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 12723x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 23x 1x 1x 1x 1x 1x 2x 2x 2x 2x 1x 1x 2x 1x 1x 1x 1x 1x 1x 1x 23x 3705x 3705x                                   3705x 3705x 23x 23x 23x 23x 23x 63152x 63152x 63152x 23x 15788x 15788x 15788x 15788x 15788x 15788x 15788x 23x 7465x 7465x 7465x 7459x 7459x 7459x 7465x 23x 4940x 4940x 4940x 8345x 8345x 8345x 8345x 4940x 4940x 23x 23x 23x 23x 23x 23x 2763x 2763x 2763x 2763x 2763x 2763x 2757x 2755x 2755x 2469x 7456x 7456x 2755x 2763x 23x 23x 23x 23x 23x 23x 23x 23x  
'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
};