【小沐学C++】C++实现Web服务器（libevent，libcurl，libuv，poco）
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文章目录
- 1、简介
- 1.1 libevent
- 1.2 libcurl
- 1.3 openssl
- 1.4 cJSON
- 2、libevent
- 2.1 下载
- 2.2 VS2017编译
- 2.3 VS2008编译
- 2.4 代码测试（http服务端）
- 2.5 代码测试（http客户端）
- 3、libcurl
- 3.1 下载
- 3.2 编译
- 3.3 代码测试（http客户端）
- 3.4 命令行
- 4、poco
- 4.1 下载
- 4.2 编译
- 4.3 代码测试（http客户端）
- 4.4 代码测试（http服务端）
- 5、libuv
- 5.1 下载
- 5.2 编译
- 5.3 代码测试（http客户端、服务端）
- 结语
1、简介
1.1 libevent
官网地址：
https://libevent.org/
libevent - 一个事件通知库。
目前，libevent支持 /dev/poll、 kqueue(2)、 event ports、 POSIX select(2)、 Windows select()、 poll(2)和epoll(4)。内部事件机制完全独立于暴露的事件 API，简单更新 libevent 即可提供新功能，而无需重新设计应用程序。结果，Libevent允许可移植的应用程序开发，并提供操作系统上可用的最具可扩展性的事件通知机制。Libevent 也可以用于多线程应用程序，通过隔离每个 event_base 以便只有单个线程访问它，或者通过锁定对单个共享 event_base 的访问。 Libevent应该在 Linux、*BSD、Mac OS X、Solaris、Windows 等上编译。
Libevent 还为缓冲网络 IO 提供了一个复杂的框架，支持套接字、过滤器、速率限制、SSL、零拷贝文件传输和 IOCP。Libevent 包括对几个有用协议的支持，包括 DNS、HTTP 和最小的 RPC 框架。
1.2 libcurl
官网地址：
https://curl.se/libcurl/
libcurl - 多协议文件传输库.
libcurl 是一个免费且易于使用的客户端 URL 传输库，支持 DICT、FILE、FTP、FTPS、GOPHER、GOPHERS、HTTP、HTTPS、IMAP、IMAPS、LDAP、LDAPS、MQTT、POP3、POP3S、RTMP、 RTMPS、RTSP、SCP、SFTP、SMB、SMBS、SMTP、SMTPS、TELNET 和 TFTP。libcurl 支持 SSL 证书、HTTP POST、HTTP PUT、FTP 上传、基于 HTTP 表单的上传、代理、HTTP/2、HTTP/3、cookies、用户+密码认证（Basic、Digest、NTLM、Negotiate、Kerberos）、文件传输恢复，http代理隧道等等！
libcurl 是高度可移植的，它可以在多种平台上构建和工作，包括 Solaris、NetBSD、FreeBSD、OpenBSD、Darwin、HPUX、IRIX、AIX、Tru64、Linux、UnixWare、HURD、Windows、Amiga、OS/2、BeOs、Mac OS X、Ultrix、QNX、OpenVMS、RISC OS、Novell NetWare、DOS 等…
libcurl 是免费的、线程安全的、与 IPv6 兼容、功能丰富、支持良好、速度快、文档完整，并且已被许多知名、大型和成功的公司使用。
1.3 openssl
详细介绍请查看本人另外一篇文章：
https://blog.csdn.net/hhy321/article/details/125922276
1.4 cJSON
cJSON是一个使用C语言编写的JSON数据解析器，具有超轻便，可移植，单文件的特点，使用MIT开源协议。
https://github.com/DaveGamble/cJSON
- 从git下载源代码
- 源代码文件夹如下：
mkdir build
cd build
cmake ..
