Updates based on code review

.github/workflows/build-short.yml

@@ -11,4 +11,4 @@ jobs:
         with:
           go-version: 1.16.5
       - run: go build .
-      - run: cd server && go test -v -race
+      - run: go test -v -race ./...

.github/workflows/build.yml

@@ -30,4 +30,4 @@ jobs:
       - run: go get github.com/golang/protobuf/protoc-gen-go google.golang.org/grpc/cmd/protoc-gen-go-grpc
       - run: go build .
       - run: ./protobuf/build.sh
-      - run: cd server && go test -v -race
+      - run: go test -v -race ./...

server/federation.go

@@ -20,7 +20,7 @@ import (
 type Peer struct {
 	Address  string
 	Port     string
-	Ts      time.Time
+	LastSeen time.Time
 }
 
 var (
@@ -68,8 +68,7 @@ func (s *Server) getNumSubs() int64 {
 	return *s.NumPeerSubs
 }
 
-// getAndSetExternalIp takes the ip and port of a peer running a UDP server and
-// pings it, so we can determine our own external IP address.
+// getAndSetExternalIp detects the server's external IP and stores it.
 func (s *Server) getAndSetExternalIp(ip, port string) error {
 	pong, err := UDPPing(ip, port)
 	if err != nil {
@@ -148,7 +147,7 @@ retry:
 		newPeer := &Peer{
 			Address:  ipPort[0],
 			Port:     ipPort[1],
-			Ts:      time.Now(),
+			LastSeen: time.Now(),
 		}
 		log.Printf("pinging peer %+v\n", newPeer)
 		err = s.addPeer(newPeer, true, true)
@@ -377,7 +376,7 @@ func (s *Server) addPeer(newPeer *Peer, ping bool, subscribe bool) error {
 			}
 		}
 	} else {
-		oldServer.Ts = time.Now()
+		oldServer.LastSeen = time.Now()
 	}
 	return nil
 }
@@ -389,7 +388,7 @@ func (s *Server) mergePeers(servers []*pb.ServerMessage) {
 		newPeer := &Peer{
 			Address:  srvMsg.Address,
 			Port:     srvMsg.Port,
-			Ts:      time.Now(),
+			LastSeen: time.Now(),
 		}
 		err := s.addPeer(newPeer, false, true)
 		// This shouldn't happen because we're not pinging them.

server/server.go

@@ -248,7 +248,7 @@ func (s *Server) Hello(ctx context.Context, args *pb.HelloMessage) (*pb.HelloMes
 	newPeer := &Peer{
 		Address:  host,
 		Port:     port,
-		Ts:      time.Now(),
+		LastSeen: time.Now(),
 	}
 	log.Println(newPeer)
 
@@ -272,7 +272,7 @@ func (s *Server) PeerSubscribe(ctx context.Context, in *pb.ServerMessage) (*pb.S
 	peer := &Peer{
 		Address:  in.Address,
 		Port:     in.Port,
-		Ts:      time.Now(),
+		LastSeen: time.Now(),
 	}
 
 	if _, loaded := s.PeerSubsLoadOrStore(peer); !loaded {
@@ -292,7 +292,7 @@ func (s *Server) AddPeer(ctx context.Context, args *pb.ServerMessage) (*pb.Strin
 	newPeer := &Peer{
 		Address:  args.Address,
 		Port:     args.Port,
-		Ts:      time.Now(),
+		LastSeen: time.Now(),
 	}
 	err := s.addPeer(newPeer, true, true)
 	if err != nil {

server/udp.go

@@ -14,6 +14,9 @@ import (
 const maxBufferSize = 1024
 
 // genesis blocktime (which is actually wrong)
+// magic constant for the UDPPing protocol. The above comment is taken from
+// the python code this was implemented off of.
+// https://github.com/lbryio/lbry-sdk/blob/7d49b046d44a4b7067d5dc1d6cd65ff0475c71c8/lbry/wallet/server/udp.py#L12
 const magic = 1446058291
 const protocolVersion = 1
 const defaultFlags = 0b00000000