diff --git a/p2p/client_identity.go b/p2p/client_identity.go
index 236b23106..bc865b63b 100644
--- a/p2p/client_identity.go
+++ b/p2p/client_identity.go
@@ -5,10 +5,10 @@ import (
"runtime"
)
-// should be used in Peer handleHandshake, incorporate Caps, ProtocolVersion, Pubkey etc.
+// ClientIdentity represents the identity of a peer.
type ClientIdentity interface {
- String() string
- Pubkey() []byte
+ String() string // human readable identity
+ Pubkey() []byte // 512-bit public key
}
type SimpleClientIdentity struct {
diff --git a/p2p/connection.go b/p2p/connection.go
deleted file mode 100644
index be366235d..000000000
--- a/p2p/connection.go
+++ /dev/null
@@ -1,275 +0,0 @@
-package p2p
-
-import (
- "bytes"
- // "fmt"
- "net"
- "time"
-
- "github.com/ethereum/go-ethereum/ethutil"
-)
-
-type Connection struct {
- conn net.Conn
- // conn NetworkConnection
- timeout time.Duration
- in chan []byte
- out chan []byte
- err chan *PeerError
- closingIn chan chan bool
- closingOut chan chan bool
-}
-
-// const readBufferLength = 2 //for testing
-
-const readBufferLength = 1440
-const partialsQueueSize = 10
-const maxPendingQueueSize = 1
-const defaultTimeout = 500
-
-var magicToken = []byte{34, 64, 8, 145}
-
-func (self *Connection) Open() {
- go self.startRead()
- go self.startWrite()
-}
-
-func (self *Connection) Close() {
- self.closeIn()
- self.closeOut()
-}
-
-func (self *Connection) closeIn() {
- errc := make(chan bool)
- self.closingIn <- errc
- <-errc
-}
-
-func (self *Connection) closeOut() {
- errc := make(chan bool)
- self.closingOut <- errc
- <-errc
-}
-
-func NewConnection(conn net.Conn, errchan chan *PeerError) *Connection {
- return &Connection{
- conn: conn,
- timeout: defaultTimeout,
- in: make(chan []byte),
- out: make(chan []byte),
- err: errchan,
- closingIn: make(chan chan bool, 1),
- closingOut: make(chan chan bool, 1),
- }
-}
-
-func (self *Connection) Read() <-chan []byte {
- return self.in
-}
-
-func (self *Connection) Write() chan<- []byte {
- return self.out
-}
-
-func (self *Connection) Error() <-chan *PeerError {
- return self.err
-}
-
-func (self *Connection) startRead() {
- payloads := make(chan []byte)
- done := make(chan *PeerError)
- pending := [][]byte{}
- var head []byte
- var wait time.Duration // initally 0 (no delay)
- read := time.After(wait * time.Millisecond)
-
- for {
- // if pending empty, nil channel blocks
- var in chan []byte
- if len(pending) > 0 {
- in = self.in // enable send case
- head = pending[0]
- } else {
- in = nil
- }
-
- select {
- case <-read:
- go self.read(payloads, done)
- case err := <-done:
- if err == nil { // no error but nothing to read
- if len(pending) < maxPendingQueueSize {
- wait = 100
- } else if wait == 0 {
- wait = 100
- } else {
- wait = 2 * wait
- }
- } else {
- self.err <- err // report error
- wait = 100
- }
- read = time.After(wait * time.Millisecond)
- case payload := <-payloads:
- pending = append(pending, payload)
- if len(pending) < maxPendingQueueSize {
- wait = 0
- } else {
- wait = 100
- }
- read = time.After(wait * time.Millisecond)
- case in <- head:
- pending = pending[1:]
- case errc := <-self.closingIn:
- errc <- true
- close(self.in)
- return
- }
-
- }
-}
-
-func (self *Connection) startWrite() {
- pending := [][]byte{}
- done := make(chan *PeerError)
- writing := false
- for {
- if len(pending) > 0 && !writing {
- writing = true
- go self.write(pending[0], done)
- }
- select {
- case payload := <-self.out:
- pending = append(pending, payload)
- case err := <-done:
- if err == nil {
- pending = pending[1:]
- writing = false
- } else {
- self.err <- err // report error
- }
- case errc := <-self.closingOut:
- errc <- true
- close(self.out)
- return
- }
- }
-}
-
-func pack(payload []byte) (packet []byte) {
- length := ethutil.NumberToBytes(uint32(len(payload)), 32)
- // return error if too long?
- // Write magic token and payload length (first 8 bytes)
- packet = append(magicToken, length...)
- packet = append(packet, payload...)
- return
-}
-
-func avoidPanic(done chan *PeerError) {
- if rec := recover(); rec != nil {
- err := NewPeerError(MiscError, " %v", rec)
- logger.Debugln(err)
- done <- err
- }
-}
-
-func (self *Connection) write(payload []byte, done chan *PeerError) {
- defer avoidPanic(done)
- var err *PeerError
- _, ok := self.conn.Write(pack(payload))
- if ok != nil {
- err = NewPeerError(WriteError, " %v", ok)
- logger.Debugln(err)
- }
- done <- err
-}
-
-func (self *Connection) read(payloads chan []byte, done chan *PeerError) {
- //defer avoidPanic(done)
-
- partials := make(chan []byte, partialsQueueSize)
- errc := make(chan *PeerError)
- go self.readPartials(partials, errc)
-
- packet := []byte{}
- length := 8
- start := true
- var err *PeerError
-out:
- for {
- // appends partials read via connection until packet is
- // - either parseable (>=8bytes)
- // - or complete (payload fully consumed)
- for len(packet) < length {
- partial, ok := <-partials
- if !ok { // partials channel is closed
- err = <-errc
- if err == nil && len(packet) > 0 {
- if start {
- err = NewPeerError(PacketTooShort, "%v", packet)
- } else {
- err = NewPeerError(PayloadTooShort, "%d < %d", len(packet), length)
- }
- }
- break out
- }
- packet = append(packet, partial...)
- }
- if start {
- // at least 8 bytes read, can validate packet
- if bytes.Compare(magicToken, packet[:4]) != 0 {
- err = NewPeerError(MagicTokenMismatch, " received %v", packet[:4])
- break
- }
- length = int(ethutil.BytesToNumber(packet[4:8]))
- packet = packet[8:]
-
- if length > 0 {
- start = false // now consuming payload
- } else { //penalize peer but read on
- self.err <- NewPeerError(EmptyPayload, "")
- length = 8
- }
- } else {
- // packet complete (payload fully consumed)
- payloads <- packet[:length]
- packet = packet[length:] // resclice packet
- start = true
- length = 8
- }
- }
-
- // this stops partials read via the connection, should we?
- //if err != nil {
- // select {
- // case errc <- err
- // default:
- //}
- done <- err
-}
-
-func (self *Connection) readPartials(partials chan []byte, errc chan *PeerError) {
- defer close(partials)
- for {
- // Give buffering some time
- self.conn.SetReadDeadline(time.Now().Add(self.timeout * time.Millisecond))
- buffer := make([]byte, readBufferLength)
- // read partial from connection
- bytesRead, err := self.conn.Read(buffer)
- if err == nil || err.Error() == "EOF" {
- if bytesRead > 0 {
- partials <- buffer[:bytesRead]
- }
- if err != nil && err.Error() == "EOF" {
- break
- }
- } else {
- // unexpected error, report to errc
- err := NewPeerError(ReadError, " %v", err)
- logger.Debugln(err)
- errc <- err
- return // will close partials channel
- }
- }
- close(errc)
-}
diff --git a/p2p/connection_test.go b/p2p/connection_test.go
deleted file mode 100644
index 76ee8021c..000000000
--- a/p2p/connection_test.go
+++ /dev/null
@@ -1,222 +0,0 @@
-package p2p
-
-import (
- "bytes"
- "fmt"
- "io"
- "net"
- "testing"
- "time"
-)
-
-type TestNetworkConnection struct {
- in chan []byte
- current []byte
- Out [][]byte
- addr net.Addr
-}
-
-func NewTestNetworkConnection(addr net.Addr) *TestNetworkConnection {
- return &TestNetworkConnection{
- in: make(chan []byte),
- current: []byte{},
- Out: [][]byte{},
- addr: addr,
- }
-}
-
-func (self *TestNetworkConnection) In(latency time.Duration, packets ...[]byte) {
- time.Sleep(latency)
- for _, s := range packets {
- self.in <- s
- }
-}
-
-func (self *TestNetworkConnection) Read(buff []byte) (n int, err error) {
- if len(self.current) == 0 {
- select {
- case self.current = <-self.in:
- default:
- return 0, io.EOF
- }
- }
- length := len(self.current)
- if length > len(buff) {
- copy(buff[:], self.current[:len(buff)])
- self.current = self.current[len(buff):]
- return len(buff), nil
- } else {
- copy(buff[:length], self.current[:])
- self.current = []byte{}
- return length, io.EOF
- }
-}
-
-func (self *TestNetworkConnection) Write(buff []byte) (n int, err error) {
- self.Out = append(self.Out, buff)
- fmt.Printf("net write %v\n%v\n", len(self.Out), buff)
- return len(buff), nil
-}
-
-func (self *TestNetworkConnection) Close() (err error) {
- return
-}
-
-func (self *TestNetworkConnection) LocalAddr() (addr net.Addr) {
- return
-}
-
-func (self *TestNetworkConnection) RemoteAddr() (addr net.Addr) {
- return self.addr
-}
-
-func (self *TestNetworkConnection) SetDeadline(t time.Time) (err error) {
- return
-}
-
-func (self *TestNetworkConnection) SetReadDeadline(t time.Time) (err error) {
- return
-}
-
-func (self *TestNetworkConnection) SetWriteDeadline(t time.Time) (err error) {
- return
-}
-
-func setupConnection() (*Connection, *TestNetworkConnection) {
- addr := &TestAddr{"test:30303"}
- net := NewTestNetworkConnection(addr)
- conn := NewConnection(net, NewPeerErrorChannel())
- conn.Open()
- return conn, net
-}
-
-func TestReadingNilPacket(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{})
- // time.Sleep(10 * time.Millisecond)
- select {
- case packet := <-conn.Read():
- t.Errorf("read %v", packet)
- case err := <-conn.Error():
- t.Errorf("incorrect error %v", err)
- default:
- }
- conn.Close()
-}
-
-func TestReadingShortPacket(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{0})
- select {
- case packet := <-conn.Read():
- t.Errorf("read %v", packet)
- case err := <-conn.Error():
- if err.Code != PacketTooShort {
- t.Errorf("incorrect error %v, expected %v", err.Code, PacketTooShort)
- }
- }
- conn.Close()
-}
-
-func TestReadingInvalidPacket(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{1, 0, 0, 0, 0, 0, 0, 0})
- select {
- case packet := <-conn.Read():
- t.Errorf("read %v", packet)
- case err := <-conn.Error():
- if err.Code != MagicTokenMismatch {
- t.Errorf("incorrect error %v, expected %v", err.Code, MagicTokenMismatch)
- }
- }
- conn.Close()
-}
-
-func TestReadingInvalidPayload(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 2, 0})
- select {
- case packet := <-conn.Read():
- t.Errorf("read %v", packet)
- case err := <-conn.Error():
- if err.Code != PayloadTooShort {
- t.Errorf("incorrect error %v, expected %v", err.Code, PayloadTooShort)
- }
- }
- conn.Close()
-}
-
-func TestReadingEmptyPayload(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 0})
- time.Sleep(10 * time.Millisecond)
- select {
- case packet := <-conn.Read():
- t.Errorf("read %v", packet)
- default:
- }
- select {
- case err := <-conn.Error():
- code := err.Code
- if code != EmptyPayload {
- t.Errorf("incorrect error, expected EmptyPayload, got %v", code)
- }
- default:
- t.Errorf("no error, expected EmptyPayload")
- }
- conn.Close()
-}
-
-func TestReadingCompletePacket(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 1, 1})
- time.Sleep(10 * time.Millisecond)
- select {
- case packet := <-conn.Read():
- if bytes.Compare(packet, []byte{1}) != 0 {
- t.Errorf("incorrect payload read")
- }
- case err := <-conn.Error():
- t.Errorf("incorrect error %v", err)
- default:
- t.Errorf("nothing read")
- }
- conn.Close()
-}
-
-func TestReadingTwoCompletePackets(t *testing.T) {
- conn, net := setupConnection()
- go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 1, 0, 34, 64, 8, 145, 0, 0, 0, 1, 1})
-
- for i := 0; i < 2; i++ {
- time.Sleep(10 * time.Millisecond)
- select {
- case packet := <-conn.Read():
- if bytes.Compare(packet, []byte{byte(i)}) != 0 {
- t.Errorf("incorrect payload read")
- }
- case err := <-conn.Error():
- t.Errorf("incorrect error %v", err)
- default:
- t.Errorf("nothing read")
- }
- }
- conn.Close()
-}
-
-func TestWriting(t *testing.T) {
- conn, net := setupConnection()
- conn.Write() <- []byte{0}
- time.Sleep(10 * time.Millisecond)
- if len(net.Out) == 0 {
- t.Errorf("no output")
- } else {
- out := net.Out[0]
- if bytes.Compare(out, []byte{34, 64, 8, 145, 0, 0, 0, 1, 0}) != 0 {
- t.Errorf("incorrect packet %v", out)
- }
- }
- conn.Close()
-}
-
-// hello packet with client id ABC: 0x22 40 08 91 00 00 00 08 84 00 00 00 43414243
diff --git a/p2p/message.go b/p2p/message.go
index 446e74dff..d3b8b74d4 100644
--- a/p2p/message.go
+++ b/p2p/message.go
@@ -1,75 +1,155 @@
package p2p
import (
- // "fmt"
+ "bytes"
+ "encoding/binary"
+ "io"
+ "io/ioutil"
+ "math/big"
+
"github.com/ethereum/go-ethereum/ethutil"
+ "github.com/ethereum/go-ethereum/rlp"
)
-type MsgCode uint8
-
+// Msg defines the structure of a p2p message.
+//
+// Note that a Msg can only be sent once since the Payload reader is
+// consumed during sending. It is not possible to create a Msg and
+// send it any number of times. If you want to reuse an encoded
+// structure, encode the payload into a byte array and create a
+// separate Msg with a bytes.Reader as Payload for each send.
type Msg struct {
- code MsgCode // this is the raw code as per adaptive msg code scheme
- data *ethutil.Value
- encoded []byte
+ Code uint64
+ Size uint32 // size of the paylod
+ Payload io.Reader
}
-func (self *Msg) Code() MsgCode {
- return self.code
-}
-
-func (self *Msg) Data() *ethutil.Value {
- return self.data
-}
-
-func NewMsg(code MsgCode, params ...interface{}) (msg *Msg, err error) {
-
- // // data := [][]interface{}{}
- // data := []interface{}{}
- // for _, value := range params {
- // if encodable, ok := value.(ethutil.RlpEncodeDecode); ok {
- // data = append(data, encodable.RlpValue())
- // } else if raw, ok := value.([]interface{}); ok {
- // data = append(data, raw)
- // } else {
- // // data = append(data, interface{}(raw))
- // err = fmt.Errorf("Unable to encode object of type %T", value)
- // return
- // }
- // }
- return &Msg{
- code: code,
- data: ethutil.NewValue(interface{}(params)),
- }, nil
-}
-
-func NewMsgFromBytes(encoded []byte) (msg *Msg, err error) {
- value := ethutil.NewValueFromBytes(encoded)
- // Type of message
- code := value.Get(0).Uint()
- // Actual data
- data := value.SliceFrom(1)
-
- msg = &Msg{
- code: MsgCode(code),
- data: data,
- // data: ethutil.NewValue(data),
- encoded: encoded,
+// NewMsg creates an RLP-encoded message with the given code.
+func NewMsg(code uint64, params ...interface{}) Msg {
+ buf := new(bytes.Buffer)
+ for _, p := range params {
+ buf.Write(ethutil.Encode(p))
}
- return
+ return Msg{Code: code, Size: uint32(buf.Len()), Payload: buf}
}
-func (self *Msg) Decode(offset MsgCode) {
- self.code = self.code - offset
-}
-
-// encode takes an offset argument to implement adaptive message coding
-// the encoded message is memoized to make msgs relayed to several peers more efficient
-func (self *Msg) Encode(offset MsgCode) (res []byte) {
- if len(self.encoded) == 0 {
- res = ethutil.NewValue(append([]interface{}{byte(self.code + offset)}, self.data.Slice()...)).Encode()
- self.encoded = res
- } else {
- res = self.encoded
+func encodePayload(params ...interface{}) []byte {
+ buf := new(bytes.Buffer)
+ for _, p := range params {
+ buf.Write(ethutil.Encode(p))
}
- return
+ return buf.Bytes()
+}
+
+// Decode parse the RLP content of a message into
+// the given value, which must be a pointer.
+//
+// For the decoding rules, please see package rlp.
+func (msg Msg) Decode(val interface{}) error {
+ s := rlp.NewListStream(msg.Payload, uint64(msg.Size))
+ return s.Decode(val)
+}
+
+// Discard reads any remaining payload data into a black hole.
+func (msg Msg) Discard() error {
+ _, err := io.Copy(ioutil.Discard, msg.Payload)
+ return err
+}
+
+type MsgReader interface {
+ ReadMsg() (Msg, error)
+}
+
+type MsgWriter interface {
+ // WriteMsg sends an existing message.
+ // The Payload reader of the message is consumed.
+ // Note that messages can be sent only once.
+ WriteMsg(Msg) error
+
+ // EncodeMsg writes an RLP-encoded message with the given
+ // code and data elements.
+ EncodeMsg(code uint64, data ...interface{}) error
+}
+
+// MsgReadWriter provides reading and writing of encoded messages.
+type MsgReadWriter interface {
+ MsgReader
+ MsgWriter
+}
+
+var magicToken = []byte{34, 64, 8, 145}
+
+func writeMsg(w io.Writer, msg Msg) error {
+ // TODO: handle case when Size + len(code) + len(listhdr) overflows uint32
+ code := ethutil.Encode(uint32(msg.Code))
+ listhdr := makeListHeader(msg.Size + uint32(len(code)))
+ payloadLen := uint32(len(listhdr)) + uint32(len(code)) + msg.Size
+
+ start := make([]byte, 8)
+ copy(start, magicToken)
+ binary.BigEndian.PutUint32(start[4:], payloadLen)
+
+ for _, b := range [][]byte{start, listhdr, code} {
+ if _, err := w.Write(b); err != nil {
+ return err
+ }
+ }
+ _, err := io.CopyN(w, msg.Payload, int64(msg.Size))
+ return err
+}
+
+func makeListHeader(length uint32) []byte {
+ if length < 56 {
+ return []byte{byte(length + 0xc0)}
+ }
+ enc := big.NewInt(int64(length)).Bytes()
+ lenb := byte(len(enc)) + 0xf7
+ return append([]byte{lenb}, enc...)
+}
+
+// readMsg reads a message header from r.
+// It takes an rlp.ByteReader to ensure that the decoding doesn't buffer.
