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use crate::{
account::{Account, KeyedAccount},
account_info::AccountInfo,
instruction::InstructionError,
rent_calculator::RentCalculator,
sysvar,
};
use bincode::serialized_size;
const ID: [u8; 32] = [
6, 167, 213, 23, 25, 44, 92, 81, 33, 140, 201, 76, 61, 74, 241, 127, 88, 218, 238, 8, 155, 161,
253, 68, 227, 219, 217, 138, 0, 0, 0, 0,
];
crate::solana_sysvar_id!(ID, "SysvarRent111111111111111111111111111111111");
#[repr(C)]
#[derive(Serialize, Deserialize, Debug, Default)]
pub struct Rent {
pub rent_calculator: RentCalculator,
}
impl Rent {
pub fn from_account(account: &Account) -> Option<Self> {
account.deserialize_data().ok()
}
pub fn to_account(&self, account: &mut Account) -> Option<()> {
account.serialize_data(self).ok()
}
pub fn from_account_info(account: &AccountInfo) -> Option<Self> {
account.deserialize_data().ok()
}
pub fn to_account_info(&self, account: &mut AccountInfo) -> Option<()> {
account.serialize_data(self).ok()
}
pub fn size_of() -> usize {
serialized_size(&Rent::default()).unwrap() as usize
}
}
pub fn create_account(lamports: u64, rent_calculator: &RentCalculator) -> Account {
Account::new_data(
lamports,
&Rent {
rent_calculator: *rent_calculator,
},
&sysvar::id(),
)
.unwrap()
}
pub fn from_keyed_account(account: &KeyedAccount) -> Result<Rent, InstructionError> {
if !check_id(account.unsigned_key()) {
return Err(InstructionError::InvalidArgument);
}
Rent::from_account(account.account).ok_or(InstructionError::InvalidArgument)
}
pub fn verify_rent_exemption(
account: &KeyedAccount,
rent_sysvar_account: &KeyedAccount,
) -> Result<(), InstructionError> {
if !from_keyed_account(rent_sysvar_account)?
.rent_calculator
.is_exempt(account.account.lamports, account.account.data.len())
{
Err(InstructionError::InsufficientFunds)
} else {
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_rent_create_account() {
let lamports = 42;
let account = create_account(lamports, &RentCalculator::default());
let rent = Rent::from_account(&account).unwrap();
assert_eq!(rent.rent_calculator, RentCalculator::default());
}
}