InvalidAccountData Passing a price id to rust pyth-sdk program from typescript client - Pyth

Question

I'm trying to use pyth SDK make a program to fetch a price, then using a typescript client to pass the id of the price feed I want to the program. My rust lib.rs is essentially this:

pub fn process_instruction(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    instruction_data: &[u8]
) -> ProgramResult {
    let account_iter = &mut accounts.iter();
    let price_account_info = next_account_info(account_iter)?;
    msg!("Account key: {}", price_account_info.key.to_string());
    let price_feed: PriceFeed = load_price_feed_from_account_info(&price_account_info).unwrap();
    Ok(())
}

of course I should then use the price feed to actually get the data, but I've limited my code unto the line where I believe the issue lie (and removed here the imports for readability). This has been build and deployed correctly on the devnet.

In typescript (also removing parts for readability) I do this:

const programKeypair = Keypair.fromSecretKey(programSecretKey);
const programPublicKey = programKeypair.publicKey;
const SOLUSDString = 'J83w4HKfqxwcq3BEMMkPFSppX3gqekLyLJBexebFVkix'; // SOL/USD price feed id
const SOLUSDpublicKey = new PublicKey(SOLUSDString);

const transaction = new Transaction();
transaction.add(
  new TransactionInstruction({
    keys: [{pubkey: SOLUSDpublicKey, isSigner: false, isWritable: false}],
    programId: programPublicKey
  }),
);

const payerKeypair = Keypair.fromSecretKey(payerSecretKey);
const connection = new Connection('https://api.devnet.solana.com', 'confirmed');

const txHash = await sendAndConfirmTransaction(
  connection,
  transaction,
  [payerKeypair],
);

I get the following error message:

'Program 4CkxyEHCCr4MTvfyWjc49CyK6mZnsz8FgTUHrJMk4AsA invoke [1]', 'Program log: Account key: J83w4HKfqxwcq3BEMMkPFSppX3gqekLyLJBexebFVkix', "Program log: panicked at 'called Result::unwrap() on an Err value: InvalidAccountData', src/lib.rs:31:88", 'Program 4CkxyEHCCr4MTvfyWjc49CyK6mZnsz8FgTUHrJMk4AsA consumed 14281 of 200000 compute units', 'Program 4CkxyEHCCr4MTvfyWjc49CyK6mZnsz8FgTUHrJMk4AsA failed: SBF program panicked'

notice that lib.rs:31 is indeed the call to load_price_feed_from_account_info(). So, it seems to me that the price id enters my program but somehow the related price account isn't accepted by the function. I think it could be something I specified incorrectly in the "keys" argument of new TransactionInstruction. I've tried to set isWritable to true but the error persists.

Thank you for reading; hope someone can help me.

Answer 1

I made everything again using anchor and it worked. I believe the problem was the lack of serialization.