X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/8a979f039011a4672b1052ee84ca56f214e6a681..e3c51c4b1bb60069bbd6552fe9109885b886aa86:/src/t_list.c

diff --git a/src/t_list.c b/src/t_list.c
index 10e7f72c..f5739792 100644
--- a/src/t_list.c
+++ b/src/t_list.c
@@ -689,17 +689,23 @@ void rpoplpushCommand(redisClient *c) {
 
 /* Set a client in blocking mode for the specified key, with the specified
  * timeout */
-void blockForKeys(redisClient *c, robj **keys, int numkeys, time_t timeout) {
+void blockForKeys(redisClient *c, robj **keys, int numkeys, time_t timeout, robj *target) {
     dictEntry *de;
     list *l;
     int j;
 
-    c->blocking_keys = zmalloc(sizeof(robj*)*numkeys);
-    c->blocking_keys_num = numkeys;
-    c->blockingto = timeout;
+    c->bpop.keys = zmalloc(sizeof(robj*)*numkeys);
+    c->bpop.count = numkeys;
+    c->bpop.timeout = timeout;
+    c->bpop.target = target;
+
+    if (target != NULL) {
+      incrRefCount(target);
+    }
+
     for (j = 0; j < numkeys; j++) {
         /* Add the key in the client structure, to map clients -> keys */
-        c->blocking_keys[j] = keys[j];
+        c->bpop.keys[j] = keys[j];
         incrRefCount(keys[j]);
 
         /* And in the other "side", to map keys -> clients */
@@ -728,22 +734,28 @@ void unblockClientWaitingData(redisClient *c) {
     list *l;
     int j;
 
-    redisAssert(c->blocking_keys != NULL);
+    redisAssert(c->bpop.keys != NULL);
     /* The client may wait for multiple keys, so unblock it for every key. */
-    for (j = 0; j < c->blocking_keys_num; j++) {
+    for (j = 0; j < c->bpop.count; j++) {
         /* Remove this client from the list of clients waiting for this key. */
-        de = dictFind(c->db->blocking_keys,c->blocking_keys[j]);
+        de = dictFind(c->db->blocking_keys,c->bpop.keys[j]);
         redisAssert(de != NULL);
         l = dictGetEntryVal(de);
         listDelNode(l,listSearchKey(l,c));
         /* If the list is empty we need to remove it to avoid wasting memory */
         if (listLength(l) == 0)
-            dictDelete(c->db->blocking_keys,c->blocking_keys[j]);
-        decrRefCount(c->blocking_keys[j]);
+            dictDelete(c->db->blocking_keys,c->bpop.keys[j]);
+        decrRefCount(c->bpop.keys[j]);
     }
+
+    if (c->bpop.target != NULL) {
+        decrRefCount(c->bpop.target);
+    }
+
     /* Cleanup the client structure */
-    zfree(c->blocking_keys);
-    c->blocking_keys = NULL;
+    zfree(c->bpop.keys);
+    c->bpop.keys = NULL;
+    c->bpop.target = NULL;
     c->flags &= (~REDIS_BLOCKED);
     server.blpop_blocked_clients--;
     /* We want to process data if there is some command waiting
@@ -777,27 +789,60 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
     redisAssert(ln != NULL);
     receiver = ln->value;
 
-    addReplyMultiBulkLen(receiver,2);
-    addReplyBulk(receiver,key);
-    addReplyBulk(receiver,ele);
+    if (receiver->bpop.target == NULL) {
+        /* BRPOP/BLPOP return a multi-bulk with the name
+         * of the popped list */
+        addReplyMultiBulkLen(receiver,2);
+        addReplyBulk(receiver,key);
+        addReplyBulk(receiver,ele);
+    }
+    else {
+        /* BRPOPLPUSH */
+        robj *dobj = lookupKeyWrite(receiver->db,receiver->bpop.target);
+        if (dobj && checkType(receiver,dobj,REDIS_LIST)) return 0;
+
+        addReplyBulk(receiver,ele);
+
+        if (!handleClientsWaitingListPush(receiver, receiver->bpop.target, ele)) {
+            /* Create the list if the key does not exist */
+            if (!dobj) {
+                dobj = createZiplistObject();
+                dbAdd(receiver->db, receiver->bpop.target, dobj);
+            }
+
+            listTypePush(dobj, ele, REDIS_HEAD);
+        }
+    }
+
     unblockClientWaitingData(receiver);
     return 1;
 }
 
