274 lines
8.3 KiB
TypeScript
274 lines
8.3 KiB
TypeScript
import { field, 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 { paths } from "./util"
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interface HandshakeMessage {
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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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export type Message = RelaunchMessage | HandshakeMessage
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export 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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* Allows the wrapper and inner processes to communicate.
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*/
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export class IpcMain {
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private readonly _onMessage = new Emitter<Message>()
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public readonly onMessage = this._onMessage.event
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private readonly _onDispose = new Emitter<NodeJS.Signals | undefined>()
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public readonly onDispose = this._onDispose.event
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public readonly processExit: (code?: number) => never
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public constructor(public readonly parentPid?: number) {
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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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// Ensure we control when the process exits.
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this.processExit = process.exit
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process.exit = function (code?: number) {
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logger.warn(`process.exit() was prevented: ${code || "unknown code"}.`)
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} as (code?: number) => never
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this.onDispose((signal) => {
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// Remove listeners to avoid possibly triggering disposal again.
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process.removeAllListeners()
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// Let any other handlers run first then exit.
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logger.debug(`${parentPid ? "inner process" : "wrapper"} ${process.pid} disposing`, field("code", signal))
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setTimeout(() => this.exit(0), 0)
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})
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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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if (parentPid) {
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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(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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logger.error(`parent process ${parentPid} died`)
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this._onDispose.emit(undefined)
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}
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}, 5000)
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}
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}
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public exit(error?: number | ProcessError): never {
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if (error && typeof error !== "number") {
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this.processExit(typeof error.code === "number" ? error.code : 1)
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} else {
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this.processExit(error)
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}
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}
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public handshake(child?: cp.ChildProcess): Promise<void> {
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return new Promise((resolve, reject) => {
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const target = child || process
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const onMessage = (message: Message): void => {
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logger.debug(
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`${child ? "wrapper" : "inner process"} ${process.pid} received message from ${
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child ? child.pid : this.parentPid
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}`,
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field("message", message),
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)
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if (message.type === "handshake") {
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target.removeListener("message", onMessage)
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target.on("message", (msg) => this._onMessage.emit(msg))
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// The wrapper responds once the inner process starts the handshake.
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if (child) {
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if (!target.send) {
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throw new Error("child not spawned with IPC")
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}
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target.send({ type: "handshake" })
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}
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resolve()
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}
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}
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target.on("message", onMessage)
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if (child) {
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child.once("error", reject)
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child.once("exit", (code) => {
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reject(new ProcessError(`Unexpected exit with code ${code}`, code !== null ? code : undefined))
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})
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} else {
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// The inner process initiates the handshake.
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this.send({ type: "handshake" })
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}
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})
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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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private send(message: Message): 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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let _ipcMain: IpcMain
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export const ipcMain = (): IpcMain => {
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if (!_ipcMain) {
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_ipcMain = new IpcMain(
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typeof process.env.CODE_SERVER_PARENT_PID !== "undefined"
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? parseInt(process.env.CODE_SERVER_PARENT_PID)
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: undefined,
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)
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}
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return _ipcMain
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}
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export interface WrapperOptions {
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maxMemory?: number
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nodeOptions?: string
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}
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/**
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* Provides a way to wrap a process for the purpose of updating the running
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* instance.
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*/
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export class WrapperProcess {
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private process?: 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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public constructor(private currentVersion: string, private readonly options?: WrapperOptions) {
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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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ipcMain().onDispose(() => {
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if (this.process) {
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this.process.removeAllListeners()
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this.process.kill()
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}
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})
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ipcMain().onMessage((message) => {
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switch (message.type) {
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case "relaunch":
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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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logger.error(`Unrecognized message ${message}`)
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break
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}
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})
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process.on("SIGUSR1", async () => {
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logger.info("Received SIGUSR1; hotswapping")
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this.relaunch()
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})
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}
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private async relaunch(): Promise<void> {
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this.started = undefined
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if (this.process) {
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this.process.removeAllListeners()
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this.process.kill()
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}
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try {
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await this.start()
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} catch (error) {
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logger.error(error.message)
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ipcMain().exit(typeof error.code === "number" ? error.code : 1)
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}
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}
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public start(): Promise<void> {
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if (!this.started) {
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this.started = this.spawn().then((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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logger.debug(`spawned inner process ${child.pid}`)
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ipcMain()
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.handshake(child)
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.then(() => {
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child.once("exit", (code) => {
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logger.debug(`inner process ${child.pid} exited unexpectedly`)
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ipcMain().exit(code || 0)
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})
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})
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this.process = child
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})
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}
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return this.started
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}
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private async spawn(): Promise<cp.ChildProcess> {
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// Flags to pass along to the Node binary.
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let nodeOptions = `${process.env.NODE_OPTIONS || ""} ${(this.options && this.options.nodeOptions) || ""}`
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if (!/max_old_space_size=(\d+)/g.exec(nodeOptions)) {
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nodeOptions += ` --max_old_space_size=${(this.options && this.options.maxMemory) || 2048}`
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}
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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: nodeOptions,
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},
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stdio: ["ipc"],
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})
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}
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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", () => ipcMain().exit())
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}
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export const wrap = (fn: () => Promise<void>): void => {
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if (ipcMain().parentPid) {
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ipcMain()
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.handshake()
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.then(() => fn())
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.catch((error: ProcessError): void => {
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logger.error(error.message)
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ipcMain().exit(error)
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})
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} else {
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const wrapper = new WrapperProcess(require("../../package.json").version)
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wrapper.start().catch((error) => {
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logger.error(error.message)
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ipcMain().exit(error)
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})
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}
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}
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