# or
cmake .. -DENABLE_CJSON_UTILS=On -DENABLE_CJSON_TEST=Off
- 生成的工程文件如下：
- 举例说明：
这里有一个json字符串如下：
{"name": "Awesome 4K","resolutions": [{"width": 1280,"height": 720},{"width": 1920,"height": 1080},{"width": 3840,"height": 2160}]
}
- 通过cJSON代码构建上面的json字符串如下：
//create a monitor with a list of supported resolutions
//NOTE: Returns a heap allocated string, you are required to free it after use.
char *create_monitor(void)
{const unsigned int resolution_numbers[3][2] = {{1280, 720},{1920, 1080},{3840, 2160}};char *string = NULL;cJSON *name = NULL;cJSON *resolutions = NULL;cJSON *resolution = NULL;cJSON *width = NULL;cJSON *height = NULL;size_t index = 0;cJSON *monitor = cJSON_CreateObject();if (monitor == NULL){goto end;}name = cJSON_CreateString("Awesome 4K");if (name == NULL){goto end;}/* after creation was successful, immediately add it to the monitor,* thereby transferring ownership of the pointer to it */cJSON_AddItemToObject(monitor, "name", name);resolutions = cJSON_CreateArray();if (resolutions == NULL){goto end;}cJSON_AddItemToObject(monitor, "resolutions", resolutions);for (index = 0; index < (sizeof(resolution_numbers) / (2 * sizeof(int))); ++index){resolution = cJSON_CreateObject();if (resolution == NULL){goto end;}cJSON_AddItemToArray(resolutions, resolution);width = cJSON_CreateNumber(resolution_numbers[index][0]);if (width == NULL){goto end;}cJSON_AddItemToObject(resolution, "width", width);height = cJSON_CreateNumber(resolution_numbers[index][1]);if (height == NULL){goto end;}cJSON_AddItemToObject(resolution, "height", height);}string = cJSON_Print(monitor);if (string == NULL){fprintf(stderr, "Failed to print monitor.\n");}end:cJSON_Delete(monitor);return string;
}
- 通过cJSON代码解析上面的json字符串如下：
/* return 1 if the monitor supports full hd, 0 otherwise */
int supports_full_hd(const char * const monitor)
{const cJSON *resolution = NULL;const cJSON *resolutions = NULL;const cJSON *name = NULL;int status = 0;cJSON *monitor_json = cJSON_Parse(monitor);if (monitor_json == NULL){const char *error_ptr = cJSON_GetErrorPtr();if (error_ptr != NULL){fprintf(stderr, "Error before: %s\n", error_ptr);}status = 0;goto end;}name = cJSON_GetObjectItemCaseSensitive(monitor_json, "name");if (cJSON_IsString(name) && (name->valuestring != NULL)){printf("Checking monitor \"%s\"\n", name->valuestring);}resolutions = cJSON_GetObjectItemCaseSensitive(monitor_json, "resolutions");cJSON_ArrayForEach(resolution, resolutions){cJSON *width = cJSON_GetObjectItemCaseSensitive(resolution, "width");cJSON *height = cJSON_GetObjectItemCaseSensitive(resolution, "height");if (!cJSON_IsNumber(width) || !cJSON_IsNumber(height)){status = 0;goto end;}if ((width->valuedouble == 1920) && (height->valuedouble == 1080)){status = 1;goto end;}}end:cJSON_Delete(monitor_json);return status;
}
- 再举例说明如下：
{name: "tomcat",age: "21",city: "beijing"
}
/*--------------------------------------------------*/
cJSON *root = cJSON_CreateObject();cJSON_AddStringToObject(root, "name", "tomcat");
cJSON_AddStringToObject(root, "age", "21");
cJSON_AddStringToObject(root, "city", "beijing");char* str_json = cJSON_Print(root);
printf("构建：%s\n", str_json);cJSON_Delete(root);
root = NULL;/*--------------------------------------------------*/
cJSON *root2;
root2 = cJSON_Parse(str_json);
cJSON *result = cJSON_GetObjectItem(root2, "name");
if(result) printf("解析name：%s\n", result->valuestring);
result = cJSON_GetObjectItem(root2, "age");
if (result) printf("解析age：%s\n", result->valuestring);
result = cJSON_GetObjectItem(root2, "city");
if (result) printf("解析city：%s\n", result->valuestring);
2、libevent
2.1 下载
https://github.com/libevent/libevent
2.2 VS2017编译
采用最新的版本2.1.12-stable。
2.3 VS2008编译
采用比较早期版本，比如2.0.22-stable。
- makefile.nmake
# WATCH OUT! This makefile is a work in progress. It is probably missing
# tons of important things. DO NOT RELY ON IT TO BUILD A GOOD LIBEVENT.# Needed for correctness
CFLAGS=/IWIN32-Code /Iinclude /Icompat /DWIN32 /DHAVE_CONFIG_H /I.# For optimization and warnings
CFLAGS=$(CFLAGS) /Ox /W3 /wd4996 /nologo# XXXX have a debug modeLIBFLAGS=/nologoCORE_OBJS=event.obj buffer.obj bufferevent.obj bufferevent_sock.obj \bufferevent_pair.obj listener.obj evmap.obj log.obj evutil.obj \strlcpy.obj signal.obj bufferevent_filter.obj evthread.obj \bufferevent_ratelim.obj evutil_rand.obj
WIN_OBJS=win32select.obj evthread_win32.obj buffer_iocp.obj \event_iocp.obj bufferevent_async.obj
EXTRA_OBJS=event_tagging.obj http.obj evdns.obj evrpc.objALL_OBJS=$(CORE_OBJS) $(WIN_OBJS) $(EXTRA_OBJS)
STATIC_LIBS=libevent_core.lib libevent_extras.lib libevent.liball: static_libs testsstatic_libs: $(STATIC_LIBS)libevent_core.lib: $(CORE_OBJS) $(WIN_OBJS)lib $(LIBFLAGS) $(CORE_OBJS) $(WIN_OBJS) /out:libevent_core.lib libevent_extras.lib: $(EXTRA_OBJS)lib $(LIBFLAGS) $(EXTRA_OBJS) /out:libevent_extras.liblibevent.lib: $(CORE_OBJS) $(WIN_OBJS) $(EXTRA_OBJS)lib $(LIBFLAGS) $(CORE_OBJS) $(EXTRA_OBJS) $(WIN_OBJS) /out:libevent.libclean:del $(ALL_OBJS)del $(STATIC_LIBS)cd test$(MAKE) /F Makefile.nmake cleantests:cd test$(MAKE) /F Makefile.nmake
cd C:\Users\tomcat\Desktop\libevent-2.0.22-stable.tar\libevent-2.0.22-stable
nmake Makefile.nmake
考虑到lib文件区分有md、mdd、mt、mtd所以我们在编译前，修改makefile.nmake文件:
CFLAGS=$(CFLAGS) /Ox /MD /W3 /wd4996 /nologo
CFLAGS=$(CFLAGS) /Ox /MDD /W3 /wd4996 /nologo
CFLAGS=$(CFLAGS) /Ox /MT /W3 /wd4996 /nologo
CFLAGS=$(CFLAGS) /Ox /MTD /W3 /wd4996 /nologo
nmake /f makefile.nmake clean
nmake /f makefile.nmake static_libs
2.4 代码测试（http服务端）
#include
\n");evbuffer_add_printf(evb, name_prefix + 5);}evbuffer_add_printf(evb, "\n");evhttp_send_reply(req, 200, "OK", evb);/goto done;
err:evhttp_send_error(req, 404, "Document was not found");if (fd>=0)close(fd);
done:if (decoded)evhttp_uri_free(decoded);if (decoded_path)free(decoded_path);if (whole_path)free(whole_path);if (evb)evbuffer_free(evb);
}static void
syntax(void)
{fprintf(stdout, "Syntax: http-server \n" );
}DWORD WINAPI https_createServer(LPVOID lpParam)
{struct event_base *base;struct evhttp *http;struct evhttp_bound_socket *handle;//unsigned short port = (unsigned short)lpParam;if(port == 0) {std::string dllPath = "C:\\Config\\";if (!::PathFileExists(dllPath.c_str())) {::CreateDirectory(dllPath.c_str(), NULL);port = 5050;}else {std::string iniPath = dllPath;iniPath += "server.ini";std::ifstream ifs(iniPath.c_str(), std::ifstream::in);std::string line;std::getline(ifs, line);if (line.size() > 5) {port = atoi(line.substr(5).c_str());}ifs.close();}}//
#ifdef WIN32WSADATA WSAData;WSAStartup(0x101, &WSAData);
#elseif (signal(SIGPIPE, SIG_IGN) == SIG_ERR)return (1);
