0a49323858
Turns the orders table into a queue that empties itself. Bills were only uploaded when a cashier pressed Sync at end of day; a till that was never pressed held a day's takings indefinitely. Drain engine (lib/data/sync/sync_engine.dart) - Triggers on sale committed, network regained, 5-minute poll, head-office request, and the manual button. - Single flight: a busy till firing a trigger per sale would otherwise have several passes reading the same pending rows and send every bill twice. A trigger arriving mid-drain is queued and replayed, so nothing is dropped. - Exponential backoff with +/-20% jitter to a 5-minute ceiling. The jitter matters: a store's terminals all fail at the same instant when the line drops, and would retry in lockstep without it. - Halts rather than loops on a failure retrying cannot fix (bad credential, refused batch). Pressing Sync clears the halt. Transports (lib/data/remote/) - OrderTransport interface; MQTT, HTTP and simulated implementations. The repository does not know which is in use. - MQTT: QoS 1 uplink, application-level ACK correlated by batch_id on a return topic, retained Last Will for terminal-offline detection, downlink for catalogue pushes and remote sync requests. - A broker PUBACK is never treated as acceptance. It means the broker holds the bytes, not that the ledger took the sale. Only ids the back office names are marked synced; silence leaves a bill pending. - HTTP carries a stable idempotency key across retries of the same bills. Retention - Accepted bills are kept 7 days instead of deleted, so a batch the back office later loses can be re-sent in full. Purged after that; archived totals stay forever. - forBusinessDate now reads pending rows only. A retained bill exists in both the orders table and day_archive, and summing both would overstate the day. Fixes found while building this - SyncEngine._refreshPending wrote state.copyWith(pending: await ...). Dart evaluates the receiver before the awaited argument, so a connectivity drop during the wait was silently overwritten by the stale snapshot. Caught by the first run of the new engine tests. - PrinterSettingsController wrote state after four awaits with no mounted check, throwing "used after dispose" when Settings was left mid-load. This was pre-existing and reached the cashier as a red screen. Also - Header pill now reports real sync state: LIVE / n QUEUED / SYNCING / SYNC HALTED, with an explanation of where the bills are. - Settings shows the route, last upload, next retry and retention window. - docs/sync-contract.md states what the back office must implement, including the idempotency requirement that at-least-once delivery makes mandatory. Tests: 90 -> 129 passing. New coverage for backoff shape and jitter band, single flight, halting, ACK correlation and partial acceptance, at-least-once duplicate handling, retention and purge, and no double-counting after a sync. Suite run six times clean. Not addressed: bills already synced by an older build went up overstated and still need server-side reconciliation. Broker credentials have no Settings editor yet. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
33 lines
1.1 KiB
Dart
33 lines
1.1 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../core/constants/app_constants.dart';
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import '../core/router/app_router.dart';
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import '../core/theme/app_theme.dart';
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import '../presentation/sync/providers/sync_controller.dart';
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class NearlePosApp extends ConsumerWidget {
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const NearlePosApp({super.key});
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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// Watched, not awaited: the till opens immediately and the queue drains
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// behind it. Nothing on screen depends on this having finished.
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ref.watch(syncBootstrapProvider);
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return MaterialApp.router(
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title: AppConstants.appName,
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debugShowCheckedModeBanner: false,
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theme: AppTheme.light,
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routerConfig: ref.watch(routerProvider),
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builder: (context, child) {
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// A POS runs on fixed hardware; ignore OS font scaling so the dense
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// billing panel can never overflow.
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return MediaQuery.withNoTextScaling(
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child: child ?? const SizedBox.shrink(),
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);
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},
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);
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}
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}
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