dist/lib/process-manager.js.map

{
  "version": 3,
  "sources": ["../../lib/process-manager.ts"],
  "sourcesContent": ["/**\n * Process Manager\n * Pokemon Showdown - http://pokemonshowdown.com/\n *\n * This file abstract out multiprocess logic involved in several tasks.\n *\n * Child processes can be queried.\n *\n * @license MIT\n */\n\nimport * as child_process from 'child_process';\nimport * as cluster from 'cluster';\nimport * as path from 'path';\nimport * as Streams from './streams';\nimport { FS } from './fs';\n\ntype ChildProcess = child_process.ChildProcess;\ntype Worker = cluster.Worker;\n\nexport const processManagers: ProcessManager[] = [];\n\nexport function exec(\n\targs: string, execOptions?: child_process.ExecOptions\n): Promise<{ stderr: string, stdout: string }>;\nexport function exec(\n\targs: [string, ...string[]], execOptions?: child_process.ExecFileOptions\n): Promise<{ stderr: string, stdout: string }>;\nexport function exec(args: string | string[], execOptions?: AnyObject) {\n\tif (Array.isArray(args)) {\n\t\tconst cmd = args.shift();\n\t\tif (!cmd) throw new Error(`You must pass a command to ProcessManager.exec.`);\n\t\treturn new Promise<{ stderr: string, stdout: string }>((resolve, reject) => {\n\t\t\tchild_process.execFile(cmd, args, execOptions, (err, stdout, stderr) => {\n\t\t\t\tif (err) reject(err);\n\t\t\t\tif (typeof stdout !== 'string') stdout = stdout.toString();\n\t\t\t\tif (typeof stderr !== 'string') stderr = stderr.toString();\n\t\t\t\tresolve({ stdout, stderr });\n\t\t\t});\n\t\t});\n\t} else {\n\t\treturn new Promise<string>((resolve, reject) => {\n\t\t\tchild_process.exec(args, execOptions, (error, stdout, stderr) => {\n\t\t\t\tif (error) reject(error);\n\t\t\t\tif (typeof stdout !== 'string') stdout = stdout.toString();\n\t\t\t\tresolve(stdout);\n\t\t\t});\n\t\t});\n\t}\n}\n\nclass SubprocessStream extends Streams.ObjectReadWriteStream<string> {\n\tprocess: StreamProcessWrapper;\n\ttaskId: number;\n\tconstructor(process: StreamProcessWrapper, taskId: number) {\n\t\tsuper();\n\t\tthis.process = process;\n\t\tthis.taskId = taskId;\n\t\tthis.process.process.send(`${taskId}\\nNEW`);\n\t}\n\t_write(message: string) {\n\t\tif (!this.process.process.connected) {\n\t\t\tthis.pushError(new Error(`Process disconnected (possibly crashed?)`));\n\t\t\treturn;\n\t\t}\n\t\tthis.process.process.send(`${this.taskId}\\nWRITE\\n${message}`);\n\t\t// responses are handled in ProcessWrapper\n\t}\n\t_writeEnd() {\n\t\tthis.process.process.send(`${this.taskId}\\nWRITEEND`);\n\t}\n\t_destroy() {\n\t\tif (!this.process.process.connected) return;\n\t\tthis.process.process.send(`${this.taskId}\\nDESTROY`);\n\t\tthis.process.deleteStream(this.taskId);\n\t\tthis.process = null!;\n\t}\n}\n\nclass RawSubprocessStream extends Streams.ObjectReadWriteStream<string> {\n\tprocess: RawProcessWrapper;\n\tconstructor(process: RawProcessWrapper) {\n\t\tsuper();\n\t\tthis.process = process;\n\t}\n\t_write(message: string) {\n\t\tif (!this.process.getProcess().connected) {\n\t\t\t// no error because the crash handler should already have shown an error, and\n\t\t\t// sometimes harmless messages are sent during cleanup\n\t\t\treturn;\n\t\t}\n\t\tthis.process.process.send(message);\n\t\t// responses are handled in ProcessWrapper\n\t}\n}\n\nexport interface ProcessWrapper {\n\tgetLoad: () => number;\n\tprocess: ChildProcess | Worker;\n\trelease: () => Promise<void>;\n\tgetProcess: () => ChildProcess;\n}\n\n/** Wraps the process object in the PARENT