C/C++编程：使用cesanta/mongoose编写restful服务

项目地址

https://github.com/cesanta/mongoose

使用的编辑器

CLion

项目一

新建项目umtitled，项目目录如下：

其中mongoose.cpp，和mongoose.h都是我从https://github.com/cesanta/mongoose扒下来的。基本上引入这两个就行了

内容分别为：

mongoose.cpp【部分】

/*
 * Copyright (c) 2004-2013 Sergey Lyubka
 * Copyright (c) 2013-2020 Cesanta Software Limited
 * All rights reserved
 *
 * This software is dual-licensed: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. For the terms of this
 * license, see .
 *
 * You are free to use this software under the terms of the GNU General
 * Public License, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * Alternatively, you can license this software under a commercial
 * license, as set out in .
 */

#include "../include/mongoose.h"
#ifdef MG_MODULE_LINES
#line 1 "mongoose/src/mg_internal.h"
#endif

#ifndef CS_MONGOOSE_SRC_INTERNAL_H_
#define CS_MONGOOSE_SRC_INTERNAL_H_

/* Amalgamated: #include "common/mg_mem.h" */

#ifndef MBUF_REALLOC
#define MBUF_REALLOC MG_REALLOC
#endif

#ifndef MBUF_FREE
#define MBUF_FREE MG_FREE
#endif

#define MG_SET_PTRPTR(_ptr, _v) \
  do {                          \
    if (_ptr) *(_ptr) = _v;     \
  } while (0)

#ifndef MG_INTERNAL
#define MG_INTERNAL static
#endif

#ifdef PICOTCP
#define NO_LIBC
#define MG_DISABLE_PFS
#endif

/* Amalgamated: #include "common/cs_dbg.h" */
/* Amalgamated: #include "mg_http.h" */
/* Amalgamated: #include "mg_net.h" */

#ifndef MG_CTL_MSG_MESSAGE_SIZE
#define MG_CTL_MSG_MESSAGE_SIZE 8192
#endif

/* internals that need to be accessible in unit tests */
MG_INTERNAL struct mg_connection *mg_do_connect(struct mg_connection *nc,
                                                int proto,
                                                union socket_address *sa);

MG_INTERNAL int mg_parse_address(const char *str, union socket_address *sa,
                                 int *proto, char *host, size_t host_len);
MG_INTERNAL void mg_call(struct mg_connection *nc,
                         mg_event_handler_t ev_handler, void *user_data, int ev,
                         void *ev_data);
void mg_forward(struct mg_connection *from, struct mg_connection *to);
MG_INTERNAL void mg_add_conn(struct mg_mgr *mgr, struct mg_connection *c);
MG_INTERNAL void mg_remove_conn(struct mg_connection *c);
MG_INTERNAL struct mg_connection *mg_create_connection(
    struct mg_mgr *mgr, mg_event_handler_t callback,
    struct mg_add_sock_opts opts);
#ifdef _WIN32
/* Retur value is the same as for MultiByteToWideChar. */
int to_wchar(const char *path, wchar_t *wbuf, size_t wbuf_len);
#endif

struct ctl_msg {
  mg_event_handler_t callback;
  char message[MG_CTL_MSG_MESSAGE_SIZE];
};

#if MG_ENABLE_MQTT
struct mg_mqtt_message;

#define MG_MQTT_ERROR_INCOMPLETE_MSG -1
#define MG_MQTT_ERROR_MALFORMED_MSG -2

MG_INTERNAL int parse_mqtt(struct mbuf *io, struct mg_mqtt_message *mm);
#endif

/* Forward declarations for testing. */
extern void *(*test_malloc)(size_t size);
extern void *(*test_calloc)(size_t count, size_t size);

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif

#if MG_ENABLE_HTTP
struct mg_serve_http_opts;

MG_INTERNAL struct mg_http_proto_data *mg_http_create_proto_data(
    struct mg_connection *c);

/*
 * Reassemble the content of the buffer (buf, blen) which should be
 * in the HTTP chunked encoding, by collapsing data chunks to the
 * beginning of the buffer.
 *
 * If chunks get reassembled, modify hm->body to point to the reassembled
 * body and fire MG_EV_HTTP_CHUNK event. If handler sets MG_F_DELETE_CHUNK
 * in nc->flags, delete reassembled body from the mbuf.
 *
 * Return reassembled body size.
 */

***

mongoose.h【部分】

/*
 * Copyright (c) 2004-2013 Sergey Lyubka
 * Copyright (c) 2013-2020 Cesanta Software Limited
 * All rights reserved
 *
 * This software is dual-licensed: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation. For the terms of this
 * license, see .
 *
 * You are free to use this software under the terms of the GNU General
 * Public License, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * Alternatively, you can license this software under a commercial
 * license, as set out in .
 */

#ifdef MG_MODULE_LINES
#line 1 "mongoose/src/mg_common.h"
#endif
#ifndef CS_MONGOOSE_SRC_COMMON_H_
#define CS_MONGOOSE_SRC_COMMON_H_

#define MG_VERSION "6.18"

/* Local tweaks, applied before any of Mongoose's own headers. */
#ifdef MG_LOCALS
#include 
#endif

