Struct Keyless 

pub struct Keyless<E: Storage + Clock + Metrics, V: VariableValue, H: Hasher> { /* private fields */ }

A keyless authenticated database for variable-length data.

Implementations

impl<E: Storage + Clock + Metrics, V: VariableValue, H: Hasher> Keyless<E, V, H>

pub async fn get(&self, loc: Location) -> Result<Option<V>, Error>

Get the value at location loc in the database.

Errors

Returns Error::LocationOutOfBounds if loc >= self.bounds().await.end.

pub const fn last_commit_loc(&self) -> Location

Returns the location of the last commit.

pub async fn get_metadata(&self) -> Result<Option<V>, Error>

Get the metadata associated with the last commit.

pub async fn init(context: E, cfg: Config<V::Cfg>) -> Result<Self, Error>

Returns a Keyless qmdb initialized from cfg. Any uncommitted operations will be discarded and the state of the db will be as of the last committed operation.

pub fn root(&self) -> H::Digest

Return the root of the db.

pub async fn proof( &self, start_loc: Location, max_ops: NonZeroU64, ) -> Result<(Proof<H::Digest>, Vec<Operation<V>>), Error>

Generate and return:

1. a proof of all operations applied to the db in the range starting at (and including) location start_loc, and ending at the first of either:
   • the last operation performed, or
   • the operation max_ops from the start.
2. the operations corresponding to the leaves in this range.

pub async fn historical_proof( &self, op_count: Location, start_loc: Location, max_ops: NonZeroU64, ) -> Result<(Proof<H::Digest>, Vec<Operation<V>>), Error>

Analogous to proof, but with respect to the state of the MMR when it had op_count operations.

Errors

• Returns crate::mmr::Error::LocationOverflow if op_count or start_loc > crate::mmr::MAX_LOCATION.
• Returns crate::mmr::Error::RangeOutOfBounds if start_loc >= op_count or op_count > number of operations.

pub async fn prune(&mut self, loc: Location) -> Result<(), Error>

Prune historical operations prior to loc. This does not affect the db’s root.

Errors

• Returns Error::PruneBeyondMinRequired if loc > last commit point.
• Returns crate::mmr::Error::LocationOverflow if loc > crate::mmr::MAX_LOCATION

pub async fn sync(&mut self) -> Result<(), Error>

Sync all database state to disk. While this isn’t necessary to ensure durability of committed operations, periodic invocation may reduce memory usage and the time required to recover the database on restart.

pub async fn destroy(self) -> Result<(), Error>

Destroy the db, removing all data from disk.

pub fn new_batch(&self) -> UnmerkleizedBatch<'_, E, V, H, Mmr<E, H::Digest>>

Create a new speculative batch of operations with this database as its parent.

pub async fn apply_batch( &mut self, batch: Changeset<H::Digest, V>, ) -> Result<Range<Location>, Error>

Apply a changeset to the database.

A changeset is only valid if the database has not been modified since the batch that produced it was created. Multiple batches can be forked from the same parent for speculative execution, but only one may be applied. Applying a stale changeset returns Error::StaleChangeset.

Returns the range of locations written.

Trait Implementations

impl<E: Storage + Clock + Metrics, V: VariableValue, H: Hasher> LogStore for Keyless<E, V, H>

type Value = V

async fn bounds(&self) -> Range<Location>

Return [start, end) where start and end - 1 are the Locations of the oldest and newest retained operations respectively.

async fn get_metadata(&self) -> Result<Option<Self::Value>, Error>

Get the metadata associated with the last commit.

fn size(&self) -> impl Future<Output = Location> + Send

Return the Location of the next operation appended to this db.

impl<E: Storage + Clock + Metrics, V: VariableValue, H: Hasher> MerkleizedStore for Keyless<E, V, H>

type Digest = <H as Hasher>::Digest

The digest type used for authentication.

type Operation = Operation<V>

The operation type stored in the log.

fn root(&self) -> Self::Digest

Returns the root digest of the authenticated store.

async fn historical_proof( &self, historical_size: Location, start_loc: Location, max_ops: NonZeroU64, ) -> Result<(Proof<Self::Digest>, Vec<Self::Operation>), Error>

Generate and return:

fn proof( &self, start_loc: Location, max_ops: NonZeroU64, ) -> impl Future<Output = Result<(Proof<Self::Digest>, Vec<Self::Operation>), Error>> + Send

Generate and return: