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289 lines
7.6 KiB
289 lines
7.6 KiB
package mempool
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import (
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"fmt"
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"math"
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"sync"
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"time"
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gogotypes "github.com/gogo/protobuf/types"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/libs/clist"
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"github.com/tendermint/tendermint/libs/log"
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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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protoOverheadForTxMessage = 4
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peerCatchupSleepIntervalMS = 100 // If peer is behind, sleep this amount
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// UnknownPeerID is the peer ID to use when running CheckTx when there is
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// no peer (e.g. RPC)
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UnknownPeerID uint16 = 0
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maxActiveIDs = math.MaxUint16
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)
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// Reactor handles mempool tx broadcasting amongst peers.
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// It maintains a map from peer ID to counter, to prevent gossiping txs to the
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// peers you received it from.
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type Reactor struct {
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p2p.BaseReactor
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config *cfg.MempoolConfig
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mempool *CListMempool
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ids *mempoolIDs
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}
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type mempoolIDs struct {
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mtx sync.RWMutex
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peerMap map[p2p.ID]uint16
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nextID uint16 // assumes that a node will never have over 65536 active peers
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activeIDs map[uint16]struct{} // used to check if a given peerID key is used, the value doesn't matter
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}
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// Reserve searches for the next unused ID and assigns it to the
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// peer.
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func (ids *mempoolIDs) ReserveForPeer(peer p2p.Peer) {
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ids.mtx.Lock()
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defer ids.mtx.Unlock()
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curID := ids.nextPeerID()
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ids.peerMap[peer.ID()] = curID
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ids.activeIDs[curID] = struct{}{}
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}
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// nextPeerID returns the next unused peer ID to use.
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// This assumes that ids's mutex is already locked.
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func (ids *mempoolIDs) nextPeerID() uint16 {
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if len(ids.activeIDs) == maxActiveIDs {
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panic(fmt.Sprintf("node has maximum %d active IDs and wanted to get one more", maxActiveIDs))
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}
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_, idExists := ids.activeIDs[ids.nextID]
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for idExists {
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ids.nextID++
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_, idExists = ids.activeIDs[ids.nextID]
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}
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curID := ids.nextID
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ids.nextID++
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return curID
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}
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// Reclaim returns the ID reserved for the peer back to unused pool.
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func (ids *mempoolIDs) Reclaim(peer p2p.Peer) {
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ids.mtx.Lock()
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defer ids.mtx.Unlock()
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removedID, ok := ids.peerMap[peer.ID()]
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if ok {
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delete(ids.activeIDs, removedID)
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delete(ids.peerMap, peer.ID())
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}
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}
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// GetForPeer returns an ID reserved for the peer.
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func (ids *mempoolIDs) GetForPeer(peer p2p.Peer) uint16 {
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ids.mtx.RLock()
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defer ids.mtx.RUnlock()
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return ids.peerMap[peer.ID()]
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}
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func newMempoolIDs() *mempoolIDs {
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return &mempoolIDs{
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peerMap: make(map[p2p.ID]uint16),
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activeIDs: map[uint16]struct{}{0: {}},
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nextID: 1, // reserve unknownPeerID(0) for mempoolReactor.BroadcastTx
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}
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}
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// NewReactor returns a new Reactor with the given config and mempool.
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func NewReactor(config *cfg.MempoolConfig, mempool *CListMempool) *Reactor {
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memR := &Reactor{
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config: config,
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mempool: mempool,
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ids: newMempoolIDs(),
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}
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memR.BaseReactor = *p2p.NewBaseReactor("Mempool", memR)
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return memR
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}
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// InitPeer implements Reactor by creating a state for the peer.
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func (memR *Reactor) InitPeer(peer p2p.Peer) p2p.Peer {
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memR.ids.ReserveForPeer(peer)
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return peer
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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 *Reactor) 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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// OnStart implements p2p.BaseReactor.
