MultiMC5/launcher/net/HttpMetaCache.h

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/* Copyright 2013-2021 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.
*/
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#pragma once
#include <QString>
#include <QMap>
#include <qtimer.h>
#include <memory>
class HttpMetaCache;
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class MetaEntry
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{
friend class HttpMetaCache;
protected:
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MetaEntry() {}
public:
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bool isStale()
{
return stale;
}
void setStale(bool stale)
{
this->stale = stale;
}
QString getFullPath();
QString getRemoteChangedTimestamp()
{
return remote_changed_timestamp;
}
void setRemoteChangedTimestamp(QString remote_changed_timestamp)
{
this->remote_changed_timestamp = remote_changed_timestamp;
}
void setLocalChangedTimestamp(qint64 timestamp)
{
local_changed_timestamp = timestamp;
}
QString getETag()
{
return etag;
}
void setETag(QString etag)
{
this->etag = etag;
}
QString getMD5Sum()
{
return md5sum;
}
void setMD5Sum(QString md5sum)
{
this->md5sum = md5sum;
}
protected:
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QString baseId;
QString basePath;
QString relativePath;
QString md5sum;
QString etag;
qint64 local_changed_timestamp = 0;
QString remote_changed_timestamp; // QString for now, RFC 2822 encoded time
bool stale = true;
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};
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typedef std::shared_ptr<MetaEntry> MetaEntryPtr;
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class HttpMetaCache : public QObject
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{
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Q_OBJECT
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public:
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// supply path to the cache index file
HttpMetaCache(QString path = QString());
~HttpMetaCache();
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// get the entry solely from the cache
// you probably don't want this, unless you have some specific caching needs.
MetaEntryPtr getEntry(QString base, QString resource_path);
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// get the entry from cache and verify that it isn't stale (within reason)
MetaEntryPtr resolveEntry(QString base, QString resource_path,
QString expected_etag = QString());
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// add a previously resolved stale entry
bool updateEntry(MetaEntryPtr stale_entry);
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// evict selected entry from cache
bool evictEntry(MetaEntryPtr entry);
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void addBase(QString base, QString base_root);
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// (re)start a timer that calls SaveNow later.
void SaveEventually();
void Load();
QString getBasePath(QString base);
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public
slots:
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void SaveNow();
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private:
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// create a new stale entry, given the parameters
MetaEntryPtr staleEntry(QString base, QString resource_path);
struct EntryMap
{
QString base_path;
QMap<QString, MetaEntryPtr> entry_list;
};
QMap<QString, EntryMap> m_entries;
QString m_index_file;
QTimer saveBatchingTimer;
};