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https://github.com/vodolaz095/nodejs-express-cluster
Example of usage of native Nodejs cluster with express application
https://github.com/vodolaz095/nodejs-express-cluster
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Example of usage of native Nodejs cluster with express application
- Host: GitHub
- URL: https://github.com/vodolaz095/nodejs-express-cluster
- Owner: vodolaz095
- License: mit
- Created: 2015-11-18T08:03:56.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2015-11-18T09:07:30.000Z (almost 9 years ago)
- Last Synced: 2024-04-09T23:07:25.173Z (7 months ago)
- Language: JavaScript
- Size: 2.93 KB
- Stars: 0
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# nodejs-express-cluster
Example of usage of native Nodejs cluster with express application
# Code of Example
```javascript
'use strict';
//simple express application
var express = require('express'),
app = express();
app.get('/', function (req, res) {
res.send('Hello World!');
});
app.get('/boom', function (req, res) {
res.send('As you wish...');
process.exit(1);
});
//simple net echo server
var net = require('net'),
server = net.createServer(function (socket) {
socket.write('Echo server\r\n');
socket.pipe(socket);
});
//clustered background process
function doThings(payload) {
this.payload = payload;
}
doThings.prototype.listen = function (port,callback) {
//port is ignored(
var payload = this.payload;
setInterval(function () {
console.log('Worker: I am background service with PID#%d doing this:%s', process.pid, payload);
}, 1000);
setTimeout(function () {
console.log('Worker: I am background service with PID#%d doing this:%s. I want to sleep!', process.pid, payload);
process.exit(1);
}, 5000);
process.nextTick(callback);
};
var
bg1 = new doThings('route1'),
bg2 = new doThings('route2');
//making function to start cluster
var
cluster = require('cluster'),
os = require('os'),
assert = require('assert');
function startAsCluster(server, port, numberOfWorkers) {
assert(typeof server.listen === 'function', 'first argument need to have method `listen`!');
if (cluster.isMaster) {
var
numCPUs = Math.min(os.cpus().length, numberOfWorkers);
for (var i = 0; i < numCPUs; i++) {
cluster.fork();
}
cluster.on('online', function (worker) {
console.log('Cluster : Worker of %s PID#%d is online!', server.constructor.name, process.pid, worker.process.pid);
});
cluster.on('exit', function (worker) {
console.log('Cluster : Worker #%d died (%d)! Trying to spawn spare one...', worker.process.pid, worker.process.exitCode);
cluster.fork();
});
} else {
server.listen(port, function () {
switch (server.constructor.name) {
case 'EventEmitter':
console.log('Worker: I am ExpressJS PID#%d listening on port %d', process.pid, port);
break;
case 'server':
console.log('Worker: I am net server PID#%d listening on port %d', process.pid, port);
break;
default:
console.log('Worker: I am %s PID#%d listening on port %d', server.constructor.name, process.pid, port);
}
});
}
}
startAsCluster(app, 3000, 1); //for express application
startAsCluster(server, 3001, 1); //for telnet server
startAsCluster(bg1, 3001, 1); //for background process, port is ignored
startAsCluster(bg2, 3001, 1); //for background process, port is ignored
```
# Usage
```shell
# npm install
# npm start
```