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tendermint/p2p/pex/pex_reactor.go

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package pex
import (
"errors"
"fmt"
"sync"
"time"
"github.com/gogo/protobuf/proto"
"github.com/tendermint/tendermint/libs/cmap"
tmmath "github.com/tendermint/tendermint/libs/math"
tmrand "github.com/tendermint/tendermint/libs/rand"
"github.com/tendermint/tendermint/libs/service"
"github.com/tendermint/tendermint/p2p"
"github.com/tendermint/tendermint/p2p/conn"
tmp2p "github.com/tendermint/tendermint/proto/tendermint/p2p"
)
type Peer = p2p.Peer
const (
// PexChannel is a channel for PEX messages
PexChannel = byte(0x00)
// over-estimate of max NetAddress size
// hexID (40) + IP (16) + Port (2) + Name (100) ...
// NOTE: dont use massive DNS name ..
maxAddressSize = 256
// NOTE: amplificaiton factor!
// small request results in up to maxMsgSize response
maxMsgSize = maxAddressSize * maxGetSelection
// ensure we have enough peers
defaultEnsurePeersPeriod = 30 * time.Second
// Seed/Crawler constants
// minTimeBetweenCrawls is a minimum time between attempts to crawl a peer.
minTimeBetweenCrawls = 2 * time.Minute
// check some peers every this
crawlPeerPeriod = 30 * time.Second
maxAttemptsToDial = 16 // ~ 35h in total (last attempt - 18h)
// if node connects to seed, it does not have any trusted peers.
// Especially in the beginning, node should have more trusted peers than
// untrusted.
biasToSelectNewPeers = 30 // 70 to select good peers
// if a peer is marked bad, it will be banned for at least this time period
defaultBanTime = 24 * time.Hour
)
type errMaxAttemptsToDial struct {
}
func (e errMaxAttemptsToDial) Error() string {
return fmt.Sprintf("reached max attempts %d to dial", maxAttemptsToDial)
}
type errTooEarlyToDial struct {
backoffDuration time.Duration
lastDialed time.Time
}
func (e errTooEarlyToDial) Error() string {
return fmt.Sprintf(
"too early to dial (backoff duration: %d, last dialed: %v, time since: %v)",
e.backoffDuration, e.lastDialed, time.Since(e.lastDialed))
}
// Reactor handles PEX (peer exchange) and ensures that an
// adequate number of peers are connected to the switch.
//
// It uses `AddrBook` (address book) to store `NetAddress`es of the peers.
//
// ## Preventing abuse
//
// Only accept pexAddrsMsg from peers we sent a corresponding pexRequestMsg too.
// Only accept one pexRequestMsg every ~defaultEnsurePeersPeriod.
type Reactor struct {
p2p.BaseReactor
book AddrBook
config *ReactorConfig
ensurePeersPeriod time.Duration // TODO: should go in the config
// maps to prevent abuse
requestsSent *cmap.CMap // ID->struct{}: unanswered send requests
lastReceivedRequests *cmap.CMap // ID->time.Time: last time peer requested from us
seedAddrs []*p2p.NetAddress
attemptsToDial sync.Map // address (string) -> {number of attempts (int), last time dialed (time.Time)}
// seed/crawled mode fields
crawlPeerInfos map[p2p.ID]crawlPeerInfo
}
func (r *Reactor) minReceiveRequestInterval() time.Duration {
// NOTE: must be less than ensurePeersPeriod, otherwise we'll request
// peers too quickly from others and they'll think we're bad!
return r.ensurePeersPeriod / 3
}
// ReactorConfig holds reactor specific configuration data.
type ReactorConfig struct {
// Seed/Crawler mode
SeedMode bool
// We want seeds to only advertise good peers. Therefore they should wait at
// least as long as we expect it to take for a peer to become good before
// disconnecting.
