All files / lib/internal worker.js

98.47% Statements 515/523
95.21% Branches 139/146
95.45% Functions 21/22
98.47% Lines 515/523

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 163x 113x 113x 113x 113x 113x 113x 113x 105x 105x 105x 350x 350x 105x 105x 113x 5x 5x 5x 3x 3x 5x 113x 10x 10x 10x 113x 391x 391x 391x 6x 391x 391x 113x 113x 113x 679x 679x 679x 2x 2x 2x 2x 677x 679x 5x 5x 5x 676x 676x 679x 463x 1x 1x 1x 1x 1x 1x 462x 462x 679x 7x 7x 7x 213x 206x 206x 3x 3x 206x 8x 8x 8x 8x 8x 203x 195x 188x 188x 195x 7x 7x 190x 190x 206x 4x 4x 206x 655x 655x 679x 25x 25x 25x 25x 25x 658x 628x 629x 1x 1x 1x 1x 1x 654x 654x 654x 679x 679x 679x 679x 679x 3x 3x 653x 1x 1x 1x 650x 621x 650x 650x 650x 650x 650x 650x 650x 650x 650x 650x 652x 650x 650x 612x 612x 612x 650x 650x 627x 627x 627x 650x 650x 650x 650x 650x 650x 650x 652x 6x 650x 650x 650x 1300x 650x 650x 650x 650x 650x 650x 650x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 679x 113x 113x 621x 621x 621x 621x 621x 621x 621x 621x 621x 239x 239x 239x 239x 620x 620x 621x 113x 113x 1x 1x 113x 113x 31x 31x 31x 31x 113x 113x 5644x 5644x 398x 398x 5644x 1x 5644x 31x 5644x 2656x 2656x 2656x 2656x 2664x 2656x 2656x 2656x 5644x 2557x 2557x 2557x 2557x 5644x 1x 1x 5644x 113x 113x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 621x 113x 113x 11075x 11074x 11074x 11075x 113x 113x 102x 102x 102x 102x 102x 2x 2x 2x 2x 2x 1x 1x 101x 101x 100x 100x 100x 100x 100x 100x 100x 100x 100x 102x 113x 113x 105x 102x 102x 102x 105x 113x 113x 6x 5x 5x 5x 6x 113x 113x 2616x 1373x 1373x 2616x 113x 113x 3x 3x 113x 113x 44x 44x 113x 113x 4x 4x 113x 113x 2x 1x 1x 2x 113x 113x 1x 1x 1x         1x 1x 113x 113x 1239x 1239x 1239x 1239x 1239x 1239x 1239x 1239x 1239x 1239x 1239x 113x 113x 654x 654x 654x 654x 10x 10x 12x 10x 12x 10x 12x 10x 10x 10x 654x 113x 392x 392x 392x 392x 392x 392x 392x 392x 113x 8x 8x 8x 8x 8x 8x 1x 1x 7x 7x 8x 1x 1x 1x 1x 7x 8x         7x 7x 7x 7x 7x 7x 7x 7x 7x 8x 3x 3x 4x 4x 4x 4x 4x 8x 113x 113x 7x 7x 7x 7x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x 113x  
'use strict';
 
/* global SharedArrayBuffer */
 
const {
  ArrayIsArray,
  ArrayPrototypeForEach,
  ArrayPrototypeMap,
  ArrayPrototypePush,
  Float64Array,
  FunctionPrototypeBind,
  JSONStringify,
  MathMax,
  ObjectCreate,
  ObjectEntries,
  Promise,
  PromiseResolve,
  ReflectApply,
  RegExpPrototypeTest,
  SafeArrayIterator,
  SafeMap,
  String,
  Symbol,
  SymbolFor,
  TypedArrayPrototypeFill,
  Uint32Array,
} = primordials;
 
const EventEmitter = require('events');
const assert = require('internal/assert');
const path = require('path');
const { timeOrigin } = internalBinding('performance');
 
const errorCodes = require('internal/errors').codes;
const {
  ERR_WORKER_NOT_RUNNING,
  ERR_WORKER_PATH,
  ERR_WORKER_UNSERIALIZABLE_ERROR,
  ERR_WORKER_UNSUPPORTED_EXTENSION,
  ERR_WORKER_INVALID_EXEC_ARGV,
  ERR_INVALID_ARG_TYPE,
  ERR_INVALID_ARG_VALUE,
} = errorCodes;
const { getOptionValue } = require('internal/options');
 
