_SWAPPING */
 217     unsigned encoding:4;
 218     unsigned lru:22;        /* lru time (relative to server.lruclock) */
 219     int refcount;
 220     void *ptr;
 221     /* VM fields are only allocated if VM is active, otherwise the
 222      * object allocation function will just allocate
 223      * sizeof(redisObjct) minus sizeof(redisObjectVM), so using
 224      * Redis without VM active will not have any overhead. */
 225 } robj;
 226
 227 /* The VM pointer structure - identifies an object in the swap file.
 228  *
 229  * This object is stored in place of the value
 230  * object in the main key->value hash table representing a database.
 231  * Note that the first fields (type, storage) are the same as the redisObject
 232  * structure so that vmPointer strucuters can be accessed even when casted
 233  * as redisObject structures.
 234  *
 235  * This is useful as we don't know if a value object is or not on disk, but we
 236  * are always able to read obj->storage to check this. For vmPointer
 237  * structures "type" is set to REDIS_VMPOINTER (even if without this field
 238  * is still possible to check the kind of object from the value of 'storage').*/
 239 typedef struct vmPointer {
 240     unsigned type:4;
 241     unsigned storage:2; /* REDIS_VM_SWAPPED or REDIS_VM_LOADING */
 242     unsigned notused:26;
 243     unsigned int vtype; /* type of the object stored in the swap file */
 244     off_t page;         /* the page at witch the object is stored on disk */
 245     off_t usedpages;    /* number of pages used on disk */
 246 } vmpointer;
 247
 248 /* Macro used to initalize a Redis object allocated on the stack.
 249  * Note that this macro is taken near the structure definition to make sure
 250  * we'll update it when the structure is changed, to avoid bugs like
 251  * bug #85 introduced exactly in this way. */
 252 #define initStaticStringObject(_var,_ptr) do { \
 253     _var.refcount = 1; \
 254     _var.type = REDIS_STRING; \
 255     _var.encoding = REDIS_ENCODING_RAW; \
 256     _var.ptr = _ptr; \
 257     _var.storage = REDIS_VM_MEMORY; \
 258 } while(0);
 259
 260 typedef struct redisDb {
 261     dict *dict;                 /* The keyspace for this DB */
 262     dict *expires;              /* Timeout of keys with a timeout set */
 263     dict *blocking_keys;        /* Keys with clients waiting for data (BLPOP) */
 264     dict *io_keys;              /* Keys with clients waiting for VM I/O */
 265     dict *watched_keys;         /* WATCHED keys for MULTI/EXEC CAS */
 266     int id;
 267 } redisDb;
 268
 269 /* Client MULTI/EXEC state */
 270 typedef struct multiCmd {
 271     robj **argv;
 272     int argc;
 273     struct redisCommand *cmd;
 274 } multiCmd;
 275
 276 typedef struct multiState {
 277     multiCmd *commands;     /* Array of MULTI commands */
 278     int count;              /* Total number of MULTI commands */
 279 } multiState;
 280
 281 /* With multiplexing we need to take per-clinet state.
