Merge remote branch 'jonahharris/syslog'

[redis.git] / src / t_list.c

diff --git a/src/t_list.c b/src/t_list.c
index 3ce0f992ff152ba6eed6584e348ef754144dc11e..8ee3b987215a059a73c9900c152383c7988a90a3 100644 (file)
--- a/src/t_list.c
+++ b/src/t_list.c
@@ -472,12 +472,11 @@ void rpopCommand(redisClient *c) {
 }
 
 void lrangeCommand(redisClient *c) {
-    robj *o, *value;
+    robj *o;
     int start = atoi(c->argv[2]->ptr);
     int end = atoi(c->argv[3]->ptr);
     int llen;
-    int rangelen, j;
-    listTypeEntry entry;
+    int rangelen;
 
     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.emptymultibulk)) == NULL
          || checkType(c,o,REDIS_LIST)) return;
@@ -499,14 +498,31 @@ void lrangeCommand(redisClient *c) {
 
     /* Return the result in form of a multi-bulk reply */
     addReplyMultiBulkLen(c,rangelen);
-    listTypeIterator *li = listTypeInitIterator(o,start,REDIS_TAIL);
-    for (j = 0; j < rangelen; j++) {
-        redisAssert(listTypeNext(li,&entry));
-        value = listTypeGet(&entry);
-        addReplyBulk(c,value);
-        decrRefCount(value);
+    if (o->encoding == REDIS_ENCODING_ZIPLIST) {
+        unsigned char *p = ziplistIndex(o->ptr,start);
+        unsigned char *vstr;
+        unsigned int vlen;
+        long long vlong;
+
+        while(rangelen--) {
+            ziplistGet(p,&vstr,&vlen,&vlong);
+            if (vstr) {
+                addReplyBulkCBuffer(c,vstr,vlen);
+            } else {
+                addReplyBulkLongLong(c,vlong);
+            }
+            p = ziplistNext(o->ptr,p);
+        }
+    } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) {
+        listNode *ln = listIndex(o->ptr,start);
+
+        while(rangelen--) {
+            addReplyBulk(c,ln->value);
+            ln = ln->next;
+        }
+    } else {
+        redisPanic("List encoding is not LINKEDLIST nor ZIPLIST!");
     }
-    listTypeReleaseIterator(li);
 }
 
 void ltrimCommand(redisClient *c) {
@@ -705,7 +721,7 @@ void blockForKeys(redisClient *c, robj **keys, int numkeys, time_t timeout, robj
     c->bpop.target = target;
 
     if (target != NULL) {
-      incrRefCount(target);
+        incrRefCount(target);
     }
 
     for (j = 0; j < numkeys; j++) {
@@ -759,12 +775,7 @@ void unblockClientWaitingData(redisClient *c) {
     c->bpop.target = NULL;
     c->flags &= (~REDIS_BLOCKED);
     server.bpop_blocked_clients--;
-    /* We want to process data if there is some command waiting
-     * in the input buffer. Note that this is safe even if
-     * unblockClientWaitingData() gets called from freeClient() because
-     * freeClient() will be smart enough to call this function
-     * *after* c->querybuf was set to NULL. */
-    if (c->querybuf && sdslen(c->querybuf) > 0) processInputBuffer(c);
+    listAddNodeTail(server.unblocked_clients,c);
 }
 
 /* This should be called from any function PUSHing into lists.
@@ -780,35 +791,53 @@ void unblockClientWaitingData(redisClient *c) {
 int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
     struct dictEntry *de;
     redisClient *receiver;
-    list *l;
+    int numclients;
+    list *clients;
     listNode *ln;
+    robj *dstkey, *dstobj;
 
     de = dictFind(c->db->blocking_keys,key);
     if (de == NULL) return 0;
-    l = dictGetEntryVal(de);
-    ln = listFirst(l);
-    redisAssert(ln != NULL);
-    receiver = ln->value;
-
-    robj *target = receiver->bpop.target;
-
-    unblockClientWaitingData(receiver);
-
-    if (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,target);
-        if (dobj && checkType(receiver,dobj,REDIS_LIST)) return 0;
-        rpoplpushHandlePush(receiver,target,dobj,ele);
-        decrRefCount(target);
+    clients = dictGetEntryVal(de);
+    numclients = listLength(clients);
+
+    /* Try to handle the push as long as there are clients waiting for a push.
+     * Note that "numclients" is used because the list of clients waiting for a
+     * push on "key" is deleted by unblockClient() when empty.
+     *
+     * This loop will have more than 1 iteration when there is a BRPOPLPUSH
+     * that cannot push the target list because it does not contain a list. If
+     * this happens, it simply tries the next client waiting for a push. */
+    while (numclients--) {
+        ln = listFirst(clients);
+        redisAssert(ln != NULL);
+        receiver = ln->value;
+        dstkey = receiver->bpop.target;
+
+        /* 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;
+        } else {
+            /* BRPOPLPUSH */
+            dstobj = lookupKeyWrite(receiver->db,dstkey);
+            if (dstobj && checkType(receiver,dstobj,REDIS_LIST)) {
+                decrRefCount(dstkey);
+            } else {
+                rpoplpushHandlePush(receiver,dstkey,dstobj,ele);
+                decrRefCount(dstkey);
+                return 1;
+            }
+        }
     }
 
-    return 1;
+    return 0;
 }
 
 int getTimeoutFromObjectOrReply(redisClient *c, robj *object, time_t *timeout) {