feat: add prepare_merge_coins example (#262)

Author: Thoralf-M

bindings/go/examples/prepare_merge_coins/main.go

@@ -0,0 +1,45 @@
+// Copyright (c) 2025 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
+package main
+
+import (
+	"log"
+
+	sdk "bindings/iota_sdk_ffi"
+)
+
+func main() {
+	client := sdk.GraphQlClientNewDevnet()
+
+	sender, _ := sdk.AddressFromHex("0x611830d3641a68f94a690dcc25d1f4b0dac948325ac18f6dd32564371735f32c")
+
+	coin0, _ := sdk.ObjectIdFromHex("0x0b0270ee9d27da0db09651e5f7338dfa32c7ee6441ccefa1f6e305735bcfc7ab")
+	coin1, _ := sdk.ObjectIdFromHex("0xd04077fe3b6fad13b3d4ed0d535b7ca92afcac8f0f2a0e0925fb9f4f0b30c699")
+
+	builder := sdk.TransactionBuilderInit(sender, client)
+	builder.MergeCoins(coin0, []*sdk.ObjectId{coin1})
+
+	txn, err := builder.Finish()
+	if err.(*sdk.SdkFfiError) != nil {
+		log.Fatalf("Failed to create transaction: %v", err)
+	}
+
+	txnBytes, err := txn.BcsSerialize()
+	if err != nil {
+		log.Fatalf("Failed to serialize transaction: %v", err)
+	}
+	log.Printf("Signing Digest: %v", sdk.HexEncode(txn.SigningDigest()))
+	log.Printf("Txn Bytes: %v", sdk.Base64Encode(txnBytes))
+
+	res, err := builder.DryRun(false)
+	if err.(*sdk.SdkFfiError) != nil {
+		log.Fatalf("Failed to merge coins: %v", err)
+	}
+
+	if res.Error != nil {
+		log.Fatalf("Failed to merge coins: %v", *res.Error)
+	}
+
+	log.Print("Merge coins dry run was successful!")
+}

bindings/kotlin/examples/PrepareMergeCoins.kt

@@ -0,0 +1,44 @@
+// Copyright (c) 2025 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
+import iota_sdk.*
+import kotlinx.coroutines.runBlocking
+
+fun main() = runBlocking {
+    try {
+        val client = GraphQlClient.newDevnet()
+
+        val sender =
+                Address.fromHex(
+                        "0x611830d3641a68f94a690dcc25d1f4b0dac948325ac18f6dd32564371735f32c"
+                )
+
+        val coin0 =
+                ObjectId.fromHex(
+                        "0x0b0270ee9d27da0db09651e5f7338dfa32c7ee6441ccefa1f6e305735bcfc7ab"
+                )
+        val coin1 =
+                ObjectId.fromHex(
+                        "0xd04077fe3b6fad13b3d4ed0d535b7ca92afcac8f0f2a0e0925fb9f4f0b30c699"
+                )
+
+        val builder = TransactionBuilder.init(sender, client)
+
+        builder.mergeCoins(coin0, listOf(coin1))
+
+        val txn = builder.finish()
+
+        println("Signing Digest: ${hexEncode(txn.signingDigest())}")
+        println("Txn Bytes: ${base64Encode(txn.bcsSerialize())}")
+
+        val res = builder.dryRun()
+
+        if (res.error != null) {
+            throw Exception("Failed to merge coins: ${res.error}")
+        }
+
+        println("Merge coins dry run was successful!")
+    } catch (e: Exception) {
+        println("Error: $e")
+    }
+}

bindings/python/examples/prepare_merge_coins.py

@@ -0,0 +1,44 @@
+# Copyright (c) 2025 IOTA Stiftung
+# SPDX-License-Identifier: Apache-2.0
+
+from lib.iota_sdk_ffi import *
+
+import asyncio
+
+
+async def main():
+    try:
+        client = GraphQlClient.new_devnet()
+
+        sender = Address.from_hex(
+            "0x611830d3641a68f94a690dcc25d1f4b0dac948325ac18f6dd32564371735f32c"
+        )
+
+        coin_0 = ObjectId.from_hex(
+            "0x0b0270ee9d27da0db09651e5f7338dfa32c7ee6441ccefa1f6e305735bcfc7ab"
+        )
+        coin_1 = ObjectId.from_hex(
+            "0xd04077fe3b6fad13b3d4ed0d535b7ca92afcac8f0f2a0e0925fb9f4f0b30c699"
+        )
+
+        builder = await TransactionBuilder.init(sender, client)
+
+        builder.merge_coins(coin_0, [coin_1])
+
+        txn = await builder.finish()
+
+        print("Signing Digest:", hex_encode(txn.signing_digest()))
+        print("Txn Bytes:", base64_encode(txn.bcs_serialize()))
+
+        res = await builder.dry_run()
+        if res.error is not None:
+            raise Exception("Failed to merge coins:", res.error)
+
+        print("Merge coins dry run was successful!")
+
+    except Exception as e:
+        print(f"Error: {e}")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())

crates/iota-graphql-client/examples/prepare_merge_coins.rs

@@ -0,0 +1,44 @@
+// Copyright (c) 2025 IOTA Stiftung
+// SPDX-License-Identifier: Apache-2.0
+
+use std::str::FromStr;
+
+use base64ct::Encoding;
+use eyre::Result;
+use iota_graphql_client::Client;
+use iota_transaction_builder::TransactionBuilder;
+use iota_types::{Address, ObjectId};
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let client = Client::new_devnet();
+
+    let sender =
+        Address::from_str("0x611830d3641a68f94a690dcc25d1f4b0dac948325ac18f6dd32564371735f32c")?;
+    let coin_0 =
+        ObjectId::from_str("0x0b0270ee9d27da0db09651e5f7338dfa32c7ee6441ccefa1f6e305735bcfc7ab")?;
+    let coin_1 =
+        ObjectId::from_str("0xd04077fe3b6fad13b3d4ed0d535b7ca92afcac8f0f2a0e0925fb9f4f0b30c699")?;
+
+    let mut builder = TransactionBuilder::new(sender).with_client(client.clone());
+
+    builder.merge_coins(coin_0, [coin_1]);
+
+    let txn = builder.finish().await?;
+
+    println!("Signing Digest: {}", hex::encode(txn.signing_digest()));
+    println!(
+        "Txn Bytes: {}",
+        base64ct::Base64::encode_string(&bcs::to_bytes(&txn)?)
+    );
+
+    let res = client.dry_run_tx(&txn, false).await?;
+
+    if let Some(err) = res.error {
+        eyre::bail!("Failed to merge coin: {err}");
+    }
+
+    println!("Merge coin dry run was successful!");
+
+    Ok(())
+}