redis的C/C++ API

1. hiredis

这时redis自带的官方的C语言API。安装很简单：

# cd {redis-src}# cd deps/hiredis/# make# make install

现在hiredis已经被安装于/usr/local/include/hiredis/和/usr/local/lib/下。为了方便，设置一下头文件和lib文件的路径：

# vim ~/.bashrc#compile time, paths to search included headers, referenced libs;export C_INCLUDE_PATH=.:/usr/local/include/hiredis:$C_INCLUDE_PATHexport CPLUS_INCLUDE_PATH=.:/usr/local/include/hiredis:$CPLUS_INCLUDE_PATHexport LIBRARY_PATH=.:/usr/local/lib:$LIBRARY_PATH#runtime, paths to search referenced libs;export LD_LIBRARY_PATH=.:/usr/local/lib:$LD_LIBRARY_PATH

然后，就可以基于hiredis API开发客户端了。可是hiredis不支持集群。支持集群的API：

C++  https://github.com/eyjian/r3c

C++  https://github.com/zhengshuxin/acl

C    https://github.com/vipshop/hiredis-vip.git

这里简单测试一下hiredis-vip。

2. hiredis-vip:

hiredis-vip是基于hiredis的(事实上，它包含一个完整的hiredis)，在hiredis的基础上，提供了一套cluster版本的接口。

安装: 由于hiredis-vip包含了完整的hiredis，在安装hiredis-vip之前，先卸载前面安装的hiredis。

# rm -fr /usr/local/include/hiredis/# rm -f /usr/local/lib/libhiredis.*

安装hiredis-vip

# wget https://github.com/vipshop/hiredis-vip/archive/master.zip# unzip master.zip# cd hiredis-vip-master/# make# vim Makefile (更改INSTALL_LIBRARY_PATH，免得受系统环境变量LIBRARY_PATH影响)；INSTALL_LIBRARY_PATH=/usr/local/lib/hiredis-vip# make install

现在，头文件安装于/usr/local/include/hiredis-vip目录，包含hiredis.h，hircluster.h等；lib文件安装于/usr/local/lib/hiredis-vip目录，主要是libhiredis_vip.so；为了方便，设置一下头文件和lib文件的路径：

# vim ~/.bashrc#compile time, paths to search included headers, referenced libs;export C_INCLUDE_PATH=.:/usr/local/include/hiredis-vip:$C_INCLUDE_PATHexport CPLUS_INCLUDE_PATH=.:/usr/local/include/hiredis-vip:$CPLUS_INCLUDE_PATHexport LIBRARY_PATH=.:/usr/local/lib/hiredis-vip:$LIBRARY_PATH#runtime, paths to search referenced libs;export LD_LIBRARY_PATH=.:/usr/local/lib/hiredis-vip:$LD_LIBRARY_PATH

2.1 hiredis-vip sync API

#include<stdio.h>#include<hircluster.h>int main(){    redisClusterContext *cc = redisClusterConnect("127.0.0.1:7000,127.0.0.1:7001",HIRCLUSTER_FLAG_NULL);    if(cc == NULL || cc->err)    {        printf("connect error : %s\n", cc == NULL ? "NULL" : cc->errstr);        return -1;    }    int i;    redisReply* reply = NULL;    for(i=0; i<10000; i++)    {      //set      reply = redisClusterCommand(cc, "set key%d value%d", i, i);      if(reply == NULL)      {        printf("set key%d, reply is NULL, error info: %s\n", i, cc->errstr);        redisClusterFree(cc);        return -1;      }      printf("set key%d, reply:%s\n", i, reply->str);      freeReplyObject(reply);      //get      reply = redisClusterCommand(cc, "get key%d", i);      if(reply == NULL)      {        printf("get key%d, reply is NULL, error info: %s\n", i, cc->errstr);        redisClusterFree(cc);        return -1;      }      printf("get key%d, reply:%s\n", i, reply->str);      freeReplyObject(reply);    }    redisClusterFree(cc);    return 0;}

编译运行：

<pre name="code" class="plain"># gcc -lhiredis_vip sync.c# ./a.out......set key9998, reply:OKget key9998, reply:value9998set key9999, reply:OKget key9999, reply:value9999

2.2 hiredis-vipi async API

#include<stdio.h>#include<hircluster.h>#include<adapters/libevent.h>int all_count=0;void getCallback(redisClusterAsyncContext *acc, void *r, void *privdata){    redisReply *reply = r;    int count =  *(int*)privdata;    all_count ++;    if(all_count >= count)    {        redisClusterAsyncDisconnect(acc);    }}void connectCallback(const redisAsyncContext *c, int status){    if (status != REDIS_OK) {        printf("Error: %s\n", c->errstr);        return;    }    printf("Connected...\n");}void disconnectCallback(const redisAsyncContext *c, int status){    if (status != REDIS_OK) {        printf("Error: %s\n", c->errstr);        return;    }    printf("\nDisconnected...\n");}int main(int argc, char **argv){    int status;    struct event_base *base = event_base_new();    redisClusterAsyncContext *acc = redisClusterAsyncConnect("127.0.0.1:7001,127.0.0.1:7001",HIRCLUSTER_FLAG_NULL);    if (acc->err)    {        printf("Error: %s\n", acc->errstr);        return 1;    }    redisClusterLibeventAttach(acc,base);    redisClusterAsyncSetConnectCallback(acc,connectCallback);    redisClusterAsyncSetDisconnectCallback(acc,disconnectCallback);    int count = 10000;    int i;    for(i = 0; i < 10000; i ++)    {        status = redisClusterAsyncCommand(acc, getCallback, &count, "set %d %d", i, i);        if(status != REDIS_OK)        {            printf("error: %d %s\n", acc->err, acc->errstr);        }    }    event_base_dispatch(base);    return 0;}

编译运行：

# gcc -lhiredis_vip -levent async.c# ./a.outConnected...Connected...Connected...Disconnected...Disconnected...Disconnected...