Struct LocalStorage

pub struct LocalStorage { /* private fields */ }

Offchain local storage

Implementations

impl LocalStorage

pub fn new(db: Arc<dyn Database<DbHash>>) -> Self

Create offchain local storage with given KeyValueDB backend.

Trait Implementations

impl Clone for LocalStorage

fn clone(&self) -> LocalStorage

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for LocalStorage

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl OffchainStorage for LocalStorage

fn set(&mut self, prefix: &[u8], key: &[u8], value: &[u8])

Persist a value in storage under given key and prefix.

fn remove(&mut self, prefix: &[u8], key: &[u8])

Clear a storage entry under given key and prefix.

fn get(&self, prefix: &[u8], key: &[u8]) -> Option<Vec<u8>>

Retrieve a value from storage under given key and prefix.

fn compare_and_set( &mut self, prefix: &[u8], item_key: &[u8], old_value: Option<&[u8]>, new_value: &[u8], ) -> bool

Replace the value in storage if given old_value matches the current one.