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ruby-on-rails – Net :: ReadTimeout：Net :: ReadTimeout和Sel

发布时间：2020-12-17 01:57:17 所属栏目：百科 来源：网络整理
导读：关于将Capybara烘焙到新版Rails(5.1)cf http://weblog.rubyonrails.org/2017/2/23/Rails-5-1-beta1/中的热情 我遇到了一个问题.这是我的步骤.任何线索欢迎. 全新安装： Linux Ubuntu Desktop 16.10(Hyper-V上的VM),Chrome安装并运行正常; Ruby 2.4; Rails 5.
关于将Capybara烘焙到新版Rails(5.1)cf http://weblog.rubyonrails.org/2017/2/23/Rails-5-1-beta1/中的热情

我遇到了一个问题.这是我的步骤.任何线索欢迎.

全新安装：

> Linux Ubuntu Desktop 16.10(Hyper-V上的VM),Chrome安装并运行正常;
> Ruby 2.4;
> Rails 5.1.beta.

1.-创建一个简单的应用程序：

~$ruby -v
    ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-linux]
    ~$rails -v
    Rails 5.1.0.beta1
    ~$mkdir railsapps
    ~$cd railsapps
    ~/railsapps$rails new smoketestapp
    ~/railsapps$cd smoketestapp
    ~/railsapps/smoketestapp$rails generate scaffold post title:string body:text
    ~/railsapps/smoketestapp$rails db:migrate

2.-运行测试

~/railsapps/smoketestapp$cat test/system/posts_test.rb
    require "application_system_test_case"

    class PostsTest < ApplicationSystemTestCase
      test "visiting the index" do
        visit posts_url

        assert_selector "h1",text: "Post"
      end
    end

     ~/railsapps/smoketestapp$rake test TEST=test/system/posts_test.rb
    Run options: --seed 55778

    # Running:
    ...
    Error:
    PostsTest#test_visiting_the_index:
    Selenium::WebDriver::Error::WebDriverError: Unable to find chromedriver. Please download the server from http://chromedriver.storage.googleapis.com/index.html and place it somewhere on your PATH. More info at https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver.
    ...
    1 runs,0 assertions,0 failures,1 errors,0 skips
     ~/railsapps/smoketestapp$

3.-好的,让我们按照错误消息(安装chromedriver)中的建议进行操作：

~/railsapps/smoketestapp$ls /usr/bin/google-chrome
    lrwxrwxrwx 1 root root 31 Mar 18 15:31 /usr/bin/google-chrome -> /etc/alternatives/google-chrome*
     ~/railsapps/smoketestapp$echo $PATH 
    ...:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:...
     ~/railsapps/smoketestapp$wget https://chromedriver.storage.googleapis.com/2.28/chromedriver_linux64.zip
     ~/railsapps/smoketestapp$unzip chromedriver_linux64.zip
     ~/railsapps/smoketestapp$sudo cp chromedriver /usr/local/bin
     ~/railsapps/smoketestapp$ls /usr/local/bin
    total 7504
    drwxr-xr-x  2 root root    4096 Mar 19 19:05 ./
    drwxr-xr-x 10 root root    4096 Okt 12 22:42 ../
    -rwxr-xr-x  1 root root 7673176 Mar 19 19:05 chromedriver*
     ~/railsapps/smoketestapp$

好的.重试测试……

~/railsapps/smoketestapp$rake test TEST=test/system/posts_test.rb
    Run options: --seed 51574

    # Running:
    ...
    Error:
    PostsTest#test_visiting_the_index:
    Net::ReadTimeout: Net::ReadTimeout test/system/posts _test.rb:5:in `block in '
    ...
    bin/rails test test/system/posts_test.rb:4
    ...
    1 runs,0 skips
     ~/railsapps/smoketestapp$

不好！

在app dir中运行rails -v时给出了’Net :: ReadTimeout：Net :: ReadTimeout’错误消息的根本原因的线索,给出了Selenium :: WebDriver :: Error :: UnknownError：未知错误：Chrome未能开始：

~/railsapps/smoketestapp$rails -v
    Run options: --seed 39896
    # Running:
    .......E
    Error:
    PostsTest#test_visiting_the_index:
    Selenium::WebDriver::Error::UnknownError: unknown error: Chrome failed to start: exited abnormally
      (Driver info: chromedriver=2.28.455506  (18f6627e265f442aeec9b6661a49fe819aeeea1f),platform=Linux 4.8.0-41-generic x86_64)
        test/system/posts_test.rb:5:in `block in <class:PostsTest>'
    Error:
    PostsTest#test_visiting_the_index:
    Net::ReadTimeout: Net::ReadTimeout

    bin/rails test test/system/posts_test.rb:4
    ...
    ~/railsapps/smoketestapp$

这是我直接从Ruby调用Selenium WebDriver时得到的：

~/railsapps/smoketestapp$irb
    2.4.0 :001 > require "selenium-webdriver"
     => true
    2.4.0 :002 > driver = Selenium::WebDriver.for(:chrome)
    Net::ReadTimeout: Net::ReadTimeout
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:176:in `rbuf_fill'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:154:in `readuntil'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/protocol.rb:164:in `readline'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http/response.rb:40:in `read_status_line'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http/response.rb:29:in `read_new'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1446:in `block in transport_request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1443:in `catch'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1443:in `transport_request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1416:in `request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1409:in `block in request'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:877:in `start'
    from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/net/http.rb:1407:in `request'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:124:in `response_for'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:78:in `request'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:61:in `call'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:669:in `raw_execute'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:108:in `create_session'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:71:in `initialize'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/chrome/bridge.rb:52:in `initialize'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:61:in `new'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/driver.rb:61:in `for'
    from ~/.rvm/gems/ruby-2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver.rb:87:in `for'
    from (irb):2
    from ~/.rvm/rubies/ruby-2.4.0/bin/irb:11:in `<main>'
    2.4.0 :003 > exit
    ~/railsapps/smoketestapp$

