Trait sc_client_api::backend::AuxStore

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

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

Insert auxiliary data into key-value store.

Deletions occur after insertions.

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

Query auxiliary data from key-value store.

Implementors

impl<Block: BlockT> AuxStore for Backend<Block>where Block::Hash: Ord,

impl<Block: BlockT> AuxStore for Blockchain<Block>