Merge pull request #134 from kumulynja/default-ltbl-esplora

add default config methods for Blockchain

Author: BitcoinZavior

example/lib/bdk_library.dart

@@ -20,10 +20,7 @@ class BdkLibrary {
   }
 
   Future<Blockchain> initializeBlockchain() async {
-    return await Blockchain.create(
-        config: const BlockchainConfig.esplora(
-            config: EsploraConfig(
-                baseUrl: 'https://mutinynet.com/api', stopGap: 10)));
+    return Blockchain.createMutinynet();
   }
 
   Future<Wallet> restoreWallet(Descriptor descriptor) async {
@@ -95,7 +92,11 @@ class BdkLibrary {
   }
 
   sendBitcoin(
-      Blockchain blockchain, Wallet aliceWallet, String addressStr) async {
+    Blockchain blockchain,
+    Wallet aliceWallet,
+    String addressStr,
+    int amountSat,
+  ) async {
     try {
       final txBuilder = TxBuilder();
       final address = await Address.fromString(
@@ -104,7 +105,7 @@ class BdkLibrary {
       final script = await address.scriptPubkey();
       final feeRate = await estimateFeeRate(25, blockchain);
       final (psbt, _) = await txBuilder
-          .addRecipient(script, 750)
+          .addRecipient(script, amountSat)
           .feeRate(feeRate.satPerVb)
           .finish(aliceWallet);
       final isFinalized = await aliceWallet.sign(psbt: psbt);

example/lib/simple_wallet.dart

@@ -25,11 +25,12 @@ class _SimpleWalletState extends State<SimpleWallet> {
 
   generateMnemonicKeys() async {
     final res = await lib.createMnemonic();
+    final mnemonic = await res.asString();
     setState(() {
-      displayText = res.toString();
+      displayText = mnemonic;
     });
     if (kDebugMode) {
-      print(await res.asString());
+      print(mnemonic);
     }
   }
 
@@ -49,11 +50,13 @@ class _SimpleWalletState extends State<SimpleWallet> {
   }
 
   getNewAddress() async {
-    final res = (await (await lib.getAddress(aliceWallet)).address.asString());
-    debugPrint(res);
+    final addressInfo = await lib.getAddress(aliceWallet);
+    final address = await addressInfo.address.asString();
+
+    debugPrint(address);
 
     setState(() {
-      displayText = "Address: $res";
+      displayText = "Address: $address \n Index: ${addressInfo.index}";
     });
   }
 
@@ -152,9 +155,13 @@ class _SimpleWalletState extends State<SimpleWallet> {
     }
   }
 
-  sendBit() async {
+  sendBit(int amountSat) async {
     await lib.sendBitcoin(
-        blockchain!, aliceWallet, "tb1qyhssajdx5vfxuatt082m9tsfmxrxludgqwe52f");
+      blockchain!,
+      aliceWallet,
+      "tb1qyhssajdx5vfxuatt082m9tsfmxrxludgqwe52f",
+      amountSat,
+    );
   }
 
   @override
@@ -286,9 +293,9 @@ class _SimpleWalletState extends State<SimpleWallet> {
                         fontWeight: FontWeight.w800),
                   )),
               TextButton(
-                  onPressed: () => sendBit(),
+                  onPressed: () => sendBit(100000),
                   child: const Text(
-                    'Press to send 1200 satoshi',
+                    'Press to send 100k sats',
                     style: TextStyle(
                         color: Colors.indigoAccent,
                         fontSize: 12,

lib/src/root.dart

@@ -61,6 +61,30 @@ class Blockchain extends BdkBlockchain {
     }
   }
 
+  static Future<Blockchain> createMutinynet({
+    int stopGap = 20,
+  }) async {
+    final config = BlockchainConfig.esplora(
+      config: EsploraConfig(
+        baseUrl: 'https://mutinynet.ltbl.io/api',
+        stopGap: stopGap,
+      ),
+    );
+    return create(config: config);
+  }
+
+  static Future<Blockchain> createTestnet({
+    int stopGap = 20,
+  }) async {
+    final config = BlockchainConfig.esplora(
+      config: EsploraConfig(
+        baseUrl: 'https://testnet.ltbl.io/api',
+        stopGap: stopGap,
+      ),
+    );
+    return create(config: config);
+  }
+
   ///Estimate the fee rate required to confirm a transaction in a given target of blocks
   @override
   Future<FeeRate> estimateFee({required int target, hint}) async {