SeedDisconnectWaitPeriod time.Duration
// Maximum pause when redialing a persistent peer (if zero, exponential backoff is used)
PersistentPeersMaxDialPeriod time.Duration
// Seeds is a list of addresses reactor may use
// if it can't connect to peers in the addrbook.
Seeds []string
}
type _attemptsToDial struct {
number int
lastDialed time.Time
}
// NewReactor creates new PEX reactor.
func NewReactor(b AddrBook, config *ReactorConfig) *Reactor {
r := &Reactor{
book: b,
config: config,
ensurePeersPeriod: defaultEnsurePeersPeriod,
requestsSent: cmap.NewCMap(),
lastReceivedRequests: cmap.NewCMap(),
crawlPeerInfos: make(map[p2p.ID]crawlPeerInfo),
}
r.BaseReactor = *p2p.NewBaseReactor("PEX", r)
return r
}
// OnStart implements BaseService
func (r *Reactor) OnStart() error {
err := r.book.Start()
if err != nil && err != service.ErrAlreadyStarted {
return err
}
numOnline, seedAddrs, err := r.checkSeeds()
if err != nil {
return err
} else if numOnline == 0 && r.book.Empty() {
return errors.New("address book is empty and couldn't resolve any seed nodes")
}
r.seedAddrs = seedAddrs
// Check if this node should run
// in seed/crawler mode
if r.config.SeedMode {
go r.crawlPeersRoutine()
} else {
go r.ensurePeersRoutine()
}
return nil
}
// OnStop implements BaseService
func (r *Reactor) OnStop() {
if err := r.book.Stop(); err != nil {
r.Logger.Error("Error stopping address book", "err", err)
}
}
// GetChannels implements Reactor
func (r *Reactor) GetChannels() []*conn.ChannelDescriptor {
return []*conn.ChannelDescriptor{
{
ID: PexChannel,
Priority: 1,
SendQueueCapacity: 10,
RecvMessageCapacity: maxMsgSize,
},
}
}
// AddPeer implements Reactor by adding peer to the address book (if inbound)
// or by requesting more addresses (if outbound).
func (r *Reactor) AddPeer(p Peer) {
if p.IsOutbound() {
// For outbound peers, the address is already in the books -
// either via DialPeersAsync or r.Receive.
// Ask it for more peers if we need.
if r.book.NeedMoreAddrs() {
r.RequestAddrs(p)
}
} else {
// inbound peer is its own source
addr, err := p.NodeInfo().NetAddress()
if err != nil {
r.Logger.Error("Failed to get peer NetAddress", "err", err, "peer", p)
return
}
// Make it explicit that addr and src are the same for an inbound peer.
src := addr
// add to book. dont RequestAddrs right away because
// we don't trust inbound as much - let ensurePeersRoutine handle it.
err = r.book.AddAddress(addr, src)
r.logErrAddrBook(err)
}
}
// RemovePeer implements Reactor by resetting peer's requests info.
func (r *Reactor) RemovePeer(p Peer, reason interface{}) {
id := string(p.ID())
r.requestsSent.Delete(id)
r.lastReceivedRequests.Delete(id)
}
func (r *Reactor) logErrAddrBook(err error) {
if err != nil {
switch err.(type) {
case ErrAddrBookNilAddr:
r.Logger.Error("Failed to add new address", "err", err)
default:
// non-routable, self, full book, private, etc.
r.Logger.Debug("Failed to add new address", "err", err)
}
}
}
// Receive implements Reactor by handling incoming PEX messages.
// XXX: do not call any methods that can block or incur heavy processing.
