Struct staging_xcm_builder::WithUniqueTopic

pub struct WithUniqueTopic<Inner>(/* private fields */);

Wrapper router which, if the message does not already end with a SetTopic instruction, appends one to the message filled with a universally unique ID. This ID is returned from a successful deliver.

If the message does already end with a SetTopic instruction, then it is the responsibility of the code author to ensure that the ID supplied to SetTopic is universally unique. Due to this property, consumers of the topic ID must be aware that a user-supplied ID may not be unique.

This is designed to be at the top-level of any routers, since it will always mutate the passed message reference into a None. Don’t try to combine it within a tuple except as the last element.

Trait Implementations

impl<Inner: SendXcm> SendXcm for WithUniqueTopic<Inner>

type Ticket = (<Inner as SendXcm>::Ticket, [u8; 32])

Intermediate value which connects the two phases of the send operation.

fn validate( destination: &mut Option<Location>, message: &mut Option<Xcm<()>> ) -> SendResult<Self::Ticket>

Check whether the given _message is deliverable to the given _destination and if so determine the cost which will be paid by this chain to do so, returning a Validated token which can be used to enact delivery.

fn deliver(ticket: Self::Ticket) -> Result<XcmHash, SendError>

Actually carry out the delivery operation for a previously validated message sending.