process. */\nexport class QueryProcessWrapper<T, U> implements ProcessWrapper {\n\tprocess: ChildProcess;\n\ttaskId: number;\n\tpendingTasks: Map<number, (resp: U) => void>;\n\tmessageCallback: ((message: string) => any) | null;\n\tpendingRelease: Promise<void> | null;\n\tresolveRelease: (() => void) | null;\n\tdebug?: string;\n\tfile: string;\n\n\tconstructor(file: string, messageCallback?: (message: string) => any) {\n\t\tthis.process = child_process.fork(file, [], { cwd: FS.ROOT_PATH });\n\t\tthis.taskId = 0;\n\t\tthis.file = file;\n\t\tthis.pendingTasks = new Map();\n\t\tthis.pendingRelease = null;\n\t\tthis.resolveRelease = null;\n\t\tthis.messageCallback = messageCallback || null;\n\n\t\tthis.process.on('message', (message: string) => {\n\t\t\tif (message.startsWith('THROW\\n')) {\n\t\t\t\tconst error = new Error();\n\t\t\t\terror.stack = message.slice(6);\n\t\t\t\tthrow error;\n\t\t\t}\n\n\t\t\tif (message.startsWith('DEBUG\\n')) {\n\t\t\t\tthis.debug = message.slice(6);\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif (this.messageCallback && message.startsWith(`CALLBACK\\n`)) {\n\t\t\t\tthis.messageCallback(message.slice(9));\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst nlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc <= 0) throw new Error(`Invalid response ${message}`);\n\t\t\tconst taskId = parseInt(message.slice(0, nlLoc));\n\t\t\tconst resolve = this.pendingTasks.get(taskId);\n\t\t\tif (!resolve) throw new Error(`Invalid taskId ${message.slice(0, nlLoc)}`);\n\t\t\tthis.pendingTasks.delete(taskId);\n\t\t\tconst resp = this.safeJSON(message.slice(nlLoc + 1));\n\t\t\tresolve(resp);\n\n\t\t\tif (this.resolveRelease && !this.getLoad()) this.destroy();\n\t\t});\n\t}\n\tsafeJSON(obj: string): any {\n\t\t// special cases? undefined should strictly be fine\n\t\t// so let's just return it since we can't parse it\n\t\tif (obj === \"undefined\") {\n\t\t\treturn undefined;\n\t\t}\n\t\ttry {\n\t\t\treturn JSON.parse(obj);\n\t\t} catch (e: any) {\n\t\t\t// this is in the parent, so it should usually exist, but it's possible\n\t\t\t// it's also futureproofing in case other external modfules require this\n\t\t\t// we also specifically do not throw here because this json might be sensitive,\n\t\t\t// so we only want it to go to emails\n\t\t\t(global as any).Monitor?.crashlog?.(e, `a ${path.basename(this.file)} process`, { result: obj });\n\t\t\treturn undefined;\n\t\t}\n\t}\n\n\tgetProcess() {\n\t\treturn this.process;\n\t}\n\n\tgetLoad() {\n\t\treturn this.pendingTasks.size;\n\t}\n\n\tquery(input: T): Promise<U> {\n\t\tthis.taskId++;\n\t\tconst taskId = this.taskId;\n\t\tthis.process.send(`${taskId}\\n${JSON.stringify(input)}`);\n\t\treturn new Promise(resolve => {\n\t\t\tthis.pendingTasks.set(taskId, resolve);\n\t\t});\n\t}\n\n\trelease(): Promise<void> {\n\t\tif (this.pendingRelease) return this.pendingRelease;\n\t\tif (!this.getLoad()) {\n\t\t\tthis.destroy();\n\t\t} else {\n\t\t\tthis.pendingRelease = new Promise(resolve => {\n\t\t\t\tthis.resolveRelease = resolve;\n\t\t\t});\n\t\t}\n\t\treturn this.pendingRelease!;\n\t}\n\n\tdestroy() {\n\t\tif (this.pendingRelease && !this.resolveRelease) {\n\t\t\t// already destroyed\n\t\t\treturn;\n\t\t}\n\t\tthis.process.disconnect();\n\t\tfor (const resolver of this.pendingTasks.values()) {\n\t\t\t// maybe we should track reject functions too...