43 lines
1.0 KiB
Rust
43 lines
1.0 KiB
Rust
//! This account contains the current cluster rent
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//!
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pub use crate::rent::Rent;
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use crate::{
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account::{Account, KeyedAccount},
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instruction::InstructionError,
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sysvar::Sysvar,
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};
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crate::declare_sysvar_id!("SysvarRent111111111111111111111111111111111", Rent);
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impl Sysvar for Rent {}
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pub fn create_account(lamports: u64, rent: &Rent) -> Account {
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rent.create_account(lamports)
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}
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pub fn verify_rent_exemption(
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keyed_account: &KeyedAccount,
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rent_sysvar_account: &KeyedAccount,
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) -> Result<(), InstructionError> {
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let rent = Rent::from_keyed_account(rent_sysvar_account)?;
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if !rent.is_exempt(keyed_account.lamports()?, keyed_account.data_len()?) {
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Err(InstructionError::InsufficientFunds)
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} else {
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_rent_create_account() {
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let lamports = 42;
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let account = create_account(lamports, &Rent::default());
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let rent = Rent::from_account(&account).unwrap();
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assert_eq!(rent, Rent::default());
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}
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}
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