forked from Fediversity/fediversity.eu
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1 line
17 KiB
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Note: since nyc uses this module to output coverage, any lines\n// that are in the direct sync flow of nyc's outputCoverage are\n// ignored, since we can never get coverage for them.\n// grab a reference to node's real process object right away\nimport { signals } from './signals.js'\nexport { signals }\n\n// just a loosened process type so we can do some evil things\ntype ProcessRE = NodeJS.Process & {\n reallyExit: (code?: number | undefined | null) => any\n emit: (ev: string, ...a: any[]) => any\n}\n\nconst processOk = (process: any): process is ProcessRE =>\n !!process &&\n typeof process === 'object' &&\n typeof process.removeListener === 'function' &&\n typeof process.emit === 'function' &&\n typeof process.reallyExit === 'function' &&\n typeof process.listeners === 'function' &&\n typeof process.kill === 'function' &&\n typeof process.pid === 'number' &&\n typeof process.on === 'function'\n\nconst kExitEmitter = Symbol.for('signal-exit emitter')\nconst global: typeof globalThis & { [kExitEmitter]?: Emitter } = globalThis\nconst ObjectDefineProperty = Object.defineProperty.bind(Object)\n\n/**\n * A function that takes an exit code and signal as arguments\n *\n * In the case of signal exits *only*, a return value of true\n * will indicate that the signal is being handled, and we should\n * not synthetically exit with the signal we received. Regardless\n * of the handler return value, the handler is unloaded when an\n * otherwise fatal signal is received, so you get exactly 1 shot\n * at it, unless you add another onExit handler at that point.\n *\n * In the case of numeric code exits, we may already have committed\n * to exiting the process, for example via a fatal exception or\n * unhandled promise rejection, so it is impossible to stop safely.\n */\nexport type Handler = (\n code: number | null | undefined,\n signal: NodeJS.Signals | null\n) => true | void\ntype ExitEvent = 'afterExit' | 'exit'\ntype Emitted = { [k in ExitEvent]: boolean }\ntype Listeners = { [k in ExitEvent]: Handler[] }\n\n// teeny special purpose ee\nclass Emitter {\n emitted: Emitted = {\n afterExit: false,\n exit: false,\n }\n\n listeners: Listeners = {\n afterExit: [],\n exit: [],\n }\n\n count: number = 0\n id: number = Math.random()\n\n constructor() {\n if (global[kExitEmitter]) {\n return global[kExitEmitter]\n }\n ObjectDefineProperty(global, kExitEmitter, {\n value: this,\n writable: false,\n enumerable: false,\n configurable: false,\n })\n }\n\n on(ev: ExitEvent, fn: Handler) {\n this.listeners[ev].push(fn)\n }\n\n removeListener(ev: ExitEvent, fn: Handler) {\n const list = this.listeners[ev]\n const i = list.indexOf(fn)\n /* c8 ignore start */\n if (i === -1) {\n return\n }\n /* c8 ignore stop */\n if (i === 0 && list.length === 1) {\n list.length = 0\n } else {\n list.splice(i, 1)\n }\n }\n\n emit(\n ev: ExitEvent,\n code: number | null | undefined,\n signal: NodeJS.Signals | null\n ): boolean {\n if (this.emitted[ev]) {\n return false\n }\n this.emitted[ev] = true\n let ret: boolean = false\n for (const fn of this.listeners[ev]) {\n ret = fn(code, signal) === true || ret\n }\n if (ev === 'exit') {\n ret = this.emit('afterExit', code, signal) || ret\n }\n return ret\n }\n}\n\nabstract class SignalExitBase {\n abstract onExit(cb: Handler, opts?: { alwaysLast?: boolean }): () => void\n abstract load(): void\n abstract unload(): void\n}\n\nconst signalExitWrap = <T extends SignalExitBase>(handler: T) => {\n return {\n onExit(cb: Handler, opts?: { alwaysLast?: boolean }) {\n return handler.onExit(cb, opts)\n },\n load() {\n return handler.load()\n },\n unload() {\n return handler.unload()\n },\n }\n}\n\nclass SignalExitFallback extends SignalExitBase {\n onExit() {\n return () => {}\n }\n load() {}\n unload() {}\n}\n\nclass SignalExit extends SignalExitBase {\n // \"SIGHUP\" throws an `ENOSYS` error on Windows,\n // so use a supported signal instead\n /* c8 ignore start */\n #hupSig = process.platform === 'win32' ? 'SIGINT' : 'SIGHUP'\n /* c8 ignore stop */\n #emitter = new Emitter()\n #process: ProcessRE\n #originalProcessEmit: ProcessRE['emit']\n #originalProcessReallyExit: ProcessRE['reallyExit']\n\n #sigListeners: { [k in NodeJS.Signals]?: () => void } = {}\n #loaded: boolean = false\n\n constructor(process: ProcessRE) {\n super()\n this.#process = process\n // { <signal>: <listener fn>, ... }\n this.#sigListeners = {}\n for (const sig of signals) {\n this.#sigListeners[sig] = () => {\n // If there are no other listeners, an exit is coming!\n // Simplest way: remove us and then re-send the signal.