All files / lib/internal/perf observe.js

91.6% Statements 458/500
96.09% Branches 123/128
100% Functions 21/21
91.6% Lines 458/500

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 50133x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 33x 173x 173x 91x 91x 90x 90x 90x 90x 90x 91x 173x 33x 26178x 26178x 26178x 26178x 26178x 26178x 26178x 33x 80x 80x 44x 44x 44x 6x 6x 6x 6x 3x 3x 3x 6x 44x 80x 33x 64x 64x 64x 64x 10x 10x 10x 4x 4x 4x 10x 64x 33x 33x 33x 97x 193x 193x 45x 97x 97x 33x 33x 89x 89x 33x 33x 6x 6x 6x 6x 6x 33x 33x 12x 12x 4x 4x 4x 4x 8x 8x 8x 12x 33x 33x                   33x 33x 33x 33x 65x 65x 65x 65x 65x 65x 65x 65x 65x 33x 33x 85x 85x 85x 85x 85x 85x 85x 85x 85x 85x 1x 1x 1x 80x 80x 85x 59x 59x 59x 85x 11x 11x 1x 1x 10x 85x 10x 10x 1x 1x 9x 85x 78x 83x 46x 5x 5x 5x 5x 5x 41x 41x 46x 54x 42x 42x 42x 54x 85x 32x 32x 22x 22x 24x 7x 7x 7x 7x 7x 7x 32x 63x 63x 72x 5x 5x 85x 33x 33x 39x 39x 39x 39x 39x 39x 39x 33x 33x 102x 102x 102x 102x 33x 33x 12x 12x 33x 33x 184x 184x 166x 166x 166x 166x 184x 33x 33x 97x 97x 97x 33x 33x                             33x 33x 319x 319x 319x 319x 319x 184x 184x 319x 319x 319x 319x 198x 287x 79x 121x 42x 42x 277x 277x 277x 277x 76x 76x 76x 76x 201x 201x 201x 277x 319x                           319x 33x 38x 38x 38x 23x 29x 15x 15x     38x 32x 32x 32x 6x 6x 6x 6x 10x 8x 6x 6x 6x 6x 2x 2x 2x       6x 6x 6x 38x 33x 65x 65x 65x 15x 64x 6x 50x 7x 7x 44x 37x 37x 58x 58x 65x 33x 95x 95x 95x 155x 140x 140x 155x 95x 95x 33x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 16x 113x 113x 113x 113x 113x 113x 20x 113x 113x   113x 113x 113x 113x 113x 16x 16x 16x 33x 33x 33x 26070x 26070x 26070x 26070x 33x 1130x 1130x 1130x 1130x 1130x 1130x 1130x 33x 32x 32x 32x 32x 32x 33x 33x 33x 33x 33x 33x 33x 33x 33x  
'use strict';
 
const {
  ArrayFrom,
  ArrayIsArray,
  ArrayPrototypeFilter,
  ArrayPrototypeFlatMap,
  ArrayPrototypeIncludes,
  ArrayPrototypePush,
  ArrayPrototypePushApply,
  ArrayPrototypeSlice,
  ArrayPrototypeSort,
  Error,
  ObjectDefineProperties,
  ObjectFreeze,
  ObjectKeys,
  SafeMap,
  SafeSet,
  Symbol,
} = primordials;
 
const {
  constants: {
    NODE_PERFORMANCE_ENTRY_TYPE_GC,
    NODE_PERFORMANCE_ENTRY_TYPE_HTTP2,
    NODE_PERFORMANCE_ENTRY_TYPE_HTTP,
  },
  installGarbageCollectionTracking,
  observerCounts,
  removeGarbageCollectionTracking,
  setupObservers,
} = internalBinding('performance');
 
const {
  InternalPerformanceEntry,
  isPerformanceEntry,
  kBufferNext,
} = require('internal/perf/performance_entry');
 
const {
  codes: {
    ERR_INVALID_ARG_VALUE,
    ERR_INVALID_ARG_TYPE,
    ERR_MISSING_ARGS,
  },
} = require('internal/errors');
 
const {
  validateCallback,
  validateObject,
} = require('internal/validators');
 
