Function spl_token_2022::offchain::resolve_extra_transfer_account_metas

pub async fn resolve_extra_transfer_account_metas<F, Fut>(
    instruction: &mut Instruction,
    fetch_account_data_fn: F,
    mint_address: &Pubkey
) -> Result<(), AccountFetchError>
where
    F: Fn(Pubkey) -> Fut,
    Fut: Future<Output = AccountDataResult>,

Offchain helper to get all additional required account metas for a checked transfer

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:

use futures_util::TryFutureExt;
use solana_client::nonblocking::rpc_client::RpcClient;
use solana_program::pubkey::Pubkey;

let mint = Pubkey::new_unique();
let client = RpcClient::new_mock("succeeds".to_string());
let mut account_metas = vec![];

get_extra_transfer_account_metas(
    &mut account_metas,
    |address| self.client.get_account(&address).map_ok(|opt| opt.map(|acc| acc.data)),
    &mint,
).await?;