const workerIo = require('internal/worker/io');
const {
  drainMessagePort,
  MessageChannel,
  messageTypes,
  kPort,
  kIncrementsPortRef,
  kWaitingStreams,
  kStdioWantsMoreDataCallback,
  setupPortReferencing,
  ReadableWorkerStdio,
  WritableWorkerStdio
} = workerIo;
const { deserializeError } = require('internal/error_serdes');
const { fileURLToPath, isURLInstance, pathToFileURL } = require('internal/url');
const { validateArray } = require('internal/validators');
 
const {
  ownsProcessState,
  isMainThread,
  resourceLimits: resourceLimitsRaw,
  threadId,
  Worker: WorkerImpl,
  kMaxYoungGenerationSizeMb,
  kMaxOldGenerationSizeMb,
  kCodeRangeSizeMb,
  kStackSizeMb,
  kTotalResourceLimitCount
} = internalBinding('worker');
 
const kHandle = Symbol('kHandle');
const kPublicPort = Symbol('kPublicPort');
const kDispose = Symbol('kDispose');
const kOnExit = Symbol('kOnExit');
const kOnMessage = Symbol('kOnMessage');
const kOnCouldNotSerializeErr = Symbol('kOnCouldNotSerializeErr');
const kOnErrorMessage = Symbol('kOnErrorMessage');
const kParentSideStdio = Symbol('kParentSideStdio');
const kLoopStartTime = Symbol('kLoopStartTime');
const kIsOnline = Symbol('kIsOnline');
 
const SHARE_ENV = SymbolFor('nodejs.worker_threads.SHARE_ENV');
let debug = require('internal/util/debuglog').debuglog('worker', (fn) => {
  debug = fn;
});
 
let cwdCounter;
 
const environmentData = new SafeMap();
 
if (isMainThread) {
  cwdCounter = new Uint32Array(new SharedArrayBuffer(4));
  const originalChdir = process.chdir;
  process.chdir = function(path) {
    Atomics.add(cwdCounter, 0, 1);
    originalChdir(path);
  };
}
 
function setEnvironmentData(key, value) {
  if (value === undefined)
    environmentData.delete(key);
  else
    environmentData.set(key, value);
}
 
function getEnvironmentData(key) {
  return environmentData.get(key);
}
 
function assignEnvironmentData(data) {
  if (data === undefined) return;
  data.forEach((value, key) => {
    environmentData.set(key, value);
  });
}
 
class Worker extends EventEmitter {
  constructor(filename, options = {}) {
    super();
    debug(`[${threadId}] create new worker`, filename, options);
    if (options.execArgv && !ArrayIsArray(options.execArgv)) {
      throw new ERR_INVALID_ARG_TYPE('options.execArgv',
                                     'Array',
                                     options.execArgv);
    }
    let argv;
    if (options.argv) {
      validateArray(options.argv, 'options.argv');
      argv = ArrayPrototypeMap(options.argv, String);
    }
 
    let url, doEval;
    if (options.eval) {
      if (typeof filename !== 'string') {
        throw new ERR_INVALID_ARG_VALUE(
          'options.eval',
          options.eval,
          'must be false when \'filename\' is not a string'
        );
      }
      url = null;
      doEval = 'classic';
    } else if (isURLInstance(filename) && filename.protocol === 'data:') {
      url = null;
      doEval = 'module';
      filename = `import ${JSONStringify(`${filename}`)}`;
    } else {
      doEval = false;
      if (isURLInstance(filename)) {
        url = filename;
        filename = fileURLToPath(filename);
      } else if (typeof filename !== 'string') {
        throw new ERR_INVALID_ARG_TYPE(
          'filename',
          ['string', 'URL'],
          filename
        );
      } else if (path.isAbsolute(filename) ||
                 RegExpPrototypeTest(/^\.\.?[\\/]/, filename)) {
        filename = path.resolve(filename);
        url = pathToFileURL(filename);
      } else {
        throw new ERR_WORKER_PATH(filename);
      }
 
