Mojo UDP API implementation.

mojo/services/network/udp_socket_impl.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef MOJO_SERVICES_NETWORK_UDP_SOCKET_IMPL_H_
+#define MOJO_SERVICES_NETWORK_UDP_SOCKET_IMPL_H_
+
+#include <queue>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/public/cpp/bindings/interface_impl.h"
+#include "mojo/services/public/interfaces/network/udp_socket.mojom.h"
+#include "net/base/ip_endpoint.h"
+#include "net/udp/udp_server_socket.h"
+
+namespace net {
+class IOBuffer;
+class IOBufferWithSize;
+}
+
+namespace mojo {
+
+class UDPSocketImpl : public InterfaceImpl<UDPSocket> {
+ public:
+  UDPSocketImpl();
+  virtual ~UDPSocketImpl();
+
+  virtual void SetSendBufferSize(
+      uint32_t size,
+      const Callback<void(NetworkErrorPtr)>& callback) OVERRIDE;
+
+  virtual void SetReceiveBufferSize(
+      uint32_t size,
+      const Callback<void(NetworkErrorPtr)>& callback) OVERRIDE;
+
+  virtual void AllowAddressReuse(
+      const Callback<void(NetworkErrorPtr)>& callback) OVERRIDE;
+
+  virtual void Bind(
+      NetAddressPtr addr,
+      const Callback<void(NetworkErrorPtr, NetAddressPtr)>& callback) OVERRIDE;
+
+  virtual void ReceiveMorePackets(uint32_t number) OVERRIDE;
+
+  virtual void SendToAndForget(NetAddressPtr addr,
+                               Array<uint8_t> data) OVERRIDE;
+
+  virtual void SendTo(NetAddressPtr addr,
+                      Array<uint8_t> data,
+                      const Callback<void(NetworkErrorPtr)>& callback) OVERRIDE;
+
+ private:
+  struct PendingSendRequest {
+    PendingSendRequest();
+    ~PendingSendRequest();
+
+    NetAddressPtr addr;
+    Array<uint8_t> data;
+    Callback<void(NetworkErrorPtr)> callback;
+  };
+
+  void DoRecvFrom();
+  void DoSendTo(NetAddressPtr addr,
+                Array<uint8_t> data,
+                const Callback<void(NetworkErrorPtr)>& callback);
+
+  void OnRecvFromCompleted(int net_result);
+  void OnSendToCompleted(const Callback<void(NetworkErrorPtr)>& callback,
+                         int net_result);
+
+  net::UDPServerSocket socket_;
+
+  bool bound_;
+
+  scoped_refptr<net::IOBuffer> recvfrom_buffer_;
+  scoped_refptr<net::IOBufferWithSize> sendto_buffer_;

[brettw, 2014/09/29 18:24:26]

This seems to be used in a nontrivial way and has some interesting invariants.
These should be documented here.

[yzshen1, 2014/09/29 21:51:12]

Done.

+
+  net::IPEndPoint recvfrom_address_;
+
+  size_t remaining_recv_slots_;

[brettw, 2014/09/29 18:24:26]

This one isn't self-explanatory to me.

[yzshen1, 2014/09/29 21:51:12]

Done.

+
+  std::queue<PendingSendRequest*> pending_send_requests_;

[brettw, 2014/09/29 18:24:26]

Can you clarify these are owning pointers?

[yzshen1, 2014/09/29 21:51:12]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(UDPSocketImpl);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_NETWORK_UDP_SOCKET_IMPL_H_