ruby - Net::ReadTimeout on headless Firefox Watir-WebDriver cukes

Question

我今天开始遇到吨这些错误:

Net::ReadTimeout (Net::ReadTimeout)
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/protocol.rb:158:in `rescue in rbuf_fill'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/protocol.rb:152:in `rbuf_fill'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/protocol.rb:134:in `readuntil'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/protocol.rb:144:in `readline'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http/response.rb:39:in `read_status_line'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http/response.rb:28:in `read_new'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1405:in `block in transport_request'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1402:in `catch'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1402:in `transport_request'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1375:in `request'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1368:in `block in request'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:851:in `start'
      /usr/local/rvm/rubies/ruby-2.0.0-p0/lib/ruby/2.0.0/net/http.rb:1366:in `request'

我在 Firefox 21、Ubuntu 服务器上 headless 运行(通过 headless gem)Watir-WebDriver cukes。这是活跃的 gem 包:

Gems included by the bundle:
  * builder (3.2.2)
  * bundler (1.3.5)
  * childprocess (0.3.9)
  * cucumber (1.3.2)
  * cwtestgen (0.1.6)
  * data_magic (0.14)
  * diff-lcs (1.2.4)
  * faker (1.1.2)
  * ffi (1.8.1)
  * gherkin (2.12.0)
  * headless (1.0.1)
  * i18n (0.6.4)
  * multi_json (1.7.5)
  * page-object (0.8.10)
  * page_navigation (0.9)
  * require_all (1.2.1)
  * rspec (2.13.0)
  * rspec-core (2.13.1)
  * rspec-expectations (2.13.0)
  * rspec-mocks (2.13.1)
  * rubyzip (0.9.9)
  * selenium-webdriver (2.33.0)
  * syntax (1.0.0)
  * thor (0.18.1)
  * watir-webdriver (0.6.4)
  * watir-webdriver-performance (0.2.2)
  * websocket (1.0.7)
  * yml_reader (0.2)

我什至不知道从哪里开始解决这个问题。超时是随机的。当我在 OS X(非 headless )的 Firefox 21 上运行这些测试时，它们不会发生。有谁之前经历过这个吗？非常感谢任何和所有想法 - 谢谢!

Answer 1

我遇到了这个问题。我不知道为什么会这样，但我找到了解决办法。我只是终止 watir 浏览器和 headless ，然后我重试。问题是 watir 失去了与浏览器的连接，因此无法终止。我认为这是最初问题的一部分。为了终止 watir 浏览器，我使用 YAML 转储浏览器对象，然后解析结果以找到模拟浏览器的 pid。完成后，kill 命令将发送到正确的 pid。最后浏览器和 headless 被重新初始化。

tryLeft = 3
begin
  @watir.goto url
rescue => error
  tryLeft -= 1

  if tryLeft >= 0
    sleep 1
    retry
  end

  begin
    Timeout::timeout(2) { @watir.close }
  rescue
    File.open(@tmpDumpFile, 'w') { |file| file << YAML::dump(@watir) }
    `awk '/pid:/ {print $2;}' "#{@tmpDumpFile}" | xargs -rt kill 2>&1`
    FileUtils.rm_f(@tmpDumpFile)
  end

  @headless.stop
  `killall Xvfb 2>&1`

  # Reinitialize @watir / @headless then retry
end