+func readMsg(r rlp.ByteReader) (msg Msg, err error) {
+ // read magic and payload size
+ start := make([]byte, 8)
+ if _, err = io.ReadFull(r, start); err != nil {
+ return msg, newPeerError(errRead, "%v", err)
+ }
+ if !bytes.HasPrefix(start, magicToken) {
+ return msg, newPeerError(errMagicTokenMismatch, "got %x, want %x", start[:4], magicToken)
+ }
+ size := binary.BigEndian.Uint32(start[4:])
+
+ // decode start of RLP message to get the message code
+ posr := &postrack{r, 0}
+ s := rlp.NewStream(posr)
+ if _, err := s.List(); err != nil {
+ return msg, err
+ }
+ code, err := s.Uint()
+ if err != nil {
+ return msg, err
+ }
+ payloadsize := size - posr.p
+ return Msg{code, payloadsize, io.LimitReader(r, int64(payloadsize))}, nil
+}
+
+// postrack wraps an rlp.ByteReader with a position counter.
+type postrack struct {
+ r rlp.ByteReader
+ p uint32
+}
+
+func (r *postrack) Read(buf []byte) (int, error) {
+ n, err := r.r.Read(buf)
+ r.p += uint32(n)
+ return n, err
+}
+
+func (r *postrack) ReadByte() (byte, error) {
+ b, err := r.r.ReadByte()
+ if err == nil {
+ r.p++
+ }
+ return b, err
}
diff --git a/p2p/message_test.go b/p2p/message_test.go
index e9d46f2c3..7b39b061d 100644
--- a/p2p/message_test.go
+++ b/p2p/message_test.go
@@ -1,38 +1,70 @@
package p2p
import (
+ "bytes"
+ "io/ioutil"
"testing"
+
+ "github.com/ethereum/go-ethereum/ethutil"
)
func TestNewMsg(t *testing.T) {
- msg, _ := NewMsg(3, 1, "000")
- if msg.Code() != 3 {
- t.Errorf("incorrect code %v", msg.Code())
+ msg := NewMsg(3, 1, "000")
+ if msg.Code != 3 {
+ t.Errorf("incorrect code %d, want %d", msg.Code)
}
- data0 := msg.Data().Get(0).Uint()
- data1 := string(msg.Data().Get(1).Bytes())
- if data0 != 1 {
- t.Errorf("incorrect data %v", data0)
+ if msg.Size != 5 {
+ t.Errorf("incorrect size %d, want %d", msg.Size, 5)
}
- if data1 != "000" {
- t.Errorf("incorrect data %v", data1)
+ pl, _ := ioutil.ReadAll(msg.Payload)
+ expect := []byte{0x01, 0x83, 0x30, 0x30, 0x30}
+ if !bytes.Equal(pl, expect) {
+ t.Errorf("incorrect payload content, got %x, want %x", pl, expect)
}
}
func TestEncodeDecodeMsg(t *testing.T) {
- msg, _ := NewMsg(3, 1, "000")
- encoded := msg.Encode(3)
- msg, _ = NewMsgFromBytes(encoded)
- msg.Decode(3)
- if msg.Code() != 3 {
- t.Errorf("incorrect code %v", msg.Code())
+ msg := NewMsg(3, 1, "000")
+ buf := new(bytes.Buffer)
+ if err := writeMsg(buf, msg); err != nil {
+ t.Fatalf("encodeMsg error: %v", err)
}
- data0 := msg.Data().Get(0).Uint()
- data1 := msg.Data().Get(1).Str()
- if data0 != 1 {
- t.Errorf("incorrect data %v", data0)
+ // t.Logf("encoded: %x", buf.Bytes())
+
+ decmsg, err := readMsg(buf)
+ if err != nil {
+ t.Fatalf("readMsg error: %v", err)
}
- if data1 != "000" {
- t.Errorf("incorrect data %v", data1)
+ if decmsg.Code != 3 {
+ t.Errorf("incorrect code %d, want %d", decmsg.Code, 3)
+ }
+ if decmsg.Size != 5 {
+ t.Errorf("incorrect size %d, want %d", decmsg.Size, 5)
+ }
+
+ var data struct {
+ I int
+ S string
+ }
+ if err := decmsg.Decode(&data); err != nil {
+ t.Fatalf("Decode error: %v", err)
+ }
+ if data.I != 1 {
+ t.Errorf("incorrect data.I: got %v, expected %d", data.I, 1)
+ }
+ if data.S != "000" {
+ t.Errorf("incorrect data.S: got %q, expected %q", data.S, "000")
+ }
+}
+
+func TestDecodeRealMsg(t *testing.T) {
+ data := ethutil.Hex2Bytes("2240089100000080f87e8002b5457468657265756d282b2b292f5065657220536572766572204f6e652f76302e372e382f52656c656173652f4c696e75782f672b2bc082765fb84086dd80b7aefd6a6d2e3b93f4f300a86bfb6ef7bdc97cb03f793db6bb")
+ msg, err := readMsg(bytes.NewReader(data))
+ if err != nil {
+ t.Fatalf("unexpected error: %v", err)
+ }
+
+ if msg.Code != 0 {
+ t.Errorf("incorrect code %d, want %d", msg.Code, 0)
}
}
diff --git a/p2p/messenger.go b/p2p/messenger.go
deleted file mode 100644
index d42ba1720..000000000
--- a/p2p/messenger.go
+++ /dev/null
@@ -1,220 +0,0 @@
-package p2p
-
-import (
- "fmt"
- "sync"
- "time"
-)
-
-const (
- handlerTimeout = 1000
-)
-
-type Handlers map[string](func(p *Peer) Protocol)
-
-type Messenger struct {
- conn *Connection
- peer *Peer
- handlers Handlers
- protocolLock sync.RWMutex
- protocols []Protocol
- offsets []MsgCode // offsets for adaptive message idss
- protocolTable map[string]int
- quit chan chan bool
- err chan *PeerError
- pulse chan bool
-}
-
-func NewMessenger(peer *Peer, conn *Connection, errchan chan *PeerError, handlers Handlers) *Messenger {
- baseProtocol := NewBaseProtocol(peer)
- return &Messenger{
- conn: conn,
- peer: peer,
- offsets: []MsgCode{baseProtocol.Offset()},
- handlers: handlers,
- protocols: []Protocol{baseProtocol},
- protocolTable: make(map[string]int),
- err: errchan,
- pulse: make(chan bool, 1),
- quit: make(chan chan bool, 1),
- }
-}
-
-func (self *Messenger) Start() {
- self.conn.Open()
- go self.messenger()
- self.protocolLock.RLock()
- defer self.protocolLock.RUnlock()
- self.protocols[0].Start()
-}
-
-func (self *Messenger) Stop() {
- // close pulse to stop ping pong monitoring
- close(self.pulse)
- self.protocolLock.RLock()
- defer self.protocolLock.RUnlock()
- for _, protocol := range self.protocols {
- protocol.Stop() // could be parallel
- }
- q := make(chan bool)
- self.quit <- q
- <-q
- self.conn.Close()
-}
-
-func (self *Messenger) messenger() {
- in := self.conn.Read()
- for {
- select {
- case payload, ok := <-in:
- //dispatches message to the protocol asynchronously
- if ok {
- go self.handle(payload)
- } else {
- return
- }
- case q := <-self.quit:
- q <- true
- return
- }
- }
-}
-
-// handles each message by dispatching to the appropriate protocol
-// using adaptive message codes
-// this function is started as a separate go routine for each message
-// it waits for the protocol response
-// then encodes and sends outgoing messages to the connection's write channel
-func (self *Messenger) handle(payload []byte) {
- // send ping to heartbeat channel signalling time of last message
- // select {
- // case self.pulse <- true:
- // default:
- // }
- self.pulse <- true
- // initialise message from payload
- msg, err := NewMsgFromBytes(payload)
- if err != nil {
- self.err <- NewPeerError(MiscError, " %v", err)
- return
- }
- // retrieves protocol based on message Code
- protocol, offset, peerErr := self.getProtocol(msg.Code())
- if err != nil {
- self.err <- peerErr
- return
- }
- // reset message code based on adaptive offset
- msg.Decode(offset)
- // dispatches
- response := make(chan *Msg)
- go protocol.HandleIn(msg, response)
- // protocol reponse timeout to prevent leaks
- timer := time.After(handlerTimeout * time.Millisecond)
- for {
- select {
- case outgoing, ok := <-response:
- // we check if response channel is not closed
- if ok {
- self.conn.Write() <- outgoing.Encode(offset)
- } else {
- return
- }
- case <-timer:
- return
- }
- }
-}
-
-// negotiated protocols
-// stores offsets needed for adaptive message id scheme
-
-// based on offsets set at handshake
-// get the right protocol to handle the message
-func (self *Messenger) getProtocol(code MsgCode) (Protocol, MsgCode, *PeerError) {
- self.protocolLock.RLock()
- defer self.protocolLock.RUnlock()
- base := MsgCode(0)
- for index, offset := range self.offsets {
- if code < offset {
- return self.protocols[index], base, nil
- }
- base = offset
- }
- return nil, MsgCode(0), NewPeerError(InvalidMsgCode, " %v", code)
-}
-
-func (self *Messenger) PingPong(timeout time.Duration, gracePeriod time.Duration, pingCallback func(), timeoutCallback func()) {
- fmt.Printf("pingpong keepalive started at %v", time.Now())
-
- timer := time.After(timeout)
- pinged := false
- for {
- select {
- case _, ok := <-self.pulse:
- if ok {
- pinged = false
- timer = time.After(timeout)
- } else {
- // pulse is closed, stop monitoring
- return
- }
- case <-timer:
- if pinged {
- fmt.Printf("timeout at %v", time.Now())
- timeoutCallback()
- return
- } else {
- fmt.Printf("pinged at %v", time.Now())
- pingCallback()
- timer = time.After(gracePeriod)
- pinged = true
- }
- }
- }
-}
-
-func (self *Messenger) AddProtocols(protocols []string) {
- self.protocolLock.Lock()
- defer self.protocolLock.Unlock()
- i := len(self.offsets)
- offset := self.offsets[i-1]
- for _, name := range protocols {
- protocolFunc, ok := self.handlers[name]
- if ok {
- protocol := protocolFunc(self.peer)
- self.protocolTable[name] = i
- i++
- offset += protocol.Offset()
- fmt.Println("offset ", name, offset)
-
- self.offsets = append(self.offsets, offset)
- self.protocols = append(self.protocols, protocol)
- protocol.Start()
- } else {
- fmt.Println("no ", name)
- // protocol not handled
- }
- }
-}
-
-func (self *Messenger) Write(protocol string, msg *Msg) error {
- self.protocolLock.RLock()
- defer self.protocolLock.RUnlock()
- i := 0
- offset := MsgCode(0)
- if len(protocol) > 0 {
- var ok bool
- i, ok = self.protocolTable[protocol]
- if !ok {
- return fmt.Errorf("protocol %v not handled by peer", protocol)
- }
- offset = self.offsets[i-1]
- }
- handler := self.protocols[i]
- // checking if protocol status/caps allows the message to be sent out
- if handler.HandleOut(msg) {
- self.conn.Write() <- msg.Encode(offset)
- }
- return nil
-}
diff --git a/p2p/messenger_test.go b/p2p/messenger_test.go
deleted file mode 100644
index 472d74515..000000000
--- a/p2p/messenger_test.go
+++ /dev/null
@@ -1,147 +0,0 @@
-package p2p
-
-import (
- // "fmt"
- "bytes"
- "testing"
- "time"
-
- "github.com/ethereum/go-ethereum/ethutil"
-)
-
-func setupMessenger(handlers Handlers) (*TestNetworkConnection, chan *PeerError, *Messenger) {
- errchan := NewPeerErrorChannel()
- addr := &TestAddr{"test:30303"}
- net := NewTestNetworkConnection(addr)
- conn := NewConnection(net, errchan)
- mess := NewMessenger(nil, conn, errchan, handlers)
- mess.Start()
- return net, errchan, mess
-}
-
-type TestProtocol struct {
- Msgs []*Msg
-}
-
-func (self *TestProtocol) Start() {
-}
-
-func (self *TestProtocol) Stop() {
-}
-
-func (self *TestProtocol) Offset() MsgCode {
- return MsgCode(5)
-}
-
-func (self *TestProtocol) HandleIn(msg *Msg, response chan *Msg) {
- self.Msgs = append(self.Msgs, msg)
- close(response)
-}
-
-func (self *TestProtocol) HandleOut(msg *Msg) bool {
- if msg.Code() > 3 {
- return false
- } else {
- return true
- }
-}
-
-func (self *TestProtocol) Name() string {
- return "a"
-}
-
-func Packet(offset MsgCode, code MsgCode, params ...interface{}) []byte {
- msg, _ := NewMsg(code, params...)
- encoded := msg.Encode(offset)
- packet := []byte{34, 64, 8, 145}
- packet = append(packet, ethutil.NumberToBytes(uint32(len(encoded)), 32)...)
- return append(packet, encoded...)
-}
-
-func TestRead(t *testing.T) {
- handlers := make(Handlers)
- testProtocol := &TestProtocol{Msgs: []*Msg{}}
- handlers["a"] = func(p *Peer) Protocol { return testProtocol }
- net, _, mess := setupMessenger(handlers)
- mess.AddProtocols([]string{"a"})
- defer mess.Stop()
- wait := 1 * time.Millisecond
- packet := Packet(16, 1, uint32(1), "000")
- go net.In(0, packet)
- time.Sleep(wait)
- if len(testProtocol.Msgs) != 1 {
- t.Errorf("msg not relayed to correct protocol")
- } else {
- if testProtocol.Msgs[0].Code() != 1 {
- t.Errorf("incorrect msg code relayed to protocol")
- }
- }
-}
-
-func TestWrite(t *testing.T) {
- handlers := make(Handlers)
- testProtocol := &TestProtocol{Msgs: []*Msg{}}
- handlers["a"] = func(p *Peer) Protocol { return testProtocol }
- net, _, mess := setupMessenger(handlers)
- mess.AddProtocols([]string{"a"})
- defer mess.Stop()
- wait := 1 * time.Millisecond
- msg, _ := NewMsg(3, uint32(1), "000")
- err := mess.Write("b", msg)
- if err == nil {
- t.Errorf("expect error for unknown protocol")
- }
- err = mess.Write("a", msg)
- if err != nil {
- t.Errorf("expect no error for known protocol: %v", err)
- } else {
- time.Sleep(wait)
- if len(net.Out) != 1 {
- t.Errorf("msg not written")
- } else {
- out := net.Out[0]
- packet := Packet(16, 3, uint32(1), "000")
- if bytes.Compare(out, packet) != 0 {
- t.Errorf("incorrect packet %v", out)
- }
- }
- }
-}
-
-func TestPulse(t *testing.T) {
- net, _, mess := setupMessenger(make(Handlers))
- defer mess.Stop()
- ping := false
- timeout := false
- pingTimeout := 10 * time.Millisecond
- gracePeriod := 200 * time.Millisecond
- go mess.PingPong(pingTimeout, gracePeriod, func() { ping = true }, func() { timeout = true })
- net.In(0, Packet(0, 1))
- if ping {
- t.Errorf("ping sent too early")
- }
- time.Sleep(pingTimeout + 100*time.Millisecond)
- if !ping {
- t.Errorf("no ping sent after timeout")
- }
- if timeout {
- t.Errorf("timeout too early")
- }
- ping = false
- net.In(0, Packet(0, 1))
- time.Sleep(pingTimeout + 100*time.Millisecond)
- if !ping {
- t.Errorf("no ping sent after timeout")
- }
- if timeout {
- t.Errorf("timeout too early")
- }
- ping = false
- time.Sleep(gracePeriod)
- if ping {
- t.Errorf("ping called twice")
- }
- if !timeout {
- t.Errorf("no timeout after grace period")
- }
-}
diff --git a/p2p/natpmp.go b/p2p/natpmp.go
index ff966d070..6714678c4 100644
--- a/p2p/natpmp.go
+++ b/p2p/natpmp.go
@@ -3,6 +3,7 @@ package p2p
import (
"fmt"
"net"
+ "time"
natpmp "github.com/jackpal/go-nat-pmp"
)
@@ -13,38 +14,37 @@ import (
// + Register for changes to the external address.
// + Re-register port mapping when router reboots.
// + A mechanism for keeping a port mapping registered.
+// + Discover gateway address automatically.
type natPMPClient struct {
client *natpmp.Client
}
-func NewNatPMP(gateway net.IP) (nat NAT) {
+// PMP returns a NAT traverser that uses NAT-PMP. The provided gateway
+// address should be the IP of your router.
+func PMP(gateway net.IP) (nat NAT) {
return &natPMPClient{natpmp.NewClient(gateway)}
}
-func (n *natPMPClient) GetExternalAddress() (addr net.IP, err error) {
- response, err := n.client.GetExternalAddress()
- if err != nil {
- return
- }
- ip := response.ExternalIPAddress
- addr = net.IPv4(ip[0], ip[1], ip[2], ip[3])
- return
+func (*natPMPClient) String() string {
+ return "NAT-PMP"
}
-func (n *natPMPClient) AddPortMapping(protocol string, externalPort, internalPort int,
- description string, timeout int) (mappedExternalPort int, err error) {
- if timeout <= 0 {
- err = fmt.Errorf("timeout must not be <= 0")
- return
+func (n *natPMPClient) GetExternalAddress() (net.IP, error) {
+ response, err := n.client.GetExternalAddress()
+ if err != nil {
+ return nil, err
+ }
+ return response.ExternalIPAddress[:], nil
+}
+
+func (n *natPMPClient) AddPortMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error {
+ if lifetime <= 0 {
+ return fmt.Errorf("lifetime must not be <= 0")
}
// Note order of port arguments is switched between our AddPortMapping and the client's AddPortMapping.
- response, err := n.client.AddPortMapping(protocol, internalPort, externalPort, timeout)
- if err != nil {
- return
- }
- mappedExternalPort = int(response.MappedExternalPort)
- return
+ _, err := n.client.AddPortMapping(protocol, intport, extport, int(lifetime/time.Second))
+ return err
}
func (n *natPMPClient) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
diff --git a/p2p/natupnp.go b/p2p/natupnp.go
index fa9798d4d..2e0d8ce8d 100644
--- a/p2p/natupnp.go
+++ b/p2p/natupnp.go
@@ -7,6 +7,7 @@ import (
"bytes"
"encoding/xml"
"errors"
+ "fmt"
"net"
"net/http"
"os"
@@ -15,28 +16,46 @@ import (
"time"
)
+const (
+ upnpDiscoverAttempts = 3
+ upnpDiscoverTimeout = 5 * time.Second
+)
+
+// UPNP returns a NAT port mapper that uses UPnP. It will attempt to
+// discover the address of your router using UDP broadcasts.
+func UPNP() NAT {
+ return &upnpNAT{}
+}
+
type upnpNAT struct {
serviceURL string
ourIP string
}
-func upnpDiscover(attempts int) (nat NAT, err error) {
+func (n *upnpNAT) String() string {
+ return "UPNP"
+}
+
+func (n *upnpNAT) discover() error {
+ if n.serviceURL != "" {
+ // already discovered
+ return nil
+ }
+
ssdp, err := net.ResolveUDPAddr("udp4", "239.255.255.250:1900")
if err != nil {
- return
+ return err
}
+ // TODO: try on all network interfaces simultaneously.
