312 lines
9.7 KiB
Rust
312 lines
9.7 KiB
Rust
use std::cell::{Ref, RefMut};
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use std::marker::PhantomData;
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use std::mem::size_of;
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use anchor_lang::prelude::*;
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use anchor_lang::Discriminator;
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use arrayref::array_ref;
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// Header is created by scanning and parsing dynamic portion of the account
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// Header stores useful information e.g. offsets to easily seek into dynamic content
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pub trait DynamicHeader: Sized {
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// build header by scanning and parsing dynamic portion of the account
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fn from_bytes(data: &[u8]) -> Result<Self>;
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// initialize a header on a new account, if necessary
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fn initialize(data: &mut [u8]) -> Result<()>;
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}
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pub trait DynamicAccountType: Owner + Discriminator {
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type Header: DynamicHeader;
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type Fixed: bytemuck::Pod;
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}
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#[derive(Clone)]
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pub struct DynamicAccount<Header, Fixed, Dynamic> {
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pub header: Header,
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pub fixed: Fixed,
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pub dynamic: Dynamic,
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}
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pub type DynamicAccountValue<D> =
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DynamicAccount<<D as DynamicAccountType>::Header, <D as DynamicAccountType>::Fixed, Vec<u8>>;
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pub type DynamicAccountRef<'a, D> = DynamicAccount<
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&'a <D as DynamicAccountType>::Header,
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&'a <D as DynamicAccountType>::Fixed,
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&'a [u8],
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>;
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pub type DynamicAccountRefMut<'a, D> = DynamicAccount<
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&'a mut <D as DynamicAccountType>::Header,
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&'a mut <D as DynamicAccountType>::Fixed,
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&'a mut [u8],
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>;
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// Want to generalize over:
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// - T (which is Borrow<T>)
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// - &T (which is Borrow<T> and Deref<Target=T>)
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// - Ref<T> (which is Deref<T>)
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pub trait DerefOrBorrow<T: ?Sized> {
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fn deref_or_borrow(&self) -> &T;
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}
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impl<T: ?Sized> DerefOrBorrow<T> for T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrow<T> for &T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<T: Sized> DerefOrBorrow<[T]> for Vec<T> {
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fn deref_or_borrow(&self) -> &[T] {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrow<T> for &mut T {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrow<T> for Ref<'a, T> {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrow<T> for RefMut<'a, T> {
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fn deref_or_borrow(&self) -> &T {
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self
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}
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}
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pub trait DerefOrBorrowMut<T: ?Sized> {
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fn deref_or_borrow_mut(&mut self) -> &mut T;
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}
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impl<T: ?Sized> DerefOrBorrowMut<T> for T {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<T: ?Sized> DerefOrBorrowMut<T> for &mut T {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<'a, T: ?Sized> DerefOrBorrowMut<T> for RefMut<'a, T> {
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fn deref_or_borrow_mut(&mut self) -> &mut T {
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self
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}
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}
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impl<T: Sized> DerefOrBorrowMut<[T]> for Vec<T> {
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fn deref_or_borrow_mut(&mut self) -> &mut [T] {
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self
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}
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}
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pub struct AccountLoaderDynamic<'info, D: DynamicAccountType> {
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/// CHECK: is checked below
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acc_info: AccountInfo<'info>,
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phantom1: PhantomData<&'info D>,
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}
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impl<'info, D: DynamicAccountType> AccountLoaderDynamic<'info, D> {
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pub fn try_from(acc_info: &AccountInfo<'info>) -> Result<Self> {
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if acc_info.owner != &D::owner() {
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return Err(Error::from(ErrorCode::AccountOwnedByWrongProgram)
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.with_pubkeys((*acc_info.owner, D::owner())));
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}
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let data = acc_info.try_borrow_data()?;
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if data.len() < D::discriminator().len() {
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return Err(ErrorCode::AccountDiscriminatorNotFound.into());
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}
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let disc_bytes = array_ref![data, 0, 8];
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if disc_bytes != &D::discriminator() {
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return Err(ErrorCode::AccountDiscriminatorMismatch.into());
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}
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Ok(Self {
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acc_info: acc_info.clone(),
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phantom1: PhantomData,
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})
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}
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pub fn try_from_unchecked(acc_info: &AccountInfo<'info>) -> Result<Self> {
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if acc_info.owner != &D::owner() {
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return Err(Error::from(ErrorCode::AccountOwnedByWrongProgram)
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.with_pubkeys((*acc_info.owner, D::owner())));
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}
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Ok(Self {
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acc_info: acc_info.clone(),
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phantom1: PhantomData,
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})
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}
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/// Returns a Ref to the account data structure for reading.
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pub fn load_fixed(&self) -> Result<Ref<D::Fixed>> {
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let data = self.acc_info.try_borrow_data()?;
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let fixed = Ref::map(data, |d| {
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bytemuck::from_bytes(&d[8..8 + size_of::<D::Fixed>()])
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});
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Ok(fixed)
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}
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#[allow(clippy::type_complexity)]
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/// Returns a Ref to the account data structure for reading.
