93 lines
2.9 KiB
Rust
93 lines
2.9 KiB
Rust
use crate::error;
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use crate::messages::NodeMessage;
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use beacon_chain::BeaconChain;
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use crossbeam_channel::{unbounded as channel, Sender, TryRecvError};
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use futures::future;
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use futures::prelude::*;
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use libp2p::rpc;
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use libp2p::{PeerId, RPCEvent};
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use slog::debug;
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use std::collections::HashMap;
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use std::sync::{Arc, Mutex};
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use std::time::{Duration, Instant};
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use sync::SimpleSync;
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use types::Hash256;
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/// Timeout for establishing a HELLO handshake.
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const HELLO_TIMEOUT: Duration = Duration::from_secs(30);
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/// Handles messages received from the network and client and organises syncing.
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pub struct MessageHandler<T: ClientTypes> {
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/// Currently loaded and initialised beacon chain.
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chain: BeaconChain<T::DB, T::SlotClock, T::ForkChoice>,
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/// The syncing framework.
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sync: SimpleSync,
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/// A mapping of peers we have sent a HELLO rpc request to.
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hello_requests: HashMap<PeerId, Instant>,
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/// The `MessageHandler` logger.
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log: slog::Logger,
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}
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/// Types of messages the handler can receive.
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#[derive(Debug, Clone)]
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pub enum HandlerMessage {
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/// We have initiated a connection to a new peer.
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PeerDialed(PeerId),
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/// Peer has disconnected,
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PeerDisconnected(PeerId),
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/// A Node message has been received.
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Message(PeerId, NodeMessage),
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/// An RPC response/request has been received.
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RPC(RPCEvent),
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}
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impl<T: ClientTypes> MessageHandler<T> {
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/// Initializes and runs the MessageHandler.
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pub fn new(
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beacon_chain: Arc<BeaconChain<T::DB, T::SlotClock, T::ForkChoice>>,
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executor: &tokio::runtime::TaskExecutor,
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log: slog::Logger,
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) -> error::Result<Sender<HandlerMessage>> {
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debug!(log, "Service starting");
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let (handler_send, handler_recv) = channel();
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// Initialise sync and begin processing in thread
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//TODO: Load genesis from BeaconChain
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//TODO: Initialise beacon chain
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let temp_genesis = Hash256::zero();
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// generate the Message handler
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let sync = SimpleSync::new(temp_genesis);
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let mut handler = MessageHandler {
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chain: beacon_chain,
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sync,
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hello_requests: HashMap::new(),
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log: log.clone(),
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};
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// spawn handler task
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// TODO: Handle manual termination of thread
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executor.spawn(future::poll_fn(move || -> Result<_, _> {
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loop {
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handler.handle_message(handler_recv.recv().map_err(|_| {
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debug!(log, "Handler channel closed. Handler terminating");
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})?);
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}
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}));
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Ok(handler_send)
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}
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fn handle_message(&mut self, message: HandlerMessage) {
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match message {
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HandlerMessage::PeerDialed(peer_id) => self.send_hello(peer_id),
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//TODO: Handle all messages
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_ => {}
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}
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}
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/// Sends a HELLO RPC request to a newly connected peer.
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fn send_hello(&self, peer_id: PeerId) {}
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}
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