Lib.rs

Generic request/response protocols.

General Usage

The Behaviour struct is a NetworkBehaviour that implements a generic request/response protocol or protocol family, whereby each request is sent over a new substream on a connection. Behaviour is generic over the actual messages being sent, which are defined in terms of a Codec. Creating a request/response protocol thus amounts to providing an implementation of this trait which can then be given to Behaviour::with_codec. Further configuration options are available via the Config.

Requests are sent using Behaviour::send_request and the responses received as Message::Response via Event::Message.

Responses are sent using Behaviour::send_response upon receiving a Message::Request via Event::Message.

Predefined codecs

In case your message types implement serde::Serialize and serde::Deserialize, you can use two predefined behaviours:

• cbor::Behaviour for CBOR-encoded messages
• json::Behaviour for JSON-encoded messages

Protocol Families

A single Behaviour instance can be used with an entire protocol family that share the same request and response types. For that purpose, Codec::Protocol is typically instantiated with a sum type.

Limited Protocol Support

It is possible to only support inbound or outbound requests for a particular protocol. This is achieved by instantiating Behaviour with protocols using ProtocolSupport::Inbound or ProtocolSupport::Outbound. Any subset of protocols of a protocol family can be configured in this way. Such protocols will not be advertised during inbound respectively outbound protocol negotiation on the substreams.