Question

我有以下代码，它将查询特定字符串的twitter流API。当我用不同的查询打开两个选项卡时，它们都可以工作。但是，当我停止其中一个选项卡时，另一个选项卡停止接收任何数据，服务器停止处理该流。我该如何解决这个问题？

require 'sinatra'
require 'eventmachine'
require 'em-http'
require 'json'
require 'sinatra/streaming'

enable :logging, :dump_errors, :raise_errors

get '/test/:query' do
  q = params[:query]
  the = 'him'
  url = "https://stream.twitter.com/1/statuses/filter.json?track=#{q}"
  stream(:keep_open) do |out|   
    http = EM::HttpRequest.new(url)
    s = http.get :head => { 'Authorization' => [ 'USERNAME', 'PASSWORD' ] }
    out.callback do
      puts "callback"
      http.conn.close_connection
    end
    out.errback do 
      puts "errback"
      http.conn.close_connection
    end
    buffer = ""
    s.stream do |chunk|
      puts "what"
      buffer += chunk
      while line = buffer.slice!(/.+\r?\n/)
        tweet = JSON.parse(line)
        unless tweet.length == 0 or tweet['user'].nil? or out.closed?
          out << "<p><b>#{tweet['user']['screen_name']}</b>: #{tweet['text']}</p>" 
        end
      end
    end
  end
end

Answer 1

问题是，一旦打开第二个连接，Twitter就会关闭一个连接。尝试同时在两个终端中运行curl https://USER:PASSWORD@stream.twitter.com/1/statuses/filter.json?track=bar。

此外，在尝试找出问题的同时，我做了一个相当小的重构来提高可读性：

require 'sinatra'
require 'sinatra/streaming'
require 'eventmachine'
require 'em-http'
require 'json'

enable :logging, :dump_errors, :raise_errors
template(:tweet) { "<p><b><%= @tweet['user']['screen_name'] %></b>: <%= @tweet['text'] %></p>" }

get '/test/:query' do |q|
  stream(:keep_open) do |out|
    http = EM::HttpRequest.new("https://stream.twitter.com/1/statuses/filter.json?track=#{q}")

    EM.next_tick do
      s = http.get :head => { 'Authorization' => ENV.values_at('USERNAME', 'PASSWORD') }

      s.callback { out.close }
      out.callback { s.close }

      s.errback { out.close }
      out.errback { s.close }

      buffer = ""
      s.stream do |chunk|
        buffer << chunk
        while line = buffer.slice!(/.+\r?\n/)
          break if out.closed?
          @tweet = JSON.parse(line)
          out << erb(:tweet) if @tweet.length > 0 and @tweet['user']
        end
      end
    end
  end
end

在使用带有sinatra的eventmachine时，如何关闭一个http连接而不关闭它们？

1 个答案: