Merge pull request #181 from redsquirrel/unstable

[redis.git] / src / t_list.c

diff --git a/src/t_list.c b/src/t_list.c
index 7c1b848a814b3a9cc08ceb61e615d3eb5e167744..21fd1c2f5f333bc0fc9f0f6aa6efb57aa45001c0 100644 (file)
--- a/src/t_list.c
+++ b/src/t_list.c
@@ -198,7 +198,7 @@ void listTypeInsert(listTypeEntry *entry, robj *value, int where) {
 int listTypeEqual(listTypeEntry *entry, robj *o) {
     listTypeIterator *li = entry->li;
     if (li->encoding == REDIS_ENCODING_ZIPLIST) {
 int listTypeEqual(listTypeEntry *entry, robj *o) {
     listTypeIterator *li = entry->li;
     if (li->encoding == REDIS_ENCODING_ZIPLIST) {

-        redisAssert(o->encoding == REDIS_ENCODING_RAW);
+        redisAssertWithInfo(NULL,o,o->encoding == REDIS_ENCODING_RAW);

         return ziplistCompare(entry->zi,o->ptr,sdslen(o->ptr));
     } else if (li->encoding == REDIS_ENCODING_LINKEDLIST) {
         return equalStringObjects(o,listNodeValue(entry->ln));
         return ziplistCompare(entry->zi,o->ptr,sdslen(o->ptr));
     } else if (li->encoding == REDIS_ENCODING_LINKEDLIST) {
         return equalStringObjects(o,listNodeValue(entry->ln));


@@ -235,7 +235,7 @@ void listTypeDelete(listTypeEntry *entry) {
 void listTypeConvert(robj *subject, int enc) {
     listTypeIterator *li;
     listTypeEntry entry;
 void listTypeConvert(robj *subject, int enc) {
     listTypeIterator *li;
     listTypeEntry entry;

-    redisAssert(subject->type == REDIS_LIST);
+    redisAssertWithInfo(NULL,subject,subject->type == REDIS_LIST);

 
     if (enc == REDIS_ENCODING_LINKEDLIST) {
         list *l = listCreate();
 
     if (enc == REDIS_ENCODING_LINKEDLIST) {
         list *l = listCreate();


@@ -310,7 +310,7 @@ void pushxGenericCommand(redisClient *c, robj *refval, robj *val, int where) {
     if (refval != NULL) {
         /* Note: we expect refval to be string-encoded because it is *not* the
          * last argument of the multi-bulk LINSERT. */
     if (refval != NULL) {
         /* Note: we expect refval to be string-encoded because it is *not* the
          * last argument of the multi-bulk LINSERT. */

-        redisAssert(refval->encoding == REDIS_ENCODING_RAW);
+        redisAssertWithInfo(c,refval,refval->encoding == REDIS_ENCODING_RAW);

 
         /* We're not sure if this value can be inserted yet, but we cannot
          * convert the list inside the iterator. We don't want to loop over
 
         /* We're not sure if this value can be inserted yet, but we cannot
          * convert the list inside the iterator. We don't want to loop over


@@ -519,7 +519,12 @@ void lrangeCommand(redisClient *c) {
             p = ziplistNext(o->ptr,p);
         }
     } else if (o->encoding == REDIS_ENCODING_LINKEDLIST) {
             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);
 
         while(rangelen--) {
             addReplyBulk(c,ln->value);


@@ -640,17 +645,37 @@ void lremCommand(redisClient *c) {
  * as well. This command was originally proposed by Ezra Zygmuntowicz.
  */
 
  * 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 {
             signalModifiedKey(c->db,dstkey);
         /* Create the list if the key does not exist */
         if (!dstobj) {
             dstobj = createZiplistObject();
             dbAdd(c->db,dstkey,dstobj);
         } else {
             signalModifiedKey(c->db,dstkey);

-            server.dirty++;

         }
         listTypePush(dstobj,value,REDIS_HEAD);
         }
         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. */
     }
 
     /* Always send the pushed value to the client. */


@@ -666,16 +691,22 @@ void rpoplpushCommand(redisClient *c) {
         addReply(c,shared.nullbulk);
     } else {
         robj *dobj = lookupKeyWrite(c->db,c->argv[2]);
         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);
         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 */
 
         /* 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]);
-        signalModifiedKey(c->db,c->argv[1]);
+        if (listTypeLength(sobj) == 0) dbDelete(c->db,touchedkey);
+        signalModifiedKey(c->db,touchedkey);
+        decrRefCount(touchedkey);

         server.dirty++;
     }
 }
         server.dirty++;
     }
 }


@@ -743,9 +774,9 @@ void blockForKeys(redisClient *c, robj **keys, int numkeys, time_t timeout, robj
             l = listCreate();
             retval = dictAdd(c->db->blocking_keys,keys[j],l);
             incrRefCount(keys[j]);
             l = listCreate();
             retval = dictAdd(c->db->blocking_keys,keys[j],l);
             incrRefCount(keys[j]);

