NOISSUE Flatten gui and logic libraries into MultiMC

launcher/net/HttpMetaCache.h

@@ -0,0 +1,123 @@
+/* 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.
+ */
+
+#pragma once
+#include <QString>
+#include <QMap>
+#include <qtimer.h>
+#include <memory>
+
+class HttpMetaCache;
+
+class 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 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;
+};