NOISSUE refactor *Download into more, smaller pieces
* Download is now Download. * Download uses Sink subclasses to process various events. * Validators can be used to further customize the Sink behaviour.
This commit is contained in:
Petr Mrázek
199
api/logic/net/Download.cpp
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199
api/logic/net/Download.cpp
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/* Copyright 2013-2015 MultiMC Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Download.h"
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#include <QFileInfo>
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#include <QDateTime>
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#include <QDebug>
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#include "Env.h"
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#include <FileSystem.h>
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#include "ChecksumValidator.h"
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#include "MetaCacheSink.h"
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#include "ByteArraySink.h"
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namespace Net {
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Download::Download():NetAction()
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{
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m_status = Job_NotStarted;
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}
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Download::Ptr Download::makeCached(QUrl url, MetaEntryPtr entry)
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{
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Download * dl = new Download();
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dl->m_url = url;
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auto md5Node = new ChecksumValidator(QCryptographicHash::Md5);
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auto cachedNode = new MetaCacheSink(entry, md5Node);
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dl->m_sink.reset(cachedNode);
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dl->m_target_path = entry->getFullPath();
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return std::shared_ptr<Download>(dl);
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}
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Download::Ptr Download::makeByteArray(QUrl url, QByteArray *output)
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{
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Download * dl = new Download();
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dl->m_url = url;
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dl->m_sink.reset(new ByteArraySink(output));
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return std::shared_ptr<Download>(dl);
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}
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Download::Ptr Download::makeFile(QUrl url, QString path)
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{
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Download * dl = new Download();
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dl->m_url = url;
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dl->m_sink.reset(new FileSink(path));
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return std::shared_ptr<Download>(dl);
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}
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void Download::addValidator(Validator * v)
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{
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m_sink->addValidator(v);
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}
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void Download::start()
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{
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QNetworkRequest request(m_url);
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m_status = m_sink->init(request);
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switch(m_status)
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{
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case Job_Finished:
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emit succeeded(m_index_within_job);
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qDebug() << "Download cache hit " << m_url.toString();
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return;
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case Job_InProgress:
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qDebug() << "Downloading " << m_url.toString();
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break;
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case Job_NotStarted:
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case Job_Failed:
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emit failed(m_index_within_job);
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return;
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}
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request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0");
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auto worker = ENV.qnam();
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QNetworkReply *rep = worker->get(request);
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m_reply.reset(rep);
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connect(rep, SIGNAL(downloadProgress(qint64, qint64)), SLOT(downloadProgress(qint64, qint64)));
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connect(rep, SIGNAL(finished()), SLOT(downloadFinished()));
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connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), SLOT(downloadError(QNetworkReply::NetworkError)));
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connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead()));
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}
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void Download::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
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{
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m_total_progress = bytesTotal;
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m_progress = bytesReceived;
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emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal);
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}
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void Download::downloadError(QNetworkReply::NetworkError error)
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{
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// error happened during download.
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qCritical() << "Failed " << m_url.toString() << " with reason " << error;
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m_status = Job_Failed;
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}
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bool Download::handleRedirect()
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{
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QVariant redirect = m_reply->header(QNetworkRequest::LocationHeader);
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QString redirectURL;
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if(redirect.isValid())
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{
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redirectURL = redirect.toString();
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}
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// FIXME: This is a hack for https://bugreports.qt-project.org/browse/QTBUG-41061
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else if(m_reply->hasRawHeader("Location"))
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{
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auto data = m_reply->rawHeader("Location");
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if(data.size() > 2 && data[0] == '/' && data[1] == '/')
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{
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redirectURL = m_reply->url().scheme() + ":" + data;
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}
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}
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if (!redirectURL.isEmpty())
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{
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m_url = QUrl(redirect.toString());
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qDebug() << "Following redirect to " << m_url.toString();
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start();
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return true;
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}
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return false;
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}
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void Download::downloadFinished()
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{
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// handle HTTP redirection first
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if(handleRedirect())
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{
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qDebug() << "Download redirected:" << m_url.toString();
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return;
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}
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// if the download failed before this point ...
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if (m_status == Job_Failed)
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{
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qDebug() << "Download failed in previous step:" << m_url.toString();
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m_sink->abort();
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m_reply.reset();
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emit failed(m_index_within_job);
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return;
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}
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// make sure we got all the remaining data, if any
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auto data = m_reply->readAll();
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if(data.size())
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{
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qDebug() << "Writing extra" << data.size() << "bytes to" << m_target_path;
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m_status = m_sink->write(data);
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}
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// otherwise, finalize the whole graph
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m_status = m_sink->finalize(*m_reply.get());
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if (m_status != Job_Finished)
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{
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qDebug() << "Download failed to finalize:" << m_url.toString();
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m_sink->abort();
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m_reply.reset();
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emit failed(m_index_within_job);
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return;
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}
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m_reply.reset();
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qDebug() << "Download succeeded:" << m_url.toString();
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emit succeeded(m_index_within_job);
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}
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void Download::downloadReadyRead()
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{
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if(m_status == Job_InProgress)
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{
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auto data = m_reply->readAll();
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m_status = m_sink->write(data);
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if(m_status == Job_Failed)
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{
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qCritical() << "Failed to process response chunk for " << m_target_path;
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}
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// qDebug() << "Download" << m_url.toString() << "gained" << data.size() << "bytes";
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}
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else
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{
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qCritical() << "Cannot write to " << m_target_path << ", illegal status" << m_status;
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}
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}
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}
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