      const ext = path.extname(filename);
      if (ext !== '.js' && ext !== '.mjs' && ext !== '.cjs') {
        throw new ERR_WORKER_UNSUPPORTED_EXTENSION(ext);
      }
    }
 
    let env;
    if (typeof options.env === 'object' && options.env !== null) {
      env = ObjectCreate(null);
      ArrayPrototypeForEach(
        ObjectEntries(options.env),
        ({ 0: key, 1: value }) => { env[key] = `${value}`; }
      );
    } else if (options.env == null) {
      env = process.env;
    } else if (options.env !== SHARE_ENV) {
      throw new ERR_INVALID_ARG_TYPE(
        'options.env',
        ['object', 'undefined', 'null', 'worker_threads.SHARE_ENV'],
        options.env);
    }
 
    // Set up the C++ handle for the worker, as well as some internal wiring.
    this[kHandle] = new WorkerImpl(url,
                                   env === process.env ? null : env,
                                   options.execArgv,
                                   parseResourceLimits(options.resourceLimits),
                                   !!(options.trackUnmanagedFds ?? true));
    if (this[kHandle].invalidExecArgv) {
      throw new ERR_WORKER_INVALID_EXEC_ARGV(this[kHandle].invalidExecArgv);
    }
    if (this[kHandle].invalidNodeOptions) {
      throw new ERR_WORKER_INVALID_EXEC_ARGV(
        this[kHandle].invalidNodeOptions, 'invalid NODE_OPTIONS env variable');
    }
    this[kHandle].onexit = (code, customErr, customErrReason) => {
      this[kOnExit](code, customErr, customErrReason);
    };
    this[kPort] = this[kHandle].messagePort;
    this[kPort].on('message', (data) => this[kOnMessage](data));
    this[kPort].start();
    this[kPort].unref();
    this[kPort][kWaitingStreams] = 0;
    debug(`[${threadId}] created Worker with ID ${this.threadId}`);
 
    let stdin = null;
    if (options.stdin)
      stdin = new WritableWorkerStdio(this[kPort], 'stdin');
    const stdout = new ReadableWorkerStdio(this[kPort], 'stdout');
    if (!options.stdout) {
      stdout[kIncrementsPortRef] = false;
      pipeWithoutWarning(stdout, process.stdout);
    }
    const stderr = new ReadableWorkerStdio(this[kPort], 'stderr');
    if (!options.stderr) {
      stderr[kIncrementsPortRef] = false;
      pipeWithoutWarning(stderr, process.stderr);
    }
 
    this[kParentSideStdio] = { stdin, stdout, stderr };
 
    const { port1, port2 } = new MessageChannel();
    const transferList = [port2];
    // If transferList is provided.
    if (options.transferList)
      ArrayPrototypePush(transferList,
                         ...new SafeArrayIterator(options.transferList));
 
    this[kPublicPort] = port1;
    ArrayPrototypeForEach(['message', 'messageerror'], (event) => {
      this[kPublicPort].on(event, (message) => this.emit(event, message));
    });
    setupPortReferencing(this[kPublicPort], this, 'message');
    this[kPort].postMessage({
      argv,
      type: messageTypes.LOAD_SCRIPT,
      filename,
      doEval,
      cwdCounter: cwdCounter || workerIo.sharedCwdCounter,
      workerData: options.workerData,
      environmentData,
      publicPort: port2,
      manifestURL: getOptionValue('--experimental-policy') ?
        require('internal/process/policy').url :
        null,
      manifestSrc: getOptionValue('--experimental-policy') ?
        require('internal/process/policy').src :
        null,
      hasStdin: !!options.stdin
    }, transferList);
    // Use this to cache the Worker's loopStart value once available.
    this[kLoopStartTime] = -1;
    this[kIsOnline] = false;
    this.performance = {
      eventLoopUtilization: FunctionPrototypeBind(eventLoopUtilization, this),
    };
    // Actually start the new thread now that everything is in place.
    this[kHandle].startThread();
  }
 
