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use pinocchio::{
account_info::AccountInfo,
instruction::{AccountMeta, Instruction, Signer},
program::invoke_signed,
pubkey::Pubkey,
ProgramResult,
};
/// Allocate space for and assign an account at an address derived
/// from a base public key and a seed.
///
/// ### Accounts:
/// 0. `[WRITE]` Allocated account
/// 1. `[SIGNER]` Base account
pub struct AllocateWithSeed<'a, 'b, 'c> {
/// Allocated account.
pub account: &'a AccountInfo,
/// Base account.
///
/// The account matching the base Pubkey below must be provided as
/// a signer, but may be the same as the funding account and provided
/// as account 0.
pub base: &'a AccountInfo,
/// String of ASCII chars, no longer than `Pubkey::MAX_SEED_LEN`.
pub seed: &'b str,
/// Number of bytes of memory to allocate.
pub space: u64,
/// Address of program that will own the new account.
pub owner: &'c Pubkey,
}
impl AllocateWithSeed<'_, '_, '_> {
#[inline(always)]
pub fn invoke(&self) -> ProgramResult {
self.invoke_signed(&[])
}
pub fn invoke_signed(&self, signers: &[Signer]) -> ProgramResult {
// account metadata
let account_metas: [AccountMeta; 2] = [
AccountMeta::writable_signer(self.account.key()),
AccountMeta::readonly_signer(self.base.key()),
];
// instruction data
// - [0..4 ]: instruction discriminator
// - [4..36 ]: base pubkey
// - [36..40]: seed length
// - [40.. ]: seed (max 32)
// - [.. +8]: account space
// - [.. +32]: owner pubkey
let mut instruction_data = [0; 112];
instruction_data[0] = 9;
instruction_data[4..36].copy_from_slice(self.base.key());
instruction_data[36..40].copy_from_slice(&u32::to_le_bytes(self.seed.len() as u32));
let offset = 40 + self.seed.len();
instruction_data[40..offset].copy_from_slice(self.seed.as_bytes());
instruction_data[offset..offset + 8].copy_from_slice(&self.space.to_le_bytes());
instruction_data[offset + 8..offset + 40].copy_from_slice(self.owner.as_ref());
let instruction = Instruction {
program_id: &crate::ID,
accounts: &account_metas,
data: &instruction_data[..offset + 40],
};
invoke_signed(&instruction, &[self.account, self.base], signers)
}
}