package p2p import ( "bytes" "errors" "fmt" "math/rand" "net" "reflect" "testing" "time" ) var discard = Protocol{ Name: "discard", Length: 1, Run: func(p *Peer, rw MsgReadWriter) error { for { msg, err := rw.ReadMsg() if err != nil { return err } fmt.Printf("discarding %d\n", msg.Code) if err = msg.Discard(); err != nil { return err } } }, } func testPeer(protos []Protocol) (func(), *conn, *Peer, <-chan DiscReason) { fd1, _ := net.Pipe() hs1 := &protoHandshake{ID: randomID(), Version: baseProtocolVersion} hs2 := &protoHandshake{ID: randomID(), Version: baseProtocolVersion} for _, p := range protos { hs1.Caps = append(hs1.Caps, p.cap()) hs2.Caps = append(hs2.Caps, p.cap()) } p1, p2 := MsgPipe() peer := newPeer(fd1, &conn{p1, hs1}, protos) errc := make(chan DiscReason, 1) go func() { errc <- peer.run() }() closer := func() { p1.Close() fd1.Close() } return closer, &conn{p2, hs2}, peer, errc } func TestPeerProtoReadMsg(t *testing.T) { defer testlog(t).detach() done := make(chan struct{}) proto := Protocol{ Name: "a", Length: 5, Run: func(peer *Peer, rw MsgReadWriter) error { if err := ExpectMsg(rw, 2, []uint{1}); err != nil { t.Error(err) } if err := ExpectMsg(rw, 3, []uint{2}); err != nil { t.Error(err) } if err := ExpectMsg(rw, 4, []uint{3}); err != nil { t.Error(err) } close(done) return nil }, } closer, rw, _, errc := testPeer([]Protocol{proto}) defer closer() Send(rw, baseProtocolLength+2, []uint{1}) Send(rw, baseProtocolLength+3, []uint{2}) Send(rw, baseProtocolLength+4, []uint{3}) select { case <-done: case err := <-errc: t.Errorf("peer returned: %v", err) case <-time.After(2 * time.Second): t.Errorf("receive timeout") } } func TestPeerProtoEncodeMsg(t *testing.T) { defer testlog(t).detach() proto := Protocol{ Name: "a", Length: 2, Run: func(peer *Peer, rw MsgReadWriter) error { if err := SendItems(rw, 2); err == nil { t.Error("expected error for out-of-range msg code, got nil") } if err := SendItems(rw, 1, "foo", "bar"); err != nil { t.Errorf("write error: %v", err) } return nil }, } closer, rw, _, _ := testPeer([]Protocol{proto}) defer closer() if err := ExpectMsg(rw, 17, []string{"foo", "bar"}); err != nil { t.Error(err) } } func TestPeerWriteForBroadcast(t *testing.T) { defer testlog(t).detach() closer, rw, peer, peerErr := testPeer([]Protocol{discard}) defer closer() emptymsg := func(code uint64) Msg { return Msg{Code: code, Size: 0, Payload: bytes.NewReader(nil)} } // test write errors if err := peer.writeProtoMsg("b", emptymsg(3)); err == nil { t.Errorf("expected error for unknown protocol, got nil") } if err := peer.writeProtoMsg("discard", emptymsg(8)); err == nil { t.Errorf("expected error for out-of-range msg code, got nil") } else if perr, ok := err.(*peerError); !ok || perr.Code != errInvalidMsgCode { t.Errorf("wrong error for out-of-range msg code, got %#v", err) } // setup for reading the message on the other end read := make(chan struct{}) go func() { if err := ExpectMsg(rw, 16, nil); err != nil { t.Error(err) } close(read) }() // test successful write if err := peer.writeProtoMsg("discard", emptymsg(0)); err != nil { t.Errorf("expect no error for known protocol: %v", err) } select { case <-read: case err := <-peerErr: t.Fatalf("peer stopped: %v", err) } } func TestPeerPing(t *testing.T) { defer testlog(t).detach() closer, rw, _, _ := testPeer(nil) defer closer() if err := SendItems(rw, pingMsg); err != nil { t.Fatal(err) } if err := ExpectMsg(rw, pongMsg, nil); err != nil { t.Error(err) } } func TestPeerDisconnect(t *testing.T) { defer testlog(t).detach() closer, rw, _, disc := testPeer(nil) defer closer() if err := SendItems(rw, discMsg, DiscQuitting); err != nil { t.Fatal(err) } if err := ExpectMsg(rw, discMsg, []interface{}{DiscRequested}); err != nil { t.Error(err) } closer() if reason := <-disc; reason != DiscRequested { t.Errorf("run returned wrong reason: got %v, want %v", reason, DiscRequested) } } // This test is supposed to verify that Peer can reliably handle // multiple causes of disconnection occurring at the same time. func TestPeerDisconnectRace(t *testing.T) { defer testlog(t).detach() maybe := func() bool { return rand.Intn(1) == 1 } for i := 0; i < 1000; i++ { protoclose := make(chan error) protodisc := make(chan DiscReason) closer, rw, p, disc := testPeer([]Protocol{ { Name: "closereq", Run: func(p *Peer, rw MsgReadWriter) error { return <-protoclose }, Length: 1, }, { Name: "disconnect", Run: func(p *Peer, rw MsgReadWriter) error { p.Disconnect(<-protodisc); return nil }, Length: 1, }, }) // Simulate incoming messages. go SendItems(rw, baseProtocolLength+1) go SendItems(rw, baseProtocolLength+2) // Close the network connection. go closer() // Make protocol "closereq" return. protoclose <- errors.New("protocol closed") // Make protocol "disconnect" call peer.Disconnect protodisc <- DiscAlreadyConnected // In some cases, simulate something else calling peer.Disconnect. if maybe() { go p.Disconnect(DiscInvalidIdentity) } // In some cases, simulate remote requesting a disconnect. if maybe() { go SendItems(rw, discMsg, DiscQuitting) } select { case <-disc: case <-time.After(2 * time.Second): // Peer.run should return quickly. If it doesn't the Peer // goroutines are probably deadlocked. Call panic in order to // show the stacks. panic("Peer.run took to long to return.") } } } func TestNewPeer(t *testing.T) { name := "nodename" caps := []Cap{{"foo", 2}, {"bar", 3}} id := randomID() p := NewPeer(id, name, caps) if p.ID() != id { t.Errorf("ID mismatch: got %v, expected %v", p.ID(), id) } if p.Name() != name { t.Errorf("Name mismatch: got %v, expected %v", p.Name(), name) } if !reflect.DeepEqual(p.Caps(), caps) { t.Errorf("Caps mismatch: got %v, expected %v", p.Caps(), caps) } p.Disconnect(DiscAlreadyConnected) // Should not hang }