libevent的http服务与libjson结合

最近接收了一项任务，计划在linux下的app应用程序(c++)里面添加http服务支持，因为这个app应用程序，是用libevent写的，在看到libevent有自带的http服务模块后，打算直接就拿来使用了，基本技术特点如下：

• libevent+http
• json支持

闲话少说，贴出代码先

1，main.cpp，仅贴出部分代码

if (FAILED == CHttpMgr::CreateHttpServerThread())    {        LOG_ERROR("Create Http Server Thread Failed!");        return FAILED;    }

2，HttpMgr.h

//#ifndef _HTTPMGR_HH_#define _HTTPMGR_HH_#include "common.h"#include <event2/event.h>#include <event2/http.h>#include <event2/buffer.h>#include <event2/util.h>#include <event2/keyvalq_struct.h>#define GET_TARG_POSITION "/Target/GetPosition" //#define GET_TARG_POSITION_SIZE 19#define GET_TARG_BASICINFO "/Target/GetInfo"    //#define GET_TARG_BASICINFO_SIZE 15class CHttpMgr{public:    //创建http服务器线程    static int CreateHttpServerThread();    //libevent循环    static void* HttpServerWorkerLibevent(void* arg);    //接收http请求    static void dump_request_cb(struct evhttp_request *req, void *arg);    //处理http GET 请求    static void handle_request_get(struct  evhttp_request *req, void *arg);    //处理http POST 请求    static void handle_request_post(struct  evhttp_request *req, void *arg);    //业务解码    static int decode_get_targ_position(struct evkeyvalq *params, string &str);};

