在生产模式下在 Heroku 上使用 Faye

Question

Rails 4.1.1
Ruby2.1.1 接入点是https://pacific-savannah-8641.herokuapp.com

Gemfile

source 'https://rubygems.org'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.1'
# Use mysql as the database for Active Record
gem 'mysql2'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
# gem 'therubyracer',  platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0',          group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Use debugger
# gem 'debugger', group: [:development, :test]

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin]

gem 'slim-rails'
gem 'devise'
gem 'cancan'
gem 'rakismet'

gem 'carrierwave'
gem 'rmagick', :require => false
gem 'faker', '1.0.1'
gem 'jdbc-mysql', '5.1.28', :platform => :jruby
gem 'thinking-sphinx', '~> 3.1.0'
gem 'remotipart', '~> 1.2'
gem 'kaminari'
gem 'thin'
gem 'carrierwave-aws'

group :production do
  gem 'rails_12factor', '0.0.2'
end

gem 'foreman'
gem 'faye'

faye.ru

require 'faye'
Faye::WebSocket.load_adapter('thin')
faye_server = Faye::RackAdapter.new(:mount => '/faye', :timeout => 45)
run faye_server

application.html.slim

doctype html
html
  head
    title Help Desk App

    = stylesheet_link_tag    "application", media: "all", "data-turbolinks-track" => true
    = javascript_include_tag "application", "data-turbolinks-track" => true
    = javascript_include_tag  "http://localhost:9292/faye.js"

    = csrf_meta_tags
    ....

Procfile

worker: bundle exec foreman start -f Procfile.workers

Procfile.workers

faye_worker: rackup faye.ru -s thin -E production

app/assets/javascripts/main.js

$(function() {
  var faye = new Faye.Client('http://localhost:9292/faye');
  faye.subscribe('/posts/new', function (data) {
      eval(data);
  });  
}

app/helpers/application_helper.rb

module ApplicationHelper
  def broadcast(channel, &block)
    message = {:channel => channel, :data => capture(&block)}
    uri = URI.parse("http://localhost:9292/faye")
    Net::HTTP.post_form(uri, :message => message.to_json)  
  end
end

heroku ps

drobazko@drobazko:~/www/help_desk$ heroku ps
=== run: one-off processes
run.2182 (1X): up 2015/02/11 08:07:57 (~ 27m ago): `foreman start`

=== web (1X): `bin/rails server -p $PORT -e $RAILS_ENV`
web.1: up 2015/02/11 08:35:44 (~ -40s ago)

=== worker (1X): `bundle exec foreman start -f Procfile.workers`
worker.1: up 2015/02/11 08:35:42 (~ -38s ago)
worker.2: up 2015/02/11 08:35:39 (~ -35s ago)
worker.3: up 2015/02/11 08:35:40 (~ -37s ago)
worker.4: up 2015/02/11 08:35:39 (~ -36s ago)

我找不到 faye.js: 显然，引用 http://localhost:9292/faye.js 不可访问。

我试图找到 faye.js 但没有成功：

https://pacific-savannah-8641.herokuapp.com/faye.js
https://pacific-savannah-8641.herokuapp.com/faye
http://pacific-savannah-8641.herokuapp.com/faye
http://pacific-savannah-8641.herokuapp.com/faye.js
...http://pacific-savannah-8641.herokuapp.com:9292...

问题：

我应该如何替换 Heroku 生产中的引用 http://localhost:9292/faye 以使其正常工作？

Answer 1

我找到了解决方案。
要将 Faye 与 Heroku 一起使用而无需添加额外的 dynos（即免费），您应该将 Faye 作为中间件安装到您的应用程序中。
关键点是将特定行添加到 application.rb：

require File.expand_path('../boot', __FILE__)

require 'rails/all'
require 'net/http'

Bundler.require(*Rails.groups)

module Helpdesk
  class Application < Rails::Application
    config.middleware.delete Rack::Lock
    config.middleware.use FayeRails::Middleware, mount: '/faye', :timeout => 25
  end
end

此外，您应该添加 faye-rails gem：

gem 'faye-rails', '~> 2.0'

application.js 应该看起来像：

//= require jquery
//= require jquery.turbolinks
//= require jquery_ujs
//= require jquery.remotipart
//= require turbolinks
//= require faye
//= require_tree .

然后，我创建了 apps/assets/javascripts/realtime.js.coffee 来定义我将如何处理来自服务器的实时消息：

window.client = new Faye.Client('/faye')

jQuery ->
  client.subscribe '/comments', (payload) ->
    $('.ticket-' + payload.token + ' .no-posts').remove()

    $('<div></div>')
      .css({'backgroundColor' : '#ff9f5f'})
      .prependTo('.ticket-' + payload.token + ' .posts')
      .hide()
      .append(payload.message)
      .fadeIn('slow')
      .css({transition: 'background-color 3s ease-in-out', "background-color": "white"})

最后，这是我向所有订阅者发布消息的方式 app/views/posts/create。js.coffee：

publisher = client.publish('/comments', {
  message: '<%= j render @post %>',
  token: '<%= @ticket.token %>'
});

Procfile 应包含以下内容：

web: bundle exec rails server thin -p $PORT -e $RACK_ENV

您可以在 help_desk

上查看所有代码

在生产模式下在 Heroku 上使用 Faye

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