All files / lib/timers promises.js

99.11% Statements 223/225
96.22% Branches 51/53
88.88% Functions 8/9
99.11% Lines 223/225

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 2262x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 3x 3x 3x 3x 3x 3x 2x 160x 160x 160x 4x 4x 4x 4x 4x 4x 156x 156x 156x 160x 6x 6x 160x 5x 5x 5x 5x 5x 5x 160x 160x 160x 160x 3x 3x 160x 160x 142x 142x 142x 4x 4x 4x 4x 4x 160x 160x 4x 4x 160x 160x 2x 33x 33x 4x 4x 4x 4x 4x 4x 29x 29x 29x 33x 6x 6x 33x 5x 5x 5x 5x 5x 5x 18x 18x 18x 33x 2x 2x 33x 33x 16x 16x 16x 3x 3x 3x 3x 3x 3x 33x 33x 3x 3x 33x 33x 2x 71x 71x 71x 71x 71x 71x 71x 71x 53x 53x 53x 53x 53x 53x 53x 421x 421x 124x 124x 124x 53x 53x 71x 6x 4x 4x 4x 1x 1x 1x 1x 1x 6x 6x 6x 71x 71x 126x 126x 124x 125x 131x 131x 126x 71x 71x 10x 10x 10x 10x 71x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x     2x 2x 2x 2x 2x 1x 1x 1x 1x 2x 2x 2x 2x 2x 2x 2x 2x 3x 3x 3x 3x 2x 2x 2x 2x 2x 2x 2x 60x 2x 2x  
'use strict';
 
const {
  FunctionPrototypeBind,
  Promise,
  PromiseReject,
  ReflectConstruct,
  SafePromisePrototypeFinally,
  Symbol,
} = primordials;
 
const {
  Timeout,
  Immediate,
  insert
} = require('internal/timers');
 
const {
  AbortError,
  codes: {
    ERR_ILLEGAL_CONSTRUCTOR,
    ERR_INVALID_ARG_TYPE,
    ERR_INVALID_THIS,
  }
} = require('internal/errors');
 
const {
  validateAbortSignal,
  validateBoolean,
  validateObject,
} = require('internal/validators');
 
const kScheduler = Symbol('kScheduler');
 
function cancelListenerHandler(clear, reject, signal) {
  if (!this._destroyed) {
    clear(this);
    reject(new AbortError(undefined, { cause: signal?.reason }));
  }
}
 
function setTimeout(after, value, options = {}) {
  const args = value !== undefined ? [value] : value;
  if (options == null || typeof options !== 'object') {
    return PromiseReject(
      new ERR_INVALID_ARG_TYPE(
        'options',
        'Object',
        options));
  }
  const { signal, ref = true } = options;
  try {
    validateAbortSignal(signal, 'options.signal');
  } catch (err) {
    return PromiseReject(err);
  }
  if (typeof ref !== 'boolean') {
    return PromiseReject(
      new ERR_INVALID_ARG_TYPE(
        'options.ref',
        'boolean',
        ref));
  }
  // TODO(@jasnell): If a decision is made that this cannot be backported
  // to 12.x, then this can be converted to use optional chaining to
  // simplify the check.
  if (signal && signal.aborted) {
    return PromiseReject(new AbortError(undefined, { cause: signal.reason }));
  }
  let oncancel;
  const ret = new Promise((resolve, reject) => {
    const timeout = new Timeout(resolve, after, args, false, ref);
    insert(timeout, timeout._idleTimeout);
    if (signal) {
      oncancel = FunctionPrototypeBind(cancelListenerHandler,
                                       // eslint-disable-next-line no-undef
                                       timeout, clearTimeout, reject, signal);
      signal.addEventListener('abort', oncancel);
    }
  });
  return oncancel !== undefined ?
    SafePromisePrototypeFinally(
      ret,
      () => signal.removeEventListener('abort', oncancel)) : ret;
}
 
