Luồng Giao Dịch Đầy Đủ của Kora

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KORA GASLESS TRANSACTION DEMO
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[1/6] Initializing clients
  → Kora RPC: http://localhost:8080/
  → Solana RPC: http://127.0.0.1:8899

[2/6] Setting up keypairs
  → Sender: BYJVBqQ2xV9GECc84FeoPQy2DpgoonZQFQu97MMWTbBc
  → Destination: C8MC9E6nf9Am1rVqdDedDavm53uCJMiSwarEko1aXmny
  → Kora signer address: 3Z1Ef7YaxK8oUMoi6exf7wYZjZKWJJsrzJXSt1c3qrDE

[3/6] Creating demonstration instructions
  → Payment token: 9BgeTKqmFsPVnfYscfM6NvsgmZxei7XfdciShQ6D3bxJ
  ✓ Token transfer instruction created
  ✓ SOL transfer instruction created
  ✓ Memo instruction created
  → Total: 3 instructions

[4/6] Estimating Kora fee and assembling payment instruction
  → Fee payer: 3Z1Ef7Ya...
  → Blockhash: 7HZUaMqV...
  ✓ Estimate transaction built
  ✓ Payment instruction received from Kora

[5/6] Creating and signing final transaction (with payment)
  ✓ Final transaction built with payment
  ✓ Transaction signed by user

[6/6] Signing transaction with Kora and sending to Solana cluster
  ✓ Transaction co-signed by Kora
  ✓ Transaction submitted to network
  ⏳ Awaiting confirmation...

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SUCCESS: Transaction confirmed on Solana
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Transaction signature:
41hmwmkMfHR5mmhG9sNkjiakwHxpmr1H3Gi3bBL8v5PbsRrH7FhpUT8acHaf2mrPKNVD894dSYXfjp6LfAbVpcCE

View on explorer:
https://explorer.solana.com/tx/41hmwmkMfHR5mmhG9sNkjiakwHxpmr1H3Gi3bBL8v5PbsRrH7FhpUT8acHaf2mrPKNVD894dSYXfjp6LfAbVpcCE?cluster=custom&customUrl=http%3A%2F%2Flocalhost%3A8899

cd kora/examples/getting-started/demo/client

import { KoraClient } from "@solana/kora";
import {
  createKeyPairSignerFromBytes,
  getBase58Encoder,
  createNoopSigner,
  address,
  getBase64EncodedWireTransaction,
  partiallySignTransactionMessageWithSigners,
  Blockhash,
  Base64EncodedWireTransaction,
  partiallySignTransaction,
  TransactionVersion,
  Instruction,
  KeyPairSigner,
  Rpc,
  SolanaRpcApi,
  createSolanaRpc,
  createSolanaRpcSubscriptions,
  pipe,
  createTransactionMessage,
  setTransactionMessageFeePayerSigner,
  setTransactionMessageLifetimeUsingBlockhash,
  MicroLamports,
  appendTransactionMessageInstructions
} from "@solana/kit";
import { getAddMemoInstruction } from "@solana-program/memo";
import { createRecentSignatureConfirmationPromiseFactory } from "@solana/transaction-confirmation";
import {
  updateOrAppendSetComputeUnitLimitInstruction,
  updateOrAppendSetComputeUnitPriceInstruction
} from "@solana-program/compute-budget";
import dotenv from "dotenv";
import path from "path";

dotenv.config({ path: path.join(process.cwd(), "..", ".env") });

const CONFIG = {
  computeUnitLimit: 200_000,
  computeUnitPrice: 1_000_000n as MicroLamports,
  solanaRpcUrl: "http://127.0.0.1:8899",
  solanaWsUrl: "ws://127.0.0.1:8900",
  koraRpcUrl: "http://localhost:8080/"
};

async function getEnvKeyPair(envKey: string) {
  if (!process.env[envKey]) {
    throw new Error(`Environment variable ${envKey} is not set`);
  }
  const base58Encoder = getBase58Encoder();
  const b58SecretEncoded = base58Encoder.encode(process.env[envKey]);
  return await createKeyPairSignerFromBytes(b58SecretEncoded);
}

async function initializeClients() {
  console.log("\n[1/6] Initializing clients");
  console.log("  → Kora RPC:", CONFIG.koraRpcUrl);
  console.log("  → Solana RPC:", CONFIG.solanaRpcUrl);

