基于Hiredis异步API的聊天系统实现
基于Hiredis异步API的聊天系统实现 上一篇文章http://blog.csdn.net/qq_34788352/article/details/51313027使用Hiredis的同步API实现了发送消息的客户端,当我使用同步API实现订阅频道客户端时,一旦订阅频道,就会出现无法操作的情况,这是就是同步和异步的
基于Hiredis异步API的聊天系统实现
上一篇文章http://blog.csdn.net/qq_34788352/article/details/51313027使用Hiredis的同步API实现了发送消息的客户端,当我使用同步API实现订阅频道客户端时,一旦订阅频道,就会出现无法操作的情况,这是就是同步和异步的问题。使用同步API,订阅频道后,客户端会进入阻塞状态,等待订阅频道发布的消息,不能实现既订阅频道,又能发布消息的功能。为了实现一个客户端既能订阅频道,又能发布消息的功能,就需要使用Hiredis的异步API。
首先特别感谢黄天霸、tickTick、vah101,当我遇到各种各样奇怪问题的时候,你们的帖子给与了我解答,谢谢。
开始正题,hiredis异步的实现主要是依靠redis自带的ae事件库或者libev事件库或者libevent的事件库或者libuv事件库。网上一些人是通过libevent事件库来实现,本系统则使用Redis自带ae事件库来实现,Redis不用libevent事件库而选择重写一个ae事件库,必定有其道理。
首先介绍使用到的异步API,位于async.h中:
<code class=" hljs perl">redisAsyncContext <span class="hljs-variable">*redisAsyncConnect</span>(const char <span class="hljs-variable">*ip</span>, <span class="hljs-keyword">int</span> port); <span class="hljs-regexp">//</span>用于建立异步连接 <span class="hljs-keyword">int</span> redisAsyncSetConnectCallback(redisAsyncContext <span class="hljs-variable">*ac</span>, redisConnectCallback <span class="hljs-variable">*fn</span>); <span class="hljs-regexp">//</span>设置连接回调函数,回调函数形式:void callback(const redisAsyncContext <span class="hljs-variable">*c</span>, <span class="hljs-keyword">int</span> status); <span class="hljs-keyword">int</span> redisAsyncSetDisconnectCallback(redisAsyncContext <span class="hljs-variable">*ac</span>, redisDisconnectCallback <span class="hljs-variable">*fn</span>); <span class="hljs-regexp">//</span>设置断开连接回调函数,回调函数形式:void callback(const redisAsyncContext <span class="hljs-variable">*c</span>, <span class="hljs-keyword">int</span> status); void redisAsyncDisconnect(redisAsyncContext <span class="hljs-variable">*ac</span>); <span class="hljs-regexp">//</span>断开异步连接 void redisAsyncFree(redisAsyncContext <span class="hljs-variable">*ac</span>); <span class="hljs-regexp">//</span>释放建立连接时,创建的redisAsyncContext结构 <span class="hljs-keyword">int</span> redisAsyncCommand(redisAsyncContext <span class="hljs-variable">*ac</span>, redisCallbackFn <span class="hljs-variable">*fn</span>, void <span class="hljs-variable">*privdata</span>, const char <span class="hljs-variable">*format</span>, ...); <span class="hljs-regexp">//</span>发送Redis命令,需要实现一个回调函数来出来命令的返回,fn是回调函数的地址,回调函数形式:void callback(redisAsyncContext <span class="hljs-variable">*c</span>, void <span class="hljs-variable">*reply</span>, void <span class="hljs-variable">*pridata</span>); </code>
有了上面的异步API,就可以开始客户端的撰写。
首先封装订阅端
<code class=" hljs cpp"><span class="hljs-comment">//sub_client.h</span> <span class="hljs-preprocessor">#ifndef REDIS_SUB_CLIENT_H </span> <span class="hljs-preprocessor">#define REDIS_SUB_CLIENT_H </span> <span class="hljs-keyword">extern</span> <span class="hljs-string">"C"</span> { <span class="hljs-preprocessor">#include <stdlib.h> </span> <span class="hljs-preprocessor">#include <async.h> </span> <span class="hljs-preprocessor">#include <adapters/ae.h> </span> <span class="hljs-preprocessor">#include <unistd.h> </span> <span class="hljs-preprocessor">#include <pthread.h> </span> <span class="hljs-preprocessor">#include <semaphore.h> </span> } <span class="hljs-preprocessor">#include <string> </span> <span class="hljs-preprocessor">#include <vector> </span> <span class="hljs-keyword">using</span> <span class="hljs-keyword">namespace</span> <span class="hljs-built_in">std</span>; <span class="hljs-keyword">class</span> CRedisSubClient { <span class="hljs-keyword">public</span>: CRedisSubClient(); ~CRedisSubClient(); <span class="hljs-keyword">bool</span> init(); <span class="hljs-comment">//初始化,事件对象,信号量 </span> <span class="hljs-keyword">bool</span> uninit(); <span class="hljs-comment">//释放对象</span> <span class="hljs-keyword">bool</span> connect(); <span class="hljs-comment">//连接服务器</span> <span class="hljs-keyword">bool</span> disconnect(); <span class="hljs-comment">//断开服务器</span> <span