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Current File : //proc/self/root/home/ubuntu/node-v16.18.1/test/parallel/test-domain-emit-error-handler-stack.js
'use strict';

const common = require('../common');
const assert = require('assert');
const domain = require('domain');
const EventEmitter = require('events');

// Make sure that the domains stack and the active domain is setup properly when
// a domain's error handler is called due to an error event being emitted.
// More specifically, we want to test that:
// - the active domain in the domain's error handler is//not* that domain,//but*
//   the active domain is a any direct parent domain at the time the error was
//   emitted.
// - the domains stack in the domain's error handler does//not* include that
//   domain, *but* it includes all parents of that domain when the error was
//   emitted.
const d1 = domain.create();
const d2 = domain.create();
const d3 = domain.create();

function checkExpectedDomains(err) {
  // First, check that domains stack and active domain is as expected when the
  // event handler is called synchronously via ee.emit('error').
  if (domain._stack.length !== err.expectedStackLength) {
    console.error('expected domains stack length of %d, but instead is %d',
                  err.expectedStackLength, domain._stack.length);
    process.exit(1);
  }

  if (process.domain !== err.expectedActiveDomain) {
    console.error('expected active domain to be %j, but instead is %j',
                  err.expectedActiveDomain, process.domain);
    process.exit(1);
  }

  // Then make sure that the domains stack and active domain is setup as
  // expected when executing a callback scheduled via nextTick from the error
  // handler.
  process.nextTick(() => {
    const expectedStackLengthInNextTickCb =
            err.expectedStackLength > 0 ? 1 : 0;
    if (domain._stack.length !== expectedStackLengthInNextTickCb) {
      console.error('expected stack length in nextTick cb to be %d, ' +
                'but instead is %d', expectedStackLengthInNextTickCb,
                    domain._stack.length);
      process.exit(1);
    }

    const expectedActiveDomainInNextTickCb =
            expectedStackLengthInNextTickCb === 0 ? undefined :
              err.expectedActiveDomain;
    if (process.domain !== expectedActiveDomainInNextTickCb) {
      console.error('expected active domain in nextTick cb to be %j, ' +
                'but instead is %j', expectedActiveDomainInNextTickCb,
                    process.domain);
      process.exit(1);
    }
  });
}

d1.on('error', common.mustCall((err) => {
  checkExpectedDomains(err);
}, 2));

d2.on('error', common.mustCall((err) => {
  checkExpectedDomains(err);
}, 2));

d3.on('error', common.mustCall((err) => {
  checkExpectedDomains(err);
}, 1));

d1.run(() => {
  const ee = new EventEmitter();
  assert.strictEqual(process.domain, d1);
  assert.strictEqual(domain._stack.length, 1);

  const err = new Error('oops');
  err.expectedStackLength = 0;
  err.expectedActiveDomain = null;
  ee.emit('error', err);

  assert.strictEqual(process.domain, d1);
  assert.strictEqual(domain._stack.length, 1);
});

d1.run(() => {
  d1.run(() => {
    const ee = new EventEmitter();

    assert.strictEqual(process.domain, d1);
    assert.strictEqual(domain._stack.length, 2);

    const err = new Error('oops');
    err.expectedStackLength = 0;
    err.expectedActiveDomain = null;
    ee.emit('error', err);

    assert.strictEqual(process.domain, d1);
    assert.strictEqual(domain._stack.length, 2);
  });
});

d1.run(() => {
  d2.run(() => {
    const ee = new EventEmitter();

    assert.strictEqual(process.domain, d2);
    assert.strictEqual(domain._stack.length, 2);

    const err = new Error('oops');
    err.expectedStackLength = 1;
    err.expectedActiveDomain = d1;
    ee.emit('error', err);

    assert.strictEqual(process.domain, d2);
    assert.strictEqual(domain._stack.length, 2);
  });
});

d1.run(() => {
  d2.run(() => {
    d2.run(() => {
      const ee = new EventEmitter();

      assert.strictEqual(process.domain, d2);
      assert.strictEqual(domain._stack.length, 3);

      const err = new Error('oops');
      err.expectedStackLength = 1;
      err.expectedActiveDomain = d1;
      ee.emit('error', err);

      assert.strictEqual(process.domain, d2);
      assert.strictEqual(domain._stack.length, 3);
    });
  });
});

d3.run(() => {
  d1.run(() => {
    d3.run(() => {
      d3.run(() => {
        const ee = new EventEmitter();

        assert.strictEqual(process.domain, d3);
        assert.strictEqual(domain._stack.length, 4);

        const err = new Error('oops');
        err.expectedStackLength = 2;
        err.expectedActiveDomain = d1;
        ee.emit('error', err);

        assert.strictEqual(process.domain, d3);
        assert.strictEqual(domain._stack.length, 4);
      });
    });
  });
});

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