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Refactor wrapper

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- Immediately create ipcMain so it doesn't have to be a function which I
  think feels cleaner.
  - Move exit handling to a separate function to compensate (otherwise
    the VS Code CLI for example won't be able to exit on its own).
- New isChild prop that is clearer than checking for parentPid (IMO).
- Skip all the checks that aren't necessary for the child process (like
  --help, --version, etc).
  - Since we check if we're the child in entry go ahead and move the
    wrap code into entry as well since that's basically what it does.
- Use a single catch at the end of the entry.
- Split out the VS Code CLI and existing instance code into separate
  functions.
This commit is contained in:
Asher 2020-09-14 15:57:58 -05:00
parent 6bdaada689
commit 0a8e71c647
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GPG Key ID: D63C1EF81242354A
3 changed files with 199 additions and 154 deletions
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20
src/node/cli.ts
View File

@ -496,3 +496,23 @@ async function copyOldMacOSDataDir(): Promise<void> {
await fs.copy(oldDataDir, paths.data)
}
}
export const shouldRunVsCodeCli = (args: Args): boolean => {
return !!args["list-extensions"] || !!args["install-extension"] || !!args["uninstall-extension"]
}
/**
* Determine if it looks like the user is trying to open a file or folder in an
* existing instance. The arguments here should be the arguments the user
* explicitly passed on the command line, not defaults or the configuration.
*/
export const shouldOpenInExistingInstance = async (args: Args): Promise<string | undefined> => {
// Always use the existing instance if we're running from VS Code's terminal.
if (process.env.VSCODE_IPC_HOOK_CLI) {
return process.env.VSCODE_IPC_HOOK_CLI
}
// TODO: implement
return undefined
}

