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watchdog.ts
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watchdog.ts
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// this spawns a child process that listens for SIGHUP when the
// parent process exits, and after 200ms, sends a SIGKILL to the
// child, in case it did not terminate.
import { ChildProcess, spawn } from 'child_process'
const watchdogCode = String.raw`
const pid = parseInt(process.argv[1], 10)
process.title = 'node (foreground-child watchdog pid=' + pid + ')'
if (!isNaN(pid)) {
let barked = false
// keepalive
const interval = setInterval(() => {}, 60000)
const bark = () => {
clearInterval(interval)
if (barked) return
barked = true
process.removeListener('SIGHUP', bark)
setTimeout(() => {
try {
process.kill(pid, 'SIGKILL')
setTimeout(() => process.exit(), 200)
} catch (_) {}
}, 500)
})
process.on('SIGHUP', bark)
}
`
export const watchdog = (child: ChildProcess) => {
let dogExited = false
const dog = spawn(
process.execPath,
['-e', watchdogCode, String(child.pid)],
{
stdio: 'ignore',
}
)
dog.on('exit', () => (dogExited = true))
child.on('exit', () => {
if (!dogExited) dog.kill('SIGTERM')
})
return dog
}