fix(cluster): fix not connecting to the unknown nodes

Author: luin

lib/cluster/connection_pool.js

@@ -23,6 +23,7 @@ ConnectionPool.prototype.findOrCreate = function (node, readOnly) {
   node.port = node.port || 6379;
   node.host = node.host || '127.0.0.1';
   node.key = node.key || node.host + ':' + node.port;
+  readOnly = Boolean(readOnly);
 
   if (this.specifiedOptions[node.key]) {
     _.assign(node, this.specifiedOptions[node.key]);

lib/cluster/index.js

@@ -71,10 +71,10 @@ function Cluster(startupNodes, options) {
 
   var _this = this;
   this.connectionPool.on('-node', function (redis) {
-    _this.emit('-node');
     if (_this.subscriber === redis) {
       _this.selectSubscriber();
     }
+    _this.emit('-node');
   });
   this.connectionPool.on('+node', function (redis) {
     _this.emit('+node', redis);
@@ -84,7 +84,6 @@ function Cluster(startupNodes, options) {
   });
 
   this.slots = [];
-
   this.retryAttempts = 0;
 
   this.resetOfflineQueue();
@@ -430,6 +429,8 @@ Cluster.prototype.sendCommand = function (command, stream, node) {
           } else {
             _this.slots[slot] = [key];
           }
+          var splitKey = key.split(':');
+          _this.connectionPool.findOrCreate({ host: splitKey[0], port: Number(splitKey[1]) });
           tryConnection();
           _this.refreshSlotsCache();
         },

test/functional/cluster.js

@@ -338,6 +338,36 @@ describe('cluster', function () {
       });
     });
 
+    it('should be able to redirect a command to a unknown node', function (done) {
+      var slotTable = [
+        [0, 16383, ['127.0.0.1', 30001]]
+      ];
+      var node1 = new MockServer(30001, function (argv) {
+        if (argv[0] === 'cluster' && argv[1] === 'slots') {
+          return slotTable;
+        }
+        if (argv[0] === 'get' && argv[1] === 'foo') {
+          return new Error('MOVED ' + utils.calcSlot('foo') + ' 127.0.0.1:30002');
+        }
+      });
+      var node2 = new MockServer(30002, function (argv) {
+        if (argv[0] === 'cluster' && argv[1] === 'slots') {
+          return slotTable;
+        }
+        if (argv[0] === 'get' && argv[1] === 'foo') {
+          return 'bar';
+        }
+      });
+      var cluster = new Redis.Cluster([
+        { host: '127.0.0.1', port: '30001' }
+      ], { lazyConnect: false });
+      cluster.get('foo', function (err, res) {
+        expect(res).to.eql('bar');
+        cluster.disconnect();
+        disconnect([node1, node2], done);
+      });
+    });
+
     it('should auto redirect the command within a pipeline', function (done) {
       var moved = false;
       var times = 0;