feat: 增加最小网络非阻塞 TCP 测试用例，初步定义 HTTP 协议体

.gitignore

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+.vscode
+build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.15)
+
+project(ouc_server VERSION 0.0.1 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static -g -O2")
+
+include_directories(${PROJECT_SOURCE_DIR}/include)
+
+add_executable(test "${PROJECT_SOURCE_DIR}/example/epoll_tcp_loop.cpp")

example/epoll_tcp_loop.cpp

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+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <cstring>
+#include <iostream>
+
+/* set nonblock socket */
+int set_nonblock(int fd)
+{
+    int flags = fcntl(fd, F_GETFL /* Get file discriptor state */, 0);
+    return fcntl(fd, F_SETFL /* Set new file discriptor */, flags | O_NONBLOCK);
+}
+
+int main()
+{
+    int sock_fd = socket(
+        AF_INET,     /* IPv4 */
+        SOCK_STREAM, /* TCP */
+        0 /* File Descriptor */);
+    if (sock_fd < 0)
+    {
+        perror("socket create error");
+        return 1;
+    }
+
+    int opt = 1;
+    setsockopt(
+        sock_fd,
+        SOL_SOCKET,
+        SO_REUSEADDR, /* Allow to bind port muiltiple times */
+        &opt,
+        sizeof(opt));
+
+    sockaddr_in addr{};                /* Internet socket address */
+    addr.sin_family = AF_INET;         /* IPv4 */
+    addr.sin_port = htons(8080);       /* Port */
+    addr.sin_addr.s_addr = INADDR_ANY; /* listen all */
+
+    if (bind(sock_fd, (sockaddr *)&addr, sizeof(addr))) /* Bind file descriptor with socket address. */
+    {
+        perror("bind address error");
+        return 1;
+    }
+    if (listen(sock_fd, SOMAXCONN /* Max wait queue that system allows. */)) /* Listen the file descriptor */
+    {
+        perror("set listen queue error");
+        return 1;
+    }
+    set_nonblock(sock_fd);
+
+    puts("Server listening on port 8080...");
+
+    int epoll_fd = epoll_create1(0); /* create epoll instance */
+    epoll_event ev{};                /* create epoll event instance*/
+    ev.events = EPOLLIN;             /**/
+    ev.data.fd = sock_fd;
+    epoll_ctl(
+        epoll_fd,
+        EPOLL_CTL_ADD, /* Add a file descriptor into epoll to be listened. */
+        sock_fd,
+        &ev);
+
+    const int MAX_EVENTS = 64;
+    epoll_event events[MAX_EVENTS];
+
+    while (true)
+    {
+        int n = epoll_wait(epoll_fd, events, MAX_EVENTS, -1);
+        for (int i = 0; i < n; ++i)
+        {
+            int fd = events[i].data.fd;
+            if (fd == sock_fd)
+            {
+                while (true)
+                {
+                    int client_fd = accept(sock_fd, nullptr, nullptr);
+                    if (client_fd < 0)
+                        break;
+                    printf("New client connected: %d\n", client_fd);
+                    set_nonblock(client_fd);
+
+                    epoll_event cli_ev{};
+                    cli_ev.events = EPOLLIN; /* Wait for new epoll connection */
+                    cli_ev.data.fd = client_fd;
+                    epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client_fd, &cli_ev);
+                }
+            }
+            else
+            {
+                char buf[1024];
+                memset(buf, 0, sizeof(buf));
+                ssize_t r = read(fd, buf, sizeof(buf));
+                write(fd, buf, r); /* Echo data into buffer */
+
+                if (r <= 0 || (!memcmp("exit", buf, 4)))
+                {
+                    epoll_ctl(
+                        epoll_fd,
+                        EPOLL_CTL_DEL, /* Delete file descriptor in epoll */
+                        fd,
+                        nullptr);
+                    close(fd);
+                    continue;
+                }
+
+                printf(buf);
+            }
+        }
+    }
+
+    close(epoll_fd);
+    close(sock_fd);
+    return 0;
+}

example/simpliest_tcp_loop.cpp

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+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>
+#include <cstring>
+#include <iostream>
+
+int main()
+{
+    int sock_fd = socket(
+        AF_INET,     /* IPv4 */
+        SOCK_STREAM, /* TCP */
+        0 /* File Descriptor */);
+    if (sock_fd < 0)
+    {
+        perror("socket create error");
+        return 1;
+    }
+
+    int opt = 1;
+    setsockopt(sock_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
+
+    sockaddr_in addr{};                /* Internet socket address */
+    addr.sin_family = AF_INET;         /* IPv4 */
+    addr.sin_port = htons(8080);       /* Port */
+    addr.sin_addr.s_addr = INADDR_ANY; /* listen all */
+
+    if (bind(sock_fd, (sockaddr *)&addr, sizeof(addr))) /* Bind file descriptor with socket address. */
+    {
+        perror("bind address error");
+        return 1;
+    }
+    if (listen(sock_fd, SOMAXCONN /* Max wait queue that system allows. */)) /* Listen the file descriptor */
+    {
+        perror("set listen queue error");
+        return 1;
+    }
+
+    puts("Server listening on port 8080...");
+
+    int client_fd = 0;
+    while (true)
+    {
+        if (client_fd < 0)
+        {
+            perror("accept socket error");
+            continue;
+        }
+        else if (client_fd == 0)
+        {
+            client_fd = accept(sock_fd, nullptr, nullptr); /* Accept from client */
+            if (client_fd > 0)
+                printf("New client connected: %d\n", client_fd);
+            continue;
+        }
+
+        char buf[1024];
+        memset(buf, 0, sizeof(buf));
+        ssize_t n = read(client_fd, buf, sizeof(buf)); /* Get data length */
+        if (n > 0)
+        {
+            if (!memcmp("exit", buf, 4))
+                break;
+            write(client_fd, buf, n); /* Echo data into buffer */
+            printf(buf);
+        }
+    }
+
+    close(client_fd);
+    close(sock_fd);
+    return 0;
+}

example/test_executable.cpp

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+#include <iostream>
+int main()
+{
+    puts("Hello world!");
+    return 0;
+}

include/ouc_server/http/http_request.hpp

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+#ifndef INCLUDE_OUC_SERVER_HTTP_REQUEST
+#define INCLUDE_OUC_SERVER_HTTP_REQUEST
+
+#include <string>
+
+namespace ouc_server
+{
+    namespace http
+    {
+        enum class HttpMethodType
+        {
+            Get,
+            Head,
+            Post,
+            Put,
+            Delete,
+            Connect,
+            Options,
+            Trace
+        };
+
+        struct HttpRequest
+        {
+            HttpMethodType method;
+        };
+    }
+}
+
+#endif