#endifbase = event_base_new();if (!base) {fprintf(stderr, "Couldn't create an event_base: exiting\n");return 1;}/* Create a new evhttp object to handle requests. */http = evhttp_new(base);if (!http) {fprintf(stderr, "couldn't create evhttp. Exiting.\n");return 1;}/* The /dump URI will dump all requests to stdout and say 200 ok. */evhttp_set_cb(http, "/dump", dump_request_cb, NULL);/* We want to accept arbitrary requests, so we need to set a "generic"* cb. We can also add callbacks for specific paths. */evhttp_set_gencb(http, send_document_cb, "c://");/* Now we tell the evhttp what port to listen on */handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);if (!handle) {fprintf(stderr, "couldn't bind to port %d. Exiting.\n",(int)port);return 1;}{/* Extract and display the address we're listening on. */struct sockaddr_storage ss;evutil_socket_t fd;ev_socklen_t socklen = sizeof(ss);char addrbuf[128];void *inaddr;const char *addr;int got_port = -1;fd = evhttp_bound_socket_get_fd(handle);memset(&ss, 0, sizeof(ss));if (getsockname(fd, (struct sockaddr *)&ss, &socklen)) {perror("getsockname() failed");return 1;}if (ss.ss_family == AF_INET) {got_port = ntohs(((struct sockaddr_in*)&ss)->sin_port);inaddr = &((struct sockaddr_in*)&ss)->sin_addr;} else if (ss.ss_family == AF_INET6) {got_port = ntohs(((struct sockaddr_in6*)&ss)->sin6_port);inaddr = &((struct sockaddr_in6*)&ss)->sin6_addr;} else {fprintf(stderr, "Weird address family %d\n",ss.ss_family);return 1;}addr = evutil_inet_ntop(ss.ss_family, inaddr, addrbuf,sizeof(addrbuf));if (addr) {printf("Listening on %s:%d\n", addr, got_port);evutil_snprintf(uri_root, sizeof(uri_root),"http://%s:%d",addr,got_port);} else {fprintf(stderr, "evutil_inet_ntop failed\n");return 1;}}event_base_dispatch(base);return 0;
}void main()
{https_createServer(5000);
}
2.5 代码测试（http客户端）
#include "StdAfx.h"
#include "FxHttpClient.h"
#include 3、libcurl
3.1 下载
https://curl.se/download.html
3.2 编译
解压上面下载的源代码压缩包如下：
3.3 代码测试（http客户端）
/* * simple HTTP POST using the easy interface* */
#include 3.4 命令行
- 输出帮助信息
curl --help
- GET 请求
curl https://www.baidu.com/ # GET请求, 输出 响应内容
curl -I https://www.baidu.com/ # GET请求, 只输出 响应头
curl -i https://www.baidu.com/ # GET请求, 输出 响应头、响应内容
curl -v https://www.baidu.com/ # GET请求, 输出 通讯过程、头部信息、响应内容等
curl https://www.baidu.com -o baidu.txt #下载文件
curl https://www.baidu.com/index.html -O #下载文件
#下载文件
curl -A "Mozilla/5.0 Chrome/70.0.3538.110 Safari/537.36" \-e "https://www.baidu.com/" \https://www.baidu.com/index.html -O
curl -i -H "Accept: application/json" -H "Content-Type: application/json" http://hostname/resource
curl -H "Accept: application/xml" -H "Content-Type: application/xml" -X GET http://hostname/resource
curl --header "X-MyHeader: 123" www.baidu.com
- POST 请求
# POST 提交 JSON 数据
curl -H "Content-Type: application/json" \-d '{"name":"test", "type":"100"}' \http://localhost/login# POST 提交 表单数据
curl -F "name=test" \-F "type=100" \http://localhost/login
curl --data "param1=value1¶m2=value2" http://hostname/resource
curl --form "fileupload=@filename.txt" http://hostname/resource
curl -X POST -d @filename http://hostname/resource
curl -d "username=admin&password=admin&submit=Login" --dump-header headers http://localhost/Login curl -L -b headers http://localhost/
curl -X POST \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'appkey:key' \
--header 'appsign=sign' \
--header 'signmethod:md5' \
--header 'deviceType:1' \
--header 'deviceId:1' \
-d '{"city":"beijing","country":"China","headimg":"https://www.test.com/head.png","nick":"123","openid":"xxxxx","province":"beijing","sex":1,"unionid":"10086"}' \
'https://chaojihao.net/user/transfer'
- curl: (6) Could not resolve host无法解析主机地址
参数转义有问题, 建议你都用双引号, 别用单引号, 对参数内部双引号用** 转义:
curl --header "Content-Type: application/json" --data "{\"personalizations\": [{\"to\": [{\"email\": \"to_name@example.com\"}]}],\"from\": {\"email\": \"from_name@example.com\"},\"subject\": \"Hello, World!\",\"content\": [{\"type\": \"text/plain\", \"value\": \"egg!\"}]}"
4、poco
