Cluster: CLUSTER SLAVES subcommand added.

src/cluster.c

@@ -2939,6 +2939,28 @@ void clusterCommand(redisClient *c) {
         clusterSetMaster(n);
         clusterDoBeforeSleep(CLUSTER_TODO_UPDATE_STATE|CLUSTER_TODO_SAVE_CONFIG);
         addReply(c,shared.ok);
+    } else if (!strcasecmp(c->argv[1]->ptr,"slaves") && c->argc == 3) {
+        /* CLUSTER SLAVES <NODE ID> */
+        clusterNode *n = clusterLookupNode(c->argv[2]->ptr);
+        int j;
+
+        /* Lookup the specified node in our table. */
+        if (!n) {
+            addReplyErrorFormat(c,"Unknown node %s", (char*)c->argv[2]->ptr);
+            return;
+        }
+
+        if (n->flags & REDIS_NODE_SLAVE) {
+            addReplyError(c,"The specified node is not a master");
+            return;
+        }
+
+        addReplyMultiBulkLen(c,n->numslaves);
+        for (j = 0; j < n->numslaves; j++) {
+            sds ni = clusterGenNodeDescription(n->slaves[j]);
+            addReplyBulkCString(c,ni);
+            sdsfree(ni);
+        }
     } else {
         addReplyError(c,"Wrong CLUSTER subcommand or number of arguments");
     }