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pub fn load(&self) -> Result<DynamicAccount<D::Header, Ref<D::Fixed>, Ref<[u8]>>> {
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let data = self.acc_info.try_borrow_data()?;
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let header = D::Header::from_bytes(&data[8 + size_of::<D::Fixed>()..])?;
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let (_, data) = Ref::map_split(data, |d| d.split_at(8));
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let (fixed_bytes, dynamic) = Ref::map_split(data, |d| d.split_at(size_of::<D::Fixed>()));
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Ok(DynamicAccount {
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header,
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fixed: Ref::map(fixed_bytes, |b| bytemuck::from_bytes(b)),
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dynamic,
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})
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}
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#[allow(clippy::type_complexity)]
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pub fn load_init(&self) -> Result<DynamicAccount<D::Header, RefMut<D::Fixed>, RefMut<[u8]>>> {
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if !self.acc_info.is_writable {
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return Err(ErrorCode::AccountNotMutable.into());
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}
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let mut data = self.acc_info.try_borrow_mut_data()?;
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let mut disc_bytes = [0u8; 8];
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disc_bytes.copy_from_slice(&data[..8]);
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let discriminator = u64::from_le_bytes(disc_bytes);
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if discriminator != 0 {
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return Err(ErrorCode::AccountDiscriminatorAlreadySet.into());
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}
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let disc_bytes: &mut [u8] = &mut data[0..8];
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disc_bytes.copy_from_slice(bytemuck::bytes_of(&(D::discriminator())));
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D::Header::initialize(&mut data[8 + size_of::<D::Fixed>()..])?;
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drop(data);
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self.load_mut()
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}
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/// Returns a Ref to the account data structure for reading.
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#[allow(clippy::type_complexity)]
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pub fn load_mut(&self) -> Result<DynamicAccount<D::Header, RefMut<D::Fixed>, RefMut<[u8]>>> {
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if !self.acc_info.is_writable {
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return Err(ErrorCode::AccountNotMutable.into());
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}
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let data = self.acc_info.try_borrow_mut_data()?;
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let header = D::Header::from_bytes(&data[8 + size_of::<D::Fixed>()..])?;
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let (_, data) = RefMut::map_split(data, |d| d.split_at_mut(8));
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let (fixed_bytes, dynamic) =
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RefMut::map_split(data, |d| d.split_at_mut(size_of::<D::Fixed>()));
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Ok(DynamicAccount {
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header,
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fixed: RefMut::map(fixed_bytes, |b| bytemuck::from_bytes_mut(b)),
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dynamic,
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})
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::Accounts<'info> for AccountLoaderDynamic<'info, D> {
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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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_bumps: &mut std::collections::BTreeMap<String, u8>,
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_reallocs: &mut std::collections::BTreeSet<Pubkey>,
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) -> Result<Self> {
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if accounts.is_empty() {
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return Err(ErrorCode::AccountNotEnoughKeys.into());
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}
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let account = &accounts[0];
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*accounts = &accounts[1..];
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let l = AccountLoaderDynamic::try_from(account)?;
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Ok(l)
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::AccountsExit<'info>
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for AccountLoaderDynamic<'info, D>
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{
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fn exit(&self, _program_id: &Pubkey) -> Result<()> {
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// Normally anchor writes the discriminator again here, but I don't see why
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let data = self.acc_info.try_borrow_data()?;
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if data.len() < D::discriminator().len() {
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return Err(ErrorCode::AccountDiscriminatorNotFound.into());
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}
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let disc_bytes = array_ref![data, 0, 8];
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if disc_bytes != &D::discriminator() {
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return Err(ErrorCode::AccountDiscriminatorMismatch.into());
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}
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Ok(())
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::AccountsClose<'info>
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for AccountLoaderDynamic<'info, D>
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{
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fn close(&self, sol_destination: AccountInfo<'info>) -> Result<()> {
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close(self.to_account_info(), sol_destination)
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::ToAccountMetas for AccountLoaderDynamic<'info, D> {
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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.acc_info.is_signer);
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let meta = match self.acc_info.is_writable {
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false => AccountMeta::new_readonly(*self.acc_info.key, is_signer),
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true => AccountMeta::new(*self.acc_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, D: DynamicAccountType> AsRef<AccountInfo<'info>> for AccountLoaderDynamic<'info, D> {
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fn as_ref(&self) -> &AccountInfo<'info> {
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&self.acc_info
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::ToAccountInfos<'info>
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for AccountLoaderDynamic<'info, D>
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{
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fn to_account_infos(&self) -> Vec<AccountInfo<'info>> {
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vec![self.acc_info.clone()]
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}
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}
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impl<'info, D: DynamicAccountType> anchor_lang::Key for AccountLoaderDynamic<'info, D> {
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fn key(&self) -> Pubkey {
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*self.acc_info.key
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}
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}
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// https://github.com/coral-xyz/anchor/blob/master/lang/src/common.rs#L8
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fn close<'info>(info: AccountInfo<'info>, sol_destination: AccountInfo<'info>) -> Result<()> {
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// Transfer tokens from the account to the sol_destination.
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let dest_starting_lamports = sol_destination.lamports();
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**sol_destination.lamports.borrow_mut() =
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dest_starting_lamports.checked_add(info.lamports()).unwrap();
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**info.lamports.borrow_mut() = 0;
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// Mark the account discriminator as closed.
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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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dst[0..8].copy_from_slice(&[255, 255, 255, 255, 255, 255, 255, 255]);
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Ok(())
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}
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