63 lines
1.8 KiB
Dart
63 lines
1.8 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:localstore/localstore.dart';
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import 'apiResponse.dart';
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abstract class RequestCache<T extends ApiResponse?> {
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static const int cacheNothing = 0;
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static const int cacheMinute = 60;
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static const int cacheHour = 60 * 60;
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static const int cacheDay = 60 * 60 * 24;
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static String collection = 'MarianumMobile';
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int maxCacheTime;
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void Function(T)? onUpdate;
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void Function(Exception) onError;
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bool? renew;
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final Completer<void> _ready = Completer<void>();
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/// Resolves when [start] has finished, regardless of whether the network
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/// call succeeded, failed, or was skipped due to a fresh cache. Callers
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/// can await this to know when both the cache lookup and the network
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/// attempt have settled.
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Future<void> get ready => _ready.future;
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RequestCache(this.maxCacheTime, this.onUpdate, {this.onError = ignore, this.renew = false});
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static void ignore(Exception e) {}
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Future<void> start(String document) async {
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try {
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final tableData = await Localstore.instance.collection(collection).doc(document).get();
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if (tableData != null) {
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onUpdate?.call(onLocalData(tableData['json']));
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}
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if (DateTime.now().millisecondsSinceEpoch - (maxCacheTime * 1000) < (tableData?['lastupdate'] ?? 0)) {
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if (renew == null || !renew!) return;
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}
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try {
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final newValue = await onLoad();
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onUpdate?.call(newValue);
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Localstore.instance.collection(collection).doc(document).set({
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'json': jsonEncode(newValue),
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'lastupdate': DateTime.now().millisecondsSinceEpoch,
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});
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} on Exception catch (e) {
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onError(e);
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}
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} finally {
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if (!_ready.isCompleted) _ready.complete();
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}
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}
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T onLocalData(String json);
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Future<T> onLoad();
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}
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