2021-06-09 13:02:50 -07:00
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use crate::error::ErrorCode;
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2021-01-22 03:35:57 -08:00
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use crate::{
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2021-01-27 19:58:26 -08:00
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AccountDeserialize, AccountSerialize, Accounts, AccountsExit, CpiAccount, ToAccountInfo,
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ToAccountInfos, ToAccountMetas,
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2021-01-22 03:35:57 -08:00
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};
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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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2021-06-27 17:09:46 -07:00
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pub const PROGRAM_STATE_SEED: &str = "unversioned";
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2021-04-18 09:54:18 -07:00
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2021-01-22 03:35:57 -08:00
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/// Boxed container for the program state singleton.
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#[derive(Clone)]
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pub struct ProgramState<'info, T: AccountSerialize + AccountDeserialize + Clone> {
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inner: Box<Inner<'info, T>>,
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}
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#[derive(Clone)]
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struct Inner<'info, T: AccountSerialize + AccountDeserialize + Clone> {
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info: AccountInfo<'info>,
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account: T,
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}
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impl<'a, T: AccountSerialize + AccountDeserialize + Clone> ProgramState<'a, T> {
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pub fn new(info: AccountInfo<'a>, account: T) -> ProgramState<'a, T> {
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Self {
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inner: Box::new(Inner { info, account }),
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}
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}
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/// Deserializes the given `info` into a `ProgramState`.
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#[inline(never)]
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pub fn try_from(info: &AccountInfo<'a>) -> Result<ProgramState<'a, T>, ProgramError> {
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let mut data: &[u8] = &info.try_borrow_data()?;
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Ok(ProgramState::new(
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info.clone(),
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T::try_deserialize(&mut data)?,
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))
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}
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pub fn seed() -> &'static str {
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PROGRAM_STATE_SEED
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}
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pub fn address(program_id: &Pubkey) -> Pubkey {
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address(program_id)
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2021-01-22 03:35:57 -08:00
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}
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}
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impl<'info, T> Accounts<'info> for ProgramState<'info, T>
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where
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T: AccountSerialize + AccountDeserialize + Clone,
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{
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#[inline(never)]
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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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_ix_data: &[u8],
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) -> Result<Self, ProgramError> {
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2021-02-15 21:52:54 -08:00
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if accounts.is_empty() {
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return Err(ErrorCode::AccountNotEnoughKeys.into());
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2021-01-22 03:35:57 -08:00
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}
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let account = &accounts[0];
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*accounts = &accounts[1..];
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if account.key != &Self::address(program_id) {
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2021-04-13 11:47:54 -07:00
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solana_program::msg!("Invalid state address");
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2021-06-09 13:02:50 -07:00
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return Err(ErrorCode::StateInvalidAddress.into());
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}
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let pa = ProgramState::try_from(account)?;
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if pa.inner.info.owner != program_id {
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solana_program::msg!("Invalid state owner");
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return Err(ErrorCode::AccountNotProgramOwned.into());
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}
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Ok(pa)
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}
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}
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impl<'info, T: AccountSerialize + AccountDeserialize + Clone> ToAccountMetas
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for ProgramState<'info, T>
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{
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fn to_account_metas(&self, is_signer: Option<bool>) -> Vec<AccountMeta> {
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let is_signer = is_signer.unwrap_or(self.inner.info.is_signer);
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let meta = match self.inner.info.is_writable {
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false => AccountMeta::new_readonly(*self.inner.info.key, is_signer),
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true => AccountMeta::new(*self.inner.info.key, is_signer),
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};
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vec![meta]
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}
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}
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impl<'info, T: AccountSerialize + AccountDeserialize + Clone> ToAccountInfos<'info>
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for ProgramState<'info, T>
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{
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fn to_account_infos(&self) -> Vec<AccountInfo<'info>> {
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vec![self.inner.info.clone()]
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}
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}
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impl<'info, T: AccountSerialize + AccountDeserialize + Clone> ToAccountInfo<'info>
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for ProgramState<'info, T>
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{
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fn to_account_info(&self) -> AccountInfo<'info> {
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self.inner.info.clone()
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}
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}
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impl<'a, T: AccountSerialize + AccountDeserialize + Clone> Deref for ProgramState<'a, T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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&(*self.inner).account
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}
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}
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impl<'a, T: AccountSerialize + AccountDeserialize + Clone> DerefMut for ProgramState<'a, T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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&mut DerefMut::deref_mut(&mut self.inner).account
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}
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}
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impl<'info, T> From<CpiAccount<'info, T>> for ProgramState<'info, T>
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where
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T: AccountSerialize + AccountDeserialize + Clone,
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{
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fn from(a: CpiAccount<'info, T>) -> Self {
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Self::new(a.to_account_info(), Deref::deref(&a).clone())
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}
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}
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impl<'info, T: AccountSerialize + AccountDeserialize + Clone> AccountsExit<'info>
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for ProgramState<'info, T>
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{
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fn exit(&self, _program_id: &Pubkey) -> ProgramResult {
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let info = self.to_account_info();
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let mut data = info.try_borrow_mut_data()?;
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let dst: &mut [u8] = &mut data;
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let mut cursor = std::io::Cursor::new(dst);
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self.inner.account.try_serialize(&mut cursor)?;
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Ok(())
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}
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}
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2021-05-06 14:48:22 -07:00
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pub fn address(program_id: &Pubkey) -> Pubkey {
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let (base, _nonce) = Pubkey::find_program_address(&[], program_id);
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let seed = PROGRAM_STATE_SEED;
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let owner = program_id;
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Pubkey::create_with_seed(&base, seed, owner).unwrap()
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}
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