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Merge pull request #17 from TBD54566975/dyanmic_pfis
load PFIs from known source and cache as shared preference
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,22 +1,88 @@ | ||
| import 'dart:convert'; | ||
| import 'package:flutter/foundation.dart'; | ||
| import 'package:flutter_starter/features/pfis/pfi.dart'; | ||
| import 'package:hooks_riverpod/hooks_riverpod.dart'; | ||
| import 'package:http/http.dart' as http; | ||
| import 'package:shared_preferences/shared_preferences.dart'; | ||
|
|
||
| final pfisProvider = Provider<List<Pfi>>( | ||
| (ref) => [ | ||
| Pfi( | ||
| id: 'prototype', | ||
| name: 'Prototype', | ||
| didUri: 'did:dht:74hg1efatndi8enx3e4z6c4u8ieh1xfkyay4ntg4dg1w6risu35y', | ||
| ), | ||
| Pfi( | ||
| id: 'africa', | ||
| name: 'Africa', | ||
| didUri: 'coming soon...', | ||
| ), | ||
| Pfi( | ||
| id: 'mexico', | ||
| name: 'Mexico', | ||
| didUri: 'coming soon...', | ||
| ), | ||
| ], | ||
| ); | ||
| final pfisProvider = FutureProvider<List<Pfi>>((ref) async { | ||
| const url = 'https://raw.githubusercontent.com/TBD54566975/pfi-providers-data/main/pfis.json'; | ||
| const cacheKey = 'pfi_cache'; | ||
|
|
||
|
|
||
| // fall back to a dev PFI if passed on command line like: flutter run --dart-define=DEV_PFI=your_did_string | ||
| const devPfi = String.fromEnvironment('DEV_PFI'); | ||
| if (devPfi != '' && devPfi != null) { | ||
| return [ | ||
| Pfi( | ||
| id: 'dev', | ||
| name: 'Dev PFI', | ||
| didUri: devPfi, | ||
| ), | ||
| ]; | ||
| } | ||
|
|
||
| // First, try loading from cache | ||
| List<Pfi> pfis = await _loadFromCache(cacheKey); | ||
| if (pfis.isNotEmpty) { | ||
| // If cache has data, return it first | ||
| // Then, asynchronously refresh the cache | ||
| _refreshCache(url, cacheKey); | ||
| return pfis; | ||
| } else { | ||
| // If cache is empty, fetch from the URL | ||
| return await _fetchFromURL(url, cacheKey); | ||
| } | ||
| }); | ||
|
|
||
| Future<List<Pfi>> _loadFromCache(String cacheKey) async { | ||
| final prefs = await SharedPreferences.getInstance(); | ||
| String? cachedData = prefs.getString(cacheKey); | ||
|
|
||
| if (cachedData != null) { | ||
| return (json.decode(cachedData) as List).map((data) { | ||
| return Pfi( | ||
| id: data['id'] as String, | ||
| name: data['name'] as String, | ||
| didUri: data['didUri'] as String, | ||
| ); | ||
| }).toList(); | ||
| } else { | ||
| return []; | ||
| } | ||
| } | ||
|
|
||
| Future<List<Pfi>> _fetchFromURL(String url, String cacheKey) async { | ||
| try { | ||
| final response = await http.get(Uri.parse(url)); | ||
| if (response.statusCode == 200) { | ||
| final prefs = await SharedPreferences.getInstance(); | ||
| await prefs.setString(cacheKey, response.body); | ||
|
|
||
| return (json.decode(response.body) as List).map((data) { | ||
| return Pfi( | ||
| id: data['id'] as String, | ||
| name: data['name'] as String, | ||
| didUri: data['didUri'] as String, | ||
| ); | ||
| }).toList(); | ||
| } | ||
| } catch (e) { | ||
| // Handle the error or return an empty list | ||
| debugPrint(e.toString()); | ||
| } | ||
| return []; | ||
| } | ||
|
|
||
| Future<void> _refreshCache(String url, String cacheKey) async { | ||
| try { | ||
| final response = await http.get(Uri.parse(url)); | ||
| if (response.statusCode == 200) { | ||
| final prefs = await SharedPreferences.getInstance(); | ||
| await prefs.setString(cacheKey, response.body); | ||
| } | ||
| } catch (e) { | ||
| // Handle the error silently as this is a background refresh | ||
| debugPrint(e.toString()); | ||
| } | ||
| } |
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