class="hljs-comment">//订阅频道 </span> <span class="hljs-keyword">bool</span> subscribe(<span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &channel_name); <span class="hljs-keyword">private</span>: <span class="hljs-comment">// 下面三个回调函数供redis服务调用 </span> <span class="hljs-comment">// 连接回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> connect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status); <span class="hljs-comment">// 断开连接的回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> disconnect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status); <span class="hljs-comment">// 执行命令回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> command_callback(redisAsyncContext *redis_context, <span class="hljs-keyword">void</span> *reply, <span class="hljs-keyword">void</span> *privdata); <span class="hljs-comment">// 事件分发线程函数 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> *event_thread(<span class="hljs-keyword">void</span> *data); <span class="hljs-keyword">void</span> *event_proc(); <span class="hljs-keyword">private</span>: <span class="hljs-comment">// ae事件对象 </span> aeEventLoop *loop; <span class="hljs-comment">// 事件线程ID </span> pthread_t _event_thread; <span class="hljs-comment">// 事件线程的信号量 </span> sem_t _event_sem; <span class="hljs-comment">// hiredis异步对象 </span> redisAsyncContext *_redis_context; }; <span class="hljs-preprocessor">#endif </span> </code>
使用extern “C”是因为redis和hiredis都是c写的,当使用c++链接c代码生成的库中的函数时,会出现undefined reference的问题。
订阅端的实现
<code class=" hljs cpp"><span class="hljs-comment">//sub_client.cpp</span> <span class="hljs-preprocessor">#include <stddef.h> </span> <span class="hljs-preprocessor">#include <assert.h> </span> <span class="hljs-preprocessor">#include <string.h> </span> <span class="hljs-preprocessor">#include "sub_client.h" </span> <span class="hljs-keyword">using</span> <span class="hljs-keyword">namespace</span> <span class="hljs-built_in">std</span>; CRedisSubClient::CRedisSubClient():loop(<span class="hljs-number">0</span>), _event_thread(<span class="hljs-number">0</span>), _redis_context(<span class="hljs-number">0</span>) { } CRedisSubClient::~CRedisSubClient() { } <span class="hljs-keyword">bool</span> CRedisSubClient::init() { loop = aeCreateEventLoop(<span class="hljs-number">64</span>); <span class="hljs-comment">// 创建ae对象</span> <span class="hljs-keyword">if</span> (NULL == loop) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Create redis event failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-built_in">memset</span>(&_event_sem, <span class="hljs-number">0</span>, <span class="hljs-keyword">sizeof</span>(_event_sem)); <span class="hljs-keyword">int</span> ret = sem_init(&_event_sem, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>); <span class="hljs-comment">//初始化线程信号量</span> <span class="hljs-keyword">if</span> (ret != <span class="hljs-number">0</span>) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Init sem failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisSubClient::uninit() { loop = NULL; sem_destroy(&_event_sem); <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisSubClient::connect() { _redis_context = redisAsyncConnect(<span class="hljs-string">"127.0.0.1"</span>, <span class="hljs-number">6379</span>); <span class="hljs-comment">// 异步连接到redis服务器上,使用6380端口</span> <span class="hljs-keyword">if</span> (NULL == _redis_context) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Connect redis failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-keyword">if</span> (_redis_context->err) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Connect redis error: %d, %s\n"</span>, _redis_context->err, _redis_context->errstr); <span class="hljs-comment">// 输出错误信息 </span> <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } redisAeAttach(loop,_redis_context); <span class="hljs-comment">// 将事件绑定到redis context上,使redis的回调跟事件关联 </span> <span class="hljs-comment">// 创建事件处理线程 </span> <span class="hljs-keyword">int</span> ret = pthread_create(&_event_thread, <span class="hljs-number">0</span>, &CRedisSubscriber::event_thread, <span class="hljs-keyword">this</span>); <span class="hljs-keyword">if</span> (ret != <span class="hljs-number">0</span>) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Create event thread failed.