An initial curvecp implementation. This code is not complete, but does

have a basic unittest.  Crypto code is not yet implemented.

Landing so that we can collaborate on this more.

BUG=none
TEST=curvecp_unittests
Review URL: http://codereview.chromium.org/7039014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@85667 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 104 insertions, 0 deletions

diff --git a/net/curvecp/messenger.h b/net/curvecp/messenger.h
new file mode 100644
index 0000000..7bd1bb8
--- /dev/null
+++ b/net/curvecp/messenger.h
@@ -0,0 +1,104 @@
+// Copyright (c) 2011 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 NET_CURVECP_MESSENGER_H_
+#define NET_CURVECP_MESSENGER_H_
+#pragma once
+
+#include <deque>
+#include <list>
+
+#include "base/basictypes.h"
+#include "base/task.h"
+#include "base/threading/non_thread_safe.h"
+#include "base/timer.h"
+#include "net/base/completion_callback.h"
+#include "net/curvecp/circular_buffer.h"
+#include "net/curvecp/packetizer.h"
+#include "net/curvecp/received_block_list.h"
+#include "net/curvecp/rtt_and_send_rate_calculator.h"
+#include "net/curvecp/sent_block_list.h"
+#include "net/socket/socket.h"
+
+namespace net {
+
+class DrainableIOBuffer;
+class IOBufferWithSize;
+class Packetizer;
+
+// The messenger provides the reliable CurveCP transport.
+class Messenger : public base::NonThreadSafe,
+                  public Packetizer::Listener {
+ public:
+  explicit Messenger(Packetizer* packetizer);
+  virtual ~Messenger();
+
+  int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);
+  int Write(IOBuffer* buf, int buf_len, CompletionCallback* callback);
+
+  // Packetizer::Listener methods:
+  virtual void OnConnection(ConnectionKey key);
+  virtual void OnClose(Packetizer* packetizer, ConnectionKey key);
+  virtual void OnMessage(Packetizer* packetizer,
+                         ConnectionKey key,
+                         unsigned char* msg,
+                         size_t length);
+
+ protected:
+  ConnectionKey key_;
+
+ private:
+  // Handle reading data from the read queue.
+  int InternalRead(IOBuffer* buffer, int buffer_length);
+
+  // Extracts data from send queue to create a new buffer of data to send.
+  IOBufferWithSize* CreateBufferFromSendQueue();
+
+  // Continuation function after a SendMessage() call was blocked.
+  void OnSendMessageComplete(int result);
+
+  // Protocol handling routines
+  void OnTimeout();
+  void OnSendTimer();
+  void SendMessage(int64 position);
+  void RecvMessage();
+  void SendAck(uint32 last_message_received);
+
+  RttAndSendRateCalculator rtt_;
+  Packetizer* packetizer_;
+
+  // The send_buffer is a list of pending data to pack into messages and send
+  // to the remote.
+  CircularBuffer send_buffer_;
+  CompletionCallback* send_complete_callback_;
+  scoped_refptr<IOBuffer> pending_send_;
+  int pending_send_length_;
+
+  // The read_buffer is a list of pending data which has been unpacked from
+  // messages and is awaiting delivery to the application.
+  CompletionCallback* receive_complete_callback_;
+  scoped_refptr<IOBuffer> pending_receive_;
+  int pending_receive_length_;
+
+  // The list of received but unprocessed messages.
+  std::list<scoped_refptr<IOBufferWithSize> > read_queue_;
+
+  ReceivedBlockList received_list_;
+  SentBlockList sent_list_;
+  bool send_message_in_progress_;
+
+  // A timer to fire when a timeout has occurred.
+  base::OneShotTimer<Messenger> send_timeout_timer_;
+  // A timer to fire when we can send data.
+  base::OneShotTimer<Messenger> send_timer_;
+
+  CompletionCallbackImpl<Messenger> send_message_callback_;
+
+  ScopedRunnableMethodFactory<Messenger> factory_;
+  DISALLOW_COPY_AND_ASSIGN(Messenger);
+};
+
+}  // namespace net
+
+#endif  // NET_CURVECP_MESSENGER_H_