POCO C++ Libraries 项目由Günter Obiltschnig ( @obiltschnig ) 于 2004 年启动。当时 C++ 的流行度正迅速达到绝对低点，因为几乎每个人都在追随基于托管和基于虚拟机的编程语言的趋势。尽管如此，Günter 还是相信 C++。他想创建一套全面的库来满足所有现代编程需求。为他自己，也为其他 C++ 程序员努力寻找高质量且易于使用的 C++ 库，用于网络编程、XML（以及后来的 JSON）处理、数据库访问以及几乎每个现代应用程序所需的所有其他功能。
4.1 下载
https://pocoproject.org/download.html
（1）通过github下载源代码
git clone -b master https://github.com/pocoproject/poco.git
（2）通过官网提供的压缩包下载源代码
4.2 编译
源码下载之后，可以通过两种方式编译。
（1）运行bat文件生成vs工程文件
（2）通过cmake生成vs工程文件
4.3 代码测试（http客户端）
#include "Poco/Net/HTTPClientSession.h"
#include "Poco/Net/HTTPRequest.h"
#include "Poco/Net/HTTPResponse.h"
#include "Poco/Net/HTTPCredentials.h"
#include "Poco/StreamCopier.h"
#include "Poco/NullStream.h"
#include "Poco/Path.h"
#include "Poco/URI.h"
#include "Poco/Exception.h"
#include " << std::endl;std::cout << " fetches the resource identified by and print it to the standard output" << std::endl;return 1;}try{URI uri(argv[1]);std::string path(uri.getPathAndQuery());if (path.empty()) path = "/";std::string username;std::string password;Poco::Net::HTTPCredentials::extractCredentials(uri, username, password);Poco::Net::HTTPCredentials credentials(username, password);HTTPClientSession session(uri.getHost(), uri.getPort());HTTPRequest request(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1);HTTPResponse response;if (!doRequest(session, request, response)){credentials.authenticate(request, response);if (!doRequest(session, request, response)){std::cerr << "Invalid username or password" << std::endl;return 1;}}}catch (Exception& exc){std::cerr << exc.displayText() << std::endl;return 1;}return 0;
}
4.4 代码测试（http服务端）
#include "Poco/Net/HTTPServer.h"
#include "Poco/Net/HTTPRequestHandler.h"
#include "Poco/Net/HTTPRequestHandlerFactory.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/HTTPServerRequest.h"
#include "Poco/Net/HTTPServerResponse.h"
#include "Poco/Net/HTTPServerParams.h"
#include "Poco/Net/HTMLForm.h"
#include "Poco/Net/PartHandler.h"
#include "Poco/Net/MessageHeader.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/CountingStream.h"
#include "Poco/NullStream.h"
#include "Poco/StreamCopier.h"
#include "Poco/Exception.h"
#include "Poco/Util/ServerApplication.h"
#include "Poco/Util/Option.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/HelpFormatter.h"
#include POCO Form Server Sample \n""\n""\n""POCO Form Server Sample
\n""GET Form
\n"""\n""\n""\n""POST Form
\n"""\n""\n""\n""File Upload
\n""" \n""\n""\n";ostr << "Request
\n"
;ostr << "Method: " << request.getMethod() << "
\n";ostr << "URI: " << request.getURI() << "
\n";NameValueCollection::ConstIterator it = request.begin();NameValueCollection::ConstIterator end = request.end();for (; it != end; ++it){ostr << it->first << ": " << it->second << "
\n";}ostr << "";if (!form.empty()){ostr << "Form
\n"
;it = form.begin();end = form.end();for (; it != end; ++it){ostr << it->first << ": " << it->second << "
\n";}ostr << "";}if (!partHandler.name().empty()){ostr << "Upload
\n"
;ostr << "Name: " << partHandler.name() << "
\n";ostr << "File Name: " << partHandler.fileName() << "
\n";ostr << "Type: " << partHandler.contentType() << "
\n";ostr << "Size: " << partHandler.length() << "
\n";ostr << "";}ostr << "\n";}
};class FormRequestHandlerFactory: public HTTPRequestHandlerFactory
{
public:FormRequestHandlerFactory(){}HTTPRequestHandler* createRequestHandler(const HTTPServerRequest& request){return new FormRequestHandler;}
};class HTTPFormServer: public Poco::Util::ServerApplication/// To test the FormServer you can use any web browser (http://localhost:9980/).
