ruby-on-rails - 在 Windows 中执行 cron 时运行

Question

在 cronjobs 和类似的东西上完全是新手，以前从未做过，所以现在我在 RailsCasts 上看到它后，尝试将 whenever 作为插件使用。所以我正在尝试为我的 Ruby 应用程序运行一个 cron 作业，但它似乎无法正常工作，可能是因为代码原因，也可能是因为我使用的是 Windows 7？

这是我的服务器模型的代码

def self.ping
 Server.all.each do |t|
     if t.name.serverUp?
        @response = 'Up'
      else
        @response = 'Down'
     end
self.update_attribute(:serverStatus, @response.to_s)
end
end


def serverUp?
 if system 'ping '+name.to_s+' -n 1  > nul'
   @response = 'Up'
        else
  @response = 'Down'
end
  self.update_attribute(:serverStatus, @response.to_s)
@response
end

这是我的 schedule.rb 文件中的代码，其中包含 cron 作业

#every 2.minutes do
#  runner "Server.last.name = 'Works'"
#  runner "for x in Server.all.each {x.serverUp?}", environment =>"development"
#end

every 2.minutes do
  runner "Server.ping", environment =>"development"
end

我尝试了这两种方法，(我最近使用的是后者，我在服务器模型中为其创建了 self.ping 方法。

因此，当我在我的 rails 目录中运行 whenever 时，这是我得到的输出:

PS C:\SIS> whenever
0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58 * * * * /bin/bash -l -c 'cd C:/SIS
&& script/rails runner -e production '\''Server.ping'\'''

## [message] Above is your schedule file converted to cron syntax; your crontab file was not updated.
## [message] Run `whenever --help' for more options.

1st) 有趣的是，即使我在代码中声明了，环境似乎并没有改变为开发。2nd) crontab 文件没有更新(我什至不知道是否存在一个开始？)

所以我尝试通过运行 whenever -w ping 创建一个 crontab whenever file，但结果是

PS C:\SIS> whenever -w ping
[fail] Couldn't write crontab; try running `whenever' with no options to ensure your schedule file is valid.

所以这是我的问题，我们将不胜感激。

编辑: 好的，我决定使用 rufus-scheduler 来经常更新我的服务器列表。我测试了每隔几分钟在表中创建一个新服务器是否可行，这似乎可行。但是，因为我无法阻止它创建服务器，所以我将它从 bundle 中删除，删除了“task_scheduler”文件，然后重新安装它并像以前一样完成所有操作。但是，当我现在尝试运行服务器时，出现以下错误:

C:/SIS/config/initializers/task_scheduler.rb:1:in '<top (required)>': undefined method 'start_new' for Rufus::Scheduler:
Module (NoMethodError)
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in 'load'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in 'block in load'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in 'block in load_dependency'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in 'new_constants_in'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in 'load_dependency'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in 'load'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/engine.rb:201:in 'block (2 levels) in <class:Engine>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/engine.rb:200:in 'each'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/engine.rb:200:in 'block in <class:Engine>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/initializable.rb:25:in 'instance_exec'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/initializable.rb:25:in 'run'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/initializable.rb:50:in 'block in run_initializers'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/initializable.rb:49:in 'each'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/initializable.rb:49:in 'run_initializers'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/application.rb:134:in 'initialize!'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/application.rb:77:in 'method_missing'
        from C:/SIS/config/environment.rb:5:in '<top (required)>'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in 'require'

        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in 'block in require'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in 'block in load_dependency'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in 'new_constants_in'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in 'load_dependency'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:239:in 'require'

        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/application.rb:103:in 'require_environment!'
        from C:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.9/lib/rails/commands.rb:22:in '<top (required)>'
        from script/rails:6:in 'require'
        from script/rails:6:in '<main>'

task_scheduler中的代码如下:

scheduler = Rufus::Scheduler.start_new

scheduler.every '1m' do
#     Server.all.each do
#      |server| server.name.serverUp?
#     end

     Server.ping

end

不确定使用这两种方法中的哪一种，因此我将第一种方法注释掉了。帮助将不胜感激。提前致谢

编辑好吧，终于解决了，不得不把 require 'rubygems'
在我的代码顶部需要“rufus/scheduler”。现在它工作正常:-)

Answer 1

Cron 是一个 Unix 程序。它在 Windows 上不存在。