// writeMessage sends a bitcoin Message to the peer with logging.
func (p *peer) writeMessage(msg btcwire.Message) {
// Don't do anything if we're disconnecting.
if atomic.LoadInt32(&p.disconnect) != 0 {
return
}
log.Debugf("[PEER] Sending command [%v] to %s", msg.Command(),
p.addr)
// Use closures to log expensive operations so they are only run when the
// logging level requires it.
log.Tracef("%v", newLogClosure(func() string {
return "[PEER] msg" + spew.Sdump(msg)
}))
log.Tracef("%v", newLogClosure(func() string {
var buf bytes.Buffer
err := btcwire.WriteMessage(&buf, msg, p.protocolVersion, p.btcnet)
if err != nil {
return err.Error()
}
return "[PEER] " + spew.Sdump(buf.Bytes())
}))
// Write the message to the peer.
err := btcwire.WriteMessage(p.conn, msg, p.protocolVersion, p.btcnet)
if err != nil {
p.Disconnect()
p.logError("[PEER] Can't send message: %v", err)
return
}
}
// TestWriteMessageWireErrors performs negative tests against wire encoding from
// concrete messages to confirm error paths work correctly.
func TestWriteMessageWireErrors(t *testing.T) {
pver := btcwire.ProtocolVersion
btcnet := btcwire.MainNet
btcwireErr := &btcwire.MessageError{}
// Fake message with a command that is too long.
badCommandMsg := &fakeMessage{command: "somethingtoolong"}
// Fake message with a problem during encoding
encodeErrMsg := &fakeMessage{forceEncodeErr: true}
// Fake message that has a payload which exceed max.
exceedPayload := make([]byte, btcwire.MaxMessagePayload+1)
exceedPayloadErrMsg := &fakeMessage{payload: exceedPayload}
bogusPayload := []byte{0x01, 0x02, 0x03, 0x04}
bogusMsg := &fakeMessage{command: "bogus", payload: bogusPayload}
tests := []struct {
msg btcwire.Message // Message to encode
pver uint32 // Protocol version for wire encoding
btcnet btcwire.BitcoinNet // Bitcoin network for wire encoding
max int // Max size of fixed buffer to induce errors
err error // Expected error
}{
// Command too long.
{badCommandMsg, pver, btcnet, 0, btcwireErr},
// Force error in payload encode.
{encodeErrMsg, pver, btcnet, 0, btcwireErr},
// Force error due to exceeding max payload size.
{exceedPayloadErrMsg, pver, btcnet, 0, btcwireErr},
// Force error in header write.
{bogusMsg, pver, btcnet, 0, io.ErrShortWrite},
// Force error in payload write.
{bogusMsg, pver, btcnet, 24, io.ErrShortWrite},
}
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
// Encode wire format.
w := newFixedWriter(test.max)
err := btcwire.WriteMessage(w, test.msg, test.pver, test.btcnet)
if reflect.TypeOf(err) != reflect.TypeOf(test.err) {
t.Errorf("WriteMessage #%d wrong error got: %v <%T>, "+
"want: %T", i, err, err, test.err)
continue
}
// For errors which are not of type btcwire.MessageError, check
// them for equality.
if _, ok := err.(*btcwire.MessageError); !ok {
if err != test.err {
t.Errorf("ReadMessage #%d wrong error got: %v <%T>, "+
"want: %v <%T>", i, err, err,
test.err, test.err)
continue
}
}
}
}
// Creates the reading and writing interfaces used to send and recieve messages
// from a Bitcoin peer. inSetup indicates the verbosity of the failure mode.
func composeConnOuts(params connParams) (func() btcwire.Message, func(btcwire.Message)) {
conn := params.conn
logger := params.logger
failmsg := "The Bitcoin server has reached its max peers and does not want to talk"
read := func() btcwire.Message {
msg, _, err := btcwire.ReadMessage(conn, params.pver, params.btcnet)
// a Bitcoin node will typically send a TCP RST if it doesn't want to talk
if params.insetup && err != nil {
logger.Printf(failmsg)
}
if err != nil {
logger.Fatal(err)
}
return msg
}
write := func(msg btcwire.Message) {
err := btcwire.WriteMessage(conn, msg, params.pver, params.btcnet)
if params.insetup && err != nil {
logger.Printf(failmsg)
}
if err != nil {
logger.Fatal(err)
}
}
return read, write
}
// writeMessage sends a bitcoin Message to the peer with logging.
func (p *peer) writeMessage(msg btcwire.Message) {
// Don't do anything if we're disconnecting.
if atomic.LoadInt32(&p.disconnect) != 0 {
return
}
if !p.versionKnown {
switch msg.(type) {
case *btcwire.MsgVersion:
// This is OK.
default:
// We drop all messages other than version if we
// haven't done the handshake already.
return
}
}
// Use closures to log expensive operations so they are only run when
// the logging level requires it.
log.Debugf("%v", newLogClosure(func() string {
// Debug summary of message.
