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const fs = require('fs')
const path = require('path')
const pidusage = require('pidusage')
class PM2Monitoring {
constructor() {
this.pm2_monitoring = { cpu: 0, mem: 0 }
this.pm2_agent_monitoring = { cpu: 0, mem: 0 }
}
startCollection() {
setInterval(() => {
this.monitorPM2Agent()
this.monitorPM2()
}, 900)
}
getDefaultPM2Home() {
var PM2_ROOT_PATH;
if (process.env.PM2_HOME)
PM2_ROOT_PATH = process.env.PM2_HOME;
else if (process.env.HOME && !process.env.HOMEPATH)
PM2_ROOT_PATH = path.resolve(process.env.HOME, '.pm2');
else if (process.env.HOME || process.env.HOMEPATH)
PM2_ROOT_PATH = path.resolve(process.env.HOMEDRIVE, process.env.HOME || process.env.HOMEPATH, '.pm2');
else {
console.error('[PM2][Initialization] Environment variable HOME (Linux) or HOMEPATH (Windows) are not set!');
console.error('[PM2][Initialization] Defaulting to /etc/.pm2');
PM2_ROOT_PATH = path.resolve('/etc', '.pm2');
}
return PM2_ROOT_PATH;
}
report() {
return {
pm2: this.pm2_monitoring,
agent: this.pm2_agent_monitoring
}
}
monitorPM2() {
let pm2_pid_file = path.join(this.getDefaultPM2Home(), 'pm2.pid')
fs.readFile(pm2_pid_file, (err, pm2_pid) => {
if (err) return console.error(`Could not read ${pm2_pid_file}`)
if (!pm2_pid) return console.error(`PID is null`)
pm2_pid = parseInt(pm2_pid)
pidusage(pm2_pid, (err, stats) => {
if (err) return console.error(err)
this.pm2_monitoring = {
cpu: stats.cpu.toFixed(1),
mem: (stats.memory / 1024 / 1024).toFixed(1)
}
})
})
}
monitorPM2Agent() {
let pm2_agent_pid_file = path.join(this.getDefaultPM2Home(), 'agent.pid')
fs.readFile(pm2_agent_pid_file, (err, pm2_agent_pid) => {
if (err) return
if (!pm2_agent_pid) return
pidusage(pm2_agent_pid, (err, stats) => {
if (err) return
this.pm2_agent_monitoring = {
cpu: stats.cpu.toFixed(1),
mem: (stats.memory / 1024 / 1024).toFixed(1)
}
})
})
}
}
module.exports = PM2Monitoring