Initial commit
This commit is contained in:
@@ -0,0 +1,436 @@
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#ifdef __linux__
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#include "Socket_p.h"
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#include <netinet/tcp.h>
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#include <sys/ioctl.h>
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namespace Psc::socket {
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NetError NetErrorCategory::map_system_error(int e) noexcept {
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switch (e) {
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case EINTR:
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return NetError::interrupted;
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case ECANCELED:
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return NetError::operation_canceled;
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case EINVAL:
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return NetError::invalid_argument;
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case EACCES:
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return NetError::permission_denied;
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case ENOMEM:
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return NetError::out_of_memory;
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case EMFILE:
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case ENFILE:
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case ENOBUFS:
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return NetError::resource_exhausted;
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case EIO:
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return NetError::io_error;
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case EBADF:
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return NetError::bad_file_descriptor;
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case ENOTSOCK:
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return NetError::not_a_socket;
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case EAGAIN:
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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case EWOULDBLOCK:
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#endif
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return NetError::would_block;
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case EINPROGRESS:
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return NetError::in_progress;
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case EALREADY:
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return NetError::already_in_progress;
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case EADDRINUSE:
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return NetError::address_in_use;
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case EADDRNOTAVAIL:
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return NetError::address_not_available;
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case ENETDOWN:
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return NetError::network_down;
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case ENETUNREACH:
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return NetError::network_unreachable;
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case EHOSTUNREACH:
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return NetError::host_unreachable;
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case EPROTO:
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case EPROTOTYPE:
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case ENOPROTOOPT:
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return NetError::protocol_error;
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case ENOTCONN:
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return NetError::not_connected;
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case EISCONN:
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return NetError::already_connected;
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case ECONNREFUSED:
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return NetError::connection_refused;
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case ECONNRESET:
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return NetError::connection_reset;
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case ECONNABORTED:
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return NetError::connection_aborted;
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case ETIMEDOUT:
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return NetError::timed_out;
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case EPIPE:
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return NetError::broken_pipe;
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default:
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return NetError::unknown_error;
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}
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}
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namespace TCP {
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Ret<std::optional<Accept_Info>> accept(Socket_FD listen_fd) {
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sockaddr_in clientAddr{};
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socklen_t clientAddrSize = sizeof(clientAddr);
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const int client_fd = ::accept(
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listen_fd, reinterpret_cast<sockaddr *>(&clientAddr), &clientAddrSize);
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if (client_fd < 0) {
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const int e = errno;
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// 非阻塞：当前没有新连接（正常情况）
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// Linux 下通常是 EAGAIN / EWOULDBLOCK；被信号中断是 EINTR
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if (e == EAGAIN
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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|| e == EWOULDBLOCK
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#endif
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|| e == EINTR) {
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return std::nullopt;
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}
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const auto ne = NetErrorCategory::map_system_error(e);
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LOG_FD_Debug(listen_fd, std::string("accept error: ") +
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std::system_category().message(e));
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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Accept_Info info{};
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info.fd = client_fd;
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char ipbuf[INET_ADDRSTRLEN]{};
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if (::inet_ntop(AF_INET, &clientAddr.sin_addr, ipbuf, sizeof(ipbuf)) ==
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nullptr) {
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const int e = errno; // inet_ntop 失败时设置 errno
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const auto ne = NetErrorCategory::map_system_error(e);
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LOG_FD_Debug(listen_fd, std::string("inet_ntop error: ") +
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std::system_category().message(e));
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::close(client_fd); // 纯 Linux 语义：避免泄漏已 accept 的 fd
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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info.sockaddr.ip = ipbuf;
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info.sockaddr.port = ntohs(clientAddr.sin_port);
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return info;
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}
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} // namespace TCP
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Ret<bool> connect(Socket_FD that, const Sockaddr_In &addr_in) {
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sockaddr_in addr{};
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addr.sin_family = AF_INET;
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addr.sin_port = htons(addr_in.port);
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if (::inet_pton(AF_INET, addr_in.ip.c_str(), &addr.sin_addr) <= 0) {
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::invalid_argument));
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}
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if (::connect(that, reinterpret_cast<sockaddr *>(&addr), sizeof(addr)) < 0) {
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const int e = errno;
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// 非阻塞 connect：EINPROGRESS / EALREADY 表示“连接进行中”，不算失败
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if (e == EINPROGRESS || e == EALREADY) {
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// 这里用你的错误体系表达“进行中”（调用方可用 poll/epoll/select
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// 等等待可写）
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::in_progress, e));
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// 如果你更希望用返回值表达进行中，也可以改成：return false;
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}
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const auto ne = NetErrorCategory::map_system_error(e);
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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return true;
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}
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// 纯 Linux 语义：recv_all
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// - recv 返回 -1 表示失败，错误在 errno
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// - 非阻塞无数据/被信号打断：返回已收到部分（可能为空）
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// - recv 返回 0：对端正常关闭(EOF)，这里返回 NetError::connection_closed
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#include <string>
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#include <cerrno>
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#include <system_error>
