All files / lib/internal/worker io.js

96.49% Statements 495/513
97.92% Branches 94/96
100% Functions 34/34
96.49% Lines 495/513

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 51429x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 23x 23x 23x 23x 29x 129x 129x 129x 29x 29x 29x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 106x 103x 106x 106x 29x 29x 29x 29x 29x 98x 98x 97x 29x 29x 29x 29x 29x 29x 29x 7x 7x 6x 29x 29x 29x 29x 29x 29x 29x 7x 7x 6x 29x 29x 29x 29x 29x 29x 29x 7x 7x 6x 29x 29x 29x 29x 29x 29x 29x 10x 10x 9x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 72x 1x 1x 71x 71x 71x 29x 29x 29x 29x 29x 29x 29x 33759x 33759x 33759x 33759x 33759x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 32549x 32549x 29x 29x 29x 32549x 32549x 32549x 29x 29x 29x 29x 29x 29x 29x 29x 10128x 10128x 10128x 29x 29x 29x 29x 29x 29x 18x 18x 18x 18x 18x 18x 9x 18x 2x 18x 7x 7x 18x 18x 18x 29x 29x 34552x 34552x 34552x 34552x 34552x 34552x 34552x 2358x 34552x 34552x 2316x 34552x 34552x 34552x 43207x 43207x 34552x 34552x 34552x 40133x 40133x 34552x 34552x 34552x 22896x 22896x 22896x 22896x 22896x 34552x 34552x 20670x 20670x 20670x 20670x 20670x 34552x 29x 29x 29x 29x 2127x 2127x 2127x 2127x 2127x 2127x 1501x 37x 37x 37x 2127x 2127x 29x 29x 6978x 37x 37x 37x 37x 6978x 6978x 6978x 6978x 6978x 6978x 29x 29x 29x 29x 1084x 1084x 1084x 1084x 1084x 29x 29x 5446x 5446x 5446x 5446x 5446x 5446x 5446x 5446x 5446x 5446x 29x 29x 1x 1x 1x 1x 1x 1x 1x 29x 29x 6173x 6173x 6173x 6173x 6173x 6173x 29x 29x 541x 541x 541x 541x 541x 541x 541x 541x 541x 29x 13x 13x 13x 4x 13x 29x 23x 23x 23x 29x 84x 84x 84x 29x 29x 29x 43x 43x 42x 42x 42x 42x 42x 42x 42x 42x 42x 43x 29x 29x                               29x 29x 16x 16x 15x 16x 29x 29x 38x 38x 37x 38x 36x 36x 36x 36x 36x 36x 38x 29x 29x 23x 23x 22x 23x 21x 23x 19x 23x 23x 29x 29x 29x 29x 29x 29x 1x 1x       1x 29x 29x 29x 29x 29x 29x 6x 6x 5x 5x 5x 6x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x 29x  
'use strict';
 
const {
  ArrayPrototypeForEach,
  ArrayPrototypeMap,
  ArrayPrototypePush,
  FunctionPrototypeBind,
  FunctionPrototypeCall,
  ObjectAssign,
  ObjectCreate,
  ObjectDefineProperty,
  ObjectDefineProperties,
  ObjectGetOwnPropertyDescriptors,
  ObjectGetPrototypeOf,
  ObjectSetPrototypeOf,
  ReflectApply,
  Symbol,
  SymbolFor,
} = primordials;
 
const {
  handle_onclose: handleOnCloseSymbol,
  oninit: onInitSymbol,
  no_message_symbol: noMessageSymbol
} = internalBinding('symbols');
const {
  MessagePort,
  MessageChannel,
  broadcastChannel,
  drainMessagePort,
  moveMessagePortToContext,
  receiveMessageOnPort: receiveMessageOnPort_,
  stopMessagePort,
  checkMessagePort,
  DOMException,
} = internalBinding('messaging');
const {
  getEnvMessagePort
} = internalBinding('worker');
 
const { Readable, Writable } = require('stream');
const {
  Event,
  EventTarget,
  NodeEventTarget,
  defineEventHandler,
  initNodeEventTarget,
  kCreateEvent,
  kNewListener,
  kRemoveListener,
} = require('internal/event_target');
const { inspect } = require('internal/util/inspect');
const {
  codes: {
    ERR_INVALID_ARG_TYPE,
    ERR_INVALID_THIS,
    ERR_MISSING_ARGS,
  }
} = require('internal/errors');
 
