Tldraw/apps/dotcom-worker/scripts/dev-wrap.ts

74 wiersze
1.8 KiB
TypeScript
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// at the time of writing, workerd will regularly crash with a segfault
// but the error is not caught by the process, so it will just hang
// this script wraps the process, tailing the logs and restarting the process
// if we encounter the string 'Segmentation fault'
import { ChildProcessWithoutNullStreams, spawn } from 'child_process'
import stripAnsi from 'strip-ansi'
// eslint-disable-next-line no-console
const log = console.log
class MiniflareMonitor {
private process: ChildProcessWithoutNullStreams | null = null
constructor(
private command: string,
private args: string[] = []
) {}
public start(): void {
this.stop() // Ensure any existing process is stopped
log(`Starting wrangler...`)
this.process = spawn(this.command, this.args, {
env: {
NODE_ENV: 'development',
...process.env,
},
})
this.process.stdout.on('data', (data: Buffer) => {
this.handleOutput(stripAnsi(data.toString().replace('\r', '').trim()))
})
this.process.stderr.on('data', (data: Buffer) => {
this.handleOutput(stripAnsi(data.toString().replace('\r', '').trim()), true)
})
}
private handleOutput(output: string, err = false): void {
if (!output) return
if (output.includes('Segmentation fault')) {
console.error('Segmentation fault detected. Restarting Miniflare...')
this.restart()
} else if (!err) {
log(output.replace('[mf:inf]', '')) // or handle the output differently
}
}
private restart(): void {
log('Restarting wrangler...')
this.stop()
setTimeout(() => this.start(), 3000) // Restart after a short delay
}
private stop(): void {
if (this.process) {
this.process.kill()
this.process = null
}
}
}
const monitor = new MiniflareMonitor('wrangler', [
'dev',
'--env',
'dev',
'--test-scheduled',
'--log-level',
'info',
'--var',
'IS_LOCAL:true',
])
monitor.start()