\n\t\t\tresolver('' as any);\n\t\t}\n\t\tthis.pendingTasks.clear();\n\t\tif (this.resolveRelease) {\n\t\t\tthis.resolveRelease();\n\t\t\tthis.resolveRelease = null;\n\t\t} else if (!this.pendingRelease) {\n\t\t\tthis.pendingRelease = Promise.resolve();\n\t\t}\n\t}\n}\n\n/** Wraps the process object in the PARENT process. */\nexport class StreamProcessWrapper implements ProcessWrapper {\n\tprocess: ChildProcess;\n\ttaskId = 0;\n\tactiveStreams = new Map<number, SubprocessStream>();\n\tpendingRelease: Promise<void> | null = null;\n\tresolveRelease: (() => void) | null = null;\n\tdebug?: string;\n\n\tsetDebug(message: string) {\n\t\tthis.debug = (this.debug || '').slice(-32768) + '\\n=====\\n' + message;\n\t}\n\tmessageCallback?: (message: string) => any;\n\n\tconstructor(file: string, messageCallback?: (message: string) => any) {\n\t\tthis.process = child_process.fork(file, [], { cwd: FS.ROOT_PATH });\n\t\tthis.messageCallback = messageCallback;\n\n\t\tthis.process.on('message', (message: string) => {\n\t\t\tif (message.startsWith('THROW\\n')) {\n\t\t\t\tconst error = new Error();\n\t\t\t\terror.stack = message.slice(6);\n\t\t\t\tthrow error;\n\t\t\t}\n\n\t\t\tif (this.messageCallback && message.startsWith(`CALLBACK\\n`)) {\n\t\t\t\tthis.messageCallback(message.slice(9));\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif (message.startsWith('DEBUG\\n')) {\n\t\t\t\tthis.setDebug(message.slice(6));\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tlet nlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc <= 0) throw new Error(`Invalid response ${message}`);\n\t\t\tconst taskId = parseInt(message.slice(0, nlLoc));\n\t\t\tconst stream = this.activeStreams.get(taskId);\n\t\t\tif (!stream) return; // stream already destroyed\n\n\t\t\tmessage = message.slice(nlLoc + 1);\n\t\t\tnlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc < 0) nlLoc = message.length;\n\t\t\tconst messageType = message.slice(0, nlLoc);\n\t\t\tmessage = message.slice(nlLoc + 1);\n\n\t\t\tif (messageType === 'END') {\n\t\t\t\tstream.pushEnd();\n\t\t\t\tthis.deleteStream(taskId);\n\t\t\t} else if (messageType === 'PUSH') {\n\t\t\t\tstream.push(message);\n\t\t\t} else if (messageType === 'THROW') {\n\t\t\t\tconst error = new Error();\n\t\t\t\terror.stack = message;\n\t\t\t\tstream.pushError(error, true);\n\t\t\t} else {\n\t\t\t\tthrow new Error(`Unrecognized messageType ${messageType}`);\n\t\t\t}\n\t\t});\n\t}\n\n\tgetLoad() {\n\t\treturn this.activeStreams.size;\n\t}\n\n\tgetProcess() {\n\t\treturn this.process;\n\t}\n\n\tdeleteStream(taskId: number) {\n\t\tthis.activeStreams.delete(taskId);\n\t\t// try to release\n\t\tif (this.resolveRelease && !this.getLoad()) void this.destroy();\n\t}\n\n\tcreateStream(): SubprocessStream {\n\t\tthis.taskId++;\n\t\tconst taskId = this.taskId;\n\t\tconst stream = new SubprocessStream(this, taskId);\n\t\tthis.activeStreams.set(taskId, stream);\n\t\treturn stream;\n\t}\n\n\trelease(): Promise<void> {\n\t\tif (this.pendingRelease) return this.pendingRelease;\n\t\tif (!this.getLoad()) {\n\t\t\tvoid this.destroy();\n\t\t} else {\n\t\t\tthis.pendingRelease = new Promise(resolve => {\n\t\t\t\tthis.resolveRelease = resolve;\n\t\t\t});\n\t\t}\n\t\treturn this.pendingRelease!;\n\t}\n\n\tdestroy() {\n\t\tif (this.pendingRelease && !this.resolveRelease) {\n\t\t\t// already destroyed\n\t\t\treturn;\n\t\t}\n\t\tthis.process.disconnect();\n\t\tconst destroyed = [];\n\t\tfor (const stream of this.activeStreams.values()) {\n\t\t\tdestroyed.push(stream.destroy());\n\t\t}\n\t\tthis.activeStreams.clear();\n\t\tif (this.resolveRelease) {\n\t\t\tthis.resolveRelease();\n\t\t\tthis.resolveRelease = null;\n\t\t} else if (!this.pendingRelease) {\n\t\t\tthis.pendingRelease = Promise.resolve();\n\t\t}\n\t\treturn Promise.all(destroyed);\n\t}\n}\n\n/**\n * A container for a RawProcessManager stream. This is usually the\n * RawProcessWrapper, but it can also be a fake RawProcessWrapper if the PM is\n * told to spawn 0 worker processes.