+ // Broadcasting on 0.0.0.0 could select a random interface
+ // to send on (platform specific).
conn, err := net.ListenPacket("udp4", ":0")
if err != nil {
- return
- }
- socket := conn.(*net.UDPConn)
- defer socket.Close()
-
- err = socket.SetDeadline(time.Now().Add(10 * time.Second))
- if err != nil {
- return
+ return err
}
+ defer conn.Close()
+ conn.SetDeadline(time.Now().Add(10 * time.Second))
st := "ST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\n"
buf := bytes.NewBufferString(
"M-SEARCH * HTTP/1.1\r\n" +
@@ -46,19 +65,16 @@ func upnpDiscover(attempts int) (nat NAT, err error) {
"MX: 2\r\n\r\n")
message := buf.Bytes()
answerBytes := make([]byte, 1024)
- for i := 0; i < attempts; i++ {
- _, err = socket.WriteToUDP(message, ssdp)
+ for i := 0; i < upnpDiscoverAttempts; i++ {
+ _, err = conn.WriteTo(message, ssdp)
if err != nil {
- return
+ return err
}
- var n int
- n, _, err = socket.ReadFromUDP(answerBytes)
+ nn, _, err := conn.ReadFrom(answerBytes)
if err != nil {
continue
- // socket.Close()
- // return
}
- answer := string(answerBytes[0:n])
+ answer := string(answerBytes[0:nn])
if strings.Index(answer, "\r\n"+st) < 0 {
continue
}
@@ -79,17 +95,81 @@ func upnpDiscover(attempts int) (nat NAT, err error) {
var serviceURL string
serviceURL, err = getServiceURL(locURL)
if err != nil {
- return
+ return err
}
var ourIP string
ourIP, err = getOurIP()
if err != nil {
- return
+ return err
}
- nat = &upnpNAT{serviceURL: serviceURL, ourIP: ourIP}
+ n.serviceURL = serviceURL
+ n.ourIP = ourIP
+ return nil
+ }
+ return errors.New("UPnP port discovery failed.")
+}
+
+func (n *upnpNAT) GetExternalAddress() (addr net.IP, err error) {
+ if err := n.discover(); err != nil {
+ return nil, err
+ }
+ info, err := n.getStatusInfo()
+ return net.ParseIP(info.externalIpAddress), err
+}
+
+func (n *upnpNAT) AddPortMapping(protocol string, extport, intport int, description string, lifetime time.Duration) error {
+ if err := n.discover(); err != nil {
+ return err
+ }
+
+ // A single concatenation would break ARM compilation.
+ message := "<u:AddPortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
+ "<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(extport)
+ message += "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>"
+ message += "<NewInternalPort>" + strconv.Itoa(extport) + "</NewInternalPort>" +
+ "<NewInternalClient>" + n.ourIP + "</NewInternalClient>" +
+ "<NewEnabled>1</NewEnabled><NewPortMappingDescription>"
+ message += description +
+ "</NewPortMappingDescription><NewLeaseDuration>" + fmt.Sprint(lifetime/time.Second) +
+ "</NewLeaseDuration></u:AddPortMapping>"
+
+ // TODO: check response to see if the port was forwarded
+ _, err := soapRequest(n.serviceURL, "AddPortMapping", message)
+ return err
+}
+
+func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort int) error {
+ if err := n.discover(); err != nil {
+ return err
+ }
+
+ message := "<u:DeletePortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
+ "<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort) +
+ "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>" +
+ "</u:DeletePortMapping>"
+
+ // TODO: check response to see if the port was deleted
+ _, err := soapRequest(n.serviceURL, "DeletePortMapping", message)
+ return err
+}
+
+type statusInfo struct {
+ externalIpAddress string
+}
+
+func (n *upnpNAT) getStatusInfo() (info statusInfo, err error) {
+ message := "<u:GetStatusInfo xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
+ "</u:GetStatusInfo>"
+
+ var response *http.Response
+ response, err = soapRequest(n.serviceURL, "GetStatusInfo", message)
+ if err != nil {
return
}
- err = errors.New("UPnP port discovery failed.")
+
+ // TODO: Write a soap reply parser. It has to eat the Body and envelope tags...
+
+ response.Body.Close()
return
}
@@ -259,77 +339,3 @@ func soapRequest(url, function, message string) (r *http.Response, err error) {
}
return
}
-
-type statusInfo struct {
- externalIpAddress string
-}
-
-func (n *upnpNAT) getStatusInfo() (info statusInfo, err error) {
-
- message := "<u:GetStatusInfo xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
- "</u:GetStatusInfo>"
-
- var response *http.Response
- response, err = soapRequest(n.serviceURL, "GetStatusInfo", message)
- if err != nil {
- return
- }
-
- // TODO: Write a soap reply parser. It has to eat the Body and envelope tags...
-
- response.Body.Close()
- return
-}
-
-func (n *upnpNAT) GetExternalAddress() (addr net.IP, err error) {
- info, err := n.getStatusInfo()
- if err != nil {
- return
- }
- addr = net.ParseIP(info.externalIpAddress)
- return
-}
-
-func (n *upnpNAT) AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error) {
- // A single concatenation would break ARM compilation.
- message := "<u:AddPortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
- "<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort)
- message += "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>"
- message += "<NewInternalPort>" + strconv.Itoa(internalPort) + "</NewInternalPort>" +
- "<NewInternalClient>" + n.ourIP + "</NewInternalClient>" +
- "<NewEnabled>1</NewEnabled><NewPortMappingDescription>"
- message += description +
- "</NewPortMappingDescription><NewLeaseDuration>" + strconv.Itoa(timeout) +
- "</NewLeaseDuration></u:AddPortMapping>"
-
- var response *http.Response
- response, err = soapRequest(n.serviceURL, "AddPortMapping", message)
- if err != nil {
- return
- }
-
- // TODO: check response to see if the port was forwarded
- // log.Println(message, response)
- mappedExternalPort = externalPort
- _ = response
- return
-}
-
-func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
-
- message := "<u:DeletePortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
- "<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort) +
- "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>" +
- "</u:DeletePortMapping>"
-
- var response *http.Response
- response, err = soapRequest(n.serviceURL, "DeletePortMapping", message)
- if err != nil {
- return
- }
-
- // TODO: check response to see if the port was deleted
- // log.Println(message, response)
- _ = response
- return
-}
diff --git a/p2p/network.go b/p2p/network.go
deleted file mode 100644
index 820cef1a9..000000000
--- a/p2p/network.go
+++ /dev/null
@@ -1,196 +0,0 @@
-package p2p
-
-import (
- "fmt"
- "math/rand"
- "net"
- "strconv"
- "time"
-)
-
-const (
- DialerTimeout = 180 //seconds
- KeepAlivePeriod = 60 //minutes
- portMappingUpdateInterval = 900 // seconds = 15 mins
- upnpDiscoverAttempts = 3
-)
-
-// Dialer is not an interface in net, so we define one
-// *net.Dialer conforms to this
-type Dialer interface {
- Dial(network, address string) (net.Conn, error)
-}
-
-type Network interface {
- Start() error
- Listener(net.Addr) (net.Listener, error)
- Dialer(net.Addr) (Dialer, error)
- NewAddr(string, int) (addr net.Addr, err error)
- ParseAddr(string) (addr net.Addr, err error)
-}
-
-type NAT interface {
- GetExternalAddress() (addr net.IP, err error)
- AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
- DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
-}
-
-type TCPNetwork struct {
- nat NAT
- natType NATType
- quit chan chan bool
- ports chan string
-}
-
-type NATType int
-
-const (
- NONE = iota
- UPNP
- PMP
-)
-
-const (
- portMappingTimeout = 1200 // 20 mins
-)
-
-func NewTCPNetwork(natType NATType) (net *TCPNetwork) {
- return &TCPNetwork{
- natType: natType,
- ports: make(chan string),
- }
-}
-
-func (self *TCPNetwork) Dialer(addr net.Addr) (Dialer, error) {
- return &net.Dialer{
- Timeout: DialerTimeout * time.Second,
- // KeepAlive: KeepAlivePeriod * time.Minute,
- LocalAddr: addr,
- }, nil
-}
-
-func (self *TCPNetwork) Listener(addr net.Addr) (net.Listener, error) {
- if self.natType == UPNP {
- _, port, _ := net.SplitHostPort(addr.String())
- if self.quit == nil {
- self.quit = make(chan chan bool)
- go self.updatePortMappings()
- }
- self.ports <- port
- }
- return net.Listen(addr.Network(), addr.String())
-}
-
-func (self *TCPNetwork) Start() (err error) {
- switch self.natType {
- case NONE:
- case UPNP:
- nat, uerr := upnpDiscover(upnpDiscoverAttempts)
- if uerr != nil {
- err = fmt.Errorf("UPNP failed: ", uerr)
- } else {
- self.nat = nat
- }
- case PMP:
- err = fmt.Errorf("PMP not implemented")
- default:
- err = fmt.Errorf("Invalid NAT type: %v", self.natType)
- }
- return
-}
-
-func (self *TCPNetwork) Stop() {
- q := make(chan bool)
- self.quit <- q
- <-q
-}
-
-func (self *TCPNetwork) addPortMapping(lport int) (err error) {
- _, err = self.nat.AddPortMapping("TCP", lport, lport, "p2p listen port", portMappingTimeout)
- if err != nil {
- logger.Errorf("unable to add port mapping on %v: %v", lport, err)
- } else {
- logger.Debugf("succesfully added port mapping on %v", lport)
- }
- return
-}
-
-func (self *TCPNetwork) updatePortMappings() {
- timer := time.NewTimer(portMappingUpdateInterval * time.Second)
- lports := []int{}
-out:
- for {
- select {
- case port := <-self.ports:
- int64lport, _ := strconv.ParseInt(port, 10, 16)
- lport := int(int64lport)
- if err := self.addPortMapping(lport); err != nil {
- lports = append(lports, lport)
- }
- case <-timer.C:
- for lport := range lports {
- if err := self.addPortMapping(lport); err != nil {
- }
- }
- case errc := <-self.quit:
- errc <- true
- break out
- }
- }
-
- timer.Stop()
- for lport := range lports {
- if err := self.nat.DeletePortMapping("TCP", lport, lport); err != nil {
- logger.Debugf("unable to remove port mapping on %v: %v", lport, err)
- } else {
- logger.Debugf("succesfully removed port mapping on %v", lport)
- }
- }
-}
-
-func (self *TCPNetwork) NewAddr(host string, port int) (net.Addr, error) {
- ip, err := self.lookupIP(host)
- if err == nil {
- return &net.TCPAddr{
- IP: ip,
- Port: port,
- }, nil
- }
- return nil, err
-}
-
-func (self *TCPNetwork) ParseAddr(address string) (net.Addr, error) {
- host, port, err := net.SplitHostPort(address)
- if err == nil {
- iport, _ := strconv.Atoi(port)
- addr, e := self.NewAddr(host, iport)
- return addr, e
- }
- return nil, err
-}
-
-func (*TCPNetwork) lookupIP(host string) (ip net.IP, err error) {
- if ip = net.ParseIP(host); ip != nil {
- return
- }
-
- var ips []net.IP
- ips, err = net.LookupIP(host)
- if err != nil {
- logger.Warnln(err)
- return
- }
- if len(ips) == 0 {
- err = fmt.Errorf("No IP addresses available for %v", host)
- logger.Warnln(err)
- return
- }
- if len(ips) > 1 {
- // Pick a random IP address, simulating round-robin DNS.
- rand.Seed(time.Now().UTC().UnixNano())
- ip = ips[rand.Intn(len(ips))]
- } else {
- ip = ips[0]
- }
- return
-}
diff --git a/p2p/peer.go b/p2p/peer.go
index f4b68a007..893ba86d7 100644
--- a/p2p/peer.go
+++ b/p2p/peer.go
@@ -1,83 +1,455 @@
package p2p
import (
+ "bufio"
+ "bytes"
"fmt"
+ "io"
+ "io/ioutil"
"net"
- "strconv"
+ "sort"
+ "sync"
+ "time"
+
+ "github.com/ethereum/go-ethereum/event"
+ "github.com/ethereum/go-ethereum/logger"
)
-type Peer struct {
- // quit chan chan bool
- Inbound bool // inbound (via listener) or outbound (via dialout)
- Address net.Addr
- Host []byte
- Port uint16
- Pubkey []byte
- Id string
- Caps []string
- peerErrorChan chan *PeerError
- messenger *Messenger
- peerErrorHandler *PeerErrorHandler
- server *Server
+// peerAddr is the structure of a peer list element.
+// It is also a valid net.Addr.
+type peerAddr struct {
+ IP net.IP
+ Port uint64
+ Pubkey []byte // optional
}
-func (self *Peer) Messenger() *Messenger {
- return self.messenger
-}
-
-func (self *Peer) PeerErrorChan() chan *PeerError {
- return self.peerErrorChan
-}
-
-func (self *Peer) Server() *Server {
- return self.server
-}
-
-func NewPeer(conn net.Conn, address net.Addr, inbound bool, server *Server) *Peer {
- peerErrorChan := NewPeerErrorChannel()
- host, port, _ := net.SplitHostPort(address.String())
- intport, _ := strconv.Atoi(port)
- peer := &Peer{
- Inbound: inbound,
- Address: address,
- Port: uint16(intport),
- Host: net.ParseIP(host),
- peerErrorChan: peerErrorChan,
- server: server,
+func newPeerAddr(addr net.Addr, pubkey []byte) *peerAddr {
+ n := addr.Network()
+ if n != "tcp" && n != "tcp4" && n != "tcp6" {
+ // for testing with non-TCP
+ return &peerAddr{net.ParseIP("127.0.0.1"), 30303, pubkey}
}
- connection := NewConnection(conn, peerErrorChan)
- peer.messenger = NewMessenger(peer, connection, peerErrorChan, server.Handlers())
- peer.peerErrorHandler = NewPeerErrorHandler(address, server.PeerDisconnect(), peerErrorChan, server.Blacklist())
+ ta := addr.(*net.TCPAddr)
+ return &peerAddr{ta.IP, uint64(ta.Port), pubkey}
+}
+
+func (d peerAddr) Network() string {
+ if d.IP.To4() != nil {
+ return "tcp4"
+ } else {
+ return "tcp6"
+ }
+}
+
+func (d peerAddr) String() string {
+ return fmt.Sprintf("%v:%d", d.IP, d.Port)
+}
+
+func (d peerAddr) RlpData() interface{} {
+ return []interface{}{d.IP, d.Port, d.Pubkey}
+}
+
+// Peer represents a remote peer.
+type Peer struct {
+ // Peers have all the log methods.
+ // Use them to display messages related to the peer.
+ *logger.Logger
+
+ infolock sync.Mutex
+ identity ClientIdentity
+ caps []Cap
+ listenAddr *peerAddr // what remote peer is listening on
+ dialAddr *peerAddr // non-nil if dialing
+
+ // The mutex protects the connection
+ // so only one protocol can write at a time.
+ writeMu sync.Mutex
+ conn net.Conn
+ bufconn *bufio.ReadWriter
+
+ // These fields maintain the running protocols.
+ protocols []Protocol
+ runBaseProtocol bool // for testing
+
+ runlock sync.RWMutex // protects running
+ running map[string]*proto
+
+ protoWG sync.WaitGroup
+ protoErr chan error
+ closed chan struct{}
+ disc chan DiscReason
+
+ activity event.TypeMux // for activity events
+
+ slot int // index into Server peer list
+
+ // These fields are kept so base protocol can access them.
+ // TODO: this should be one or more interfaces
+ ourID ClientIdentity // client id of the Server
+ ourListenAddr *peerAddr // listen addr of Server, nil if not listening
+ newPeerAddr chan<- *peerAddr // tell server about received peers
+ otherPeers func() []*Peer // should return the list of all peers
+ pubkeyHook func(*peerAddr) error // called at end of handshake to validate pubkey
+}
+
+// NewPeer returns a peer for testing purposes.
+func NewPeer(id ClientIdentity, caps []Cap) *Peer {
+ conn, _ := net.Pipe()
+ peer := newPeer(conn, nil, nil)
+ peer.setHandshakeInfo(id, nil, caps)
+ close(peer.closed)
return peer
}
-func (self *Peer) String() string {
- var kind string
- if self.Inbound {
- kind = "inbound"
- } else {
+func newServerPeer(server *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
+ p := newPeer(conn, server.Protocols, dialAddr)
+ p.ourID = server.Identity
+ p.newPeerAddr = server.peerConnect
+ p.otherPeers = server.Peers
+ p.pubkeyHook = server.verifyPeer
+ p.runBaseProtocol = true
+
+ // laddr can be updated concurrently by NAT traversal.
+ // newServerPeer must be called with the server lock held.
+ if server.laddr != nil {
+ p.ourListenAddr = newPeerAddr(server.laddr, server.Identity.Pubkey())
+ }
+ return p
+}
+
+func newPeer(conn net.Conn, protocols []Protocol, dialAddr *peerAddr) *Peer {
+ p := &Peer{
+ Logger: logger.NewLogger("P2P " + conn.RemoteAddr().String()),
+ conn: conn,
+ dialAddr: dialAddr,
+ bufconn: bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn)),
+ protocols: protocols,
+ running: make(map[string]*proto),
+ disc: make(chan DiscReason),
+ protoErr: make(chan error),
+ closed: make(chan struct{}),
+ }
+ return p
+}
+
+// Identity returns the client identity of the remote peer. The
+// identity can be nil if the peer has not yet completed the
+// handshake.
+func (p *Peer) Identity() ClientIdentity {
+ p.infolock.Lock()
+ defer p.infolock.Unlock()
+ return p.identity
+}
+
+// Caps returns the capabilities (supported subprotocols) of the remote peer.
+func (p *Peer) Caps() []Cap {
+ p.infolock.Lock()
+ defer p.infolock.Unlock()
+ return p.caps
+}
+
+func (p *Peer) setHandshakeInfo(id ClientIdentity, laddr *peerAddr, caps []Cap) {
+ p.infolock.Lock()
+ p.identity = id
+ p.listenAddr = laddr
+ p.caps = caps
+ p.infolock.Unlock()
+}
+
+// RemoteAddr returns the remote address of the network connection.
+func (p *Peer) RemoteAddr() net.Addr {
+ return p.conn.RemoteAddr()
+}
+
+// LocalAddr returns the local address of the network connection.
+func (p *Peer) LocalAddr() net.Addr {
+ return p.conn.LocalAddr()
+}
+
+// Disconnect terminates the peer connection with the given reason.
+// It returns immediately and does not wait until the connection is closed.
+func (p *Peer) Disconnect(reason DiscReason) {
+ select {
+ case p.disc <- reason:
+ case <-p.closed:
+ }
+}
+
+// String implements fmt.Stringer.
+func (p *Peer) String() string {
+ kind := "inbound"
+ p.infolock.Lock()
+ if p.dialAddr != nil {
kind = "outbound"
}
- return fmt.Sprintf("%v:%v (%s) v%v %v", self.Host, self.Port, kind, self.Id, self.Caps)
+ p.infolock.Unlock()
+ return fmt.Sprintf("Peer(%p %v %s)", p, p.conn.RemoteAddr(), kind)
}
-func (self *Peer) Write(protocol string, msg *Msg) error {
- return self.messenger.Write(protocol, msg)
+const (
+ // maximum amount of time allowed for reading a message
+ msgReadTimeout = 5 * time.Second
+ // maximum amount of time allowed for writing a message
+ msgWriteTimeout = 5 * time.Second
+ // messages smaller than this many bytes will be read at
+ // once before passing them to a protocol.
