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fullenifulleni
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feat(countries): use HtCountriesInMemoryClient for countries data
- Replace the InMemoryHtCountriesClient with HtCountriesInMemoryClient - Update the countriesClientProvider to use the new client - Add ht_countries_inmemory package to dependencies
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‎lib/src/providers/countries_client_provider.dart

Lines changed: 15 additions & 155 deletions
Original file line numberDiff line numberDiff line change
@@ -1,163 +1,23 @@
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import 'package:dart_frog/dart_frog.dart';
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import 'package:ht_countries_client/ht_countries_client.dart';
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import 'package:meta/meta.dart'; // For @visibleForTesting
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import 'package:ht_countries_inmemory/ht_countries_inmemory.dart';
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/// Provides an instance of [HtCountriesClient] to the request context.
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///
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/// This middleware is responsible for creating or obtaining the client instance
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/// (e.g., based on environment variables or configuration) and making it
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/// available via `context.read<HtCountriesClient>()` in subsequent handlers
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/// and middleware.
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/// This middleware uses the inmemory implementation
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/// [HtCountriesInMemoryClient].
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Middleware countriesClientProvider() {
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return provider<HtCountriesClient>(
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(context) {
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// TODO(fulleni): Replace this with your actual HtCountriesClient
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// implementation.
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//
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// This could involve reading configuration, setting up database
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// connections, or initializing an HTTP client depending on your
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// chosen backend.
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//
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// Example:
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// final firestore = Firestore.instance; // If using Firestore
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// return FirestoreHtCountriesClient(firestore);
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//
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// final dio = Dio(); // If using an HTTP API
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// return ApiHtCountriesClient(dio);
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// For development/testing purposes, we provide an in-memory mock.
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// DO NOT use this in production.
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print(
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'WARNING: Using InMemoryHtCountriesClient. Replace for production!',
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);
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return InMemoryHtCountriesClient();
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},
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);
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}
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/// {@template in_memory_ht_countries_client}
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/// A simple in-memory implementation of [HtCountriesClient] for testing
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/// and development purposes.
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///
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/// **Do not use this in production.**
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/// {@endtemplate}
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@visibleForTesting
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class InMemoryHtCountriesClient implements HtCountriesClient {
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/// {@macro in_memory_ht_countries_client}
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InMemoryHtCountriesClient() {
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// Initialize with some sample data
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_countries = {
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'US': Country(
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isoCode: 'US',
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name: 'United States',
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flagUrl: 'https://example.com/flags/us.png',
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),
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'CA': Country(
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isoCode: 'CA',
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name: 'Canada',
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flagUrl: 'https://example.com/flags/ca.png',
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),
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'GB': Country(
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isoCode: 'GB',
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name: 'United Kingdom',
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flagUrl: 'https://example.com/flags/gb.png',
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),
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'DZ': Country(
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isoCode: 'DZ',
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name: 'Algeria',
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flagUrl: 'https://example.com/flags/dz.png',
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),
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// Create the client instance once when the middleware is initialized.
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// This assumes the in-memory client is cheap to create and can be reused
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// across requests.
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final HtCountriesClient client = HtCountriesInMemoryClient();
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return (Handler innerHandler) {
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return (RequestContext context) {
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// Provide the existing client instance to this request's context.
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final updatedContext = context.provide<HtCountriesClient>(() => client);
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// Call the next handler in the chain with the updated context.
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return innerHandler(updatedContext);
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};
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}
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/// Internal storage for countries, mapping ISO code to Country object.
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late final Map<String, Country> _countries;
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@override
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Future<List<Country>> fetchCountries({
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required int limit,
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String? startAfterId,
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}) async {
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await _simulateDelay();
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final countryList = _countries.values.toList()
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..sort((a, b) => a.isoCode.compareTo(b.isoCode)); // Consistent order
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var startIndex = 0;
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if (startAfterId != null) {
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final startAfterCountry = _countries.values.firstWhere(
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(c) => c.id == startAfterId,
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orElse: () => throw const CountryNotFound('StartAfterId not found'),
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);
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final index = countryList.indexWhere((c) => c.id == startAfterCountry.id);
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if (index != -1) {
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startIndex = index + 1;
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} else {
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// Should not happen if startAfterId was valid, but handle defensively
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throw const CountryNotFound('StartAfterId inconsistency');
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}
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}
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if (startIndex >= countryList.length) {
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return []; // No more items after the specified ID
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}
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final endIndex = (startIndex + limit).clamp(0, countryList.length);
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return countryList.sublist(startIndex, endIndex);
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}
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@override
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Future<Country> fetchCountry(String isoCode) async {
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await _simulateDelay();
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final country = _countries[isoCode.toUpperCase()];
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if (country == null) {
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throw CountryNotFound('Country with ISO code $isoCode not found.');
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}
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return country;
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}
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@override
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Future<void> createCountry(Country country) async {
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await _simulateDelay();
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final upperIsoCode = country.isoCode.toUpperCase();
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if (_countries.containsKey(upperIsoCode)) {
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throw CountryCreateFailure(
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'Country with ISO code $upperIsoCode already exists.',
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);
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}
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// Ensure ID is generated if not provided (though constructor handles this)
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final countryWithId = Country(
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id: country.id, // Use existing or generate new
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isoCode: upperIsoCode,
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name: country.name,
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flagUrl: country.flagUrl,
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);
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_countries[upperIsoCode] = countryWithId;
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}
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@override
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Future<void> updateCountry(Country country) async {
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await _simulateDelay();
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final upperIsoCode = country.isoCode.toUpperCase();
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if (!_countries.containsKey(upperIsoCode)) {
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throw CountryNotFound('Country with ISO code $upperIsoCode not found.');
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}
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// Update using the provided country data, keeping the original ID if needed
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// or ensuring the provided one is used consistently.
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_countries[upperIsoCode] = country;
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}
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@override
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Future<void> deleteCountry(String isoCode) async {
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await _simulateDelay();
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final upperIsoCode = isoCode.toUpperCase();
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if (!_countries.containsKey(upperIsoCode)) {
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throw CountryNotFound('Country with ISO code $upperIsoCode not found.');
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}
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_countries.remove(upperIsoCode);
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}
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/// Helper to simulate network latency.
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Future<void> _simulateDelay() async {
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await Future<void>.delayed(const Duration(milliseconds: 50));
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}
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};
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}

‎pubspec.yaml

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Original file line numberDiff line numberDiff line change
@@ -11,6 +11,9 @@ dependencies:
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ht_countries_client:
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git:
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url: https://github.com/headlines-toolkit/ht-countries-client.git
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ht_countries_inmemory:
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git:
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url: https://github.com/headlines-toolkit/ht-countries-inmemory.git
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meta: ^1.16.0
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uuid: ^4.5.1
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