\n"</span>); disconnect(); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-comment">// 设置连接回调,当异步调用连接后,服务器处理连接请求结束后调用,通知调用者连接的状态 </span> redisAsyncSetConnectCallback(_redis_context, &CRedisSubClient::connect_callback); <span class="hljs-comment">// 设置断开连接回调,当服务器断开连接后,通知调用者连接断开,调用者可以利用这个函数实现重连 </span> redisAsyncSetDisconnectCallback(_redis_context, &CRedisSubClient::disconnect_callback); <span class="hljs-comment">// 启动事件线程 </span> sem_post(&_event_sem); <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisSubClient::disconnect() { <span class="hljs-keyword">if</span> (_redis_context) { redisAsyncDisconnect(_redis_context); redisAsyncFree(_redis_context); _redis_context = NULL; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisSubClient::subscribe(<span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &channel_name) { <span class="hljs-keyword">int</span> ret = redisAsyncCommand(_redis_context, &CRedisSubscriber::command_callback, <span class="hljs-keyword">this</span>, <span class="hljs-string">"SUBSCRIBE %s"</span>, channel_name.c_str()); <span class="hljs-comment">//订阅一个频道</span> <span class="hljs-keyword">if</span> (REDIS_ERR == ret) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Subscribe command failed: %d\n"</span>, ret); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Subscribe success: %s\n"</span>, channel_name.c_str()); <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">void</span> CRedisSubClient::connect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status) { <span class="hljs-keyword">if</span> (status != REDIS_OK) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Error: %s\n"</span>, redis_context->errstr); } <span class="hljs-keyword">else</span> { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Redis connected!"</span>); } } <span class="hljs-keyword">void</span> CRedisSubClient::disconnect_callback( <span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status) { <span class="hljs-keyword">if</span> (status != REDIS_OK) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Error: %s\n"</span>, redis_context->errstr); } } <span class="hljs-comment">// 消息接收回调函数 </span> <span class="hljs-keyword">void</span> CRedisSubClient::command_callback(redisAsyncContext *redis_context, <span class="hljs-keyword">void</span> *reply, <span class="hljs-keyword">void</span> *privdata) { <span class="hljs-keyword">if</span> (NULL == reply || NULL == privdata) { <span class="hljs-keyword">return</span> ; } redisReply *redis_reply = <span class="hljs-keyword">reinterpret_cast</span><redisReply *>(reply); <span class="hljs-comment">// 订阅接收到的消息是一个带三元素的数组 </span> <span class="hljs-keyword">if</span> (redis_reply->type == REDIS_REPLY_ARRAY && redis_reply->elements == <span class="hljs-number">3</span>) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Recieve message:%s %s %s\n"</span>, redis_reply->element[<span class="hljs-number">0</span>]->str redis_reply->element[<span class="hljs-number">1</span>]->str redis_reply->element[<span class="hljs-number">2</span>]->str); } } <span class="hljs-keyword">void</span> *CRedisSubClient::event_thread(<span class="hljs-keyword">void</span> *data) { <span class="hljs-keyword">if</span> (NULL == data) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Error!\n"</span>); assert(<span class="hljs-keyword">false</span>); <span class="hljs-keyword">return</span> NULL; } CRedisSubClient *self_this = <span class="hljs-keyword">reinterpret_cast</span><CRedisSubClient *>(data); <span class="hljs-keyword">return</span> self_this->event_proc(); } <span class="hljs-keyword">void</span> *CRedisSubClient::event_proc() { sem_wait(&_event_sem); <span class="hljs-comment">//进行事件处理循环 </span> aeMain(loop); <span class="hljs-keyword">return</span> NULL; } </code>
