Trait sc_client_api::light::Fetcher

pub trait Fetcher<Block: BlockT>: Send + Sync {
    type RemoteHeaderResult: Future<Output = Result<Block::Header, ClientError>> + Unpin + Send + 'static;
    type RemoteReadResult: Future<Output = Result<HashMap<Vec<u8>, Option<Vec<u8>>>, ClientError>> + Unpin + Send + 'static;
    type RemoteCallResult: Future<Output = Result<Vec<u8>, ClientError>> + Unpin + Send + 'static;
    type RemoteChangesResult: Future<Output = Result<Vec<(NumberFor<Block>, u32)>, ClientError>> + Unpin + Send + 'static;
    type RemoteBodyResult: Future<Output = Result<Vec<Block::Extrinsic>, ClientError>> + Unpin + Send + 'static;
    fn remote_header(
        &self, 
        request: RemoteHeaderRequest<Block::Header>
    ) -> Self::RemoteHeaderResult;
    fn remote_read(
        &self, 
        request: RemoteReadRequest<Block::Header>
    ) -> Self::RemoteReadResult;
    fn remote_read_child(
        &self, 
        request: RemoteReadChildRequest<Block::Header>
    ) -> Self::RemoteReadResult;
    fn remote_call(
        &self, 
        request: RemoteCallRequest<Block::Header>
    ) -> Self::RemoteCallResult;
    fn remote_changes(
        &self, 
        request: RemoteChangesRequest<Block::Header>
    ) -> Self::RemoteChangesResult;
    fn remote_body(
        &self, 
        request: RemoteBodyRequest<Block::Header>
    ) -> Self::RemoteBodyResult;
}

Light client data fetcher. Implementations of this trait must check if remote data is correct (see FetchedDataChecker) and return already checked data.

Associated Types

type RemoteHeaderResult: Future<Output = Result<Block::Header, ClientError>> + Unpin + Send + 'static

Remote header future.

type RemoteReadResult: Future<Output = Result<HashMap<Vec<u8>, Option<Vec<u8>>>, ClientError>> + Unpin + Send + 'static

Remote storage read future.

type RemoteCallResult: Future<Output = Result<Vec<u8>, ClientError>> + Unpin + Send + 'static

Remote call result future.

type RemoteChangesResult: Future<Output = Result<Vec<(NumberFor<Block>, u32)>, ClientError>> + Unpin + Send + 'static

Remote changes result future.

type RemoteBodyResult: Future<Output = Result<Vec<Block::Extrinsic>, ClientError>> + Unpin + Send + 'static

Remote block body result future.

Required methods

fn remote_header(
    &self,
    request: RemoteHeaderRequest<Block::Header>
) -> Self::RemoteHeaderResult

Fetch remote header.

fn remote_read(
    &self,
    request: RemoteReadRequest<Block::Header>
) -> Self::RemoteReadResult

Fetch remote storage value.

fn remote_read_child(
    &self,
    request: RemoteReadChildRequest<Block::Header>
) -> Self::RemoteReadResult

Fetch remote storage child value.

fn remote_call(
    &self,
    request: RemoteCallRequest<Block::Header>
) -> Self::RemoteCallResult

Fetch remote call result.

fn remote_changes(
    &self,
    request: RemoteChangesRequest<Block::Header>
) -> Self::RemoteChangesResult

Fetch remote changes ((block number, extrinsic index)) where given key has been changed at a given blocks range.

fn remote_body(
    &self,
    request: RemoteBodyRequest<Block::Header>
) -> Self::RemoteBodyResult

Fetch remote block body

Implementors