Redmine中消息主动推送的实现方法

该方法能够实现在创建问题以及更改任务承担人时主动推送消息，不过需要借助相关消息总线，我这里使用的是rabbitmq;

一、创建一个
RabbitMQ 生产者。我们称之为发布者。我们将使用 bunny 这个超易用的 RabbitMQ Ruby 客户端。

1、在Gemfile中添加如下行，文件路径为：/opt/redmine/redmine-2.6.7/Gemfile ：

gem "bunny"

2、运行如下命令完成插件安装：
bundle
install
或者
apt-get install ruby-bunny

3、新建文件：app/models/publisher.rb

class Publisher  # In order to publish message we need a exchange name.  # Note that RabbitMQ does not care about the payload -  # we will be using JSON-encoded strings  def self.publish( message = {})    # grab the fanout exchange    x = channel.fanout("task")    # and simply publish message    x.publish(message.to_json)  end
def self.channel    @channel ||= connection.create_channel  end
# We are using default settings here  # The `Bunny.new(...)` is a place to  # put any specific RabbitMQ settings  # like host or port  def self.connection    @connection ||= Bunny.new('amqp://admin:admin@192.168.1.101:5672/todo').tap do |c|      c.start    end  endend

4、调整系统创建问题时调用 Publisher.publish，修改: app/controllers/issues_controller.rb文件:
1、在
create方法下添加行：

if @issue.save

#########ADD#########
if @issue.assigned_to_id

send_message("192.168.1.100", "create")

end

#########END#########
call_hook(:controller_issues_new_after_save, { :params => params, :issue => @issue})

......

2、在update方法下添加如下行：
def update

##########ADD##########

orign = @issue.assigned_to_id

##########END##########

return unless update_issue_from_params

......

if saved

##########ADD##########

now = @issue.assigned_to_id

if (now and (orign != now))

send_message("192.168.1.100", "update")

end

##########END##########

render_attachment_warning_if_needed(@issue)

......
3、在文档中定义相应函数：

def send_message(ip, action)

@issue["host"] = ip

@issue["action"] = action

@issue["login_name"] = User.find_by_id(@issue.assigned_to_id)['login']

@issue["project_name"] = Project.find(@issue.project_id)['name']

Publisher.publish(@issue)

end

二、我们需责成 blog.posts 交换将收到的消息发送给dashboard.posts 队列。尽管这个操作可以在
RabbitMQ 管理页面完成，但是我们最好将此操作做成可被自动执行
（比如，部署时自动执行）的配置文件的形式。我们还是使用
bunny 库。

1、新建 /opt/redmine/redmine-2.6.7/Rakefile 文件：

# Rakefile
namespace :rabbitmq do
desc "Setup routing"
task :setup do
require "bunny"

conn = Bunny.new('amqp://admin:admin@192.168.1.101:5672/task')
conn.start

ch = conn.create_channel

# get or create exchange
x = ch.fanout("task")

# get or create queue (note the durable setting)
queue = ch.queue("task_queue", durable: true)

# bind queue to exchange
queue.bind("task")

conn.close
end
end

2、运行：

rake rabbitmq:setup

3、修改 /etc/rc.local 文件，添加如下行，让命令开机自启动：

/usr/local/bin/rake rabbitmq:setup -f /opt/redmine/redmine-2.6.7/Rakefile

三、接收测试代码：

#!/usr/bin/env python
#-*-
coding: utf-8 -*-

import pika

parameters = pika.URLParameters('amqp://admin:admin@192.168.1.101:5672/task')
connection = pika.BlockingConnection(parameters)
channel = connection.channel()

#定义交换机
channel.exchange_declare(exchange='task', type='fanout')

#定义队列
channel.queue_declare(queue='task_queue', durable=True)
print ' [*] Waiting for n'

#绑定队列
channel.queue_bind(exchange='task', queue='task_queue')

def callback(ch, method, properties, body):
print '----->', body
ch.basic_ack(delivery_tag = method.delivery_tag)

channel.basic_qos(prefetch_count=1)
channel.basic_consume(callback, queue='task_queuee', no_ack=False)

print ' [*] Waiting for messages. To exit press CTRL+C'
try:
channel.start_consuming()
except KeyboardInterrupt:
channel.stop_consuming()
connection.close()