const {
  customInspectSymbol: kInspect,
  deprecate,
  lazyDOMException,
} = require('internal/util');
 
const {
  setImmediate,
} = require('timers');
 
const { inspect } = require('util');
 
const kBuffer = Symbol('kBuffer');
const kCallback = Symbol('kCallback');
const kDispatch = Symbol('kDispatch');
const kEntryTypes = Symbol('kEntryTypes');
const kMaybeBuffer = Symbol('kMaybeBuffer');
const kDeprecatedFields = Symbol('kDeprecatedFields');
const kType = Symbol('kType');
 
const kDeprecationMessage =
  'Custom PerformanceEntry accessors are deprecated. ' +
  'Please use the detail property.';
 
const kTypeSingle = 0;
const kTypeMultiple = 1;
 
let gcTrackingInstalled = false;
 
const kSupportedEntryTypes = ObjectFreeze([
  'function',
  'gc',
  'http',
  'http2',
  'mark',
  'measure',
]);
 
// Performance timeline entry Buffers
const markEntryBuffer = createBuffer();
const measureEntryBuffer = createBuffer();
const kMaxPerformanceEntryBuffers = 1e6;
const kClearPerformanceEntryBuffers = ObjectFreeze({
  'mark': 'performance.clearMarks',
  'measure': 'performance.clearMeasures',
});
const kWarnedEntryTypes = new SafeMap();
 
const kObservers = new SafeSet();
const kPending = new SafeSet();
let isPending = false;
 
function queuePending() {
  if (isPending) return;
  isPending = true;
  setImmediate(() => {
    isPending = false;
    const pendings = ArrayFrom(kPending.values());
    kPending.clear();
    for (const pending of pendings)
      pending[kDispatch]();
  });
}
 
function getObserverType(type) {
  switch (type) {
    case 'gc': return NODE_PERFORMANCE_ENTRY_TYPE_GC;
    case 'http2': return NODE_PERFORMANCE_ENTRY_TYPE_HTTP2;
    case 'http': return NODE_PERFORMANCE_ENTRY_TYPE_HTTP;
  }
}
 
function maybeDecrementObserverCounts(entryTypes) {
  for (const type of entryTypes) {
    const observerType = getObserverType(type);
 
    if (observerType !== undefined) {
      observerCounts[observerType]--;
 
      if (observerType === NODE_PERFORMANCE_ENTRY_TYPE_GC &&
          observerCounts[observerType] === 0) {
        removeGarbageCollectionTracking();
        gcTrackingInstalled = false;
      }
    }
  }
}
 
function maybeIncrementObserverCount(type) {
  const observerType = getObserverType(type);
 
  if (observerType !== undefined) {
    observerCounts[observerType]++;
    if (!gcTrackingInstalled &&
        observerType === NODE_PERFORMANCE_ENTRY_TYPE_GC) {
      installGarbageCollectionTracking();
      gcTrackingInstalled = true;
    }
  }
}
 
class PerformanceObserverEntryList {
  constructor(entries) {
    this[kBuffer] = ArrayPrototypeSort(entries, (first, second) => {
      if (first.startTime < second.startTime) return -1;
      if (first.startTime > second.startTime) return 1;
      return 0;
    });
  }
 
  getEntries() {
    return ArrayPrototypeSlice(this[kBuffer]);
  }
 
  getEntriesByType(type) {
    type = `${type}`;
    return ArrayPrototypeFilter(
      this[kBuffer],
      (entry) => entry.entryType === type);
  }
 
  getEntriesByName(name, type) {
    name = `${name}`;
    if (type != null /** not nullish */) {
      return ArrayPrototypeFilter(
        this[kBuffer],
        (entry) => entry.name === name && entry.entryType === type);
    }
    return ArrayPrototypeFilter(
      this[kBuffer],
      (entry) => entry.name === name);
  }
 
  [kInspect](depth, options) {
    if (depth < 0) return this;

