371 lines
10 KiB
TypeScript
371 lines
10 KiB
TypeScript
import { field, Logger, logger } from "@coder/logger"
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import * as cp from "child_process"
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import * as path from "path"
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import * as rfs from "rotating-file-stream"
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import { Emitter } from "../common/emitter"
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import { DefaultedArgs } from "./cli"
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import { paths } from "./util"
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const timeoutInterval = 10000 // 10s, matches VS Code's timeouts.
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/**
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* Listen to a single message from a process. Reject if the process errors,
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* exits, or times out.
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*
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* `fn` is a function that determines whether the message is the one we're
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* waiting for.
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*/
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export function onMessage<M, T extends M>(
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proc: cp.ChildProcess | NodeJS.Process,
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fn: (message: M) => message is T,
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customLogger?: Logger,
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): Promise<T> {
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return new Promise((resolve, reject) => {
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const cleanup = () => {
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proc.off("error", onError)
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proc.off("exit", onExit)
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proc.off("message", onMessage)
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clearTimeout(timeout)
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}
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const timeout = setTimeout(() => {
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cleanup()
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reject(new Error("timed out"))
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}, timeoutInterval)
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const onError = (error: Error) => {
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cleanup()
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reject(error)
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}
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const onExit = (code: number) => {
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cleanup()
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reject(new Error(`exited unexpectedly with code ${code}`))
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}
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const onMessage = (message: M) => {
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;(customLogger || logger).trace("got message", field("message", message))
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if (fn(message)) {
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cleanup()
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resolve(message)
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}
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}
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proc.on("message", onMessage)
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// NodeJS.Process doesn't have `error` but binding anyway shouldn't break
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// anything. It does have `exit` but the types aren't working.
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;(proc as cp.ChildProcess).on("error", onError)
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;(proc as cp.ChildProcess).on("exit", onExit)
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})
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}
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interface ParentHandshakeMessage {
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type: "handshake"
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args: DefaultedArgs
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}
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interface ChildHandshakeMessage {
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type: "handshake"
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}
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interface RelaunchMessage {
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type: "relaunch"
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version: string
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}
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type ChildMessage = RelaunchMessage | ChildHandshakeMessage
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type ParentMessage = ParentHandshakeMessage
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class ProcessError extends Error {
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public constructor(message: string, public readonly code: number | undefined) {
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super(message)
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this.name = this.constructor.name
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Error.captureStackTrace(this, this.constructor)
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}
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}
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/**
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* Wrapper around a process that tries to gracefully exit when a process exits
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* and provides a way to prevent `process.exit`.
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*/
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abstract class Process {
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/**
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* Emit this to trigger a graceful exit.
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*/
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protected readonly _onDispose = new Emitter<NodeJS.Signals | undefined>()
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/**
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* Emitted when the process is about to be disposed.
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*/
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public readonly onDispose = this._onDispose.event
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/**
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* Uniquely named logger for the process.
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*/
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public abstract logger: Logger
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public constructor() {
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process.on("SIGINT", () => this._onDispose.emit("SIGINT"))
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process.on("SIGTERM", () => this._onDispose.emit("SIGTERM"))
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process.on("exit", () => this._onDispose.emit(undefined))
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this.onDispose((signal, wait) => {
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// Remove listeners to avoid possibly triggering disposal again.
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process.removeAllListeners()
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// Try waiting for other handlers to run first then exit.
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this.logger.debug("disposing", field("code", signal))
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wait.then(() => this.exit(0))
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setTimeout(() => this.exit(0), 5000)
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})
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}
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/**
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* Ensure control over when the process exits.
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*/
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public preventExit(): void {
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;(process.exit as any) = (code?: number) => {
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this.logger.warn(`process.exit() was prevented: ${code || "unknown code"}.`)
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}
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}
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private readonly processExit: (code?: number) => never = process.exit
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/**
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* Will always exit even if normal exit is being prevented.
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*/
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public exit(error?: number | ProcessError): never {
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if (error && typeof error !== "number") {
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this.processExit(typeof error.code === "number" ? error.code : 1)
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} else {
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this.processExit(error)
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}
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}
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}
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/**
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* Child process that will clean up after itself if the parent goes away and can
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* perform a handshake with the parent and ask it to relaunch.
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*/
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class ChildProcess extends Process {
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public logger = logger.named(`child:${process.pid}`)
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public constructor(private readonly parentPid: number) {
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super()
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// Kill the inner process if the parent dies. This is for the case where the
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// parent process is forcefully terminated and cannot clean up.
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setInterval(() => {
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try {
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// process.kill throws an exception if the process doesn't exist.
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process.kill(this.parentPid, 0)
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} catch (_) {
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// Consider this an error since it should have been able to clean up
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// the child process unless it was forcefully killed.
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this.logger.error(`parent process ${parentPid} died`)
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this._onDispose.emit(undefined)
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}
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}, 5000)
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}
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/**
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* Initiate the handshake and wait for a response from the parent.
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*/
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public async handshake(): Promise<DefaultedArgs> {
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this.send({ type: "handshake" })
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const message = await onMessage<ParentMessage, ParentHandshakeMessage>(
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process,
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(message): message is ParentHandshakeMessage => {
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return message.type === "handshake"
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},
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this.logger,
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)
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return message.args
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}
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/**
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* Notify the parent process that it should relaunch the child.