+ wholePayloadSize = 64 * 1024
+)
+
+var (
+ inactivityTimeout = 2 * time.Second
+ disconnectGracePeriod = 2 * time.Second
+)
+
+func (p *Peer) loop() (reason DiscReason, err error) {
+ defer p.activity.Stop()
+ defer p.closeProtocols()
+ defer close(p.closed)
+ defer p.conn.Close()
+
+ // read loop
+ readMsg := make(chan Msg)
+ readErr := make(chan error)
+ readNext := make(chan bool, 1)
+ protoDone := make(chan struct{}, 1)
+ go p.readLoop(readMsg, readErr, readNext)
+ readNext <- true
+
+ if p.runBaseProtocol {
+ p.startBaseProtocol()
+ }
+
+loop:
+ for {
+ select {
+ case msg := <-readMsg:
+ // a new message has arrived.
+ var wait bool
+ if wait, err = p.dispatch(msg, protoDone); err != nil {
+ p.Errorf("msg dispatch error: %v\n", err)
+ reason = discReasonForError(err)
+ break loop
+ }
+ if !wait {
+ // Msg has already been read completely, continue with next message.
+ readNext <- true
+ }
+ p.activity.Post(time.Now())
+ case <-protoDone:
+ // protocol has consumed the message payload,
+ // we can continue reading from the socket.
+ readNext <- true
+
+ case err := <-readErr:
+ // read failed. there is no need to run the
+ // polite disconnect sequence because the connection
+ // is probably dead anyway.
+ // TODO: handle write errors as well
+ return DiscNetworkError, err
+ case err = <-p.protoErr:
+ reason = discReasonForError(err)
+ break loop
+ case reason = <-p.disc:
+ break loop
+ }
+ }
+
+ // wait for read loop to return.
+ close(readNext)
+ <-readErr
+ // tell the remote end to disconnect
+ done := make(chan struct{})
+ go func() {
+ p.conn.SetDeadline(time.Now().Add(disconnectGracePeriod))
+ p.writeMsg(NewMsg(discMsg, reason), disconnectGracePeriod)
+ io.Copy(ioutil.Discard, p.conn)
+ close(done)
+ }()
+ select {
+ case <-done:
+ case <-time.After(disconnectGracePeriod):
+ }
+ return reason, err
}
-func (self *Peer) Start() {
- self.peerErrorHandler.Start()
- self.messenger.Start()
+func (p *Peer) readLoop(msgc chan<- Msg, errc chan<- error, unblock <-chan bool) {
+ for _ = range unblock {
+ p.conn.SetReadDeadline(time.Now().Add(msgReadTimeout))
+ if msg, err := readMsg(p.bufconn); err != nil {
+ errc <- err
+ } else {
+ msgc <- msg
+ }
+ }
+ close(errc)
}
-func (self *Peer) Stop() {
- self.peerErrorHandler.Stop()
- self.messenger.Stop()
- // q := make(chan bool)
- // self.quit <- q
- // <-q
+func (p *Peer) dispatch(msg Msg, protoDone chan struct{}) (wait bool, err error) {
+ proto, err := p.getProto(msg.Code)
+ if err != nil {
+ return false, err
+ }
+ if msg.Size <= wholePayloadSize {
+ // optimization: msg is small enough, read all
+ // of it and move on to the next message
+ buf, err := ioutil.ReadAll(msg.Payload)
+ if err != nil {
+ return false, err
+ }
+ msg.Payload = bytes.NewReader(buf)
+ proto.in <- msg
+ } else {
+ wait = true
+ pr := &eofSignal{msg.Payload, protoDone}
+ msg.Payload = pr
+ proto.in <- msg
+ }
+ return wait, nil
}
-func (p *Peer) Encode() []interface{} {
- return []interface{}{p.Host, p.Port, p.Pubkey}
+func (p *Peer) startBaseProtocol() {
+ p.runlock.Lock()
+ defer p.runlock.Unlock()
+ p.running[""] = p.startProto(0, Protocol{
+ Length: baseProtocolLength,
+ Run: runBaseProtocol,
+ })
+}
+
+// startProtocols starts matching named subprotocols.
+func (p *Peer) startSubprotocols(caps []Cap) {
+ sort.Sort(capsByName(caps))
+
+ p.runlock.Lock()
+ defer p.runlock.Unlock()
+ offset := baseProtocolLength
+outer:
+ for _, cap := range caps {
+ for _, proto := range p.protocols {
+ if proto.Name == cap.Name &&
+ proto.Version == cap.Version &&
+ p.running[cap.Name] == nil {
+ p.running[cap.Name] = p.startProto(offset, proto)
+ offset += proto.Length
+ continue outer
+ }
+ }
+ }
+}
+
+func (p *Peer) startProto(offset uint64, impl Protocol) *proto {
+ rw := &proto{
+ in: make(chan Msg),
+ offset: offset,
+ maxcode: impl.Length,
+ peer: p,
+ }
+ p.protoWG.Add(1)
+ go func() {
+ err := impl.Run(p, rw)
+ if err == nil {
+ p.Infof("protocol %q returned", impl.Name)
+ err = newPeerError(errMisc, "protocol returned")
+ } else {
+ p.Errorf("protocol %q error: %v\n", impl.Name, err)
+ }
+ select {
+ case p.protoErr <- err:
+ case <-p.closed:
+ }
+ p.protoWG.Done()
+ }()
+ return rw
+}
+
+// getProto finds the protocol responsible for handling
+// the given message code.
+func (p *Peer) getProto(code uint64) (*proto, error) {
+ p.runlock.RLock()
+ defer p.runlock.RUnlock()
+ for _, proto := range p.running {
+ if code >= proto.offset && code < proto.offset+proto.maxcode {
+ return proto, nil
+ }
+ }
+ return nil, newPeerError(errInvalidMsgCode, "%d", code)
+}
+
+func (p *Peer) closeProtocols() {
+ p.runlock.RLock()
+ for _, p := range p.running {
+ close(p.in)
+ }
+ p.runlock.RUnlock()
+ p.protoWG.Wait()
+}
+
+// writeProtoMsg sends the given message on behalf of the given named protocol.
+func (p *Peer) writeProtoMsg(protoName string, msg Msg) error {
+ p.runlock.RLock()
+ proto, ok := p.running[protoName]
+ p.runlock.RUnlock()
+ if !ok {
+ return fmt.Errorf("protocol %s not handled by peer", protoName)
+ }
+ if msg.Code >= proto.maxcode {
+ return newPeerError(errInvalidMsgCode, "code %x is out of range for protocol %q", msg.Code, protoName)
+ }
+ msg.Code += proto.offset
+ return p.writeMsg(msg, msgWriteTimeout)
+}
+
+// writeMsg writes a message to the connection.
+func (p *Peer) writeMsg(msg Msg, timeout time.Duration) error {
+ p.writeMu.Lock()
+ defer p.writeMu.Unlock()
+ p.conn.SetWriteDeadline(time.Now().Add(timeout))
+ if err := writeMsg(p.bufconn, msg); err != nil {
+ return newPeerError(errWrite, "%v", err)
+ }
+ return p.bufconn.Flush()
+}
+
+type proto struct {
+ name string
+ in chan Msg
+ maxcode, offset uint64
+ peer *Peer
+}
+
+func (rw *proto) WriteMsg(msg Msg) error {
+ if msg.Code >= rw.maxcode {
+ return newPeerError(errInvalidMsgCode, "not handled")
+ }
+ msg.Code += rw.offset
+ return rw.peer.writeMsg(msg, msgWriteTimeout)
+}
+
+func (rw *proto) EncodeMsg(code uint64, data ...interface{}) error {
+ return rw.WriteMsg(NewMsg(code, data))
+}
+
+func (rw *proto) ReadMsg() (Msg, error) {
+ msg, ok := <-rw.in
+ if !ok {
+ return msg, io.EOF
+ }
+ msg.Code -= rw.offset
+ return msg, nil
+}
+
+// eofSignal wraps a reader with eof signaling.
+// the eof channel is closed when the wrapped reader
+// reaches EOF.
+type eofSignal struct {
+ wrapped io.Reader
+ eof chan<- struct{}
+}
+
+func (r *eofSignal) Read(buf []byte) (int, error) {
+ n, err := r.wrapped.Read(buf)
+ if err != nil {
+ r.eof <- struct{}{} // tell Peer that msg has been consumed
+ }
+ return n, err
}
diff --git a/p2p/peer_error.go b/p2p/peer_error.go
index de921878a..88b870fbd 100644
--- a/p2p/peer_error.go
+++ b/p2p/peer_error.go
@@ -4,73 +4,121 @@ import (
"fmt"
)
-type ErrorCode int
-
-const errorChanCapacity = 10
-
const (
- PacketTooShort = iota
- PayloadTooShort
- MagicTokenMismatch
- EmptyPayload
- ReadError
- WriteError
- MiscError
- InvalidMsgCode
- InvalidMsg
- P2PVersionMismatch
- PubkeyMissing
- PubkeyInvalid
- PubkeyForbidden
- ProtocolBreach
- PortMismatch
- PingTimeout
- InvalidGenesis
- InvalidNetworkId
- InvalidProtocolVersion
+ errMagicTokenMismatch = iota
+ errRead
+ errWrite
+ errMisc
+ errInvalidMsgCode
+ errInvalidMsg
+ errP2PVersionMismatch
+ errPubkeyMissing
+ errPubkeyInvalid
+ errPubkeyForbidden
+ errProtocolBreach
+ errPingTimeout
+ errInvalidNetworkId
+ errInvalidProtocolVersion
)
-var errorToString = map[ErrorCode]string{
- PacketTooShort: "Packet too short",
- PayloadTooShort: "Payload too short",
- MagicTokenMismatch: "Magic token mismatch",
- EmptyPayload: "Empty payload",
- ReadError: "Read error",
- WriteError: "Write error",
- MiscError: "Misc error",
- InvalidMsgCode: "Invalid message code",
- InvalidMsg: "Invalid message",
- P2PVersionMismatch: "P2P Version Mismatch",
- PubkeyMissing: "Public key missing",
- PubkeyInvalid: "Public key invalid",
- PubkeyForbidden: "Public key forbidden",
- ProtocolBreach: "Protocol Breach",
- PortMismatch: "Port mismatch",
- PingTimeout: "Ping timeout",
- InvalidGenesis: "Invalid genesis block",
- InvalidNetworkId: "Invalid network id",
- InvalidProtocolVersion: "Invalid protocol version",
+var errorToString = map[int]string{
+ errMagicTokenMismatch: "Magic token mismatch",
+ errRead: "Read error",
+ errWrite: "Write error",
+ errMisc: "Misc error",
+ errInvalidMsgCode: "Invalid message code",
+ errInvalidMsg: "Invalid message",
+ errP2PVersionMismatch: "P2P Version Mismatch",
+ errPubkeyMissing: "Public key missing",
+ errPubkeyInvalid: "Public key invalid",
+ errPubkeyForbidden: "Public key forbidden",
+ errProtocolBreach: "Protocol Breach",
+ errPingTimeout: "Ping timeout",
+ errInvalidNetworkId: "Invalid network id",
+ errInvalidProtocolVersion: "Invalid protocol version",
}
-type PeerError struct {
- Code ErrorCode
+type peerError struct {
+ Code int
message string
}
-func NewPeerError(code ErrorCode, format string, v ...interface{}) *PeerError {
+func newPeerError(code int, format string, v ...interface{}) *peerError {
desc, ok := errorToString[code]
if !ok {
panic("invalid error code")
}
- format = desc + ": " + format
- message := fmt.Sprintf(format, v...)
- return &PeerError{code, message}
+ err := &peerError{code, desc}
+ if format != "" {
+ err.message += ": " + fmt.Sprintf(format, v...)
+ }
+ return err
}
-func (self *PeerError) Error() string {
+func (self *peerError) Error() string {
return self.message
}
-func NewPeerErrorChannel() chan *PeerError {
- return make(chan *PeerError, errorChanCapacity)
+type DiscReason byte
+
+const (
+ DiscRequested DiscReason = 0x00
+ DiscNetworkError = 0x01
+ DiscProtocolError = 0x02
+ DiscUselessPeer = 0x03
+ DiscTooManyPeers = 0x04
+ DiscAlreadyConnected = 0x05
+ DiscIncompatibleVersion = 0x06
+ DiscInvalidIdentity = 0x07
+ DiscQuitting = 0x08
+ DiscUnexpectedIdentity = 0x09
+ DiscSelf = 0x0a
+ DiscReadTimeout = 0x0b
+ DiscSubprotocolError = 0x10
+)
+
+var discReasonToString = [DiscSubprotocolError + 1]string{
+ DiscRequested: "Disconnect requested",
+ DiscNetworkError: "Network error",
+ DiscProtocolError: "Breach of protocol",
+ DiscUselessPeer: "Useless peer",
+ DiscTooManyPeers: "Too many peers",
+ DiscAlreadyConnected: "Already connected",
+ DiscIncompatibleVersion: "Incompatible P2P protocol version",
+ DiscInvalidIdentity: "Invalid node identity",
+ DiscQuitting: "Client quitting",
+ DiscUnexpectedIdentity: "Unexpected identity",
+ DiscSelf: "Connected to self",
+ DiscReadTimeout: "Read timeout",
+ DiscSubprotocolError: "Subprotocol error",
+}
+
+func (d DiscReason) String() string {
+ if len(discReasonToString) < int(d) {
+ return fmt.Sprintf("Unknown Reason(%d)", d)
+ }
+ return discReasonToString[d]
+}
+
+func discReasonForError(err error) DiscReason {
+ peerError, ok := err.(*peerError)
+ if !ok {
+ return DiscSubprotocolError
+ }
+ switch peerError.Code {
+ case errP2PVersionMismatch:
+ return DiscIncompatibleVersion
+ case errPubkeyMissing, errPubkeyInvalid:
+ return DiscInvalidIdentity
+ case errPubkeyForbidden:
+ return DiscUselessPeer
+ case errInvalidMsgCode, errMagicTokenMismatch, errProtocolBreach:
+ return DiscProtocolError
+ case errPingTimeout:
+ return DiscReadTimeout
+ case errRead, errWrite, errMisc:
+ return DiscNetworkError
+ default:
+ return DiscSubprotocolError
+ }
}
diff --git a/p2p/peer_error_handler.go b/p2p/peer_error_handler.go
deleted file mode 100644
index ca6cae4db..000000000
--- a/p2p/peer_error_handler.go
+++ /dev/null
@@ -1,101 +0,0 @@
-package p2p
-
-import (
- "net"
-)
-
-const (
- severityThreshold = 10
-)
-
-type DisconnectRequest struct {
- addr net.Addr
- reason DiscReason
-}
-
-type PeerErrorHandler struct {
- quit chan chan bool
- address net.Addr
- peerDisconnect chan DisconnectRequest
- severity int
- peerErrorChan chan *PeerError
- blacklist Blacklist
-}
-
-func NewPeerErrorHandler(address net.Addr, peerDisconnect chan DisconnectRequest, peerErrorChan chan *PeerError, blacklist Blacklist) *PeerErrorHandler {
- return &PeerErrorHandler{
- quit: make(chan chan bool),
- address: address,
- peerDisconnect: peerDisconnect,
- peerErrorChan: peerErrorChan,
- blacklist: blacklist,
- }
-}
-
-func (self *PeerErrorHandler) Start() {
- go self.listen()
-}
-
-func (self *PeerErrorHandler) Stop() {
- q := make(chan bool)
- self.quit <- q
- <-q
-}
-
-func (self *PeerErrorHandler) listen() {
- for {
- select {
- case peerError, ok := <-self.peerErrorChan:
- if ok {
- logger.Debugf("error %v\n", peerError)
- go self.handle(peerError)
- } else {
- return
- }
- case q := <-self.quit:
- q <- true
- return
- }
- }
-}
-
-func (self *PeerErrorHandler) handle(peerError *PeerError) {
- reason := DiscReason(' ')
- switch peerError.Code {
- case P2PVersionMismatch:
- reason = DiscIncompatibleVersion
- case PubkeyMissing, PubkeyInvalid:
- reason = DiscInvalidIdentity
- case PubkeyForbidden:
- reason = DiscUselessPeer
- case InvalidMsgCode, PacketTooShort, PayloadTooShort, MagicTokenMismatch, EmptyPayload, ProtocolBreach:
- reason = DiscProtocolError
- case PingTimeout:
- reason = DiscReadTimeout
- case WriteError, MiscError:
- reason = DiscNetworkError
- case InvalidGenesis, InvalidNetworkId, InvalidProtocolVersion:
- reason = DiscSubprotocolError
- default:
- self.severity += self.getSeverity(peerError)
- }
-
- if self.severity >= severityThreshold {
- reason = DiscSubprotocolError
- }
- if reason != DiscReason(' ') {
- self.peerDisconnect <- DisconnectRequest{
- addr: self.address,
- reason: reason,
- }
- }
-}
-
-func (self *PeerErrorHandler) getSeverity(peerError *PeerError) int {
- switch peerError.Code {
- case ReadError:
- return 4 //tolerate 3 :)
- default:
- return 1
- }
-}
diff --git a/p2p/peer_error_handler_test.go b/p2p/peer_error_handler_test.go
deleted file mode 100644
index 790a7443b..000000000
--- a/p2p/peer_error_handler_test.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package p2p
-
-import (
- // "fmt"
- "net"
- "testing"
- "time"
-)
-
-func TestPeerErrorHandler(t *testing.T) {
- address := &net.TCPAddr{IP: net.IP([]byte{1, 2, 3, 4}), Port: 30303}
- peerDisconnect := make(chan DisconnectRequest)
- peerErrorChan := NewPeerErrorChannel()
- peh := NewPeerErrorHandler(address, peerDisconnect, peerErrorChan, NewBlacklist())
- peh.Start()
- defer peh.Stop()
- for i := 0; i < 11; i++ {
- select {
- case <-peerDisconnect:
- t.Errorf("expected no disconnect request")
- default:
- }
- peerErrorChan <- NewPeerError(MiscError, "")
- }
- time.Sleep(1 * time.Millisecond)
- select {
- case request := <-peerDisconnect:
- if request.addr.String() != address.String() {
- t.Errorf("incorrect address %v != %v", request.addr, address)
- }
- default:
- t.Errorf("expected disconnect request")
- }
-}
diff --git a/p2p/peer_test.go b/p2p/peer_test.go
index c37540bef..d9640292f 100644
--- a/p2p/peer_test.go
+++ b/p2p/peer_test.go
@@ -1,96 +1,239 @@
package p2p
import (
+ "bufio"
"bytes"
- "fmt"
- // "net"
+ "encoding/hex"
+ "io/ioutil"
+ "net"
+ "reflect"
"testing"
"time"
)
-func TestPeer(t *testing.T) {
- handlers := make(Handlers)
- testProtocol := &TestProtocol{Msgs: []*Msg{}}
- handlers["aaa"] = func(p *Peer) Protocol { return testProtocol }
- handlers["ccc"] = func(p *Peer) Protocol { return testProtocol }
- addr := &TestAddr{"test:30"}
- conn := NewTestNetworkConnection(addr)
- _, server := SetupTestServer(handlers)
- server.Handshake()
- peer := NewPeer(conn, addr, true, server)
- // peer.Messenger().AddProtocols([]string{"aaa", "ccc"})
- peer.Start()
- defer peer.Stop()
- time.Sleep(2 * time.Millisecond)
- if len(conn.Out) != 1 {
- t.Errorf("handshake not sent")
- } else {
- out := conn.Out[0]
- packet := Packet(0, HandshakeMsg, P2PVersion, []byte(peer.server.identity.String()), []interface{}{peer.server.protocols}, peer.server.port, peer.server.identity.Pubkey()[1:])
- if bytes.Compare(out, packet) != 0 {
- t.Errorf("incorrect handshake packet %v != %v", out, packet)
- }
- }
-
