C++ http服务

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1.需要使用c++提供http服务，本来想使用libevent，但是经过一番搜索后，发现了只需要引用2个文件的mongoose库。

官方文档：https://cesanta.com/docs/overview/intro.html

官方代码：https://github.com/cesanta/mongoose

2.相关代码

#include "HttpService.h"

struct mg_serve_http_opts HttpService::s_http_server_opts;

//请求事件处理

void HttpService::mgEvHandler(struct mg_connection *nc, int ev, void *p) {

    //处理request

    if (ev == MG_EV_HTTP_REQUEST) {

        struct http_message *msg = (struct http_message *)p;

        //body内容

        char* body = new char[msg->body.len + ];

        memset(body, , msg->body.len + );

        memcpy(body, msg->body.p, msg->body.len);

        //uri内容

        char* uri = new char[msg->uri.len + ];

        memset(uri, , msg->uri.len + );

        memcpy(uri, msg->uri.p, msg->uri.len);

        //返回body信息

        mgSendBody(nc, "body content");

        //返回下载文件

        //mgSendFile("相对于s_http_server_opts.document_root的文件路径");

        delete uri;

        delete body;

    }

}

//发送body信息

void HttpService::mgSendBody(struct mg_connection *nc, const char *content) {

    mg_send_head(nc, , strlen(content), "Content-Type: text/plain\r\nConnection: close");

    mg_send(nc, content, strlen(content));

    nc->flags |= MG_F_SEND_AND_CLOSE;

}

//发送文件，文件的位置是相对于s_http_server_opts.document_root的路径

void HttpService::mgSendFile(struct mg_connection *nc, struct http_message *hm, const char* filePath) {

    mg_http_serve_file(nc, hm, filePath, mg_mk_str("text/plain"), mg_mk_str(""));

}

//初始化并启动

bool HttpService::start(const char *port) {

    struct mg_mgr mgr;

    struct mg_connection *nc;

    mg_mgr_init(&mgr, NULL);

    printf("Starting web server on port %s\n", port);

    nc = mg_bind(&mgr, port, mgEvHandler);

    if (nc == NULL) {

        printf("Failed to create listener\n");

        return false;

    }

    // Set up HTTP server parameters

    mg_set_protocol_http_websocket(nc);

    s_http_server_opts.document_root = ".";  //文件相对路径 Serve current directory

    s_http_server_opts.enable_directory_listing = "yes";

    for (;;) {

        mg_mgr_poll(&mgr, ); //1s轮训一次

    }

    mg_mgr_free(&mgr);

    return true;

}