 282  * Clients are taken in a liked list. */
 283 typedef struct redisClient {
 284     int fd;
 285     redisDb *db;
 286     int dictid;
 287     sds querybuf;
 288     robj **argv, **mbargv;
 289     int argc, mbargc;
 290     long bulklen;            /* bulk read len. -1 if not in bulk read mode */
 291     int multibulk;          /* multi bulk command format active */
 292     list *reply;
 293     int sentlen;
 294     time_t lastinteraction; /* time of the last interaction, used for timeout */
 295     int flags;              /* REDIS_SLAVE | REDIS_MONITOR | REDIS_MULTI ... */
 296     int slaveseldb;         /* slave selected db, if this client is a slave */
 297     int authenticated;      /* when requirepass is non-NULL */
 298     int replstate;          /* replication state if this is a slave */
 299     int repldbfd;           /* replication DB file descriptor */
 300     long repldboff;         /* replication DB file offset */
 301     off_t repldbsize;       /* replication DB file size */
 302     multiState mstate;      /* MULTI/EXEC state */
 303     robj **blocking_keys;   /* The key we are waiting to terminate a blocking
 304                              * operation such as BLPOP. Otherwise NULL. */
 305     int blocking_keys_num;  /* Number of blocking keys */
 306     time_t blockingto;      /* Blocking operation timeout. If UNIX current time
 307                              * is >= blockingto then the operation timed out. */
 308     list *io_keys;          /* Keys this client is waiting to be loaded from the
 309                              * swap file in order to continue. */
 310     list *watched_keys;     /* Keys WATCHED for MULTI/EXEC CAS */
 311     dict *pubsub_channels;  /* channels a client is interested in (SUBSCRIBE) */
 312     list *pubsub_patterns;  /* patterns a client is interested in (SUBSCRIBE) */
 313
 314     /* Response buffer */
 315     int bufpos;
 316     int buflen;
 317     char buf[];
 318 } redisClient;
 319
 320 struct saveparam {
 321     time_t seconds;
 322     int changes;
 323 };
 324
 325 struct sharedObjectsStruct {
 326     robj *crlf, *ok, *err, *emptybulk, *czero, *cone, *cnegone, *pong, *space,
 327     *colon, *nullbulk, *nullmultibulk, *queued,
 328     *emptymultibulk, *wrongtypeerr, *nokeyerr, *syntaxerr, *sameobjecterr,
 329     *outofrangeerr, *plus,
 330     *select0, *select1, *select2, *select3, *select4,
 331     *select5, *select6, *select7, *select8, *select9,
 332     *messagebulk, *pmessagebulk, *subscribebulk, *unsubscribebulk, *mbulk3,
 333     *mbulk4, *psubscribebulk, *punsubscribebulk,
 334     *integers[REDIS_SHARED_INTEGERS];
 335 };
 336
 337 /* Global server state structure */
 338 struct redisServer {
 339     pthread_t mainthread;
 340     int port;
 341     int fd;
 342     redisDb *db;
 343     long long dirty;            /* changes to DB from the last save */
 344     long long dirty_before_bgsave; /* used to restore dirty on failed BGSAVE */
 345     list *clients;
 346     list *slaves, *monitors;
 347     char neterr[ANET_ERR_LEN];
 348     aeEventLoop *el;
 349     int cronloops;              /* number of times the cron function run */
 350     list *objfreelist;          /* A list of freed objects to avoid malloc() */
 351     time_t lastsave;            /* Unix time of last save succeeede */
 352     /* Fields used only for stats */
 353     time_t stat_starttime;         /* server start time */
 354     long long stat_numcommands;    /* number of processed commands */
 355     long long stat_numconnections; /* number of connections received */
 356     long long stat_expiredkeys;   /* number of expired keys */
 357     /* Configuration */
 358     int verbosity;
 359     int glueoutputbuf;
 360     int maxidletime;
 361     int dbnum;
 362     int daemonize;
 363     int appendonly;
 364     int appendfsync;
 365     int no_appendfsync_on_rewrite;
 366     int shutdown_asap;
 367     time_t lastfsync;
 368     int appendfd;