-            redisAssert(retval == DICT_OK);
+            redisAssertWithInfo(c,keys[j],retval == DICT_OK);

         } else {
         } else {

-            l = dictGetEntryVal(de);
+            l = dictGetVal(de);

         }
         listAddNodeTail(l,c);
     }
         }
         listAddNodeTail(l,c);
     }


@@ -760,13 +791,13 @@ void unblockClientWaitingData(redisClient *c) {
     list *l;
     int j;
 
     list *l;
     int j;
 

-    redisAssert(c->bpop.keys != NULL);
+    redisAssertWithInfo(c,NULL,c->bpop.keys != NULL);

     /* The client may wait for multiple keys, so unblock it for every key. */
     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->bpop.keys[j]);
     /* The client may wait for multiple keys, so unblock it for every key. */
     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->bpop.keys[j]);

-        redisAssert(de != NULL);
-        l = dictGetEntryVal(de);
+        redisAssertWithInfo(c,c->bpop.keys[j],de != NULL);
+        l = dictGetVal(de);

         listDelNode(l,listSearchKey(l,c));
         /* If the list is empty we need to remove it to avoid wasting memory */
         if (listLength(l) == 0)
         listDelNode(l,listSearchKey(l,c));
         /* If the list is empty we need to remove it to avoid wasting memory */
         if (listLength(l) == 0)


@@ -777,6 +808,7 @@ void unblockClientWaitingData(redisClient *c) {
     /* Cleanup the client structure */
     zfree(c->bpop.keys);
     c->bpop.keys = NULL;
     /* 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_UNBLOCKED;
     c->bpop.target = NULL;
     c->flags &= ~REDIS_BLOCKED;
     c->flags |= REDIS_UNBLOCKED;


@@ -804,7 +836,7 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
 
     de = dictFind(c->db->blocking_keys,key);
     if (de == NULL) return 0;
 
     de = dictFind(c->db->blocking_keys,key);
     if (de == NULL) return 0;

-    clients = dictGetEntryVal(de);
+    clients = dictGetVal(de);

     numclients = listLength(clients);
 
     /* Try to handle the push as long as there are clients waiting for a push.
     numclients = listLength(clients);
 
     /* Try to handle the push as long as there are clients waiting for a push.


@@ -816,10 +848,14 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
      * this happens, it simply tries the next client waiting for a push. */
     while (numclients--) {
         ln = listFirst(clients);
      * this happens, it simply tries the next client waiting for a push. */
     while (numclients--) {
         ln = listFirst(clients);

-        redisAssert(ln != NULL);
+        redisAssertWithInfo(c,key,ln != NULL);

         receiver = ln->value;
         dstkey = receiver->bpop.target;
 
         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);
 
         /* This should remove the first element of the "clients" list. */
         unblockClientWaitingData(receiver);
 


@@ -828,17 +864,16 @@ int handleClientsWaitingListPush(redisClient *c, robj *key, robj *ele) {
             addReplyMultiBulkLen(receiver,2);
             addReplyBulk(receiver,key);
             addReplyBulk(receiver,ele);
             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, note that receiver->db is always equal to c->db. */
             dstobj = lookupKeyWrite(receiver->db,dstkey);
         } else {
             /* 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);
                 return 1;
             }

+            decrRefCount(dstkey);

         }
     }
 
         }
     }
 


@@ -882,6 +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 */
                 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;
 
                     robj *argv[2], **orig_argv;
                     int orig_argc;
 


@@ -889,6 +925,7 @@ void blockingPopGenericCommand(redisClient *c, int where) {
                      * popGenericCommand() as the command takes a single key. */
                     orig_argv = c->argv;
                     orig_argc = c->argc;
                      * 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;
                     argv[1] = c->argv[j];
                     c->argv = argv;
                     c->argc = 2;


@@ -906,6 +943,7 @@ void blockingPopGenericCommand(redisClient *c, int where) {
                     /* Fix the client structure with the original stuff */
                     c->argv = orig_argv;
                     c->argc = orig_argc;
                     /* Fix the client structure with the original stuff */
                     c->argv = orig_argv;
                     c->argc = orig_argc;

+                    c->cmd = orig_cmd;

 
                     return;
                 }
 
                     return;
                 }


@@ -957,7 +995,7 @@ void brpoplpushCommand(redisClient *c) {
 
             /* The list exists and has elements, so
              * the regular rpoplpushCommand is executed. */
 
             /* The list exists and has elements, so
              * the regular rpoplpushCommand is executed. */

-            redisAssert(listTypeLength(key) > 0);
+            redisAssertWithInfo(c,key,listTypeLength(key) > 0);

             rpoplpushCommand(c);
         }
     }
             rpoplpushCommand(c);
         }
     }