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@dahjelle
Created Jan 26, 2015
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Attempting cluster-based graceful restarts in Hapi
var Hapi = require('hapi');
var PORT = process.env.PORT || 3000;
var server = new Hapi.Server();
server.connection({
port: PORT
});
server.route({
method: 'GET',
path: '/{path*}',
handler: {
directory: {
path: './public',
listing: false,
index: true
}
}
});
// based off of http://stackoverflow.com/a/10997753/185651
var cluster = function(server) {
var cluster = require('cluster');
var numCPUs = require('os').cpus().length;
var workerList = new Array();
var sigkill = false;
if (cluster.isMaster) {
for (var i = 0; i < numCPUs; i++) {
var env = process.env;
var worker = cluster.fork(env);
workerList.push(worker);
}
process.on('SIGUSR2',function(){
console.log("Received SIGUSR2 from system");
console.log("There are " + workerList.length + " workers running");
workerList.forEach(function(worker){
console.log("Sending STOP message to worker PID=" + worker.pid);
worker.send({cmd: "stop"});
});
for (var i = 0; i < numCPUs; i++) {
var env = process.env;
var worker = cluster.fork(env);
workerList.push(worker);
}
});
process.on('SIGINT',function(){
sigint = true;
process.exit();
});
cluster.on('exit', function(worker) {
if (sigkill) {
logger.warn("SIGKINT received - not respawning workers");
return;
}
var newWorker = cluster.fork();
console.log('Worker ' + worker.pid + ' died and it will be re-spawned');
removeWorkerFromListByPID(worker.pid);
workerList.push(newWorker);
});
} else {
process.on('message', function(msg) {
if (msg.cmd && msg.cmd == 'stop') {
console.log("Received STOP signal from master");
server.stop({
timeout: 50000
}, function() {
console.log('hapi done');
process.exit();
});
}
});
server.start(function() {
console.log("server started");
});
}
function removeWorkerFromListByPID(pid) {
var counter = -1;
workerList.forEach(function(worker){
++counter;
if (worker.pid === pid) {
workerList.splice(counter, 1);
}
});
}
};
cluster( server );
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