const kData = Symbol('kData');
const kHandle = Symbol('kHandle');
const kIncrementsPortRef = Symbol('kIncrementsPortRef');
const kLastEventId = Symbol('kLastEventId');
const kName = Symbol('kName');
const kOrigin = Symbol('kOrigin');
const kOnMessage = Symbol('kOnMessage');
const kOnMessageError = Symbol('kOnMessageError');
const kPort = Symbol('kPort');
const kPorts = Symbol('kPorts');
const kWaitingStreams = Symbol('kWaitingStreams');
const kWritableCallbacks = Symbol('kWritableCallbacks');
const kSource = Symbol('kSource');
const kStartedReading = Symbol('kStartedReading');
const kStdioWantsMoreDataCallback = Symbol('kStdioWantsMoreDataCallback');
const kCurrentlyReceivingPorts =
  SymbolFor('nodejs.internal.kCurrentlyReceivingPorts');
const kType = Symbol('kType');
 
const messageTypes = {
  UP_AND_RUNNING: 'upAndRunning',
  COULD_NOT_SERIALIZE_ERROR: 'couldNotSerializeError',
  ERROR_MESSAGE: 'errorMessage',
  STDIO_PAYLOAD: 'stdioPayload',
  STDIO_WANTS_MORE_DATA: 'stdioWantsMoreData',
  LOAD_SCRIPT: 'loadScript'
};
 
// We have to mess with the MessagePort prototype a bit, so that a) we can make
// it inherit from NodeEventTarget, even though it is a C++ class, and b) we do
// not provide methods that are not present in the Browser and not documented
// on our side (e.g. hasRef).
// Save a copy of the original set of methods as a shallow clone.
const MessagePortPrototype = ObjectCreate(
  ObjectGetPrototypeOf(MessagePort.prototype),
  ObjectGetOwnPropertyDescriptors(MessagePort.prototype));
// Set up the new inheritance chain.
ObjectSetPrototypeOf(MessagePort, NodeEventTarget);
ObjectSetPrototypeOf(MessagePort.prototype, NodeEventTarget.prototype);
// Copy methods that are inherited from HandleWrap, because
// changing the prototype of MessagePort.prototype implicitly removed them.
MessagePort.prototype.ref = MessagePortPrototype.ref;
MessagePort.prototype.unref = MessagePortPrototype.unref;
 
function validateMessagePort(port, name) {
  if (!checkMessagePort(port))
    throw new ERR_INVALID_ARG_TYPE(name, 'MessagePort', port);
}
 
function isMessageEvent(value) {
  return value != null && kData in value;
}
 
class MessageEvent extends Event {
  constructor(type, {
    data = null,
    origin = '',
    lastEventId = '',
    source = null,
    ports = [],
  } = {}) {
    super(type);
    this[kData] = data;
    this[kOrigin] = `${origin}`;
    this[kLastEventId] = `${lastEventId}`;
    this[kSource] = source;
    this[kPorts] = [...ports];
 
    if (this[kSource] !== null)
      validateMessagePort(this[kSource], 'init.source');
    for (let i = 0; i < this[kPorts].length; i++)
      validateMessagePort(this[kPorts][i], `init.ports[${i}]`);
  }
}
 
ObjectDefineProperties(MessageEvent.prototype, {
  data: {
    get() {
      if (!isMessageEvent(this))
        throw new ERR_INVALID_THIS('MessageEvent');
      return this[kData];
    },
    enumerable: true,
    configurable: true,
    set: undefined,
  },
  origin: {
    get() {
      if (!isMessageEvent(this))
        throw new ERR_INVALID_THIS('MessageEvent');
      return this[kOrigin];
    },
    enumerable: true,
    configurable: true,
    set: undefined,
  },
  lastEventId: {
    get() {
      if (!isMessageEvent(this))
        throw new ERR_INVALID_THIS('MessageEvent');
      return this[kLastEventId];
    },
    enumerable: true,
    configurable: true,
    set: undefined,
  },
  source: {
    get() {
      if (!isMessageEvent(this))
        throw new ERR_INVALID_THIS('MessageEvent');
      return this[kSource];
    },
    enumerable: true,
    configurable: true,
    set: undefined,
  },
  ports: {
    get() {
      if (!isMessageEvent(this))
        throw new ERR_INVALID_THIS('MessageEvent');
      return this[kPorts];
    },
    enumerable: true,
    configurable: true,
    set: undefined,
  },
});
 
const originalCreateEvent = EventTarget.prototype[kCreateEvent];
ObjectDefineProperty(
  MessagePort.prototype,
  kCreateEvent,
  {
    value: function(data, type) {
      if (type !== 'message' && type !== 'messageerror') {
        return ReflectApply(originalCreateEvent, this, arguments);
      }
      const ports = this[kCurrentlyReceivingPorts];
      this[kCurrentlyReceivingPorts] = undefined;
      return new MessageEvent(type, { data, ports });
    },
    configurable: false,
    writable: false,
    enumerable: false,
  });
 
