feat: Basic implementation of the OfflineSyncCrdt methods on SQLite3

2026-01-23 01:21:10 -03:00 · 2026-01-23 01:21:10 -03:00 · f078e66a51
commit f078e66a51
parent f74f94edea
1 changed files with 927 additions and 100 deletions
--- a/test/crdt/crdt_merge_changeset_test.dart
+++ b/test/crdt/crdt_merge_changeset_test.dart
@ -0,0 +1,126 @@
+import 'package:drift/drift.dart' hide isNotNull, isNull;
+import 'package:drift_offline_first/drift_offline_first.dart';
+import 'package:test/test.dart';
+
+import '../utils/crdt_context.dart';
+import '../utils/database.dart';
+import '../utils/tables.dart';
+
+void main() {
+  late OfflineSyncCrdt crdt;
+  late CrdtDatabase crdtDb;
+  late String nodeId;
+
+  group('Given CRDT for an empty database and a pending changeset', () {
+    late Iterable<CrdtDataEntry> changeset;
+
+    setUp(() async {
+      (crdt, crdtDb, nodeId) = database.crdtContext;
+
+      final todo = TodoEntry(
+        id: const RowId(1),
+        content: 'test',
+        targetDate: DateTime.now(),
+      );
+
+      changeset = todo.toCrdtDataEntry(nodeId);
+    });
+
+    test(
+        'when merging a changeset '
+        'then the changeset is saved to the database.', () async {
+      await crdt.merge(changeset);
+
+      expect(await crdtDb.managers.crdtDataTable.get(), changeset);
+    });
+  });
+
+  group(
+      'Given CRDT for a database with data and a pending changeset with conflicting data and older HLC',
+      () {
+    late Iterable<CrdtDataEntry> firstChangeset;
+    late Iterable<CrdtDataEntry> lateOldChangeset;
+
+    setUp(() async {
+      (crdt, crdtDb, nodeId) = database.crdtContext;
+
+      final todo = TodoEntry(
+        id: const RowId(1),
+        content: 'test',
+        targetDate: DateTime.now(),
+      );
+
+      firstChangeset = todo.toCrdtDataEntry(nodeId);
+      await crdt.merge(firstChangeset);
+
+      lateOldChangeset = todo.toCrdtDataEntry(nodeId, hlc: Hlc.zero(nodeId));
+    });
+
+    test(
+        'when merging a changeset with older HLC '
+        'then no changes are saved to the database.', () async {
+      await crdt.merge(lateOldChangeset);
+
+      expect(await crdtDb.managers.crdtDataTable.get(), firstChangeset);
+    });
+  });
+
+  group(
+      'Given CRDT for a database with data and a pending changeset with conflicting data and some entries with newer HLC',
+      () {
+    late Iterable<CrdtDataEntry> firstChangeset;
+    late Iterable<CrdtDataEntry> newerChangeset;
+
+    setUp(() async {
+      (crdt, crdtDb, nodeId) = database.crdtContext;
+
+      final todo = TodoEntry(
+        id: const RowId(1),
+        content: 'test',
+        targetDate: DateTime.now(),
+      );
+
+      firstChangeset = todo.toCrdtDataEntry(nodeId);
+      await crdt.merge(firstChangeset);
+
+      newerChangeset =
+          todo.toCrdtDataEntry(nodeId).where((e) => e.columnName == 'content');
+    });
+
+    test(
+        'when merging a changeset with some entries with newer HLC '
+        'then the entries with newer HLC are saved to the database.', () async {
+      await crdt.merge(newerChangeset);
+
+      final expectedResultingChangeset = [
+        for (final e in firstChangeset)
+          if (e.columnName == 'content') newerChangeset.first else e,
+      ];
+
+      expect(await crdtDb.managers.crdtDataTable.get(), expectedResultingChangeset);
+    });
+  });
+}
+
+extension on TodoEntry {
+  Iterable<CrdtDataEntry> toCrdtDataEntry(String nodeId, {Hlc? hlc}) {
+    final hlcTimestamp = hlc ?? Hlc.now(nodeId);
+
+    return database.todosTable.$columns.map(
+      (c) => CrdtDataEntry(
+        userId: 'test',
+        tblName: 'todos',
+        columnName: c.$name,
+        rowId: id.toString(),
+        rawValue: (toJson()[c.$name] as Object?)?.toDriftAny(),
+        hlcTimestamp: hlcTimestamp,
+      ),
+    );
+  }
+}
+
+extension on Object {
+  DriftAny? toDriftAny() {
+    return DriftAny(this);
+  }
+}