 369     int appendseldb;
 370     char *pidfile;
 371     pid_t bgsavechildpid;
 372     pid_t bgrewritechildpid;
 373     sds bgrewritebuf; /* buffer taken by parent during oppend only rewrite */
 374     sds aofbuf;       /* AOF buffer, written before entering the event loop */
 375     struct saveparam *saveparams;
 376     int saveparamslen;
 377     char *logfile;
 378     char *bindaddr;
 379     char *dbfilename;
 380     char *appendfilename;
 381     char *requirepass;
 382     int rdbcompression;
 383     int activerehashing;
 384     /* Replication related */
 385     int isslave;
 386     char *masterauth;
 387     char *masterhost;
 388     int masterport;
 389     redisClient *master;    /* client that is master for this slave */
 390     int replstate;
 391     unsigned int maxclients;
 392     unsigned long long maxmemory;
 393     unsigned int blpop_blocked_clients;
 394     unsigned int vm_blocked_clients;
 395     /* Sort parameters - qsort_r() is only available under BSD so we
 396      * have to take this state global, in order to pass it to sortCompare() */
 397     int sort_desc;
 398     int sort_alpha;
 399     int sort_bypattern;
 400     /* Virtual memory configuration */
 401     int vm_enabled;
 402     char *vm_swap_file;
 403     off_t vm_page_size;
 404     off_t vm_pages;
 405     unsigned long long vm_max_memory;
 406     /* Zip structure config */
 407     size_t hash_max_zipmap_entries;
 408     size_t hash_max_zipmap_value;
 409     size_t list_max_ziplist_entries;
 410     size_t list_max_ziplist_value;
 411     size_t set_max_intset_entries;
 412     /* Virtual memory state */
 413     FILE *vm_fp;
 414     int vm_fd;
 415     off_t vm_next_page; /* Next probably empty page */
 416     off_t vm_near_pages; /* Number of pages allocated sequentially */
 417     unsigned char *vm_bitmap; /* Bitmap of free/used pages */
 418     time_t unixtime;    /* Unix time sampled every second. */
 419     /* Virtual memory I/O threads stuff */
 420     /* An I/O thread process an element taken from the io_jobs queue and
 421      * put the result of the operation in the io_done list. While the
 422      * job is being processed, it's put on io_processing queue. */
 423     list *io_newjobs; /* List of VM I/O jobs yet to be processed */
 424     list *io_processing; /* List of VM I/O jobs being processed */
 425     list *io_processed; /* List of VM I/O jobs already processed */
 426     list *io_ready_clients; /* Clients ready to be unblocked. All keys loaded */
 427     pthread_mutex_t io_mutex; /* lock to access io_jobs/io_done/io_thread_job */
 428     pthread_mutex_t obj_freelist_mutex; /* safe redis objects creation/free */
 429     pthread_mutex_t io_swapfile_mutex; /* So we can lseek + write */
 430     pthread_attr_t io_threads_attr; /* attributes for threads creation */
 431     int io_active_threads; /* Number of running I/O threads */
 432     int vm_max_threads; /* Max number of I/O threads running at the same time */
 433     /* Our main thread is blocked on the event loop, locking for sockets ready
 434      * to be read or written, so when a threaded I/O operation is ready to be
 435      * processed by the main thread, the I/O thread will use a unix pipe to
 436      * awake the main thread. The followings are the two pipe FDs. */
 437     int io_ready_pipe_read;
 438     int io_ready_pipe_write;
 439     /* Virtual memory stats */
 440     unsigned long long vm_stats_used_pages;
 441     unsigned long long vm_stats_swapped_objects;
 442     unsigned long long vm_stats_swapouts;
 443     unsigned long long vm_stats_swapins;
 444     /* Pubsub */
 445     dict *pubsub_channels; /* Map channels to list of subscribed clients */
 446     list *pubsub_patterns; /* A list of pubsub_patterns */
 447     /* Misc */
 448     FILE *devnull;
 449     unsigned lruclock:22;        /* clock incrementing every minute, for LRU */
 450     unsigned lruclock_padding:10;
 451 };
 452
 453 typedef struct pubsubPattern {
