fetchBalance method
Query the network to find a balance from an address @param {String} The address scalar type represents a cryptographic hash used in the ArchEthic network with an identification byte to specify from which algorithm the hash was generated. The Hash appears in a JSON response as Base16 formatted string. The parsed hash will be converted to a binary and any invalid hash with an invalid algorithm or invalid size will be rejected Returns Balance represents a ledger balance. It includes: UCO: uco balance & NFT: NFT balances
Implementation
Future<Balance> fetchBalance(String address) async {
final Completer<Balance> _completer = Completer<Balance>();
BalanceResponse? balanceResponse;
Balance balance = Balance();
final Map<String, String> requestHeaders = {
'Content-type': 'application/json',
'Accept': 'application/json',
};
final String _body =
'{"query": "query {balance(address: \\"$address\\") {uco, nft {address, amount}}}"}';
logger.d('fetchBalance: requestHttp.body=' + _body);
try {
final http.Response responseHttp = await http.post(
Uri.parse(endpoint! + '/api'),
body: _body,
headers: requestHeaders);
logger.d('fetchBalance: responseHttp.body=' + responseHttp.body);
if (responseHttp.statusCode == 200) {
balanceResponse = balanceResponseFromJson(responseHttp.body);
if (balanceResponse.data != null) {
balance = balanceResponse.data!.balance!;
}
}
} catch (e) {
logger.d('fetchBalance: error=' + e.toString());
}
_completer.complete(balance);
return _completer.future;
}