Moving to async/await while keeping filter raises 'Connection refused: connect' and 'ECONNREFUSED connect ECONNREFUSED 127.0.0.1:4444'

Bug report

• Node Version: v8.5.0
• Protractor Version: 5.1.0
• Angular Version: 1.6.7
• Browser(s): Chrome 64.0.3282.140
• Operating System and Version Windows 7

While trying to move away from the promise manager of Selenium, I encountered new random failures which were not occurring before. After analyze it appeared that it might be linked to the filter function offered by Protractor.

Here is an extract of the configuration and scripts I am using. All the code is available on https://github.com/dubzzz/protractor-move-async-await. The localhost:3000 exposes the todolist example of AngularJS official website with a list of a thousand entries.

Using the promise manager:

conf.js

exports.config = {
  seleniumAddress: 'http://localhost:4444/wd/hub',
  specs: ['todo-spec.js'],
  SELENIUM_PROMISE_MANAGER: 1
};

todo-spec.js

browser.get('http://localhost:3000/index.html');
element.all(by.repeater('todo in todoList.todos'))
  .filter(todo => todo.getText().then(label => label.indexOf('#10') !== -1))
  .each(todo => todo.element(by.css('input')).click());

Using async/await:

conf.js

exports.config = {
  seleniumAddress: 'http://localhost:4444/wd/hub',
  specs: ['todo-spec.js'],
  SELENIUM_PROMISE_MANAGER: 0
};

todo-spec.js

await browser.get('http://localhost:3000/index.html');
await element(by.model('todoList.todoText')).sendKeys('write first protractor test');
await element(by.css('[value="add"]')).click();
await element.all(by.repeater('todo in todoList.todos'))
  .filter(todo => todo.getText().then(label => label.indexOf('#10') !== -1))
  .each(todo => todo.element(by.css('input')).click());

The asynchronous version failed with the following error:

1) [async] angularjs homepage todo list should add a todo
  Message:
    Failed: java.net.ConnectException: Connection refused: connect

The full proof off concept is available on my personal Github at https://github.com/dubzzz/protractor-move-async-await

Is the bug coming from an issue in my configuration or is there a real issue?

Thanks in advance

[CrispusDH]

You could override filter function to force send requests sequential.

 private makeFnSequential(func: any): any {
    let promise: any = Promise.resolve();

    return (...args) => {
      promise = promise.then(() => {
        return func(...args);
      });

      return promise;
    };
  }
}

use this method to wrap filterFn.

Second option is to run your tests directly on chrome (add to config directConnect: true). In that way selenium server will not use at all, so any java errors 😃

[awarecan]

Also you can try my another patch for chromeDriver persistence connection issue. I don’t have problem for a while after apply both patch

var chromeFile = 'node_modules/selenium-webdriver/chrome.js';
fs.readFile(chromeFile, 'utf8', function (err, data) {
    if (err)
        throw err;
    
    var result = data.replace(/new http.HttpClient\(url\)/g, "new http.HttpClient(url, new (require('http').Agent)({ keepAlive: true }))");
    console.log(`Patching ${chromeFile}`)
    fs.writeFileSync(chromeFile, result, 'utf8');
});