ruby-on-rails – 访问rails线程中的变量

代码看起来正确.我想看看你是如何实例化它的.

在config / application.rb中,您可能至少有类似的东西：

require 'ws_communication'
config.middleware.use WsCommunication

然后,在您的JavaScript客户端中,您应该具有以下内容：

var ws = new WebSocket(uri);

您是否实例化了WsCommunication的另一个实例？这会将@clients设置为空数组并显示您的症状.这样的事情是不正确的：

var ws = new WsCommunication;

如果您要显示客户端,或者可能是config / application.rb,如果此帖子没有帮助,它将对我们有所帮助.

顺便说一句,我同意@clients应该在任何更新上受互斥锁保护的评论,如果不是也读取的话.它是一个动态结构,可以在事件驱动的系统中随时改变. redis-mutex是个不错的选择. (希望链接是正确的,因为Github目前似乎在所有内容上都丢失了500个错误.)

您可能还注意到$redis.publish返回接收消息的客户端数量的整数值.

最后,您可能会发现在终止之前需要确保您的频道已取消订阅.我遇到的情况是,由于早期订阅了未清理的同一频道,我最终发送了多个,甚至很多次的每条消息.由于您在线程中订阅了频道,因此您需要在同一个线程中取消订阅,否则进程将“挂起”等待正确的线程神奇地出现.我通过设置“取消订阅”标志然后发送消息来处理这种情况.然后,在on.message块中,我测试unsubscribe标志并在那里发出取消订阅.

您提供的模块,只需进行少量调试修改：

require 'faye/websocket'
require 'redis'

class WsCommunication
  KEEPALIVE_TIME = 15 #seconds
  CHANNEL = 'vip-deck'

  def initialize(app)
    @app = app
    @clients = []
    uri = URI.parse(ENV['REDISCLOUD_URL'])
    $redis = Redis.new(host: uri.host,password: uri.password)
    Thread.new do
      redis_sub = Redis.new(host: uri.host,msg|
          puts "Message event. Clients receiving:#{@clients.count};"
          @clients.each { |ws| ws.send(msg) }
        end
      end
    end
  end

  def call(env)
    if Faye::WebSocket.websocket?(env)
      ws = Faye::WebSocket.new(env,{ping: KEEPALIVE_TIME})

      ws.on :open do |event|
        @clients << ws
        puts "Open event. Clients open:#{@clients.count};"
      end

      ws.on :message do |event|
        receivers = $redis.publish(CHANNEL,event.data)
        puts "Message published:#{event.data}; Receivers:#{receivers};"
      end

      ws.on :close do |event|
        @clients.delete(ws)
        puts "Close event. Clients open:#{@clients.count};"
        ws = nil
      end

      ws.rack_response
    else
      @app.call(env)
    end
  end
end

我提供的测试用户代码：

# encoding: UTF-8
puts "Starting client-subscriber.rb"
$:.unshift File.expand_path '../lib',File.dirname(__FILE__)
require 'rubygems'
require 'eventmachine'
require 'websocket-client-simple'

puts "websocket-client-simple v#{WebSocket::Client::Simple::VERSION}"

url = ARGV.shift || 'ws://localhost:3000'

EM.run do

  ws = WebSocket::Client::Simple.connect url

  ws.on :message do |msg|
    puts msg
  end

  ws.on :open do
    puts "-- Subscriber open (#{ws.url})"
  end

  ws.on :close do |e|
    puts "-- Subscriber close (#{e.inspect})"
    exit 1
  end

  ws.on :error do |e|
    puts "-- Subscriber error (#{e.inspect})"
  end

end

我提供的测试发布者代码.发布者和订阅者可以轻松组合,因为这些只是测试：

# encoding: UTF-8
puts "Starting client-publisher.rb"
$:.unshift File.expand_path '../lib',File.dirname(__FILE__)
require 'rubygems'
require 'eventmachine'
require 'json'
require 'websocket-client-simple'

puts "websocket-client-simple v#{WebSocket::Client::Simple::VERSION}"

url = ARGV.shift || 'ws://localhost:3000'

EM.run do
  count ||= 0
  timer = EventMachine.add_periodic_timer(5+rand(5)) do
    count += 1
    send({"MESSAGE": "COUNT:#{count};"})
  end

  @ws = WebSocket::Client::Simple.connect url

  @ws.on :message do |msg|
    puts msg
  end

  @ws.on :open do
    puts "-- Publisher open"
  end

  @ws.on :close do |e|
    puts "-- Publisher close (#{e.inspect})"
    exit 1
  end

  @ws.on :error do |e|
    puts "-- Publisher error (#{e.inspect})"
    @ws.close
  end

  def self.send message
    payload = message.is_a?(Hash) ? message : {payload: message}
    @ws.send(payload.to_json)
  end
end

一个示例config.ru,它在机架中间件层运行所有这些：

require './controllers/main'
require './middlewares/ws_communication'
use WsCommunication
run Main.new

这是主要的.我把它从我正在运行的版本中删除了,所以如果你使用它可能需要调整它：

%w(rubygems bundler sinatra/base json erb).each { |m| require m }
ENV['RACK_ENV'] ||= 'development'
Bundler.require
$: << File.expand_path('../',__FILE__)
$: << File.expand_path('../lib',__FILE__)

Dir["./lib/*.rb","./lib/**/*.rb"].each { |file| require file }
env = ENV['OS'] == 'Windows_NT' ? 'development' : ENV['RACK_ENV']

  class Main < Sinatra::Base

    env = ENV['OS'] == 'Windows_NT' ? 'development' : ENV['RACK_ENV']
    get "/" do
      erb :"index.html"
    end

    get "/assets/js/application.js" do
      content_type :js
      @scheme = env == "production" ? "wss://" : "ws://"
      erb :"application.js"
    end
  end