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reactor.go
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reactor.go
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package mempool
import (
"context"
"errors"
"fmt"
"time"
cfg "github.com/cometbft/cometbft/config"
"github.com/cometbft/cometbft/libs/clist"
"github.com/cometbft/cometbft/libs/log"
"github.com/cometbft/cometbft/p2p"
protomem "github.com/cometbft/cometbft/proto/tendermint/mempool"
"github.com/cometbft/cometbft/types"
"golang.org/x/sync/semaphore"
)
// Reactor handles mempool tx broadcasting amongst peers.
// It maintains a map from peer ID to counter, to prevent gossiping txs to the
// peers you received it from.
type Reactor struct {
p2p.BaseReactor
config *cfg.MempoolConfig
mempool *CListMempool
ids *mempoolIDs
// Semaphores to keep track of how many connections to peers are active for broadcasting
// transactions. Each semaphore has a capacity that puts an upper bound on the number of
// connections for different groups of peers.
activePersistentPeersSemaphore *semaphore.Weighted
activeNonPersistentPeersSemaphore *semaphore.Weighted
}
// NewReactor returns a new Reactor with the given config and mempool.
func NewReactor(config *cfg.MempoolConfig, mempool *CListMempool) *Reactor {
memR := &Reactor{
config: config,
mempool: mempool,
ids: newMempoolIDs(),
}
memR.BaseReactor = *p2p.NewBaseReactor("Mempool", memR)
memR.activePersistentPeersSemaphore = semaphore.NewWeighted(int64(memR.config.ExperimentalMaxGossipConnectionsToPersistentPeers))
memR.activeNonPersistentPeersSemaphore = semaphore.NewWeighted(int64(memR.config.ExperimentalMaxGossipConnectionsToNonPersistentPeers))
return memR
}
// InitPeer implements Reactor by creating a state for the peer.
func (memR *Reactor) InitPeer(peer p2p.Peer) p2p.Peer {
memR.ids.ReserveForPeer(peer)
return peer
}
// SetLogger sets the Logger on the reactor and the underlying mempool.
func (memR *Reactor) SetLogger(l log.Logger) {
memR.Logger = l
memR.mempool.SetLogger(l)
}
// OnStart implements p2p.BaseReactor.
func (memR *Reactor) OnStart() error {
if !memR.config.Broadcast {
memR.Logger.Info("Tx broadcasting is disabled")
}
return nil
}
// GetChannels implements Reactor by returning the list of channels for this
// reactor.
func (memR *Reactor) GetChannels() []*p2p.ChannelDescriptor {
largestTx := make([]byte, memR.config.MaxTxBytes)
batchMsg := protomem.Message{
Sum: &protomem.Message_Txs{
Txs: &protomem.Txs{Txs: [][]byte{largestTx}},
},
}
return []*p2p.ChannelDescriptor{
{
ID: MempoolChannel,
Priority: 5,
RecvMessageCapacity: batchMsg.Size(),
MessageType: &protomem.Message{},
},
}
}
// AddPeer implements Reactor.
// It starts a broadcast routine ensuring all txs are forwarded to the given peer.
func (memR *Reactor) AddPeer(peer p2p.Peer) {
if memR.config.Broadcast {
go func() {
// Always forward transactions to unconditional peers.
if !memR.Switch.IsPeerUnconditional(peer.ID()) {
// Depending on the type of peer, we choose a semaphore to limit the gossiping peers.
var peerSemaphore *semaphore.Weighted
if peer.IsPersistent() && memR.config.ExperimentalMaxGossipConnectionsToPersistentPeers > 0 {
peerSemaphore = memR.activePersistentPeersSemaphore
} else if !peer.IsPersistent() && memR.config.ExperimentalMaxGossipConnectionsToNonPersistentPeers > 0 {
peerSemaphore = memR.activeNonPersistentPeersSemaphore
}
if peerSemaphore != nil {
for peer.IsRunning() {
// Block on the semaphore until a slot is available to start gossiping with this peer.
// Do not block indefinitely, in case the peer is disconnected before gossiping starts.
ctxTimeout, cancel := context.WithTimeout(context.TODO(), 30*time.Second)
// Block sending transactions to peer until one of the connections become
// available in the semaphore.
err := peerSemaphore.Acquire(ctxTimeout, 1)
cancel()
if err != nil {
continue
}
// Release semaphore to allow other peer to start sending transactions.
defer peerSemaphore.Release(1)
break
}
}
}
memR.mempool.metrics.ActiveOutboundConnections.Add(1)
defer memR.mempool.metrics.ActiveOutboundConnections.Add(-1)
memR.broadcastTxRoutine(peer)
}()
}
}
// RemovePeer implements Reactor.
func (memR *Reactor) RemovePeer(peer p2p.Peer, _ interface{}) {
memR.ids.Reclaim(peer)
// broadcast routine checks if peer is gone and returns
}
// Receive implements Reactor.
// It adds any received transactions to the mempool.
func (memR *Reactor) Receive(e p2p.Envelope) {
memR.Logger.Debug("Receive", "src", e.Src, "chId", e.ChannelID, "msg", e.Message)
switch msg := e.Message.(type) {
case *protomem.Txs:
protoTxs := msg.GetTxs()
if len(protoTxs) == 0 {
memR.Logger.Error("received empty txs from peer", "src", e.Src)
return
}
txInfo := TxInfo{SenderID: memR.ids.GetForPeer(e.Src)}
if e.Src != nil {
txInfo.SenderP2PID = e.Src.ID()
}
var err error
for _, tx := range protoTxs {
ntx := types.Tx(tx)
err = memR.mempool.CheckTx(ntx, nil, txInfo)
if errors.Is(err, ErrTxInCache) {
memR.Logger.Debug("Tx already exists in cache", "tx", ntx.String())
} else if err != nil {
memR.Logger.Info("Could not check tx", "tx", ntx.String(), "err", err)
}
}
default:
memR.Logger.Error("unknown message type", "src", e.Src, "chId", e.ChannelID, "msg", e.Message)
memR.Switch.StopPeerForError(e.Src, fmt.Errorf("mempool cannot handle message of type: %T", e.Message))
return
}
// broadcasting happens from go routines per peer
}
// PeerState describes the state of a peer.
type PeerState interface {
GetHeight() int64
}
// Send new mempool txs to peer.
func (memR *Reactor) broadcastTxRoutine(peer p2p.Peer) {
peerID := memR.ids.GetForPeer(peer)
var next *clist.CElement
for {
// In case of both next.NextWaitChan() and peer.Quit() are variable at the same time
if !memR.IsRunning() || !peer.IsRunning() {
return
}
// This happens because the CElement we were looking at got garbage
// collected (removed). That is, .NextWait() returned nil. Go ahead and
// start from the beginning.
if next == nil {
select {
case <-memR.mempool.TxsWaitChan(): // Wait until a tx is available
if next = memR.mempool.TxsFront(); next == nil {
continue
}
case <-peer.Quit():
return
case <-memR.Quit():
return
}
}
// Make sure the peer is up to date.
peerState, ok := peer.Get(types.PeerStateKey).(PeerState)
if !ok {
// Peer does not have a state yet. We set it in the consensus reactor, but
// when we add peer in Switch, the order we call reactors#AddPeer is
// different every time due to us using a map. Sometimes other reactors
// will be initialized before the consensus reactor. We should wait a few
// milliseconds and retry.
time.Sleep(PeerCatchupSleepIntervalMS * time.Millisecond)
continue
}
// Allow for a lag of 1 block.
memTx := next.Value.(*mempoolTx)
if peerState.GetHeight() < memTx.Height()-1 {
time.Sleep(PeerCatchupSleepIntervalMS * time.Millisecond)
continue
}
// NOTE: Transaction batching was disabled due to
// https://github.com/tendermint/tendermint/issues/5796
if !memTx.isSender(peerID) {
success := peer.Send(p2p.Envelope{
ChannelID: MempoolChannel,
Message: &protomem.Txs{Txs: [][]byte{memTx.tx}},
})
if !success {
time.Sleep(PeerCatchupSleepIntervalMS * time.Millisecond)
continue
}
}
select {
case <-next.NextWaitChan():
// see the start of the for loop for nil check
next = next.Next()
case <-peer.Quit():
return
case <-memR.Quit():
return
}
}
}
// TxsMessage is a Message containing transactions.
type TxsMessage struct {
Txs []types.Tx
}
// String returns a string representation of the TxsMessage.
func (m *TxsMessage) String() string {
return fmt.Sprintf("[TxsMessage %v]", m.Txs)
}