 454     redisClient *client;
 455     robj *pattern;
 456 } pubsubPattern;
 457
 458 typedef void redisCommandProc(redisClient *c);
 459 typedef void redisVmPreloadProc(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 460 struct redisCommand {
 461     char *name;
 462     redisCommandProc *proc;
 463     int arity;
 464     int flags;
 465     /* Use a function to determine which keys need to be loaded
 466      * in the background prior to executing this command. Takes precedence
 467      * over vm_firstkey and others, ignored when NULL */
 468     redisVmPreloadProc *vm_preload_proc;
 469     /* What keys should be loaded in background when calling this command? */
 470     int vm_firstkey; /* The first argument that's a key (0 = no keys) */
 471     int vm_lastkey;  /* THe last argument that's a key */
 472     int vm_keystep;  /* The step between first and last key */
 473 };
 474
 475 struct redisFunctionSym {
 476     char *name;
 477     unsigned long pointer;
 478 };
 479
 480 typedef struct _redisSortObject {
 481     robj *obj;
 482     union {
 483         double score;
 484         robj *cmpobj;
 485     } u;
 486 } redisSortObject;
 487
 488 typedef struct _redisSortOperation {
 489     int type;
 490     robj *pattern;
 491 } redisSortOperation;
 492
 493 /* ZSETs use a specialized version of Skiplists */
 494
 495 typedef struct zskiplistNode {
 496     struct zskiplistNode **forward;
 497     struct zskiplistNode *backward;
 498     unsigned int *span;
 499     double score;
 500     robj *obj;
 501 } zskiplistNode;
 502
 503 typedef struct zskiplist {
 504     struct zskiplistNode *header, *tail;
 505     unsigned long length;
 506     int level;
 507 } zskiplist;
 508
 509 typedef struct zset {
 510     dict *dict;
 511     zskiplist *zsl;
 512 } zset;
 513
 514 /* VM threaded I/O request message */
 515 #define REDIS_IOJOB_LOAD 0          /* Load from disk to memory */
 516 #define REDIS_IOJOB_PREPARE_SWAP 1  /* Compute needed pages */
 517 #define REDIS_IOJOB_DO_SWAP 2       /* Swap from memory to disk */
 518 typedef struct iojob {
 519     int type;   /* Request type, REDIS_IOJOB_* */
 520     redisDb *db;/* Redis database */
 521     robj *key;  /* This I/O request is about swapping this key */
 522     robj *id;   /* Unique identifier of this job:
 523                    this is the object to swap for REDIS_IOREQ_*_SWAP, or the
 524                    vmpointer objct for REDIS_IOREQ_LOAD. */
 525     robj *val;  /* the value to swap for REDIS_IOREQ_*_SWAP, otherwise this
 526                  * field is populated by the I/O thread for REDIS_IOREQ_LOAD. */
 527     off_t page; /* Swap page where to read/write the object */
 528     off_t pages; /* Swap pages needed to save object. PREPARE_SWAP return val */
 529     int canceled; /* True if this command was canceled by blocking side of VM */
 530     pthread_t thread; /* ID of the thread processing this entry */
 531 } iojob;
 532
 533 /* Structure to hold list iteration abstraction. */
 534 typedef struct {
 535     robj *subject;
 536     unsigned char encoding;
 537     unsigned char direction; /* Iteration direction */
 538     unsigned char *zi;
 539     listNode *ln;
 540 } listTypeIterator;
 541
 542 /* Structure for an entry while iterating over a list. */
 543 typedef struct {
 544     listTypeIterator *li;
 545     unsigned char *zi;  /* Entry in ziplist */
 546     listNode *ln;       /* Entry in linked list */
 547 } listTypeEntry;
 548
 549 /* Structure to hold set iteration abstraction. */
 550 typedef struct {
 551     robj *subject;
 552     int encoding;
 553     int ii; /* intset iterator */
 554     dictIterator *di;
 555 } setTypeIterator;
 556
 557 /* Structure to hold hash iteration abstration. Note that iteration over
 558  * hashes involves both fields and values. Because it is possible that
 559  * not both are required, store pointers in the iterator to avoid
 560  * unnecessary memory allocation for fields/values. */
