87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
use crate::{Accounts, AccountsExit, ToAccountInfo, ToAccountInfos, ToAccountMetas};
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use solana_program::account_info::AccountInfo;
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use solana_program::entrypoint::ProgramResult;
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use solana_program::instruction::AccountMeta;
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use solana_program::program_error::ProgramError;
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use solana_program::pubkey::Pubkey;
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use std::ops::{Deref, DerefMut};
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/// Container for sysvars.
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pub struct Sysvar<'info, T: solana_program::sysvar::Sysvar> {
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info: AccountInfo<'info>,
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account: T,
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}
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impl<'info, T: solana_program::sysvar::Sysvar> Sysvar<'info, T> {
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pub fn from_account_info(
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acc_info: &AccountInfo<'info>,
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) -> Result<Sysvar<'info, T>, ProgramError> {
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Ok(Sysvar {
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info: acc_info.clone(),
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account: T::from_account_info(&acc_info)?,
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})
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> Clone for Sysvar<'info, T> {
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fn clone(&self) -> Self {
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Self {
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info: self.info.clone(),
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account: T::from_account_info(&self.info).unwrap(),
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}
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> Accounts<'info> for Sysvar<'info, T> {
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fn try_accounts(
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_program_id: &Pubkey,
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accounts: &mut &[AccountInfo<'info>],
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) -> Result<Self, ProgramError> {
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if accounts.len() == 0 {
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return Err(ProgramError::NotEnoughAccountKeys);
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}
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let account = &accounts[0];
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*accounts = &accounts[1..];
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Sysvar::from_account_info(account)
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> ToAccountMetas for Sysvar<'info, T> {
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fn to_account_metas(&self, _is_signer: Option<bool>) -> Vec<AccountMeta> {
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vec![AccountMeta::new_readonly(*self.info.key, false)]
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> ToAccountInfos<'info> for Sysvar<'info, T> {
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fn to_account_infos(&self) -> Vec<AccountInfo<'info>> {
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vec![self.info.clone()]
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}
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}
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impl<'a, T: solana_program::sysvar::Sysvar> Deref for Sysvar<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&self.account
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}
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}
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impl<'a, T: solana_program::sysvar::Sysvar> DerefMut for Sysvar<'a, T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut self.account
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> ToAccountInfo<'info> for Sysvar<'info, T> {
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fn to_account_info(&self) -> AccountInfo<'info> {
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self.info.clone()
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}
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}
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impl<'info, T: solana_program::sysvar::Sysvar> AccountsExit<'info> for Sysvar<'info, T> {
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fn exit(&self, _program_id: &Pubkey) -> ProgramResult {
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// no-op
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Ok(())
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}
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}
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