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Trait staging_xcm_executor::traits::QueryHandler

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

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

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

Required Associated Types§

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type BlockNumber: Zero + Encode

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type Error

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type UniversalLocation: Get<InteriorLocation>

Required Methods§

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

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

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

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

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

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fn expect_response(id: QueryId, response: Response)

Makes sure to expect a response with the given id.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl QueryHandler for ()

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type BlockNumber = u64

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type Error = ()

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type UniversalLocation = UniversalLocation

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fn take_response(_query_id: QueryId) -> QueryResponseStatus<Self::BlockNumber>

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fn new_query( _responder: impl Into<Location>, _timeout: Self::BlockNumber, _match_querier: impl Into<Location>, ) -> QueryId

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

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fn expect_response(_id: QueryId, _response: Response)

Implementors§