Support DEX orders on stellar client

packages/stellar_client/lib/src/client.dart

@@ -6,6 +6,7 @@ class Client {
   late KeyPair _keyPair;
   late currency.Currencies _currencies;
   late Map<String, String> _serviceUrls;
+  late Map<String, String> _horizonServerUrls;
   late Network _stellarNetwork;
 
   String get accountId => _keyPair.accountId;
@@ -49,10 +50,16 @@ class Client {
 
   void _initialize() {
     late final currency.Currency tft;
+    late final currency.Currency usdc;
     _serviceUrls = {
       'PUBLIC': 'https://tokenservices.threefold.io/threefoldfoundation',
       'TESTNET': 'https://testnet.threefold.io/threefoldfoundation'
     };
+    _horizonServerUrls = {
+      'PUBLIC': 'https://horizon.stellar.org/',
+      'TESTNET': 'https://horizon-testnet.stellar.org/'
+    };
+
     switch (_network) {
       case NetworkType.TESTNET:
         _sdk = StellarSDK.TESTNET;
@@ -61,6 +68,9 @@ class Client {
           assetCode: 'TFT',
           issuer: "GA47YZA3PKFUZMPLQ3B5F2E3CJIB57TGGU7SPCQT2WAEYKN766PWIMB3",
         );
+        usdc = currency.Currency(
+            assetCode: 'USDC',
+            issuer: 'GBBD47IF6LWK7P7MDEVSCWR7DPUWV3NY3DTQEVFL4NAT4AQH3ZLLFLA5');
         break;
       case NetworkType.PUBLIC:
         _sdk = StellarSDK.PUBLIC;
@@ -69,10 +79,17 @@ class Client {
           assetCode: 'TFT',
           issuer: "GBOVQKJYHXRR3DX6NOX2RRYFRCUMSADGDESTDNBDS6CDVLGVESRTAC47",
         );
+        usdc = currency.Currency(
+            assetCode: 'USDC',
+            issuer: 'GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN');
         break;
     }
 
-    _currencies = currency.Currencies({'TFT': tft});
+    _currencies = currency.Currencies({
+      'TFT': tft,
+      'USDC': usdc,
+      'XLM': currency.Currency(assetCode: 'XLM', issuer: "")
+    });
   }
 
   Future<bool> activateThroughThreefoldService() async {
@@ -131,9 +148,17 @@ class Client {
   }
 
   Future<bool> addTrustLine() async {
+    bool allTrustlinesAdded = true;
+
     for (var entry in _currencies.currencies.entries) {
       String currencyCode = entry.key;
       currency.Currency currentCurrency = entry.value;
+      if (currencyCode == 'XLM') {
+        logger.i("Skipping trustline for native asset $currencyCode");
+        continue;
+      }
+      logger.i(
+          "Processing trustline for ${entry.key} with issuer ${entry.value.issuer}");
 
       String issuerAccountId = currentCurrency.issuer;
       Asset currencyAsset =
@@ -154,15 +179,19 @@ class Client {
 
       if (!response.success) {
         logger.e("Failed to add trustline for $currencyCode");
-        return false;
+        allTrustlinesAdded = false;
       } else {
-        logger.i("trustline for $currencyCode was added successfully");
-        return true;
+        logger.i("Trustline for $currencyCode was added successfully");
       }
     }
 
-    logger.i("No trustlines were processed");
-    return false;
+    if (allTrustlinesAdded) {
+      logger.i("All trustlines were added successfully");
+      return true;
+    } else {
+      logger.e("One or more trustlines failed to be added");
+      return false;
+    }
   }
 
   Future<bool> transfer(
@@ -231,7 +260,6 @@ class Client {
       );
 
