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use crate::error::ErrorCode;
use crate::{Accounts, AccountsExit, Key, Result, ToAccountInfos, ToAccountMetas};
use solana_program::account_info::AccountInfo;
use solana_program::instruction::AccountMeta;
use solana_program::pubkey::Pubkey;
use std::collections::{BTreeMap, BTreeSet};
use std::fmt;
use std::ops::{Deref, DerefMut};
pub struct Sysvar<'info, T: solana_program::sysvar::Sysvar> {
info: AccountInfo<'info>,
account: T,
}
impl<'info, T: solana_program::sysvar::Sysvar + fmt::Debug> fmt::Debug for Sysvar<'info, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Sysvar")
.field("info", &self.info)
.field("account", &self.account)
.finish()
}
}
impl<'info, T: solana_program::sysvar::Sysvar> Sysvar<'info, T> {
pub fn from_account_info(acc_info: &AccountInfo<'info>) -> Result<Sysvar<'info, T>> {
match T::from_account_info(acc_info) {
Ok(val) => Ok(Sysvar {
info: acc_info.clone(),
account: val,
}),
Err(_) => Err(ErrorCode::AccountSysvarMismatch.into()),
}
}
}
impl<'info, T: solana_program::sysvar::Sysvar> Clone for Sysvar<'info, T> {
fn clone(&self) -> Self {
Self {
info: self.info.clone(),
account: T::from_account_info(&self.info).unwrap(),
}
}
}
impl<'info, T: solana_program::sysvar::Sysvar> Accounts<'info> for Sysvar<'info, T> {
fn try_accounts(
_program_id: &Pubkey,
accounts: &mut &[AccountInfo<'info>],
_ix_data: &[u8],
_bumps: &mut BTreeMap<String, u8>,
_reallocs: &mut BTreeSet<Pubkey>,
) -> Result<Self> {
if accounts.is_empty() {
return Err(ErrorCode::AccountNotEnoughKeys.into());
}
let account = &accounts[0];
*accounts = &accounts[1..];
Sysvar::from_account_info(account)
}
}
impl<'info, T: solana_program::sysvar::Sysvar> ToAccountMetas for Sysvar<'info, T> {
fn to_account_metas(&self, _is_signer: Option<bool>) -> Vec<AccountMeta> {
vec![AccountMeta::new_readonly(*self.info.key, false)]
}
}
impl<'info, T: solana_program::sysvar::Sysvar> ToAccountInfos<'info> for Sysvar<'info, T> {
fn to_account_infos(&self) -> Vec<AccountInfo<'info>> {
vec![self.info.clone()]
}
}
impl<'info, T: solana_program::sysvar::Sysvar> AsRef<AccountInfo<'info>> for Sysvar<'info, T> {
fn as_ref(&self) -> &AccountInfo<'info> {
&self.info
}
}
impl<'a, T: solana_program::sysvar::Sysvar> Deref for Sysvar<'a, T> {
type Target = T;
fn deref(&self) -> &Self::Target {
&self.account
}
}
impl<'a, T: solana_program::sysvar::Sysvar> DerefMut for Sysvar<'a, T> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.account
}
}
impl<'info, T: solana_program::sysvar::Sysvar> AccountsExit<'info> for Sysvar<'info, T> {}
impl<'info, T: solana_program::sysvar::Sysvar> Key for Sysvar<'info, T> {
fn key(&self) -> Pubkey {
*self.info.key
}
}