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load-balancer.js
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load-balancer.js
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const { spawn } = require('child_process');
const httpProxy = require('http-proxy');
const http = require("http");
const path = require("path");
let processes = [];
let destinations = [];
let instances = process.argv[3] || 8;
let proxy = httpProxy.createProxyServer();
const artisan = path.resolve(process.argv[2]);
const loadBalancer = {
init: () => {
loadBalancer.startInstances().then(() => {
console.log('instances started')
}).then(loadBalancer.startProxy).then(() => {
console.log('proxy started')
});
process.on('SIGINT', loadBalancer.killProcesses);
process.on('SIGTERM', loadBalancer.killProcesses);
},
startProxy: () => {
const server = http.createServer((req, res) => {
const target = destinations[Math.floor(Math.random() * destinations.length)];
console.log(`[${destinations.indexOf(target)}][${target}]: ` + req.url);
proxy.web(req, res, { target });
});
server.listen(5000, () => {
console.log('Load balancer listening on port 5000');
});
},
startInstances: async () => {
for (let i = 0; i < instances; i++) {
destinations.push('http://127.0.0.1:' + (3000+i));
const instance = spawn('php', [artisan, 'serve', `--port=${3000+i}`]);
processes.push(instance);
console.log(`Worker ${i} is listening on port ${3000+i}`);
}
return Promise.resolve();
},
killProcesses: () => {
console.log('Killing processes...');
processes.forEach(process => {
console.log('Killing process: ' + process.pid);
process.kill();
});
},
};
loadBalancer.init();