check when op_low_reserve error (#159)

* check when op_low_reserve error

* include cancel, update orders

* use ? instead of !

* implement error check type

Author: AlaaElattar

packages/stellar_client/lib/models/exceptions.dart

@@ -0,0 +1,36 @@
+class StellarBalanceException implements Exception {
+  final String message;
+  final String? resultXdr;
+  final bool isLowReserve;
+
+  StellarBalanceException({
+    required this.message,
+    this.resultXdr,
+    this.isLowReserve = false,
+  });
+
+  @override
+  String toString() {
+    if (resultXdr != null) {
+      return 'StellarBalanceException: $message (XDR: $resultXdr)';
+    }
+    return 'StellarBalanceException: $message';
+  }
+
+  static StellarBalanceException fromOperationResult(
+    List<String?>? operationCodes,
+    String? resultXdr,
+  ) {
+    if (operationCodes?.contains('op_low_reserve') == true) {
+      return StellarBalanceException(
+        message: 'Transaction failed due to low reserve',
+        resultXdr: resultXdr,
+        isLowReserve: true,
+      );
+    }
+    return StellarBalanceException(
+      message: 'Transaction failed',
+      resultXdr: resultXdr,
+    );
+  }
+}

packages/stellar_client/lib/src/client.dart

@@ -667,10 +667,15 @@ class Client {
       final SubmitTransactionResponse response =
           await _sdk.submitTransaction(transaction);
       if (!response.success) {
-        logger.e('Transaction failed with result: ${response.resultXdr}');
-        return false;
+        throw StellarBalanceException.fromOperationResult(
+          response.extras?.resultCodes?.operationsResultCodes,
+          response.resultXdr,
+        );
       }
+
       return true;
+    } on StellarBalanceException catch (_) {
+      rethrow;
     } catch (error) {
       throw Exception('Transaction failed due to: ${error.toString()}');
     }
@@ -706,10 +711,14 @@ class Client {
       final SubmitTransactionResponse response =
           await _sdk.submitTransaction(transaction);
       if (!response.success) {
-        logger.e('Transaction failed with result: ${response.resultXdr}');
-        return false;
+        throw StellarBalanceException.fromOperationResult(
+          response.extras?.resultCodes?.operationsResultCodes,
+          response.resultXdr,
+        );
       }
       return true;
+    } on StellarBalanceException catch (_) {
+      rethrow;
     } catch (error) {
       throw Exception('Transaction failed due to: ${error.toString()}');
     }
@@ -755,10 +764,14 @@ class Client {
       final SubmitTransactionResponse response =
           await _sdk.submitTransaction(transaction);
       if (!response.success) {
-        logger.e('Transaction failed with result: ${response.resultXdr}');
-        return false;
+        throw StellarBalanceException.fromOperationResult(
+          response.extras?.resultCodes?.operationsResultCodes,
+          response.resultXdr,
+        );
       }
       return true;
+    } on StellarBalanceException catch (_) {
+      rethrow;
     } catch (error) {
       throw Exception('Transaction failed due to: ${error.toString()}');
     }

packages/stellar_client/lib/stellar_client.dart

@@ -5,6 +5,7 @@ import 'dart:typed_data';
 
 import 'package:stellar_client/models/balance.dart';
 import 'package:stellar_client/models/currency.dart' as currency;
+import 'package:stellar_client/models/exceptions.dart';
 import 'package:stellar_client/models/transaction_data.dart';
 import 'package:stellar_client/models/vesting_account.dart';
 import 'package:stellar_client/models/transaction.dart';