// https://github.com/tendermint/tendermint/issues/2888
func (r *Reactor) Receive(chID byte, src Peer, msgBytes []byte) {
msg, err := decodeMsg(msgBytes)
if err != nil {
r.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
r.Switch.StopPeerForError(src, err)
return
}
r.Logger.Debug("Received message", "src", src, "chId", chID, "msg", msg)
switch msg := msg.(type) {
case *tmp2p.PexRequest:
// NOTE: this is a prime candidate for amplification attacks,
// so it's important we
// 1) restrict how frequently peers can request
// 2) limit the output size
// If we're a seed and this is an inbound peer,
// respond once and disconnect.
if r.config.SeedMode && !src.IsOutbound() {
id := string(src.ID())
v := r.lastReceivedRequests.Get(id)
if v != nil {
// FlushStop/StopPeer are already
// running in a go-routine.
return
}
r.lastReceivedRequests.Set(id, time.Now())
// Send addrs and disconnect
r.SendAddrs(src, r.book.GetSelectionWithBias(biasToSelectNewPeers))
go func() {
// In a go-routine so it doesn't block .Receive.
src.FlushStop()
r.Switch.StopPeerGracefully(src)
}()
} else {
// Check we're not receiving requests too frequently.
if err := r.receiveRequest(src); err != nil {
r.Switch.StopPeerForError(src, err)
r.book.MarkBad(src.SocketAddr(), defaultBanTime)
return
}
r.SendAddrs(src, r.book.GetSelection())
}
case *tmp2p.PexAddrs:
// If we asked for addresses, add them to the book
addrs, err := p2p.NetAddressesFromProto(msg.Addrs)
if err != nil {
r.Switch.StopPeerForError(src, err)
r.book.MarkBad(src.SocketAddr(), defaultBanTime)
return
}
err = r.ReceiveAddrs(addrs, src)
if err != nil {
r.Switch.StopPeerForError(src, err)
if err == ErrUnsolicitedList {
r.book.MarkBad(src.SocketAddr(), defaultBanTime)
}
return
}
default:
r.Logger.Error(fmt.Sprintf("Unknown message type %T", msg))
}
}
// enforces a minimum amount of time between requests
func (r *Reactor) receiveRequest(src Peer) error {
id := string(src.ID())
v := r.lastReceivedRequests.Get(id)
if v == nil {
// initialize with empty time
lastReceived := time.Time{}
r.lastReceivedRequests.Set(id, lastReceived)
return nil
}
lastReceived := v.(time.Time)
if lastReceived.Equal(time.Time{}) {
// first time gets a free pass. then we start tracking the time
lastReceived = time.Now()
r.lastReceivedRequests.Set(id, lastReceived)
return nil
}
now := time.Now()
minInterval := r.minReceiveRequestInterval()
if now.Sub(lastReceived) < minInterval {
return fmt.Errorf(
"peer (%v) sent next PEX request too soon. lastReceived: %v, now: %v, minInterval: %v. Disconnecting",
src.ID(),
lastReceived,
now,
minInterval,
)
}
r.lastReceivedRequests.Set(id, now)
return nil
}
// RequestAddrs asks peer for more addresses if we do not already have a
// request out for this peer.
func (r *Reactor) RequestAddrs(p Peer) {
id := string(p.ID())
if r.requestsSent.Has(id) {
return
}
r.Logger.Debug("Request addrs", "from", p)
r.requestsSent.Set(id, struct{}{})
p.Send(PexChannel, mustEncode(&tmp2p.PexRequest{}))
}
// ReceiveAddrs adds the given addrs to the addrbook if theres an open
// request for this peer and deletes the open request.
// If there's no open request for the src peer, it returns an error.
func (r *Reactor) ReceiveAddrs(addrs []*p2p.NetAddress, src Peer) error {
id := string(src.ID())
if !r.requestsSent.Has(id) {
return ErrUnsolicitedList
}
r.requestsSent.Delete(id)
srcAddr, err := src.NodeInfo().NetAddress()
if err != nil {
return err
}
srcIsSeed := false
for _, seedAddr := range r.seedAddrs {
if seedAddr.Equals(srcAddr) {
srcIsSeed = true
break
}
}
for _, netAddr := range addrs {
// NOTE: we check netAddr validity and routability in book#AddAddress.