  const client = new KoraClient({
    rpcUrl: CONFIG.koraRpcUrl
    // apiKey: process.env.KORA_API_KEY, // Uncomment if authentication is enabled
    // hmacSecret: process.env.KORA_HMAC_SECRET, // Uncomment if HMAC is enabled
  });

  const rpc = createSolanaRpc(CONFIG.solanaRpcUrl);
  const rpcSubscriptions = createSolanaRpcSubscriptions(CONFIG.solanaWsUrl);

  const confirmTransaction = createRecentSignatureConfirmationPromiseFactory({
    rpc,
    rpcSubscriptions
  });

  return { client, rpc, confirmTransaction };
}

async function setupKeys(client: KoraClient) {
  console.log("\n[2/6] Setting up keypairs");

  const testSenderKeypair = await getEnvKeyPair("TEST_SENDER_KEYPAIR");
  const destinationKeypair = await getEnvKeyPair("DESTINATION_KEYPAIR");
  const { signer_address } = await client.getPayerSigner();

  console.log("  → Sender:", testSenderKeypair.address);
  console.log("  → Destination:", destinationKeypair.address);
  console.log("  → Kora signer address:", signer_address);

  return { testSenderKeypair, destinationKeypair, signer_address };
}

async function createInstructions(
  client: KoraClient,
  testSenderKeypair: KeyPairSigner,
  destinationKeypair: KeyPairSigner
) {
  console.log("\n[3/6] Creating demonstration instructions");

  const paymentToken = await client
    .getConfig()
    .then((config) => config.validation_config.allowed_spl_paid_tokens[0]);
  console.log("  → Payment token:", paymentToken);

  // Create token transfer (will initialize ATA if needed)
  const transferTokens = await client.transferTransaction({
    amount: 10_000_000, // 10 USDC (6 decimals)
    token: paymentToken,
    source: testSenderKeypair.address,
    destination: destinationKeypair.address
  });
  console.log("  ✓ Token transfer instruction created");

  // Create SOL transfer
  const transferSol = await client.transferTransaction({
    amount: 10_000_000, // 0.01 SOL (9 decimals)
    token: "11111111111111111111111111111111", // SOL mint address
    source: testSenderKeypair.address,
    destination: destinationKeypair.address
  });
  console.log("  ✓ SOL transfer instruction created");

  // Add memo instruction
  const memoInstruction = getAddMemoInstruction({
    memo: "Hello, Kora!"
  });
  console.log("  ✓ Memo instruction created");

  const instructions = [
    ...transferTokens.instructions,
    ...transferSol.instructions,
    memoInstruction
  ];

  console.log(`  → Total: ${instructions.length} instructions`);
  return { instructions, paymentToken };
}

async function getPaymentInstruction(
  client: KoraClient,
  instructions: Instruction[],
  testSenderKeypair: KeyPairSigner,
  paymentToken: string
): Promise<{ paymentInstruction: Instruction }> {
  console.log("\n[4/6] Estimating Kora fee and assembling payment instruction");

  const { signer_address } = await client.getPayerSigner();
  const noopSigner = createNoopSigner(address(signer_address));
  const latestBlockhash = await client.getBlockhash();

  console.log("  → Fee payer:", signer_address.slice(0, 8) + "...");
  console.log("  → Blockhash:", latestBlockhash.blockhash.slice(0, 8) + "...");

  // Create estimate transaction to get payment instruction
  const estimateTransaction = pipe(
    createTransactionMessage({ version: 0 }),
    (tx) => setTransactionMessageFeePayerSigner(noopSigner, tx),
    (tx) =>
      setTransactionMessageLifetimeUsingBlockhash(
        {
          blockhash: latestBlockhash.blockhash as Blockhash,
          lastValidBlockHeight: 0n
        },
        tx
      ),
    (tx) => appendTransactionMessageInstructions(instructions, tx),
    (tx) =>
      updateOrAppendSetComputeUnitPriceInstruction(CONFIG.computeUnitPrice, tx),
    (tx) =>
      updateOrAppendSetComputeUnitLimitInstruction(CONFIG.computeUnitLimit, tx)
  );

  const signedEstimateTransaction =
    await partiallySignTransactionMessageWithSigners(estimateTransaction);
  const base64EncodedWireTransaction = getBase64EncodedWireTransaction(
    signedEstimateTransaction
  );
  console.log("  ✓ Estimate transaction built");

