mirror of https://github.com/poanetwork/hbbft.git
103 lines
3.2 KiB
Rust
103 lines
3.2 KiB
Rust
//! Comms task structure. A comms task communicates with a remote node through a
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//! socket. Local communication with coordinating threads is made via
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//! `crossbeam_channel::unbounded()`.
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use crossbeam;
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use crossbeam_channel::{Receiver, Sender};
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use std::fmt::Debug;
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use std::io;
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use std::net::TcpStream;
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use std::sync::Arc;
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use hbbft::messaging::SourcedMessage;
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use hbbft::proto::Message;
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use hbbft::proto_io::{self, ProtoIo};
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#[derive(Debug)]
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pub enum Error {
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IoError(io::Error),
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}
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impl From<io::Error> for Error {
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fn from(err: io::Error) -> Error {
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Error::IoError(err)
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}
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}
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/// A communication task connects a remote node to the thread that manages the
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/// consensus algorithm.
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pub struct CommsTask<'a, T: 'a + Clone + Debug + Send + Sync + From<Vec<u8>> + AsRef<[u8]>> {
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/// The transmit side of the multiple producer channel from comms threads.
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tx: &'a Sender<SourcedMessage<T>>,
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/// The receive side of the channel to the comms thread.
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rx: &'a Receiver<Message<T>>,
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/// The socket IO task.
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io: ProtoIo<TcpStream>,
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/// The index of this comms task for identification against its remote node.
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pub node_index: usize,
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}
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impl<'a, T: 'a + Clone + Debug + Send + Sync + From<Vec<u8>> + AsRef<[u8]>> CommsTask<'a, T> {
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pub fn new(
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tx: &'a Sender<SourcedMessage<T>>,
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rx: &'a Receiver<Message<T>>,
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stream: TcpStream,
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node_index: usize,
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) -> Self {
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debug!(
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"Creating comms task #{} for {:?}",
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node_index,
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stream.peer_addr().unwrap()
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);
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CommsTask {
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tx,
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rx,
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io: ProtoIo::from_stream(stream),
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node_index,
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}
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}
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/// The main socket IO loop and an asynchronous thread responding to manager
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/// thread requests.
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pub fn run(&mut self) -> Result<(), Error> {
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// Borrow parts of `self` before entering the thread binding scope.
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let tx = Arc::new(self.tx);
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let rx = Arc::new(self.rx);
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let mut io1 = self.io.try_clone()?;
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let node_index = self.node_index;
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crossbeam::scope(|scope| {
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// Local comms receive loop thread.
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scope.spawn(move || {
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loop {
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// Receive a multicast message from the manager thread.
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let message = rx.recv().unwrap();
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// Forward the message to the remote node.
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io1.send(message).unwrap();
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}
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});
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// Remote comms receive loop.
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debug!("Starting remote RX loop for node {}", node_index);
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loop {
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match self.io.recv() {
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Ok(message) => {
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tx.send(SourcedMessage {
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source: node_index,
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message,
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}).unwrap();
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}
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Err(proto_io::Error::ProtobufError(e)) => {
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warn!("Node {} - Protobuf error {}", node_index, e)
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}
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Err(e) => {
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warn!("Node {} - Critical error {:?}", node_index, e);
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break;
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}
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}
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}
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});
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Ok(())
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}
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}
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