使用 sinatra 流 API 的异步请求 [英] async requests using sinatra streaming API

问题描述

我使用 async_sinatra gem 来实现异步路由，但我在某处看到一篇帖子说 Sinatra 的流 API 可以用来代替 async_sinatra 用于此目的.是否可以使用流式传输实现与以下相同的功能?

I use async_sinatra gem to implement asynchronous routes, but I came across a post somewhere that said that Sinatra's streaming API can be used instead of async_sinatra for this purpose. Can the same functionality as below be implemented using streaming?

require 'em-hiredis'
require 'sinatra/async'

class App < Sinatra::Base
  register Sinatra::Async

  def redis
    @redis ||= EM::Hiredis.connect
  end

  aget '/' do
    redis.blpop('abcdef', 15).
      callback {|x| body "x=#{x}"}.
      errback {|e| body "e=#{e}"}
  end

  run! if app_file == $0
end

推荐答案

回答我自己的问题:

require 'em-hiredis'
require 'sinatra/base'

class App < Sinatra::Base
  def redis
    @redis ||= EM::Hiredis.connect
  end

  get '/' do
    stream :keep_open do |out|
      redis.blpop('abcdef', 15).callback do |x|
        out << "x=#{x}"
        out.close
      end.errback do |e|
        out << "e=#{e}"
        out.close
      end
    end
  end

  run! if app_file == $0
end

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