noosphere-ns 0.9.3

A P2P name system for Noosphere
Documentation 
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use crate::dht::errors::DhtError;
use crate::dht::DhtConfig;
use libp2p::{
    allow_block_list,
    core::muxing::StreamMuxerBox,
    core::transport::Boxed,
    core::upgrade,
    dns,
    identify::{Behaviour as Identify, Config as IdentifyConfig, Event as IdentifyEvent},
    identity::Keypair,
    kad::{self, Kademlia, KademliaConfig, KademliaEvent, KademliaStoreInserts},
    noise,
    swarm::{self, NetworkBehaviour, SwarmBuilder, SwarmEvent, THandlerErr},
    tcp, yamux, PeerId, Swarm, Transport,
};
use std::time::Duration;
use std::{io, result::Result};
use void::Void;

const CONNECTION_TIMEOUT_SECONDS: u64 = 20;

#[derive(Debug)]
#[allow(clippy::large_enum_variant)]
pub enum DHTEvent {
    Kademlia(KademliaEvent),
    Identify(IdentifyEvent),
    Void,
}

impl From<KademliaEvent> for DHTEvent {
    fn from(event: KademliaEvent) -> Self {
        DHTEvent::Kademlia(event)
    }
}

impl From<IdentifyEvent> for DHTEvent {
    fn from(event: IdentifyEvent) -> Self {
        DHTEvent::Identify(event)
    }
}

impl From<Void> for DHTEvent {
    fn from(_: Void) -> Self {
        DHTEvent::Void
    }
}

#[derive(NetworkBehaviour)]
#[behaviour(out_event = "DHTEvent", event_process = false)]
pub struct DhtBehavior {
    pub identify: Identify,
    pub kad: Kademlia<kad::record::store::MemoryStore>,
    blocked_peers: allow_block_list::Behaviour<allow_block_list::BlockedPeers>,
}

pub type DHTSwarmEvent =
    SwarmEvent<<DhtBehavior as swarm::NetworkBehaviour>::OutEvent, THandlerErr<DhtBehavior>>;

impl DhtBehavior {
    pub fn new(keypair: &Keypair, local_peer_id: &PeerId, config: &DhtConfig) -> Self {
        let kad = {
            let mut cfg = KademliaConfig::default();
            cfg.set_query_timeout(Duration::from_secs(config.query_timeout.into()));
            // By default, all records from peers are automatically stored.
            // `FilterBoth` means it's the Kademlia behaviour handler's responsibility
            // to determine whether or not Provider records and KV records ("both") get stored,
            // where we implement logic to validate/prune incoming records.
            cfg.set_record_filtering(KademliaStoreInserts::FilterBoth);

            // These configurations only apply to Value records.
            cfg.set_record_ttl(Some(Duration::from_secs(config.record_ttl.into())));
            cfg.set_publication_interval(Some(Duration::from_secs(
                config.publication_interval.into(),
            )));
            cfg.set_replication_interval(Some(Duration::from_secs(
                config.replication_interval.into(),
            )));

            // These configurations are for Provider records. No replication interval available.
            cfg.set_provider_record_ttl(Some(Duration::from_secs(config.record_ttl.into())));
            cfg.set_provider_publication_interval(Some(Duration::from_secs(
                config.publication_interval.into(),
            )));

            // TODO(#99): Use SphereFS storage
            let store = kad::record::store::MemoryStore::new(local_peer_id.to_owned());
            Kademlia::with_config(local_peer_id.to_owned(), store, cfg)
        };

        let identify = {
            let config = IdentifyConfig::new("ipfs/1.0.0".into(), keypair.public())
                .with_agent_version(format!("noosphere-ns/{}", env!("CARGO_PKG_VERSION")));
            Identify::new(config)
        };

        DhtBehavior {
            kad,
            identify,
            blocked_peers: allow_block_list::Behaviour::default(),
        }
    }
}

/// Creates the Transport mechanism that describes how peers communicate.
/// Currently, mostly an inlined form of `libp2p::tokio_development_transport`.
fn build_transport(keypair: &Keypair) -> Result<Boxed<(PeerId, StreamMuxerBox)>, io::Error> {
    let transport =
        dns::TokioDnsConfig::system(tcp::tokio::Transport::new(tcp::Config::new().nodelay(true)))?;
    let noise_keys = noise::Config::new(keypair).expect("Noise key generation failed.");

    Ok(transport
        .upgrade(upgrade::Version::V1)
        .authenticate(noise_keys)
        .multiplex(yamux::Config::default())
        .timeout(std::time::Duration::from_secs(CONNECTION_TIMEOUT_SECONDS))
        .boxed())
}

/// Builds a configured [libp2p::swarm::Swarm] instance.
pub fn build_swarm(
    keypair: &Keypair,
    local_peer_id: &PeerId,
    config: &DhtConfig,
) -> Result<Swarm<DhtBehavior>, DhtError> {
    let transport = build_transport(keypair).map_err(DhtError::from)?;
    let behaviour = DhtBehavior::new(keypair, local_peer_id, config);
    let swarm =
        SwarmBuilder::with_tokio_executor(transport, behaviour, local_peer_id.to_owned()).build();
    Ok(swarm)
}