Trait staging_xcm_builder::QueryHandler

pub trait QueryHandler {
    type BlockNumber: Zero + Encode;
    type Error;
    type UniversalLocation: Get<Junctions>;

    // Required methods
    fn new_query(
        responder: impl Into<Location>,
        timeout: Self::BlockNumber,
        match_querier: impl Into<Location>
    ) -> u64;
    fn report_outcome(
        message: &mut Xcm<()>,
        responder: impl Into<Location>,
        timeout: Self::BlockNumber
    ) -> Result<u64, Self::Error>;
    fn take_response(id: u64) -> QueryResponseStatus<Self::BlockNumber>;
    fn expect_response(id: u64, response: Response);
}

Provides methods to expect responses from XCMs and query their status.

Required Associated Types

type BlockNumber: Zero + Encode

type Error

type UniversalLocation: Get<Junctions>

Required Methods

fn new_query( responder: impl Into<Location>, timeout: Self::BlockNumber, match_querier: impl Into<Location> ) -> u64

Attempt to create a new query ID and register it as a query that is yet to respond.

fn report_outcome( message: &mut Xcm<()>, responder: impl Into<Location>, timeout: Self::BlockNumber ) -> Result<u64, Self::Error>

Consume message and return another which is equivalent to it except that it reports back the outcome.

• message: The message whose outcome should be reported.
• responder: The origin from which a response should be expected.
• timeout: The block number after which it is permissible to return NotFound from take_response.

report_outcome may return an error if the responder is not invertible.

It is assumed that the querier of the response will be Here. The response can be queried with take_response.

fn take_response(id: u64) -> QueryResponseStatus<Self::BlockNumber>

Attempt to remove and return the response of query with ID query_id.

fn expect_response(id: u64, response: Response)

Makes sure to expect a response with the given id.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl QueryHandler for ()

type BlockNumber = u64

type Error = ()

type UniversalLocation = UniversalLocation

fn take_response( _query_id: u64 ) -> QueryResponseStatus<<() as QueryHandler>::BlockNumber>

fn new_query( _responder: impl Into<Location>, _timeout: <() as QueryHandler>::BlockNumber, _match_querier: impl Into<Location> ) -> u64

fn report_outcome( _message: &mut Xcm<()>, _responder: impl Into<Location>, _timeout: <() as QueryHandler>::BlockNumber ) -> Result<u64, <() as QueryHandler>::Error>

fn expect_response(_id: u64, _response: Response)

Implementors