Struct TestPersistentOffchainDB

pub struct TestPersistentOffchainDB { /* private fields */ }

Sharable “persistent” offchain storage for test.

Implementations

impl TestPersistentOffchainDB

pub fn new() -> TestPersistentOffchainDB

Create a new and empty offchain storage db for persistent items

pub fn apply_offchain_changes( &mut self, changes: impl Iterator<Item = ((Vec<u8>, Vec<u8>), OffchainOverlayedChange)>, )

Apply a set of off-chain changes directly to the test backend

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

Retrieve a key from the test backend.

Trait Implementations

impl Clone for TestPersistentOffchainDB

fn clone(&self) -> TestPersistentOffchainDB

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TestPersistentOffchainDB

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

Formats the value using the given formatter.

impl Default for TestPersistentOffchainDB

fn default() -> TestPersistentOffchainDB

Returns the “default value” for a type.

impl OffchainStorage for TestPersistentOffchainDB

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], key: &[u8], old_value: Option<&[u8]>, new_value: &[u8], ) -> bool

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