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supervisor.jsx
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supervisor.jsx
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//Lets require/import the HTTP module
const http = require('http');
const path = require('path');
const spawn = require('child_process').spawn;
const log = console.log;
const assert = console.assert;
const bodyParser = require('body-parser');
const express = require('express');
const app = express();
assert(process.argv.length > 3, "try to call for example 'node " + path.basename(__filename) + " 0.0.0.0 8080'");
const ip = process.argv[2];
// http://www.w3resource.com/javascript/form/ip-address-validation.php
assert(
/^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/.test(ip),
"first argument should have format of ip address eg: 127.168.10.105 and is '" + ip + "'"
);
const port = process.argv[3];
assert(port >= 0 && port <= 65535, "port beyond range 0 - 65535 : '" + port + "'");
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json()); // https://github.com/expressjs/body-parser#expressconnect-top-level-generic
app.all('/fetch', (req, res) => {
proc = spawn('node', ['fork.jsx', objToBase64(params)], {
maxBuffer: 200*1024,
timeout: params.timeout,
killSignal: 'SIGTERM',
shell: true
});
});
app.use(express.static('static'));
function response(res, data, code) {
res.statusCode = code || 200;
res.setHeader('Content-Type', 'application/json; charset=utf-8');
res.end(JSON.stringify(data));
}
app.all('/status', (req, res) => {
// ps aux | grep "node server.js" | grep -v grep
proc = spawn('bash', ['status.sh'], {
maxBuffer: 200*1024,
timeout: 5000,
killSignal: 'SIGTERM',
shell: true
});
var buff = '';
proc.stdout.on('data', (data) => {
buff += `${data}`;
});
proc.stderr.on('data', (data) => {
return response(res, {
errorType: 'child process stderr',
data: data.toString('utf-8')
}, 500);
});
proc.on('close', () => {
response(res, {
response: buff || 'serwer is not running'
}, (buff.indexOf('server.jsx') > -1) ? 200 : 404);
});
});
app.all('/start', (req, res) => {
// ps aux | grep "node server.js" | grep -v grep
proc = spawn('bash', ['start.sh', req.body.ip, req.body.port], {
maxBuffer: 200*1024,
timeout: 5000,
killSignal: 'SIGTERM',
shell: true
});
response(res, {
response: 'attempt to start'
});
});
app.all('/stop', (req, res) => {
// kill -SIGTERM $(ps aux | grep "server.jsx" | grep -v grep | head -1 | awk '{print $2}')
proc = spawn('bash', ['stop.sh'], {
maxBuffer: 200*1024,
timeout: 5000,
killSignal: 'SIGTERM',
shell: true
});
response(res, {
response: 'attempt to stop'
});
})
app.listen(port, ip, () => {
console.log('Server running '+ip+':'+port)
});