3，HttpMgr.cpp

#include "HttpMgr.h"#include "Util.h"#include <json/json.h>/*****************************************************************************   函数名称  :  CreateHttpServerThread   函数描述  :  创建http服务器线程   输出参数  :  N/A   返回值    :  int   备注      :  N/A*****************************************************************************/int CHttpMgr::CreateHttpServerThread(){    LOG_FUN;    struct event_base *base;    struct evhttp *http;    struct evhttp_bound_socket *handle;    unsigned short port = 8000;    base = event_base_new();    if (!base)    {        LOG_ERROR("event_base_new FAILED!");        return FAILED;    }    /* Create a new evhttp object to handle requests. */    http = evhttp_new(base);    if (!http)    {        LOG_ERROR("evhttp_new FAILED!");        return FAILED;    }    //仅接收"/Target"下的http请求    //evhttp_set_cb(http, "/Target", CHttpMgr::dump_request_cb, NULL);    //接收http任意请求    evhttp_set_gencb(http, CHttpMgr::dump_request_cb, NULL);    handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);    if (!handle)    {        LOG_ERROR("evhttp_bind_socket_with_handle FAILED!");        return FAILED;    }    //准备结束，启动循环线程    int iRet = 0;    pthread_t tidHttpServer;    if ((iRet = pthread_create(&tidHttpServer, NULL, CHttpMgr::HttpServerWorkerLibevent, base)))    {        LOG_ERROR("Create Http Server Thread Failed! -- %d", iRet);        return FAILED;    }    return SUCCESS;}/*****************************************************************************   函数名称  :  HttpServerWorkerLibevent   函数描述  :  libevent循环   输出参数  :  N/A   返回值    :  void*   备注      :  N/A*****************************************************************************/void* CHttpMgr::HttpServerWorkerLibevent(void* arg){    LOG_FUN;    struct event_base* pBase = static_cast<struct event_base*>(arg);    if (!pBase)    {        LOG_ERROR("Http Server thread arg FAILED!");        return NULL;    }    (void)event_base_loop(pBase, 0);    return NULL;}/*****************************************************************************   函数名称  :  dump_request_cb   函数描述  :  http请求处理函数   输出参数  :  N/A   返回值    :  void   备注      :  N/A*****************************************************************************/void CHttpMgr::dump_request_cb(struct evhttp_request *req, void *arg){    LOG_FUN;    const char *cmdtype;    switch (evhttp_request_get_command(req))    {        case EVHTTP_REQ_GET:         {            cmdtype = "GET";             LOG_DEBUG("CMD Type GET ");            handle_request_get(req, arg);            break;                  }        case EVHTTP_REQ_POST:         {            cmdtype = "POST";             LOG_DEBUG("CMD Type POST ");            handle_request_post(req, arg);            break;        }        case EVHTTP_REQ_HEAD: cmdtype = "HEAD"; LOG_DEBUG("CMD Type HEAD ");break;        case EVHTTP_REQ_PUT: cmdtype = "PUT"; LOG_DEBUG("CMD Type PUT ");break;        case EVHTTP_REQ_DELETE: cmdtype = "DELETE"; LOG_DEBUG("CMD Type DELETE ");break;        case EVHTTP_REQ_OPTIONS: cmdtype = "OPTIONS"; LOG_DEBUG("CMD Type OPTIONS "); break;        case EVHTTP_REQ_TRACE: cmdtype = "TRACE"; LOG_DEBUG("CMD Type TRACE ");break;        case EVHTTP_REQ_CONNECT: cmdtype = "CONNECT"; LOG_DEBUG("CMD Type CONNECT ");break;        case EVHTTP_REQ_PATCH: cmdtype = "PATCH"; LOG_DEBUG("CMD Type PATCH ");break;        default: cmdtype = "unknown"; LOG_DEBUG("CMD Type unknown ");break;    }}/*****************************************************************************   函数名称  :  handle_request_get   函数描述  :  Http Get请求处理函数   输出参数  :  N/A   返回值    :  void   备注      :  N/A*****************************************************************************/void CHttpMgr::handle_request_get(struct  evhttp_request *req, void *arg){    LOG_FUN;    struct evkeyvalq *headers;    struct evkeyvalq params;    struct evkeyval *header;    struct evbuffer *buf;    const char *uri;    string strOut="";//http 输出的码流    int CODE = HTTP_OK;    //获取请求的URI    uri = evhttp_request_get_uri(req);    LOG_DEBUG("Received a GET request for %s headers:",  uri);    //debug 信息输出{    headers = evhttp_request_get_input_headers(req);    for (header = headers->tqh_first; header; header = header->next.tqe_next)    {        LOG_DEBUG("%s :  %s", header->key, header->value);    }       //debug }    //参数查询    evhttp_parse_query(uri, &params);    //    if (0 == strncmp(uri, GET_TARG_POSITION, GET_TARG_POSITION_SIZE))    {        CODE = decode_get_targ_position(&params, strOut);    }    else if (0 == strncmp(uri, GET_TARG_BASICINFO, GET_TARG_BASICINFO_SIZE))    {        LOG_ERROR("Expand Get Target Info Interface, havn't implemented!");        CODE = HTTP_NOTIMPLEMENTED;        strOut.append("Get Target Info not implemented");    }    else    {        LOG_ERROR("Reserved!");        CODE = HTTP_NOTIMPLEMENTED;        strOut.append("not implemented");    }       buf = evbuffer_new();    evbuffer_add_printf(buf, "%s",strOut.c_str());    //http 应答       evhttp_send_reply(req, CODE, "OK", buf);    //释放资源    evhttp_clear_headers(&params);    evhttp_clear_headers(headers);    evbuffer_free(buf);}/*****************************************************************************   函数名称  :  handle_request_post   函数描述  :  Http POST请求处理函数   输出参数  :  N/A   返回值    :  void   备注      :  N/A*****************************************************************************/void CHttpMgr::handle_request_post(struct  evhttp_request *req, void *arg){    LOG_FUN;    LOG_ERROR("handle_request_post Reserved!");}int CHttpMgr::decode_get_targ_position(struct evkeyvalq *params, string &str){    LOG_FUN;    //JSON格式编码    Json::Value root;    Json::Value arrayObj;    root["resultCode"] = "0";    root["TargName"] = "Test";    root["Latitude"] = "30.12345";    root["Longitude"] = "102.1323";    root["dateTime"] = 1452052317;    str = root.toStyledString();    return HTTP_OK;}