All files / lib/internal promise_hooks.js

86.5% Statements 109/126
100% Branches 23/23
100% Functions 7/7
86.5% Lines 109/126

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 12721x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 1x 1x 1x 1x 1x 2x 2x 2x 2x 1x 1x 2x 1x 1x 1x 1x 1x 1x 1x 21x 3675x 3675x                                   3675x 3675x 21x 21x 21x 21x 21x 63368x 63368x 63368x 21x 15842x 15842x 15842x 15842x 15842x 15842x 15842x 21x 7492x 7492x 7492x 7486x 7486x 7486x 7492x 21x 4900x 4900x 4900x 8372x 8372x 8372x 8372x 4900x 4900x 21x 21x 21x 21x 21x 21x 2772x 2772x 2772x 2772x 2772x 2772x 2766x 2764x 2764x 2478x 7483x 7483x 2764x 2772x 21x 21x 21x 21x 21x 21x 21x 21x  
'use strict';
 
const {
  ArrayPrototypeIndexOf,
  ArrayPrototypeSlice,
  ArrayPrototypeSplice,
  ArrayPrototypePush,
  FunctionPrototypeBind
} = primordials;
 
const { setPromiseHooks } = internalBinding('async_wrap');
const { triggerUncaughtException } = internalBinding('errors');
 
const { kEmptyObject } = require('internal/util');
const { validatePlainFunction } = require('internal/validators');
 
const hooks = {
  init: [],
  before: [],
  after: [],
  settled: []
};
 
function initAll(promise, parent) {
  const hookSet = ArrayPrototypeSlice(hooks.init);
  const exceptions = [];
 
  for (let i = 0; i < hookSet.length; i++) {
    const init = hookSet[i];
    try {
      init(promise, parent);
    } catch (err) {
      ArrayPrototypePush(exceptions, err);
    }
  }
 
  // Triggering exceptions is deferred to allow other hooks to complete
  for (let i = 0; i < exceptions.length; i++) {
    const err = exceptions[i];
    triggerUncaughtException(err, false);
  }
}
 
function makeRunHook(list) {
  return (promise) => {
    const hookSet = ArrayPrototypeSlice(list);
    const exceptions = [];

    for (let i = 0; i < hookSet.length; i++) {
      const hook = hookSet[i];
      try {
        hook(promise);
      } catch (err) {
        ArrayPrototypePush(exceptions, err);
      }
    }

    // Triggering exceptions is deferred to allow other hooks to complete
    for (let i = 0; i < exceptions.length; i++) {
      const err = exceptions[i];
      triggerUncaughtException(err, false);
    }
  };
}
 
const beforeAll = makeRunHook(hooks.before);
const afterAll = makeRunHook(hooks.after);
const settledAll = makeRunHook(hooks.settled);
 
function maybeFastPath(list, runAll) {
  return list.length > 1 ? runAll : list[0];
}
 
function update() {
  const init = maybeFastPath(hooks.init, initAll);
  const before = maybeFastPath(hooks.before, beforeAll);
  const after = maybeFastPath(hooks.after, afterAll);
  const settled = maybeFastPath(hooks.settled, settledAll);
  setPromiseHooks(init, before, after, settled);
}
 
function stop(list, hook) {
  const index = ArrayPrototypeIndexOf(list, hook);
  if (index >= 0) {
    ArrayPrototypeSplice(list, index, 1);
    update();
  }
}
 
function makeUseHook(name) {
  const list = hooks[name];
  return (hook) => {
    validatePlainFunction(hook, `${name}Hook`);
    ArrayPrototypePush(list, hook);
    update();
    return FunctionPrototypeBind(stop, null, list, hook);
  };
}
 
const onInit = makeUseHook('init');
const onBefore = makeUseHook('before');
const onAfter = makeUseHook('after');
const onSettled = makeUseHook('settled');
 
function createHook({ init, before, after, settled } = kEmptyObject) {
  const hooks = [];
 
  if (init) ArrayPrototypePush(hooks, onInit(init));
  if (before) ArrayPrototypePush(hooks, onBefore(before));
  if (after) ArrayPrototypePush(hooks, onAfter(after));
  if (settled) ArrayPrototypePush(hooks, onSettled(settled));
 
  return () => {
    for (const stop of hooks) {
      stop();
    }
  };
}
 
module.exports = {
  createHook,
  onInit,
  onBefore,
  onAfter,
  onSettled
};