231
src/node/entry.ts
View File

@ -11,12 +11,21 @@ import { ProxyHttpProvider } from "./app/proxy"
import { StaticHttpProvider } from "./app/static"
import { UpdateHttpProvider } from "./app/update"
import { VscodeHttpProvider } from "./app/vscode"
import { Args, bindAddrFromAllSources, optionDescriptions, parse, readConfigFile, setDefaults } from "./cli"
import {
Args,
bindAddrFromAllSources,
optionDescriptions,
parse,
readConfigFile,
setDefaults,
shouldOpenInExistingInstance,
shouldRunVsCodeCli,
} from "./cli"
import { coderCloudBind } from "./coder-cloud"
import { AuthType, HttpServer, HttpServerOptions } from "./http"
import { loadPlugins } from "./plugin"
import { generateCertificate, hash, humanPath, open } from "./util"
import { ipcMain, wrap } from "./wrapper"
import { ipcMain, WrapperProcess } from "./wrapper"
let pkg: { version?: string; commit?: string } = {}
try {
@ -28,6 +37,86 @@ try {
const version = pkg.version || "development"
const commit = pkg.commit || "development"
export const runVsCodeCli = (args: Args): void => {
logger.debug("forking vs code cli...")
const vscode = cp.fork(path.resolve(__dirname, "../../lib/vscode/out/vs/server/fork"), [], {
env: {
...process.env,
CODE_SERVER_PARENT_PID: process.pid.toString(),
},
})
vscode.once("message", (message: any) => {
logger.debug("got message from VS Code", field("message", message))
if (message.type !== "ready") {
logger.error("Unexpected response waiting for ready response", field("type", message.type))
process.exit(1)
}
const send: CliMessage = { type: "cli", args }
vscode.send(send)
})
vscode.once("error", (error) => {
logger.error("Got error from VS Code", field("error", error))
process.exit(1)
})
vscode.on("exit", (code) => process.exit(code || 0))
}
export const openInExistingInstance = async (args: Args, socketPath: string): Promise<void> => {
const pipeArgs: OpenCommandPipeArgs & { fileURIs: string[] } = {
type: "open",
folderURIs: [],
fileURIs: [],
forceReuseWindow: args["reuse-window"],
forceNewWindow: args["new-window"],
}
const isDir = async (path: string): Promise<boolean> => {
try {
const st = await fs.stat(path)
return st.isDirectory()
} catch (error) {
return false
}
}
for (let i = 0; i < args._.length; i++) {
const fp = path.resolve(args._[i])
if (await isDir(fp)) {
pipeArgs.folderURIs.push(fp)
} else {
pipeArgs.fileURIs.push(fp)
}
}
if (pipeArgs.forceNewWindow && pipeArgs.fileURIs.length > 0) {
logger.error("--new-window can only be used with folder paths")
process.exit(1)
}
if (pipeArgs.folderURIs.length === 0 && pipeArgs.fileURIs.length === 0) {
logger.error("Please specify at least one file or folder")
process.exit(1)
}
const vscode = http.request(
{
path: "/",
method: "POST",
socketPath,
},
(response) => {
response.on("data", (message) => {
logger.debug("got message from VS Code", field("message", message.toString()))
})
},
)
vscode.on("error", (error: unknown) => {
logger.error("got error from VS Code", field("error", error))
})
vscode.write(JSON.stringify(pipeArgs))
vscode.end()
}
const main = async (args: Args, configArgs: Args): Promise<void> => {
if (args.link) {
// If we're being exposed to the cloud, we listen on a random address and disable auth.
@ -92,7 +181,7 @@ const main = async (args: Args, configArgs: Args): Promise<void> => {
await loadPlugins(httpServer, args)
ipcMain().onDispose(() => {
ipcMain.onDispose(() => {
httpServer.dispose().then((errors) => {
errors.forEach((error) => logger.error(error.message))
})
@ -132,7 +221,9 @@ const main = async (args: Args, configArgs: Args): Promise<void> => {
if (serverAddress && !options.socket && args.open) {
// The web socket doesn't seem to work if browsing with 0.0.0.0.
const openAddress = serverAddress.replace(/:\/\/0.0.0.0/, "://localhost")
await open(openAddress).catch(console.error)
await open(openAddress).catch((error: Error) => {
logger.error("Failed to open", field("address", openAddress), field("error", error))
})
logger.info(`Opened ${openAddress}`)
}
@ -141,27 +232,32 @@ const main = async (args: Args, configArgs: Args): Promise<void> => {
await coderCloudBind(serverAddress!, args.link.value)
} catch (err) {
logger.error(err.message)
ipcMain().exit(1)
ipcMain.exit(1)
}
}
}
async function entry(): Promise<void> {
const tryParse = async (): Promise<[Args, Args]> => {
try {
const cliArgs = parse(process.argv.slice(2))
const configArgs = await readConfigFile(cliArgs.config)
// This prioritizes the flags set in args over the ones in the config file.
let args = Object.assign(configArgs, cliArgs)
args = await setDefaults(args)
return [args, configArgs]
} catch (error) {
console.error(error.message)
process.exit(1)
}
const tryParse = async (): Promise<[Args, Args, Args]> => {
const cliArgs = parse(process.argv.slice(2))
const configArgs = await readConfigFile(cliArgs.config)
// This prioritizes the flags set in args over the ones in the config file.
let args = Object.assign(configArgs, cliArgs)
args = await setDefaults(args)
return [args, cliArgs, configArgs]
}
const [args, cliArgs, configArgs] = await tryParse()
// There's no need to check flags like --help or to spawn in an existing
// instance for the child process because these would have already happened in
// the parent and the child wouldn't have been spawned.
if (ipcMain.isChild) {
await ipcMain.handshake()
ipcMain.preventExit()
return main(args, configArgs)
}
const [args, configArgs] = await tryParse()
if (args.help) {
console.log("code-server", version, commit)
console.log("")
@ -171,7 +267,10 @@ async function entry(): Promise<void> {
optionDescriptions().forEach((description) => {
console.log("", description)
})
} else if (args.version) {
return
}
if (args.version) {
if (args.json) {
console.log({
codeServer: version,
@ -181,83 +280,23 @@ async function entry(): Promise<void> {
} else {
console.log(version, commit)
}
process.exit(0)
} else if (args["list-extensions"] || args["install-extension"] || args["uninstall-extension"]) {
logger.debug("forking vs code cli...")
const vscode = cp.fork(path.resolve(__dirname, "../../lib/vscode/out/vs/server/fork"), [], {
env: {
...process.env,
CODE_SERVER_PARENT_PID: process.pid.toString(),
},
})
vscode.once("message", (message: any) => {
logger.debug("Got message from VS Code", field("message", message))
if (message.type !== "ready") {
logger.error("Unexpected response waiting for ready response")
process.exit(1)
}
const send: CliMessage = { type: "cli", args }
vscode.send(send)
})
vscode.once("error", (error) => {
logger.error(error.message)
process.exit(1)
})
vscode.on("exit", (code) => process.exit(code || 0))
} else if (process.env.VSCODE_IPC_HOOK_CLI) {
const pipeArgs: OpenCommandPipeArgs = {
type: "open",
folderURIs: [],
forceReuseWindow: args["reuse-window"],
forceNewWindow: args["new-window"],
}
const isDir = async (path: string): Promise<boolean> => {
try {
const st = await fs.stat(path)
return st.isDirectory()
} catch (error) {
return false
}
}
for (let i = 0; i < args._.length; i++) {
const fp = path.resolve(args._[i])
if (await isDir(fp)) {
pipeArgs.folderURIs.push(fp)
} else {
if (!pipeArgs.fileURIs) {
pipeArgs.fileURIs = []
}
pipeArgs.fileURIs.push(fp)
}
}
if (pipeArgs.forceNewWindow && pipeArgs.fileURIs && pipeArgs.fileURIs.length > 0) {
logger.error("new-window can only be used with folder paths")
process.exit(1)
}
if (pipeArgs.folderURIs.length === 0 && (!pipeArgs.fileURIs || pipeArgs.fileURIs.length === 0)) {
logger.error("Please specify at least one file or folder argument")
process.exit(1)
}
const vscode = http.request(
{
path: "/",
method: "POST",
socketPath: process.env["VSCODE_IPC_HOOK_CLI"],
},
(res) => {
res.on("data", (message) => {
logger.debug("Got message from VS Code", field("message", message.toString()))
})
},
)
vscode.on("error", (err) => {
logger.debug("Got error from VS Code", field("error", err))
})
vscode.write(JSON.stringify(pipeArgs))
vscode.end()
} else {
wrap(() => main(args, configArgs))
return
}
if (shouldRunVsCodeCli(args)) {
return runVsCodeCli(args)
}
const socketPath = await shouldOpenInExistingInstance(cliArgs)
if (socketPath) {
return openInExistingInstance(args, socketPath)
}
const wrapper = new WrapperProcess(require("../../package.json").version)
return wrapper.start()
}
entry()
entry().catch((error) => {
logger.error(error.message)
ipcMain.exit(error)
})

