node/test/simple/test-domain-implicit-fs.js

// Copyright Joyent, Inc. and other Node contributors.
//
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//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// USE OR OTHER DEALINGS IN THE SOFTWARE.


// Simple tests of most basic domain functionality.

var common = require('../common');
var assert = require('assert');
var domain = require('domain');
var events = require('events');
var caught = 0;
var expectCaught = 1;

var d = new domain.Domain();
var e = new events.EventEmitter();

d.on('error', function(er) {
  console.error('caught', er);
  switch (er.message) {
    case "ENOENT, open 'this file does not exist'":
      assert.equal(er.domain, d);
      assert.equal(er.domain_thrown, true);
      assert.ok(!er.domain_emitter);
      assert.equal(er.code, 'ENOENT');
      assert.equal(er.path, 'this file does not exist');
      assert.equal(typeof er.errno, 'number');
      break;

    default:
      console.error('unexpected error, throwing %j', er.message);
      throw er;
  }

  caught++;
});

process.on('exit', function() {
  console.error('exit');
  assert.equal(caught, expectCaught);
  console.log('ok');
});


// implicit handling of thrown errors while in a domain, via the
// single entry points of ReqWrap and MakeCallback.  Even if
// we try very hard to escape, there should be no way to, even if
// we go many levels deep through timeouts and multiple IO calls.
// Everything that happens between the domain.enter() and domain.exit()
// calls will be bound to the domain, even if multiple levels of
// handles are created.
d.run(function() {
  setTimeout(function() {
    var fs = require('fs');
    fs.readdir(__dirname, function() {
      fs.open('this file does not exist', 'r', function(er) {
        if (er) throw er;
        throw new Error('should not get here!');
      });
    });
  }, 100);
});