- packet := Packet(0, HandshakeMsg, P2PVersion, []byte("peer"), []interface{}{"bbb", "aaa", "ccc"}, 30, []byte("0000000000000000000000000000000000000000000000000000000000000000"))
- conn.In(0, packet)
- time.Sleep(10 * time.Millisecond)
-
- pro, _ := peer.Messenger().protocols[0].(*BaseProtocol)
- if pro.state != handshakeReceived {
- t.Errorf("handshake not received")
- }
- if peer.Port != 30 {
- t.Errorf("port incorrectly set")
- }
- if peer.Id != "peer" {
- t.Errorf("id incorrectly set")
- }
- if string(peer.Pubkey) != "0000000000000000000000000000000000000000000000000000000000000000" {
- t.Errorf("pubkey incorrectly set")
- }
- fmt.Println(peer.Caps)
- if len(peer.Caps) != 3 || peer.Caps[0] != "aaa" || peer.Caps[1] != "bbb" || peer.Caps[2] != "ccc" {
- t.Errorf("protocols incorrectly set")
- }
-
- msg, _ := NewMsg(3)
- err := peer.Write("aaa", msg)
- if err != nil {
- t.Errorf("expect no error for known protocol: %v", err)
- } else {
- time.Sleep(1 * time.Millisecond)
- if len(conn.Out) != 2 {
- t.Errorf("msg not written")
- } else {
- out := conn.Out[1]
- packet := Packet(16, 3)
- if bytes.Compare(out, packet) != 0 {
- t.Errorf("incorrect packet %v != %v", out, packet)
+var discard = Protocol{
+ Name: "discard",
+ Length: 1,
+ Run: func(p *Peer, rw MsgReadWriter) error {
+ for {
+ msg, err := rw.ReadMsg()
+ if err != nil {
+ return err
+ }
+ if err = msg.Discard(); err != nil {
+ return err
}
}
- }
+ },
+}
- msg, _ = NewMsg(2)
- err = peer.Write("ccc", msg)
- if err != nil {
- t.Errorf("expect no error for known protocol: %v", err)
- } else {
- time.Sleep(1 * time.Millisecond)
- if len(conn.Out) != 3 {
- t.Errorf("msg not written")
- } else {
- out := conn.Out[2]
- packet := Packet(21, 2)
- if bytes.Compare(out, packet) != 0 {
- t.Errorf("incorrect packet %v != %v", out, packet)
+func testPeer(protos []Protocol) (net.Conn, *Peer, <-chan error) {
+ conn1, conn2 := net.Pipe()
+ id := NewSimpleClientIdentity("test", "0", "0", "public key")
+ peer := newPeer(conn1, protos, nil)
+ peer.ourID = id
+ peer.pubkeyHook = func(*peerAddr) error { return nil }
+ errc := make(chan error, 1)
+ go func() {
+ _, err := peer.loop()
+ errc <- err
+ }()
+ return conn2, 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 {
+ msg, err := rw.ReadMsg()
+ if err != nil {
+ t.Errorf("read error: %v", err)
}
- }
+ if msg.Code != 2 {
+ t.Errorf("incorrect msg code %d relayed to protocol", msg.Code)
+ }
+ data, err := ioutil.ReadAll(msg.Payload)
+ if err != nil {
+ t.Errorf("payload read error: %v", err)
+ }
+ expdata, _ := hex.DecodeString("0183303030")
+ if !bytes.Equal(expdata, data) {
+ t.Errorf("incorrect msg data %x", data)
+ }
+ close(done)
+ return nil
+ },
}
- err = peer.Write("bbb", msg)
- time.Sleep(1 * time.Millisecond)
- if err == nil {
- t.Errorf("expect error for unknown protocol")
+ net, peer, errc := testPeer([]Protocol{proto})
+ defer net.Close()
+ peer.startSubprotocols([]Cap{proto.cap()})
+
+ writeMsg(net, NewMsg(18, 1, "000"))
+ 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
+ },
+ }
+
+ net, peer, errc := testPeer([]Protocol{proto})
+ defer net.Close()
+ peer.startSubprotocols([]Cap{proto.cap()})
+
+ writeMsg(net, NewMsg(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 := rw.EncodeMsg(2); err == nil {
+ t.Error("expected error for out-of-range msg code, got nil")
+ }
+ if err := rw.EncodeMsg(1); err != nil {
+ t.Errorf("write error: %v", err)
+ }
+ return nil
+ },
+ }
+ net, peer, _ := testPeer([]Protocol{proto})
+ defer net.Close()
+ peer.startSubprotocols([]Cap{proto.cap()})
+
+ bufr := bufio.NewReader(net)
+ msg, err := readMsg(bufr)
+ if err != nil {
+ t.Errorf("read error: %v", err)
+ }
+ if msg.Code != 17 {
+ t.Errorf("incorrect message code: got %d, expected %d", msg.Code, 17)
+ }
+}
+
+func TestPeerWrite(t *testing.T) {
+ defer testlog(t).detach()
+
+ net, peer, peerErr := testPeer([]Protocol{discard})
+ defer net.Close()
+ peer.startSubprotocols([]Cap{discard.cap()})
+
+ // 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() {
+ bufr := bufio.NewReader(net)
+ msg, err := readMsg(bufr)
+ if err != nil {
+ t.Errorf("read error: %v", err)
+ } else if msg.Code != 16 {
+ t.Errorf("wrong code, got %d, expected %d", msg.Code, 16)
+ }
+ msg.Discard()
+ close(read)
+ }()
+
+ // test succcessful 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 TestPeerActivity(t *testing.T) {
+ // shorten inactivityTimeout while this test is running
+ oldT := inactivityTimeout
+ defer func() { inactivityTimeout = oldT }()
+ inactivityTimeout = 20 * time.Millisecond
+
+ net, peer, peerErr := testPeer([]Protocol{discard})
+ defer net.Close()
+ peer.startSubprotocols([]Cap{discard.cap()})
+
+ sub := peer.activity.Subscribe(time.Time{})
+ defer sub.Unsubscribe()
+
+ for i := 0; i < 6; i++ {
+ writeMsg(net, NewMsg(16))
+ select {
+ case <-sub.Chan():
+ case <-time.After(inactivityTimeout / 2):
+ t.Fatal("no event within ", inactivityTimeout/2)
+ case err := <-peerErr:
+ t.Fatal("peer error", err)
+ }
+ }
+
+ select {
+ case <-time.After(inactivityTimeout * 2):
+ case <-sub.Chan():
+ t.Fatal("got activity event while connection was inactive")
+ case err := <-peerErr:
+ t.Fatal("peer error", err)
+ }
+}
+
+func TestNewPeer(t *testing.T) {
+ id := NewSimpleClientIdentity("clientid", "version", "customid", "pubkey")
+ caps := []Cap{{"foo", 2}, {"bar", 3}}
+ p := NewPeer(id, caps)
+ if !reflect.DeepEqual(p.Caps(), caps) {
+ t.Errorf("Caps mismatch: got %v, expected %v", p.Caps(), caps)
+ }
+ if p.Identity() != id {
+ t.Errorf("Identity mismatch: got %v, expected %v", p.Identity(), id)
+ }
+ // Should not hang.
+ p.Disconnect(DiscAlreadyConnected)
+}
diff --git a/p2p/protocol.go b/p2p/protocol.go
index 5d05ced7d..28eab87cd 100644
--- a/p2p/protocol.go
+++ b/p2p/protocol.go
@@ -2,277 +2,294 @@ package p2p
import (
"bytes"
- "fmt"
- "net"
- "sort"
- "sync"
"time"
+
+ "github.com/ethereum/go-ethereum/ethutil"
)
-type Protocol interface {
- Start()
- Stop()
- HandleIn(*Msg, chan *Msg)
- HandleOut(*Msg) bool
- Offset() MsgCode
- Name() string
+// Protocol represents a P2P subprotocol implementation.
+type Protocol struct {
+ // Name should contain the official protocol name,
+ // often a three-letter word.
+ Name string
+
+ // Version should contain the version number of the protocol.
+ Version uint
+
+ // Length should contain the number of message codes used
+ // by the protocol.
+ Length uint64
+
+ // Run is called in a new groutine when the protocol has been
+ // negotiated with a peer. It should read and write messages from
+ // rw. The Payload for each message must be fully consumed.
+ //
+ // The peer connection is closed when Start returns. It should return
+ // any protocol-level error (such as an I/O error) that is
+ // encountered.
+ Run func(peer *Peer, rw MsgReadWriter) error
+}
+
+func (p Protocol) cap() Cap {
+ return Cap{p.Name, p.Version}
}
const (
- P2PVersion = 0
- pingTimeout = 2
- pingGracePeriod = 2
+ baseProtocolVersion = 2
+ baseProtocolLength = uint64(16)
+ baseProtocolMaxMsgSize = 10 * 1024 * 1024
)
const (
- HandshakeMsg = iota
- DiscMsg
- PingMsg
- PongMsg
- GetPeersMsg
- PeersMsg
- offset = 16
+ // devp2p message codes
+ handshakeMsg = 0x00
+ discMsg = 0x01
+ pingMsg = 0x02
+ pongMsg = 0x03
+ getPeersMsg = 0x04
+ peersMsg = 0x05
)
-type ProtocolState uint8
-
-const (
- nullState = iota
- handshakeReceived
-)
-
-type DiscReason byte
-
-const (
- // Values are given explicitly instead of by iota because these values are
- // defined by the wire protocol spec; it is easier for humans to ensure
- // correctness when values are explicit.
- DiscRequested = 0x00
- DiscNetworkError = 0x01
- DiscProtocolError = 0x02
- DiscUselessPeer = 0x03
- DiscTooManyPeers = 0x04
- DiscAlreadyConnected = 0x05
- DiscIncompatibleVersion = 0x06
- DiscInvalidIdentity = 0x07
- DiscQuitting = 0x08
- DiscUnexpectedIdentity = 0x09
- DiscSelf = 0x0a
- DiscReadTimeout = 0x0b
- DiscSubprotocolError = 0x10
-)
-
-var discReasonToString = map[DiscReason]string{
- DiscRequested: "Disconnect requested",
- DiscNetworkError: "Network error",
- DiscProtocolError: "Breach of protocol",
- DiscUselessPeer: "Useless peer",
- DiscTooManyPeers: "Too many peers",
- DiscAlreadyConnected: "Already connected",
- DiscIncompatibleVersion: "Incompatible P2P protocol version",
- DiscInvalidIdentity: "Invalid node identity",
- DiscQuitting: "Client quitting",
- DiscUnexpectedIdentity: "Unexpected identity",
- DiscSelf: "Connected to self",
- DiscReadTimeout: "Read timeout",
- DiscSubprotocolError: "Subprotocol error",
+// handshake is the structure of a handshake list.
+type handshake struct {
+ Version uint64
+ ID string
+ Caps []Cap
+ ListenPort uint64
+ NodeID []byte
}
-func (d DiscReason) String() string {
- if len(discReasonToString) < int(d) {
- return "Unknown"
+func (h *handshake) String() string {
+ return h.ID
+}
+func (h *handshake) Pubkey() []byte {
+ return h.NodeID
+}
+
+// Cap is the structure of a peer capability.
+type Cap struct {
+ Name string
+ Version uint
+}
+
+func (cap Cap) RlpData() interface{} {
+ return []interface{}{cap.Name, cap.Version}
+}
+
+type capsByName []Cap
+
+func (cs capsByName) Len() int { return len(cs) }
+func (cs capsByName) Less(i, j int) bool { return cs[i].Name < cs[j].Name }
+func (cs capsByName) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
+
+type baseProtocol struct {
+ rw MsgReadWriter
+ peer *Peer
+}
+
+func runBaseProtocol(peer *Peer, rw MsgReadWriter) error {
+ bp := &baseProtocol{rw, peer}
+ if err := bp.doHandshake(rw); err != nil {
+ return err
}
-
- return discReasonToString[d]
-}
-
-type BaseProtocol struct {
- peer *Peer
- state ProtocolState
- stateLock sync.RWMutex
-}
-
-func NewBaseProtocol(peer *Peer) *BaseProtocol {
- self := &BaseProtocol{
- peer: peer,
- }
-
- return self
-}
-
-func (self *BaseProtocol) Start() {
- if self.peer != nil {
- self.peer.Write("", self.peer.Server().Handshake())
- go self.peer.Messenger().PingPong(
- pingTimeout*time.Second,
- pingGracePeriod*time.Second,
- self.Ping,
- self.Timeout,
- )
- }
-}
-
-func (self *BaseProtocol) Stop() {
-}
-
-func (self *BaseProtocol) Ping() {
- msg, _ := NewMsg(PingMsg)
- self.peer.Write("", msg)
-}
-
-func (self *BaseProtocol) Timeout() {
- self.peerError(PingTimeout, "")
-}
-
-func (self *BaseProtocol) Name() string {
- return ""
-}
-
-func (self *BaseProtocol) Offset() MsgCode {
- return offset
-}
-
-func (self *BaseProtocol) CheckState(state ProtocolState) bool {
- self.stateLock.RLock()
- self.stateLock.RUnlock()
- if self.state != state {
- return false
- } else {
- return true
- }
-}
-
-func (self *BaseProtocol) HandleIn(msg *Msg, response chan *Msg) {
- if msg.Code() == HandshakeMsg {
- self.handleHandshake(msg)
- } else {
- if !self.CheckState(handshakeReceived) {
- self.peerError(ProtocolBreach, "message code %v not allowed", msg.Code())
- close(response)
- return
+ // run main loop
+ quit := make(chan error, 1)
+ go func() {
+ for {
+ if err := bp.handle(rw); err != nil {
+ quit <- err
+ break
+ }
}
- switch msg.Code() {
- case DiscMsg:
- logger.Infof("Disconnect requested from peer %v, reason", DiscReason(msg.Data().Get(0).Uint()))
- self.peer.Server().PeerDisconnect() <- DisconnectRequest{
- addr: self.peer.Address,
- reason: DiscRequested,
+ }()
+ return bp.loop(quit)
+}
+
+var pingTimeout = 2 * time.Second
+
+func (bp *baseProtocol) loop(quit <-chan error) error {
+ ping := time.NewTimer(pingTimeout)
+ activity := bp.peer.activity.Subscribe(time.Time{})
+ lastActive := time.Time{}
+ defer ping.Stop()
+ defer activity.Unsubscribe()
+
+ getPeersTick := time.NewTicker(10 * time.Second)
+ defer getPeersTick.Stop()
+ err := bp.rw.EncodeMsg(getPeersMsg)
+
+ for err == nil {
+ select {
+ case err = <-quit:
+ return err
+ case <-getPeersTick.C:
+ err = bp.rw.EncodeMsg(getPeersMsg)
+ case event := <-activity.Chan():
+ ping.Reset(pingTimeout)
+ lastActive = event.(time.Time)
+ case t := <-ping.C:
+ if lastActive.Add(pingTimeout * 2).Before(t) {
+ err = newPeerError(errPingTimeout, "")
+ } else if lastActive.Add(pingTimeout).Before(t) {
+ err = bp.rw.EncodeMsg(pingMsg)
}
- case PingMsg:
- out, _ := NewMsg(PongMsg)
- response <- out
- case PongMsg:
- case GetPeersMsg:
- // Peer asked for list of connected peers
- if out, err := self.peer.Server().PeersMessage(); err != nil {
- response <- out
- }
- case PeersMsg:
- self.handlePeers(msg)
- default:
- self.peerError(InvalidMsgCode, "unknown message code %v", msg.Code())
}
}
- close(response)
+ return err
}
-func (self *BaseProtocol) HandleOut(msg *Msg) (allowed bool) {
- // somewhat overly paranoid
- allowed = msg.Code() == HandshakeMsg || msg.Code() == DiscMsg || msg.Code() < self.Offset() && self.CheckState(handshakeReceived)
- return
-}
-
-func (self *BaseProtocol) peerError(errorCode ErrorCode, format string, v ...interface{}) {
- err := NewPeerError(errorCode, format, v...)
- logger.Warnln(err)
- fmt.Println(self.peer, err)
- if self.peer != nil {
- self.peer.PeerErrorChan() <- err
+func (bp *baseProtocol) handle(rw MsgReadWriter) error {
+ msg, err := rw.ReadMsg()
+ if err != nil {
+ return err
}
-}
-
-func (self *BaseProtocol) handlePeers(msg *Msg) {
- it := msg.Data().NewIterator()
- for it.Next() {
- ip := net.IP(it.Value().Get(0).Bytes())
- port := it.Value().Get(1).Uint()
- address := &net.TCPAddr{IP: ip, Port: int(port)}
- go self.peer.Server().PeerConnect(address)
+ if msg.Size > baseProtocolMaxMsgSize {
+ return newPeerError(errMisc, "message too big")
}
+ // make sure that the payload has been fully consumed
+ defer msg.Discard()
+
+ switch msg.Code {
+ case handshakeMsg:
+ return newPeerError(errProtocolBreach, "extra handshake received")
+
+ case discMsg:
+ var reason DiscReason
+ if err := msg.Decode(&reason); err != nil {
+ return err
+ }
+ bp.peer.Disconnect(reason)
+ return nil
+
+ case pingMsg:
+ return bp.rw.EncodeMsg(pongMsg)
+
+ case pongMsg:
+
+ case getPeersMsg:
+ peers := bp.peerList()
+ // this is dangerous. the spec says that we should _delay_
+ // sending the response if no new information is available.
+ // this means that would need to send a response later when
+ // new peers become available.
+ //
+ // TODO: add event mechanism to notify baseProtocol for new peers
+ if len(peers) > 0 {
+ return bp.rw.EncodeMsg(peersMsg, peers)
+ }
+
+ case peersMsg:
+ var peers []*peerAddr
+ if err := msg.Decode(&peers); err != nil {
+ return err
+ }
+ for _, addr := range peers {
+ bp.peer.Debugf("received peer suggestion: %v", addr)
+ bp.peer.newPeerAddr <- addr
+ }
+
+ default:
+ return newPeerError(errInvalidMsgCode, "unknown message code %v", msg.Code)
+ }
+ return nil
}
-func (self *BaseProtocol) handleHandshake(msg *Msg) {
- self.stateLock.Lock()
- defer self.stateLock.Unlock()
- if self.state != nullState {
- self.peerError(ProtocolBreach, "extra handshake")
- return
+func (bp *baseProtocol) doHandshake(rw MsgReadWriter) error {
+ // send our handshake
+ if err := rw.WriteMsg(bp.handshakeMsg()); err != nil {
+ return err
}
- c := msg.Data()
+ // read and handle remote handshake
+ msg, err := rw.ReadMsg()
+ if err != nil {
+ return err
+ }
+ if msg.Code != handshakeMsg {
+ return newPeerError(errProtocolBreach, "first message must be handshake, got %x", msg.Code)
+ }
+ if msg.Size > baseProtocolMaxMsgSize {
+ return newPeerError(errMisc, "message too big")
+ }
+ var hs handshake
+ if err := msg.Decode(&hs); err != nil {
+ return err
+ }
+
+ // validate handshake info
+ if hs.Version != baseProtocolVersion {
+ return newPeerError(errP2PVersionMismatch, "Require protocol %d, received %d\n",
+ baseProtocolVersion, hs.Version)
+ }
+ if len(hs.NodeID) == 0 {
+ return newPeerError(errPubkeyMissing, "")
+ }
+ if len(hs.NodeID) != 64 {
+ return newPeerError(errPubkeyInvalid, "require 512 bit, got %v", len(hs.NodeID)*8)
+ }
+ if da := bp.peer.dialAddr; da != nil {
+ // verify that the peer we wanted to connect to
+ // actually holds the target public key.