102
src/node/wrapper.ts
View File

@ -32,19 +32,13 @@ export class IpcMain {
public readonly onMessage = this._onMessage.event
private readonly _onDispose = new Emitter<NodeJS.Signals | undefined>()
public readonly onDispose = this._onDispose.event
public readonly processExit: (code?: number) => never
public readonly processExit: (code?: number) => never = process.exit
public constructor(public readonly parentPid?: number) {
public constructor(private 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.processExit = 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()
@ -71,6 +65,19 @@ export class IpcMain {
}
}
/**
* Ensure we control when the process exits.
*/
public preventExit(): void {
process.exit = function (code?: number) {
logger.warn(`process.exit() was prevented: ${code || "unknown code"}.`)
} as (code?: number) => never
}
public get isChild(): boolean {
return typeof this.parentPid !== "undefined"
}
public exit(error?: number | ProcessError): never {
if (error && typeof error !== "number") {
this.processExit(typeof error.code === "number" ? error.code : 1)
@ -127,17 +134,12 @@ export class IpcMain {
}
}
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
}
/**
* Channel for communication between the child and parent processes.
*/
export const ipcMain = new IpcMain(
typeof process.env.CODE_SERVER_PARENT_PID !== "undefined" ? parseInt(process.env.CODE_SERVER_PARENT_PID) : undefined,
)
export interface WrapperOptions {
maxMemory?: number
@ -162,14 +164,11 @@ export class WrapperProcess {
this.logStdoutStream = rfs.createStream(path.join(paths.data, "coder-logs", "code-server-stdout.log"), opts)
this.logStderrStream = rfs.createStream(path.join(paths.data, "coder-logs", "code-server-stderr.log"), opts)
ipcMain().onDispose(() => {
if (this.process) {
this.process.removeAllListeners()
this.process.kill()
}
ipcMain.onDispose(() => {
this.disposeChild()
})
ipcMain().onMessage((message) => {
ipcMain.onMessage((message) => {
switch (message.type) {
case "relaunch":
logger.info(`Relaunching: ${this.currentVersion} -> ${message.version}`)
@ -181,28 +180,35 @@ export class WrapperProcess {
break
}
})
process.on("SIGUSR1", async () => {
logger.info("Received SIGUSR1; hotswapping")
this.relaunch()
})
}
private async relaunch(): Promise<void> {
private disposeChild(): void {
this.started = undefined
if (this.process) {
this.process.removeAllListeners()
this.process.kill()
}
}
private async relaunch(): Promise<void> {
this.disposeChild()
try {
await this.start()
} catch (error) {
logger.error(error.message)
ipcMain().exit(typeof error.code === "number" ? error.code : 1)
ipcMain.exit(typeof error.code === "number" ? error.code : 1)
}
}
public start(): Promise<void> {
// If we have a process then we've already bound this.
if (!this.process) {
process.on("SIGUSR1", async () => {
logger.info("Received SIGUSR1; hotswapping")
this.relaunch()
})
}
if (!this.started) {
this.started = this.spawn().then((child) => {
// Log both to stdout and to the log directory.
@ -215,14 +221,12 @@ export class WrapperProcess {
child.stderr.pipe(process.stderr)
}
logger.debug(`spawned inner process ${child.pid}`)
ipcMain()
.handshake(child)
.then(() => {
child.once("exit", (code) => {
logger.debug(`inner process ${child.pid} exited unexpectedly`)
ipcMain().exit(code || 0)
})
ipcMain.handshake(child).then(() => {
child.once("exit", (code) => {
logger.debug(`inner process ${child.pid} exited unexpectedly`)
ipcMain.exit(code || 0)
})
})
this.process = child
})
}
@ -251,7 +255,7 @@ export class WrapperProcess {
// 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())
process.stdout.on("error", () => ipcMain.exit())
}
// Don't let uncaught exceptions crash the process.
@ -261,21 +265,3 @@ process.on("uncaughtException", (error) => {
logger.error(error.stack)
}
})
export const wrap = (fn: () => Promise<void>): void => {
if (ipcMain().parentPid) {
ipcMain()
.handshake()
.then(() => fn())
.catch((error: ProcessError): void => {
logger.error(error.message)
ipcMain().exit(error)
})
} else {
const wrapper = new WrapperProcess(require("../../package.json").version)
wrapper.start().catch((error) => {
logger.error(error.message)
ipcMain().exit(error)
})
}
}