       final data = jsonDecode(response.body);
-
       String trustlineTransaction = data['addtrustline_transaction'];
       XdrTransactionEnvelope xdrTxEnvelope =
           XdrTransactionEnvelope.fromEnvelopeXdrString(trustlineTransaction);
@@ -518,4 +546,263 @@ class Client {
       throw Exception("Couldn't get memo text due to ${e}");
     }
   }
+
+  Future<SubmitTransactionResponse> createOrder(
+      {required String sellingAssetCode,
+      required String buyingAssetCode,
+      required String amount,
+      required String price,
+      String? memo}) async {
+    if (!_currencies.currencies.containsKey(sellingAssetCode)) {
+      throw Exception('Sell asset $sellingAssetCode is not available.');
+    }
+    if (!_currencies.currencies.containsKey(buyingAssetCode)) {
+      throw Exception('Buy asset $buyingAssetCode is not available.');
+    }
+
+    late final Asset sellAsset;
+    late final Asset buyAsset;
+
+    if (sellingAssetCode == 'XLM') {
+      sellAsset = AssetTypeNative();
+    } else {
+      sellAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[sellingAssetCode]!.assetCode,
+          _currencies.currencies[sellingAssetCode]!.issuer);
+    }
+    if (buyingAssetCode == 'XLM') {
+      buyAsset = AssetTypeNative();
+    } else {
+      buyAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[buyingAssetCode]!.assetCode,
+          _currencies.currencies[buyingAssetCode]!.issuer);
+    }
+
+    final ManageBuyOfferOperation buyOfferOperation =
+        ManageBuyOfferOperationBuilder(sellAsset, buyAsset, amount, price)
+            .build();
+
+    final account = await _sdk.accounts.account(accountId);
+    final balances = account.balances;
+
+    try {
+      final sellAssetBalance = balances.firstWhere(
+        (balance) {
+          if (sellingAssetCode == 'XLM' && balance.assetCode == null) {
+            // Special case for XLM
+            return true;
+          } else {
+            return balance.assetCode == sellingAssetCode;
+          }
+        },
+        orElse: () {
+          logger.e("Sell asset $sellingAssetCode not found in balances.");
+          throw Exception('Insufficient balance in $sellingAssetCode');
+        },
+      );
+
+      final double sellAmount = double.parse(amount);
+      final double availableBalance = double.parse(sellAssetBalance.balance);
+
+      if (sellAmount > availableBalance) {
+        throw Exception(
+            'Insufficient balance in $sellingAssetCode. Available: $availableBalance');
+      }
+    } catch (e) {
+      logger.e("Error: ${e.toString()}");
+      rethrow;
+    }
+
+    final Transaction transaction = TransactionBuilder(account)
+        .addOperation(buyOfferOperation)
+        .addMemo(memo != null ? Memo.text(memo) : Memo.none())
+        .build();
+
+    transaction.sign(_keyPair, _stellarNetwork);
+    try {
+      final SubmitTransactionResponse response =
+          await _sdk.submitTransaction(transaction);
+      if (!response.success) {
+        logger.e('Transaction failed with result: ${response.resultXdr}');
+      }
+      return response;
+    } catch (error) {
+      throw Exception('Transaction failed due to: ${error.toString()}');
+    }
+  }
+
+  Future<SubmitTransactionResponse> cancelOrder(
+      {required String sellingAssetCode,
+      required String buyingAssetCode,
+      required String offerId,
+      String? memo}) async {
+    if (!_currencies.currencies.containsKey(sellingAssetCode)) {
+      throw Exception('Sell asset $sellingAssetCode is not available.');
+    }
+    if (!_currencies.currencies.containsKey(buyingAssetCode)) {
+      throw Exception('Buy asset $buyingAssetCode is not available.');
+    }
+
+    final offers = (await _sdk.offers.forAccount(accountId).execute()).records;
+    final OfferResponse? targetOffer = offers.firstWhere(
+      (offer) => offer.id == offerId,
+      orElse: () => throw Exception(
+          'Offer with ID $offerId not found in user\'s account.'),
+    );
+
+    late final Asset sellingAsset;
+    late final Asset buyingAsset;
+
+    if (sellingAssetCode == 'XLM') {
+      sellingAsset = AssetTypeNative();
+    } else {
+      sellingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[sellingAssetCode]!.assetCode,
+          _currencies.currencies[sellingAssetCode]!.issuer);
+    }
+    if (buyingAssetCode == 'XLM') {
+      buyingAsset = AssetTypeNative();
+    } else {
+      buyingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[buyingAssetCode]!.assetCode,
+          _currencies.currencies[buyingAssetCode]!.issuer);
+    }
+
+    final ManageBuyOfferOperation cancelOfferOperation =
+        ManageBuyOfferOperationBuilder(sellingAsset, buyingAsset, '0', '1')
+            .setOfferId(offerId)
+            .build();
+
+    final account = await _sdk.accounts.account(accountId);
+    final Transaction transaction = TransactionBuilder(account)
+        .addOperation(cancelOfferOperation)
+        .addMemo(memo != null ? Memo.text(memo) : Memo.none())
+        .build();
+    transaction.sign(_keyPair, _stellarNetwork);
