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Rent sysvar example #6

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Rent sysvar example #6

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24 changes: 21 additions & 3 deletions src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,11 @@
use solana_program::{
account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, msg, pubkey::Pubkey,
account_info::{next_account_info, AccountInfo},
entrypoint,
entrypoint::ProgramResult,
msg,
pubkey::Pubkey,
rent::Rent,
sysvar::Sysvar,
};

entrypoint!(process_instruction);
Expand All @@ -14,6 +20,15 @@ fn process_instruction(
accounts.len(),
instruction_data
);

let account_info_iter = &mut accounts.iter();
let rent_sysvar_account_info = next_account_info(account_info_iter)?;
let rent = &Rent::from_account_info(rent_sysvar_account_info)?;
msg!(
"Rent exemption minimum lamport balance for an account that's 123 bytes in size: {}",
rent.minimum_balance(123)
);

Ok(())
}

Expand All @@ -22,7 +37,10 @@ mod test {
use {
super::*,
assert_matches::*,
solana_program::instruction::{AccountMeta, Instruction},
solana_program::{
instruction::{AccountMeta, Instruction},
sysvar,
},
solana_program_test::*,
solana_sdk::{signature::Signer, transaction::Transaction},
};
Expand All @@ -42,7 +60,7 @@ mod test {
let mut transaction = Transaction::new_with_payer(
&[Instruction {
program_id,
accounts: vec![AccountMeta::new(payer.pubkey(), false)],
accounts: vec![AccountMeta::new_readonly(sysvar::rent::id(), false)],
data: vec![1, 2, 3],
}],
Some(&payer.pubkey()),
Expand Down
3 changes: 2 additions & 1 deletion tests/integration.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ use {
solana_program::{
instruction::{AccountMeta, Instruction},
pubkey::Pubkey,
sysvar,
},
solana_sdk::{signature::Signer, transaction::Transaction},
solana_validator::test_validator::*,
Expand All @@ -22,7 +23,7 @@ fn test_validator_transaction() {
let mut transaction = Transaction::new_with_payer(
&[Instruction {
program_id,
accounts: vec![AccountMeta::new(payer.pubkey(), false)],
accounts: vec![AccountMeta::new_readonly(sysvar::rent::id(), false)],
data: vec![1, 2, 3],
}],
Some(&payer.pubkey()),
Expand Down