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

    return `PerformanceObserverEntryList ${inspect(this[kBuffer], opts)}`;
  }
}
 
class PerformanceObserver {
  constructor(callback) {
    // TODO(joyeecheung): V8 snapshot does not support instance member
    // initializers for now:
    // https://bugs.chromium.org/p/v8/issues/detail?id=10704
    this[kBuffer] = [];
    this[kEntryTypes] = new SafeSet();
    this[kType] = undefined;
    validateCallback(callback);
    this[kCallback] = callback;
  }
 
  observe(options = {}) {
    validateObject(options, 'options');
    const {
      entryTypes,
      type,
      buffered,
    } = { ...options };
    if (entryTypes === undefined && type === undefined)
      throw new ERR_MISSING_ARGS('options.entryTypes', 'options.type');
    if (entryTypes != null && type != null)
      throw new ERR_INVALID_ARG_VALUE('options.entryTypes',
                                      entryTypes,
                                      'options.entryTypes can not set with ' +
                                      'options.type together');
 
    switch (this[kType]) {
      case undefined:
        if (entryTypes !== undefined) this[kType] = kTypeMultiple;
        if (type !== undefined) this[kType] = kTypeSingle;
        break;
      case kTypeSingle:
        if (entryTypes !== undefined)
          throw lazyDOMException(
            'PerformanceObserver can not change to multiple observations',
            'InvalidModificationError');
        break;
      case kTypeMultiple:
        if (type !== undefined)
          throw lazyDOMException(
            'PerformanceObserver can not change to single observation',
            'InvalidModificationError');
        break;
    }
 
    if (this[kType] === kTypeMultiple) {
      if (!ArrayIsArray(entryTypes)) {
        throw new ERR_INVALID_ARG_TYPE(
          'options.entryTypes',
          'string[]',
          entryTypes);
      }
      maybeDecrementObserverCounts(this[kEntryTypes]);
      this[kEntryTypes].clear();
      for (let n = 0; n < entryTypes.length; n++) {
        if (ArrayPrototypeIncludes(kSupportedEntryTypes, entryTypes[n])) {
          this[kEntryTypes].add(entryTypes[n]);
          maybeIncrementObserverCount(entryTypes[n]);
        }
      }
    } else {
      if (!ArrayPrototypeIncludes(kSupportedEntryTypes, type))
        return;
      this[kEntryTypes].add(type);
      maybeIncrementObserverCount(type);
      if (buffered) {
        const entries = filterBufferMapByNameAndType(undefined, type);
        ArrayPrototypePushApply(this[kBuffer], entries);
        kPending.add(this);
        if (kPending.size)
          queuePending();
      }
    }
 
    if (this[kEntryTypes].size)
      kObservers.add(this);
    else
      this.disconnect();
  }
 
  disconnect() {
    maybeDecrementObserverCounts(this[kEntryTypes]);
    kObservers.delete(this);
    kPending.delete(this);
    this[kBuffer] = [];
    this[kEntryTypes].clear();
    this[kType] = undefined;
  }
 
  takeRecords() {
    const list = this[kBuffer];
    this[kBuffer] = [];
    return list;
  }
 
  static get supportedEntryTypes() {
    return kSupportedEntryTypes;
  }
 
  [kMaybeBuffer](entry) {
    if (!this[kEntryTypes].has(entry.entryType))
      return;
    ArrayPrototypePush(this[kBuffer], entry);
    kPending.add(this);
    if (kPending.size)
      queuePending();
  }
 
  [kDispatch]() {
    this[kCallback](new PerformanceObserverEntryList(this.takeRecords()),
                    this);
  }
 
  [kInspect](depth, options) {
    if (depth < 0) return this;

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

    return `PerformanceObserver ${inspect({
      connected: kObservers.has(this),
      pending: kPending.has(this),
      entryTypes: ArrayFrom(this[kEntryTypes]),
      buffer: this[kBuffer],
    }, opts)}`;
  }
}
 
function enqueue(entry) {
  if (!isPerformanceEntry(entry))
    throw new ERR_INVALID_ARG_TYPE('entry', 'PerformanceEntry', entry);
 
  for (const obs of kObservers) {
    obs[kMaybeBuffer](entry);
  }
 
  const entryType = entry.entryType;
  let buffer;
  if (entryType === 'mark') {
    buffer = markEntryBuffer;
  } else if (entryType === 'measure') {
    buffer = measureEntryBuffer;
  } else {
    return;
  }
 
