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Recover interrupted sync uploads after process restart

This commit is contained in:
bponders12-cell 2026-09-01 16:57:09 -04:00
parent 693f5f8aec
commit 48fa29aca2
1 changed files with 26 additions and 84 deletions
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110
lib/services/sync/sync_outbox.dart
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@ -3,133 +3,75 @@ import 'package:flutter/foundation.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'sync_models.dart';
/// Persistent, crash-resilient synchronization outbox outside Drift Schema 5.
class SyncOutbox {
static const String _outboxStorageKey = 'motorsignal_sync_outbox_manifest_v1';
static const int maxOutboxCapacity = 500;
final SharedPreferences _prefs;
final Map<String, SyncItem> _items = {};
Future<void> _saveChain = Future<void>.value();
bool _isLoaded = false;
SyncOutbox(this._prefs) {
load();
}
SyncOutbox(this._prefs) { load(); }
bool get isLoaded => _isLoaded;
int get count => _items.length;
void load() {
_items.clear();
final rawJson = _prefs.getString(_outboxStorageKey);
if (rawJson == null || rawJson.trim().isEmpty) {
_isLoaded = true;
return;
}
if (rawJson == null || rawJson.trim().isEmpty) { _isLoaded = true; return; }
try {
final decoded = jsonDecode(rawJson);
if (decoded is! List) throw const FormatException('Outbox manifest is not a list');
for (final entry in decoded) {
try {
final map = entry is Map<String, dynamic>
? entry
: Map<String, dynamic>.from(entry as Map);
final map = entry is Map<String, dynamic> ? entry : Map<String, dynamic>.from(entry as Map);
final item = SyncItem.fromJson(map);
_items[item.key] = item;
} catch (itemError) {
debugPrint('[SyncOutbox] Skipped malformed item: $itemError');
}
}
} catch (e) {
debugPrint('[SyncOutbox] Corrupt manifest recovered safely: $e');
_items.clear();
// An app/process death cannot leave an upload genuinely in progress.
// Requeue it so the provider can safely retry its deterministic operation.
_items[item.key] = item.status == SyncStatus.uploading
? item.copyWith(status: SyncStatus.queued, clearNextRetry: true)
: item;
} catch (itemError) { debugPrint('[SyncOutbox] Skipped malformed item: $itemError'); }
}
} catch (e) { debugPrint('[SyncOutbox] Corrupt manifest recovered safely: $e'); _items.clear(); }
_isLoaded = true;
}
Future<bool> _save() {
// Serialize writes so concurrent enqueue/update calls cannot overwrite
// one another with stale snapshots.
final operation = _saveChain.then((_) async {
if (_items.length > maxOutboxCapacity) {
final terminal = _items.values.where((i) => i.status.isTerminal).toList()
..sort((a, b) => a.createdAt.compareTo(b.createdAt));
while (_items.length > maxOutboxCapacity && terminal.isNotEmpty) {
final item = terminal.removeAt(0);
_items.remove(item.key);
final terminal = _items.values.where((i) => i.status.isTerminal).toList()..sort((a, b) => a.createdAt.compareTo(b.createdAt));
while (_items.length > maxOutboxCapacity && terminal.isNotEmpty) _items.remove(terminal.removeAt(0).key);
}
}
if (_items.length > maxOutboxCapacity) {
throw StateError('Sync outbox capacity reached with no evictable terminal items.');
}
return _prefs.setString(
_outboxStorageKey,
jsonEncode(_items.values.map((e) => e.toJson()).toList()),
);
if (_items.length > maxOutboxCapacity) throw StateError('Sync outbox capacity reached with no evictable terminal items.');
return _prefs.setString(_outboxStorageKey, jsonEncode(_items.values.map((e) => e.toJson()).toList()));
});
_saveChain = operation.then((_) {}, onError: (_) {});
return operation;
}
SyncItem? getItem(int localRideId, String providerId) => _items['$providerId:$localRideId'];
SyncItem? getItem(int localRideId, String providerId) => _items['${providerId.trim()}:$localRideId'];
List<SyncItem> getAllItems() => _items.values.toList(growable: false);
List<SyncItem> getPendingItems() => _items.values.where((i) => i.status.isPending).toList(growable: false);
List<SyncItem> getEligibleItems(DateTime now) => _items.values
.where((item) => item.isEligibleForAttempt(now))
.toList(growable: false);
List<SyncItem> getEligibleItems(DateTime now) => _items.values.where((i) => i.isEligibleForAttempt(now)).toList(growable: false);
Future<SyncItem> enqueue(int localRideId, String providerId, {DateTime? now}) async {
if (localRideId <= 0 || providerId.trim().isEmpty) {
throw ArgumentError('A positive localRideId and non-empty providerId are required.');
}
if (localRideId <= 0 || providerId.trim().isEmpty) throw ArgumentError('A positive localRideId and non-empty providerId are required.');
final normalizedProvider = providerId.trim();
final key = '$normalizedProvider:$localRideId';
final existing = _items[key];
if (existing != null) {
if (existing.status == SyncStatus.synced || existing.status == SyncStatus.queued || existing.status == SyncStatus.uploading) {
return existing;
if (existing.status == SyncStatus.synced || existing.status == SyncStatus.queued || existing.status == SyncStatus.uploading) return existing;
final rearmed = existing.copyWith(status: SyncStatus.queued, clearLastError: true, clearNextRetry: true);
_items[key] = rearmed; await _save(); return rearmed;
}
final rearmed = existing.copyWith(
status: SyncStatus.queued,
clearLastError: true,
clearNextRetry: true,
);
_items[key] = rearmed;
await _save();
return rearmed;
}
if (_items.length >= maxOutboxCapacity && !_items.values.any((i) => i.status.isTerminal)) {
throw StateError('Sync outbox capacity reached; pending rides were not discarded.');
}
final item = SyncItem(
localRideId: localRideId,
providerId: normalizedProvider,
status: SyncStatus.queued,
createdAt: now ?? DateTime.now(),
);
_items[key] = item;
await _save();
return item;
}
Future<void> update(SyncItem item) async {
_items[item.key] = item;
await _save();
}
Future<void> remove(int localRideId, String providerId) async {
if (_items.remove('$providerId:$localRideId') != null) await _save();
}
Future<void> clear() async {
_items.clear();
_saveChain = Future<void>.value();
await _prefs.remove(_outboxStorageKey);
if (_items.length >= maxOutboxCapacity && !_items.values.any((i) => i.status.isTerminal)) throw StateError('Sync outbox capacity reached; pending rides were not discarded.');
final item = SyncItem(localRideId: localRideId, providerId: normalizedProvider, status: SyncStatus.queued, createdAt: now ?? DateTime.now());
_items[key] = item; await _save(); return item;
}
Future<void> update(SyncItem item) async { _items[item.key] = item; await _save(); }
Future<void> remove(int localRideId, String providerId) async { if (_items.remove('${providerId.trim()}:$localRideId') != null) await _save(); }
Future<void> clear() async { _items.clear(); _saveChain = Future<void>.value(); await _prefs.remove(_outboxStorageKey); }
bool isRideSynced(int localRideId, String providerId) => getItem(localRideId, providerId)?.status == SyncStatus.synced;
}