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*/
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public relaunch(version: string): void {
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this.send({ type: "relaunch", version })
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}
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/**
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* Send a message to the parent.
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*/
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private send(message: ChildMessage): void {
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if (!process.send) {
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throw new Error("not spawned with IPC")
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}
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process.send(message)
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}
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}
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/**
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* Parent process wrapper that spawns the child process and performs a handshake
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* with it. Will relaunch the child if it receives a SIGUSR1 or is asked to by
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* the child. If the child otherwise exits the parent will also exit.
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*/
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export class ParentProcess extends Process {
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public logger = logger.named(`parent:${process.pid}`)
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private child?: cp.ChildProcess
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private started?: Promise<void>
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private readonly logStdoutStream: rfs.RotatingFileStream
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private readonly logStderrStream: rfs.RotatingFileStream
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protected readonly _onChildMessage = new Emitter<ChildMessage>()
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protected readonly onChildMessage = this._onChildMessage.event
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private args?: DefaultedArgs
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public constructor(private currentVersion: string) {
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super()
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process.on("SIGUSR1", async () => {
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this.logger.info("Received SIGUSR1; hotswapping")
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this.relaunch()
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})
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const opts = {
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size: "10M",
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maxFiles: 10,
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}
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this.logStdoutStream = rfs.createStream(path.join(paths.data, "coder-logs", "code-server-stdout.log"), opts)
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this.logStderrStream = rfs.createStream(path.join(paths.data, "coder-logs", "code-server-stderr.log"), opts)
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this.onDispose(() => this.disposeChild())
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this.onChildMessage((message) => {
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switch (message.type) {
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case "relaunch":
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this.logger.info(`Relaunching: ${this.currentVersion} -> ${message.version}`)
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this.currentVersion = message.version
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this.relaunch()
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break
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default:
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this.logger.error(`Unrecognized message ${message}`)
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break
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}
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})
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}
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private async disposeChild(): Promise<void> {
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this.started = undefined
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if (this.child) {
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const child = this.child
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child.removeAllListeners()
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child.kill()
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// Wait for the child to exit otherwise its output will be lost which can
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// be especially problematic if you're trying to debug why cleanup failed.
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await new Promise((r) => child!.on("exit", r))
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}
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}
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private async relaunch(): Promise<void> {
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this.disposeChild()
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try {
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this.started = this._start()
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await this.started
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} catch (error: any) {
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this.logger.error(error.message)
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this.exit(typeof error.code === "number" ? error.code : 1)
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}
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}
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public start(args: DefaultedArgs): Promise<void> {
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// Store for relaunches.
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this.args = args
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if (!this.started) {
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this.started = this._start()
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}
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return this.started
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}
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private async _start(): Promise<void> {
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const child = this.spawn()
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this.child = child
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// Log both to stdout and to the log directory.
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if (child.stdout) {
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child.stdout.pipe(this.logStdoutStream)
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child.stdout.pipe(process.stdout)
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}
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if (child.stderr) {
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child.stderr.pipe(this.logStderrStream)
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child.stderr.pipe(process.stderr)
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}
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this.logger.debug(`spawned inner process ${child.pid}`)
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await this.handshake(child)
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child.once("exit", (code) => {
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this.logger.debug(`inner process ${child.pid} exited unexpectedly`)
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this.exit(code || 0)
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})
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}
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private spawn(): cp.ChildProcess {
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// Use spawn (instead of fork) to use the new binary in case it was updated.
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return cp.spawn(process.argv[0], process.argv.slice(1), {
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env: {
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...process.env,
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CODE_SERVER_PARENT_PID: process.pid.toString(),
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NODE_OPTIONS: `--max-old-space-size=2048 ${process.env.NODE_OPTIONS || ""}`,
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},
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stdio: ["inherit", "inherit", "inherit", "ipc"],
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})
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}
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/**
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* Wait for a handshake from the child then reply.
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*/
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private async handshake(child: cp.ChildProcess): Promise<void> {
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if (!this.args) {
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throw new Error("started without args")
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}
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await onMessage<ChildMessage, ChildHandshakeMessage>(
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child,
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(message): message is ChildHandshakeMessage => {
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return message.type === "handshake"
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},
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this.logger,
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)
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this.send(child, { type: "handshake", args: this.args })
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}
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/**
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* Send a message to the child.
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*/
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private send(child: cp.ChildProcess, message: ParentMessage): void {
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child.send(message)
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}
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}
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/**
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* Process wrapper.
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*/
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export const wrapper =
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typeof process.env.CODE_SERVER_PARENT_PID !== "undefined"
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? new ChildProcess(parseInt(process.env.CODE_SERVER_PARENT_PID))
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: new ParentProcess(require("../../package.json").version)
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export function isChild(proc: ChildProcess | ParentProcess): proc is ChildProcess {
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return proc instanceof ChildProcess
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}
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// It's possible that the pipe has closed (for example if you run code-server
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// --version | head -1). Assume that means we're done.
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if (!process.stdout.isTTY) {
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process.stdout.on("error", () => wrapper.exit())
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}
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// Don't let uncaught exceptions crash the process.
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process.on("uncaughtException", (error) => {
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wrapper.logger.error(`Uncaught exception: ${error.message}`)
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if (typeof error.stack !== "undefined") {
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wrapper.logger.error(error.stack)
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}
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})
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