发布端的封装:
<code class=" hljs cpp"><span class="hljs-comment">//pub_client.h</span> <span class="hljs-preprocessor">#ifndef REDIS_PUB_CLIENT_H </span> <span class="hljs-preprocessor">#define REDIS_PUB_CLIENT_H </span> <span class="hljs-keyword">extern</span> <span class="hljs-string">"C"</span> { <span class="hljs-preprocessor">#include <stdlib.h> </span> <span class="hljs-preprocessor">#include <async.h> </span> <span class="hljs-preprocessor">#include <adapters/ae.h> </span> <span class="hljs-preprocessor">#include <unistd.h> </span> <span class="hljs-preprocessor">#include <pthread.h> </span> <span class="hljs-preprocessor">#include <semaphore.h> </span> } <span class="hljs-preprocessor">#include <string> </span> <span class="hljs-preprocessor">#include <vector> </span> <span class="hljs-keyword">using</span> <span class="hljs-keyword">namespace</span> <span class="hljs-built_in">std</span>; <span class="hljs-keyword">class</span> CRedisPubClient { <span class="hljs-keyword">public</span>: CRedisPubClient(); ~CRedisPubClient(); <span class="hljs-keyword">bool</span> init(); <span class="hljs-comment">//初始化,事件对象,信号量 </span> <span class="hljs-keyword">bool</span> uninit(); <span class="hljs-comment">//释放对象</span> <span class="hljs-keyword">bool</span> connect(); <span class="hljs-comment">//连接服务器</span> <span class="hljs-keyword">bool</span> disconnect(); <span class="hljs-comment">//断开服务器</span> <span class="hljs-comment">//订阅频道 </span> <span class="hljs-keyword">bool</span> publish(<span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &channel_name, <span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &message); <span class="hljs-keyword">private</span>: <span class="hljs-comment">// 下面三个回调函数供redis服务调用 </span> <span class="hljs-comment">// 连接回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> connect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status); <span class="hljs-comment">// 断开连接的回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> disconnect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status); <span class="hljs-comment">// 执行命令回调 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> command_callback(redisAsyncContext *redis_context, <span class="hljs-keyword">void</span> *reply, <span class="hljs-keyword">void</span> *privdata); <span class="hljs-comment">// 事件分发线程函数 </span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> *event_thread(<span class="hljs-keyword">void</span> *data); <span class="hljs-keyword">void</span> *event_proc(); <span class="hljs-keyword">private</span>: <span class="hljs-comment">// ae事件对象 </span> aeEventLoop *loop; <span class="hljs-comment">// 事件线程ID </span> pthread_t _event_thread; <span class="hljs-comment">// 事件线程的信号量 </span> sem_t _event_sem; <span class="hljs-comment">// hiredis异步对象 </span> redisAsyncContext *_redis_context; }; <span class="hljs-preprocessor">#endif </span></code>
发布端的实现:
<code class=" hljs cpp"><span class="hljs-comment">//pub_client.cpp</span> <span class="hljs-preprocessor">#include <stddef.h> </span> <span class="hljs-preprocessor">#include <assert.h> </span> <span class="hljs-preprocessor">#include <string.h> </span> <span class="hljs-preprocessor">#include "pub_client.h" </span> <span class="hljs-keyword">using</span> <span class="hljs-keyword">namespace</span> <span class="hljs-built_in">std</span>; CRedisPubClient::CRedisPubClient():loop(<span class="hljs-number">0</span>), _event_thread(<span class="hljs-number">0</span>), _redis_context(<span class="hljs-number">0</span>) { } CRedisPubClient::~CRedisPubClient() { } <span