stack_wallet/lib/services/litescribe_api.dart
2023-07-20 14:53:15 -05:00

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2.6 KiB
Dart

import 'dart:convert';
import 'package:http/http.dart' as http;
import 'package:stackwallet/dto/ordinals/address_inscription_response.dart';
import 'package:stackwallet/dto/ordinals/litescribe_response.dart';
class LitescribeAPI {
static final LitescribeAPI _instance = LitescribeAPI._internal();
factory LitescribeAPI({required String baseUrl}) {
_instance.baseUrl = baseUrl;
return _instance;
}
LitescribeAPI._internal();
late String baseUrl;
Future<LitescribeResponse> _getResponse(String endpoint) async {
final response = await http.get(Uri.parse('$baseUrl$endpoint'));
if (response.statusCode == 200) {
return LitescribeResponse(data: _validateJson(response.body));
} else {
throw Exception('LitescribeAPI _getResponse exception: Failed to load data');
}
}
Map<String, dynamic> _validateJson(String responseBody) {
final parsed = jsonDecode(responseBody);
if (parsed is Map<String, dynamic>) {
return parsed;
} else {
throw const FormatException('LitescribeAPI _validateJson exception: Invalid JSON format');
}
}
Future<AddressInscriptionResponse> getInscriptionsByAddress(String address, {int cursor = 0, int size = 1000}) async {
// size param determines how many inscriptions are returned per response
// default of 1000 is used to cover most addresses (I assume)
// if the total number of inscriptions at the address exceeds the length of the list of inscriptions returned, another call with a higher size is made
final int defaultLimit = 1000;
final response = await _getResponse('/address/inscriptions?address=$address&cursor=$cursor&size=$size');
// Check if the number of returned inscriptions equals the limit
final list = response.data['result']['list'] as List<dynamic>;
final int total = response.data['result']['total'] as int;
final int currentSize = list.length;
if (currentSize == size && currentSize < total) {
// If the number of returned inscriptions equals the limit and there are more inscriptions available,
// increment the cursor and make the next API call to fetch the remaining inscriptions.
final int newCursor = cursor + size;
return getInscriptionsByAddress(address, cursor: newCursor, size: size);
// TODO test logic with smaller size "pagination"
} else {
try {
return AddressInscriptionResponse.fromJson(response.data as Map<String, dynamic>);
} catch (e) {
throw const FormatException('LitescribeAPI getInscriptionsByAddress exception: AddressInscriptionResponse.fromJson failure');
}
}
}
}