46 lines
1.6 KiB
Rust
46 lines
1.6 KiB
Rust
//! Program instruction processor
|
|
|
|
use solana_program::{
|
|
account_info::{next_account_info, AccountInfo},
|
|
entrypoint::ProgramResult,
|
|
msg,
|
|
pubkey::Pubkey,
|
|
sysvar::{clock::Clock, rent::Rent, Sysvar},
|
|
};
|
|
|
|
/// Instruction processor
|
|
pub fn process_instruction(
|
|
_program_id: &Pubkey,
|
|
accounts: &[AccountInfo],
|
|
_instruction_data: &[u8],
|
|
) -> ProgramResult {
|
|
// Create in iterator to safety reference accounts in the slice
|
|
let account_info_iter = &mut accounts.iter();
|
|
|
|
// Get the clock sysvar via syscall
|
|
let clock_via_sysvar = Clock::get()?;
|
|
// Or deserialize the account into a clock struct
|
|
let clock_sysvar_info = next_account_info(account_info_iter)?;
|
|
let clock_via_account = Clock::from_account_info(clock_sysvar_info)?;
|
|
// Both produce the same sysvar
|
|
assert_eq!(clock_via_sysvar, clock_via_account);
|
|
// Note: `format!` can be very expensive, use cautiously
|
|
msg!("{:?}", clock_via_sysvar);
|
|
|
|
// Get the rent sysvar via syscall
|
|
let rent_via_sysvar = Rent::get()?;
|
|
// Or deserialize the account into a rent struct
|
|
let rent_sysvar_info = next_account_info(account_info_iter)?;
|
|
let rent_via_account = Rent::from_account_info(rent_sysvar_info)?;
|
|
// Both produce the same sysvar
|
|
assert_eq!(rent_via_sysvar, rent_via_account);
|
|
// Can't print `exemption_threshold` because BPF does not support printing floats
|
|
msg!(
|
|
"Rent: lamports_per_byte_year: {:?}, burn_percent: {:?}",
|
|
rent_via_sysvar.lamports_per_byte_year,
|
|
rent_via_sysvar.burn_percent
|
|
);
|
|
|
|
Ok(())
|
|
}
|