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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.
#include "device/serial/data_sender.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
namespace device {
// Represents a send that is not yet fulfilled.
class DataSender::PendingSend {
public:
PendingSend(const base::StringPiece& data,
const DataSentCallback& callback,
const SendErrorCallback& error_callback,
DataSender* sender);
// Reports |fatal_error_value_| to |receive_error_callback_|.
void DispatchFatalError();
// Attempts to send any data not yet sent to |sink|.
void SendData();
private:
// Invoked to report that |num_bytes| of data have been sent and then an
// error, |error| was encountered. Subtracts the number of bytes that were
// part of this send from |num_bytes|. If this send was not completed before
// the error, this calls |error_callback_| to report the error. Otherwise,
// this calls |callback_|. Returns the number of bytes sent but not acked.
void OnDataSent(uint32_t num_bytes, int32_t error);
// The data to send.
const base::StringPiece data_;
// The callback to report success.
const DataSentCallback callback_;
// The callback to report errors.
const SendErrorCallback error_callback_;
// The DataSender that owns this PendingSend.
DataSender* sender_;
};
DataSender::DataSender(mojo::InterfacePtr<serial::DataSink> sink,
uint32_t buffer_size,
int32_t fatal_error_value)
: sink_(std::move(sink)),
fatal_error_value_(fatal_error_value),
shut_down_(false) {
sink_.set_connection_error_handler(
base::Bind(&DataSender::OnConnectionError, base::Unretained(this)));
}
DataSender::~DataSender() {
ShutDown();
}
bool DataSender::Send(const base::StringPiece& data,
const DataSentCallback& callback,
const SendErrorCallback& error_callback) {
DCHECK(!callback.is_null() && !error_callback.is_null());
if (!pending_cancel_.is_null() || shut_down_)
return false;
linked_ptr<PendingSend> pending_send(
new PendingSend(data, callback, error_callback, this));
pending_send->SendData();
sends_awaiting_ack_.push(pending_send);
return true;
}
bool DataSender::Cancel(int32_t error, const CancelCallback& callback) {
DCHECK(!callback.is_null());
if (!pending_cancel_.is_null() || shut_down_)
return false;
if (sends_awaiting_ack_.empty()) {
base::MessageLoop::current()->PostTask(FROM_HERE, callback);
return true;
}
pending_cancel_ = callback;
sink_->Cancel(error);
return true;
}
void DataSender::SendComplete() {
if (shut_down_)
return;
DCHECK(!sends_awaiting_ack_.empty());
sends_awaiting_ack_.pop();
if (sends_awaiting_ack_.empty())
RunCancelCallback();
}
void DataSender::SendFailed(int32_t error) {
if (shut_down_)
return;
DCHECK(!sends_awaiting_ack_.empty());
sends_awaiting_ack_.pop();
if (!sends_awaiting_ack_.empty())
return;
sink_->ClearError();
RunCancelCallback();
}
void DataSender::OnConnectionError() {
ShutDown();
}
void DataSender::RunCancelCallback() {
DCHECK(sends_awaiting_ack_.empty());
if (pending_cancel_.is_null())
return;
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(pending_cancel_));
pending_cancel_.Reset();
}
void DataSender::ShutDown() {
shut_down_ = true;
while (!sends_awaiting_ack_.empty()) {
sends_awaiting_ack_.front()->DispatchFatalError();
sends_awaiting_ack_.pop();
}
RunCancelCallback();
}
DataSender::PendingSend::PendingSend(const base::StringPiece& data,
const DataSentCallback& callback,
const SendErrorCallback& error_callback,
DataSender* sender)
: data_(data),
callback_(callback),
error_callback_(error_callback),
sender_(sender) {
}
void DataSender::PendingSend::OnDataSent(uint32_t num_bytes, int32_t error) {
if (error) {
base::MessageLoop::current()->PostTask(
FROM_HERE, base::Bind(error_callback_, num_bytes, error));
sender_->SendFailed(error);
} else {
DCHECK(num_bytes == data_.size());
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback_, num_bytes));
sender_->SendComplete();
}
}
void DataSender::PendingSend::DispatchFatalError() {
base::MessageLoop::current()->PostTask(
FROM_HERE, base::Bind(error_callback_, 0, sender_->fatal_error_value_));
}
void DataSender::PendingSend::SendData() {
uint32_t num_bytes_to_send = static_cast<uint32_t>(data_.size());
mojo::Array<uint8_t> bytes(num_bytes_to_send);
memcpy(&bytes[0], data_.data(), num_bytes_to_send);
sender_->sink_->OnData(
std::move(bytes),
base::Bind(&DataSender::PendingSend::OnDataSent, base::Unretained(this)));
}
} // namespace device
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