pollymc/logic/net/ForgeXzDownload.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 "MultiMC.h"
#include "ForgeXzDownload.h"
#include <pathutils.h>
#include <QCryptographicHash>
#include <QFileInfo>
#include <QDateTime>
#include "logger/QsLog.h"
ForgeXzDownload::ForgeXzDownload(QUrl url, MetaEntryPtr entry) : NetAction()
{
QString urlstr = url.toString();
urlstr.append(".pack.xz");
m_url = QUrl(urlstr);
m_entry = entry;
m_target_path = entry->getFullPath();
m_status = Job_NotStarted;
m_opened_for_saving = false;
}
void ForgeXzDownload::start()
{
if (!m_entry->stale)
{
emit succeeded(index_within_job);
return;
}
// can we actually create the real, final file?
if (!ensureFilePathExists(m_target_path))
{
emit failed(index_within_job);
return;
}
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QLOG_INFO() << "Downloading " << m_url.toString();
QNetworkRequest request(m_url);
request.setRawHeader(QString("If-None-Match").toLatin1(), m_entry->etag.toLatin1());
request.setHeader(QNetworkRequest::UserAgentHeader, "MultiMC/5.0 (Cached)");
auto worker = MMC->qnam();
QNetworkReply *rep = worker->get(request);
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m_reply = std::shared_ptr<QNetworkReply>(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 ForgeXzDownload::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)
{
emit progress(index_within_job, bytesReceived, bytesTotal);
}
void ForgeXzDownload::downloadError(QNetworkReply::NetworkError error)
{
// error happened during download.
// TODO: log the reason why
m_status = Job_Failed;
}
void ForgeXzDownload::downloadFinished()
{
// if the download succeeded
if (m_status != Job_Failed)
{
// nothing went wrong...
m_status = Job_Finished;
if (m_opened_for_saving)
{
// we actually downloaded something! process and isntall it
decompressAndInstall();
return;
}
else
{
// something bad happened
m_pack200_xz_file.remove();
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m_reply.reset();
emit failed(index_within_job);
return;
}
}
// else the download failed
else
{
m_pack200_xz_file.close();
m_pack200_xz_file.remove();
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m_reply.reset();
emit failed(index_within_job);
return;
}
}
void ForgeXzDownload::downloadReadyRead()
{
if (!m_opened_for_saving)
{
if (!m_pack200_xz_file.open())
{
/*
* Can't open the file... the job failed
*/
m_reply->abort();
emit failed(index_within_job);
return;
}
m_opened_for_saving = true;
}
m_pack200_xz_file.write(m_reply->readAll());
}
#include "xz.h"
#include "unpack200.h"
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#include <stdexcept>
const size_t buffer_size = 8196;
void ForgeXzDownload::decompressAndInstall()
{
// rewind the downloaded temp file
m_pack200_xz_file.seek(0);
// de-xz'd file
QTemporaryFile pack200_file;
pack200_file.open();
bool xz_success = false;
// first, de-xz
{
uint8_t in[buffer_size];
uint8_t out[buffer_size];
struct xz_buf b;
struct xz_dec *s;
enum xz_ret ret;
xz_crc32_init();
xz_crc64_init();
s = xz_dec_init(XZ_DYNALLOC, 1 << 26);
if (s == nullptr)
{
xz_dec_end(s);
emit failed(index_within_job);
return;
}
b.in = in;
b.in_pos = 0;
b.in_size = 0;
b.out = out;
b.out_pos = 0;
b.out_size = buffer_size;
while (!xz_success)
{
if (b.in_pos == b.in_size)
{
b.in_size = m_pack200_xz_file.read((char *)in, sizeof(in));
b.in_pos = 0;
}
ret = xz_dec_run(s, &b);
if (b.out_pos == sizeof(out))
{
if (pack200_file.write((char *)out, b.out_pos) != b.out_pos)
{
// msg = "Write error\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
}
b.out_pos = 0;
}
if (ret == XZ_OK)
continue;
if (ret == XZ_UNSUPPORTED_CHECK)
{
// unsupported check. this is OK, but we should log this
continue;
}
if (pack200_file.write((char *)out, b.out_pos) != b.out_pos)
{
// write error
pack200_file.close();
xz_dec_end(s);
return;
}
switch (ret)
{
case XZ_STREAM_END:
xz_dec_end(s);
xz_success = true;
break;
case XZ_MEM_ERROR:
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QLOG_ERROR() << "Memory allocation failed\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
case XZ_MEMLIMIT_ERROR:
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QLOG_ERROR() << "Memory usage limit reached\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
case XZ_FORMAT_ERROR:
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QLOG_ERROR() << "Not a .xz file\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
case XZ_OPTIONS_ERROR:
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QLOG_ERROR() << "Unsupported options in the .xz headers\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
case XZ_DATA_ERROR:
case XZ_BUF_ERROR:
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QLOG_ERROR() << "File is corrupt\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
default:
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QLOG_ERROR() << "Bug!\n";
xz_dec_end(s);
emit failed(index_within_job);
return;
}
}
}
// revert pack200
pack200_file.close();
QString pack_name = pack200_file.fileName();
try
{
unpack_200(pack_name.toStdString(), m_target_path.toStdString());
}
catch (std::runtime_error &err)
{
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QLOG_ERROR() << "Error unpacking " << pack_name.toUtf8() << " : " << err.what();
QFile f(m_target_path);
if (f.exists())
f.remove();
emit failed(index_within_job);
return;
}
QFile jar_file(m_target_path);
if (!jar_file.open(QIODevice::ReadOnly))
{
jar_file.remove();
emit failed(index_within_job);
return;
}
m_entry->md5sum = QCryptographicHash::hash(jar_file.readAll(), QCryptographicHash::Md5)
.toHex()
.constData();
jar_file.close();
QFileInfo output_file_info(m_target_path);
m_entry->etag = m_reply->rawHeader("ETag").constData();
m_entry->local_changed_timestamp =
output_file_info.lastModified().toUTC().toMSecsSinceEpoch();
m_entry->stale = false;
MMC->metacache()->updateEntry(m_entry);
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m_reply.reset();
emit succeeded(index_within_job);
}