+ if da.Pubkey != nil && !bytes.Equal(da.Pubkey, hs.NodeID) {
+ return newPeerError(errPubkeyForbidden, "dial address pubkey mismatch")
+ }
+ }
+ pa := newPeerAddr(bp.peer.conn.RemoteAddr(), hs.NodeID)
+ if err := bp.peer.pubkeyHook(pa); err != nil {
+ return newPeerError(errPubkeyForbidden, "%v", err)
+ }
+
+ // TODO: remove Caps with empty name
+
+ var addr *peerAddr
+ if hs.ListenPort != 0 {
+ addr = newPeerAddr(bp.peer.conn.RemoteAddr(), hs.NodeID)
+ addr.Port = hs.ListenPort
+ }
+ bp.peer.setHandshakeInfo(&hs, addr, hs.Caps)
+ bp.peer.startSubprotocols(hs.Caps)
+ return nil
+}
+
+func (bp *baseProtocol) handshakeMsg() Msg {
var (
- p2pVersion = c.Get(0).Uint()
- id = c.Get(1).Str()
- caps = c.Get(2)
- port = c.Get(3).Uint()
- pubkey = c.Get(4).Bytes()
+ port uint64
+ caps []interface{}
)
- fmt.Printf("handshake received %v, %v, %v, %v, %v ", p2pVersion, id, caps, port, pubkey)
-
- // Check correctness of p2p protocol version
- if p2pVersion != P2PVersion {
- self.peerError(P2PVersionMismatch, "Require protocol %d, received %d\n", P2PVersion, p2pVersion)
- return
+ if bp.peer.ourListenAddr != nil {
+ port = bp.peer.ourListenAddr.Port
}
-
- // Handle the pub key (validation, uniqueness)
- if len(pubkey) == 0 {
- self.peerError(PubkeyMissing, "not supplied in handshake.")
- return
+ for _, proto := range bp.peer.protocols {
+ caps = append(caps, proto.cap())
}
-
- if len(pubkey) != 64 {
- self.peerError(PubkeyInvalid, "require 512 bit, got %v", len(pubkey)*8)
- return
- }
-
- // Self connect detection
- if bytes.Compare(self.peer.Server().ClientIdentity().Pubkey()[1:], pubkey) == 0 {
- self.peerError(PubkeyForbidden, "not allowed to connect to self")
- return
- }
-
- // register pubkey on server. this also sets the pubkey on the peer (need lock)
- if err := self.peer.Server().RegisterPubkey(self.peer, pubkey); err != nil {
- self.peerError(PubkeyForbidden, err.Error())
- return
- }
-
- // check port
- if self.peer.Inbound {
- uint16port := uint16(port)
- if self.peer.Port > 0 && self.peer.Port != uint16port {
- self.peerError(PortMismatch, "port mismatch: %v != %v", self.peer.Port, port)
- return
- } else {
- self.peer.Port = uint16port
- }
- }
-
- capsIt := caps.NewIterator()
- for capsIt.Next() {
- cap := capsIt.Value().Str()
- self.peer.Caps = append(self.peer.Caps, cap)
- }
- sort.Strings(self.peer.Caps)
- self.peer.Messenger().AddProtocols(self.peer.Caps)
-
- self.peer.Id = id
-
- self.state = handshakeReceived
-
- //p.ethereum.PushPeer(p)
- // p.ethereum.reactor.Post("peerList", p.ethereum.Peers())
- return
+ return NewMsg(handshakeMsg,
+ baseProtocolVersion,
+ bp.peer.ourID.String(),
+ caps,
+ port,
+ bp.peer.ourID.Pubkey()[1:],
+ )
+}
+
+func (bp *baseProtocol) peerList() []ethutil.RlpEncodable {
+ peers := bp.peer.otherPeers()
+ ds := make([]ethutil.RlpEncodable, 0, len(peers))
+ for _, p := range peers {
+ p.infolock.Lock()
+ addr := p.listenAddr
+ p.infolock.Unlock()
+ // filter out this peer and peers that are not listening or
+ // have not completed the handshake.
+ // TODO: track previously sent peers and exclude them as well.
+ if p == bp.peer || addr == nil {
+ continue
+ }
+ ds = append(ds, addr)
+ }
+ ourAddr := bp.peer.ourListenAddr
+ if ourAddr != nil && !ourAddr.IP.IsLoopback() && !ourAddr.IP.IsUnspecified() {
+ ds = append(ds, ourAddr)
+ }
+ return ds
}
diff --git a/p2p/server.go b/p2p/server.go
index 91bc4af5c..8a6087566 100644
--- a/p2p/server.go
+++ b/p2p/server.go
@@ -2,21 +2,420 @@ package p2p
import (
"bytes"
+ "errors"
"fmt"
"net"
- "sort"
- "strconv"
"sync"
"time"
- logpkg "github.com/ethereum/go-ethereum/logger"
+ "github.com/ethereum/go-ethereum/logger"
)
const (
- outboundAddressPoolSize = 10
- disconnectGracePeriod = 2
+ outboundAddressPoolSize = 500
+ defaultDialTimeout = 10 * time.Second
+ portMappingUpdateInterval = 15 * time.Minute
+ portMappingTimeout = 20 * time.Minute
)
+var srvlog = logger.NewLogger("P2P Server")
+
+// Server manages all peer connections.
+//
+// The fields of Server are used as configuration parameters.
+// You should set them before starting the Server. Fields may not be
+// modified while the server is running.
+type Server struct {
+ // This field must be set to a valid client identity.
+ Identity ClientIdentity
+
+ // MaxPeers is the maximum number of peers that can be
+ // connected. It must be greater than zero.
+ MaxPeers int
+
+ // Protocols should contain the protocols supported
+ // by the server. Matching protocols are launched for
+ // each peer.
+ Protocols []Protocol
+
+ // If Blacklist is set to a non-nil value, the given Blacklist
+ // is used to verify peer connections.
+ Blacklist Blacklist
+
+ // If ListenAddr is set to a non-nil address, the server
+ // will listen for incoming connections.
+ //
+ // If the port is zero, the operating system will pick a port. The
+ // ListenAddr field will be updated with the actual address when
+ // the server is started.
+ ListenAddr string
+
+ // If set to a non-nil value, the given NAT port mapper
+ // is used to make the listening port available to the
+ // Internet.
+ NAT NAT
+
+ // If Dialer is set to a non-nil value, the given Dialer
+ // is used to dial outbound peer connections.
+ Dialer *net.Dialer
+
+ // If NoDial is true, the server will not dial any peers.
+ NoDial bool
+
+ // Hook for testing. This is useful because we can inhibit
+ // the whole protocol stack.
+ newPeerFunc peerFunc
+
+ lock sync.RWMutex
+ running bool
+ listener net.Listener
+ laddr *net.TCPAddr // real listen addr
+ peers []*Peer
+ peerSlots chan int
+ peerCount int
+
+ quit chan struct{}
+ wg sync.WaitGroup
+ peerConnect chan *peerAddr
+ peerDisconnect chan *Peer
+}
+
+// NAT is implemented by NAT traversal methods.
+type NAT interface {
+ GetExternalAddress() (net.IP, error)
+ AddPortMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error
+ DeletePortMapping(protocol string, extport, intport int) error
+
+ // Should return name of the method.
+ String() string
+}
+
+type peerFunc func(srv *Server, c net.Conn, dialAddr *peerAddr) *Peer
+
+// Peers returns all connected peers.
+func (srv *Server) Peers() (peers []*Peer) {
+ srv.lock.RLock()
+ defer srv.lock.RUnlock()
+ for _, peer := range srv.peers {
+ if peer != nil {
+ peers = append(peers, peer)
+ }
+ }
+ return
+}
+
+// PeerCount returns the number of connected peers.
+func (srv *Server) PeerCount() int {
+ srv.lock.RLock()
+ defer srv.lock.RUnlock()
+ return srv.peerCount
+}
+
+// SuggestPeer injects an address into the outbound address pool.
+func (srv *Server) SuggestPeer(ip net.IP, port int, nodeID []byte) {
+ select {
+ case srv.peerConnect <- &peerAddr{ip, uint64(port), nodeID}:
+ default: // don't block
+ }
+}
+
+// Broadcast sends an RLP-encoded message to all connected peers.
+// This method is deprecated and will be removed later.
+func (srv *Server) Broadcast(protocol string, code uint64, data ...interface{}) {
+ var payload []byte
+ if data != nil {
+ payload = encodePayload(data...)
+ }
+ srv.lock.RLock()
+ defer srv.lock.RUnlock()
+ for _, peer := range srv.peers {
+ if peer != nil {
+ var msg = Msg{Code: code}
+ if data != nil {
+ msg.Payload = bytes.NewReader(payload)
+ msg.Size = uint32(len(payload))
+ }
+ peer.writeProtoMsg(protocol, msg)
+ }
+ }
+}
+
+// Start starts running the server.
+// Servers can be re-used and started again after stopping.
+func (srv *Server) Start() (err error) {
+ srv.lock.Lock()
+ defer srv.lock.Unlock()
+ if srv.running {
+ return errors.New("server already running")
+ }
+ srvlog.Infoln("Starting Server")
+
+ // initialize fields
+ if srv.Identity == nil {
+ return fmt.Errorf("Server.Identity must be set to a non-nil identity")
+ }
+ if srv.MaxPeers <= 0 {
+ return fmt.Errorf("Server.MaxPeers must be > 0")
+ }
+ srv.quit = make(chan struct{})
+ srv.peers = make([]*Peer, srv.MaxPeers)
+ srv.peerSlots = make(chan int, srv.MaxPeers)
+ srv.peerConnect = make(chan *peerAddr, outboundAddressPoolSize)
+ srv.peerDisconnect = make(chan *Peer)
+ if srv.newPeerFunc == nil {
+ srv.newPeerFunc = newServerPeer
+ }
+ if srv.Blacklist == nil {
+ srv.Blacklist = NewBlacklist()
+ }
+ if srv.Dialer == nil {
+ srv.Dialer = &net.Dialer{Timeout: defaultDialTimeout}
+ }
+
+ if srv.ListenAddr != "" {
+ if err := srv.startListening(); err != nil {
+ return err
+ }
+ }
+ if !srv.NoDial {
+ srv.wg.Add(1)
+ go srv.dialLoop()
+ }
+ if srv.NoDial && srv.ListenAddr == "" {
+ srvlog.Warnln("I will be kind-of useless, neither dialing nor listening.")
+ }
+
+ // make all slots available
+ for i := range srv.peers {
+ srv.peerSlots <- i
+ }
+ // note: discLoop is not part of WaitGroup
+ go srv.discLoop()
+ srv.running = true
+ return nil
+}
+
+func (srv *Server) startListening() error {
+ listener, err := net.Listen("tcp", srv.ListenAddr)
+ if err != nil {
+ return err
+ }
+ srv.ListenAddr = listener.Addr().String()
+ srv.laddr = listener.Addr().(*net.TCPAddr)
+ srv.listener = listener
+ srv.wg.Add(1)
+ go srv.listenLoop()
+ if !srv.laddr.IP.IsLoopback() && srv.NAT != nil {
+ srv.wg.Add(1)
+ go srv.natLoop(srv.laddr.Port)
+ }
+ return nil
+}
+
+// Stop terminates the server and all active peer connections.
+// It blocks until all active connections have been closed.
+func (srv *Server) Stop() {
+ srv.lock.Lock()
+ if !srv.running {
+ srv.lock.Unlock()
+ return
+ }
+ srv.running = false
+ srv.lock.Unlock()
+
+ srvlog.Infoln("Stopping server")
+ if srv.listener != nil {
+ // this unblocks listener Accept
+ srv.listener.Close()
+ }
+ close(srv.quit)
+ for _, peer := range srv.Peers() {
+ peer.Disconnect(DiscQuitting)
+ }
+ srv.wg.Wait()
+
+ // wait till they actually disconnect
+ // this is checked by claiming all peerSlots.
+ // slots become available as the peers disconnect.
+ for i := 0; i < cap(srv.peerSlots); i++ {
+ <-srv.peerSlots
+ }
+ // terminate discLoop
+ close(srv.peerDisconnect)
+}
+
+func (srv *Server) discLoop() {
+ for peer := range srv.peerDisconnect {
+ // peer has just disconnected. free up its slot.
+ srvlog.Infof("%v is gone", peer)
+ srv.peerSlots <- peer.slot
+ srv.lock.Lock()
+ srv.peers[peer.slot] = nil
+ srv.lock.Unlock()
+ }
+}
+
+// main loop for adding connections via listening
+func (srv *Server) listenLoop() {
+ defer srv.wg.Done()
+
+ srvlog.Infoln("Listening on", srv.listener.Addr())
+ for {
+ select {
+ case slot := <-srv.peerSlots:
+ conn, err := srv.listener.Accept()
+ if err != nil {
+ srv.peerSlots <- slot
+ return
+ }
+ srvlog.Debugf("Accepted conn %v (slot %d)\n", conn.RemoteAddr(), slot)
+ srv.addPeer(conn, nil, slot)
+ case <-srv.quit:
+ return
+ }
+ }
+}
+
+func (srv *Server) natLoop(port int) {
+ defer srv.wg.Done()
+ for {
+ srv.updatePortMapping(port)
+ select {
+ case <-time.After(portMappingUpdateInterval):
+ // one more round
+ case <-srv.quit:
+ srv.removePortMapping(port)
+ return
+ }
+ }
+}
+
+func (srv *Server) updatePortMapping(port int) {
+ srvlog.Infoln("Attempting to map port", port, "with", srv.NAT)
+ err := srv.NAT.AddPortMapping("tcp", port, port, "ethereum p2p", portMappingTimeout)
+ if err != nil {
+ srvlog.Errorln("Port mapping error:", err)
+ return
+ }
+ extip, err := srv.NAT.GetExternalAddress()
+ if err != nil {
+ srvlog.Errorln("Error getting external IP:", err)
+ return
+ }
+ srv.lock.Lock()
+ extaddr := *(srv.listener.Addr().(*net.TCPAddr))
+ extaddr.IP = extip
+ srvlog.Infoln("Mapped port, external addr is", &extaddr)
+ srv.laddr = &extaddr
+ srv.lock.Unlock()
+}
+
+func (srv *Server) removePortMapping(port int) {
+ srvlog.Infoln("Removing port mapping for", port, "with", srv.NAT)
+ srv.NAT.DeletePortMapping("tcp", port, port)
+}
+
+func (srv *Server) dialLoop() {
+ defer srv.wg.Done()
+ var (
+ suggest chan *peerAddr
+ slot *int
+ slots = srv.peerSlots
+ )
+ for {
+ select {
+ case i := <-slots:
+ // we need a peer in slot i, slot reserved
+ slot = &i
+ // now we can watch for candidate peers in the next loop
+ suggest = srv.peerConnect
+ // do not consume more until candidate peer is found
+ slots = nil
+
+ case desc := <-suggest:
+ // candidate peer found, will dial out asyncronously
+ // if connection fails slot will be released
+ go srv.dialPeer(desc, *slot)
+ // we can watch if more peers needed in the next loop
+ slots = srv.peerSlots
+ // until then we dont care about candidate peers
+ suggest = nil
+
+ case <-srv.quit:
+ // give back the currently reserved slot
+ if slot != nil {
+ srv.peerSlots <- *slot
+ }
+ return
+ }
+ }
+}
+
+// connect to peer via dial out
+func (srv *Server) dialPeer(desc *peerAddr, slot int) {
+ srvlog.Debugf("Dialing %v (slot %d)\n", desc, slot)
+ conn, err := srv.Dialer.Dial(desc.Network(), desc.String())
+ if err != nil {
+ srvlog.Errorf("Dial error: %v", err)
+ srv.peerSlots <- slot
+ return
+ }
+ go srv.addPeer(conn, desc, slot)
+}
+
+// creates the new peer object and inserts it into its slot
+func (srv *Server) addPeer(conn net.Conn, desc *peerAddr, slot int) *Peer {
+ srv.lock.Lock()
+ defer srv.lock.Unlock()
+ if !srv.running {
+ conn.Close()
+ srv.peerSlots <- slot // release slot
+ return nil
+ }
+ peer := srv.newPeerFunc(srv, conn, desc)
+ peer.slot = slot
+ srv.peers[slot] = peer
+ srv.peerCount++
+ go func() { peer.loop(); srv.peerDisconnect <- peer }()
+ return peer
+}
+
+// removes peer: sending disconnect msg, stop peer, remove rom list/table, release slot
+func (srv *Server) removePeer(peer *Peer) {
+ srv.lock.Lock()
+ defer srv.lock.Unlock()
+ srvlog.Debugf("Removing peer %v %v (slot %v)\n", peer, peer.slot)
+ if srv.peers[peer.slot] != peer {
+ srvlog.Warnln("Invalid peer to remove:", peer)
+ return
+ }
+ // remove from list and index
+ srv.peerCount--
+ srv.peers[peer.slot] = nil
+ // release slot to signal need for a new peer, last!
+ srv.peerSlots <- peer.slot
+}
+
+func (srv *Server) verifyPeer(addr *peerAddr) error {
+ if srv.Blacklist.Exists(addr.Pubkey) {
+ return errors.New("blacklisted")
+ }
+ if bytes.Equal(srv.Identity.Pubkey()[1:], addr.Pubkey) {
+ return newPeerError(errPubkeyForbidden, "not allowed to connect to srv")
+ }
+ srv.lock.RLock()
+ defer srv.lock.RUnlock()
+ for _, peer := range srv.peers {
+ if peer != nil {
+ id := peer.Identity()
+ if id != nil && bytes.Equal(id.Pubkey(), addr.Pubkey) {
+ return errors.New("already connected")
+ }
+ }
+ }
+ return nil
+}
+
type Blacklist interface {
Get([]byte) (bool, error)
Put([]byte) error
@@ -66,419 +465,3 @@ func (self *BlacklistMap) Delete(pubkey []byte) error {
delete(self.blacklist, string(pubkey))
return nil
}
-
-type Server struct {
- network Network
- listening bool //needed?
- dialing bool //needed?
