package p2p
import (
"bytes"
"fmt"
"io/ioutil"
"net"
"reflect"
"testing"
"time"
"github.com/ethereum/go-ethereum/rlp"
)
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) (*conn, *Peer, <-chan DiscReason) {
fd1, fd2 := 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())
}
peer := newPeer(newConn(fd1, hs1), protos)
errc := make(chan DiscReason, 1)
go func() { errc <- peer.run() }()
return newConn(fd2, 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
},
}
rw, _, errc := testPeer([]Protocol{proto})
defer rw.Close()
EncodeMsg(rw, baseProtocolLength+2, 1)
EncodeMsg(rw, baseProtocolLength+3, 2)
EncodeMsg(rw, baseProtocolLength+4, 3)
select {
case <-done:
case err := <-errc:
t.Errorf("peer returned: %v", err)
case <-time.After(2 * time.Second):
t.Errorf("receive timeout")
}
}
func TestPeerProtoReadLargeMsg(t *testing.T) {
defer testlog(t).detach()
msgsize := uint32(10 * 1024 * 1024)
done := make(chan struct{})
proto := Protocol{
Name: "a",
Length: 5,
Run: func(peer *Peer, rw MsgReadWriter) error {
msg, err := rw.ReadMsg()
if err != nil {
t.Errorf("read error: %v", err)
}
if msg.Size != msgsize+4 {
t.Errorf("incorrect msg.Size, got %d, expected %d", msg.Size, msgsize)
}
msg.Discard()
close(done)
return nil
},
}
rw, _, errc := testPeer([]Protocol{proto})
defer rw.Close()
EncodeMsg(rw, 18, make([]byte, msgsize))
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 := EncodeMsg(rw, 2); err == nil {
t.Error("expected error for out-of-range msg code, got nil")
}
if err := EncodeMsg(rw, 1, "foo", "bar"); err != nil {
t.Errorf("write error: %v", err)
}
return nil
},
}
rw, _, _ := testPeer([]Protocol{proto})
defer rw.Close()
if err := expectMsg(rw, 17, []string{"foo", "bar"}); err != nil {
t.Error(err)
}
}
func TestPeerWriteForBroadcast(t *testing.T) {
defer testlog(t).detach()
rw, peer, peerErr := testPeer([]Protocol{discard})
defer rw.Close()
// test write errors
if err := peer.writeProtoMsg("b", NewMsg(3)); err == nil {
t.Errorf("expected error for unknown protocol, got nil")
}
if err := peer.writeProtoMsg("discard", NewMsg(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", NewMsg(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()
rw, _, _ := testPeer(nil)
defer rw.Close()
if err := EncodeMsg(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()
rw, _, disc := testPeer(nil)
defer rw.Close()
if err := EncodeMsg(rw, discMsg, DiscQuitting); err != nil {
t.Fatal(err)
}
if err := expectMsg(rw, discMsg, []interface{}{DiscRequested}); err != nil {
t.Error(err)
}
rw.Close() // make test end faster
if reason := <-disc; reason != DiscRequested {
t.Errorf("run returned wrong reason: got %v, want %v", reason, DiscRequested)
}
}
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
}
// expectMsg reads a message from r and verifies that its
// code and encoded RLP content match the provided values.
// If content is nil, the payload is discarded and not verified.
func expectMsg(r MsgReader, code uint64, content interface{}) error {
msg, err := r.ReadMsg()
if err != nil {
return err
}
if msg.Code != code {
return fmt.Errorf("message code mismatch: got %d, expected %d", msg.Code, code)
}
if content == nil {
return msg.Discard()
} else {
contentEnc, err := rlp.EncodeToBytes(content)
if err != nil {
panic("content encode error: " + err.Error())
}
// skip over list header in encoded value. this is temporary.
contentEncR := bytes.NewReader(contentEnc)
if k, _, err := rlp.NewStream(contentEncR).Kind(); k != rlp.List || err != nil {
panic("content must encode as RLP list")
}
contentEnc = contentEnc[len(contentEnc)-contentEncR.Len():]
actualContent, err := ioutil.ReadAll(msg.Payload)
if err != nil {
return err
}
if !bytes.Equal(actualContent, contentEnc) {
return fmt.Errorf("message payload mismatch:\ngot: %x\nwant: %x", actualContent, contentEnc)
}
}
return nil
}