  [kOnExit](code, customErr, customErrReason) {
    debug(`[${threadId}] hears end event for Worker ${this.threadId}`);
    drainMessagePort(this[kPublicPort]);
    drainMessagePort(this[kPort]);
    this.removeAllListeners('message');
    this.removeAllListeners('messageerrors');
    this[kPublicPort].unref();
    this[kPort].unref();
    this[kDispose]();
    if (customErr) {
      debug(`[${threadId}] failing with custom error ${customErr} \
        and with reason ${customErrReason}`);
      this.emit('error', new errorCodes[customErr](customErrReason));
    }
    this.emit('exit', code);
    this.removeAllListeners();
  }
 
  [kOnCouldNotSerializeErr]() {
    this.emit('error', new ERR_WORKER_UNSERIALIZABLE_ERROR());
  }
 
  [kOnErrorMessage](serialized) {
    // This is what is called for uncaught exceptions.
    const error = deserializeError(serialized);
    this.emit('error', error);
  }
 
  [kOnMessage](message) {
    switch (message.type) {
      case messageTypes.UP_AND_RUNNING:
        this[kIsOnline] = true;
        return this.emit('online');
      case messageTypes.COULD_NOT_SERIALIZE_ERROR:
        return this[kOnCouldNotSerializeErr]();
      case messageTypes.ERROR_MESSAGE:
        return this[kOnErrorMessage](message.error);
      case messageTypes.STDIO_PAYLOAD:
      {
        const { stream, chunks } = message;
        const readable = this[kParentSideStdio][stream];
        ArrayPrototypeForEach(chunks, ({ chunk, encoding }) => {
          readable.push(chunk, encoding);
        });
        return;
      }
      case messageTypes.STDIO_WANTS_MORE_DATA:
      {
        const { stream } = message;
        return this[kParentSideStdio][stream][kStdioWantsMoreDataCallback]();
      }
    }
 
    assert.fail(`Unknown worker message type ${message.type}`);
  }
 
  [kDispose]() {
    this[kHandle].onexit = null;
    this[kHandle] = null;
    this[kPort] = null;
    this[kPublicPort] = null;
 
    const { stdout, stderr } = this[kParentSideStdio];
 
    if (!stdout.readableEnded) {
      debug(`[${threadId}] explicitly closes stdout for ${this.threadId}`);
      stdout.push(null);
    }
    if (!stderr.readableEnded) {
      debug(`[${threadId}] explicitly closes stderr for ${this.threadId}`);
      stderr.push(null);
    }
  }
 
  postMessage(...args) {
    if (this[kPublicPort] === null) return;
 
    ReflectApply(this[kPublicPort].postMessage, this[kPublicPort], args);
  }
 
  terminate(callback) {
    debug(`[${threadId}] terminates Worker with ID ${this.threadId}`);
 
    this.ref();
 
    if (typeof callback === 'function') {
      process.emitWarning(
        'Passing a callback to worker.terminate() is deprecated. ' +
        'It returns a Promise instead.',
        'DeprecationWarning', 'DEP0132');
      if (this[kHandle] === null) return PromiseResolve();
      this.once('exit', (exitCode) => callback(null, exitCode));
    }
 
    if (this[kHandle] === null) return PromiseResolve();
 
    this[kHandle].stopThread();
 
    // Do not use events.once() here, because the 'exit' event will always be
    // emitted regardless of any errors, and the point is to only resolve
    // once the thread has actually stopped.
    return new Promise((resolve) => {
      this.once('exit', resolve);
    });
  }
 
  ref() {
    if (this[kHandle] === null) return;
 
    this[kHandle].ref();
    this[kPublicPort].ref();
  }
 
  unref() {
    if (this[kHandle] === null) return;
 
    this[kHandle].unref();
    this[kPublicPort].unref();
  }
 
  get threadId() {
    if (this[kHandle] === null) return -1;
 
    return this[kHandle].threadId;
  }
 
  get stdin() {
    return this[kParentSideStdio].stdin;
  }
 
  get stdout() {
    return this[kParentSideStdio].stdout;
  }
 
  get stderr() {
    return this[kParentSideStdio].stderr;
  }
 
  get resourceLimits() {
    if (this[kHandle] === null) return {};
 
