[TieredAccountStorage] TieredReadableAccount (#32380)
#### Summary of Changes This PR introduces TieredReadableAccount, a struct that takes a generic TieredAccountMeta that implements ReadableAccount and support StoredAccountMeta. #### Test Plan More tests will be added once more reader and writer functions for hot accounts have been added.
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@ -5,6 +5,7 @@ pub mod footer;
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pub mod hot;
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pub mod meta;
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pub mod mmap_utils;
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pub mod readable;
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use crate::tiered_storage::error::TieredStorageError;
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@ -0,0 +1,78 @@
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use {
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crate::{
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account_storage::meta::StoredMetaWriteVersion, tiered_storage::meta::TieredAccountMeta,
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},
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solana_sdk::{account::ReadableAccount, hash::Hash, pubkey::Pubkey, stake_history::Epoch},
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};
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/// The struct that offers read APIs for accessing a TieredAccount.
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#[derive(PartialEq, Eq, Debug)]
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pub struct TieredReadableAccount<'a, M: TieredAccountMeta> {
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/// TieredAccountMeta
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pub(crate) meta: &'a M,
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/// The address of the account
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pub(crate) address: &'a Pubkey,
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/// The address of the account owner
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pub(crate) owner: &'a Pubkey,
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/// The index for accessing the account inside its belonging AccountsFile
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pub(crate) index: usize,
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/// The account block that contains this account. Note that this account
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/// block may be shared with other accounts.
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pub(crate) account_block: &'a [u8],
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}
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impl<'a, M: TieredAccountMeta> TieredReadableAccount<'a, M> {
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/// Returns the address of this account.
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pub fn address(&self) -> &'a Pubkey {
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self.address
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}
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/// Returns the hash of this account.
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pub fn hash(&self) -> Option<&'a Hash> {
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self.meta.account_hash(self.account_block)
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}
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/// Returns the index to this account in its AccountsFile.
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pub fn index(&self) -> usize {
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self.index
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}
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/// Returns the write version of the account.
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pub fn write_version(&self) -> Option<StoredMetaWriteVersion> {
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self.meta.write_version(self.account_block)
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}
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}
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impl<'a, M: TieredAccountMeta> ReadableAccount for TieredReadableAccount<'a, M> {
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/// Returns the balance of the lamports of this account.
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fn lamports(&self) -> u64 {
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self.meta.lamports()
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}
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/// Returns the address of the owner of this account.
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fn owner(&self) -> &'a Pubkey {
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self.owner
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}
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/// Returns true if the data associated to this account is executable.
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///
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/// Temporarily unimplemented!() as program runtime v2 will use
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/// a different API for executable.
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fn executable(&self) -> bool {
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unimplemented!();
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}
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/// Returns the epoch that this account will next owe rent by parsing
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/// the specified account block. Epoch::MAX will be returned if the account
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/// is rent-exempt.
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fn rent_epoch(&self) -> Epoch {
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self.meta
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.rent_epoch(self.account_block)
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.unwrap_or(Epoch::MAX)
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}
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/// Returns the data associated to this account.
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fn data(&self) -> &'a [u8] {
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self.meta.account_data(self.account_block)
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}
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}
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