  // Get payment instruction from Kora
  const paymentInstruction = await client.getPaymentInstruction({
    transaction: base64EncodedWireTransaction,
    fee_token: paymentToken,
    source_wallet: testSenderKeypair.address
  });
  console.log("  ✓ Payment instruction received from Kora");

  return { paymentInstruction: paymentInstruction.payment_instruction };
}

async function getFinalTransaction(
  client: KoraClient,
  paymentInstruction: Instruction,
  testSenderKeypair: KeyPairSigner,
  instructions: Instruction[],
  signer_address: string
): Promise<Base64EncodedWireTransaction> {
  console.log("\n[5/6] Creating and signing final transaction (with payment)");
  const noopSigner = createNoopSigner(address(signer_address));

  // Build final transaction with payment instruction
  const newBlockhash = await client.getBlockhash();
  const fullTransaction = pipe(
    createTransactionMessage({ version: 0 }),
    (tx) => setTransactionMessageFeePayerSigner(noopSigner, tx),
    (tx) =>
      setTransactionMessageLifetimeUsingBlockhash(
        {
          blockhash: newBlockhash.blockhash as Blockhash,
          lastValidBlockHeight: 0n
        },
        tx
      ),
    (tx) =>
      appendTransactionMessageInstructions(
        [...instructions, paymentInstruction],
        tx
      ),
    (tx) =>
      updateOrAppendSetComputeUnitPriceInstruction(CONFIG.computeUnitPrice, tx),
    (tx) =>
      updateOrAppendSetComputeUnitLimitInstruction(CONFIG.computeUnitLimit, tx)
  );
  console.log("  ✓ Final transaction built with payment");

  // Sign with user keypair
  const signedFullTransaction =
    await partiallySignTransactionMessageWithSigners(fullTransaction);
  const userSignedTransaction = await partiallySignTransaction(
    [testSenderKeypair.keyPair],
    signedFullTransaction
  );
  const base64EncodedWireFullTransaction = getBase64EncodedWireTransaction(
    userSignedTransaction
  );
  console.log("  ✓ Transaction signed by user");

  return base64EncodedWireFullTransaction;
}

async function submitTransaction(
  client: KoraClient,
  rpc: Rpc<SolanaRpcApi>,
  confirmTransaction: ReturnType<
    typeof createRecentSignatureConfirmationPromiseFactory
  >,
  signedTransaction: Base64EncodedWireTransaction,
  signer_address: string
) {
  console.log(
    "\n[6/6] Signing transaction with Kora and sending to Solana cluster"
  );

  // Get Kora's signature
  const { signed_transaction } = await client.signTransaction({
    transaction: signedTransaction,
    signer_key: signer_address
  });
  console.log("  ✓ Transaction co-signed by Kora");

  // Submit to Solana network
  const signature = await rpc
    .sendTransaction(signed_transaction as Base64EncodedWireTransaction, {
      encoding: "base64"
    })
    .send();
  console.log("  ✓ Transaction submitted to network");

  console.log("  ⏳ Awaiting confirmation...");
  await confirmTransaction({
    commitment: "confirmed",
    signature,
    abortSignal: new AbortController().signal
  });

  console.log("\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
  console.log("SUCCESS: Transaction confirmed on Solana");
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
  console.log("\nTransaction signature:");
  console.log(signature);

  return signature;
}

async function main() {
  console.log("\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
  console.log("KORA GASLESS TRANSACTION DEMO");
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");

  try {
    // Step 1: Initialize clients
    const { client, rpc, confirmTransaction } = await initializeClients();

    // Step 2: Setup keys
    const { testSenderKeypair, destinationKeypair, signer_address } =
      await setupKeys(client);

    // Step 3: Create demo instructions
    const { instructions, paymentToken } = await createInstructions(
      client,
      testSenderKeypair,
      destinationKeypair
    );

    // Step 4: Get payment instruction from Kora
    const { paymentInstruction } = await getPaymentInstruction(
      client,
      instructions,
      testSenderKeypair,
      paymentToken
    );

    // Step 5: Create and partially sign final transaction
    const finalSignedTransaction = await getFinalTransaction(
      client,
      paymentInstruction,
      testSenderKeypair,
      instructions,
      signer_address
    );

    // Step 6: Get Kora's signature and submit to Solana cluster
    await submitTransaction(
      client,
      rpc,
      confirmTransaction,
      finalSignedTransaction,
      signer_address
    );
  } catch (error) {
    console.error("\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
    console.error("ERROR: Demo failed");
    console.error("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
    console.error("\nDetails:", error);
    process.exit(1);
  }
}

solana-test-validator -r

kora rpc start --signers-config signers.toml

pnpm init-env

# From the client directory
pnpm full-demo