function setImmediate(value, options = {}) {
  if (options == null || typeof options !== 'object') {
    return PromiseReject(
      new ERR_INVALID_ARG_TYPE(
        'options',
        'Object',
        options));
  }
  const { signal, ref = true } = options;
  try {
    validateAbortSignal(signal, 'options.signal');
  } catch (err) {
    return PromiseReject(err);
  }
  if (typeof ref !== 'boolean') {
    return PromiseReject(
      new ERR_INVALID_ARG_TYPE(
        'options.ref',
        'boolean',
        ref));
  }
  // TODO(@jasnell): If a decision is made that this cannot be backported
  // to 12.x, then this can be converted to use optional chaining to
  // simplify the check.
  if (signal && signal.aborted) {
    return PromiseReject(new AbortError(undefined, { cause: signal.reason }));
  }
  let oncancel;
  const ret = new Promise((resolve, reject) => {
    const immediate = new Immediate(resolve, [value]);
    if (!ref) immediate.unref();
    if (signal) {
      oncancel = FunctionPrototypeBind(cancelListenerHandler,
                                       // eslint-disable-next-line no-undef
                                       immediate, clearImmediate, reject,
                                       signal);
      signal.addEventListener('abort', oncancel);
    }
  });
  return oncancel !== undefined ?
    SafePromisePrototypeFinally(
      ret,
      () => signal.removeEventListener('abort', oncancel)) : ret;
}
 
async function* setInterval(after, value, options = {}) {
  validateObject(options, 'options');
  const { signal, ref = true } = options;
  validateAbortSignal(signal, 'options.signal');
  validateBoolean(ref, 'options.ref');
 
  if (signal?.aborted)
    throw new AbortError(undefined, { cause: signal?.reason });
 
  let onCancel;
  let interval;
  try {
    let notYielded = 0;
    let callback;
    interval = new Timeout(() => {
      notYielded++;
      if (callback) {
        callback();
        callback = undefined;
      }
    }, after, undefined, true, ref);
    insert(interval, interval._idleTimeout);
    if (signal) {
      onCancel = () => {
        // eslint-disable-next-line no-undef
        clearInterval(interval);
        if (callback) {
          callback(
            PromiseReject(
              new AbortError(undefined, { cause: signal.reason })));
          callback = undefined;
        }
      };
      signal.addEventListener('abort', onCancel, { once: true });
    }
 
    while (!signal?.aborted) {
      if (notYielded === 0) {
        await new Promise((resolve) => callback = resolve);
      }
      for (; notYielded > 0; notYielded--) {
        yield value;
      }
    }
    throw new AbortError(undefined, { cause: signal?.reason });
  } finally {
    // eslint-disable-next-line no-undef
    clearInterval(interval);
    signal?.removeEventListener('abort', onCancel);
  }
}
 
// TODO(@jasnell): Scheduler is an API currently being discussed by WICG
// for Web Platform standardization: https://github.com/WICG/scheduling-apis
// The scheduler.yield() and scheduler.wait() methods correspond roughly to
// the awaitable setTimeout and setImmediate implementations here. This api
// should be considered to be experimental until the spec for these are
// finalized. Note, also, that Scheduler is expected to be defined as a global,
// but while the API is experimental we shouldn't expose it as such.
class Scheduler {
  constructor() {
    throw new ERR_ILLEGAL_CONSTRUCTOR();
  }
 
  /**
   * @returns {Promise<void>}
   */
  yield() {
    if (!this[kScheduler])
      throw new ERR_INVALID_THIS('Scheduler');
    return setImmediate();
  }
 
  /**
   * @typedef {import('../internal/abort_controller').AbortSignal} AbortSignal
   * @param {number} delay
   * @param {{ signal?: AbortSignal }} [options]
   * @returns {Promise<void>}
   */
  wait(delay, options) {
    if (!this[kScheduler])
      throw new ERR_INVALID_THIS('Scheduler');
    return setTimeout(delay, undefined, { signal: options?.signal });
  }
}
 
module.exports = {
  setTimeout,
  setImmediate,
  setInterval,
  scheduler: ReflectConstruct(function() {
    this[kScheduler] = true;
  }, [], Scheduler),
};