// This is called from inside the `MessagePort` constructor.
function oninit() {
  initNodeEventTarget(this);
  setupPortReferencing(this, this, 'message');
  this[kCurrentlyReceivingPorts] = undefined;
}
 
defineEventHandler(MessagePort.prototype, 'message');
defineEventHandler(MessagePort.prototype, 'messageerror');
 
ObjectDefineProperty(MessagePort.prototype, onInitSymbol, {
  enumerable: true,
  writable: false,
  value: oninit
});
 
class MessagePortCloseEvent extends Event {
  constructor() {
    super('close');
  }
}
 
// This is called after the underlying `uv_async_t` has been closed.
function onclose() {
  this.dispatchEvent(new MessagePortCloseEvent());
}
 
ObjectDefineProperty(MessagePort.prototype, handleOnCloseSymbol, {
  enumerable: false,
  writable: false,
  value: onclose
});
 
MessagePort.prototype.close = function(cb) {
  if (typeof cb === 'function')
    this.once('close', cb);
  FunctionPrototypeCall(MessagePortPrototype.close, this);
};
 
ObjectDefineProperty(MessagePort.prototype, inspect.custom, {
  enumerable: false,
  writable: false,
  value: function inspect() {  // eslint-disable-line func-name-matching
    let ref;
    try {
      // This may throw when `this` does not refer to a native object,
      // e.g. when accessing the prototype directly.
      ref = FunctionPrototypeCall(MessagePortPrototype.hasRef, this);
    } catch { return this; }
    return ObjectAssign(ObjectCreate(MessagePort.prototype),
                        ref === undefined ? {
                          active: false,
                        } : {
                          active: true,
                          refed: ref
                        },
                        this);
  }
});
 
function setupPortReferencing(port, eventEmitter, eventName) {
  // Keep track of whether there are any workerMessage listeners:
  // If there are some, ref() the channel so it keeps the event loop alive.
  // If there are none or all are removed, unref() the channel so the worker
  // can shutdown gracefully.
  port.unref();
  eventEmitter.on('newListener', function(name) {
    if (name === eventName) newListener(eventEmitter.listenerCount(name));
  });
  eventEmitter.on('removeListener', function(name) {
    if (name === eventName) removeListener(eventEmitter.listenerCount(name));
  });
  const origNewListener = eventEmitter[kNewListener];
  eventEmitter[kNewListener] = function(size, type, ...args) {
    if (type === eventName) newListener(size - 1);
    return ReflectApply(origNewListener, this, arguments);
  };
  const origRemoveListener = eventEmitter[kRemoveListener];
  eventEmitter[kRemoveListener] = function(size, type, ...args) {
    if (type === eventName) removeListener(size);
    return ReflectApply(origRemoveListener, this, arguments);
  };
 
  function newListener(size) {
    if (size === 0) {
      port.ref();
      FunctionPrototypeCall(MessagePortPrototype.start, port);
    }
  }
 
  function removeListener(size) {
    if (size === 0) {
      stopMessagePort(port);
      port.unref();
    }
  }
}
 
 
class ReadableWorkerStdio extends Readable {
  constructor(port, name) {
    super();
    this[kPort] = port;
    this[kName] = name;
    this[kIncrementsPortRef] = true;
    this[kStartedReading] = false;
    this.on('end', () => {
      if (this[kStartedReading] && this[kIncrementsPortRef]) {
        if (--this[kPort][kWaitingStreams] === 0)
          this[kPort].unref();
      }
    });
  }
 
  _read() {
    if (!this[kStartedReading] && this[kIncrementsPortRef]) {
      this[kStartedReading] = true;
      if (this[kPort][kWaitingStreams]++ === 0)
        this[kPort].ref();
    }
 
    this[kPort].postMessage({
      type: messageTypes.STDIO_WANTS_MORE_DATA,
      stream: this[kName]
    });
  }
}
 
class WritableWorkerStdio extends Writable {
  constructor(port, name) {
    super({ decodeStrings: false });
    this[kPort] = port;
    this[kName] = name;
    this[kWritableCallbacks] = [];
  }
 
  _writev(chunks, cb) {
    this[kPort].postMessage({
      type: messageTypes.STDIO_PAYLOAD,
      stream: this[kName],
      chunks: ArrayPrototypeMap(chunks,
                                ({ chunk, encoding }) => ({ chunk, encoding })),
    });
    ArrayPrototypePush(this[kWritableCallbacks], cb);
    if (this[kPort][kWaitingStreams]++ === 0)
      this[kPort].ref();
  }
 