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#ifdef _WIN32
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// 你这里是 Linux 版，用 errno / ioctl；Windows 需要 ioctlsocket + WSAGetLastError
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#else
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#endif
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Ret<std::string> recv_all(Socket_FD fd) {
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// 1) 先拿内核缓冲区里当前可读的字节数
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#ifdef _WIN32
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::not_supported)); // 如需我给 Windows 版我再补
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#else
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int avail = 0;
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if (::ioctl(fd, FIONREAD, &avail) != 0) {
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const int e = errno;
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const auto ne = NetErrorCategory::map_system_error(e);
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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if (avail <= 0) {
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// avail==0：要区分“对端关闭” vs “当前没数据(EAGAIN)”
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// 用 MSG_PEEK 看看是否已经 EOF 或者只是没数据。
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char ch;
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for (;;) {
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const ssize_t n = ::recv(fd, &ch, 1, MSG_PEEK);
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if (n > 0) {
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// 有数据但 ioctl 说 0：极少见（竞态），再走一次 ioctl 或直接读 1
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avail = 1;
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break;
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}
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if (n == 0) {
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::connection_closed));
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}
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// n < 0
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const int e = errno;
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if (e == EINTR) continue;
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if (e == EAGAIN
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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|| e == EWOULDBLOCK
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#endif
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) {
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return std::string{}; // 非阻塞：当前没数据，正常返回空串（或你也可以返回 unexpected<Enum_Err<NetError>>）
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}
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const auto ne = NetErrorCategory::map_system_error(e);
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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}
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// 2) 一次性读 avail 字节
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std::string out;
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out.resize(static_cast<size_t>(avail));
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size_t off = 0;
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while (off < static_cast<size_t>(avail)) {
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const ssize_t n = ::recv(fd, out.data() + off,
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static_cast<size_t>(avail) - off, 0);
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if (n > 0) {
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off += static_cast<size_t>(n);
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continue;
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}
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if (n == 0) {
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// 读到一半对端关闭：保留已读部分还是报错，看你语义
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out.resize(off);
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::connection_closed));
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}
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const int e = errno;
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if (e == EINTR) continue;
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// 这里一般不该出现 EAGAIN（因为我们按 avail 读），但竞态下可能发生
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if (e == EAGAIN
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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|| e == EWOULDBLOCK
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#endif
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) {
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out.resize(off);
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return out; // 返回已读部分
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}
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out.resize(off);
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const auto ne = NetErrorCategory::map_system_error(e);
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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// 正常：一次性读完
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return out;
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#endif
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}
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namespace UDP {
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Ret<std::string> recvfrom(Socket_FD receive_fd, Sockaddr_In *ret,
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int chunk_size) {
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if (chunk_size <= 0 || ret == nullptr) {
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::invalid_argument));
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}
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std::string buffer;
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buffer.resize(static_cast<size_t>(chunk_size));
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sockaddr_in client_addr{};
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socklen_t addr_len = sizeof(client_addr);
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const ssize_t n =
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::recvfrom(receive_fd, buffer.data(), static_cast<size_t>(chunk_size), 0,
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reinterpret_cast<sockaddr *>(&client_addr), &addr_len);
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if (n < 0) {
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const int e = errno;
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if (e == EAGAIN
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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|| e == EWOULDBLOCK
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#endif
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|| e == EINTR) {
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return std::string{};
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}
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const auto ne = NetErrorCategory::map_system_error(e);
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LOG_FD_Debug(receive_fd, std::string("recvfrom error: ") +
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std::system_category().message(e));
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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// n == 0：UDP 允许 0 长度 datagram，仍然要填来源地址
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char client_ip[INET_ADDRSTRLEN]{};
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if (::inet_ntop(AF_INET, &client_addr.sin_addr, client_ip,
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sizeof(client_ip)) == nullptr) {
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const int e = errno; // inet_ntop 失败会设置 errno
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const auto ne = NetErrorCategory::map_system_error(e);
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LOG_FD_Debug(receive_fd, std::string("inet_ntop error: ") +
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std::system_category().message(e));
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return unexpected<Enum_Err<NetError>>(Enum_Err(ne, e));
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}
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ret->ip = client_ip;
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ret->port = ntohs(client_addr.sin_port);
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buffer.resize(static_cast<size_t>(n));
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return buffer;
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}
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} // namespace UDP
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ERROR_CODE_TYPE last_socket_ec() { return errno; }
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using Socket_FD = int;
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constexpr int kSocketError = -1;
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Ret<void> set_block(Socket_FD fd, bool blocking) {
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if (fd == -1)
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return Ret<void>();
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int flags = fcntl(fd, F_GETFL, 0);
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if (flags == -1) {
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std::cerr << "Failed to get socket flags." << std::endl;
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}
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if (blocking) {
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flags &= ~O_NONBLOCK; // 清除 O_NONBLOCK 标志，设置为阻塞
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} else {
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flags |= O_NONBLOCK; // 设置 O_NONBLOCK 标志，设置为非阻塞
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}
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if (fcntl(fd, F_SETFL, flags) == -1) {
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LOG_FD_ERROR(fd, "Failed to set socket to " +
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std::string(blocking ? "blocking" : "non-blocking") +
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" mode.")
