walnut.js/boot/master.js

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'use strict';
// TODO if RAM is very low we should not fork at all,
// but use a different process altogether
console.info('pid:', process.pid);
console.info('title:', process.title);
console.info('arch:', process.arch);
console.info('platform:', process.platform);
console.info('\n\n\n[MASTER] Welcome to WALNUT!');
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function tryConf(pathname, def) {
try {
return require(pathname);
} catch(e) {
return def;
}
}
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var path = require('path');
var cluster = require('cluster');
//var minWorkers = 2;
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var numCores = 2; // Math.max(minWorkers, require('os').cpus().length);
var workers = [];
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var state = { firstRun: true };
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// TODO Should these be configurable? If so, where?
// TODO communicate config with environment vars?
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var walnut = tryConf(
path.join('..', '..', 'config.walnut')
, { externalPort: 443
, externalInsecurePort: 80
}
);
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var info = {
type: 'walnut.init'
, conf: {
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protocol: 'http'
, externalPort: walnut.externalPort || 443
, externalPortInsecure: walnut.externalInsecurePort || 80 // TODO externalInsecurePort
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, localPort: walnut.localPort || 3000 // system / local network
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, trustProxy: true
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, varpath: path.join(__dirname, '..', '..', 'var')
, etcpath: path.join(__dirname, '..', '..', 'etc')
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}
};
function fork() {
if (workers.length < numCores) {
workers.push(cluster.fork());
}
}
cluster.on('online', function (worker) {
console.info('[MASTER] Worker ' + worker.process.pid + ' is online');
fork();
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if (state.firstRun) {
state.firstRun = false;
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// TODO dyndns in master?
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}
function touchMaster(msg) {
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if ('walnut.webserver.listening' !== msg.type) {
console.warn('[MASTER] received unexpected message from worker');
console.warn(msg);
return;
}
state.workers = workers;
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// calls init if init has not been called
require('../lib/master').touch(info.conf, state).then(function (newConf) {
worker.send({ type: 'walnut.webserver.onrequest', conf: newConf });
newConf.addWorker(worker);
});
}
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worker.send(info);
worker.on('message', touchMaster);
});
cluster.on('exit', function (worker, code, signal) {
console.info('[MASTER] Worker ' + worker.process.pid + ' died with code: ' + code + ', and signal: ' + signal);
workers = workers.map(function (w) {
if (worker !== w) {
return w;
}
return null;
}).filter(function (w) {
return w;
});
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//console.log('WARNING: worker spawning turned off for debugging ');
fork();
});
fork();