 561 typedef struct {
 562     int encoding;
 563     unsigned char *zi;
 564     unsigned char *zk, *zv;
 565     unsigned int zklen, zvlen;
 566
 567     dictIterator *di;
 568     dictEntry *de;
 569 } hashTypeIterator;
 570
 571 #define REDIS_HASH_KEY 1
 572 #define REDIS_HASH_VALUE 2
 573
 574 /*-----------------------------------------------------------------------------
 575  * Extern declarations
 576  *----------------------------------------------------------------------------*/
 577
 578 extern struct redisServer server;
 579 extern struct sharedObjectsStruct shared;
 580 extern dictType setDictType;
 581 extern dictType zsetDictType;
 582 extern double R_Zero, R_PosInf, R_NegInf, R_Nan;
 583 dictType hashDictType;
 584
 585 /*-----------------------------------------------------------------------------
 586  * Functions prototypes
 587  *----------------------------------------------------------------------------*/
 588
 589 /* networking.c -- Networking and Client related operations */
 590 redisClient *createClient(int fd);
 591 void closeTimedoutClients(void);
 592 void freeClient(redisClient *c);
 593 void resetClient(redisClient *c);
 594 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
 595 void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
 596 void addReply(redisClient *c, robj *obj);
 597 void *addDeferredMultiBulkLength(redisClient *c);
 598 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);
 599 void addReplySds(redisClient *c, sds s);
 600 void processInputBuffer(redisClient *c);
 601 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 602 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
 603 void addReplyBulk(redisClient *c, robj *obj);
 604 void addReplyBulkCString(redisClient *c, char *s);
 605 void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 606 void addReply(redisClient *c, robj *obj);
 607 void addReplySds(redisClient *c, sds s);
 608 void addReplyDouble(redisClient *c, double d);
 609 void addReplyLongLong(redisClient *c, long long ll);
 610 void addReplyMultiBulkLen(redisClient *c, long length);
 611 void *dupClientReplyValue(void *o);
 612
 613 /* List data type */
 614 void listTypeTryConversion(robj *subject, robj *value);
 615 void listTypePush(robj *subject, robj *value, int where);
 616 robj *listTypePop(robj *subject, int where);
 617 unsigned long listTypeLength(robj *subject);
 618 listTypeIterator *listTypeInitIterator(robj *subject, int index, unsigned char direction);
 619 void listTypeReleaseIterator(listTypeIterator *li);
 620 int listTypeNext(listTypeIterator *li, listTypeEntry *entry);
 621 robj *listTypeGet(listTypeEntry *entry);
 622 void listTypeInsert(listTypeEntry *entry, robj *value, int where);
 623 int listTypeEqual(listTypeEntry *entry, robj *o);
 624 void listTypeDelete(listTypeEntry *entry);
 625 void listTypeConvert(robj *subject, int enc);
 626 void unblockClientWaitingData(redisClient *c);
 627 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele);
 628 void popGenericCommand(redisClient *c, int where);
 629
 630 /* MULTI/EXEC/WATCH... */
 631 void unwatchAllKeys(redisClient *c);
 632 void initClientMultiState(redisClient *c);
 633 void freeClientMultiState(redisClient *c);
 634 void queueMultiCommand(redisClient *c, struct redisCommand *cmd);
 635 void touchWatchedKey(redisDb *db, robj *key);
 636 void touchWatchedKeysOnFlush(int dbid);
 637
 638 /* Redis object implementation */
 639 void decrRefCount(void *o);
 640 void incrRefCount(robj *o);
 641 void freeStringObject(robj *o);
 642 void freeListObject(robj *o);
 643 void freeSetObject(robj *o);
 644 void freeZsetObject(robj *o);
 645 void freeHashObject(robj *o);
 646 robj *createObject(int type, void *ptr);
 647 robj *createStringObject(char *ptr, size_t len);
 648 robj *dupStringObject(robj *o);
 649 robj *tryObjectEncoding(robj *o);
 650 robj *getDecodedObject(robj *o);
 651 size_t stringObjectLen(robj *o);
 652 int tryFreeOneObjectFromFreelist(void);
