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251 lines
6.8 KiB
251 lines
6.8 KiB
package evidence
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import (
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"fmt"
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"time"
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clist "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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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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"github.com/tendermint/tendermint/types"
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)
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const (
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EvidenceChannel = byte(0x38)
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maxMsgSize = 1048576 // 1MB TODO make it configurable
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// broadcast all uncommitted evidence this often. This sets when the reactor
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// goes back to the start of the list and begins sending the evidence again.
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// Most evidence should be committed in the very next block that is why we wait
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// just over the block production rate before sending evidence again.
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broadcastEvidenceIntervalS = 10
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// If a message fails wait this much before sending it again
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peerRetryMessageIntervalMS = 100
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)
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// Reactor handles evpool evidence broadcasting amongst peers.
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type Reactor struct {
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p2p.BaseReactor
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evpool *Pool
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eventBus *types.EventBus
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}
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// NewReactor returns a new Reactor with the given config and evpool.
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func NewReactor(evpool *Pool) *Reactor {
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evR := &Reactor{
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evpool: evpool,
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}
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evR.BaseReactor = *p2p.NewBaseReactor("Evidence", evR)
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return evR
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}
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// SetLogger sets the Logger on the reactor and the underlying Evidence.
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func (evR *Reactor) SetLogger(l log.Logger) {
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evR.Logger = l
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evR.evpool.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 (evR *Reactor) GetChannels() []*p2p.ChannelDescriptor {
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return []*p2p.ChannelDescriptor{
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{
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ID: EvidenceChannel,
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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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func (evR *Reactor) AddPeer(peer p2p.Peer) {
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go evR.broadcastEvidenceRoutine(peer)
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}
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// Receive implements Reactor.
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// It adds any received evidence to the evpool.
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func (evR *Reactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
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evis, err := decodeMsg(msgBytes)
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if err != nil {
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evR.Logger.Error("Error decoding message", "src", src, "chId", chID, "err", err, "bytes", msgBytes)
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evR.Switch.StopPeerForError(src, err)
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return
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}
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for _, ev := range evis {
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err := evR.evpool.AddEvidence(ev)
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switch err.(type) {
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case *types.ErrInvalidEvidence:
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evR.Logger.Error(err.Error())
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// punish peer
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evR.Switch.StopPeerForError(src, err)
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return
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case nil:
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default:
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// continue to the next piece of evidence
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evR.Logger.Error("Evidence has not been added", "evidence", evis, "err", err)
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}
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}
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}
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// SetEventBus implements events.Eventable.
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func (evR *Reactor) SetEventBus(b *types.EventBus) {
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evR.eventBus = b
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}
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// Modeled after the mempool routine.
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// - Evidence accumulates in a clist.
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// - Each peer has a routine that iterates through the clist,
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// sending available evidence to the peer.
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// - If we're waiting for new evidence and the list is not empty,
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// start iterating from the beginning again.
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func (evR *Reactor) broadcastEvidenceRoutine(peer p2p.Peer) {
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var next *clist.CElement
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for {
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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 <-evR.evpool.EvidenceWaitChan(): // Wait until evidence is available
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if next = evR.evpool.EvidenceFront(); 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 <-evR.Quit():
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return
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}
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}
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ev := next.Value.(types.Evidence)
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evis := evR.prepareEvidenceMessage(peer, ev)
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if len(evis) > 0 {
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msgBytes, err := encodeMsg(evis)
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if err != nil {
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panic(err)
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}
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evR.Logger.Debug("Gossiping evidence to peer", "ev", ev, "peer", peer.ID())
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success := peer.Send(EvidenceChannel, msgBytes)
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if !success {
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time.Sleep(peerRetryMessageIntervalMS * time.Millisecond)
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continue
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}
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}
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afterCh := time.After(time.Second * broadcastEvidenceIntervalS)
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select {
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case <-afterCh:
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// start from the beginning every tick.
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// TODO: only do this if we're at the end of the list!
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next = nil
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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 <-evR.Quit():
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return
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}
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}
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}
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// Returns the message to send to the peer, or nil if the evidence is invalid for the peer.
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// If message is nil, we should sleep and try again.
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func (evR Reactor) prepareEvidenceMessage(
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peer p2p.Peer,
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ev types.Evidence,
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) (evis []types.Evidence) {
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// make sure the peer is up to date
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evHeight := ev.Height()
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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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return nil
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}
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// NOTE: We only send evidence to peers where
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// peerHeight - maxAge < evidenceHeight < peerHeight
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var (
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peerHeight = peerState.GetHeight()
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params = evR.evpool.State().ConsensusParams.Evidence
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ageNumBlocks = peerHeight - evHeight
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)
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if peerHeight <= evHeight { // peer is behind. sleep while he catches up
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return nil
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} else if ageNumBlocks > params.MaxAgeNumBlocks { // evidence is too old relative to the peer, skip
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// NOTE: if evidence is too old for an honest peer, then we're behind and
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// either it already got committed or it never will!
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evR.Logger.Info("Not sending peer old evidence",
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"peerHeight", peerHeight,
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"evHeight", evHeight,
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"maxAgeNumBlocks", params.MaxAgeNumBlocks,
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"lastBlockTime", evR.evpool.State().LastBlockTime,
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"maxAgeDuration", params.MaxAgeDuration,
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"peer", peer,
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)
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return nil
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}
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// send evidence
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return []types.Evidence{ev}
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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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// encodemsg takes a array of evidence
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// returns the byte encoding of the List Message
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func encodeMsg(evis []types.Evidence) ([]byte, error) {
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evi := make([]tmproto.Evidence, len(evis))
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for i := 0; i < len(evis); i++ {
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ev, err := types.EvidenceToProto(evis[i])
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if err != nil {
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return nil, err
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}
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evi[i] = *ev
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}
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epl := tmproto.EvidenceList{
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Evidence: evi,
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}
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return epl.Marshal()
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}
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// decodemsg takes an array of bytes
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// returns an array of evidence
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func decodeMsg(bz []byte) (evis []types.Evidence, err error) {
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lm := tmproto.EvidenceList{}
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if err := lm.Unmarshal(bz); err != nil {
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return nil, err
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}
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evis = make([]types.Evidence, len(lm.Evidence))
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for i := 0; i < len(lm.Evidence); i++ {
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ev, err := types.EvidenceFromProto(&lm.Evidence[i])
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if err != nil {
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return nil, err
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}
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evis[i] = ev
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}
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for i, ev := range evis {
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if err := ev.ValidateBasic(); err != nil {
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return nil, fmt.Errorf("invalid evidence (#%d): %v", i, err)
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}
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}
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return evis, nil
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}
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