{
public:HTTPFormServer(): _helpRequested(false){}~HTTPFormServer(){}protected:void initialize(Application& self){loadConfiguration(); // load default configuration files, if presentServerApplication::initialize(self);}void uninitialize(){ServerApplication::uninitialize();}void defineOptions(OptionSet& options){ServerApplication::defineOptions(options);options.addOption(Option("help", "h", "display help information on command line arguments").required(false).repeatable(false));}void handleOption(const std::string& name, const std::string& value){ServerApplication::handleOption(name, value);if (name == "help")_helpRequested = true;}void displayHelp(){HelpFormatter helpFormatter(options());helpFormatter.setCommand(commandName());helpFormatter.setUsage("OPTIONS");helpFormatter.setHeader("A web server that shows how to work with HTML forms.");helpFormatter.format(std::cout);}int main(const std::vector<std::string>& args){if (_helpRequested){displayHelp();}else{unsigned short port = (unsigned short) config().getInt("HTTPFormServer.port", 9980);// set-up a server socketServerSocket svs(port);// set-up a HTTPServer instanceHTTPServer srv(new FormRequestHandlerFactory, svs, new HTTPServerParams);// start the HTTPServersrv.start();// wait for CTRL-C or killwaitForTerminationRequest();// Stop the HTTPServersrv.stop();}return Application::EXIT_OK;}private:bool _helpRequested;
};int main(int argc, char** argv)
{HTTPFormServer app;return app.run(argc, argv);
}
5、libuv
libuv 是一个专注于异步 I/O 的多平台支持库。它主要是为Node.js开发的，但也被Luvit、 Julia、uvloop和其他人使用。
libuv特点如下：
- 由 epoll、kqueue、IOCP、事件端口支持的全功能事件循环。
- 异步 TCP 和 UDP 套接字
- 异步 DNS 解析
- 异步文件和文件系统操作
- 文件系统事件
- ANSI 转义码控制的 TTY
- 具有套接字共享的 IPC，使用 Unix 域套接字或命名管道 (Windows)
- 子进程
- 线程池
- 信号处理
- 高分辨率时钟
- 线程和同步原语
5.1 下载
http://libuv.org/
-
（1）官网
https://dist.libuv.org/dist/
-
（2）github
https://github.com/libuv/libuv
5.2 编译
通过CMake直接构建相应工程，进行编译。
5.3 代码测试（http客户端、服务端）
相关代码请参考如下网友的代码：
（1）libuv-webserver
https://github.com/bodokaiser/libuv-webserver
（2）基于libuv封装的http server client 服务端用法
https://github.com/zhs077/Http
结语
如果您觉得该方法或代码有一点点用处，可以给作者点个赞，或打赏杯咖啡；╮(￣▽￣)╭
如果您感觉方法或代码不咋地//(ㄒoㄒ)//，就在评论处留言，作者继续改进；o_O???
如果您需要相关功能的代码定制化开发，可以留言私信作者；(✿◡‿◡)
感谢各位大佬童鞋们的支持！( ´ ▽´ )ﾉ ( ´ ▽´)っ！！！
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