\n // We know that this will kill the process, so we can\n // safely emit now.\n const listeners = this.#process.listeners(sig)\n let { count } = this.#emitter\n // This is a workaround for the fact that signal-exit v3 and signal\n // exit v4 are not aware of each other, and each will attempt to let\n // the other handle it, so neither of them do. To correct this, we\n // detect if we're the only handler *except* for previous versions\n // of signal-exit, and increment by the count of listeners it has\n // created.\n /* c8 ignore start */\n const p = process as unknown as {\n __signal_exit_emitter__?: { count: number }\n }\n if (\n typeof p.__signal_exit_emitter__ === 'object' &&\n typeof p.__signal_exit_emitter__.count === 'number'\n ) {\n count += p.__signal_exit_emitter__.count\n }\n /* c8 ignore stop */\n if (listeners.length === count) {\n this.unload()\n const ret = this.#emitter.emit('exit', null, sig)\n /* c8 ignore start */\n const s = sig === 'SIGHUP' ? this.#hupSig : sig\n if (!ret) process.kill(process.pid, s)\n /* c8 ignore stop */\n }\n }\n }\n\n this.#originalProcessReallyExit = process.reallyExit\n this.#originalProcessEmit = process.emit\n }\n\n onExit(cb: Handler, opts?: { alwaysLast?: boolean }) {\n /* c8 ignore start */\n if (!processOk(this.#process)) {\n return () => {}\n }\n /* c8 ignore stop */\n\n if (this.#loaded === false) {\n this.load()\n }\n\n const ev = opts?.alwaysLast ? 'afterExit' : 'exit'\n this.#emitter.on(ev, cb)\n return () => {\n this.#emitter.removeListener(ev, cb)\n if (\n this.#emitter.listeners['exit'].length === 0 &&\n this.#emitter.listeners['afterExit'].length === 0\n ) {\n this.unload()\n }\n }\n }\n\n load() {\n if (this.#loaded) {\n return\n }\n this.#loaded = true\n\n // This is the number of onSignalExit's that are in play.\n // It's important so that we can count the correct number of\n // listeners on signals, and don't wait for the other one to\n // handle it instead of us.\n this.#emitter.count += 1\n\n for (const sig of signals) {\n try {\n const fn = this.#sigListeners[sig]\n if (fn) this.#process.on(sig, fn)\n } catch (_) {}\n }\n\n this.#process.emit = (ev: string, ...a: any[]) => {\n return this.#processEmit(ev, ...a)\n }\n this.#process.reallyExit = (code?: number | null | undefined) => {\n return this.#processReallyExit(code)\n }\n }\n\n unload() {\n if (!this.#loaded) {\n return\n }\n this.#loaded = false\n\n signals.forEach(sig => {\n const listener = this.#sigListeners[sig]\n /* c8 ignore start */\n if (!listener) {\n throw new Error('Listener not defined for signal: ' + sig)\n }\n /* c8 ignore stop */\n try {\n this.#process.removeListener(sig, listener)\n /* c8 ignore start */\n } catch (_) {}\n /* c8 ignore stop */\n })\n this.#process.emit = this.#originalProcessEmit\n this.#process.reallyExit = this.#originalProcessReallyExit\n this.#emitter.count -= 1\n }\n\n #processReallyExit(code?: number | null | undefined) {\n /* c8 ignore start */\n if (!processOk(this.#process)) {\n return 0\n }\n this.#process.exitCode = code || 0\n /* c8 ignore stop */\n\n this.#emitter.emit('exit', this.#process.exitCode, null)\n return this.#originalProcessReallyExit.call(\n this.#process,\n this.#process.exitCode\n )\n }\n\n #processEmit(ev: string, ...args: any[]): any {\n const og = this.#originalProcessEmit\n if (ev === 'exit' && processOk(this.#process)) {\n if (typeof args[0] === 'number') {\n this.#process.exitCode = args[0]\n /* c8 ignore start */\n }\n /* c8 ignore start */\n const ret = og.call(this.#process, ev, ...args)\n /* c8 ignore start */\n this.#emitter.emit('exit', this.#process.exitCode, null)\n /* c8 ignore stop */\n return ret\n } else {\n return og.call(this.#process, ev, ...args)\n }\n }\n}\n\nconst process = globalThis.process\n// wrap so that we call the method on the actual handler, without\n// exporting it directly.\nexport const {\n /**\n * Called when the process is exiting, whether via signal, explicit\n * exit, or running out of stuff to do.\n *\n * If the global process object is not suitable for instrumentation,\n * then this will be a no-op.\n *\n * Returns a function that may be used to unload signal-exit.\n */\n onExit,\n\n /**\n * Load the listeners. Likely you never need to call this, unless\n * doing a rather deep integration with signal-exit functionality.\n * Mostly exposed for the benefit of testing.\n *\n * @internal\n */\n load,\n\n /**\n * Unload the listeners. Likely you never need to call this, unless\n * doing a rather deep integration with signal-exit functionality.\n * Mostly exposed for the benefit of testing.\n *\n * @internal\n */\n unload,\n} = signalExitWrap(\n processOk(process) ? new SignalExit(process) : new SignalExitFallback()\n)\n"]} |