SayHi.js

const {
    Connection,
    Keypair,
    Transaction,
    SystemProgram,
    LAMPORTS_PER_SOL,
    PublicKey,
    TransactionInstruction,
    sendAndConfirmTransaction,
  } = require("@solana/web3.js");
  
  const { extractKeys } = require("./KeyExtractor");
  
  const CONTRACT_ADDRESS = "<PUT_GENERATED_PROGRAM_ID_HERE>";
  async function callGetMessage() {
  
    const connection = new Connection('http://localhost:8899', 'confirmed');
    const programId = new PublicKey(CONTRACT_ADDRESS)
  
    const keyData = await extractKeys();
    const wallet = keyData.keyPair;
  
    // Client
    console.log("My address:", wallet.publicKey.toString());
    const balance = await connection.getBalance(wallet.publicKey);
    console.log(`My balance: ${balance / LAMPORTS_PER_SOL} SOL`);
  
    // get the metrics on the program
    const accountInfo = await connection.getAccountInfo(programId);
    if (accountInfo?.data) {
        console.log(
            `The size of Program ID ${CONTRACT_ADDRESS} is ${accountInfo?.data.length}`
        );
    } else {
        console.log("No data found for the account");
    }
  
    const instruction = new TransactionInstruction({
        keys: [], // Add account keys if required by the program
        programId: programId,
        data: Buffer.alloc(0), // No instruction data needed for getMessage()
    });
  
    const lamports = await connection.getMinimumBalanceForRentExemption(accountInfo?.data.length || 0);
  
    const transaction = new Transaction().add(instruction);
  
    transaction.feePayer = wallet.publicKey;
  
    const txHash = await sendAndConfirmTransaction(
        connection,
        transaction,
        [wallet]
    );
  
    console.log(`Transaction confirmed: ${txHash}`);
  
    const transactionResponse = await connection.getTransaction(txHash);
  
    //Take a look at the entire response. What the hell.
    console.log(JSON.stringify(transactionResponse, null, 2));
  
    // Extract the message from the transaction logs
    const message = transactionResponse.meta.logMessages.find((log) =>
        log.includes("Hi from Solana!")
    );
  
    if (message) {
        console.log("Message:", message);
    } else {
        console.error("Failed to retrieve message");
    }
  }
  
  // Call the function to interact with the Solana program
  callGetMessage().catch((error) => {
    console.error("Error:", error);
  });