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import { logger, field } from "@coder/logger"

import * as cp from "child_process"

import { Emitter } from "../common/emitter"

interface HandshakeMessage {

type: "handshake"

}

interface RelaunchMessage {

type: "relaunch"

version: string

}

export type Message = RelaunchMessage | HandshakeMessage

export class ProcessError extends Error {

public constructor(message: string, public readonly code: number | undefined) {

super(message)

this.name = this.constructor.name

Error.captureStackTrace(this, this.constructor)

}

/**

* Allows the wrapper and inner processes to communicate.

export class IpcMain {

private readonly _onMessage = new Emitter<Message>()

public readonly onMessage = this._onMessage.event

private readonly _onDispose = new Emitter<NodeJS.Signals | undefined>()

public readonly onDispose = this._onDispose.event

public readonly exit: (code?: number) => never

public constructor(public readonly parentPid?: number) {

process.on("SIGINT", () => this._onDispose.emit("SIGINT"))

process.on("SIGTERM", () => this._onDispose.emit("SIGTERM"))

process.on("exit", () => this._onDispose.emit(undefined))

// Ensure we control when the process exits.

this.exit = process.exit

process.exit = function(code?: number) {

logger.warn(`process.exit() was prevented: ${code || "unknown code"}.`)

} as (code?: number) => never

this.onDispose((signal) => {

// Remove listeners to avoid possibly triggering disposal again.

process.removeAllListeners()

// Let any other handlers run first then exit.

logger.debug(`${parentPid ? "inner process" : "wrapper"} ${process.pid} disposing`, field("code", signal))

setTimeout(() => this.exit(0), 0)

})

// Kill the inner process if the parent dies. This is for the case where the

// parent process is forcefully terminated and cannot clean up.

if (parentPid) {

setInterval(() => {

try {

// process.kill throws an exception if the process doesn't exist.

process.kill(parentPid, 0)

} catch (_) {

// Consider this an error since it should have been able to clean up

// the child process unless it was forcefully killed.

logger.error(`parent process ${parentPid} died`)

this._onDispose.emit(undefined)

}

}, 5000)

}

public handshake(child?: cp.ChildProcess): Promise<void> {

return new Promise((resolve, reject) => {

const target = child || process

const onMessage = (message: Message): void => {

logger.debug(

`${child ? "wrapper" : "inner process"} ${process.pid} received message from ${

child ? child.pid : this.parentPid

}`,

field("message", message)

)

if (message.type === "handshake") {

target.removeListener("message", onMessage)

target.on("message", (msg) => this._onMessage.emit(msg))

// The wrapper responds once the inner process starts the handshake.

if (child) {

if (!target.send) {

throw new Error("child not spawned with IPC")

}

target.send({ type: "handshake" })

}

resolve()

}

target.on("message", onMessage)

if (child) {

child.once("error", reject)

child.once("exit", (code) => {

reject(new ProcessError(`Unexpected exit with code ${code}`, code !== null ? code : undefined))

})

} else {

// The inner process initiates the handshake.

this.send({ type: "handshake" })

}

})

}

public relaunch(version: string): void {

this.send({ type: "relaunch", version })

}

private send(message: Message): void {

if (!process.send) {

throw new Error("not spawned with IPC")

}

process.send(message)

}

let _ipcMain: IpcMain

export const ipcMain = (): IpcMain => {

if (!_ipcMain) {

_ipcMain = new IpcMain(

typeof process.env.CODE_SERVER_PARENT_PID !== "undefined"

? parseInt(process.env.CODE_SERVER_PARENT_PID)

: undefined

)

}

return _ipcMain

}

export interface WrapperOptions {

maxMemory?: number

nodeOptions?: string

}

/**

* Provides a way to wrap a process for the purpose of updating the running

* instance.

export class WrapperProcess {

private process?: cp.ChildProcess

private started?: Promise<void>

public constructor(private currentVersion: string, private readonly options?: WrapperOptions) {

ipcMain().onDispose(() => {

if (this.process) {

this.process.removeAllListeners()

this.process.kill()

}

})

ipcMain().onMessage(async (message) => {

switch (message.type) {

case "relaunch":

logger.info(`Relaunching: ${this.currentVersion} -> ${message.version}`)

this.currentVersion = message.version

this.started = undefined

if (this.process) {

this.process.removeAllListeners()

this.process.kill()

}

try {

await this.start()

} catch (error) {

logger.error(error.message)

ipcMain().exit(typeof error.code === "number" ? error.code : 1)

}

break

default:

logger.error(`Unrecognized message ${message}`)

break

}

})

}

public start(): Promise<void> {

if (!this.started) {

const child = this.spawn()

logger.debug(`spawned inner process ${child.pid}`)

this.started = ipcMain()

.handshake(child)

.then(() => {

child.once("exit", (code) => {

logger.debug(`inner process ${child.pid} exited unexpectedly`)

ipcMain().exit(code || 0)

})

this.process = child

}

return this.started

}

private spawn(): cp.ChildProcess {

// Flags to pass along to the Node binary.

let nodeOptions = `${process.env.NODE_OPTIONS || ""} ${(this.options && this.options.nodeOptions) || ""}`

if (!/max_old_space_size=(\d+)/g.exec(nodeOptions)) {

nodeOptions += ` --max_old_space_size=${(this.options && this.options.maxMemory) || 2048}`

}

return cp.fork(process.argv[1], process.argv.slice(2), {

env: {

...process.env,

CODE_SERVER_PARENT_PID: process.pid.toString(),

NODE_OPTIONS: nodeOptions,

})

}

// // It's possible that the pipe has closed (for example if you run code-server

// // --version | head -1). Assume that means we're done.

if (!process.stdout.isTTY) {

process.stdout.on("error", () => ipcMain().exit())

}

export const wrap = (fn: () => Promise<void>): void => {

if (ipcMain().parentPid) {

ipcMain()

.handshake()

.then(() => fn())

.catch((error: ProcessError): void => {

logger.error(error.message)

ipcMain().exit(typeof error.code === "number" ? error.code : 1)

})

} else {

const wrapper = new WrapperProcess(require("../../package.json").version)

wrapper.start().catch((error) => {

logger.error(error.message)

ipcMain().exit(typeof error.code === "number" ? error.code : 1)

})

}

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