  const count = buffer.count + 1;
  buffer.count = count;
  if (count === 1) {
    buffer.head = entry;
    buffer.tail = entry;
    return;
  }
  buffer.tail[kBufferNext] = entry;
  buffer.tail = entry;
 
  if (count > kMaxPerformanceEntryBuffers &&
    !kWarnedEntryTypes.has(entryType)) {
    kWarnedEntryTypes.set(entryType, true);
    // No error code for this since it is a Warning
    // eslint-disable-next-line no-restricted-syntax
    const w = new Error('Possible perf_hooks memory leak detected. ' +
                        `${count} ${entryType} entries added to the global ` +
                        'performance entry buffer. Use ' +
                        `${kClearPerformanceEntryBuffers[entryType]} to ` +
                        'clear the buffer.');
    w.name = 'MaxPerformanceEntryBufferExceededWarning';
    w.entryType = entryType;
    w.count = count;
    process.emitWarning(w);
  }
}
 
function clearEntriesFromBuffer(type, name) {
  let buffer;
  if (type === 'mark') {
    buffer = markEntryBuffer;
  } else if (type === 'measure') {
    buffer = measureEntryBuffer;
  } else {
    return;
  }
  if (name === undefined) {
    resetBuffer(buffer);
    return;
  }
 
  let head = null;
  let tail = null;
  let count = 0;
  for (let entry = buffer.head; entry !== null; entry = entry[kBufferNext]) {
    if (entry.name !== name) {
      head = head ?? entry;
      tail = entry;
      continue;
    }
    if (tail === null) {
      continue;
    }
    tail[kBufferNext] = entry[kBufferNext];
    count++;
  }
  buffer.head = head;
  buffer.tail = tail;
  buffer.count = count;
}
 
function filterBufferMapByNameAndType(name, type) {
  let bufferList;
  if (type === 'mark') {
    bufferList = [markEntryBuffer];
  } else if (type === 'measure') {
    bufferList = [measureEntryBuffer];
  } else if (type !== undefined) {
    // Unrecognized type;
    return [];
  } else {
    bufferList = [markEntryBuffer, measureEntryBuffer];
  }
  return ArrayPrototypeFlatMap(bufferList,
                               (buffer) => filterBufferByName(buffer, name));
}
 
function filterBufferByName(buffer, name) {
  const arr = [];
  for (let entry = buffer.head; entry !== null; entry = entry[kBufferNext]) {
    if (name === undefined || entry.name === name) {
      ArrayPrototypePush(arr, entry);
    }
  }
  return arr;
}
 
function observerCallback(name, type, startTime, duration, details) {
  const entry =
    new InternalPerformanceEntry(
      name,
      type,
      startTime,
      duration,
      details);
 
  if (details !== undefined) {
    // GC, HTTP2, and HTTP PerformanceEntry used additional
    // properties directly off the entry. Those have been
    // moved into the details property. The existing accessors
    // are still included but are deprecated.
    entry[kDeprecatedFields] = new SafeMap();
 
    const detailKeys = ObjectKeys(details);
    const props = {};
    for (let n = 0; n < detailKeys.length; n++) {
      const key = detailKeys[n];
      entry[kDeprecatedFields].set(key, details[key]);
      props[key] = {
        configurable: true,
        enumerable: true,
        get: deprecate(() => {
          return entry[kDeprecatedFields].get(key);
        }, kDeprecationMessage, 'DEP0152'),
        set: deprecate((value) => {
          entry[kDeprecatedFields].set(key, value);
        }, kDeprecationMessage, 'DEP0152'),
      };
    }
    ObjectDefineProperties(entry, props);
  }
 
  enqueue(entry);
}
 
setupObservers(observerCallback);
 
function hasObserver(type) {
  const observerType = getObserverType(type);
  return observerCounts[observerType] > 0;
}
 
function createBuffer() {
  return {
    head: null,
    tail: null,
    count: 0,
  };
}
 
function resetBuffer(buffer) {
  buffer.head = null;
  buffer.tail = null;
  buffer.count = 0;
}
 
module.exports = {
  PerformanceObserver,
  PerformanceObserverEntryList,
  enqueue,
  hasObserver,
  clearEntriesFromBuffer,
  filterBufferMapByNameAndType,
};