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func (memR *Reactor) OnStart() error {
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if !memR.config.Broadcast {
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memR.Logger.Info("Tx broadcasting is disabled")
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}
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return nil
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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 *Reactor) GetChannels() []*p2p.ChannelDescriptor {
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maxMsgSize := calcMaxMsgSize(memR.config.MaxTxBytes)
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return []*p2p.ChannelDescriptor{
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{
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ID: MempoolChannel,
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Priority: 5,
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RecvMessageCapacity: maxMsgSize,
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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 *Reactor) AddPeer(peer p2p.Peer) {
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if memR.config.Broadcast {
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go memR.broadcastTxRoutine(peer)
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}
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}
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// RemovePeer implements Reactor.
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func (memR *Reactor) RemovePeer(peer p2p.Peer, reason interface{}) {
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memR.ids.Reclaim(peer)
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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 *Reactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
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msg, err := memR.decodeMsg(msgBytes)
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if err != nil {
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memR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
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memR.Switch.StopPeerForError(src, 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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txInfo := TxInfo{SenderID: memR.ids.GetForPeer(src)}
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if src != nil {
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txInfo.SenderP2PID = src.ID()
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}
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err = memR.mempool.CheckTx(msg.Tx, nil, txInfo)
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if err != nil {
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memR.Logger.Info("Could not check tx", "tx", txID(msg.Tx), "err", err)
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}
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// broadcasting happens from go routines per peer
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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() int64
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}
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// Send new mempool txs to peer.
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func (memR *Reactor) broadcastTxRoutine(peer p2p.Peer) {
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peerID := memR.ids.GetForPeer(peer)
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var next *clist.CElement
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for {
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// In case of both next.NextWaitChan() and peer.Quit() are variable at the same time
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if !memR.IsRunning() || !peer.IsRunning() {
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return
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}
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// This happens because the CElement we were looking at got garbage
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// collected (removed). That is, .NextWait() returned nil. Go ahead and
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// start from the beginning.
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if next == nil {
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select {
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case <-memR.mempool.TxsWaitChan(): // Wait until a tx is available
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if next = memR.mempool.TxsFront(); next == nil {
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continue
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}
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case <-peer.Quit():
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return
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case <-memR.Quit():
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return
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}
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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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peerState, ok := peer.Get(types.PeerStateKey).(PeerState)
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if !ok {
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// Peer does not have a state yet. We set it in the consensus reactor, but
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// when we add peer in Switch, the order we call reactors#AddPeer is
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// different every time due to us using a map. Sometimes other reactors
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// will be initialized before the consensus reactor. We should wait a few
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// milliseconds and retry.
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time.Sleep(peerCatchupSleepIntervalMS * time.Millisecond)
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continue
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}
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if peerState.GetHeight() < memTx.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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// ensure peer hasn't already sent us this tx
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if _, ok := memTx.senders.Load(peerID); !ok {
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msg := gogotypes.BytesValue{Value: []byte(memTx.tx)}
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bz, err := msg.Marshal()
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if err != nil {
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panic(err)
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}
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success := peer.Send(MempoolChannel, bz)
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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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}
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select {
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case <-next.NextWaitChan():
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// see the start of the for loop for nil check
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next = next.Next()
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case <-peer.Quit():
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return
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case <-memR.Quit():
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return
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}
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}
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}
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//-----------------------------------------------------------------------------
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// Messages
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func (memR *Reactor) decodeMsg(bz []byte) (TxMessage, error) {
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msg := gogotypes.BytesValue{}
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err := msg.Unmarshal(bz)
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if err != nil {
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return TxMessage{}, err
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}
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txMsg := TxMessage{
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Tx: types.Tx(msg.Value),
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}
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return txMsg, err
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}
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//-------------------------------------
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// TxMessage is a Message 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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// calcMaxMsgSize returns the max size of TxMessage
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// account for proto overhead of bytesValue
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func calcMaxMsgSize(maxTxSize int) int {
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return maxTxSize + protoOverheadForTxMessage
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}
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