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tdutils/td/utils/port/UdpSocketFd.h

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+/*
+    This file is part of TON Blockchain Library.
+
+    TON Blockchain Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 2 of the License, or
+    (at your option) any later version.
+
+    TON Blockchain Library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2017-2019 Telegram Systems LLP
+*/
+#pragma once
+
+#include "td/utils/port/config.h"
+
+#include "td/utils/buffer.h"
+#include "td/utils/optional.h"
+#include "td/utils/port/detail/NativeFd.h"
+#include "td/utils/port/detail/PollableFd.h"
+#include "td/utils/port/IPAddress.h"
+#include "td/utils/Slice.h"
+#include "td/utils/Span.h"
+#include "td/utils/Status.h"
+
+#include <memory>
+
+namespace td {
+// Udp and errors
+namespace detail {
+class UdpSocketFdImpl;
+class UdpSocketFdImplDeleter {
+ public:
+  void operator()(UdpSocketFdImpl *impl);
+};
+}  // namespace detail
+
+struct UdpMessage {
+  IPAddress address;
+  BufferSlice data;
+  Status error;
+};
+
+class UdpSocketFd {
+ public:
+  UdpSocketFd();
+  UdpSocketFd(UdpSocketFd &&);
+  UdpSocketFd &operator=(UdpSocketFd &&);
+  ~UdpSocketFd();
+
+  UdpSocketFd(const UdpSocketFd &) = delete;
+  UdpSocketFd &operator=(const UdpSocketFd &) = delete;
+
+  Result<uint32> maximize_snd_buffer(uint32 max_buffer_size = 0);
+  Result<uint32> maximize_rcv_buffer(uint32 max_buffer_size = 0);
+
+  static Result<UdpSocketFd> open(const IPAddress &address) TD_WARN_UNUSED_RESULT;
+
+  PollableFdInfo &get_poll_info();
+  const PollableFdInfo &get_poll_info() const;
+  const NativeFd &get_native_fd() const;
+
+  void close();
+  bool empty() const;
+
+  static bool is_critical_read_error(const Status &status);
+
+#if TD_PORT_POSIX
+  struct OutboundMessage {
+    const IPAddress *to;
+    Slice data;
+  };
+  struct InboundMessage {
+    IPAddress *from;
+    MutableSlice data;
+    Status *error;
+  };
+
+  Status send_message(const OutboundMessage &message, bool &is_sent) TD_WARN_UNUSED_RESULT;
+  Status receive_message(InboundMessage &message, bool &is_received) TD_WARN_UNUSED_RESULT;
+
+  Status send_messages(Span<OutboundMessage> messages, size_t &count) TD_WARN_UNUSED_RESULT;
+  Status receive_messages(MutableSpan<InboundMessage> messages, size_t &count) TD_WARN_UNUSED_RESULT;
+#elif TD_PORT_WINDOWS
+  Result<optional<UdpMessage> > receive();
+
+  void send(UdpMessage message);
+
+  Status flush_send();
+#endif
+
+ private:
+  static constexpr uint32 default_udp_max_snd_buffer_size = (1 << 24);
+  static constexpr uint32 default_udp_max_rcv_buffer_size = (1 << 24);
+  std::unique_ptr<detail::UdpSocketFdImpl, detail::UdpSocketFdImplDeleter> impl_;
+  explicit UdpSocketFd(unique_ptr<detail::UdpSocketFdImpl> impl);
+};
+
+}  // namespace td