err = r.book.AddAddress(netAddr, srcAddr)
if err != nil {
r.logErrAddrBook(err)
// XXX: should we be strict about incoming data and disconnect from a
// peer here too?
continue
}
// If this address came from a seed node, try to connect to it without
// waiting (#2093)
if srcIsSeed {
r.Logger.Info("Will dial address, which came from seed", "addr", netAddr, "seed", srcAddr)
go func(addr *p2p.NetAddress) {
err := r.dialPeer(addr)
if err != nil {
switch err.(type) {
case errMaxAttemptsToDial, errTooEarlyToDial, p2p.ErrCurrentlyDialingOrExistingAddress:
r.Logger.Debug(err.Error(), "addr", addr)
default:
r.Logger.Error(err.Error(), "addr", addr)
}
}
}(netAddr)
}
}
return nil
}
// SendAddrs sends addrs to the peer.
func (r *Reactor) SendAddrs(p Peer, netAddrs []*p2p.NetAddress) {
p.Send(PexChannel, mustEncode(&tmp2p.PexAddrs{Addrs: p2p.NetAddressesToProto(netAddrs)}))
}
// SetEnsurePeersPeriod sets period to ensure peers connected.
func (r *Reactor) SetEnsurePeersPeriod(d time.Duration) {
r.ensurePeersPeriod = d
}
// Ensures that sufficient peers are connected. (continuous)
func (r *Reactor) ensurePeersRoutine() {
var (
seed = tmrand.NewRand()
jitter = seed.Int63n(r.ensurePeersPeriod.Nanoseconds())
)
// Randomize first round of communication to avoid thundering herd.
// If no peers are present directly start connecting so we guarantee swift
// setup with the help of configured seeds.
if r.nodeHasSomePeersOrDialingAny() {
time.Sleep(time.Duration(jitter))
}
// fire once immediately.
// ensures we dial the seeds right away if the book is empty
r.ensurePeers()
// fire periodically
ticker := time.NewTicker(r.ensurePeersPeriod)
for {
select {
case <-ticker.C:
r.ensurePeers()
case <-r.Quit():
ticker.Stop()
return
}
}
}
// ensurePeers ensures that sufficient peers are connected. (once)
//
// heuristic that we haven't perfected yet, or, perhaps is manually edited by
// the node operator. It should not be used to compute what addresses are
// already connected or not.
func (r *Reactor) ensurePeers() {
var (
out, in, dial = r.Switch.NumPeers()
numToDial = r.Switch.MaxNumOutboundPeers() - (out + dial)
)
r.Logger.Info(
"Ensure peers",
"numOutPeers", out,
"numInPeers", in,
"numDialing", dial,
"numToDial", numToDial,
)
if numToDial <= 0 {
return
}
// bias to prefer more vetted peers when we have fewer connections.
// not perfect, but somewhate ensures that we prioritize connecting to more-vetted
// NOTE: range here is [10, 90]. Too high ?
newBias := tmmath.MinInt(out, 8)*10 + 10
toDial := make(map[p2p.ID]*p2p.NetAddress)
// Try maxAttempts times to pick numToDial addresses to dial
maxAttempts := numToDial * 3
for i := 0; i < maxAttempts && len(toDial) < numToDial; i++ {
try := r.book.PickAddress(newBias)
if try == nil {
continue
}
if _, selected := toDial[try.ID]; selected {
continue
}
if r.Switch.IsDialingOrExistingAddress(try) {
continue
}
// TODO: consider moving some checks from toDial into here
// so we don't even consider dialing peers that we want to wait
// before dialling again, or have dialed too many times already
r.Logger.Info("Will dial address", "addr", try)
toDial[try.ID] = try
}
// Dial picked addresses
for _, addr := range toDial {
go func(addr *p2p.NetAddress) {
err := r.dialPeer(addr)
if err != nil {
switch err.(type) {
case errMaxAttemptsToDial, errTooEarlyToDial:
r.Logger.Debug(err.Error(), "addr", addr)
default:
r.Logger.Error(err.Error(), "addr", addr)
}
}
}(addr)
}
if r.book.NeedMoreAddrs() {
// Check if banned nodes can be reinstated
r.book.ReinstateBadPeers()
}
if r.book.NeedMoreAddrs() {
// 1) Pick a random peer and ask for more.
