274 lines
6.9 KiB
C++
274 lines
6.9 KiB
C++
/* 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 "Env.h"
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#include "HttpMetaCache.h"
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#include "FileSystem.h"
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#include <QFileInfo>
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#include <QFile>
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#include <QDateTime>
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#include <QCryptographicHash>
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#include <QDebug>
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#include <QJsonDocument>
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#include <QJsonArray>
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#include <QJsonObject>
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QString MetaEntry::getFullPath()
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{
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// FIXME: make local?
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return FS::PathCombine(basePath, relativePath);
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}
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HttpMetaCache::HttpMetaCache(QString path) : QObject()
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{
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m_index_file = path;
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saveBatchingTimer.setSingleShot(true);
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saveBatchingTimer.setTimerType(Qt::VeryCoarseTimer);
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connect(&saveBatchingTimer, SIGNAL(timeout()), SLOT(SaveNow()));
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}
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HttpMetaCache::~HttpMetaCache()
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{
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saveBatchingTimer.stop();
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SaveNow();
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}
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MetaEntryPtr HttpMetaCache::getEntry(QString base, QString resource_path)
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{
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// no base. no base path. can't store
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if (!m_entries.contains(base))
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{
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// TODO: log problem
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return MetaEntryPtr();
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}
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EntryMap &map = m_entries[base];
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if (map.entry_list.contains(resource_path))
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{
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return map.entry_list[resource_path];
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}
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return MetaEntryPtr();
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}
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MetaEntryPtr HttpMetaCache::resolveEntry(QString base, QString resource_path, QString expected_etag)
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{
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auto entry = getEntry(base, resource_path);
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// it's not present? generate a default stale entry
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if (!entry)
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{
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return staleEntry(base, resource_path);
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}
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auto &selected_base = m_entries[base];
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QString real_path = FS::PathCombine(selected_base.base_path, resource_path);
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QFileInfo finfo(real_path);
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// is the file really there? if not -> stale
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if (!finfo.isFile() || !finfo.isReadable())
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{
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// if the file doesn't exist, we disown the entry
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selected_base.entry_list.remove(resource_path);
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return staleEntry(base, resource_path);
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}
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if (!expected_etag.isEmpty() && expected_etag != entry->etag)
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{
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// if the etag doesn't match expected, we disown the entry
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selected_base.entry_list.remove(resource_path);
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return staleEntry(base, resource_path);
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}
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// if the file changed, check md5sum
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qint64 file_last_changed = finfo.lastModified().toUTC().toMSecsSinceEpoch();
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if (file_last_changed != entry->local_changed_timestamp)
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{
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QFile input(real_path);
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input.open(QIODevice::ReadOnly);
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QString md5sum = QCryptographicHash::hash(input.readAll(), QCryptographicHash::Md5)
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.toHex()
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.constData();
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if (entry->md5sum != md5sum)
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{
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selected_base.entry_list.remove(resource_path);
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return staleEntry(base, resource_path);
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}
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// md5sums matched... keep entry and save the new state to file
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entry->local_changed_timestamp = file_last_changed;
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SaveEventually();
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}
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// entry passed all the checks we cared about.
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entry->basePath = getBasePath(base);
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return entry;
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}
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bool HttpMetaCache::updateEntry(MetaEntryPtr stale_entry)
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{
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if (!m_entries.contains(stale_entry->baseId))
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{
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qCritical() << "Cannot add entry with unknown base: "
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<< stale_entry->baseId.toLocal8Bit();
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return false;
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}
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if (stale_entry->stale)
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{
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qCritical() << "Cannot add stale entry: " << stale_entry->getFullPath().toLocal8Bit();
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return false;
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}
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m_entries[stale_entry->baseId].entry_list[stale_entry->relativePath] = stale_entry;
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SaveEventually();
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return true;
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}
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bool HttpMetaCache::evictEntry(MetaEntryPtr entry)
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{
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if(entry)
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{
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entry->stale = true;
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SaveEventually();
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return true;
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}
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return false;
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}
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MetaEntryPtr HttpMetaCache::staleEntry(QString base, QString resource_path)
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{
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auto foo = new MetaEntry();
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foo->baseId = base;
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foo->basePath = getBasePath(base);
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foo->relativePath = resource_path;
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foo->stale = true;
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return MetaEntryPtr(foo);
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}
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void HttpMetaCache::addBase(QString base, QString base_root)
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{
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// TODO: report error
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if (m_entries.contains(base))
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return;
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// TODO: check if the base path is valid
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EntryMap foo;
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foo.base_path = base_root;
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m_entries[base] = foo;
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}
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QString HttpMetaCache::getBasePath(QString base)
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{
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if (m_entries.contains(base))
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{
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return m_entries[base].base_path;
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}
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return QString();
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}
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void HttpMetaCache::Load()
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{
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if(m_index_file.isNull())
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return;
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QFile index(m_index_file);
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if (!index.open(QIODevice::ReadOnly))
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return;
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QJsonDocument json = QJsonDocument::fromJson(index.readAll());
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if (!json.isObject())
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return;
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auto root = json.object();
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// check file version first
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auto version_val = root.value("version");
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if (!version_val.isString())
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return;
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if (version_val.toString() != "1")
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return;
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// read the entry array
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auto entries_val = root.value("entries");
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if (!entries_val.isArray())
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return;
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QJsonArray array = entries_val.toArray();
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for (auto element : array)
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{
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if (!element.isObject())
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return;
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auto element_obj = element.toObject();
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QString base = element_obj.value("base").toString();
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if (!m_entries.contains(base))
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continue;
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auto &entrymap = m_entries[base];
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auto foo = new MetaEntry();
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foo->baseId = base;
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QString path = foo->relativePath = element_obj.value("path").toString();
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foo->md5sum = element_obj.value("md5sum").toString();
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foo->etag = element_obj.value("etag").toString();
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foo->local_changed_timestamp = element_obj.value("last_changed_timestamp").toDouble();
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foo->remote_changed_timestamp =
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element_obj.value("remote_changed_timestamp").toString();
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// presumed innocent until closer examination
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foo->stale = false;
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entrymap.entry_list[path] = MetaEntryPtr(foo);
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}
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}
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void HttpMetaCache::SaveEventually()
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{
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// reset the save timer
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saveBatchingTimer.stop();
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saveBatchingTimer.start(30000);
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}
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void HttpMetaCache::SaveNow()
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{
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if(m_index_file.isNull())
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return;
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QJsonObject toplevel;
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toplevel.insert("version", QJsonValue(QString("1")));
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QJsonArray entriesArr;
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for (auto group : m_entries)
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{
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for (auto entry : group.entry_list)
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{
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// do not save stale entries. they are dead.
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if(entry->stale)
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{
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continue;
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}
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QJsonObject entryObj;
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entryObj.insert("base", QJsonValue(entry->baseId));
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entryObj.insert("path", QJsonValue(entry->relativePath));
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entryObj.insert("md5sum", QJsonValue(entry->md5sum));
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entryObj.insert("etag", QJsonValue(entry->etag));
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entryObj.insert("last_changed_timestamp",
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QJsonValue(double(entry->local_changed_timestamp)));
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if (!entry->remote_changed_timestamp.isEmpty())
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entryObj.insert("remote_changed_timestamp",
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QJsonValue(entry->remote_changed_timestamp));
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entriesArr.append(entryObj);
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}
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}
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toplevel.insert("entries", entriesArr);
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QJsonDocument doc(toplevel);
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try
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{
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FS::write(m_index_file, doc.toJson());
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}
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catch (Exception & e)
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{
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qWarning() << e.what();
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}
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}
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