- closed bool
- identity ClientIdentity
- addr net.Addr
- port uint16
- protocols []string
-
- quit chan chan bool
- peersLock sync.RWMutex
-
- maxPeers int
- peers []*Peer
- peerSlots chan int
- peersTable map[string]int
- peersMsg *Msg
- peerCount int
-
- peerConnect chan net.Addr
- peerDisconnect chan DisconnectRequest
- blacklist Blacklist
- handlers Handlers
-}
-
-var logger = logpkg.NewLogger("P2P")
-
-func New(network Network, addr net.Addr, identity ClientIdentity, handlers Handlers, maxPeers int, blacklist Blacklist) *Server {
- // get alphabetical list of protocol names from handlers map
- protocols := []string{}
- for protocol := range handlers {
- protocols = append(protocols, protocol)
- }
- sort.Strings(protocols)
-
- _, port, _ := net.SplitHostPort(addr.String())
- intport, _ := strconv.Atoi(port)
-
- self := &Server{
- // NewSimpleClientIdentity(clientIdentifier, version, customIdentifier)
- network: network,
- identity: identity,
- addr: addr,
- port: uint16(intport),
- protocols: protocols,
-
- quit: make(chan chan bool),
-
- maxPeers: maxPeers,
- peers: make([]*Peer, maxPeers),
- peerSlots: make(chan int, maxPeers),
- peersTable: make(map[string]int),
-
- peerConnect: make(chan net.Addr, outboundAddressPoolSize),
- peerDisconnect: make(chan DisconnectRequest),
- blacklist: blacklist,
-
- handlers: handlers,
- }
- for i := 0; i < maxPeers; i++ {
- self.peerSlots <- i // fill up with indexes
- }
- return self
-}
-
-func (self *Server) NewAddr(host string, port int) (addr net.Addr, err error) {
- addr, err = self.network.NewAddr(host, port)
- return
-}
-
-func (self *Server) ParseAddr(address string) (addr net.Addr, err error) {
- addr, err = self.network.ParseAddr(address)
- return
-}
-
-func (self *Server) ClientIdentity() ClientIdentity {
- return self.identity
-}
-
-func (self *Server) PeersMessage() (msg *Msg, err error) {
- // TODO: memoize and reset when peers change
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- msg = self.peersMsg
- if msg == nil {
- var peerData []interface{}
- for _, i := range self.peersTable {
- peer := self.peers[i]
- peerData = append(peerData, peer.Encode())
- }
- if len(peerData) == 0 {
- err = fmt.Errorf("no peers")
- } else {
- msg, err = NewMsg(PeersMsg, peerData...)
- self.peersMsg = msg //memoize
- }
- }
- return
-}
-
-func (self *Server) Peers() (peers []*Peer) {
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- for _, peer := range self.peers {
- if peer != nil {
- peers = append(peers, peer)
- }
- }
- return
-}
-
-func (self *Server) PeerCount() int {
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- return self.peerCount
-}
-
-var getPeersMsg, _ = NewMsg(GetPeersMsg)
-
-func (self *Server) PeerConnect(addr net.Addr) {
- // TODO: should buffer, filter and uniq
- // send GetPeersMsg if not blocking
- select {
- case self.peerConnect <- addr: // not enough peers
- self.Broadcast("", getPeersMsg)
- default: // we dont care
- }
-}
-
-func (self *Server) PeerDisconnect() chan DisconnectRequest {
- return self.peerDisconnect
-}
-
-func (self *Server) Blacklist() Blacklist {
- return self.blacklist
-}
-
-func (self *Server) Handlers() Handlers {
- return self.handlers
-}
-
-func (self *Server) Broadcast(protocol string, msg *Msg) {
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- for _, peer := range self.peers {
- if peer != nil {
- peer.Write(protocol, msg)
- }
- }
-}
-
-// Start the server
-func (self *Server) Start(listen bool, dial bool) {
- self.network.Start()
- if listen {
- listener, err := self.network.Listener(self.addr)
- if err != nil {
- logger.Warnf("Error initializing listener: %v", err)
- logger.Warnf("Connection listening disabled")
- self.listening = false
- } else {
- self.listening = true
- logger.Infoln("Listen on %v: ready and accepting connections", listener.Addr())
- go self.inboundPeerHandler(listener)
- }
- }
- if dial {
- dialer, err := self.network.Dialer(self.addr)
- if err != nil {
- logger.Warnf("Error initializing dialer: %v", err)
- logger.Warnf("Connection dialout disabled")
- self.dialing = false
- } else {
- self.dialing = true
- logger.Infoln("Dial peers watching outbound address pool")
- go self.outboundPeerHandler(dialer)
- }
- }
- logger.Infoln("server started")
-}
-
-func (self *Server) Stop() {
- logger.Infoln("server stopping...")
- // // quit one loop if dialing
- if self.dialing {
- logger.Infoln("stop dialout...")
- dialq := make(chan bool)
- self.quit <- dialq
- <-dialq
- fmt.Println("quit another")
- }
- // quit the other loop if listening
- if self.listening {
- logger.Infoln("stop listening...")
- listenq := make(chan bool)
- self.quit <- listenq
- <-listenq
- fmt.Println("quit one")
- }
-
- fmt.Println("quit waited")
-
- logger.Infoln("stopping peers...")
- peers := []net.Addr{}
- self.peersLock.RLock()
- self.closed = true
- for _, peer := range self.peers {
- if peer != nil {
- peers = append(peers, peer.Address)
- }
- }
- self.peersLock.RUnlock()
- for _, address := range peers {
- go self.removePeer(DisconnectRequest{
- addr: address,
- reason: DiscQuitting,
- })
- }
- // wait till they actually disconnect
- // this is checked by draining the peerSlots (slots are released back if a peer is removed)
- i := 0
- fmt.Println("draining peers")
-
-FOR:
- for {
- select {
- case slot := <-self.peerSlots:
- i++
- fmt.Printf("%v: found slot %v", i, slot)
- if i == self.maxPeers {
- break FOR
- }
- }
- }
- logger.Infoln("server stopped")
-}
-
-// main loop for adding connections via listening
-func (self *Server) inboundPeerHandler(listener net.Listener) {
- for {
- select {
- case slot := <-self.peerSlots:
- go self.connectInboundPeer(listener, slot)
- case errc := <-self.quit:
- listener.Close()
- fmt.Println("quit listenloop")
- errc <- true
- return
- }
- }
-}
-
-// main loop for adding outbound peers based on peerConnect address pool
-// this same loop handles peer disconnect requests as well
-func (self *Server) outboundPeerHandler(dialer Dialer) {
- // addressChan initially set to nil (only watches peerConnect if we need more peers)
- var addressChan chan net.Addr
- slots := self.peerSlots
- var slot *int
- for {
- select {
- case i := <-slots:
- // we need a peer in slot i, slot reserved
- slot = &i
- // now we can watch for candidate peers in the next loop
- addressChan = self.peerConnect
- // do not consume more until candidate peer is found
- slots = nil
- case address := <-addressChan:
- // candidate peer found, will dial out asyncronously
- // if connection fails slot will be released
- go self.connectOutboundPeer(dialer, address, *slot)
- // we can watch if more peers needed in the next loop
- slots = self.peerSlots
- // until then we dont care about candidate peers
- addressChan = nil
- case request := <-self.peerDisconnect:
- go self.removePeer(request)
- case errc := <-self.quit:
- if addressChan != nil && slot != nil {
- self.peerSlots <- *slot
- }
- fmt.Println("quit dialloop")
- errc <- true
- return
- }
- }
-}
-
-// check if peer address already connected
-func (self *Server) connected(address net.Addr) (err error) {
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- // fmt.Printf("address: %v\n", address)
- slot, found := self.peersTable[address.String()]
- if found {
- err = fmt.Errorf("already connected as peer %v (%v)", slot, address)
- }
- return
-}
-
-// connect to peer via listener.Accept()
-func (self *Server) connectInboundPeer(listener net.Listener, slot int) {
- var address net.Addr
- conn, err := listener.Accept()
- if err == nil {
- address = conn.RemoteAddr()
- err = self.connected(address)
- if err != nil {
- conn.Close()
- }
- }
- if err != nil {
- logger.Debugln(err)
- self.peerSlots <- slot
- } else {
- fmt.Printf("adding %v\n", address)
- go self.addPeer(conn, address, true, slot)
- }
-}
-
-// connect to peer via dial out
-func (self *Server) connectOutboundPeer(dialer Dialer, address net.Addr, slot int) {
- var conn net.Conn
- err := self.connected(address)
- if err == nil {
- conn, err = dialer.Dial(address.Network(), address.String())
- }
- if err != nil {
- logger.Debugln(err)
- self.peerSlots <- slot
- } else {
- go self.addPeer(conn, address, false, slot)
- }
-}
-
-// creates the new peer object and inserts it into its slot
-func (self *Server) addPeer(conn net.Conn, address net.Addr, inbound bool, slot int) {
- self.peersLock.Lock()
- defer self.peersLock.Unlock()
- if self.closed {
- fmt.Println("oopsy, not no longer need peer")
- conn.Close() //oopsy our bad
- self.peerSlots <- slot // release slot
- } else {
- peer := NewPeer(conn, address, inbound, self)
- self.peers[slot] = peer
- self.peersTable[address.String()] = slot
- self.peerCount++
- // reset peersmsg
- self.peersMsg = nil
- fmt.Printf("added peer %v %v (slot %v)\n", address, peer, slot)
- peer.Start()
- }
-}
-
-// removes peer: sending disconnect msg, stop peer, remove rom list/table, release slot
-func (self *Server) removePeer(request DisconnectRequest) {
- self.peersLock.Lock()
-
- address := request.addr
- slot := self.peersTable[address.String()]
- peer := self.peers[slot]
- fmt.Printf("removing peer %v %v (slot %v)\n", address, peer, slot)
- if peer == nil {
- logger.Debugf("already removed peer on %v", address)
- self.peersLock.Unlock()
- return
- }
- // remove from list and index
- self.peerCount--
- self.peers[slot] = nil
- delete(self.peersTable, address.String())
- // reset peersmsg
- self.peersMsg = nil
- fmt.Printf("removed peer %v (slot %v)\n", peer, slot)
- self.peersLock.Unlock()
-
- // sending disconnect message
- disconnectMsg, _ := NewMsg(DiscMsg, request.reason)
- peer.Write("", disconnectMsg)
- // be nice and wait
- time.Sleep(disconnectGracePeriod * time.Second)
- // switch off peer and close connections etc.
- fmt.Println("stopping peer")
- peer.Stop()
- fmt.Println("stopped peer")
- // release slot to signal need for a new peer, last!
- self.peerSlots <- slot
-}
-
-// fix handshake message to push to peers
-func (self *Server) Handshake() *Msg {
- fmt.Println(self.identity.Pubkey()[1:])
- msg, _ := NewMsg(HandshakeMsg, P2PVersion, []byte(self.identity.String()), []interface{}{self.protocols}, self.port, self.identity.Pubkey()[1:])
- return msg
-}
-
-func (self *Server) RegisterPubkey(candidate *Peer, pubkey []byte) error {
- // Check for blacklisting
- if self.blacklist.Exists(pubkey) {
- return fmt.Errorf("blacklisted")
- }
-
- self.peersLock.RLock()
- defer self.peersLock.RUnlock()
- for _, peer := range self.peers {
- if peer != nil && peer != candidate && bytes.Compare(peer.Pubkey, pubkey) == 0 {
- return fmt.Errorf("already connected")
- }
- }
- candidate.Pubkey = pubkey
- return nil
-}
diff --git a/p2p/server_test.go b/p2p/server_test.go
index f749cc490..5c0d08d39 100644
--- a/p2p/server_test.go
+++ b/p2p/server_test.go
@@ -2,207 +2,160 @@ package p2p
import (
"bytes"
- "fmt"
+ "io"
"net"
+ "sync"
"testing"
"time"
)
-type TestNetwork struct {
- connections map[string]*TestNetworkConnection
- dialer Dialer
- maxinbound int
-}
-
-func NewTestNetwork(maxinbound int) *TestNetwork {
- connections := make(map[string]*TestNetworkConnection)
- return &TestNetwork{
- connections: connections,
- dialer: &TestDialer{connections},
- maxinbound: maxinbound,
+func startTestServer(t *testing.T, pf peerFunc) *Server {
+ server := &Server{
+ Identity: NewSimpleClientIdentity("clientIdentifier", "version", "customIdentifier", "pubkey"),
+ MaxPeers: 10,
+ ListenAddr: "127.0.0.1:0",
+ newPeerFunc: pf,
}
-}
-
-func (self *TestNetwork) Dialer(addr net.Addr) (Dialer, error) {
- return self.dialer, nil
-}
-
-func (self *TestNetwork) Listener(addr net.Addr) (net.Listener, error) {
- return &TestListener{
- connections: self.connections,
- addr: addr,
- max: self.maxinbound,
- }, nil
-}
-
-func (self *TestNetwork) Start() error {
- return nil
-}
-
-func (self *TestNetwork) NewAddr(string, int) (addr net.Addr, err error) {
- return
-}
-
-func (self *TestNetwork) ParseAddr(string) (addr net.Addr, err error) {
- return
-}
-
-type TestAddr struct {
- name string
-}
-
-func (self *TestAddr) String() string {
- return self.name
-}
-
-func (*TestAddr) Network() string {
- return "test"
-}
-
-type TestDialer struct {
- connections map[string]*TestNetworkConnection
-}
-
-func (self *TestDialer) Dial(network string, addr string) (conn net.Conn, err error) {
- address := &TestAddr{addr}
- tconn := NewTestNetworkConnection(address)
- self.connections[addr] = tconn
- conn = net.Conn(tconn)
- return
-}
-
-type TestListener struct {
- connections map[string]*TestNetworkConnection
- addr net.Addr
- max int
- i int
-}
-
-func (self *TestListener) Accept() (conn net.Conn, err error) {
- self.i++
- if self.i > self.max {
- err = fmt.Errorf("no more")
- } else {
- addr := &TestAddr{fmt.Sprintf("inboundpeer-%d", self.i)}
- tconn := NewTestNetworkConnection(addr)
- key := tconn.RemoteAddr().String()
- self.connections[key] = tconn
- conn = net.Conn(tconn)
- fmt.Printf("accepted connection from: %v \n", addr)
+ if err := server.Start(); err != nil {
+ t.Fatalf("Could not start server: %v", err)
}
- return
+ return server
}
-func (self *TestListener) Close() error {
- return nil
-}
+func TestServerListen(t *testing.T) {
+ defer testlog(t).detach()
-func (self *TestListener) Addr() net.Addr {
- return self.addr
-}
-
-func SetupTestServer(handlers Handlers) (network *TestNetwork, server *Server) {
- network = NewTestNetwork(1)
- addr := &TestAddr{"test:30303"}
- identity := NewSimpleClientIdentity("clientIdentifier", "version", "customIdentifier", "pubkey")
- maxPeers := 2
- if handlers == nil {
- handlers = make(Handlers)
- }
- blackist := NewBlacklist()
- server = New(network, addr, identity, handlers, maxPeers, blackist)
- fmt.Println(server.identity.Pubkey())
- return
-}
-
-func TestServerListener(t *testing.T) {
- network, server := SetupTestServer(nil)
- server.Start(true, false)
- time.Sleep(10 * time.Millisecond)
- server.Stop()
- peer1, ok := network.connections["inboundpeer-1"]
- if !ok {
- t.Error("not found inbound peer 1")
- } else {
- fmt.Printf("out: %v\n", peer1.Out)
- if len(peer1.Out) != 2 {
- t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out))
+ // start the test server
+ connected := make(chan *Peer)
+ srv := startTestServer(t, func(srv *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
+ if conn == nil {
+ t.Error("peer func called with nil conn")
}
- }
+ if dialAddr != nil {
+ t.Error("peer func called with non-nil dialAddr")
+ }
+ peer := newPeer(conn, nil, dialAddr)
+ connected <- peer
+ return peer
+ })
+ defer close(connected)
+ defer srv.Stop()
+ // dial the test server
+ conn, err := net.DialTimeout("tcp", srv.ListenAddr, 5*time.Second)
+ if err != nil {
+ t.Fatalf("could not dial: %v", err)
+ }
+ defer conn.Close()
+
+ select {
+ case peer := <-connected:
+ if peer.conn.LocalAddr().String() != conn.RemoteAddr().String() {
+ t.Errorf("peer started with wrong conn: got %v, want %v",
+ peer.conn.LocalAddr(), conn.RemoteAddr())
+ }
+ case <-time.After(1 * time.Second):
+ t.Error("server did not accept within one second")
+ }
}
-func TestServerDialer(t *testing.T) {
- network, server := SetupTestServer(nil)
- server.Start(false, true)
- server.peerConnect <- &TestAddr{"outboundpeer-1"}
- time.Sleep(10 * time.Millisecond)
- server.Stop()
- peer1, ok := network.connections["outboundpeer-1"]
- if !ok {
- t.Error("not found outbound peer 1")
- } else {
- fmt.Printf("out: %v\n", peer1.Out)
- if len(peer1.Out) != 2 {
- t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out))
+func TestServerDial(t *testing.T) {
+ defer testlog(t).detach()
+
+ // run a fake TCP server to handle the connection.
+ listener, err := net.Listen("tcp", "127.0.0.1:0")
+ if err != nil {
+ t.Fatalf("could not setup listener: %v")
+ }
+ defer listener.Close()
+ accepted := make(chan net.Conn)
+ go func() {
+ conn, err := listener.Accept()
+ if err != nil {
+ t.Error("acccept error:", err)
}
+ conn.Close()
+ accepted <- conn
+ }()
+
+ // start the test server
+ connected := make(chan *Peer)
+ srv := startTestServer(t, func(srv *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
+ if conn == nil {
+ t.Error("peer func called with nil conn")
+ }
+ peer := newPeer(conn, nil, dialAddr)
+ connected <- peer
+ return peer
+ })
+ defer close(connected)
+ defer srv.Stop()
+
+ // tell the server to connect.
