p2p: set up unit test logging

This change ensures we pass the Server logger down to Peer instances and
discovery. Test logging now works in all Server tests.

p2p/peer.go

@@ -120,7 +120,7 @@ func NewPeer(id enode.ID, name string, caps []Cap) *Peer {
 	pipe, _ := net.Pipe()
 	node := enode.SignNull(new(enr.Record), id)
 	conn := &conn{fd: pipe, transport: nil, node: node, caps: caps, name: name}
-	peer := newPeer(conn, nil)
+	peer := newPeer(log.Root(), conn, nil)
 	close(peer.closed) // ensures Disconnect doesn't block
 	return peer
 }
@@ -176,7 +176,7 @@ func (p *Peer) Inbound() bool {
 	return p.rw.is(inboundConn)
 }
 
-func newPeer(conn *conn, protocols []Protocol) *Peer {
+func newPeer(log log.Logger, conn *conn, protocols []Protocol) *Peer {
 	protomap := matchProtocols(protocols, conn.caps, conn)
 	p := &Peer{
 		rw:       conn,

p2p/peer_test.go

@@ -24,6 +24,8 @@ import (
 	"reflect"
 	"testing"
 	"time"
+
+	"github.com/ethereum/go-ethereum/log"
 )
 
 var discard = Protocol{
@@ -52,7 +54,7 @@ func testPeer(protos []Protocol) (func(), *conn, *Peer, <-chan error) {
 		c2.caps = append(c2.caps, p.cap())
 	}
 
-	peer := newPeer(c1, protos)
+	peer := newPeer(log.Root(), c1, protos)
 	errc := make(chan error, 1)
 	go func() {
 		_, err := peer.run()

p2p/server.go

@@ -416,7 +416,7 @@ func (srv *Server) Start() (err error) {
 	srv.running = true
 	srv.log = srv.Config.Logger
 	if srv.log == nil {
-		srv.log = log.New()
+		srv.log = log.Root()
 	}
 	if srv.NoDial && srv.ListenAddr == "" {
 		srv.log.Warn("P2P server will be useless, neither dialing nor listening")
@@ -542,6 +542,7 @@ func (srv *Server) setupDiscovery() error {
 			NetRestrict: srv.NetRestrict,
 			Bootnodes:   srv.BootstrapNodes,
 			Unhandled:   unhandled,
+			Log:         srv.log,
 		}
 		ntab, err := discover.ListenUDP(conn, srv.localnode, cfg)
 		if err != nil {
@@ -723,7 +724,7 @@ running:
 			err := srv.protoHandshakeChecks(peers, inboundCount, c)
 			if err == nil {
 				// The handshakes are done and it passed all checks.
-				p := newPeer(c, srv.Protocols)
+				p := newPeer(srv.log, c, srv.Protocols)
 				// If message events are enabled, pass the peerFeed
 				// to the peer
 				if srv.EnableMsgEvents {

p2p/server_test.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/internal/testlog"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/ethereum/go-ethereum/p2p/enr"
@@ -74,6 +75,7 @@ func startTestServer(t *testing.T, remoteKey *ecdsa.PublicKey, pf func(*Peer)) *
 		MaxPeers:   10,
 		ListenAddr: "127.0.0.1:0",
 		PrivateKey: newkey(),
+		Logger:     testlog.Logger(t, log.LvlTrace),
 	}
 	server := &Server{
 		Config:       config,
@@ -359,6 +361,7 @@ func TestServerAtCap(t *testing.T) {
 			PrivateKey:   newkey(),
 			MaxPeers:     10,
 			NoDial:       true,
+			NoDiscovery:  true,
 			TrustedNodes: []*enode.Node{newNode(trustedID, nil)},
 		},
 	}
@@ -433,6 +436,7 @@ func TestServerPeerLimits(t *testing.T) {
 			PrivateKey:  srvkey,
 			MaxPeers:    0,
 			NoDial:      true,
+			NoDiscovery: true,
 			Protocols:   []Protocol{discard},
 		},
 		newTransport: func(fd net.Conn) transport { return tp },
@@ -541,20 +545,25 @@ func TestServerSetupConn(t *testing.T) {
 	}
 
 	for i, test := range tests {
-		srv := &Server{
-			Config: Config{
+		t.Run(test.wantCalls, func(t *testing.T) {
+			cfg := Config{
 				PrivateKey:  srvkey,
 				MaxPeers:    10,
 				NoDial:      true,
+				NoDiscovery: true,
 				Protocols:   []Protocol{discard},
-			},
+				Logger:      testlog.Logger(t, log.LvlTrace),
+			}
+			srv := &Server{
+				Config:       cfg,
 				newTransport: func(fd net.Conn) transport { return test.tt },
-			log:          log.New(),
+				log:          cfg.Logger,
 			}
 			if !test.dontstart {
 				if err := srv.Start(); err != nil {
 					t.Fatalf("couldn't start server: %v", err)
 				}
+				defer srv.Stop()
 			}
 			p1, _ := net.Pipe()
 			srv.SetupConn(p1, test.flags, test.dialDest)
@@ -564,6 +573,7 @@ func TestServerSetupConn(t *testing.T) {
 			if test.tt.calls != test.wantCalls {
 				t.Errorf("test %d: calls mismatch: got %q, want %q", i, test.tt.calls, test.wantCalls)
 			}
+		})
 	}
 }