strawberry-audio-player-win.../ext/libstrawberry-common/core/messagehandler.cpp

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/* This file is part of Strawberry.
Copyright 2011, David Sansome <me@davidsansome.com>
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Copyright 2018-2021, Jonas Kvinge <jonas@jkvinge.net>
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "messagehandler.h"
#include <QObject>
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#include <QAbstractSocket>
#include <QDataStream>
#include <QIODevice>
#include <QLocalSocket>
#include <QByteArray>
#include "core/logging.h"
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_MessageHandlerBase::_MessageHandlerBase(QIODevice *device, QObject *parent)
: QObject(parent),
device_(nullptr),
flush_abstract_socket_(nullptr),
flush_local_socket_(nullptr),
reading_protobuf_(false),
expected_length_(0),
is_device_closed_(false) {
if (device) {
SetDevice(device);
}
}
void _MessageHandlerBase::SetDevice(QIODevice *device) {
device_ = device;
buffer_.open(QIODevice::ReadWrite);
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QObject::connect(device, &QIODevice::readyRead, this, &_MessageHandlerBase::DeviceReadyRead);
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// Yeah I know.
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if (QAbstractSocket *abstractsocket = qobject_cast<QAbstractSocket*>(device)) {
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flush_abstract_socket_ = &QAbstractSocket::flush;
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QObject::connect(abstractsocket, &QAbstractSocket::disconnected, this, &_MessageHandlerBase::DeviceClosed);
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}
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else if (QLocalSocket *localsocket = qobject_cast<QLocalSocket*>(device)) {
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flush_local_socket_ = &QLocalSocket::flush;
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QObject::connect(localsocket, &QLocalSocket::disconnected, this, &_MessageHandlerBase::DeviceClosed);
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}
else {
qFatal("Unsupported device type passed to _MessageHandlerBase");
}
}
void _MessageHandlerBase::DeviceReadyRead() {
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while (device_->bytesAvailable() > 0) {
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if (!reading_protobuf_) {
// Read the length of the next message
QDataStream s(device_);
s >> expected_length_;
reading_protobuf_ = true;
}
// Read some of the message
buffer_.write(device_->read(expected_length_ - buffer_.size()));
// Did we get everything?
if (buffer_.size() == expected_length_) {
// Parse the message
if (!RawMessageArrived(buffer_.data())) {
qLog(Error) << "Malformed protobuf message";
device_->close();
return;
}
// Clear the buffer
buffer_.close();
buffer_.setData(QByteArray());
buffer_.open(QIODevice::ReadWrite);
reading_protobuf_ = false;
}
}
}
void _MessageHandlerBase::WriteMessage(const QByteArray &data) {
QDataStream s(device_);
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s << static_cast<quint32>(data.length());
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s.writeRawData(data.data(), static_cast<int>(data.length()));
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// Sorry.
if (flush_abstract_socket_) {
((qobject_cast<QAbstractSocket*>(device_))->*(flush_abstract_socket_))();
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}
else if (flush_local_socket_) {
((qobject_cast<QLocalSocket*>(device_))->*(flush_local_socket_))();
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}
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}
void _MessageHandlerBase::DeviceClosed() {
is_device_closed_ = true;
AbortAll();
}