ws: refactor, bug fixes, improvements (#155)

- split swarm worker into two modules
- split socket worker into two modules
- keep track of which offers peers have sent and only allow matching
answers
- always clean up after closing connection
- use channel for telling connections to close
- move some logic into new ConnectionRunner struct
- use slotmap for connection reference storage
- fix double counting of error responses
- actually close connections that take too long to send responses to
- remove announced_info_hashes entry on AnnounceEvent::Stopped

crates/ws/src/common.rs

@@ -34,8 +34,9 @@ pub struct PendingScrapeId(pub u8);
 #[derive(Copy, Clone, Debug)]
 pub struct ConsumerId(pub u8);
 
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub struct ConnectionId(pub usize);
+slotmap::new_key_type! {
+    pub struct ConnectionId;
+}
 
 #[derive(Clone, Copy, Debug)]
 pub struct InMessageMeta {