+    try {
+      final SubmitTransactionResponse response =
+          await _sdk.submitTransaction(transaction);
+      if (!response.success) {
+        logger.e('Transaction failed with result: ${response.resultXdr}');
+      }
+      return response;
+    } catch (error) {
+      throw Exception('Transaction failed due to: ${error.toString()}');
+    }
+  }
+
+  Future<SubmitTransactionResponse> updateOrder(
+      {required String sellingAssetCode,
+      required String buyingAssetCode,
+      required String amount,
+      required String price,
+      required String offerId,
+      String? memo}) async {
+    if (!_currencies.currencies.containsKey(sellingAssetCode)) {
+      throw Exception('Sell asset $sellingAssetCode is not available.');
+    }
+    if (!_currencies.currencies.containsKey(buyingAssetCode)) {
+      throw Exception('Buy asset $buyingAssetCode is not available.');
+    }
+
+    final offers = (await _sdk.offers.forAccount(accountId).execute()).records;
+    final OfferResponse? targetOffer = offers.firstWhere(
+      (offer) => offer.id == offerId,
+      orElse: () => throw Exception(
+          'Offer with ID $offerId not found in user\'s account.'),
+    );
+
+    late final Asset sellingAsset;
+    late final Asset buyingAsset;
+
+    if (sellingAssetCode == 'XLM') {
+      sellingAsset = AssetTypeNative();
+    } else {
+      sellingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[sellingAssetCode]!.assetCode,
+          _currencies.currencies[sellingAssetCode]!.issuer);
+    }
+    if (buyingAssetCode == 'XLM') {
+      buyingAsset = AssetTypeNative();
+    } else {
+      buyingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[buyingAssetCode]!.assetCode,
+          _currencies.currencies[buyingAssetCode]!.issuer);
+    }
+
+    ManageBuyOfferOperation updateOfferOperation = ManageBuyOfferOperationBuilder(
+      sellingAsset,
+      buyingAsset,
+      amount,
+      price,
+    ).setOfferId(offerId).build();
+
+    final account = await _sdk.accounts.account(accountId);
+    final Transaction transaction = TransactionBuilder(account)
+        .addOperation(updateOfferOperation)
+        .build();
+    transaction.sign(_keyPair, _stellarNetwork);
+    try {
+      final SubmitTransactionResponse response =
+          await _sdk.submitTransaction(transaction);
+      if (!response.success) {
+        logger.e('Transaction failed with result: ${response.resultXdr}');
+      }
+      return response;
+    } catch (error) {
+      throw Exception('Transaction failed due to: ${error.toString()}');
+    }
+  }
+
+  Future<Stream<OrderBookResponse>> getOrderBook(
+      {required String sellingAssetCode,
+      required String buyingAssetCode}) async {
+    if (!_currencies.currencies.containsKey(sellingAssetCode)) {
+      throw Exception('Sell asset $sellingAssetCode is not available.');
+    }
+    if (!_currencies.currencies.containsKey(buyingAssetCode)) {
+      throw Exception('Buy asset $buyingAssetCode is not available.');
+    }
+    http.Client httpClient = http.Client();
+    Uri serverURI = Uri.parse(_horizonServerUrls[_network.toString()]!);
+    late final Asset sellingAsset;
+    late final Asset buyingAsset;
+
+    if (sellingAssetCode == 'XLM') {
+      sellingAsset = AssetTypeNative();
+    } else {
+      sellingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[sellingAssetCode]!.assetCode,
+          _currencies.currencies[sellingAssetCode]!.issuer);
+    }
+    if (buyingAssetCode == 'XLM') {
+      buyingAsset = AssetTypeNative();
+    } else {
+      buyingAsset = AssetTypeCreditAlphaNum4(
+          _currencies.currencies[buyingAssetCode]!.assetCode,
+          _currencies.currencies[buyingAssetCode]!.issuer);
+    }
+
+    OrderBookRequestBuilder orderBookRequest =
+        OrderBookRequestBuilder(httpClient, serverURI)
+          ..sellingAsset(sellingAsset)
+          ..buyingAsset(buyingAsset);
+
+    return await orderBookRequest.stream();
+  }
+
+  Future<List<OfferResponse>> listMyOffers() async {
+    try {
+      final offers = await _sdk.offers.forAccount(accountId).execute();
+
+      if (offers.records.isEmpty) {
+        logger.i('No offers found for account: $accountId');
+        return [];
+      }
+
+      return offers.records;
+    } catch (error) {
+      throw Exception('Error listing offers for account $accountId: $error');
+    }
+  }
 }

packages/stellar_client/pubspec.lock

@@ -159,10 +159,10 @@ packages:
     dependency: "direct main"
     description:
       name: http
-      sha256: b9c29a161230ee03d3ccf545097fccd9b87a5264228c5d348202e0f0c28f9010
+      sha256: fe7ab022b76f3034adc518fb6ea04a82387620e19977665ea18d30a1cf43442f
       url: "https://pub.dev"
     source: hosted
-    version: "1.2.2"
+    version: "1.3.0"
   http_multi_server:
     dependency: transitive
     description:

packages/stellar_client/pubspec.yaml

@@ -7,7 +7,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
-  http: ^1.2.2
+  http: 1.3.0
   stellar_flutter_sdk: ^1.9.2
 
 dev_dependencies: