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192 lines
5.2 KiB
192 lines
5.2 KiB
package mempool
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import (
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"bytes"
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"fmt"
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"reflect"
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"time"
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abci "github.com/tendermint/abci/types"
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wire "github.com/tendermint/go-wire"
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"github.com/tendermint/tmlibs/clist"
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"github.com/tendermint/tmlibs/log"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/p2p"
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"github.com/tendermint/tendermint/types"
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)
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const (
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MempoolChannel = byte(0x30)
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maxMempoolMessageSize = 1048576 // 1MB TODO make it configurable
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peerCatchupSleepIntervalMS = 100 // If peer is behind, sleep this amount
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)
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// MempoolReactor handles mempool tx broadcasting amongst peers.
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type MempoolReactor struct {
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p2p.BaseReactor
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config *cfg.MempoolConfig
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Mempool *Mempool
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evsw types.EventSwitch
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}
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// NewMempoolReactor returns a new MempoolReactor with the given config and mempool.
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func NewMempoolReactor(config *cfg.MempoolConfig, mempool *Mempool) *MempoolReactor {
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memR := &MempoolReactor{
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config: config,
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Mempool: mempool,
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}
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memR.BaseReactor = *p2p.NewBaseReactor("MempoolReactor", memR)
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return memR
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}
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// SetLogger sets the Logger on the reactor and the underlying Mempool.
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func (memR *MempoolReactor) SetLogger(l log.Logger) {
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memR.Logger = l
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memR.Mempool.SetLogger(l)
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}
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// GetChannels implements Reactor.
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// It returns the list of channels for this reactor.
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func (memR *MempoolReactor) GetChannels() []*p2p.ChannelDescriptor {
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return []*p2p.ChannelDescriptor{
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&p2p.ChannelDescriptor{
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ID: MempoolChannel,
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Priority: 5,
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},
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}
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}
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// AddPeer implements Reactor.
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// It starts a broadcast routine ensuring all txs are forwarded to the given peer.
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func (memR *MempoolReactor) AddPeer(peer *p2p.Peer) {
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go memR.broadcastTxRoutine(peer)
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}
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// RemovePeer implements Reactor.
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func (memR *MempoolReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
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// broadcast routine checks if peer is gone and returns
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}
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// Receive implements Reactor.
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// It adds any received transactions to the mempool.
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func (memR *MempoolReactor) Receive(chID byte, src *p2p.Peer, msgBytes []byte) {
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_, msg, err := DecodeMessage(msgBytes)
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if err != nil {
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memR.Logger.Error("Error decoding message", "err", err)
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return
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}
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memR.Logger.Debug("Receive", "src", src, "chId", chID, "msg", msg)
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switch msg := msg.(type) {
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case *TxMessage:
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err := memR.Mempool.CheckTx(msg.Tx, nil)
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if err != nil {
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memR.Logger.Info("Could not check tx", "tx", msg.Tx, "err", err)
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}
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// broadcasting happens from go routines per peer
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default:
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memR.Logger.Error(fmt.Sprintf("Unknown message type %v", reflect.TypeOf(msg)))
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}
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}
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// BroadcastTx is an alias for Mempool.CheckTx. Broadcasting itself happens in peer routines.
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func (memR *MempoolReactor) BroadcastTx(tx types.Tx, cb func(*abci.Response)) error {
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return memR.Mempool.CheckTx(tx, cb)
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}
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// PeerState describes the state of a peer.
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type PeerState interface {
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GetHeight() int
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}
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// Peer describes a peer.
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type Peer interface {
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IsRunning() bool
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Send(byte, interface{}) bool
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Get(string) interface{}
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}
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// Send new mempool txs to peer.
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// TODO: Handle mempool or reactor shutdown?
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// As is this routine may block forever if no new txs come in.
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func (memR *MempoolReactor) broadcastTxRoutine(peer Peer) {
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if !memR.config.Broadcast {
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return
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}
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var next *clist.CElement
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for {
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if !memR.IsRunning() || !peer.IsRunning() {
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return // Quit!
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}
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if next == nil {
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// This happens because the CElement we were looking at got
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// garbage collected (removed). That is, .NextWait() returned nil.
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// Go ahead and start from the beginning.
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next = memR.Mempool.TxsFrontWait() // Wait until a tx is available
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}
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memTx := next.Value.(*mempoolTx)
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// make sure the peer is up to date
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height := memTx.Height()
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if peerState_i := peer.Get(types.PeerStateKey); peerState_i != nil {
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peerState := peerState_i.(PeerState)
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if peerState.GetHeight() < height-1 { // Allow for a lag of 1 block
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time.Sleep(peerCatchupSleepIntervalMS * time.Millisecond)
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continue
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}
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}
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// send memTx
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msg := &TxMessage{Tx: memTx.tx}
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success := peer.Send(MempoolChannel, struct{ MempoolMessage }{msg})
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if !success {
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time.Sleep(peerCatchupSleepIntervalMS * time.Millisecond)
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continue
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}
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next = next.NextWait()
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continue
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}
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}
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// SetEventSwitch implements events.Eventable.
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func (memR *MempoolReactor) SetEventSwitch(evsw types.EventSwitch) {
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memR.evsw = evsw
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}
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//-----------------------------------------------------------------------------
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// Messages
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const (
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msgTypeTx = byte(0x01)
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)
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// MempoolMessage is a message sent or received by the MempoolReactor.
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type MempoolMessage interface{}
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var _ = wire.RegisterInterface(
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struct{ MempoolMessage }{},
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wire.ConcreteType{&TxMessage{}, msgTypeTx},
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)
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// DecodeMessage decodes a byte-array into a MempoolMessage.
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func DecodeMessage(bz []byte) (msgType byte, msg MempoolMessage, err error) {
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msgType = bz[0]
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n := new(int)
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r := bytes.NewReader(bz)
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msg = wire.ReadBinary(struct{ MempoolMessage }{}, r, maxMempoolMessageSize, n, &err).(struct{ MempoolMessage }).MempoolMessage
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return
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}
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//-------------------------------------
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// TxMessage is a MempoolMessage containing a transaction.
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type TxMessage struct {
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Tx types.Tx
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}
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// String returns a string representation of the TxMessage.
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func (m *TxMessage) String() string {
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return fmt.Sprintf("[TxMessage %v]", m.Tx)
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}
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