+ connAddr := newPeerAddr(listener.Addr(), nil)
+ srv.peerConnect <- connAddr
+
+ select {
+ case conn := <-accepted:
+ select {
+ case peer := <-connected:
+ if peer.conn.RemoteAddr().String() != conn.LocalAddr().String() {
+ t.Errorf("peer started with wrong conn: got %v, want %v",
+ peer.conn.RemoteAddr(), conn.LocalAddr())
+ }
+ if peer.dialAddr != connAddr {
+ t.Errorf("peer started with wrong dialAddr: got %v, want %v",
+ peer.dialAddr, connAddr)
+ }
+ case <-time.After(1 * time.Second):
+ t.Error("server did not launch peer within one second")
+ }
+
+ case <-time.After(1 * time.Second):
+ t.Error("server did not connect within one second")
}
}
func TestServerBroadcast(t *testing.T) {
- handlers := make(Handlers)
- testProtocol := &TestProtocol{Msgs: []*Msg{}}
- handlers["aaa"] = func(p *Peer) Protocol { return testProtocol }
- network, server := SetupTestServer(handlers)
- server.Start(true, true)
- server.peerConnect <- &TestAddr{"outboundpeer-1"}
- time.Sleep(10 * time.Millisecond)
- msg, _ := NewMsg(0)
- server.Broadcast("", msg)
- packet := Packet(0, 0)
- time.Sleep(10 * time.Millisecond)
- server.Stop()
- peer1, ok := network.connections["outboundpeer-1"]
- if !ok {
- t.Error("not found outbound peer 1")
- } else {
- fmt.Printf("out: %v\n", peer1.Out)
- if len(peer1.Out) != 3 {
- t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out))
- } else {
- if bytes.Compare(peer1.Out[1], packet) != 0 {
- t.Errorf("incorrect broadcast packet %v != %v", peer1.Out[1], packet)
- }
- }
- }
- peer2, ok := network.connections["inboundpeer-1"]
- if !ok {
- t.Error("not found inbound peer 2")
- } else {
- fmt.Printf("out: %v\n", peer2.Out)
- if len(peer1.Out) != 3 {
- t.Errorf("not enough messages sent to peer 2: %v ", len(peer2.Out))
- } else {
- if bytes.Compare(peer2.Out[1], packet) != 0 {
- t.Errorf("incorrect broadcast packet %v != %v", peer2.Out[1], packet)
- }
- }
- }
-}
+ defer testlog(t).detach()
+ var connected sync.WaitGroup
+ srv := startTestServer(t, func(srv *Server, c net.Conn, dialAddr *peerAddr) *Peer {
+ peer := newPeer(c, []Protocol{discard}, dialAddr)
+ peer.startSubprotocols([]Cap{discard.cap()})
+ connected.Done()
+ return peer
+ })
+ defer srv.Stop()
-func TestServerPeersMessage(t *testing.T) {
- handlers := make(Handlers)
- _, server := SetupTestServer(handlers)
- server.Start(true, true)
- defer server.Stop()
- server.peerConnect <- &TestAddr{"outboundpeer-1"}
- time.Sleep(10 * time.Millisecond)
- peersMsg, err := server.PeersMessage()
- fmt.Println(peersMsg)
- if err != nil {
- t.Errorf("expect no error, got %v", err)
+ // dial a bunch of conns
+ var conns = make([]net.Conn, 8)
+ connected.Add(len(conns))
+ deadline := time.Now().Add(3 * time.Second)
+ dialer := &net.Dialer{Deadline: deadline}
+ for i := range conns {
+ conn, err := dialer.Dial("tcp", srv.ListenAddr)
+ if err != nil {
+ t.Fatalf("conn %d: dial error: %v", i, err)
+ }
+ defer conn.Close()
+ conn.SetDeadline(deadline)
+ conns[i] = conn
}
- if c := server.PeerCount(); c != 2 {
- t.Errorf("expect 2 peers, got %v", c)
+ connected.Wait()
+
+ // broadcast one message
+ srv.Broadcast("discard", 0, "foo")
+ goldbuf := new(bytes.Buffer)
+ writeMsg(goldbuf, NewMsg(16, "foo"))
+ golden := goldbuf.Bytes()
+
+ // check that the message has been written everywhere
+ for i, conn := range conns {
+ buf := make([]byte, len(golden))
+ if _, err := io.ReadFull(conn, buf); err != nil {
+ t.Errorf("conn %d: read error: %v", i, err)
+ } else if !bytes.Equal(buf, golden) {
+ t.Errorf("conn %d: msg mismatch\ngot: %x\nwant: %x", i, buf, golden)
+ }
}
}
diff --git a/p2p/testlog_test.go b/p2p/testlog_test.go
new file mode 100644
index 000000000..951d43243
--- /dev/null
+++ b/p2p/testlog_test.go
@@ -0,0 +1,28 @@
+package p2p
+
+import (
+ "testing"
+
+ "github.com/ethereum/go-ethereum/logger"
+)
+
+type testLogger struct{ t *testing.T }
+
+func testlog(t *testing.T) testLogger {
+ logger.Reset()
+ l := testLogger{t}
+ logger.AddLogSystem(l)
+ return l
+}
+
+func (testLogger) GetLogLevel() logger.LogLevel { return logger.DebugLevel }
+func (testLogger) SetLogLevel(logger.LogLevel) {}
+
+func (l testLogger) LogPrint(level logger.LogLevel, msg string) {
+ l.t.Logf("%s", msg)
+}
+
+func (testLogger) detach() {
+ logger.Flush()
+ logger.Reset()
+}
diff --git a/p2p/testpoc7.go b/p2p/testpoc7.go
new file mode 100644
index 000000000..c0cc5c544
--- /dev/null
+++ b/p2p/testpoc7.go
@@ -0,0 +1,40 @@
+// +build none
+
+package main
+
+import (
+ "fmt"
+ "log"
+ "net"
+ "os"
+
+ "github.com/ethereum/go-ethereum/logger"
+ "github.com/ethereum/go-ethereum/p2p"
+ "github.com/obscuren/secp256k1-go"
+)
+
+func main() {
+ logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.DebugLevel))
+
+ pub, _ := secp256k1.GenerateKeyPair()
+ srv := p2p.Server{
+ MaxPeers: 10,
+ Identity: p2p.NewSimpleClientIdentity("test", "1.0", "", string(pub)),
+ ListenAddr: ":30303",
+ NAT: p2p.PMP(net.ParseIP("10.0.0.1")),
+ }
+ if err := srv.Start(); err != nil {
+ fmt.Println("could not start server:", err)
+ os.Exit(1)
+ }
+
+ // add seed peers
+ seed, err := net.ResolveTCPAddr("tcp", "poc-7.ethdev.com:30303")
+ if err != nil {
+ fmt.Println("couldn't resolve:", err)
+ os.Exit(1)
+ }
+ srv.SuggestPeer(seed.IP, seed.Port, nil)
+
+ select {}
+}
diff --git a/rlp/decode.go b/rlp/decode.go
index 96d912f56..7d95af02b 100644
--- a/rlp/decode.go
+++ b/rlp/decode.go
@@ -1,6 +1,7 @@
package rlp
import (
+ "bufio"
"encoding/binary"
"errors"
"fmt"
@@ -24,8 +25,9 @@ type Decoder interface {
DecodeRLP(*Stream) error
}
-// Decode parses RLP-encoded data from r and stores the result
-// in the value pointed to by val. Val must be a non-nil pointer.
+// Decode parses RLP-encoded data from r and stores the result in the
+// value pointed to by val. Val must be a non-nil pointer. If r does
+// not implement ByteReader, Decode will do its own buffering.
//
// Decode uses the following type-dependent decoding rules:
//
@@ -66,10 +68,19 @@ type Decoder interface {
//
// Non-empty interface types are not supported, nor are bool, float32,
// float64, maps, channel types and functions.
-func Decode(r ByteReader, val interface{}) error {
+func Decode(r io.Reader, val interface{}) error {
return NewStream(r).Decode(val)
}
+type decodeError struct {
+ msg string
+ typ reflect.Type
+}
+
+func (err decodeError) Error() string {
+ return fmt.Sprintf("rlp: %s for %v", err.msg, err.typ)
+}
+
func makeNumDecoder(typ reflect.Type) decoder {
kind := typ.Kind()
switch {
@@ -83,8 +94,11 @@ func makeNumDecoder(typ reflect.Type) decoder {
}
func decodeInt(s *Stream, val reflect.Value) error {
- num, err := s.uint(val.Type().Bits())
- if err != nil {
+ typ := val.Type()
+ num, err := s.uint(typ.Bits())
+ if err == errUintOverflow {
+ return decodeError{"input string too long", typ}
+ } else if err != nil {
return err
}
val.SetInt(int64(num))
@@ -92,8 +106,11 @@ func decodeInt(s *Stream, val reflect.Value) error {
}
func decodeUint(s *Stream, val reflect.Value) error {
- num, err := s.uint(val.Type().Bits())
- if err != nil {
+ typ := val.Type()
+ num, err := s.uint(typ.Bits())
+ if err == errUintOverflow {
+ return decodeError{"input string too big", typ}
+ } else if err != nil {
return err
}
val.SetUint(num)
@@ -175,7 +192,7 @@ func decodeList(s *Stream, val reflect.Value, elemdec decoder, maxelem int) erro
i := 0
for {
if i > maxelem {
- return fmt.Errorf("rlp: input List has more than %d elements", maxelem)
+ return decodeError{"input list has too many elements", val.Type()}
}
if val.Kind() == reflect.Slice {
// grow slice if necessary
@@ -226,8 +243,6 @@ func decodeByteSlice(s *Stream, val reflect.Value) error {
return err
}
-var errStringDoesntFitArray = errors.New("rlp: string value doesn't fit into target array")
-
func decodeByteArray(s *Stream, val reflect.Value) error {
kind, size, err := s.Kind()
if err != nil {
@@ -236,14 +251,14 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
switch kind {
case Byte:
if val.Len() == 0 {
- return errStringDoesntFitArray
+ return decodeError{"input string too big", val.Type()}
}
bv, _ := s.Uint()
val.Index(0).SetUint(bv)
zero(val, 1)
case String:
if uint64(val.Len()) < size {
- return errStringDoesntFitArray
+ return decodeError{"input string too big", val.Type()}
}
slice := val.Slice(0, int(size)).Interface().([]byte)
if err := s.readFull(slice); err != nil {
@@ -293,7 +308,7 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
}
}
if err = s.ListEnd(); err == errNotAtEOL {
- err = errors.New("rlp: input List has too many elements")
+ err = decodeError{"input list has too many elements", typ}
}
return err
}
@@ -432,8 +447,23 @@ type Stream struct {
type listpos struct{ pos, size uint64 }
-func NewStream(r ByteReader) *Stream {
- return &Stream{r: r, uintbuf: make([]byte, 8), kind: -1}
+// NewStream creates a new stream reading from r.
+// If r does not implement ByteReader, the Stream will
+// introduce its own buffering.
+func NewStream(r io.Reader) *Stream {
+ s := new(Stream)
+ s.Reset(r)
+ return s
+}
+
+// NewListStream creates a new stream that pretends to be positioned
+// at an encoded list of the given length.
+func NewListStream(r io.Reader, len uint64) *Stream {
+ s := new(Stream)
+ s.Reset(r)
+ s.kind = List
+ s.size = len
+ return s
}
// Bytes reads an RLP string and returns its contents as a byte slice.
@@ -459,6 +489,8 @@ func (s *Stream) Bytes() ([]byte, error) {
}
}
+var errUintOverflow = errors.New("rlp: uint overflow")
+
// Uint reads an RLP string of up to 8 bytes and returns its contents
// as an unsigned integer. If the input does not contain an RLP string, the
// returned error will be ErrExpectedString.
@@ -477,7 +509,7 @@ func (s *Stream) uint(maxbits int) (uint64, error) {
return uint64(s.byteval), nil
case String:
if size > uint64(maxbits/8) {
- return 0, fmt.Errorf("rlp: string is larger than %d bits", maxbits)
+ return 0, errUintOverflow
}
return s.readUint(byte(size))
default:
@@ -543,6 +575,23 @@ func (s *Stream) Decode(val interface{}) error {
return info.decoder(s, rval.Elem())
}
+// Reset discards any information about the current decoding context
+// and starts reading from r. If r does not also implement ByteReader,
+// Stream will do its own buffering.
+func (s *Stream) Reset(r io.Reader) {
+ bufr, ok := r.(ByteReader)
+ if !ok {
+ bufr = bufio.NewReader(r)
+ }
+ s.r = bufr
+ s.stack = s.stack[:0]
+ s.size = 0
+ s.kind = -1
+ if s.uintbuf == nil {
+ s.uintbuf = make([]byte, 8)
+ }
+}
+
// Kind returns the kind and size of the next value in the
// input stream.
//
diff --git a/rlp/decode_test.go b/rlp/decode_test.go
index eb1618299..3b60234dd 100644
--- a/rlp/decode_test.go
+++ b/rlp/decode_test.go
@@ -3,7 +3,6 @@ package rlp
import (
"bytes"
"encoding/hex"
- "errors"
"fmt"
"io"
"math/big"
@@ -54,6 +53,24 @@ func TestStreamKind(t *testing.T) {
}
}
+func TestNewListStream(t *testing.T) {
+ ls := NewListStream(bytes.NewReader(unhex("0101010101")), 3)
+ if k, size, err := ls.Kind(); k != List || size != 3 || err != nil {
+ t.Errorf("Kind() returned (%v, %d, %v), expected (List, 3, nil)", k, size, err)
+ }
+ if size, err := ls.List(); size != 3 || err != nil {
+ t.Errorf("List() returned (%d, %v), expected (3, nil)", size, err)
+ }
+ for i := 0; i < 3; i++ {
+ if val, err := ls.Uint(); val != 1 || err != nil {
+ t.Errorf("Uint() returned (%d, %v), expected (1, nil)", val, err)
+ }
+ }
+ if err := ls.ListEnd(); err != nil {
+ t.Errorf("ListEnd() returned %v, expected (3, nil)", err)
+ }
+}
+
func TestStreamErrors(t *testing.T) {
type calls []string
tests := []struct {
@@ -69,7 +86,7 @@ func TestStreamErrors(t *testing.T) {
{"81", calls{"Bytes"}, io.ErrUnexpectedEOF},
{"81", calls{"Uint"}, io.ErrUnexpectedEOF},
{"BFFFFFFFFFFFFFFF", calls{"Bytes"}, io.ErrUnexpectedEOF},
- {"89000000000000000001", calls{"Uint"}, errors.New("rlp: string is larger than 64 bits")},
+ {"89000000000000000001", calls{"Uint"}, errUintOverflow},
{"00", calls{"List"}, ErrExpectedList},
{"80", calls{"List"}, ErrExpectedList},
{"C0", calls{"List", "Uint"}, EOL},
@@ -163,7 +180,7 @@ type decodeTest struct {
input string
ptr interface{}
value interface{}
- error error
+ error string
}
type simplestruct struct {
@@ -196,8 +213,8 @@ var decodeTests = []decodeTest{
{input: "820505", ptr: new(uint32), value: uint32(0x0505)},
{input: "83050505", ptr: new(uint32), value: uint32(0x050505)},
{input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)},
- {input: "850505050505", ptr: new(uint32), error: errors.New("rlp: string is larger than 32 bits")},
- {input: "C0", ptr: new(uint32), error: ErrExpectedString},
+ {input: "850505050505", ptr: new(uint32), error: "rlp: input string too big for uint32"},
+ {input: "C0", ptr: new(uint32), error: ErrExpectedString.Error()},
// slices
{input: "C0", ptr: new([]int), value: []int{}},
@@ -206,7 +223,7 @@ var decodeTests = []decodeTest{
// arrays
{input: "C0", ptr: new([5]int), value: [5]int{}},
{input: "C50102030405", ptr: new([5]int), value: [5]int{1, 2, 3, 4, 5}},
- {input: "C6010203040506", ptr: new([5]int), error: errors.New("rlp: input List has more than 5 elements")},
+ {input: "C6010203040506", ptr: new([5]int), error: "rlp: input list has too many elements for [5]int"},
// byte slices
{input: "01", ptr: new([]byte), value: []byte{1}},
@@ -214,7 +231,7 @@ var decodeTests = []decodeTest{
{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
{input: "C0", ptr: new([]byte), value: []byte{}},
{input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}},
- {input: "C3820102", ptr: new([]byte), error: errors.New("rlp: string is larger than 8 bits")},
+ {input: "C3820102", ptr: new([]byte), error: "rlp: input string too big for uint8"},
// byte arrays
{input: "01", ptr: new([5]byte), value: [5]byte{1}},
@@ -222,9 +239,9 @@ var decodeTests = []decodeTest{
{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
{input: "C0", ptr: new([5]byte), value: [5]byte{}},
{input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}},
- {input: "C3820102", ptr: new([5]byte), error: errors.New("rlp: string is larger than 8 bits")},
- {input: "86010203040506", ptr: new([5]byte), error: errStringDoesntFitArray},
- {input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF},
+ {input: "C3820102", ptr: new([5]byte), error: "rlp: input string too big for uint8"},
+ {input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too big for [5]uint8"},
+ {input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF.Error()},
// byte array reuse (should be zeroed)
{input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}},
@@ -237,25 +254,25 @@ var decodeTests = []decodeTest{
// zero sized byte arrays
{input: "80", ptr: new([0]byte), value: [0]byte{}},
{input: "C0", ptr: new([0]byte), value: [0]byte{}},
- {input: "01", ptr: new([0]byte), error: errStringDoesntFitArray},
- {input: "8101", ptr: new([0]byte), error: errStringDoesntFitArray},
+ {input: "01", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
+ {input: "8101", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
// strings
{input: "00", ptr: new(string), value: "\000"},
{input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"},
- {input: "C0", ptr: new(string), error: ErrExpectedString},
+ {input: "C0", ptr: new(string), error: ErrExpectedString.Error()},
// big ints
{input: "01", ptr: new(*big.Int), value: big.NewInt(1)},
{input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt},
{input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works
- {input: "C0", ptr: new(*big.Int), error: ErrExpectedString},
+ {input: "C0", ptr: new(*big.Int), error: ErrExpectedString.Error()},
// structs
{input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}},
{input: "C105", ptr: new(simplestruct), value: simplestruct{5, ""}},
{input: "C50583343434", ptr: new(simplestruct), value: simplestruct{5, "444"}},
- {input: "C3010101", ptr: new(simplestruct), error: errors.New("rlp: input List has too many elements")},
+ {input: "C3010101", ptr: new(simplestruct), error: "rlp: input list has too many elements for rlp.simplestruct"},
{
input: "C501C302C103",
ptr: new(recstruct),
@@ -286,20 +303,20 @@ var decodeTests = []decodeTest{
func intp(i int) *int { return &i }
-func TestDecode(t *testing.T) {
+func runTests(t *testing.T, decode func([]byte, interface{}) error) {
for i, test := range decodeTests {
input, err := hex.DecodeString(test.input)
if err != nil {
t.Errorf("test %d: invalid hex input %q", i, test.input)
continue
}
- err = Decode(bytes.NewReader(input), test.ptr)
- if err != nil && test.error == nil {
+ err = decode(input, test.ptr)
+ if err != nil && test.error == "" {
t.Errorf("test %d: unexpected Decode error: %v\ndecoding into %T\ninput %q",
i, err, test.ptr, test.input)
continue
}
- if test.error != nil && fmt.Sprint(err) != fmt.Sprint(test.error) {
+ if test.error != "" && fmt.Sprint(err) != test.error {
t.Errorf("test %d: Decode error mismatch\ngot %v\nwant %v\ndecoding into %T\ninput %q",
i, err, test.error, test.ptr, test.input)
continue
@@ -312,6 +329,40 @@ func TestDecode(t *testing.T) {
}
}
+func TestDecodeWithByteReader(t *testing.T) {
+ runTests(t, func(input []byte, into interface{}) error {
+ return Decode(bytes.NewReader(input), into)
+ })
+}
+
+// dumbReader reads from a byte slice but does not
+// implement ReadByte.
+type dumbReader []byte
+
+func (r *dumbReader) Read(buf []byte) (n int, err error) {
+ if len(*r) == 0 {
+ return 0, io.EOF
+ }
+ n = copy(buf, *r)
+ *r = (*r)[n:]
+ return n, nil
+}
+
+func TestDecodeWithNonByteReader(t *testing.T) {
+ runTests(t, func(input []byte, into interface{}) error {
+ r := dumbReader(input)
+ return Decode(&r, into)
+ })
+}
+
+func TestDecodeStreamReset(t *testing.T) {
+ s := NewStream(nil)
+ runTests(t, func(input []byte, into interface{}) error {
+ s.Reset(bytes.NewReader(input))
+ return s.Decode(into)
+ })
+}
+
type testDecoder struct{ called bool }
func (t *testDecoder) DecodeRLP(s *Stream) error {