Fix byte prefix of write instruction in generated clients (#13)

Author: lorisleiva

Cargo.lock

@@ -0,0 +1,108 @@
+import { getCreateAccountInstruction } from '@solana-program/system';
+import {
+    BaseTransactionMessage,
+    Commitment,
+    Instruction,
+    Rpc,
+    RpcSubscriptions,
+    SolanaRpcApi,
+    SolanaRpcSubscriptionsApi,
+    TransactionMessageWithBlockhashLifetime,
+    TransactionMessageWithFeePayer,
+    TransactionSigner,
+    airdropFactory,
+    appendTransactionMessageInstructions,
+    assertIsSendableTransaction,
+    assertIsTransactionWithBlockhashLifetime,
+    createSolanaRpc,
+    createSolanaRpcSubscriptions,
+    createTransactionMessage,
+    generateKeyPairSigner,
+    getSignatureFromTransaction,
+    lamports,
+    pipe,
+    sendAndConfirmTransactionFactory,
+    setTransactionMessageFeePayerSigner,
+    setTransactionMessageLifetimeUsingBlockhash,
+    signTransactionMessageWithSigners,
+} from '@solana/kit';
+import { getInitializeBufferInstruction, LOADER_V3_PROGRAM_ADDRESS } from './src';
+
+export const BUFFER_HEADER_SIZE = 37n;
+
+type Client = {
+    rpc: Rpc<SolanaRpcApi>;
+    rpcSubscriptions: RpcSubscriptions<SolanaRpcSubscriptionsApi>;
+};
+
+export const createDefaultSolanaClient = (): Client => {
+    const rpc = createSolanaRpc('http://127.0.0.1:8899');
+    const rpcSubscriptions = createSolanaRpcSubscriptions('ws://127.0.0.1:8900');
+    return { rpc, rpcSubscriptions };
+};
+
+export const generateKeyPairSignerWithSol = async (client: Client, putativeLamports: bigint = 1_000_000_000n) => {
+    const signer = await generateKeyPairSigner();
+    await airdropFactory(client)({
+        recipientAddress: signer.address,
+        lamports: lamports(putativeLamports),
+        commitment: 'confirmed',
+    });
+    return signer;
+};
+
+export const createDefaultTransactionMessage = async (
+    client: Client,
+    feePayer: TransactionSigner,
+    instructions?: Instruction[],
+) => {
+    const { value: latestBlockhash } = await client.rpc.getLatestBlockhash().send();
+    return pipe(
+        createTransactionMessage({ version: 0 }),
+        tx => setTransactionMessageFeePayerSigner(feePayer, tx),
+        tx => setTransactionMessageLifetimeUsingBlockhash(latestBlockhash, tx),
+        tx => (instructions ? appendTransactionMessageInstructions(instructions, tx) : tx),
+    );
+};
+
+export const signAndSendTransaction = async (
+    client: Client,
+    transactionMessage: BaseTransactionMessage &
+        TransactionMessageWithFeePayer &
+        TransactionMessageWithBlockhashLifetime,
+    commitment: Commitment = 'confirmed',
+) => {
+    const signedTransaction = await signTransactionMessageWithSigners(transactionMessage);
+    const signature = getSignatureFromTransaction(signedTransaction);
+    assertIsSendableTransaction(signedTransaction);
+    assertIsTransactionWithBlockhashLifetime(signedTransaction);
+    await sendAndConfirmTransactionFactory(client)(signedTransaction, {
+        commitment,
+    });
+    return signature;
+};
+
+export async function getCreateBufferInstructions(
+    client: Client,
+    input: {
+        payer: TransactionSigner;
+        buffer: TransactionSigner;
+        dataLength: number | bigint;
+    },
+) {
+    const bufferSize = BUFFER_HEADER_SIZE + BigInt(input.dataLength);
+    const bufferLamports = await client.rpc.getMinimumBalanceForRentExemption(bufferSize).send();
+    return [
+        getCreateAccountInstruction({
+            payer: input.payer,
+            newAccount: input.buffer,
+            lamports: bufferLamports,
+            space: bufferSize,
+            programAddress: LOADER_V3_PROGRAM_ADDRESS,
+        }),
+        getInitializeBufferInstruction({
+            sourceAccount: input.buffer.address,
+            bufferAuthority: input.payer.address,
+        }),
+    ];
+}

clients/js/_setup.ts

@@ -38,6 +38,7 @@
         "@solana/kit": "^5.0"
     },
     "devDependencies": {
+        "@solana-program/system": "^0.10.0",
         "@solana/eslint-config-solana": "^6.0.0",
         "@solana/kit": "^5.0",
         "@types/node": "^24",