feat(sentinel): update sentinels after getting master

Author: ddunkin

lib/connectors/sentinel_connector.js

@@ -35,14 +35,17 @@ SentinelConnector.prototype.connect = function (callback) {
   if (typeof this.currentPoint !== 'number') {
     this.currentPoint = -1;
   }
+  if (!Array.isArray(this.sentinels)) {
+    this.sentinels = this.options.sentinels;
+  }
 
   var _this = this;
   var lastError;
   connectToNext();
 
   function connectToNext() {
     _this.currentPoint += 1;
-    if (_this.currentPoint === _this.options.sentinels.length) {
+    if (_this.currentPoint === _this.sentinels.length) {
       _this.currentPoint = -1;
 
       var retryDelay;
@@ -62,7 +65,7 @@ SentinelConnector.prototype.connect = function (callback) {
       return;
     }
 
-    var endpoint = _this.options.sentinels[_this.currentPoint];
+    var endpoint = _this.sentinels[_this.currentPoint];
     _this.resolve(endpoint, function (err, resolved) {
       if (!_this.connecting) {
         callback(new Error('Connection is closed.'));
@@ -84,13 +87,48 @@ SentinelConnector.prototype.connect = function (callback) {
   }
 };
 
+SentinelConnector.prototype.updateSentinels = function (client, callback) {
+  var _this = this;
+  client.sentinel('sentinels', this.options.name, function (err, result) {
+    if (err) {
+      client.disconnect();
+      return callback(err);
+    }
+    if (Array.isArray(result)) {
+      for (var i = 0; i < result.length; ++i) {
+        var sentinel = utils.packObject(result[i]);
+        var flags = sentinel.flags ? sentinel.flags.split(',') : [];
+        if (flags.indexOf('disconnected') === -1 && sentinel.ip && sentinel.port) {
+          var endpoint = { host: sentinel.ip, port: parseInt(sentinel.port) };
+          var isDuplicate = _this.sentinels.some(function (o) {
+            return o.host === endpoint.host && o.port === endpoint.port;
+          });
+          if (!isDuplicate) {
+            debug('adding sentinel %s:%s', endpoint.host, endpoint.port);
+            _this.sentinels.push(endpoint);
+          }
+        }
+      }
+      debug('sentinels', _this.sentinels);
+    }
+    callback(null);
+  });
+};
+
 SentinelConnector.prototype.resolveMaster = function (client, callback) {
+  var _this = this;
   client.sentinel('get-master-addr-by-name', this.options.name, function (err, result) {
-    client.disconnect();
     if (err) {
+      client.disconnect();
       return callback(err);
     }
-    callback(null, Array.isArray(result) ? { host: result[0], port: result[1] } : null);
+    _this.updateSentinels(client, function (err) {
+      client.disconnect();
+      if (err) {
+        return callback(err);
+      }
+      callback(null, Array.isArray(result) ? { host: result[0], port: result[1] } : null);
+    });
   });
 };