diff options
Diffstat (limited to 'libraries/logic/net/CacheDownload.cpp')
| -rw-r--r-- | libraries/logic/net/CacheDownload.cpp | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/libraries/logic/net/CacheDownload.cpp b/libraries/logic/net/CacheDownload.cpp new file mode 100644 index 00000000..1ac55180 --- /dev/null +++ b/libraries/logic/net/CacheDownload.cpp @@ -0,0 +1,192 @@ +/* Copyright 2013-2015 MultiMC Contributors + * + * 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 "CacheDownload.h" + +#include <QCryptographicHash> +#include <QFileInfo> +#include <QDateTime> +#include <QDebug> +#include "Env.h" +#include <FileSystem.h> + +CacheDownload::CacheDownload(QUrl url, MetaEntryPtr entry) + : NetAction(), md5sum(QCryptographicHash::Md5) +{ + m_url = url; + m_entry = entry; + m_target_path = entry->getFullPath(); + m_status = Job_NotStarted; +} + +void CacheDownload::start() +{ + m_status = Job_InProgress; + if (!m_entry->isStale()) + { + m_status = Job_Finished; + emit succeeded(m_index_within_job); + return; + } + // create a new save file + m_output_file.reset(new QSaveFile(m_target_path)); + + // if there already is a file and md5 checking is in effect and it can be opened + if (!FS::ensureFilePathExists(m_target_path)) + { + qCritical() << "Could not create folder for " + m_target_path; + m_status = Job_Failed; + emit failed(m_index_within_job); + return; + } + if (!m_output_file->open(QIODevice::WriteOnly)) + { + qCritical() << "Could not open " + m_target_path + " for writing"; + m_status = Job_Failed; + emit failed(m_index_within_job); + return; + } + qDebug() << "Downloading " << m_url.toString(); + QNetworkRequest request(m_url); + + // check file consistency first. + QFile current(m_target_path); + if(current.exists() && current.size() != 0) + { + if (m_entry->getRemoteChangedTimestamp().size()) + request.setRawHeader(QString("If-Modified-Since").toLatin1(), + m_entry->getRemoteChangedTimestamp().toLatin1()); + if (m_entry->getETag().size()) + request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->getETag().toLatin1()); + } + + request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Cached)"); + + auto worker = ENV.qnam(); + QNetworkReply *rep = worker->get(request); + + m_reply.reset(rep); + connect(rep, SIGNAL(downloadProgress(qint64, qint64)), + SLOT(downloadProgress(qint64, qint64))); + connect(rep, SIGNAL(finished()), SLOT(downloadFinished())); + connect(rep, SIGNAL(error(QNetworkReply::NetworkError)), + SLOT(downloadError(QNetworkReply::NetworkError))); + connect(rep, SIGNAL(readyRead()), SLOT(downloadReadyRead())); +} + +void CacheDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal) +{ + m_total_progress = bytesTotal; + m_progress = bytesReceived; + emit netActionProgress(m_index_within_job, bytesReceived, bytesTotal); +} + +void CacheDownload::downloadError(QNetworkReply::NetworkError error) +{ + // error happened during download. + qCritical() << "Failed " << m_url.toString() << " with reason " << error; + m_status = Job_Failed; +} +void CacheDownload::downloadFinished() +{ + QVariant redirect = m_reply->header(QNetworkRequest::LocationHeader); + QString redirectURL; + if(redirect.isValid()) + { + redirectURL = redirect.toString(); + } + // FIXME: This is a hack for https://bugreports.qt-project.org/browse/QTBUG-41061 + else if(m_reply->hasRawHeader("Location")) + { + auto data = m_reply->rawHeader("Location"); + if(data.size() > 2 && data[0] == '/' && data[1] == '/') + redirectURL = m_reply->url().scheme() + ":" + data; + } + if (!redirectURL.isEmpty()) + { + m_url = QUrl(redirect.toString()); + qDebug() << "Following redirect to " << m_url.toString(); + start(); + return; + } + + // if the download succeeded + if (m_status == Job_Failed) + { + m_output_file->cancelWriting(); + m_reply.reset(); + emit failed(m_index_within_job); + return; + } + + // if we wrote any data to the save file, we try to commit the data to the real file. + if (wroteAnyData) + { + // nothing went wrong... + if (m_output_file->commit()) + { + m_status = Job_Finished; + m_entry->setMD5Sum(md5sum.result().toHex().constData()); + } + else + { + qCritical() << "Failed to commit changes to " << m_target_path; + m_output_file->cancelWriting(); + m_reply.reset(); + m_status = Job_Failed; + emit failed(m_index_within_job); + return; + } + } + else + { + m_status = Job_Finished; + } + + // then get rid of the save file + m_output_file.reset(); + + QFileInfo output_file_info(m_target_path); + + m_entry->setETag(m_reply->rawHeader("ETag").constData()); + if (m_reply->hasRawHeader("Last-Modified")) + { + m_entry->setRemoteChangedTimestamp(m_reply->rawHeader("Last-Modified").constData()); + } + m_entry->setLocalChangedTimestamp(output_file_info.lastModified().toUTC().toMSecsSinceEpoch()); + m_entry->setStale(false); + ENV.metacache()->updateEntry(m_entry); + + m_reply.reset(); + emit succeeded(m_index_within_job); + return; +} + +void CacheDownload::downloadReadyRead() +{ + QByteArray ba = m_reply->readAll(); + md5sum.addData(ba); + if (m_output_file->write(ba) != ba.size()) + { + qCritical() << "Failed writing into " + m_target_path; + m_status = Job_Failed; + m_output_file->cancelWriting(); + m_output_file.reset(); + emit failed(m_index_within_job); + wroteAnyData = false; + return; + } + wroteAnyData = true; +} |