 653 robj *createStringObjectFromLongLong(long long value);
 654 robj *createListObject(void);
 655 robj *createZiplistObject(void);
 656 robj *createSetObject(void);
 657 robj *createIntsetObject(void);
 658 robj *createHashObject(void);
 659 robj *createZsetObject(void);
 660 int getLongFromObjectOrReply(redisClient *c, robj *o, long *target, const char *msg);
 661 int checkType(redisClient *c, robj *o, int type);
 662 int getLongLongFromObjectOrReply(redisClient *c, robj *o, long long *target, const char *msg);
 663 int getDoubleFromObjectOrReply(redisClient *c, robj *o, double *target, const char *msg);
 664 int getLongLongFromObject(robj *o, long long *target);
 665 char *strEncoding(int encoding);
 666 int compareStringObjects(robj *a, robj *b);
 667 int equalStringObjects(robj *a, robj *b);
 668
 669 /* Replication */
 670 void replicationFeedSlaves(list *slaves, int dictid, robj **argv, int argc);
 671 void replicationFeedMonitors(list *monitors, int dictid, robj **argv, int argc);
 672 int syncWithMaster(void);
 673 void updateSlavesWaitingBgsave(int bgsaveerr);
 674
 675 /* RDB persistence */
 676 int rdbLoad(char *filename);
 677 int rdbSaveBackground(char *filename);
 678 void rdbRemoveTempFile(pid_t childpid);
 679 int rdbSave(char *filename);
 680 int rdbSaveObject(FILE *fp, robj *o);
 681 off_t rdbSavedObjectPages(robj *o, FILE *fp);
 682 off_t rdbSavedObjectLen(robj *o, FILE *fp);
 683 robj *rdbLoadObject(int type, FILE *fp);
 684 void backgroundSaveDoneHandler(int statloc);
 685
 686 /* AOF persistence */
 687 void flushAppendOnlyFile(void);
 688 void feedAppendOnlyFile(struct redisCommand *cmd, int dictid, robj **argv, int argc);
 689 void aofRemoveTempFile(pid_t childpid);
 690 int rewriteAppendOnlyFileBackground(void);
 691 int loadAppendOnlyFile(char *filename);
 692 void stopAppendOnly(void);
 693 int startAppendOnly(void);
 694 void backgroundRewriteDoneHandler(int statloc);
 695
 696 /* Sorted sets data type */
 697 zskiplist *zslCreate(void);
 698 void zslFree(zskiplist *zsl);
 699 void zslInsert(zskiplist *zsl, double score, robj *obj);
 700
 701 /* Core functions */
 702 void freeMemoryIfNeeded(void);
 703 int processCommand(redisClient *c);
 704 void setupSigSegvAction(void);
 705 struct redisCommand *lookupCommand(char *name);
 706 void call(redisClient *c, struct redisCommand *cmd);
 707 int prepareForShutdown();
 708 void redisLog(int level, const char *fmt, ...);
 709 void usage();
 710 void updateDictResizePolicy(void);
 711 int htNeedsResize(dict *dict);
 712 void oom(const char *msg);
 713
 714 /* Virtual Memory */
 715 void vmInit(void);
 716 void vmMarkPagesFree(off_t page, off_t count);
 717 robj *vmLoadObject(robj *o);
 718 robj *vmPreviewObject(robj *o);
 719 int vmSwapOneObjectBlocking(void);
 720 int vmSwapOneObjectThreaded(void);
 721 int vmCanSwapOut(void);
 722 void vmThreadedIOCompletedJob(aeEventLoop *el, int fd, void *privdata, int mask);
 723 void vmCancelThreadedIOJob(robj *o);
 724 void lockThreadedIO(void);
 725 void unlockThreadedIO(void);
 726 int vmSwapObjectThreaded(robj *key, robj *val, redisDb *db);
 727 void freeIOJob(iojob *j);
 728 void queueIOJob(iojob *j);
 729 int vmWriteObjectOnSwap(robj *o, off_t page);
 730 robj *vmReadObjectFromSwap(off_t page, int type);
 731 void waitEmptyIOJobsQueue(void);
 732 void vmReopenSwapFile(void);
 733 int vmFreePage(off_t page);
 734 void zunionInterBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 735 void execBlockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd, int argc, robj **argv);
 736 int blockClientOnSwappedKeys(redisClient *c, struct redisCommand *cmd);
 737 int dontWaitForSwappedKey(redisClient *c, robj *key);
 738 void handleClientsBlockedOnSwappedKey(redisDb *db, robj *key);
 739 vmpointer *vmSwapObjectBlocking(robj *val);
 740
 741 /* Set data type */
 742 robj *setTypeCreate(robj *value);
 743 int setTypeAdd(robj *subject, robj *value);
 744 int setTypeRemove(robj *subject, robj *value);
