X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/8e33831b2b93d6d0a324ca01c6934197887276d8..9514aa325192d4d59497fab560ce781b3ed90bbb:/src/t_list.c?ds=sidebyside diff --git a/src/t_list.c b/src/t_list.c index 8ee3b987..71436198 100644 --- a/src/t_list.c +++ b/src/t_list.c @@ -259,30 +259,35 @@ void listTypeConvert(robj *subject, int enc) { *----------------------------------------------------------------------------*/ void pushGenericCommand(redisClient *c, int where) { + int j, addlen = 0, pushed = 0; robj *lobj = lookupKeyWrite(c->db,c->argv[1]); - c->argv[2] = tryObjectEncoding(c->argv[2]); - if (lobj == NULL) { - if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) { - addReply(c,shared.cone); - return; - } - lobj = createZiplistObject(); - dbAdd(c->db,c->argv[1],lobj); - } else { - if (lobj->type != REDIS_LIST) { - addReply(c,shared.wrongtypeerr); - return; + int may_have_waiting_clients = (lobj == NULL); + + if (lobj && lobj->type != REDIS_LIST) { + addReply(c,shared.wrongtypeerr); + return; + } + + for (j = 2; j < c->argc; j++) { + c->argv[j] = tryObjectEncoding(c->argv[j]); + if (may_have_waiting_clients) { + if (handleClientsWaitingListPush(c,c->argv[1],c->argv[j])) { + addlen++; + continue; + } else { + may_have_waiting_clients = 0; + } } - if (handleClientsWaitingListPush(c,c->argv[1],c->argv[2])) { - touchWatchedKey(c->db,c->argv[1]); - addReply(c,shared.cone); - return; + if (!lobj) { + lobj = createZiplistObject(); + dbAdd(c->db,c->argv[1],lobj); } + listTypePush(lobj,c->argv[j],where); + pushed++; } - listTypePush(lobj,c->argv[2],where); - addReplyLongLong(c,listTypeLength(lobj)); - touchWatchedKey(c->db,c->argv[1]); - server.dirty++; + addReplyLongLong(c,addlen + (lobj ? listTypeLength(lobj) : 0)); + if (pushed) signalModifiedKey(c->db,c->argv[1]); + server.dirty += pushed; } void lpushCommand(redisClient *c) { @@ -330,7 +335,7 @@ void pushxGenericCommand(redisClient *c, robj *refval, robj *val, int where) { if (subject->encoding == REDIS_ENCODING_ZIPLIST && ziplistLen(subject->ptr) > server.list_max_ziplist_entries) listTypeConvert(subject,REDIS_ENCODING_LINKEDLIST); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; } else { /* Notify client of a failed insert */ @@ -339,7 +344,7 @@ void pushxGenericCommand(redisClient *c, robj *refval, robj *val, int where) { } } else { listTypePush(subject,val,where); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; } @@ -427,7 +432,7 @@ void lsetCommand(redisClient *c) { o->ptr = ziplistInsert(o->ptr,p,value->ptr,sdslen(value->ptr)); decrRefCount(value); addReply(c,shared.ok); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; } } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { @@ -439,7 +444,7 @@ void lsetCommand(redisClient *c) { listNodeValue(ln) = value; incrRefCount(value); addReply(c,shared.ok); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; } } else { @@ -458,7 +463,7 @@ void popGenericCommand(redisClient *c, int where) { addReplyBulk(c,value); decrRefCount(value); if (listTypeLength(o) == 0) dbDelete(c->db,c->argv[1]); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; } } @@ -514,7 +519,12 @@ void lrangeCommand(redisClient *c) { p = ziplistNext(o->ptr,p); } } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) { - listNode *ln = listIndex(o->ptr,start); + listNode *ln; + + /* If we are nearest to the end of the list, reach the element + * starting from tail and going backward, as it is faster. */ + if (start > llen/2) start -= llen; + ln = listIndex(o->ptr,start); while(rangelen--) { addReplyBulk(c,ln->value); @@ -573,7 +583,7 @@ void ltrimCommand(redisClient *c) { redisPanic("Unknown list encoding"); } if (listTypeLength(o) == 0) dbDelete(c->db,c->argv[1]); - touchWatchedKey(c->db,c->argv[1]); + signalModifiedKey(c->db,c->argv[1]); server.dirty++; addReply(c,shared.ok); } @@ -616,7 +626,7 @@ void lremCommand(redisClient *c) { if (listTypeLength(subject) == 0) dbDelete(c->db,c->argv[1]); addReplyLongLong(c,removed); - if (removed) touchWatchedKey(c->db,c->argv[1]); + if (removed) signalModifiedKey(c->db,c->argv[1]); } /* This is the semantic of this command: @@ -635,17 +645,37 @@ void lremCommand(redisClient *c) { * as well. This command was originally proposed by Ezra Zygmuntowicz. */ -void rpoplpushHandlePush(redisClient *c, robj *dstkey, robj *dstobj, robj *value) { - if (!handleClientsWaitingListPush(c,dstkey,value)) { +void rpoplpushHandlePush(redisClient *origclient, redisClient *c, robj *dstkey, robj *dstobj, robj *value) { + robj *aux; + + if (!handleClientsWaitingListPush(origclient,dstkey,value)) { /* Create the list if the key does not exist */ if (!dstobj) { dstobj = createZiplistObject(); dbAdd(c->db,dstkey,dstobj); } else { - touchWatchedKey(c->db,dstkey); - server.dirty++; + signalModifiedKey(c->db,dstkey); } listTypePush(dstobj,value,REDIS_HEAD); + /* If we are pushing as a result of LPUSH against a key + * watched by BRPOPLPUSH, we need to rewrite the command vector + * as an LPUSH. + * + * If this is called directly by RPOPLPUSH (either directly + * or via a BRPOPLPUSH where the popped list exists) + * we should replicate the RPOPLPUSH command itself. */ + if (c != origclient) { + aux = createStringObject("LPUSH",5); + rewriteClientCommandVector(origclient,3,aux,dstkey,value); + decrRefCount(aux); + } else { + /* Make sure to always use RPOPLPUSH in the replication / AOF, + * even if the original command was BRPOPLPUSH. */ + aux = createStringObject("RPOPLPUSH",9); + rewriteClientCommandVector(origclient,3,aux,c->argv[1],c->argv[2]); + decrRefCount(aux); + } + server.dirty++; } /* Always send the pushed value to the client. */ @@ -661,16 +691,22 @@ void rpoplpushCommand(redisClient *c) { addReply(c,shared.nullbulk); } else { robj *dobj = lookupKeyWrite(c->db,c->argv[2]); + robj *touchedkey = c->argv[1]; + if (dobj && checkType(c,dobj,REDIS_LIST)) return; value = listTypePop(sobj,REDIS_TAIL); - rpoplpushHandlePush(c,c->argv[2],dobj,value); + /* We saved touched key, and protect it, since rpoplpushHandlePush + * may change the client command argument vector. */ + incrRefCount(touchedkey); + rpoplpushHandlePush(c,c,c->argv[2],dobj,value); /* listTypePop returns an object with its refcount incremented */ decrRefCount(value); /* Delete the source list when it is empty */ - if (listTypeLength(sobj) == 0) dbDelete(c->db,c->argv[1]); - touchWatchedKey(c->db,c->argv[1]); + if (listTypeLength(sobj) == 0) dbDelete(c->db,touchedkey); + signalModifiedKey(c->db,touchedkey); + decrRefCount(touchedkey); server.dirty++; } } @@ -772,8 +808,10 @@ void unblockClientWaitingData(redisClient *c) { /* Cleanup the client structure */ zfree(c->bpop.keys); c->bpop.keys = NULL; + if (c->bpop.target) decrRefCount(c->bpop.target); c->bpop.target = NULL; - c->flags &= (~REDIS_BLOCKED); + c->flags &= ~REDIS_BLOCKED; + c->flags |= REDIS_UNBLOCKED; server.bpop_blocked_clients--; listAddNodeTail(server.unblocked_clients,c); } @@ -814,26 +852,28 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) { receiver = ln->value; dstkey = receiver->bpop.target; + /* Protect receiver->bpop.target, that will be freed by + * the next unblockClientWaitingData() call. */ + if (dstkey) incrRefCount(dstkey); + /* This should remove the first element of the "clients" list. */ unblockClientWaitingData(receiver); - redisAssert(ln != listFirst(clients)); if (dstkey == NULL) { /* BRPOP/BLPOP */ addReplyMultiBulkLen(receiver,2); addReplyBulk(receiver,key); addReplyBulk(receiver,ele); - return 1; + return 1; /* Serve just the first client as in B[RL]POP semantics */ } else { - /* BRPOPLPUSH */ + /* BRPOPLPUSH, note that receiver->db is always equal to c->db. */ dstobj = lookupKeyWrite(receiver->db,dstkey); - if (dstobj && checkType(receiver,dstobj,REDIS_LIST)) { - decrRefCount(dstkey); - } else { - rpoplpushHandlePush(receiver,dstkey,dstobj,ele); + if (!(dstobj && checkType(receiver,dstobj,REDIS_LIST))) { + rpoplpushHandlePush(c,receiver,dstkey,dstobj,ele); decrRefCount(dstkey); return 1; } + decrRefCount(dstkey); } } @@ -877,6 +917,7 @@ void blockingPopGenericCommand(redisClient *c, int where) { if (listTypeLength(o) != 0) { /* If the list contains elements fall back to the usual * non-blocking POP operation */ + struct redisCommand *orig_cmd; robj *argv[2], **orig_argv; int orig_argc; @@ -884,6 +925,7 @@ void blockingPopGenericCommand(redisClient *c, int where) { * popGenericCommand() as the command takes a single key. */ orig_argv = c->argv; orig_argc = c->argc; + orig_cmd = c->cmd; argv[1] = c->argv[j]; c->argv = argv; c->argc = 2; @@ -901,6 +943,7 @@ void blockingPopGenericCommand(redisClient *c, int where) { /* Fix the client structure with the original stuff */ c->argv = orig_argv; c->argc = orig_argc; + c->cmd = orig_cmd; return; } @@ -940,7 +983,7 @@ void brpoplpushCommand(redisClient *c) { /* Blocking against an empty list in a multi state * returns immediately. */ - addReply(c, shared.nullmultibulk); + addReply(c, shared.nullbulk); } else { /* The list is empty and the client blocks. */ blockForKeys(c, c->argv + 1, 1, timeout, c->argv[2]);