\n */\nexport class StreamWorker {\n\tload = 0;\n\tworkerid = 0;\n\tstream: Streams.ObjectReadWriteStream<string>;\n\tconstructor(stream: Streams.ObjectReadWriteStream<string>) {\n\t\tthis.stream = stream;\n\t}\n}\n\n/** Wraps the process object in the PARENT process. */\nexport class RawProcessWrapper implements ProcessWrapper, StreamWorker {\n\tprocess: ChildProcess & { process: undefined } | Worker;\n\ttaskId = 0;\n\tstream: RawSubprocessStream;\n\tpendingRelease: Promise<void> | null = null;\n\tresolveRelease: (() => void) | null = null;\n\tdebug?: string;\n\tworkerid = 0;\n\n\t/** Not managed by RawProcessWrapper itself */\n\tload = 0;\n\n\tsetDebug(message: string) {\n\t\tthis.debug = (this.debug || '').slice(-32768) + '\\n=====\\n' + message;\n\t}\n\n\tconstructor(file: string, isCluster?: boolean, env?: AnyObject) {\n\t\tif (isCluster) {\n\t\t\tthis.process = cluster.fork(env);\n\t\t\tthis.workerid = this.process.id;\n\t\t} else {\n\t\t\tthis.process = child_process.fork(file, [], { cwd: FS.ROOT_PATH, env }) as any;\n\t\t}\n\n\t\tthis.process.on('message', (message: string) => {\n\t\t\tthis.stream.push(message);\n\t\t});\n\n\t\tthis.stream = new RawSubprocessStream(this);\n\t}\n\n\tgetLoad() {\n\t\treturn this.load;\n\t}\n\tgetProcess() {\n\t\treturn this.process.process ? this.process.process : this.process;\n\t}\n\n\trelease(): Promise<void> {\n\t\tif (this.pendingRelease) return this.pendingRelease;\n\t\tif (!this.getLoad()) {\n\t\t\tvoid this.destroy();\n\t\t} else {\n\t\t\tthis.pendingRelease = new Promise(resolve => {\n\t\t\t\tthis.resolveRelease = resolve;\n\t\t\t});\n\t\t}\n\t\treturn this.pendingRelease!;\n\t}\n\n\tdestroy() {\n\t\tif (this.pendingRelease && !this.resolveRelease) {\n\t\t\t// already destroyed\n\t\t\treturn;\n\t\t}\n\t\tvoid this.stream.destroy();\n\t\tthis.process.disconnect();\n\t}\n}\n\n/**\n * A ProcessManager wraps a query function: A function that takes a\n * string and returns a string or Promise<string>.\n */\nexport abstract class ProcessManager<T extends ProcessWrapper = ProcessWrapper> {\n\tstatic disabled = false;\n\tprocesses: T[] = [];\n\treleasingProcesses: T[] = [];\n\tcrashedProcesses: T[] = [];\n\treadonly filename: string;\n\treadonly basename: string;\n\treadonly isParentProcess: boolean;\n\tcrashTime = 0;\n\tcrashRespawnCount = 0;\n\n\tconstructor(module: NodeJS.Module) {\n\t\tthis.filename = module.filename;\n\t\tthis.basename = path.basename(module.filename);\n\t\tthis.isParentProcess = (process.mainModule !== module || !process.send);\n\n\t\tthis.listen();\n\t}\n\tacquire() {\n\t\tif (!this.processes.length) {\n\t\t\treturn null;\n\t\t}\n\t\tlet lowestLoad = this.processes[0];\n\t\tfor (const process of this.processes) {\n\t\t\tif (process.getLoad() < lowestLoad.getLoad()) {\n\t\t\t\tlowestLoad = process;\n\t\t\t}\n\t\t}\n\t\treturn lowestLoad;\n\t}\n\treleaseCrashed(process: T) {\n\t\tconst index = this.processes.indexOf(process);\n\n\t\t// The process was shut down sanely, not crashed\n\t\tif (index < 0) return;\n\n\t\tthis.processes.splice(index, 1);\n\n\t\tthis.destroyProcess(process);\n\t\tvoid process.release().then(() => {\n\t\t\tconst releasingIndex = this.releasingProcesses.indexOf(process);\n\t\t\tif (releasingIndex >= 0) {\n\t\t\t\tthis.releasingProcesses.splice(releasingIndex, 1);\n\t\t\t}\n\t\t});\n\n\t\tconst now = Date.now();\n\t\tif (this.crashTime && now - this.crashTime > 30 * 60 * 1000) {\n\t\t\tthis.crashTime = 0;\n\t\t\tthis.crashRespawnCount = 0;\n\t\t}\n\t\tif (!this.crashTime) this.crashTime = now;\n\t\tthis.crashRespawnCount += 1;\n\t\t// Notify any global crash logger\n\t\tvoid Promise.reject(\n\t\t\tnew Error(`Process ${this.basename} ${process.getProcess().pid} crashed and had to be restarted`)\n\t\t);\n\t\tthis.releasingProcesses.push(process);\n\t\tthis.crashedProcesses.push(process);\n\n\t\t// only respawn processes if there have been fewer than 5 crashes in 30 minutes\n\t\tif (this.crashRespawnCount <= 5) {\n\t\t\tthis.spawn(this.processes.length + 1);\n\t\t}\n\t}\n\tunspawn() {\n\t\treturn Promise.all([...this.processes].map(\n\t\t\tprocess => this.unspawnOne(process)\n\t\t));\n\t}\n\tasync unspawnOne(process: T | null) {\n\t\tif (!process) return;\n\t\tthis.destroyProcess(process);\n\t\tconst processIndex = this.processes.indexOf(process);\n\t\tif (processIndex < 0) throw new Error('Process inactive');\n\t\tthis.processes.splice(this.processes.indexOf(process), 1);\n\t\tthis.releasingProcesses.push(process);\n\n\t\tawait process.release();\n\n\t\tconst index = this.releasingProcesses.indexOf(process);\n\t\tif (index < 0) return; // can happen if process crashed while releasing\n\t\tthis.releasingProcesses.splice(index, 1);\n\t}\n\tspawn(count = 1, force?: boolean) {\n\t\tif (!this.isParentProcess) return;\n\t\tif (ProcessManager.disabled && !force) return;\n\t\tconst spawnCount = count - this.processes.length;\n\t\tfor (let i = 0; i < spawnCount; i++) {\n\t\t\tthis.spawnOne(force);\n\t\t}\n\t}\n\tspawnOne(force?: boolean) {\n\t\tif (!this.isParentProcess) throw new Error('Must use in parent process');\n\t\tif (ProcessManager.disabled && !force) return null;\n\t\tconst process = this.createProcess();\n\t\tprocess.process.on('disconnect', () => this.releaseCrashed(process));\n\t\tthis.processes.push(process);\n\t\treturn process;\n\t}\n\trespawn(count: number | null = null) {\n\t\tif (count === null) count = this.processes.length;\n\t\tconst unspawned = this.unspawn();\n\t\tthis.spawn(count);\n\t\treturn unspawned;\n\t}\n\tabstract listen(): void;\n\tabstract createProcess(...args: any): T;\n\tdestroyProcess(process: T) {}\n\tdestroy() {\n\t\tconst index = processManagers.indexOf(this);\n\t\tif (index >= 0) processManagers.splice(index, 1);\n\t\treturn this.unspawn();\n\t}\n}\n\nexport class QueryProcessManager<T = string, U = string> extends ProcessManager<QueryProcessWrapper<T, U>> {\n\t_query: (input: T) => U | Promise<U>;\n\tmessageCallback?: (message: string) => any;\n\ttimeout: number;\n\n\t/**\n\t * @param timeout The number of milliseconds to wait before terminating a query. Defaults to 900000 ms (15 minutes).\n\t */\n\tconstructor(\n\t\tmodule: NodeJS.Module, query: (input: T) => U | Promise<U>,\n\t\ttimeout = 15 * 60 * 1000, debugCallback?: (message: string) => any\n\t) {\n\t\tsuper(module);\n\t\tthis._query = query;\n\t\tthis.timeout = timeout;\n\t\tthis.messageCallback = debugCallback;\n\n\t\tprocessManagers.push(this);\n\t}\n\tasync query(input: T, process = this.acquire()) {\n\t\tif (!process) return this._query(input);\n\n\t\tconst timeout = setTimeout(() => {\n\t\t\tconst debugInfo = process.debug || \"No debug information found.