ruby – Fork WEBrick并等待开始

发布时间：2020-12-17 03:22:54 所属栏目：百科来源：网络整理

导读：我有以下代码,其中WEBrick实例是分叉的,我想等到webrick启动,然后继续其余的代码： require 'webrick'pid = fork do server = WEBrick::HTTPServer.new({:Port = 3333,:BindAddress = "localhost"}) trap("INT") { server.shutdown } sleep 10 # here is cod

我有以下代码,其中WEBrick实例是分叉的,我想等到webrick启动,然后继续其余的代码：

require 'webrick'

pid = fork do
  server = WEBrick::HTTPServer.new({:Port => 3333,:BindAddress => "localhost"})
  trap("INT") { server.shutdown }
  sleep 10 # here is code that take some time to setup
  server.start
end
# here I want to wait till the fork is complete or the WEBrick server is started and accepts connections
puts `curl localhost:3333 --max-time 1` # then I can talk to the webrick
Process.kill('INT',pid) # finally the webrick should be killed

那么我怎么能等到fork完成,甚至更好,直到WEBrick准备好接受连接？我发现了一段代码,它们处理IO.pipe,读者和作者.但这并不等待webrick加载.

不幸的是,我没有找到任何针对这个具体案例希望有人能提供帮助.

解决方法

WEBRick :: GenericServer有一些未记录的回调钩子(遗憾的是,事实上,整个webrick库记录很少！),例如 :StartCallback,:StopCallback,:AcceptCallback.您可以在初始化WEBRick :: HTTPServer实例时提供钩子.

因此,结合IO.pipe,您可以编写如下代码：

require 'webrick'

PORT = 3333

rd,wt = IO.pipe

pid = fork do
  rd.close
  server = WEBrick::HTTPServer.new({
    :Port => PORT,:BindAddress => "localhost",:StartCallback => Proc.new {
      wt.write(1)  # write "1",signal a server start message
      wt.close
    }
  })
  trap("INT") { server.shutdown }
  server.start
end

wt.close
rd.read(1)  # read a byte for the server start signal
rd.close

puts `curl localhost:#{PORT} --max-time 1` # then I can talk to the webrick
Process.kill('INT',pid) # finally the webrick should be killed

（编辑：李大同）

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