Extract encode_and_send_msg into a method.

This is a response to splitting #585 into smaller components. This extraction will permit a future extraction of all message handling into a separate method, and then later even into a separate trait that will be accessible through language bindings.

diff --git a/lightning/src/ln/peer_handler.rs b/lightning/src/ln/peer_handler.rs
index dc3c37c41fc3abeda9afdbce193147aba01beb4e..e75c2c96e98c9e28dc24170f379c58bb42b6c4ac 100644 (file)
--- a/lightning/src/ln/peer_handler.rs
+++ b/lightning/src/ln/peer_handler.rs
@@ -12,7 +12,7 @@ use ln::features::InitFeatures;
 use ln::msgs;
 use ln::msgs::ChannelMessageHandler;
 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
-use util::ser::VecWriter;
+use util::ser::{VecWriter, Writeable};
 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
 use ln::wire;
 use ln::wire::Encode;
@@ -459,6 +459,17 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                }
        }
 
+       /// Append a message to a peer's pending outbound/write buffer, and update the map of peers needing sends accordingly.
+       fn enqueue_message<M: Encode + Writeable>(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, descriptor: Descriptor, message: &M) {
+               let mut buffer = VecWriter(Vec::new());
+               wire::write(message, &mut buffer).unwrap(); // crash if the write failed
+               let encoded_message = buffer.0;
+
+               log_trace!(self.logger, "Enqueueing message of type {} to {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
+               peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
+               peers_needing_send.insert(descriptor);
+       }
+
        fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
                let pause_read = {
                        let mut peers_lock = self.peers.lock().unwrap();
@@ -481,16 +492,6 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                                                if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
                                                        peer.pending_read_buffer_pos = 0;
 
-                                                       macro_rules! encode_and_send_msg {
-                                                               ($msg: expr) => {
-                                                                       {
-                                                                               log_trace!(self.logger, "Encoding and sending message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
-                                                                               peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&$msg)[..]));
-                                                                               peers.peers_needing_send.insert(peer_descriptor.clone());
-                                                                       }
-                                                               }
-                                                       }
-
                                                        macro_rules! try_potential_handleerror {
                                                                ($thing: expr) => {
                                                                        match $thing {
@@ -508,7 +509,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                                                                                                },
                                                                                                msgs::ErrorAction::SendErrorMessage { msg } => {
                                                                                                        log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
-                                                                                                       encode_and_send_msg!(msg);
+                                                                                                       self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &msg);
                                                                                                        continue;
                                                                                                },
                                                                                        }
@@ -554,7 +555,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                                                                        }
 
                                                                        let resp = msgs::Init { features };
-                                                                       encode_and_send_msg!(resp);
+                                                                       self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
                                                                },
                                                                NextNoiseStep::ActThree => {
                                                                        let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
@@ -653,7 +654,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                                                                                                        }
 
                                                                                                        let resp = msgs::Init { features };
-                                                                                                       encode_and_send_msg!(resp);
+                                                                                                       self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
                                                                                                }
 
                                                                                                self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
@@ -682,7 +683,7 @@ impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor,
                                                                                        wire::Message::Ping(msg) => {
                                                                                                if msg.ponglen < 65532 {
                                                                                                        let resp = msgs::Pong { byteslen: msg.ponglen };
-                                                                                                       encode_and_send_msg!(resp);
+                                                                                                       self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
                                                                                                }
                                                                                        },
                                                                                        wire::Message::Pong(_msg) => {