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cache_manager.dart
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cache_manager.dart
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import 'dart:io';
import 'dart:typed_data';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_image/firebase_image.dart';
import 'package:firebase_image/src/firebase_image.dart';
import 'package:firebase_image/src/image_object.dart';
import 'package:firebase_storage/firebase_storage.dart';
import 'package:path/path.dart';
import 'package:path_provider/path_provider.dart';
import 'package:sqflite/sqflite.dart';
class FirebaseImageCacheManager {
static const String key = 'firebase_image';
late Database db;
static const String dbName = '$key.db';
static const String table = 'images';
late String basePath;
final CacheRefreshStrategy cacheRefreshStrategy;
FirebaseImageCacheManager(
this.cacheRefreshStrategy,
);
Future<void> open() async {
db = await openDatabase(
join((await getDatabasesPath())!, dbName),
onCreate: (Database db, int version) async {
await db.execute('''
CREATE TABLE $table (
uri TEXT PRIMARY KEY,
remotePath TEXT,
localPath TEXT,
bucket TEXT,
version INTEGER
)
''');
},
version: 1,
);
basePath = await _createFilePath();
}
Future<FirebaseImageObject> insert(FirebaseImageObject model) async {
await db.insert(table, model.toMap());
return model;
}
Future<FirebaseImageObject> update(FirebaseImageObject model) async {
await db.update(
table,
model.toMap(),
where: 'uri = ?',
whereArgs: [model.uri],
);
return model;
}
Future<FirebaseImageObject> upsert(FirebaseImageObject object) async {
if (await checkDatabaseForEntry(object)) {
return await update(object);
} else {
return await insert(object);
}
}
Future<bool> checkDatabaseForEntry(FirebaseImageObject object) async {
final List<Map<String, dynamic>> maps = await db.query(
table,
columns: const ['uri'],
where: 'uri = ?',
whereArgs: [object.uri],
);
return maps.length > 0;
}
Future<FirebaseImageObject?> get(String uri, FirebaseImage image) async {
final List<Map<String, dynamic>> maps = await db.query(
table,
columns: const [
'remotePath',
'localPath',
'bucket',
'version',
],
where: 'uri = ?',
whereArgs: [uri],
);
if (maps.length > 0) {
FirebaseImageObject returnObject =
FirebaseImageObject.fromMap(maps.first);
returnObject.reference = getImageRef(returnObject, image.firebaseApp);
if (CacheRefreshStrategy.BY_METADATA_DATE == this.cacheRefreshStrategy) {
checkForUpdate(returnObject, image); // Check for update in background
}
return returnObject;
}
return null;
}
Reference getImageRef(FirebaseImageObject object, FirebaseApp? firebaseApp) {
FirebaseStorage storage =
FirebaseStorage.instanceFor(app: firebaseApp, bucket: object.bucket);
return storage.ref().child(object.remotePath);
}
Future<void> checkForUpdate(
FirebaseImageObject object, FirebaseImage image) async {
int remoteVersion = (await object.reference.getMetadata())
.updated
?.millisecondsSinceEpoch ??
-1;
if (remoteVersion != object.version) {
// If true, download new image for next load
await this.upsertRemoteFileToCache(object, image.maxSizeBytes);
}
}
Future<List<FirebaseImageObject>> getAll() async {
final List<Map<String, dynamic>> maps = await db.query(table);
return List.generate(maps.length, (i) {
return FirebaseImageObject.fromMap(maps[i]);
});
}
Future<int> delete(String uri) async {
return await db.delete(
table,
where: 'uri = ?',
whereArgs: [uri],
);
}
Future<Uint8List?> localFileBytes(FirebaseImageObject? object) async {
if (await _fileExists(object)) {
return File(object!.localPath!).readAsBytes();
}
return null;
}
Future<Uint8List?> remoteFileBytes(
FirebaseImageObject object, int maxSizeBytes) {
return object.reference.getData(maxSizeBytes);
}
Future<Uint8List?> upsertRemoteFileToCache(
FirebaseImageObject object, int maxSizeBytes) async {
if (CacheRefreshStrategy.BY_METADATA_DATE == this.cacheRefreshStrategy) {
object.version = (await object.reference.getMetadata())
.updated
?.millisecondsSinceEpoch ??
0;
}
Uint8List? bytes = await remoteFileBytes(object, maxSizeBytes);
await putFile(object, bytes);
return bytes;
}
Future<FirebaseImageObject> putFile(
FirebaseImageObject object, final bytes) async {
String path = basePath + "/" + object.remotePath;
path = path.replaceAll("//", "/");
//print(join(basePath, object.remotePath)); Join isn't working?
final localFile = await File(path).create(recursive: true);
await localFile.writeAsBytes(bytes);
object.localPath = localFile.path;
return await upsert(object);
}
Future<bool> _fileExists(FirebaseImageObject? object) async {
if (object?.localPath == null) {
return false;
}
return File(object!.localPath!).exists();
}
Future<String> _createFilePath() async {
final directory = await getTemporaryDirectory();
return join(directory.path, key);
}
Future<void> close() => db.close();
}