pollymc/logic/updater/DownloadUpdateTask.cpp

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/* Copyright 2013 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 "DownloadUpdateTask.h"
#include "MultiMC.h"
#include "logic/updater/UpdateChecker.h"
#include "logic/net/NetJob.h"
#include "pathutils.h"
#include <QFile>
#include <QTemporaryDir>
#include <QCryptographicHash>
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#include <QDomDocument>
DownloadUpdateTask::DownloadUpdateTask(QString repoUrl, int versionId, QObject* parent) :
Task(parent)
{
m_cVersionId = MMC->version().build;
m_nRepoUrl = repoUrl;
m_nVersionId = versionId;
m_updateFilesDir.setAutoRemove(false);
}
void DownloadUpdateTask::executeTask()
{
// GO!
// This will call the next step when it's done.
findCurrentVersionInfo();
}
void DownloadUpdateTask::findCurrentVersionInfo()
{
setStatus(tr("Finding information about the current version."));
auto checker = MMC->updateChecker();
// This runs after we've tried loading the channel list.
// If the channel list doesn't need to be loaded, this will be called immediately.
// If the channel list does need to be loaded, this will be called when it's done.
auto processFunc = [this, &checker] () -> void
{
// Now, check the channel list again.
if (checker->hasChannels())
{
// We still couldn't load the channel list. Give up. Call loadVersionInfo and return.
QLOG_INFO() << "Reloading the channel list didn't work. Giving up.";
loadVersionInfo();
return;
}
QList<UpdateChecker::ChannelListEntry> channels = checker->getChannelList();
QString channelId = MMC->version().channel;
// Search through the channel list for a channel with the correct ID.
for (auto channel : channels)
{
if (channel.id == channelId)
{
QLOG_INFO() << "Found matching channel.";
m_cRepoUrl = channel.url;
break;
}
}
// Now that we've done that, load version info.
loadVersionInfo();
};
if (checker->hasChannels())
{
// Load the channel list and wait for it to finish loading.
QLOG_INFO() << "No channel list entries found. Will try reloading it.";
QObject::connect(checker.get(), &UpdateChecker::channelListLoaded, processFunc);
checker->updateChanList();
}
else
{
processFunc();
}
}
void DownloadUpdateTask::loadVersionInfo()
{
setStatus(tr("Loading version information."));
// Create the net job for loading version info.
NetJob* netJob = new NetJob("Version Info");
// Find the index URL.
QUrl newIndexUrl = QUrl(m_nRepoUrl).resolved(QString::number(m_nVersionId) + ".json");
// Add a net action to download the version info for the version we're updating to.
netJob->addNetAction(ByteArrayDownload::make(newIndexUrl));
// If we have a current version URL, get that one too.
if (!m_cRepoUrl.isEmpty())
{
QUrl cIndexUrl = QUrl(m_cRepoUrl).resolved(QString::number(m_cVersionId) + ".json");
netJob->addNetAction(ByteArrayDownload::make(cIndexUrl));
}
// Connect slots so we know when it's done.
QObject::connect(netJob, &NetJob::succeeded, this, &DownloadUpdateTask::vinfoDownloadFinished);
QObject::connect(netJob, &NetJob::failed, this, &DownloadUpdateTask::vinfoDownloadFailed);
// Store the NetJob in a class member. We don't want to lose it!
m_vinfoNetJob.reset(netJob);
// Finally, we start the network job and the thread's event loop to wait for it to finish.
netJob->start();
}
void DownloadUpdateTask::vinfoDownloadFinished()
{
// Both downloads succeeded. OK. Parse stuff.
parseDownloadedVersionInfo();
}
void DownloadUpdateTask::vinfoDownloadFailed()
{
// Something failed. We really need the second download (current version info), so parse downloads anyways as long as the first one succeeded.
if (m_vinfoNetJob->first()->m_status != Job_Failed)
{
parseDownloadedVersionInfo();
return;
}
// TODO: Give a more detailed error message.
