getLastTransaction method
Query the network to find the last transaction 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
Implementation
Future<Transaction> getLastTransaction(String address) async {
final Completer<Transaction> _completer = Completer<Transaction>();
TransactionLastResponse transactionLastResponse = TransactionLastResponse();
Transaction lastTransaction = new Transaction(
type: '', chainLength: 0, data: Transaction.initData(), address: '');
final Map<String, String> requestHeaders = {
'Content-type': 'application/json',
'Accept': 'application/json',
};
try {
final String _body =
'{"query": "query {lastTransaction(address: \\"$address\\") { ' +
Transaction.getQLFields() +
' } }"}';
logger.d('getTransactionIndex: requestHttp.body=' + _body);
final http.Response responseHttp = await http.post(
Uri.parse(endpoint! + '/api'),
body: _body,
headers: requestHeaders);
logger.d('getTransactionIndex: responseHttp.body=' + responseHttp.body);
if (responseHttp.statusCode == 200) {
transactionLastResponse =
transactionLastResponseFromJson(responseHttp.body);
if (transactionLastResponse.data != null &&
transactionLastResponse.data!.lastTransaction != null) {
lastTransaction = transactionLastResponse.data!.lastTransaction!;
}
}
} catch (e) {
logger.d('getTransactionIndex: error=' + e.toString());
}
_completer.complete(lastTransaction);
return _completer.future;
}