aquatic_ws: announce handler fixes, related changes elsewhere

aquatic_ws/src/lib/handler.rs

@@ -86,9 +86,42 @@ pub fn handle_announce_requests(
     messages_out: &mut Vec<(ConnectionMeta, OutMessage)>,
     requests: Drain<(ConnectionMeta, AnnounceRequest)>,
 ){
-    // if offers are set, fetch same number of peers, send offers to all of them
-    // if answer is set, fetch that peer, send answer to it
-    // finally, return announce response, I think
+    for (sender_meta, request) in requests {
+        let torrent_data = torrents.entry(request.info_hash)
+            .or_default();
+
+        if let Some(offers) = request.offers {
+            // if offers are set, fetch same number of peers, send offers to all of them
+        }
+
+        match (request.answer, request.to_peer_id, request.offer_id){
+            (Some(answer), Some(to_peer_id), Some(offer_id)) => {
+                if let Some(to_peer) = torrent_data.peers.get(&to_peer_id){
+                    let middleman_answer = MiddlemanAnswerToPeer {
+                        peer_id: request.peer_id,
+                        info_hash: request.info_hash,
+                        answer,
+                        offer_id,
+                    };
+
+                    messages_out.push((
+                        to_peer.connection_meta,
+                        OutMessage::Answer(middleman_answer)
+                    ));
+                }
+            },
+            _ => (),
+        }
+
+        let response = OutMessage::AnnounceResponse(AnnounceResponse {
+            info_hash: request.info_hash,
+            complete: torrent_data.seeders,
+            incomplete: torrent_data.leechers,
+            announce_interval: 120,
+        });
+
+        messages_out.push((sender_meta, response));
+    }
 }