spl_memo_interface/
instruction.rs

1use {
2    solana_instruction::{AccountMeta, Instruction},
3    solana_pubkey::Pubkey,
4};
5
6/// Build a memo instruction, possibly signed
7///
8/// Accounts expected by this instruction:
9///
10///   0. `..0+N` `[signer]` Expected signers; if zero provided, instruction will
11///      be processed as a normal, unsigned spl-memo
12pub fn build_memo(program_id: &Pubkey, memo: &[u8], signer_pubkeys: &[&Pubkey]) -> Instruction {
13    Instruction {
14        program_id: *program_id,
15        accounts: signer_pubkeys
16            .iter()
17            .map(|&pubkey| AccountMeta::new_readonly(*pubkey, true))
18            .collect(),
19        data: memo.to_vec(),
20    }
21}
22
23#[cfg(test)]
24mod tests {
25    use super::*;
26
27    #[test]
28    fn test_build_memo() {
29        let program_id = Pubkey::new_unique();
30        let signer_pubkey = Pubkey::new_unique();
31        let memo = "🐆".as_bytes();
32        let instruction = build_memo(&program_id, memo, &[&signer_pubkey]);
33        assert_eq!(memo, instruction.data);
34        assert_eq!(instruction.accounts.len(), 1);
35        assert_eq!(instruction.accounts[0].pubkey, signer_pubkey);
36    }
37}
spl_memo_interface/instruction.rs

spl_memo_interface/
instruction.rs