QLOG_ERROR() << "Failed to download version info files.";
emitFailed(tr("Failed to download version info files."));
}
void DownloadUpdateTask::parseDownloadedVersionInfo()
{
setStatus(tr("Reading file lists."));
parseVersionInfo(NEW_VERSION, &m_nVersionFileList);
// If there is a second entry in the network job's list, load it as the current version's info.
if (m_vinfoNetJob->size() >= 2 && m_vinfoNetJob->operator[](1)->m_status != Job_Failed)
{
parseVersionInfo(CURRENT_VERSION, &m_cVersionFileList);
}
// We don't need this any more.
m_vinfoNetJob.reset();
// Now that we're done loading version info, we can move on to the next step. Process file lists and download files.
processFileLists();
}
void DownloadUpdateTask::parseVersionInfo(VersionInfoFileEnum vfile, VersionFileList* list)
{
if (vfile == CURRENT_VERSION) setStatus(tr("Reading file list for current version."));
else if (vfile == NEW_VERSION) setStatus(tr("Reading file list for new version."));
QLOG_DEBUG() << "Reading file list for" << (vfile == NEW_VERSION ? "new" : "current") << "version.";
QByteArray data;
{
ByteArrayDownloadPtr dl = std::dynamic_pointer_cast<ByteArrayDownload>(
vfile == NEW_VERSION ? m_vinfoNetJob->first() : m_vinfoNetJob->operator[](1));
data = dl->m_data;
}
QJsonParseError jsonError;
QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
if (jsonError.error != QJsonParseError::NoError)
{
QLOG_ERROR() << "Failed to parse version info JSON:" << jsonError.errorString() << "at" << jsonError.offset;
return;
}
QJsonObject json = jsonDoc.object();
QLOG_DEBUG() << "Loading version info from JSON.";
QJsonArray filesArray = json.value("Files").toArray();
for (QJsonValue fileValue : filesArray)
{
QJsonObject fileObj = fileValue.toObject();
VersionFileEntry file{
fileObj.value("Path").toString(),
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fileObj.value("Perms").toVariant().toInt(),
FileSourceList(),
fileObj.value("MD5").toString(),
};
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QLOG_DEBUG() << "File" << file.path << "with perms" << file.mode;
QJsonArray sourceArray = fileObj.value("Sources").toArray();
for (QJsonValue val : sourceArray)
{
QJsonObject sourceObj = val.toObject();
QString type = sourceObj.value("SourceType").toString();
if (type == "http")
{
file.sources.append(FileSource("http", sourceObj.value("Url").toString()));
}
else if (type == "httpc")
{
file.sources.append(FileSource("httpc", sourceObj.value("Url").toString(), sourceObj.value("CompressionType").toString()));
}
else
{
QLOG_WARN() << "Unknown source type" << type << "ignored.";
}
}
QLOG_DEBUG() << "Loaded info for" << file.path;
list->append(file);
}
}
void DownloadUpdateTask::processFileLists()
{
setStatus(tr("Processing file lists. Figuring out how to install the update."));
// First, if we've loaded the current version's file list, we need to iterate through it and
// delete anything in the current one version's list that isn't in the new version's list.
for (VersionFileEntry entry : m_cVersionFileList)
{
bool keep = false;
for (VersionFileEntry newEntry : m_nVersionFileList)
{
if (newEntry.path == entry.path)
{
QLOG_DEBUG() << "Not deleting" << entry.path << "because it is still present in the new version.";
keep = true;
break;
}
}
// If the loop reaches the end and we didn't find a match, delete the file.
if(!keep)
m_operationList.append(UpdateOperation::DeleteOp(entry.path));
}
// Create a network job for downloading files.
NetJob* netJob = new NetJob("Update Files");
// Next, check each file in MultiMC's folder and see if we need to update them.
for (VersionFileEntry entry : m_nVersionFileList)
{
// TODO: Let's not MD5sum a ton of files on the GUI thread. We should probably find a way to do this in the background.
QString fileMD5;
QFile entryFile(entry.path);
if (entryFile.open(QFile::ReadOnly))
{
QCryptographicHash hash(QCryptographicHash::Md5);
hash.addData(entryFile.readAll());
fileMD5 = hash.result().toHex();
}
if (!entryFile.exists() || fileMD5.isEmpty() || fileMD5 != entry.md5)
{
QLOG_DEBUG() << "Found file" << entry.path << "that needs updating.";
// Go through the sources list and find one to use.