class="hljs-keyword">bool</span> CRedisPubClient::init() { loop = aeCreateEventLoop(<span class="hljs-number">64</span>); <span class="hljs-comment">// 创建ae对象</span> <span class="hljs-keyword">if</span> (NULL == loop) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Create redis event failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-built_in">memset</span>(&_event_sem, <span class="hljs-number">0</span>, <span class="hljs-keyword">sizeof</span>(_event_sem)); <span class="hljs-keyword">int</span> ret = sem_init(&_event_sem, <span class="hljs-number">0</span>, <span class="hljs-number">0</span>); <span class="hljs-comment">//初始化线程信号量</span> <span class="hljs-keyword">if</span> (ret != <span class="hljs-number">0</span>) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Init sem failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisPubClient::uninit() { loop = NULL; sem_destroy(&_event_sem); <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisPubClient::connect() { _redis_context = redisAsyncConnect(<span class="hljs-string">"127.0.0.1"</span>, <span class="hljs-number">6379</span>); <span class="hljs-comment">// 异步连接到redis服务器上,使用6380端口</span> <span class="hljs-keyword">if</span> (NULL == _redis_context) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Connect redis failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-keyword">if</span> (_redis_context->err) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Connect redis error: %d, %s\n"</span>, _redis_context->err, _redis_context->errstr); <span class="hljs-comment">// 输出错误信息 </span> <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } redisAeAttach(loop,_redis_context); <span class="hljs-comment">// 将事件绑定到redis context上,使redis的回调跟事件关联 </span> <span class="hljs-comment">// 创建事件处理线程 </span> <span class="hljs-keyword">int</span> ret = pthread_create(&_event_thread, <span class="hljs-number">0</span>, &CRedisSubscriber::event_thread, <span class="hljs-keyword">this</span>); <span class="hljs-keyword">if</span> (ret != <span class="hljs-number">0</span>) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Create event thread failed.\n"</span>); disconnect(); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-comment">// 设置连接回调,当异步调用连接后,服务器处理连接请求结束后调用,通知调用者连接的状态 </span> redisAsyncSetConnectCallback(_redis_context, &CRedisSubClient::connect_callback); <span class="hljs-comment">// 设置断开连接回调,当服务器断开连接后,通知调用者连接断开,调用者可以利用这个函数实现重连 </span> redisAsyncSetDisconnectCallback(_redis_context, &CRedisSubClient::disconnect_callback); <span class="hljs-comment">// 启动事件线程 </span> sem_post(&_event_sem); <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisPubClient::disconnect() { <span class="hljs-keyword">if</span> (_redis_context) { redisAsyncDisconnect(_redis_context); redisAsyncFree(_redis_context); _redis_context = NULL; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">bool</span> CRedisPubClient::publish(<span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &channel_name, <span class="hljs-keyword">const</span> <span class="hljs-built_in">string</span> &message) { <span class="hljs-keyword">int</span> ret = redisAsyncCommand(_redis_context, &CRedisPublisher::command_callback, <span class="hljs-keyword">this</span>, <span class="hljs-string">"PUBLISH %s %s"</span>, channel_name.c_str(), message.c_str()); <span class="hljs-comment">//发布消息 </span> <span class="hljs-keyword">if</span> (REDIS_ERR == ret) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Publish command failed: %d\n"</span>, ret); <span class="hljs-keyword">return</span> <span class="hljs-keyword">false</span>; } <span class="hljs-keyword">return</span> <span class="hljs-keyword">true</span>; } <span class="hljs-keyword">void</span> CRedisPubClient::connect_callback(<span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status) { <span class="hljs-keyword">if</span> (status != REDIS_OK) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Error: %s\n"</span>, redis_context->errstr); } <span class="hljs-keyword">else</span> { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Redis connected!"