rabbitmq连接池golang实现
rabbitmq channel池实现，采用单条连接，IO多路复用方式，rabbitmq channel池和我们普通连接池的实现方式稍有差别，不是建立多个tcp连接，而是使用channel pool的方式实现，性能很好，分享出来
使用连接池（创建多个TCP连接，每个TCP连接创建channel池）做了一下测试，结果和单连接channel池性能相差不大，发现没必要创建连接池；
| 序号 | 消息大小（byte） | 测试结果（s） |
|---|---|---|
| 1 | 85 | 41250 |
| 2 | 180 | 39805 |
| 3 | 225 | 44504 |
| 4 | 888 | 39092 |
测试环境：
系统：ubuntu 19.04
CPU： intel core i5-7500 CPU 3.4GHZ *4
内存：16G
硬盘：ST2000DM005-2CW102, SATA III
网卡：1000M
有个问题， channel池只是一个数组，假设获取channel的那个人没有用完，第二个人又接着用channel了 会有问题吧
出现断线重连后, 连接恢复成功并没重新消费队列
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