\";\n\t\t\tprocess.destroy();\n\t\t\tthis.spawnOne();\n\t\t\tthrow new Error(\n\t\t\t\t`A query originating in ${this.basename} took too long to complete; the process has been respawned.\\n${debugInfo}`\n\t\t\t);\n\t\t}, this.timeout);\n\n\t\tconst result = await process.query(input);\n\n\t\tclearTimeout(timeout);\n\t\treturn result;\n\t}\n\tqueryTemporaryProcess(input: T, force?: boolean) {\n\t\tconst process = this.spawnOne(force);\n\t\tconst result = this.query(input, process);\n\t\tvoid this.unspawnOne(process);\n\t\treturn result;\n\t}\n\tcreateProcess() {\n\t\treturn new QueryProcessWrapper<T, U>(this.filename, this.messageCallback);\n\t}\n\tlisten() {\n\t\tif (this.isParentProcess) return;\n\t\t// child process\n\t\tprocess.on('message', (message: string) => {\n\t\t\tconst nlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc <= 0) throw new Error(`Invalid response ${message}`);\n\t\t\tconst taskId = message.slice(0, nlLoc);\n\t\t\tmessage = message.slice(nlLoc + 1);\n\n\t\t\tif (taskId.startsWith('EVAL')) {\n\t\t\t\t// eslint-disable-next-line no-eval\n\t\t\t\tprocess.send!(`${taskId}\\n` + eval(message));\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tvoid Promise.resolve(this._query(JSON.parse(message))).then(\n\t\t\t\tresponse => process.send!(`${taskId}\\n${JSON.stringify(response)}`)\n\t\t\t);\n\t\t});\n\t\tprocess.on('disconnect', () => {\n\t\t\tprocess.exit();\n\t\t});\n\t}\n}\n\nexport class StreamProcessManager extends ProcessManager<StreamProcessWrapper> {\n\t/* taskid: stream used only in child process */\n\tactiveStreams: Map<string, Streams.ObjectReadWriteStream<string>>;\n\t_createStream: () => Streams.ObjectReadWriteStream<string>;\n\tmessageCallback?: (message: string) => any;\n\n\tconstructor(\n\t\tmodule: NodeJS.Module,\n\t\tcreateStream: () => Streams.ObjectReadWriteStream<string>,\n\t\tmessageCallback?: (message: string) => any\n\t) {\n\t\tsuper(module);\n\t\tthis.activeStreams = new Map();\n\t\tthis._createStream = createStream;\n\t\tthis.messageCallback = messageCallback;\n\n\t\tprocessManagers.push(this);\n\t}\n\tcreateStream() {\n\t\tconst process = this.acquire();\n\t\tif (!process) return this._createStream();\n\t\treturn process.createStream();\n\t}\n\tcreateProcess() {\n\t\treturn new StreamProcessWrapper(this.filename, this.messageCallback);\n\t}\n\tasync pipeStream(taskId: string, stream: Streams.ObjectReadStream<string>) {\n\t\tlet done = false;\n\t\twhile (!done) {\n\t\t\ttry {\n\t\t\t\tlet value;\n\t\t\t\t({ value, done } = await stream.next());\n\t\t\t\tprocess.send!(`${taskId}\\nPUSH\\n${value}`);\n\t\t\t} catch (err: any) {\n\t\t\t\tprocess.send!(`${taskId}\\nTHROW\\n${err.stack}`);\n\t\t\t}\n\t\t}\n\t\tif (!this.activeStreams.has(taskId)) {\n\t\t\t// stream.destroy() was called, don't send an END message\n\t\t\treturn;\n\t\t}\n\t\tprocess.send!(`${taskId}\\nEND`);\n\t\tthis.activeStreams.delete(taskId);\n\t}\n\tlisten() {\n\t\tif (this.isParentProcess) return;\n\t\t// child process\n\t\tprocess.on('message', (message: string) => {\n\t\t\tlet nlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc <= 0) throw new Error(`Invalid request ${message}`);\n\t\t\tconst taskId = message.slice(0, nlLoc);\n\t\t\tconst stream = this.activeStreams.get(taskId);\n\n\t\t\tmessage = message.slice(nlLoc + 1);\n\t\t\tnlLoc = message.indexOf('\\n');\n\t\t\tif (nlLoc < 0) nlLoc = message.length;\n\t\t\tconst messageType = message.slice(0, 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  "names": ["process", "taskId", "message", "nlLoc", "stream", "messageType", "module"]
}