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// 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 REMOTING_HOST_GNUBBY_SOCKET_H_
#define REMOTING_HOST_GNUBBY_SOCKET_H_
#include <string>
#include <vector>
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
namespace base {
class Timer;
} // namespace base
namespace net {
class DrainableIOBuffer;
class IOBufferWithSize;
class StreamSocket;
} // namespace net
namespace remoting {
// Class that manages reading requests and sending responses. The socket can
// only handle receiving one request at a time. It expects to receive no extra
// bytes over the wire, which is checked by IsRequestTooLarge method.
class GnubbySocket : public base::NonThreadSafe {
public:
GnubbySocket(scoped_ptr<net::StreamSocket> socket,
const base::TimeDelta& timeout,
const base::Closure& timeout_callback);
~GnubbySocket();
// Returns false if the request has not yet completed, or is too large to be
// processed. Otherwise, the cached request data is copied into |data_out| and
// the internal buffer resets and is ready for the next request.
bool GetAndClearRequestData(std::string* data_out);
// Sends response data to the socket.
void SendResponse(const std::string& data);
// Sends an SSH error code to the socket.
void SendSshError();
// |request_received_callback| is used to notify the caller that request data
// has been fully read, and caller is to use GetAndClearRequestData method to
// get the request data.
void StartReadingRequest(const base::Closure& request_received_callback);
private:
// Called when bytes are written to |socket_|.
void OnDataWritten(int result);
// Continues writing to |socket_| if needed.
void DoWrite();
// Called when bytes are read from |socket_|.
void OnDataRead(int bytes_read);
// Continues to read.
void DoRead();
// Returns true if the current request is complete.
bool IsRequestComplete() const;
// Returns true if the stated request size is larger than the allowed maximum.
bool IsRequestTooLarge() const;
// Returns the stated request length.
size_t GetRequestLength() const;
// Returns the response length bytes.
std::string GetResponseLengthAsBytes(const std::string& response) const;
// Resets the socket activity timer.
void ResetTimer();
// The socket.
scoped_ptr<net::StreamSocket> socket_;
// Invoked when request data has been read.
base::Closure request_received_callback_;
// Indicates whether read has completed and |request_received_callback_| is
// about to be run.
bool read_completed_;
// Request data.
std::vector<char> request_data_;
scoped_refptr<net::DrainableIOBuffer> write_buffer_;
scoped_refptr<net::IOBufferWithSize> read_buffer_;
// The activity timer.
scoped_ptr<base::Timer> timer_;
DISALLOW_COPY_AND_ASSIGN(GnubbySocket);
};
} // namespace remoting
#endif // REMOTING_HOST_GNUBBY_SOCKET_H_
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