Struct Freezer

pub struct Freezer {
    pub stopped: Arc<AtomicBool>,
    /* private fields */
}

Freezer is an memory mapped append-only database to store immutable chain data into flat files

Fields

stopped: Arc<AtomicBool>

stop flag

Implementations

impl Freezer

pub fn open(path: PathBuf) -> Result<Freezer, Error>

Creates a freezer at specified path

pub fn open_in<P: AsRef<Path>>(path: P) -> Result<Freezer, Error>

Creates a freezer at temporary path

pub fn freeze<F>( &self, threshold: BlockNumber, get_block_by_number: F, ) -> Result<BTreeMap<Byte32, (BlockNumber, u32)>, Error>

where F: Fn(BlockNumber) -> Option<BlockView>,

Freeze background process that periodically checks the chain data for any import progress and moves ancient data from the kv-db into the freezer.

pub fn retrieve(&self, number: BlockNumber) -> Result<Option<Vec<u8>>, Error>

Retrieve an item with the given number

pub fn number(&self) -> BlockNumber

Return total item number in the freezer

pub fn truncate(&self, item: u64) -> Result<(), Error>

Truncate discards any recent data above the provided threshold number.

Trait Implementations

impl Clone for Freezer

fn clone(&self) -> Freezer

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.