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code-server/ci/dev/watch.ts

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import { spawn, fork, ChildProcess } from "child_process"
import { promises as fs } from "fs"
import * as path from "path"
import { CompilationStats, onLine, OnLineCallback } from "../../src/node/util"
interface DevelopmentCompilers {
[key: string]: ChildProcess | undefined
vscode: ChildProcess
vscodeWebExtensions: ChildProcess
codeServer: ChildProcess
plugins: ChildProcess | undefined
}
class Watcher {
private rootPath = path.resolve(process.cwd())
private readonly paths = {
/** Path to uncompiled VS Code source. */
vscodeDir: path.join(this.rootPath, "vendor", "modules", "code-oss-dev"),
compilationStatsFile: path.join(this.rootPath, "out", "watcher.json"),
pluginDir: process.env.PLUGIN_DIR,
}
//#region Web Server
/** Development web server. */
private webServer: ChildProcess | undefined
private reloadWebServer = (): void => {
if (this.webServer) {
this.webServer.kill()
}
// Pass CLI args, save for `node` and the initial script name.
const args = process.argv.slice(2)
this.webServer = fork(path.join(this.rootPath, "out/node/entry.js"), args)
const { pid } = this.webServer
this.webServer.on("exit", () => console.log("[Code Server]", `Web process ${pid} exited`))
console.log("\n[Code Server]", `Spawned web server process ${pid}`)
}
//#endregion
//#region Compilers
private readonly compilers: DevelopmentCompilers = {
codeServer: spawn("tsc", ["--watch", "--pretty", "--preserveWatchOutput"], { cwd: this.rootPath }),
vscode: spawn("yarn", ["watch"], { cwd: this.paths.vscodeDir }),
vscodeWebExtensions: spawn("yarn", ["watch-web"], { cwd: this.paths.vscodeDir }),
plugins: this.paths.pluginDir ? spawn("yarn", ["build", "--watch"], { cwd: this.paths.pluginDir }) : undefined,
}
public async initialize(): Promise<void> {
for (const event of ["SIGINT", "SIGTERM"]) {
process.on(event, () => this.dispose(0))
}
for (const [processName, devProcess] of Object.entries(this.compilers)) {
if (!devProcess) continue
devProcess.on("exit", (code) => {
console.log(`[${processName}]`, "Terminated unexpectedly")
this.dispose(code)
})
if (devProcess.stderr) {
devProcess.stderr.on("data", (d: string | Uint8Array) => process.stderr.write(d))
}
}
onLine(this.compilers.vscode, this.parseVSCodeLine)
onLine(this.compilers.codeServer, this.parseCodeServerLine)
if (this.compilers.plugins) {
onLine(this.compilers.plugins, this.parsePluginLine)
}
}
//#endregion
//#region Line Parsers
private parseVSCodeLine: OnLineCallback = (strippedLine, originalLine) => {
if (!strippedLine.length) return
console.log("[VS Code]", originalLine)
if (strippedLine.includes("Finished compilation with")) {
console.log("[VS Code] ✨ Finished compiling! ✨", "(Refresh your web browser ♻️)")
this.emitCompilationStats()
this.reloadWebServer()
}
}
private parseCodeServerLine: OnLineCallback = (strippedLine, originalLine) => {
if (!strippedLine.length) return
console.log("[Compiler][Code Server]", originalLine)
if (strippedLine.includes("Watching for file changes")) {
console.log("[Compiler][Code Server]", "Finished compiling!", "(Refresh your web browser ♻️)")
this.reloadWebServer()
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}
}
private parsePluginLine: OnLineCallback = (strippedLine, originalLine) => {
if (!strippedLine.length) return
console.log("[Compiler][Plugin]", originalLine)
if (strippedLine.includes("Watching for file changes...")) {
this.reloadWebServer()
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}
}
//#endregion
//#region Utilities
/**
* Emits a file containing compilation data.
* This is especially useful when Express needs to determine if VS Code is still compiling.
*/
private emitCompilationStats(): Promise<void> {
const stats: CompilationStats = {
lastCompiledAt: new Date(),
}
console.log("Writing watcher stats...")
return fs.writeFile(this.paths.compilationStatsFile, JSON.stringify(stats, null, 2))
}
private dispose(code: number | null): void {
for (const [processName, devProcess] of Object.entries(this.compilers)) {
console.log(`[${processName}]`, "Killing...\n")
devProcess?.removeAllListeners()
devProcess?.kill()
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}
process.exit(typeof code === "number" ? code : 0)
}
//#endregion
}
async function main(): Promise<void> {
try {
const watcher = new Watcher()
await watcher.initialize()
} catch (error: any) {
console.error(error.message)
process.exit(1)
}
}
main()