Trait DbReader 

pub trait DbReader: Send + Sync {
    // Required methods
    fn get_epoch_ending_ledger_infos(
        &self,
        start_epoch: u64,
        end_epoch: u64,
    ) -> Result<EpochChangeProof>;
    fn get_block_timestamp(&self, version: u64) -> Result<u64>;
    fn get_latest_ledger_info(&self) -> Result<LedgerInfoWithSignatures>;
    fn get_startup_info(
        &self,
        need_pos_state: bool,
    ) -> Result<Option<StartupInfo>>;
    fn get_latest_tree_state(&self) -> Result<TreeState>;
    fn get_epoch_ending_ledger_info(
        &self,
        known_version: u64,
    ) -> Result<LedgerInfoWithSignatures>;

    // Provided methods
    fn get_latest_version(&self) -> Result<Version> { ... }
    fn get_latest_commit_metadata(&self) -> Result<(Version, u64)> { ... }
    fn get_latest_transaction_info_option(
        &self,
    ) -> Result<Option<(Version, TransactionInfo)>> { ... }
    fn get_pos_state(&self, _block_id: &HashValue) -> Result<PosState> { ... }
    fn get_latest_pos_state(&self) -> Arc<PosState> { ... }
}

Trait that is implemented by a DB that supports certain public (to client) read APIs expected of a Diem DB

Required Methods

fn get_epoch_ending_ledger_infos( &self, start_epoch: u64, end_epoch: u64, ) -> Result<EpochChangeProof>

See DiemDB::get_epoch_ending_ledger_infos.

fn get_block_timestamp(&self, version: u64) -> Result<u64>

See DiemDB::get_block_timestamp.

fn get_latest_ledger_info(&self) -> Result<LedgerInfoWithSignatures>

Returns the latest ledger info.

fn get_startup_info(&self, need_pos_state: bool) -> Result<Option<StartupInfo>>

Gets information needed from storage during the main node startup. See DiemDB::get_startup_info.

fn get_latest_tree_state(&self) -> Result<TreeState>

Gets the latest TreeState no matter if db has been bootstrapped. Used by the Db-bootstrapper.

fn get_epoch_ending_ledger_info( &self, known_version: u64, ) -> Result<LedgerInfoWithSignatures>

Get the ledger info of the epoch that known_version belongs to.

Provided Methods

fn get_latest_version(&self) -> Result<Version>

Returns the latest ledger info.

fn get_latest_commit_metadata(&self) -> Result<(Version, u64)>

Returns the latest version and committed block timestamp

fn get_latest_transaction_info_option( &self, ) -> Result<Option<(Version, TransactionInfo)>>

Gets the latest transaction info. N.B. Unlike get_startup_info(), even if the db is not bootstrapped, this can return Some – those from a db-restore run.

fn get_pos_state(&self, _block_id: &HashValue) -> Result<PosState>

fn get_latest_pos_state(&self) -> Arc<PosState>

Implementors