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package mempool
import (
"bytes"
"fmt"
"sync/atomic"
"github.com/tendermint/tendermint/binary"
"github.com/tendermint/tendermint/p2p"
"github.com/tendermint/tendermint/types"
)
var (
MempoolChannel = byte(0x30)
)
// MempoolReactor handles mempool tx broadcasting amongst peers.
type MempoolReactor struct {
sw *p2p.Switch
quit chan struct{}
started uint32
stopped uint32
Mempool *Mempool
}
func NewMempoolReactor(mempool *Mempool) *MempoolReactor {
memR := &MempoolReactor{
quit: make(chan struct{}),
Mempool: mempool,
}
return memR
}
// Implements Reactor
func (memR *MempoolReactor) Start(sw *p2p.Switch) {
if atomic.CompareAndSwapUint32(&memR.started, 0, 1) {
memR.sw = sw
log.Info("Starting MempoolReactor")
}
}
// Implements Reactor
func (memR *MempoolReactor) Stop() {
if atomic.CompareAndSwapUint32(&memR.stopped, 0, 1) {
log.Info("Stopping MempoolReactor")
close(memR.quit)
}
}
// Implements Reactor
func (memR *MempoolReactor) GetChannels() []*p2p.ChannelDescriptor {
return []*p2p.ChannelDescriptor{
&p2p.ChannelDescriptor{
Id: MempoolChannel,
Priority: 5,
},
}
}
// Implements Reactor
func (pexR *MempoolReactor) AddPeer(peer *p2p.Peer) {
}
// Implements Reactor
func (pexR *MempoolReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
}
// Implements Reactor
func (memR *MempoolReactor) Receive(chId byte, src *p2p.Peer, msgBytes []byte) {
_, msg_, err := DecodeMessage(msgBytes)
if err != nil {
log.Warn("Error decoding message", "error", err)
return
}
log.Info("MempoolReactor received message", "msg", msg_)
switch msg := msg_.(type) {
case *TxMessage:
err := memR.Mempool.AddTx(msg.Tx)
if err != nil {
// Bad, seen, or conflicting tx.
log.Debug("Could not add tx", "tx", msg.Tx)
return
} else {
log.Debug("Added valid tx", "tx", msg.Tx)
}
// Share tx.
// We use a simple shotgun approach for now.
// TODO: improve efficiency
for _, peer := range memR.sw.Peers().List() {
if peer.Key == src.Key {
continue
}
peer.TrySend(MempoolChannel, msg)
}
default:
// Ignore unknown message
}
}
func (memR *MempoolReactor) BroadcastTx(tx types.Tx) error {
err := memR.Mempool.AddTx(tx)
if err != nil {
return err
}
msg := &TxMessage{Tx: tx}
memR.sw.Broadcast(MempoolChannel, msg)
return nil
}
//-----------------------------------------------------------------------------
// Messages
const (
msgTypeUnknown = byte(0x00)
msgTypeTx = byte(0x10)
)
// TODO: check for unnecessary extra bytes at the end.
func DecodeMessage(bz []byte) (msgType byte, msg interface{}, err error) {
n := new(int64)
msgType = bz[0]
r := bytes.NewReader(bz)
switch msgType {
case msgTypeTx:
msg = binary.ReadBinary(&TxMessage{}, r, n, &err)
default:
msg = nil
}
return
}
//-------------------------------------
type TxMessage struct {
Tx types.Tx
}
func (m *TxMessage) TypeByte() byte { return msgTypeTx }
func (m *TxMessage) String() string {
return fmt.Sprintf("[TxMessage %v]", m.Tx)
}