Function create_transfer_checked_instruction_with_extra_metas

pub async fn create_transfer_checked_instruction_with_extra_metas<F, Fut>(
    token_program_id: &Pubkey,
    source_pubkey: &Pubkey,
    mint_pubkey: &Pubkey,
    destination_pubkey: &Pubkey,
    authority_pubkey: &Pubkey,
    signer_pubkeys: &[&Pubkey],
    amount: u64,
    decimals: u8,
    fetch_account_data_fn: F,
) -> Result<Instruction, AccountFetchError>
where
    F: Fn(Pubkey) -> Fut,
    Fut: Future<Output = AccountDataResult>,

Offchain helper to create a TransferChecked instruction with all additional required account metas for a transfer, including the ones required by the transfer hook.

To be client-agnostic and to avoid pulling in the full solana-sdk, this simply takes a function that will return its data as Future<Vec<u8>> for the given address. Can be called in the following way:

let instruction = create_transfer_checked_instruction_with_extra_metas(
    &spl_token_2022::id(),
    &source,
    &mint,
    &destination,
    &authority,
    &[],
    amount,
    decimals,
    |address| self.client.get_account(&address).map_ok(|opt| opt.map(|acc| acc.data)),
)
.await?