基于mongoose 的web server端

/*
* Copyright (c) 2014 Cesanta Software Limited
* All rights reserved
*/

#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) {
			char buf[100] = { 0 };
			memcpy(buf, hm->body.p,
				sizeof(buf) - 1 < hm->body.len ? sizeof(buf) - 1 : hm->body.len);
			printf("%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;
}

访问方式 http://127.0.0.1:8000/api/v1/sum 这个是无参数的访问方法 有参数的需要解析http头或者body