Add libp2p transport - tcp/ws/secio and multiplexing.

beacon_node/libp2p/src/service.rs

@@ -1,11 +1,50 @@
+use crate::NetworkConfig;
+use libp2p::gossipsub::GossipsubEvent;
+use libp2p::PeerId;
+use libp2p::{build_tcp_ws_secio_mplex_yamux, core, secio, Transport};
 use slog::debug;
+use std::error;
 
 /// The configuration and state of the libp2p components for the beacon node.
-pub struct Service {}
+pub struct Service {
+    /// This node's PeerId.
+    peer_id: PeerId,
+}
 
 impl Service {
-    pub fn new(log: slog::Logger) -> Self {
-        debug!(log, "Service starting");
-        Service {}
+    pub fn new(config: NetworkConfig, log: slog::Logger) -> Self {
+        debug!(log, "Libp2p Service starting");
+
+        let local_private_key = config.local_private_key;
+        let peer_id = local_private_key.to_peer_id();
+        debug!(log, "Local peer id: {:?}", peer_id);
+
+        // Set up the transport
+        let transport = build_transport(local_private_key);
+
+        //let transport = libp2p::
+
+        Service { peer_id }
     }
 }
+
+/// The implementation supports TCP/IP, WebSockets over TCP/IP, secio as the encryption layer, and
+/// mplex or yamux as the multiplexing layer.
+fn build_transport(
+    local_private_key: secio::SecioKeyPair,
+) -> impl Transport<
+    Output = (
+        PeerId,
+        impl core::muxing::StreamMuxer<OutboundSubstream = impl Send, Substream = impl Send>
+            + Send
+            + Sync,
+    ),
+    Error = impl error::Error + Send,
+    Listener = impl Send,
+    Dial = impl Send,
+    ListenerUpgrade = impl Send,
+> + Clone {
+    // TODO: The Wire protocol currently doesn't specify encryption and this will need to be customised
+    // in the future.
+    build_tcp_ws_secio_mplex_yamux(local_private_key)
+}