feat: set default port of sentinels to 26379. (#441)

BREAKING CHANGE: The default port of sentinels are now 26379 instead of 6379. This shouldn't break your app in most case since few setups has the sentinel server running on 6379, but if it's your case and the port isn't set explicitly, please go to update it.

README.md

@@ -590,7 +590,7 @@ var redis = new Redis({
 
 ## Sentinel
 ioredis supports Sentinel out of the box. It works transparently as all features that work when
-you connect to a single node also work when you connect to a sentinel group. Make sure to run Redis >= 2.8.12 if you want to use this feature.
+you connect to a single node also work when you connect to a sentinel group. Make sure to run Redis >= 2.8.12 if you want to use this feature. Sentinels have a default port of 26379.
 
 To connect using Sentinel, use:
 

lib/connectors/sentinel_connector.js

@@ -210,7 +210,7 @@ SentinelConnector.prototype.resolve = function (endpoint, callback) {
     Redis = require('../redis');
   }
   var client = new Redis({
-    port: endpoint.port,
+    port: endpoint.port || 26379,
     host: endpoint.host,
     retryStrategy: null,
     enableReadyCheck: false,
@@ -232,7 +232,7 @@ function noop() {}
 
 function isSentinelEql(a, b) {
   return ((a.host || '127.0.0.1') === (b.host || '127.0.0.1')) &&
-    ((a.port || 6379) === (b.port || 6379));
+    ((a.port || 26379) === (b.port || 26379));
 }
 
 module.exports = SentinelConnector;

test/functional/sentinel.js

@@ -18,6 +18,22 @@ describe('sentinel', function () {
 
     });
 
+    it('should default to the default sentinel port', function (done) {
+      var sentinel = new MockServer(26379);
+      sentinel.once('connect', function () {
+        redis.disconnect();
+        sentinel.disconnect(done);
+      });
+
+      var redis = new Redis({
+        sentinels: [
+          { host: '127.0.0.1' }
+        ],
+        name: 'master'
+      });
+
+    });
+
     it('should try to connect to all sentinel', function (done) {
       var sentinel = new MockServer(27380);
       sentinel.once('connect', function () {