+int checkTimeout(redisClient *c, robj *object, time_t *timeout) {
+    long long lltimeout;
+
+    if (getLongLongFromObject(object, &lltimeout) != REDIS_OK) {
+        addReplyError(c, "timeout is not an integer");
+        return REDIS_ERR;
+    }
+
+    if (lltimeout < 0) {
+        addReplyError(c, "timeout is negative");
+        return REDIS_ERR;
+    }
+
+    *timeout = lltimeout;
+
+    return REDIS_OK;
+}
+
 /* Blocking RPOP/LPOP */
 void blockingPopGenericCommand(redisClient *c, int where) {
     robj *o;
-    long long lltimeout;
     time_t timeout;
     int j;
 
-    /* Make sure timeout is an integer value */
-    if (getLongLongFromObjectOrReply(c,c->argv[c->argc-1],&lltimeout,
-            "timeout is not an integer") != REDIS_OK) return;
-
-    /* Make sure the timeout is not negative */
-    if (lltimeout < 0) {
-        addReplyError(c,"timeout is negative");
+    if (checkTimeout(c, c->argv[c->argc - 1], &timeout) != REDIS_OK) {
         return;
     }
 
@@ -829,11 +874,13 @@ void blockingPopGenericCommand(redisClient *c, int where) {
                      * because it is... */
                     addReplyMultiBulkLen(c,2);
                     addReplyBulk(c,argv[1]);
+
                     popGenericCommand(c,where);
 
                     /* Fix the client structure with the original stuff */
                     c->argv = orig_argv;
                     c->argc = orig_argc;
+
                     return;
                 }
             }
@@ -848,9 +895,8 @@ void blockingPopGenericCommand(redisClient *c, int where) {
     }
 
     /* If the list is empty or the key does not exists we must block */
-    timeout = lltimeout;
     if (timeout > 0) timeout += time(NULL);
-    blockForKeys(c,c->argv+1,c->argc-2,timeout);
+    blockForKeys(c, c->argv + 1, c->argc - 2, timeout, NULL);
 }
 
 void blpopCommand(redisClient *c) {
@@ -860,3 +906,37 @@ void blpopCommand(redisClient *c) {
 void brpopCommand(redisClient *c) {
     blockingPopGenericCommand(c,REDIS_TAIL);
 }
+
+void brpoplpushCommand(redisClient *c) {
+    time_t timeout;
+
+    if (checkTimeout(c, c->argv[3], &timeout) != REDIS_OK) {
+        return;
+    }
+
+    robj *key = lookupKeyWrite(c->db, c->argv[1]);
+
+    if (key == NULL) {
+        if (c->flags & REDIS_MULTI) {
+
+            /* Blocking against an empty list in a multi state
+             * returns immediately. */
+            addReply(c, shared.nullmultibulk);
+        } else {
+            if (timeout > 0) timeout += time(NULL);
+
+            /* The list is empty and the client blocks. */
+            blockForKeys(c, c->argv + 1, 1, timeout, c->argv[2]);
+        }
+    } else {
+        if (key->type != REDIS_LIST) {
+            addReply(c, shared.wrongtypeerr);
+        } else {
+
+            /* The list exists and has elements, so
+             * the regular rpoplpushCommand is executed. */
+            redisAssert(listTypeLength(key) > 0);
+            rpoplpushCommand(c);
+        }
+    }
+}