arc-malachitebft-sync 0.7.0-pre

Synchronization protocol for the Malachite BFT consensus engine
Documentation 
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use bytes::Bytes;
use eyre::Result;
use libp2p::request_response::{self as rpc, OutboundRequestId, ProtocolSupport};
use libp2p::swarm::NetworkBehaviour;
use libp2p::{PeerId, StreamProtocol};
use thiserror::Error;

use crate::rpc::Codec;
use crate::types::{RawRequest, RawResponse, ResponseChannel};
use crate::Config;

#[derive(NetworkBehaviour)]
#[behaviour(to_swarm = "Event")]
pub struct Behaviour {
    rpc: rpc::Behaviour<Codec>,
}

pub type Event = rpc::Event<RawRequest, RawResponse>;

impl Behaviour {
    pub fn new(config: Config, sync_protocol: String) -> Result<Self> {
        let protocol = [(
            StreamProtocol::try_from_owned(sync_protocol)?,
            ProtocolSupport::Full,
        )];
        let rpc_config = rpc::Config::default().with_request_timeout(config.request_timeout);

        Ok(Self {
            rpc: rpc::Behaviour::with_codec(Codec::new(config), protocol, rpc_config),
        })
    }

    pub fn send_response(&mut self, channel: ResponseChannel, data: Bytes) -> Result<(), Error> {
        self.rpc
            .send_response(channel, RawResponse(data))
            .map_err(|_| Error::SendResponse)
    }

    pub fn send_request(&mut self, peer: PeerId, data: Bytes) -> OutboundRequestId {
        self.rpc.send_request(&peer, RawRequest(data))
    }
}

#[derive(Clone, Debug, Error)]
pub enum Error {
    #[error("Failed to send response")]
    SendResponse,

    #[error("Failed to send request")]
    SendRequest,
}

impl Behaviour {
    pub fn with_default_protocol(config: Config) -> Self {
        // Infallible constructor using hardcoded default protocol
        let protocol = [(
            StreamProtocol::new("/malachitebft-sync/v1beta1"),
            ProtocolSupport::Full,
        )];
        let rpc_config = rpc::Config::default().with_request_timeout(config.request_timeout);

        Self {
            rpc: rpc::Behaviour::with_codec(Codec::new(config), protocol, rpc_config),
        }
    }
}

impl Default for Behaviour {
    fn default() -> Self {
        Self::with_default_protocol(Config::default())
    }
}