chore: add create contract example (#659)

examples/src/main/java/network/lightsail/SorobanCreateContract.java

@@ -0,0 +1,112 @@
+package network.lightsail;
+
+import java.util.List;
+import org.stellar.sdk.Address;
+import org.stellar.sdk.KeyPair;
+import org.stellar.sdk.Network;
+import org.stellar.sdk.SorobanServer;
+import org.stellar.sdk.StrKey;
+import org.stellar.sdk.Transaction;
+import org.stellar.sdk.TransactionBuilder;
+import org.stellar.sdk.TransactionBuilderAccount;
+import org.stellar.sdk.exception.NetworkException;
+import org.stellar.sdk.exception.PrepareTransactionException;
+import org.stellar.sdk.operations.InvokeHostFunctionOperation;
+import org.stellar.sdk.responses.sorobanrpc.GetTransactionResponse;
+import org.stellar.sdk.responses.sorobanrpc.SendTransactionResponse;
+import org.stellar.sdk.scval.Scv;
+import org.stellar.sdk.xdr.SCVal;
+import org.stellar.sdk.xdr.TransactionMeta;
+
+public class SorobanCreateContract {
+  public static void main(String[] args) {
+    String secret = "SAAPYAPTTRZMCUZFPG3G66V4ZMHTK4TWA6NS7U4F7Z3IMUD52EK4DDEV";
+    String rpcServerUrl = "https://soroban-testnet.stellar.org:443";
+    Network network = Network.TESTNET;
+
+    KeyPair keyPair = KeyPair.fromSecretSeed(secret);
+    SorobanServer sorobanServer = new SorobanServer(rpcServerUrl);
+    TransactionBuilderAccount source = sorobanServer.getAccount(keyPair.getAccountId());
+
+    String wasmId = "406edc375a4334ea2849d22e490919a5456ee176dd2f9fc3e1e557cd242ec593";
+    List<SCVal> constructorArgs =
+        List.of(Scv.toString("World!")); // Scv is a helper class to create SCVal objects
+    InvokeHostFunctionOperation invokeHostFunctionOperation =
+        InvokeHostFunctionOperation.createContractOperationBuilder(
+                wasmId, new Address(keyPair.getAccountId()), constructorArgs, null)
+            .build();
+
+    // Build the transaction
+    Transaction unpreparedTransaction =
+        new TransactionBuilder(source, network)
+            .setBaseFee(Transaction.MIN_BASE_FEE)
+            .addOperation(invokeHostFunctionOperation)
+            .setTimeout(300)
+            .build();
+
+    // Prepare the transaction
+    Transaction transaction;
+    try {
+      transaction = sorobanServer.prepareTransaction(unpreparedTransaction);
+    } catch (PrepareTransactionException e) {
+      throw new RuntimeException("Prepare transaction failed", e);
+    } catch (NetworkException e) {
+      throw new RuntimeException("Network error", e);
+    }
+
+    // Sign the transaction
+    transaction.sign(keyPair);
+
+    // Send the transaction
+    SendTransactionResponse sendTransactionResponse;
+    try {
+      sendTransactionResponse = sorobanServer.sendTransaction(transaction);
+    } catch (NetworkException e) {
+      throw new RuntimeException("Send transaction failed", e);
+    }
+    if (!SendTransactionResponse.SendTransactionStatus.PENDING.equals(
+        sendTransactionResponse.getStatus())) {
+      throw new RuntimeException("Send transaction failed: " + sendTransactionResponse);
+    }
+
+    // Check the transaction status
+    GetTransactionResponse getTransactionResponse;
+    while (true) {
+      try {
+        getTransactionResponse = sorobanServer.getTransaction(sendTransactionResponse.getHash());
+      } catch (NetworkException e) {
+        throw new RuntimeException("Get transaction failed", e);
+      }
+
+      if (!GetTransactionResponse.GetTransactionStatus.NOT_FOUND.equals(
+          getTransactionResponse.getStatus())) {
+        break;
+      }
+      // Wait for 3 seconds before checking the transaction status again
+      try {
+        Thread.sleep(3000);
+      } catch (InterruptedException e) {
+        e.printStackTrace();
+      }
+    }
+
+    if (GetTransactionResponse.GetTransactionStatus.SUCCESS.equals(
+        getTransactionResponse.getStatus())) {
+      System.out.println("Transaction succeeded: " + getTransactionResponse);
+      // parse the function return value
+      TransactionMeta transactionMeta = getTransactionResponse.parseResultMetaXdr();
+      byte[] hash =
+          transactionMeta
+              .getV3()
+              .getSorobanMeta()
+              .getReturnValue()
+              .getAddress()
+              .getContractId()
+              .getHash();
+      String contractId = StrKey.encodeContract(hash);
+      System.out.println("Contract ID: " + contractId);
+    } else {
+      System.out.println("Transaction failed: " + getTransactionResponse);
+    }
+  }
+}