#endif /* CS_MONGOOSE_SRC_COMMON_H_ */
#ifdef MG_MODULE_LINES
#line 1 "common/platform.h"
#endif
#ifndef CS_COMMON_PLATFORM_H_
#define CS_COMMON_PLATFORM_H_

main.cpp

#include 
#include 
#include 
#include 

#include "include/mongoose.h"



static const char *s_http_port = "8000";
static struct mg_serve_http_opts s_http_server_opts;

static void handle_sum_call(struct mg_connection *nc, struct http_message *hm) {
    char n1[100], n2[100];
    double result;

    /* Get form variables */
    mg_get_http_var(&hm->body, "n1", n1, sizeof(n1));
    mg_get_http_var(&hm->body, "n2", n2, sizeof(n2));

    /* Send headers */
    mg_printf(nc, "%s", "HTTP/1.1 200 OK\r\nTransfer-Encoding: chunked\r\n\r\n");

    /* Compute the result and send it back as a JSON object */
    result = strtod(n1, NULL) + strtod(n2, NULL);
    mg_printf_http_chunk(nc, "{ \"result\": %lf }", result);
    mg_send_http_chunk(nc, "", 0); /* Send empty chunk, the end of response */
}

static void ev_handler(struct mg_connection *nc, int ev, void *ev_data) {
    struct http_message *hm = (struct http_message *) ev_data;

    switch (ev) {
        case MG_EV_HTTP_REQUEST:
            if (mg_vcmp(&hm->uri, "/api/v1/sum") == 0) {
                handle_sum_call(nc, hm); /* Handle RESTful call */
            } else if (mg_vcmp(&hm->uri, "/printcontent") == 0) {
                printf("-------------------------------%zu", hm->body.len);
                char buf[100] = {0};
                memcpy(buf, hm->body.p,
                       sizeof(buf) - 1 < hm->body.len ? sizeof(buf) - 1 : hm->body.len);
                printf("aaaaaaaaaaaaaaaaaaaaaaaa%s\n", buf);
            } else {
                mg_serve_http(nc, hm, s_http_server_opts); /* Serve static content */
            }
            break;
        default:
            break;
    }
}

int main(int argc, char *argv[]) {
    struct mg_mgr mgr;
    struct mg_connection *nc;
    struct mg_bind_opts bind_opts;
    int i;
    char *cp;
    const char *err_str;
#if MG_ENABLE_SSL
    const char *ssl_cert = NULL;
#endif

    mg_mgr_init(&mgr, NULL);

    /* Use current binary directory as document root */
    if (argc > 0 && ((cp = strrchr(argv[0], DIRSEP)) != NULL)) {
        *cp = '\0';
        s_http_server_opts.document_root = argv[0];
    }

    /* Process command line options to customize HTTP server */
    for (i = 1; i < argc; i++) {
        if (strcmp(argv[i], "-D") == 0 && i + 1 < argc) {
            mgr.hexdump_file = argv[++i];
        } else if (strcmp(argv[i], "-d") == 0 && i + 1 < argc) {
            s_http_server_opts.document_root = argv[++i];
        } else if (strcmp(argv[i], "-p") == 0 && i + 1 < argc) {
            s_http_port = argv[++i];
        } else if (strcmp(argv[i], "-a") == 0 && i + 1 < argc) {
            s_http_server_opts.auth_domain = argv[++i];
        } else if (strcmp(argv[i], "-P") == 0 && i + 1 < argc) {
            s_http_server_opts.global_auth_file = argv[++i];
        } else if (strcmp(argv[i], "-A") == 0 && i + 1 < argc) {
            s_http_server_opts.per_directory_auth_file = argv[++i];
        } else if (strcmp(argv[i], "-r") == 0 && i + 1 < argc) {
            s_http_server_opts.url_rewrites = argv[++i];
#if MG_ENABLE_HTTP_CGI
            } else if (strcmp(argv[i], "-i") == 0 && i + 1 < argc) {
            s_http_server_opts.cgi_interpreter = argv[++i];
#endif
#if MG_ENABLE_SSL
            } else if (strcmp(argv[i], "-s") == 0 && i + 1 < argc) {
      ssl_cert = argv[++i];
#endif
        } else {
            fprintf(stderr, "Unknown option: [%s]\n", argv[i]);
            exit(1);
        }
    }

    /* Set HTTP server options */
    memset(&bind_opts, 0, sizeof(bind_opts));
    bind_opts.error_string = &err_str;
#if MG_ENABLE_SSL
    if (ssl_cert != NULL) {
    bind_opts.ssl_cert = ssl_cert;
  }
#endif
    nc = mg_bind_opt(&mgr, s_http_port, ev_handler, bind_opts);
    if (nc == NULL) {
        fprintf(stderr, "Error starting server on port %s: %s\n", s_http_port,
                *bind_opts.error_string);
        exit(1);
    }

    mg_set_protocol_http_websocket(nc);
    s_http_server_opts.enable_directory_listing = "yes";

    printf("Starting RESTful server on port %s, serving %s\n", s_http_port,
           s_http_server_opts.document_root);
    for (;;) {
        mg_mgr_poll(&mgr, 1000);
    }
    mg_mgr_free(&mgr);

    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.16)
project(untitled)

set(CMAKE_CXX_STANDARD 11)

add_executable(untitled main.cpp mongoose.cpp)

编译&运行

在CMakeLists.txt同级目录下执行命令：cmake .，make
发现生成一个untiled，执行命令：./untitiled

测试请求