peers := r.Switch.Peers().List()
peersCount := len(peers)
if peersCount > 0 {
peer := peers[tmrand.Int()%peersCount]
r.Logger.Info("We need more addresses. Sending pexRequest to random peer", "peer", peer)
r.RequestAddrs(peer)
}
// 2) Dial seeds if we are not dialing anyone.
// This is done in addition to asking a peer for addresses to work-around
// peers not participating in PEX.
if len(toDial) == 0 {
r.Logger.Info("No addresses to dial. Falling back to seeds")
r.dialSeeds()
}
}
}
func (r *Reactor) dialAttemptsInfo(addr *p2p.NetAddress) (attempts int, lastDialed time.Time) {
_attempts, ok := r.attemptsToDial.Load(addr.DialString())
if !ok {
return
}
atd := _attempts.(_attemptsToDial)
return atd.number, atd.lastDialed
}
func (r *Reactor) dialPeer(addr *p2p.NetAddress) error {
attempts, lastDialed := r.dialAttemptsInfo(addr)
if !r.Switch.IsPeerPersistent(addr) && attempts > maxAttemptsToDial {
r.book.MarkBad(addr, defaultBanTime)
return errMaxAttemptsToDial{}
}
// exponential backoff if it's not our first attempt to dial given address
if attempts > 0 {
jitter := time.Duration(tmrand.Float64() * float64(time.Second)) // 1s == (1e9 ns)
backoffDuration := jitter + ((1 << uint(attempts)) * time.Second)
backoffDuration = r.maxBackoffDurationForPeer(addr, backoffDuration)
sinceLastDialed := time.Since(lastDialed)
if sinceLastDialed < backoffDuration {
return errTooEarlyToDial{backoffDuration, lastDialed}
}
}
err := r.Switch.DialPeerWithAddress(addr)
if err != nil {
if _, ok := err.(p2p.ErrCurrentlyDialingOrExistingAddress); ok {
return err
}
markAddrInBookBasedOnErr(addr, r.book, err)
switch err.(type) {
case p2p.ErrSwitchAuthenticationFailure:
// NOTE: addr is removed from addrbook in markAddrInBookBasedOnErr
r.attemptsToDial.Delete(addr.DialString())
default:
r.attemptsToDial.Store(addr.DialString(), _attemptsToDial{attempts + 1, time.Now()})
}
return fmt.Errorf("dialing failed (attempts: %d): %w", attempts+1, err)
}
// cleanup any history
r.attemptsToDial.Delete(addr.DialString())
return nil
}
// maxBackoffDurationForPeer caps the backoff duration for persistent peers.
func (r *Reactor) maxBackoffDurationForPeer(addr *p2p.NetAddress, planned time.Duration) time.Duration {
if r.config.PersistentPeersMaxDialPeriod > 0 &&
planned > r.config.PersistentPeersMaxDialPeriod &&
r.Switch.IsPeerPersistent(addr) {
return r.config.PersistentPeersMaxDialPeriod
}
return planned
}
// checkSeeds checks that addresses are well formed.
// Returns number of seeds we can connect to, along with all seeds addrs.
// return err if user provided any badly formatted seed addresses.
// Doesn't error if the seed node can't be reached.
