78 lines
2.6 KiB
Dart
78 lines
2.6 KiB
Dart
import 'dart:io';
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import 'dart:isolate';
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import 'package:famedlysdk/famedlysdk.dart';
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import 'package:sqflite/sqflite.dart' show getDatabasesPath;
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import 'package:path/path.dart' as p;
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import 'package:flutter/material.dart';
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import 'package:moor/moor.dart';
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import 'package:moor/isolate.dart';
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import 'cipher_db.dart' as cipher;
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class DatabaseNoTransactions extends Database {
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DatabaseNoTransactions.connect(DatabaseConnection connection)
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: super.connect(connection);
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// moor transactions are sometimes rather weird and freeze. Until there is a
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// proper fix in moor we override that there aren't actually using transactions
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@override
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Future<T> transaction<T>(Future<T> Function() action) async {
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return action();
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}
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}
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bool _inited = false;
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// see https://moor.simonbinder.eu/docs/advanced-features/isolates/
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void _startBackground(_IsolateStartRequest request) {
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// this is the entry point from the background isolate! Let's create
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// the database from the path we received
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if (!_inited) {
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cipher.init();
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_inited = true;
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}
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final executor = cipher.VmDatabaseEncrypted(File(request.targetPath),
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password: request.password, logStatements: request.logStatements);
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// we're using MoorIsolate.inCurrent here as this method already runs on a
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// background isolate. If we used MoorIsolate.spawn, a third isolate would be
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// started which is not what we want!
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final moorIsolate = MoorIsolate.inCurrent(
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() => DatabaseConnection.fromExecutor(executor),
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);
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// inform the starting isolate about this, so that it can call .connect()
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request.sendMoorIsolate.send(moorIsolate);
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}
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// used to bundle the SendPort and the target path, since isolate entry point
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// functions can only take one parameter.
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class _IsolateStartRequest {
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final SendPort sendMoorIsolate;
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final String targetPath;
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final String password;
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final bool logStatements;
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_IsolateStartRequest(
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this.sendMoorIsolate, this.targetPath, this.password, this.logStatements);
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}
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Future<Database> constructDb(
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{bool logStatements = false,
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String filename = 'database.sqlite',
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String password = ''}) async {
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debugPrint('[Moor] using encrypted moor');
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final dbFolder = await getDatabasesPath();
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final targetPath = p.join(dbFolder, filename);
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final receivePort = ReceivePort();
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await Isolate.spawn(
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_startBackground,
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_IsolateStartRequest(
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receivePort.sendPort, targetPath, password, logStatements),
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);
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final isolate = (await receivePort.first as MoorIsolate);
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return DatabaseNoTransactions.connect(await isolate.connect());
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}
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Future<String> getLocalstorage(String key) async {
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return null;
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}
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