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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 DEVICE_SERIAL_DATA_SENDER_H_
#define DEVICE_SERIAL_DATA_SENDER_H_
#include <queue>
#include "base/callback.h"
#include "base/memory/linked_ptr.h"
#include "base/strings/string_piece.h"
#include "device/serial/buffer.h"
#include "device/serial/data_stream.mojom.h"
#include "mojo/public/cpp/system/data_pipe.h"
namespace device {
// A DataSender sends data to a DataSink.
class DataSender {
public:
typedef base::Callback<void(uint32_t bytes_sent)> DataSentCallback;
typedef base::Callback<void(uint32_t bytes_sent, int32_t error)>
SendErrorCallback;
typedef base::Callback<void()> CancelCallback;
// Constructs a DataSender to send data to |sink|, using a buffer size of
// |buffer_size|, with connection errors reported as |fatal_error_value|.
DataSender(mojo::InterfacePtr<serial::DataSink> sink,
uint32_t buffer_size,
int32_t fatal_error_value);
~DataSender();
// Starts an asynchronous send of |data|. If the send completes successfully,
// |callback| will be called. Otherwise, |error_callback| will be called with
// the error. If there is a cancel in progress or there has been a connection
// error, this will not start a send and returns false. It is the caller's
// responsibility to ensure |data| remains valid until one of |callback| and
// |error_callback| is called.
bool Send(const base::StringPiece& data,
const DataSentCallback& callback,
const SendErrorCallback& error_callback);
// Requests the cancellation of any in-progress sends. Calls to Send() will
// fail until |callback| is called.
bool Cancel(int32_t error, const CancelCallback& callback);
private:
class PendingSend;
// Invoked when a PendingSend completes.
void SendComplete();
// Invoked when a PendingSend fails with |error|.
void SendFailed(int32_t error);
// mojo error handler
void OnConnectionError();
// Dispatches a cancel callback if one is pending.
void RunCancelCallback();
// Shuts down this DataSender and dispatches fatal errors to all pending
// operations.
void ShutDown();
// The control connection to the data sink.
mojo::InterfacePtr<serial::DataSink> sink_;
// The error value to report in the event of a fatal error.
const int32_t fatal_error_value_;
// A queue of PendingSend that have been sent to |sink_|, but have not yet
// been acked by the DataSink.
std::queue<linked_ptr<PendingSend>> sends_awaiting_ack_;
// The callback to report cancel completion if a cancel operation is in
// progress.
CancelCallback pending_cancel_;
// Whether we have encountered a fatal error and shut down.
bool shut_down_;
DISALLOW_COPY_AND_ASSIGN(DataSender);
};
} // namespace device
#endif // DEVICE_SERIAL_DATA_SENDER_H_
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