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/* Copyright 2013-2019 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.
*/
#pragma once
#include <QString>
#include <QMap>
#include <qtimer.h>
#include <memory>
#include "multimc_logic_export.h"
class HttpMetaCache;
class MULTIMC_LOGIC_EXPORT MetaEntry
{
friend class HttpMetaCache;
protected:
MetaEntry() {}
public:
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:
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;
};
typedef std::shared_ptr<MetaEntry> MetaEntryPtr;
class MULTIMC_LOGIC_EXPORT HttpMetaCache : public QObject
{
Q_OBJECT
public:
// supply path to the cache index file
HttpMetaCache(QString path = QString());
~HttpMetaCache();
// 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);
// 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());
// add a previously resolved stale entry
bool updateEntry(MetaEntryPtr stale_entry);
// evict selected entry from cache
bool evictEntry(MetaEntryPtr entry);
void addBase(QString base, QString base_root);
// (re)start a timer that calls SaveNow later.
void SaveEventually();
void Load();
QString getBasePath(QString base);
public
slots:
void SaveNow();
private:
// 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;
};
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