  _final(cb) {
    this[kPort].postMessage({
      type: messageTypes.STDIO_PAYLOAD,
      stream: this[kName],
      chunks: [ { chunk: null, encoding: '' } ]
    });
    cb();
  }
 
  [kStdioWantsMoreDataCallback]() {
    const cbs = this[kWritableCallbacks];
    this[kWritableCallbacks] = [];
    ArrayPrototypeForEach(cbs, (cb) => cb());
    if ((this[kPort][kWaitingStreams] -= cbs.length) === 0)
      this[kPort].unref();
  }
}
 
function createWorkerStdio() {
  const port = getEnvMessagePort();
  port[kWaitingStreams] = 0;
  return {
    stdin: new ReadableWorkerStdio(port, 'stdin'),
    stdout: new WritableWorkerStdio(port, 'stdout'),
    stderr: new WritableWorkerStdio(port, 'stderr')
  };
}
 
function receiveMessageOnPort(port) {
  const message = receiveMessageOnPort_(port?.[kHandle] ?? port);
  if (message === noMessageSymbol) return undefined;
  return { message };
}
 
function onMessageEvent(type, data) {
  this.dispatchEvent(new MessageEvent(type, { data }));
}
 
function isBroadcastChannel(value) {
  return value?.[kType] === 'BroadcastChannel';
}
 
class BroadcastChannel extends EventTarget {
  constructor(name) {
    if (arguments.length === 0)
      throw new ERR_MISSING_ARGS('name');
    super();
    this[kType] = 'BroadcastChannel';
    this[kName] = `${name}`;
    this[kHandle] = broadcastChannel(this[kName]);
    this[kOnMessage] = FunctionPrototypeBind(onMessageEvent, this, 'message');
    this[kOnMessageError] =
      FunctionPrototypeBind(onMessageEvent, this, 'messageerror');
    this[kHandle].on('message', this[kOnMessage]);
    this[kHandle].on('messageerror', this[kOnMessageError]);
  }
 
  [inspect.custom](depth, options) {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    if (depth < 0)
      return 'BroadcastChannel';

    const opts = {
      ...options,
      depth: options.depth == null ? null : options.depth - 1
    };

    return `BroadcastChannel ${inspect({
      name: this[kName],
      active: this[kHandle] !== undefined,
    }, opts)}`;
  }
 
  get name() {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    return this[kName];
  }
 
  close() {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    if (this[kHandle] === undefined)
      return;
    this[kHandle].off('message', this[kOnMessage]);
    this[kHandle].off('messageerror', this[kOnMessageError]);
    this[kOnMessage] = undefined;
    this[kOnMessageError] = undefined;
    this[kHandle].close();
    this[kHandle] = undefined;
  }
 
  postMessage(message) {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    if (arguments.length === 0)
      throw new ERR_MISSING_ARGS('message');
    if (this[kHandle] === undefined)
      throw new DOMException('BroadcastChannel is closed.');
    if (this[kHandle].postMessage(message) === undefined)
      throw new DOMException('Message could not be posted.');
  }
 
  // The ref() method is Node.js specific and not part of the standard
  // BroadcastChannel API definition. Typically we shouldn't extend Web
  // Platform APIs with Node.js specific methods but ref and unref
  // are a bit special.
  ref() {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    if (this[kHandle])
      this[kHandle].ref();
    return this;
  }
 
  // The unref() method is Node.js specific and not part of the standard
  // BroadcastChannel API definition. Typically we shouldn't extend Web
  // Platform APIs with Node.js specific methods but ref and unref
  // are a bit special.
  unref() {
    if (!isBroadcastChannel(this))
      throw new ERR_INVALID_THIS('BroadcastChannel');
    if (this[kHandle])
      this[kHandle].unref();
    return this;
  }
}
 
const kEnumerableProperty = ObjectCreate(null);
kEnumerableProperty.enumerable = true;
 
ObjectDefineProperties(BroadcastChannel.prototype, {
  name: kEnumerableProperty,
  close: kEnumerableProperty,
  postMessage: kEnumerableProperty,
});
 
defineEventHandler(BroadcastChannel.prototype, 'message');
defineEventHandler(BroadcastChannel.prototype, 'messageerror');
 
module.exports = {
  drainMessagePort,
  messageTypes,
  kPort,
  kIncrementsPortRef,
  kWaitingStreams,
  kStdioWantsMoreDataCallback,
  moveMessagePortToContext,
  MessagePort,
  MessageChannel,
  MessageEvent,
  receiveMessageOnPort,
  setupPortReferencing,
  ReadableWorkerStdio,
  WritableWorkerStdio,
  createWorkerStdio,
  BroadcastChannel,
};