Wrapper around node_redis creating a client pointing at the master server which autoupdates when the master goes down.
var sentinel = require('redis-sentinel');
// List the sentinel endpoints
var endpoints = [
{host: '127.0.0.1', port: 26379},
{host: '127.0.0.1', port: 26380}
];
var opts = {}; // Standard node_redis client options
var masterName = 'mymaster';
// masterName and opts are optional - masterName defaults to 'mymaster'
var redisClient = sentinel.createClient(endpoints, masterName, opts);
// redisClient is a normal redis client, except that if the master goes down
// it will keep checking the sentinels for a new master and then connect to that.
// No need to monitor for reconnects etc - everything handled transparently
// Anything that persists over the normal node_redis reconnect will persist here.
// Anything that doesn't, won't.
// An equivalent way of doing the above (if you don't want to have to pass the endpoints around all the time) is
var Sentinel = sentinel.Sentinel(endpoints);
var masterClient = Sentinel.createClient(masterName, opts);You can get a connection to a slave (chosen at random) or the first available sentinel from the endpoints by passing in the role attribute in the options. E.g.
// The master is the default case if no role is specified.
var masterClient = sentinel.createClient(endpoints, masterName, {role: 'master'});
var slaveClient = sentinel.createClient(endpoints, masterName, {role: 'slave'});
var sentinelClient = sentinel.createClient(endpoints, {role: 'sentinel'});Where you should also transparently get a reconnection to a new slave/sentinel if the existing one goes down.
- Support for if the master changes but doesn't go down
- We could probably be cleverer with reconnects etc. and there may be issues with the error handling
MIT