// TODO: Make a NetAction that takes a source list and tries each of them until one works. For now, we'll just use the first http one.
for (FileSource source : entry.sources)
{
if (source.type == "http")
{
QLOG_DEBUG() << "Will download" << entry.path << "from" << source.url;
// Download it to updatedir/<filepath>-<md5> where filepath is the file's path with slashes replaced by underscores.
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QString dlPath = PathCombine(m_updateFilesDir.path(), QString(entry.path).replace("/", "_"));
// We need to download the file to the updatefiles folder and add a task to copy it to its install path.
auto download = MD5EtagDownload::make(source.url, dlPath);
download->m_check_md5 = true;
download->m_expected_md5 = entry.md5;
netJob->addNetAction(download);
// Now add a copy operation to our operations list to install the file.
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m_operationList.append(UpdateOperation::CopyOp(dlPath, entry.path, entry.mode));
}
}
}
}
// Add listeners to wait for the downloads to finish.
QObject::connect(netJob, &NetJob::succeeded, this, &DownloadUpdateTask::fileDownloadFinished);
QObject::connect(netJob, &NetJob::progress, this, &DownloadUpdateTask::fileDownloadProgressChanged);
QObject::connect(netJob, &NetJob::failed, this, &DownloadUpdateTask::fileDownloadFailed);
// Now start the download.
setStatus(tr("Downloading %1 update files.").arg(QString::number(netJob->size())));
QLOG_DEBUG() << "Begin downloading update files to" << m_updateFilesDir.path();
m_filesNetJob.reset(netJob);
netJob->start();
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writeInstallScript(m_operationList, PathCombine(m_updateFilesDir.path(), "file_list.xml"));
}
void DownloadUpdateTask::writeInstallScript(UpdateOperationList& opsList, QString scriptFile)
{
// Build the base structure of the XML document.
QDomDocument doc;
QDomElement root = doc.createElement("update");
root.setAttribute("version", "3");
doc.appendChild(root);
QDomElement installFiles = doc.createElement("install");
root.appendChild(installFiles);
QDomElement removeFiles = doc.createElement("uninstall");
root.appendChild(removeFiles);
// Write the operation list to the XML document.
for (UpdateOperation op : opsList)
{
QDomElement file = doc.createElement("file");
switch (op.type)
{
case UpdateOperation::OP_COPY:
{
// Install the file.
QDomElement name = doc.createElement("source");
QDomElement path = doc.createElement("dest");
QDomElement mode = doc.createElement("mode");
name.appendChild(doc.createTextNode(op.file));
path.appendChild(doc.createTextNode(op.dest));
// We need to add a 0 at the beginning here, because Qt doesn't convert to octal correctly.
mode.appendChild(doc.createTextNode("0" + QString::number(op.mode, 8)));
file.appendChild(name);
file.appendChild(path);
file.appendChild(mode);
installFiles.appendChild(file);
QLOG_DEBUG() << "Will install file" << op.file;
}
break;
case UpdateOperation::OP_DELETE:
{
// Delete the file.
file.appendChild(doc.createTextNode(op.file));
removeFiles.appendChild(file);
QLOG_DEBUG() << "Will remove file" << op.file;
}
break;
default:
QLOG_WARN() << "Can't write update operation of type" << op.type << "to file. Not implemented.";
continue;
}
}
// Write the XML document to the file.
QFile outFile(scriptFile);
if (outFile.open(QIODevice::WriteOnly))
{
outFile.write(doc.toByteArray());
}
else
{
emitFailed(tr("Failed to write update script file."));
}
}
void DownloadUpdateTask::fileDownloadFinished()
{
emitSucceeded();
}
void DownloadUpdateTask::fileDownloadFailed()
{
// TODO: Give more info about the failure.
QLOG_ERROR() << "Failed to download update files.";
emitFailed(tr("Failed to download update files."));
}
void DownloadUpdateTask::fileDownloadProgressChanged(qint64 current, qint64 total)
{
setProgress((int)(((float)current / (float)total)*100));
}
QString DownloadUpdateTask::updateFilesDir()
{
return m_updateFilesDir.path();
}