Question

这是我基于libevent的小型http服务器；

#include "fmt/format.h"
#include <cstdint>
#include <cstdio>
#include <event2/event-config.h>
#include <event2/util.h>
#include <evhttp.h>
#include <memory>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <syslog.h>
#include <type_traits>
#include <unistd.h>
auto
main() -> int
{
    constexpr char host[] = "127.0.0.1";
    constexpr std::uint16_t port = 5555;

    using event_base_new_type
        = std::pointer_traits<decltype(event_base_new())>::element_type;
    using event_base_deleter_type = decltype(&event_base_free);
    auto event_base
        = std::unique_ptr<event_base_new_type, event_base_deleter_type>(
            event_base_new(), &event_base_free);

    if(!(event_base))
    {
        fmt::print(stderr, "Failed to init libevent.\n");
        return -1;
    }

    using evhttp_new_type = std::pointer_traits<decltype(
        evhttp_new(event_base.get()))>::element_type;
    using evhttp_deleter_type = decltype(&evhttp_free);
    auto http = std::unique_ptr<evhttp_new_type, evhttp_deleter_type>(
        evhttp_new(event_base.get()), &evhttp_free);

    auto handle = evhttp_bind_socket_with_handle(http.get(), host, port);
    if(!handle)
    {
        fmt::print(stderr, "Failed to init http server.\n");
        return -1;
    }
    auto callback = [](evhttp_request* req, void*) {
        auto* OutBuf = evhttp_request_get_output_buffer(req);
        if(!OutBuf)
            return;
        evbuffer_add_printf(OutBuf,
            "<html><body><center><h1>Hello World!</h1></center></body></html>");
        evhttp_send_reply(req, HTTP_OK, "", OutBuf);
    };
    evhttp_set_gencb(http.get(), callback, nullptr);

    if(event_base_dispatch(event_base.get()) == -1)
    {
        fmt::print(stderr, "Failed to run messahe loop.\n");
        return -1;
    }


    return 0;
}

编译：{{1}}
运行：g++ a.cpp -lfmt -levent
浏览器：./a.out

我正在尝试将该程序作为守护程序运行，因此我可以将其整数化为ctest测试用例。

我已经尝试过this article，这是我的代码：

http://127.0.0.1:5555

但是无法显示“ hello world”。如何解决或有更好的解决方案？

如何将简单的http服务器作为守护程序/服务运行？

0 个答案: