hayabusa-token 0.1.0

Hayabusa Token program interface
Documentation 
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// Copyright (c) 2025, Arcane Labs <dev@arcane.fi>
// SPDX-License-Identifier: Apache-2.0

use crate::{write_bytes, UNINIT_BYTE};
use core::slice::from_raw_parts;
use hayabusa_cpi::{CpiCtx, CheckProgramId};
use hayabusa_errors::Result;
use pinocchio::{account_info::AccountInfo, cpi::{invoke, invoke_signed}, instruction::{AccountMeta, Instruction}, pubkey::Pubkey};

pub struct Transfer<'a> {
    /// Funding account
    pub from: &'a AccountInfo,
    /// Recipient account
    pub to: &'a AccountInfo,
    /// Authority account
    pub authority: &'a AccountInfo,
}

impl CheckProgramId for Transfer<'_> {
    const ID: Pubkey = crate::ID;
}

const DISCRIMINATOR: [u8; 1] = [3];

#[inline(always)]
pub fn transfer<'a>(
    cpi_ctx: CpiCtx<'a, '_, '_, '_, Transfer<'a>>,
    amount: u64,
) -> Result<()> {
    let infos = [
        cpi_ctx.from,
        cpi_ctx.to,
        cpi_ctx.authority,
    ];

    let metas = [
        AccountMeta::writable(cpi_ctx.from.key()),
        AccountMeta::writable(cpi_ctx.to.key()),
        AccountMeta::readonly_signer(cpi_ctx.authority.key()),
    ];

    // ix data layout
    // - [0]: discriminator
    // - [1..9]: amount
    let mut ix_data = [UNINIT_BYTE; 9];

    write_bytes(&mut ix_data, &DISCRIMINATOR);
    write_bytes(&mut ix_data[1..9], &amount.to_le_bytes());

    let instruction = Instruction {
        program_id: &crate::ID,
        accounts: &metas,
        data: unsafe { from_raw_parts(ix_data.as_ptr() as _, 9) },
    };

    if let Some(signers) = cpi_ctx.signers {
        invoke_signed(&instruction, &infos, signers)
    } else {
        invoke(&instruction, &infos)
    }
}