任何帮助表示感谢,谢谢

瓦鲁斯

更新：

发现问题,查看Selenium驱动程序的日志文件.为此,我在IRB中输入以下内容：

require "selenium-webdriver"
    Selenium::WebDriver::Chrome.driver_path="/usr/local/bin/chromedriver"
    Selenium::WebDriver.for :chrome,:service_log_path => "/tmp/cd.log"
    driver = Selenium::WebDriver.for(:chrome)

拖尾日志文件钉住它：chrome不会启动：

~/railsapps/smoketestapp$tail /tmp/cd.log
       ...
    [0.247][INFO]: Launching chrome: /opt/google/chrome/google-chrome --disable-background-networking --disable-client-side-phishing-detection --disable-component-update --disable-default-apps --disable-hang-monitor --disable-prompt-on-repost --disable-web-resources --enable-logging --full-memory-crash-report --ignore-certificate-errors --load-extension=/tmp/.org.chromium.Chromium.Pdre6o/internal --logging-level=1 --metrics-recording-only --no-first-run --password-store=basic --remote-debugging-port=12264 --safebrowsing-disable-auto-update --safebrowsing-disable-download-protection --use-mock-keychain --user-data-dir=/tmp/.org.chromium.Chromium.mHJaEd data:,[0.250][WARNING]: PAC support disabled because there is no system implementation
    [20.281][INFO]: RESPONSE InitSession unknown error: Chrome failed to start: exited abnormally
    ~/railsapps/smoketestapp$

最后,我发现通过PuTTY远程调用chrome不起作用(这就是我一直在做的事情),尽管直接在VM上(在终端服务器中)做同样的工作.

在PuTTY上：

~$google-chrome
    [3938:3938:0320/213941.129923:ERROR:browser_main_loop.cc(279)] Gtk: cannot open display:

然而,直接在VM上工作.

不幸的是,我的幸福是短暂的,因为我遇到了另一个错误,但这是另一个故事：

irb(main):001:0> require "selenium-webdriver"
    => true
    irb(main):002:0> Selenium::WebDriver::Chrome.driver_path="/usr/local/bin/chromedriver"
    => "/usr/local/bin/chromedriver"
    irb(main):003:0> driver = Selenium::WebDriver.for(:chrome)
    => #<Selenium::WebDriver::Driver:0x59d7c889a916c6b8 browser=:chrome>
    irb(main):004:0> driver.navigate.to("http://www.google.com")
    Selenium::WebDriver::Error::UnknownError: unknown error: Runtime.executionContextCreated has invalid 'context': {"auxData":{"frameId":"10797.1","isDefault":true},"id":1,"name":"","origin":"://"}
      (Session info: chrome=57.0.2987.110)
      (Driver info: chromedriver=2.4.226074,platform=Linux 4.8.0-41-generic x86_64)
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/response.rb:69:in `assert_ok'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/response.rb:32:in `initialize'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:83:in `new'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:83:in `create_response'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/default.rb:107:in `request'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/http/common.rb:61:in `call'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:669:in `raw_execute'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:647:in `execute'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/remote/bridge.rb:120:in `get'
            from ~/.rvm/rubies/ruby-2.4.0/lib/ruby/gems/2.4.0/gems/selenium-webdriver-3.3.0/lib/selenium/webdriver/common/navigation.rb:32:in `to'
            from (irb):4
            from ~/.rvm/rubies/ruby-2.4.0/bin/irb:11:in `<main>'
    irb(main):005:0> exit

解决方法

最终,我想用Capybara进行系统测试,这些测试可以在我的设置中运行(开发机器= VM,OS = Linux Ubuntu,通过PuTTY远程访问).

我找到了一种让它发挥作用的方法.

为此,我放弃了Chrome及其Selenium驱动程序,用于PhantomJS和恶作剧.

PhantomJS是一个无头浏览器(=无GUI).它很棒.这是我的步骤(Rails 5.1)：

>将宝石’poltergeist’添加到您的Gemfile中,并注释掉gem’selenium-webdriver'(Chrome需要更晚,我们不会使用)：

#gem 'selenium-webdriver'
gem 'poltergeist'

>运行捆绑包更新
>添加poltergeist驱动程序配置(在文件application_system_test_case.rb中),注释掉chrome驱动程序配置：

$cat test/application_system_test_case.rb

require "test_helper"

require "capybara/poltergeist"
Capybara.javascript_driver = :poltergeist      

class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  # driven_by :selenium,using: :chrome,screen_size: [1400,1400]
  driven_by :poltergeist
end

>下载’PhamtomJS’无头浏览器,并将其放在PATH中的目录中：

$wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.8-linux-x86_64.tar.bz2
$tar -xjvf phantomjs-1.9.8-linux-x86_64.tar.bz2
$sudo cp phantomjs-1.9.8-linux-x86_64/bin/phantomjs /usr/local/bin
$sudo chmod +x /usr/local/bin/phantomjs

>您已经准备好了,并准备好进行系统测试.例如：

$rake test TEST=test/system/posts_test.rb
Run options: --seed 38196

# Running:

Puma starting in single mode...
* Version 3.8.2 (ruby 2.4.0-p0),codename: Sassy Salamander
* Min threads: 0,max threads: 1
* Environment: test
* Listening on tcp://0.0.0.0:44265
Use Ctrl-C to stop
You're running an old version of PhantomJS,update to >= 2.1.1 for a better experience.
.

Finished in 1.366478s,0.7318 runs/s,0.7318 assertions/s.

1 runs,1 assertions,0 errors,0 skips
$

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