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polkadot_node_network_protocol::request_response::outgoing

Struct OutgoingRequest

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pub struct OutgoingRequest<Req, FallbackReq = Req> {
    pub peer: Recipient,
    pub payload: Req,
    pub fallback_request: Option<(FallbackReq, Protocol)>,
    pub pending_response: ResponseSender,
}
Expand description

A request to be sent to the network bridge, including a sender for sending responses/failures.

The network implementation will make use of that sender for informing the requesting subsystem about responses/errors.

When using Recipient::Peer, keep in mind that no address (as in IP address and port) might be known for that specific peer. You are encouraged to use Peer for peers that you are expected to be already connected to. When using Recipient::Authority, the addresses can be found thanks to the authority discovery system.

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§peer: Recipient

Intended recipient of this request.

§payload: Req

The actual request to send over the wire.

§fallback_request: Option<(FallbackReq, Protocol)>

Optional fallback request and protocol.

§pending_response: ResponseSender

Sender which is used by networking to get us back a response.

Implementations§

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impl<Req, FallbackReq> OutgoingRequest<Req, FallbackReq>
where Req: IsRequest + Encode, Req::Response: Decode, FallbackReq: IsRequest + Encode, FallbackReq::Response: Decode,

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pub fn new( peer: Recipient, payload: Req, ) -> (Self, impl Future<Output = OutgoingResult<Req::Response>>)

Create a new OutgoingRequest.

It will contain a sender that is used by the networking for sending back responses. The connected receiver is returned as the second element in the returned tuple.

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pub fn new_with_fallback( peer: Recipient, payload: Req, fallback_request: FallbackReq, ) -> (Self, impl Future<Output = OutgoingResult<(Vec<u8>, ProtocolName)>>)

Create a new OutgoingRequest with a fallback in case the remote does not support this protocol. Useful when adding a new version of a req-response protocol, to achieve compatibility with the older version.

Returns a raw Vec<u8> response over the channel. Use the associated ProtocolName to know which request was the successful one and appropriately decode the response.

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pub fn encode_request(self) -> (Protocol, OutgoingRequest<Vec<u8>>)

Encode a request into a Vec<u8>.

As this throws away type information, we also return the Protocol this encoded request adheres to.

Trait Implementations§

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impl<Req: Debug, FallbackReq: Debug> Debug for OutgoingRequest<Req, FallbackReq>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<Req, FallbackReq> Freeze for OutgoingRequest<Req, FallbackReq>
where Req: Freeze, FallbackReq: Freeze,

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impl<Req, FallbackReq = Req> !RefUnwindSafe for OutgoingRequest<Req, FallbackReq>

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impl<Req, FallbackReq> Send for OutgoingRequest<Req, FallbackReq>
where Req: Send, FallbackReq: Send,

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impl<Req, FallbackReq> Sync for OutgoingRequest<Req, FallbackReq>
where Req: Sync, FallbackReq: Sync,

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impl<Req, FallbackReq> Unpin for OutgoingRequest<Req, FallbackReq>
where Req: Unpin, FallbackReq: Unpin,

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impl<Req, FallbackReq = Req> !UnwindSafe for OutgoingRequest<Req, FallbackReq>

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