node/test/async-hooks/test-pipewrap.js

// NOTE: this also covers process wrap as one is created along with the pipes
// when we launch the sleep process
'use strict';
// Flags: --expose-gc

const common = require('../common');
const assert = require('assert');
const tick = require('./tick');
const initHooks = require('./init-hooks');
const { checkInvocations } = require('./hook-checks');
const spawn = require('child_process').spawn;

const hooks = initHooks();

hooks.enable();
const nodeVersionSpawn = spawn(process.execPath, [ '--version' ]);

nodeVersionSpawn
  .on('exit', common.mustCall(onsleepExit))
  .on('close', common.mustCall(onsleepClose));

// a process wrap and 3 pipe wraps for std{in,out,err} are initialized
// synchronously
const processes = hooks.activitiesOfTypes('PROCESSWRAP');
const pipes = hooks.activitiesOfTypes('PIPEWRAP');
assert.strictEqual(processes.length, 1,
                   '1 processwrap created when process created');
assert.strictEqual(pipes.length, 3,
                   '3 pipe wraps created when process created');

const processwrap = processes[0];
const pipe1 = pipes[0];
const pipe2 = pipes[1];
const pipe3 = pipes[2];

assert.strictEqual(processwrap.type, 'PROCESSWRAP', 'process wrap type');
assert.strictEqual(processwrap.triggerId, 1, 'processwrap triggerId is 1');
checkInvocations(processwrap, { init: 1 },
                 'processwrap when sleep.spawn was called');

[ pipe1, pipe2, pipe3 ].forEach((x) => {
  assert(x.type, 'PIPEWRAP', 'pipe wrap type');
  assert.strictEqual(x.triggerId, 1, 'pipe wrap triggerId is 1');
  checkInvocations(x, { init: 1 }, 'pipe wrap when sleep.spawn was called');
});

function onsleepExit(code) {
  checkInvocations(processwrap, { init: 1, before: 1 },
                   'processwrap while in onsleepExit callback');
}

function onsleepClose() {
  tick(1, () =>
    checkInvocations(
      processwrap,
      { init: 1, before: 1, after: 1 },
      'processwrap while in onsleepClose callback')
  );
}

process.on('exit', onexit);

function onexit() {
  hooks.disable();
  hooks.sanityCheck('PROCESSWRAP');
  hooks.sanityCheck('PIPEWRAP');

  checkInvocations(
    processwrap,
    { init: 1, before: 1, after: 1 },
    'processwrap while in onsleepClose callback');

  [ pipe1, pipe2, pipe3 ].forEach((x) => {
    assert(x.type, 'PIPEWRAP', 'pipe wrap type');
    assert.strictEqual(x.triggerId, 1, 'pipe wrap triggerId is 1');
  });

  const ioEvents = Math.min(pipe2.before.length, pipe2.after.length);
  // 2 events without any IO and at least one more for the node version data.
  // Usually it is just one event, but it can be more.
  assert.ok(ioEvents >= 3, 'at least 3 stdout io events.');

  checkInvocations(pipe1, { init: 1, before: 2, after: 2 },
                   'pipe wrap when sleep.spawn was called');
  checkInvocations(pipe2, { init: 1, before: ioEvents, after: ioEvents },
                   'pipe wrap when sleep.spawn was called');
  checkInvocations(pipe3, { init: 1, before: 2, after: 2 },
                   'pipe wrap when sleep.spawn was called');
}