 745 int setTypeIsMember(robj *subject, robj *value);
 746 setTypeIterator *setTypeInitIterator(robj *subject);
 747 void setTypeReleaseIterator(setTypeIterator *si);
 748 robj *setTypeNext(setTypeIterator *si);
 749 robj *setTypeRandomElement(robj *subject);
 750 unsigned long setTypeSize(robj *subject);
 751 void setTypeConvert(robj *subject, int enc);
 752
 753 /* Hash data type */
 754 void convertToRealHash(robj *o);
 755 void hashTypeTryConversion(robj *subject, robj **argv, int start, int end);
 756 void hashTypeTryObjectEncoding(robj *subject, robj **o1, robj **o2);
 757 robj *hashTypeGet(robj *o, robj *key);
 758 int hashTypeExists(robj *o, robj *key);
 759 int hashTypeSet(robj *o, robj *key, robj *value);
 760 int hashTypeDelete(robj *o, robj *key);
 761 unsigned long hashTypeLength(robj *o);
 762 hashTypeIterator *hashTypeInitIterator(robj *subject);
 763 void hashTypeReleaseIterator(hashTypeIterator *hi);
 764 int hashTypeNext(hashTypeIterator *hi);
 765 robj *hashTypeCurrent(hashTypeIterator *hi, int what);
 766 robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key);
 767
 768 /* Pub / Sub */
 769 int pubsubUnsubscribeAllChannels(redisClient *c, int notify);
 770 int pubsubUnsubscribeAllPatterns(redisClient *c, int notify);
 771 void freePubsubPattern(void *p);
 772 int listMatchPubsubPattern(void *a, void *b);
 773
 774 /* Utility functions */
 775 int stringmatchlen(const char *pattern, int patternLen,
 776         const char *string, int stringLen, int nocase);
 777 int stringmatch(const char *pattern, const char *string, int nocase);
 778 long long memtoll(const char *p, int *err);
 779 int ll2string(char *s, size_t len, long long value);
 780 int isStringRepresentableAsLong(sds s, long *longval);
 781 int isStringRepresentableAsLongLong(sds s, long long *longval);
 782 int isObjectRepresentableAsLongLong(robj *o, long long *llongval);
 783
 784 /* Configuration */
 785 void loadServerConfig(char *filename);
 786 void appendServerSaveParams(time_t seconds, int changes);
 787 void resetServerSaveParams();
 788
 789 /* db.c -- Keyspace access API */
 790 int removeExpire(redisDb *db, robj *key);
 791 void propagateExpire(redisDb *db, robj *key);
 792 int expireIfNeeded(redisDb *db, robj *key);
 793 time_t getExpire(redisDb *db, robj *key);
 794 void setExpire(redisDb *db, robj *key, time_t when);
 795 robj *lookupKey(redisDb *db, robj *key);
 796 robj *lookupKeyRead(redisDb *db, robj *key);
 797 robj *lookupKeyWrite(redisDb *db, robj *key);
 798 robj *lookupKeyReadOrReply(redisClient *c, robj *key, robj *reply);
 799 robj *lookupKeyWriteOrReply(redisClient *c, robj *key, robj *reply);
 800 int dbAdd(redisDb *db, robj *key, robj *val);
 801 int dbReplace(redisDb *db, robj *key, robj *val);
 802 int dbExists(redisDb *db, robj *key);
 803 robj *dbRandomKey(redisDb *db);
 804 int dbDelete(redisDb *db, robj *key);
 805 long long emptyDb();
 806 int selectDb(redisClient *c, int id);
 807
 808 /* Git SHA1 */
 809 char *redisGitSHA1(void);
 810 char *redisGitDirty(void);
 811
 812 /* Commands prototypes */
 813 void authCommand(redisClient *c);
 814 void pingCommand(redisClient *c);
 815 void echoCommand(redisClient *c);
 816 void setCommand(redisClient *c);
 817 void setnxCommand(redisClient *c);
 818 void setexCommand(redisClient *c);
 819 void getCommand(redisClient *c);
 820 void delCommand(redisClient *c);
 821 void existsCommand(redisClient *c);
 822 void incrCommand(redisClient *c);
 823 void decrCommand(redisClient *c);
 824 void incrbyCommand(redisClient *c);
 825 void decrbyCommand(redisClient *c);
 826 void selectCommand(redisClient *c);
 827 void randomkeyCommand(redisClient *c);
 828 void keysCommand(redisClient *c);
 829 void dbsizeCommand(redisClient *c);
 830 void lastsaveCommand(redisClient *c);
 831 void saveCommand(redisClient *c);
 832 void bgsaveCommand(redisClient *c);
 833 void bgrewriteaofCommand(redisClient *c);
 834 void shutdownCommand(redisClient *c);
 835 void moveCommand(redisClient *c);