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return unexpected<Enum_Err<NetError>>(Enum_Err(NetError::unknown_error));
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}
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return Ret<void>();
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}
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bool is_needed_reconnect_ec(ERROR_CODE_TYPE e) {
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switch (e) {
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// 连接已失效/网络不可达：建议重连
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case ECONNRESET:
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case ECONNABORTED:
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case ENOTCONN:
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case ETIMEDOUT:
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case ENETDOWN:
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case ENETUNREACH:
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case EHOSTUNREACH:
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case ECONNREFUSED: // 多见于 connect；这里出现也可视为需重连
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case EPIPE: // 也可视为连接不可用（更常见于 send，但有时可一起处理）
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return true;
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// 现在没数据/可重试/被打断：不重连
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case EAGAIN:
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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case EWOULDBLOCK:
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#endif
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case EINTR:
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case EINPROGRESS:
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case EALREADY:
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return false;
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// 其他错误：保守处理为不重连（也可改成 true 更激进）
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default:
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return false;
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}
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}
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bool is_needed_reconnect(int fd) {
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char buf[1];
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const ssize_t r = ::recv(fd, buf, sizeof(buf), MSG_PEEK);
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return is_needed_reconnect_ec(r);
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}
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// 根据“系统错误码/返回码”判断：这个 TCP 连接是否应该被认为已失效并关闭。
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// 约定：
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// - r == 0 ：通常表示对端正常关闭（EOF/FIN），应关闭本端连接。
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// - r < 0 ：表示发生错误；具体原因需要结合 errno（Linux）分类。
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// - r > 0 ：表示仍可读到数据/连接仍活着，不关闭。
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bool is_client_need_close_ec(ERROR_CODE_TYPE e) {
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switch (e) {
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// ====== 致命错误：连接已不可用，建议关闭 ======
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case ECONNRESET:
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// 连接被对端复位（RST），对端异常断开：应关闭
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return true;
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case ECONNABORTED:
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// 连接被中止（本端/对端导致），不可继续使用：应关闭
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return true;
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case ENOTCONN:
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// socket 未处于连接状态（例如已经断开或从未连接）：应关闭
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return true;
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case ETIMEDOUT:
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// 连接超时（可能是网络断开/对端无响应）：通常视为失效，建议关闭
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return true;
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case EPIPE:
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// 管道破裂：常见于 send 时对端已关闭；连接不可用：应关闭
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return true;
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case ECONNREFUSED:
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// 连接被拒绝：通常发生在 connect 阶段；若出现在此处也视为不可用：应关闭
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return true;
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// ====== 暂态/可恢复错误：不建议立即关闭 ======
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case EAGAIN:
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// 非阻塞模式下“暂时无数据/暂不可读写”，属于正常现象：不关闭
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#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
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case EWOULDBLOCK:
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// 与 EAGAIN 类似，表示暂时会阻塞：不关闭
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#endif
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return false;
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case EINPROGRESS:
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// 非阻塞 connect 进行中：不关闭
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return false;
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case EALREADY:
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// 非阻塞 connect 已在进行：不关闭
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return false;
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case EINTR:
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// 系统调用被信号中断：通常应重试，而不是关闭
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return false;
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default:
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// 其他错误：保守策略——不立刻关闭（也可按需求改为 true 更激进）
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return false;
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}
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}
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bool is_client_need_close(int fd) {
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char buf[1];
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int r = ::recv(fd, buf, sizeof(buf), MSG_PEEK);
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return is_client_need_close_ec(r);
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}
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} // namespace Psc::socket
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#endif
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Reference in New Issue
Block a user