Trait polkadot_service::AuxStore

pub trait AuxStore {
    fn insert_aux<'a, 'b, 'c, I, D>(
        &self,
        insert: I,
        delete: D
    ) -> Result<(), Error>
    where
        'b: 'a,
        'c: 'a,
        I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
        D: IntoIterator<Item = &'a &'b [u8]>;
    fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8, Global>>, Error>;
}

Provides access to an auxiliary database.

This is a simple global database not aware of forks. Can be used for storing auxiliary information like total block weight/difficulty for fork resolution purposes as a common use case.

Required Methods

fn insert_aux<'a, 'b, 'c, I, D>(&self, insert: I, delete: D) -> Result<(), Error>where
    'b: 'a,
    'c: 'a,
    I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
    D: IntoIterator<Item = &'a &'b [u8]>,

Insert auxiliary data into key-value store.

Deletions occur after insertions.

fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8, Global>>, Error>

Query auxiliary data from key-value store.

Implementations on Foreign Types

impl<Block> AuxStore for Backend<Block>where
    Block: Block,

fn insert_aux<'a, 'b, 'c, I, D>(&self, insert: I, delete: D) -> Result<(), Error>where
    'b: 'a,
    'c: 'a,
    I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
    D: IntoIterator<Item = &'a &'b [u8]>,

fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8, Global>>, Error>

Implementors

impl<Block> AuxStore for sc_client_api::in_mem::Backend<Block>where
    Block: Block,
    <Block as Block>::Hash: Ord,

impl<Block> AuxStore for Blockchain<Block>where
    Block: Block,