summary := messageSummary(msg)
if len(summary) > 0 {
summary = " (" + summary + ")"
}
return fmt.Sprintf("PEER: Sending %v%s to %s", msg.Command(),
summary, p.addr)
}))
log.Tracef("%v", newLogClosure(func() string {
return "PEER: " + spew.Sdump(msg)
}))
log.Tracef("%v", newLogClosure(func() string {
var buf bytes.Buffer
err := btcwire.WriteMessage(&buf, msg, p.protocolVersion, p.btcnet)
if err != nil {
return err.Error()
}
return "PEER: " + spew.Sdump(buf.Bytes())
}))
// Write the message to the peer.
err := btcwire.WriteMessage(p.conn, msg, p.protocolVersion, p.btcnet)
if err != nil {
p.Disconnect()
p.logError("PEER: Can't send message: %v", err)
return
}
}
func (peer *Peer) WriteMessage(msg btcwire.Message) {
err := btcwire.WriteMessage(peer.conn, msg, peer.version, peer.btcnet)
if err != nil {
fmt.Println("Error writing message %v", err)
return
}
}
func composeWrite(threadLog func(LogLevel, string), pver uint32) func(net.Conn, btc.Message) {
// creates a write function with logging in a closure
return func(conn net.Conn, msg btc.Message) {
err := btc.WriteMessage(conn, msg, pver, btcnet)
if err != nil {
threadLog(Info, err.Error())
}
}
}
// TestMessage tests the Read/WriteMessage API.
func TestMessage(t *testing.T) {
pver := btcwire.ProtocolVersion
// Create the various types of messages to test.
// MsgVersion.
addrYou := &net.TCPAddr{IP: net.ParseIP("192.168.0.1"), Port: 8333}
you, err := btcwire.NewNetAddress(addrYou, btcwire.SFNodeNetwork)
if err != nil {
t.Errorf("NewNetAddress: %v", err)
}
you.Timestamp = time.Time{} // Version message has zero value timestamp.
addrMe := &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 8333}
me, err := btcwire.NewNetAddress(addrMe, btcwire.SFNodeNetwork)
if err != nil {
t.Errorf("NewNetAddress: %v", err)
}
me.Timestamp = time.Time{} // Version message has zero value timestamp.
msgVersion := btcwire.NewMsgVersion(me, you, 123123, "/test:0.0.1/", 0)
msgVerack := btcwire.NewMsgVerAck()
msgGetAddr := btcwire.NewMsgGetAddr()
msgAddr := btcwire.NewMsgAddr()
msgGetBlocks := btcwire.NewMsgGetBlocks(&btcwire.ShaHash{})
msgBlock := &blockOne
msgInv := btcwire.NewMsgInv()
msgGetData := btcwire.NewMsgGetData()
msgNotFound := btcwire.NewMsgNotFound()
msgTx := btcwire.NewMsgTx()
msgPing := btcwire.NewMsgPing(123123)
msgPong := btcwire.NewMsgPong(123123)
msgGetHeaders := btcwire.NewMsgGetHeaders()
msgHeaders := btcwire.NewMsgHeaders()
msgAlert := btcwire.NewMsgAlert("payload", "signature")
msgMemPool := btcwire.NewMsgMemPool()
tests := []struct {
in btcwire.Message // Value to encode
out btcwire.Message // Expected decoded value
pver uint32 // Protocol version for wire encoding
btcnet btcwire.BitcoinNet // Network to use for wire encoding
}{
{msgVersion, msgVersion, pver, btcwire.MainNet},
{msgVerack, msgVerack, pver, btcwire.MainNet},
{msgGetAddr, msgGetAddr, pver, btcwire.MainNet},
{msgAddr, msgAddr, pver, btcwire.MainNet},
{msgGetBlocks, msgGetBlocks, pver, btcwire.MainNet},
{msgBlock, msgBlock, pver, btcwire.MainNet},
{msgInv, msgInv, pver, btcwire.MainNet},
{msgGetData, msgGetData, pver, btcwire.MainNet},
{msgNotFound, msgNotFound, pver, btcwire.MainNet},
{msgTx, msgTx, pver, btcwire.MainNet},
{msgPing, msgPing, pver, btcwire.MainNet},
{msgPong, msgPong, pver, btcwire.MainNet},
{msgGetHeaders, msgGetHeaders, pver, btcwire.MainNet},
{msgHeaders, msgHeaders, pver, btcwire.MainNet},
{msgAlert, msgAlert, pver, btcwire.MainNet},
{msgMemPool, msgMemPool, pver, btcwire.MainNet},
}
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
// Encode to wire format.
var buf bytes.Buffer
err := btcwire.WriteMessage(&buf, test.in, test.pver, test.btcnet)
if err != nil {
t.Errorf("WriteMessage #%d error %v", i, err)
continue
}
// Decode from wire format.
rbuf := bytes.NewBuffer(buf.Bytes())
msg, _, err := btcwire.ReadMessage(rbuf, test.pver, test.btcnet)
if err != nil {
t.Errorf("ReadMessage #%d error %v, msg %v", i, err,
spew.Sdump(msg))
continue
}
if !reflect.DeepEqual(msg, test.out) {
t.Errorf("ReadMessage #%d\n got: %v want: %v", i,
spew.Sdump(msg), spew.Sdump(test.out))
continue
}
}
}