C++ http服务

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 + 1];
        memset(body, 0, msg->body.len + 1);
        memcpy(body, msg->body.p, msg->body.len);

        //uri内容
        char* uri = new char[msg->uri.len + 1];
        memset(uri, 0, msg->uri.len + 1);
        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, 200, strlen(content), "Content-Type: text/plain
Connection: 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
", port);
    nc = mg_bind(&mgr, port, mgEvHandler);
    if (nc == NULL) {
        printf("Failed to create listener
");
        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, 1000); //1s轮训一次
    }
    mg_mgr_free(&mgr);

    return true;
}

3.vs2019项目工程文件下载：vs2019_HttpSvr.zip

以上。