</span>); } } <span class="hljs-keyword">void</span> CRedisPubClient::disconnect_callback( <span class="hljs-keyword">const</span> redisAsyncContext *redis_context, <span class="hljs-keyword">int</span> status) { <span class="hljs-keyword">if</span> (status != REDIS_OK) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Error: %s\n"</span>, redis_context->errstr); } } <span class="hljs-comment">// 消息接收回调函数 </span> <span class="hljs-keyword">void</span> CRedisPubClient::command_callback(redisAsyncContext *redis_context, <span class="hljs-keyword">void</span> *reply, <span class="hljs-keyword">void</span> *privdata) { <span class="hljs-keyword">if</span> (NULL == reply || NULL == privdata) { <span class="hljs-keyword">return</span> ; } redisReply *redis_reply = <span class="hljs-keyword">reinterpret_cast</span><redisReply *>(reply); <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Publish: %s"</span>,redis_reply.str); } <span class="hljs-keyword">void</span> *CRedisPubClient::event_thread(<span class="hljs-keyword">void</span> *data) { <span class="hljs-keyword">if</span> (NULL == data) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">": Error!\n"</span>); assert(<span class="hljs-keyword">false</span>); <span class="hljs-keyword">return</span> NULL; } CRedisPubClient *self_this = <span class="hljs-keyword">reinterpret_cast</span><CRedisPubClient *>(data); <span class="hljs-keyword">return</span> self_this->event_proc(); } <span class="hljs-keyword">void</span> *CRedisPubClient::event_proc() { sem_wait(&_event_sem); <span class="hljs-comment">//进行事件处理循环 </span> aeMain(loop); <span class="hljs-keyword">return</span> NULL; } </code>
测试封装的sub_client和pub_client类:
<code class=" hljs cpp"><span class="hljs-comment">//test_subpub.cpp</span> <span class="hljs-preprocessor">#include "pub_client.h"</span> <span class="hljs-preprocessor">#include "sub_client.h" </span> <span class="hljs-keyword">int</span> main(<span class="hljs-keyword">int</span> argc, <span class="hljs-keyword">char</span> *argv[]) { CRedisPubClient publisher; CRedisSubClient subcriber; <span class="hljs-keyword">bool</span> ret_pub = publisher.init(); <span class="hljs-keyword">bool</span> ret_sub = subcriber.init(); <span class="hljs-keyword">if</span> (!ret_sub&&!ret_pub) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"Init failed.\n"</span>); <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>; } ret_pub = publisher.connect(); ret_sub = subcriber.connect(); <span class="hljs-keyword">if</span> (!ret_sub&&!ret_pub) { <span class="hljs-built_in">printf</span>(<span class="hljs-string">"connect failed."</span>); <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>; } subscriber.subcribe(<span class="hljs-string">"sports"</span>); <span class="hljs-keyword">while</span> (<span class="hljs-keyword">true</span>) { publisher.publish(<span class="hljs-string">"sports"</span>, <span class="hljs-string">"ball"</span>); sleep(<span class="hljs-number">1</span>); } publisher.disconnect(); publisher.uninit(); subscriber.disconnect(); subscriber.disconnect(); <span class="hljs-keyword">return</span> <span class="hljs-number">0</span>; } </code>
终于到了编译链接运行的阶段,我在这个地方卡了快一天,期间各种编译、链接的错误。直接编译链接会出现找到不aeCreateFileEvent,aeDeleteFileEvent,aeMain等等错误。
- 先将redis/src文件夹中的ae.c,ae.h,ae_epoll.c,config.h,zmalloc.c,zmalloc.h拷贝至hiredis目录下
- 用gcc -c ae.c gcc -c zmalloc.c生成ae.o和zmalloc.o,利用这两个文件生成静态库 ar -r libar.a ae.o zmalloc.o
- 然后编译g++ -o test_subpub test_subpub.cpp pub_client.cpp sub_client.cpp -pthread -I ../ -I./ -I ../adapters ../libhiredis.a ../libae.a
- 运行./test_subpub
可以看到,客户端中消息在不断地滚动,即同时实现了订阅频道和发送消息的功能。

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