    return makeResourceLimits(this[kHandle].getResourceLimits());
  }
 
  getHeapSnapshot() {
    const heapSnapshotTaker = this[kHandle] && this[kHandle].takeHeapSnapshot();
    return new Promise((resolve, reject) => {
      if (!heapSnapshotTaker) return reject(new ERR_WORKER_NOT_RUNNING());
      heapSnapshotTaker.ondone = (handle) => {
        const { HeapSnapshotStream } = require('internal/heap_utils');
        resolve(new HeapSnapshotStream(handle));
      };
    });
  }
}
 
function pipeWithoutWarning(source, dest) {
  const sourceMaxListeners = source._maxListeners;
  const destMaxListeners = dest._maxListeners;
  source.setMaxListeners(Infinity);
  dest.setMaxListeners(Infinity);
 
  source.pipe(dest);
 
  source._maxListeners = sourceMaxListeners;
  dest._maxListeners = destMaxListeners;
}
 
const resourceLimitsArray = new Float64Array(kTotalResourceLimitCount);
function parseResourceLimits(obj) {
  const ret = resourceLimitsArray;
  TypedArrayPrototypeFill(ret, -1);
  if (typeof obj !== 'object' || obj === null) return ret;
 
  if (typeof obj.maxOldGenerationSizeMb === 'number')
    ret[kMaxOldGenerationSizeMb] = MathMax(obj.maxOldGenerationSizeMb, 2);
  if (typeof obj.maxYoungGenerationSizeMb === 'number')
    ret[kMaxYoungGenerationSizeMb] = obj.maxYoungGenerationSizeMb;
  if (typeof obj.codeRangeSizeMb === 'number')
    ret[kCodeRangeSizeMb] = obj.codeRangeSizeMb;
  if (typeof obj.stackSizeMb === 'number')
    ret[kStackSizeMb] = obj.stackSizeMb;
  return ret;
}
 
function makeResourceLimits(float64arr) {
  return {
    maxYoungGenerationSizeMb: float64arr[kMaxYoungGenerationSizeMb],
    maxOldGenerationSizeMb: float64arr[kMaxOldGenerationSizeMb],
    codeRangeSizeMb: float64arr[kCodeRangeSizeMb],
    stackSizeMb: float64arr[kStackSizeMb]
  };
}
 
function eventLoopUtilization(util1, util2) {
  // TODO(trevnorris): Works to solve the thread-safe read/write issue of
  // loopTime, but has the drawback that it can't be set until the event loop
  // has had a chance to turn. So it will be impossible to read the ELU of
  // a worker thread immediately after it's been created.
  if (!this[kIsOnline] || !this[kHandle]) {
    return { idle: 0, active: 0, utilization: 0 };
  }
 
  // Cache loopStart, since it's only written to once.
  if (this[kLoopStartTime] === -1) {
    this[kLoopStartTime] = this[kHandle].loopStartTime();
    if (this[kLoopStartTime] === -1)
      return { idle: 0, active: 0, utilization: 0 };
  }
 
  if (util2) {
    const idle = util1.idle - util2.idle;
    const active = util1.active - util2.active;
    return { idle, active, utilization: active / (idle + active) };
  }
 
  const idle = this[kHandle].loopIdleTime();
 
  // Using performance.now() here is fine since it's always the time from
  // the beginning of the process, and is why it needs to be offset by the
  // loopStart time (which is also calculated from the beginning of the
  // process).
  const active = now() - this[kLoopStartTime] - idle;
 
  if (!util1) {
    return { idle, active, utilization: active / (idle + active) };
  }
 
  const idle_delta = idle - util1.idle;
  const active_delta = active - util1.active;
  const utilization = active_delta / (idle_delta + active_delta);
  return { idle: idle_delta, active: active_delta, utilization };
}
 
// Duplicate code from performance.now() so don't need to require perf_hooks.
function now() {
  const hr = process.hrtime();
  return (hr[0] * 1000 + hr[1] / 1e6) - timeOrigin;
}
 
module.exports = {
  ownsProcessState,
  isMainThread,
  SHARE_ENV,
  resourceLimits:
    !isMainThread ? makeResourceLimits(resourceLimitsRaw) : {},
  setEnvironmentData,
  getEnvironmentData,
  assignEnvironmentData,
  threadId,
  Worker,
};