ruby - 如何在 Rails 中发出异步 http 请求

Question

在我的 Rails 应用程序中，我需要向 3rd 方服务发出 http 请求，因为 http 请求是同步的，有时需要超过 20 秒才能从他们那里得到响应。

我只是向该服务推送一些数据，我不关心响应是什么，所以我想让请求异步，这样我的代码将继续执行而不会被阻塞。

我怎么能用 ruby​​ 做到这一点？

Answer 1

I need to make a http request...so my code will continue execution and not been blocked.

def some_action
  Thread.new do
    uri = URI('http://localhost:4567/do_stuff')
    Net::HTTP.post_form(uri, 'x' => '1', 'y' => '2')
  end

  puts "****Execution continues here--before the response is received."
end

这是一个可以用来测试它的 sinatra 应用程序:

1) $ gem install sinatra

2)

#my_sinatra_app.rb

require 'sinatra'

post '/do_stuff' do
  puts "received: #{params}" #Check the sinatra server window for the output.
  sleep 20  #Do some time consuming task.

  puts "Sending response..."
  "The result was: 30"   #The response(which the rails app ignores).
end

输出:

$ ruby my_sinatra_app.rb
== Sinatra (v1.4.6) has taken the stage on 4567 for development with backup from Thin
Thin web server (v1.6.4 codename Gob Bluth)
Maximum connections set to 1024
Listening on localhost:4567, CTRL+C to stop

received: {"x"=>"1", "y"=>"2"}
<20 second delay>
Sending response...

127.0.0.1 - - [11/Nov/2015:12:54:53 -0400] "POST /do_stuff HTTP/1.1" 200 18 20.0032

当您导航到 Rails 应用程序中的 some_action() 时，rails 服务器窗口将立即输出 ****Execution continues here--before received response.，sinatra服务器窗口会立即输出params散列，其中包含post请求中发送的数据。然后在延迟 20 秒后，sinatra 服务器窗口将输出 Sending response...。