 836 void renameCommand(redisClient *c);
 837 void renamenxCommand(redisClient *c);
 838 void lpushCommand(redisClient *c);
 839 void rpushCommand(redisClient *c);
 840 void lpushxCommand(redisClient *c);
 841 void rpushxCommand(redisClient *c);
 842 void linsertCommand(redisClient *c);
 843 void lpopCommand(redisClient *c);
 844 void rpopCommand(redisClient *c);
 845 void llenCommand(redisClient *c);
 846 void lindexCommand(redisClient *c);
 847 void lrangeCommand(redisClient *c);
 848 void ltrimCommand(redisClient *c);
 849 void typeCommand(redisClient *c);
 850 void lsetCommand(redisClient *c);
 851 void saddCommand(redisClient *c);
 852 void sremCommand(redisClient *c);
 853 void smoveCommand(redisClient *c);
 854 void sismemberCommand(redisClient *c);
 855 void scardCommand(redisClient *c);
 856 void spopCommand(redisClient *c);
 857 void srandmemberCommand(redisClient *c);
 858 void sinterCommand(redisClient *c);
 859 void sinterstoreCommand(redisClient *c);
 860 void sunionCommand(redisClient *c);
 861 void sunionstoreCommand(redisClient *c);
 862 void sdiffCommand(redisClient *c);
 863 void sdiffstoreCommand(redisClient *c);
 864 void syncCommand(redisClient *c);
 865 void flushdbCommand(redisClient *c);
 866 void flushallCommand(redisClient *c);
 867 void sortCommand(redisClient *c);
 868 void lremCommand(redisClient *c);
 869 void rpoplpushcommand(redisClient *c);
 870 void infoCommand(redisClient *c);
 871 void mgetCommand(redisClient *c);
 872 void monitorCommand(redisClient *c);
 873 void expireCommand(redisClient *c);
 874 void expireatCommand(redisClient *c);
 875 void getsetCommand(redisClient *c);
 876 void ttlCommand(redisClient *c);
 877 void persistCommand(redisClient *c);
 878 void slaveofCommand(redisClient *c);
 879 void debugCommand(redisClient *c);
 880 void msetCommand(redisClient *c);
 881 void msetnxCommand(redisClient *c);
 882 void zaddCommand(redisClient *c);
 883 void zincrbyCommand(redisClient *c);
 884 void zrangeCommand(redisClient *c);
 885 void zrangebyscoreCommand(redisClient *c);
 886 void zcountCommand(redisClient *c);
 887 void zrevrangeCommand(redisClient *c);
 888 void zcardCommand(redisClient *c);
 889 void zremCommand(redisClient *c);
 890 void zscoreCommand(redisClient *c);
 891 void zremrangebyscoreCommand(redisClient *c);
 892 void multiCommand(redisClient *c);
 893 void execCommand(redisClient *c);
 894 void discardCommand(redisClient *c);
 895 void blpopCommand(redisClient *c);
 896 void brpopCommand(redisClient *c);
 897 void appendCommand(redisClient *c);
 898 void substrCommand(redisClient *c);
 899 void strlenCommand(redisClient *c);
 900 void zrankCommand(redisClient *c);
 901 void zrevrankCommand(redisClient *c);
 902 void hsetCommand(redisClient *c);
 903 void hsetnxCommand(redisClient *c);
 904 void hgetCommand(redisClient *c);
 905 void hmsetCommand(redisClient *c);
 906 void hmgetCommand(redisClient *c);
 907 void hdelCommand(redisClient *c);
 908 void hlenCommand(redisClient *c);
 909 void zremrangebyrankCommand(redisClient *c);
 910 void zunionstoreCommand(redisClient *c);
 911 void zinterstoreCommand(redisClient *c);
 912 void hkeysCommand(redisClient *c);
 913 void hvalsCommand(redisClient *c);
 914 void hgetallCommand(redisClient *c);
 915 void hexistsCommand(redisClient *c);
 916 void configCommand(redisClient *c);
 917 void hincrbyCommand(redisClient *c);
 918 void subscribeCommand(redisClient *c);
 919 void unsubscribeCommand(redisClient *c);
 920 void psubscribeCommand(redisClient *c);
 921 void punsubscribeCommand(redisClient *c);
 922 void publishCommand(redisClient *c);
 923 void watchCommand(redisClient *c);
 924 void unwatchCommand(redisClient *c);
 925
 926 #if defined(__GNUC__)
 927 void *calloc(size_t count, size_t size) __attribute__ ((deprecated));
 928 void free(void *ptr) __attribute__ ((deprecated));
 929 void *malloc(size_t size) __attribute__ ((deprecated));
 930 void *realloc(void *ptr, size_t size) __attribute__ ((deprecated));
 931 #endif
 932
 933 #endif