// numOnline returns -1 if no seed nodes were in the initial configuration.
func (r *Reactor) checkSeeds() (numOnline int, netAddrs []*p2p.NetAddress, err error) {
lSeeds := len(r.config.Seeds)
if lSeeds == 0 {
return -1, nil, nil
}
netAddrs, errs := p2p.NewNetAddressStrings(r.config.Seeds)
numOnline = lSeeds - len(errs)
for _, err := range errs {
switch e := err.(type) {
case p2p.ErrNetAddressLookup:
r.Logger.Error("Connecting to seed failed", "err", e)
default:
return 0, nil, fmt.Errorf("seed node configuration has error: %w", e)
}
}
return numOnline, netAddrs, nil
}
// randomly dial seeds until we connect to one or exhaust them
func (r *Reactor) dialSeeds() {
perm := tmrand.Perm(len(r.seedAddrs))
// perm := r.Switch.rng.Perm(lSeeds)
for _, i := range perm {
// dial a random seed
seedAddr := r.seedAddrs[i]
err := r.Switch.DialPeerWithAddress(seedAddr)
switch err.(type) {
case nil, p2p.ErrCurrentlyDialingOrExistingAddress:
return
}
r.Switch.Logger.Error("Error dialing seed", "err", err, "seed", seedAddr)
}
// do not write error message if there were no seeds specified in config
if len(r.seedAddrs) > 0 {
r.Switch.Logger.Error("Couldn't connect to any seeds")
}
}
// AttemptsToDial returns the number of attempts to dial specific address. It
// returns 0 if never attempted or successfully connected.
func (r *Reactor) AttemptsToDial(addr *p2p.NetAddress) int {
lAttempts, attempted := r.attemptsToDial.Load(addr.DialString())
if attempted {
return lAttempts.(_attemptsToDial).number
}
return 0
}
//----------------------------------------------------------
// Explores the network searching for more peers. (continuous)
// Seed/Crawler Mode causes this node to quickly disconnect
// from peers, except other seed nodes.
func (r *Reactor) crawlPeersRoutine() {
// If we have any seed nodes, consult them first
if len(r.seedAddrs) > 0 {
r.dialSeeds()
} else {
// Do an initial crawl
r.crawlPeers(r.book.GetSelection())
}
// Fire periodically
ticker := time.NewTicker(crawlPeerPeriod)
for {
select {
case <-ticker.C:
r.attemptDisconnects()
r.crawlPeers(r.book.GetSelection())
r.cleanupCrawlPeerInfos()
case <-r.Quit():
return
}
}
}
// nodeHasSomePeersOrDialingAny returns true if the node is connected to some
// peers or dialing them currently.
func (r *Reactor) nodeHasSomePeersOrDialingAny() bool {
out, in, dial := r.Switch.NumPeers()
return out+in+dial > 0
}
// crawlPeerInfo handles temporary data needed for the network crawling
// performed during seed/crawler mode.
type crawlPeerInfo struct {
Addr *p2p.NetAddress `json:"addr"`
// The last time we crawled the peer or attempted to do so.
LastCrawled time.Time `json:"last_crawled"`
}
// crawlPeers will crawl the network looking for new peer addresses.
func (r *Reactor) crawlPeers(addrs []*p2p.NetAddress) {
now := time.Now()
for _, addr := range addrs {
peerInfo, ok := r.crawlPeerInfos[addr.ID]
// Do not attempt to connect with peers we recently crawled.
if ok && now.Sub(peerInfo.LastCrawled) < minTimeBetweenCrawls {
continue
}
// Record crawling attempt.
r.crawlPeerInfos[addr.ID] = crawlPeerInfo{
Addr: addr,
LastCrawled: now,
}
err := r.dialPeer(addr)
if err != nil {
switch err.(type) {
case errMaxAttemptsToDial, errTooEarlyToDial, p2p.ErrCurrentlyDialingOrExistingAddress:
r.Logger.Debug(err.Error(), "addr", addr)
default:
r.Logger.Error(err.Error(), "addr", addr)
}
continue
}
peer := r.Switch.Peers().Get(addr.ID)
if peer != nil {
r.RequestAddrs(peer)
}
}
}
func (r *Reactor) cleanupCrawlPeerInfos() {
for id, info := range r.crawlPeerInfos {
// If we did not crawl a peer for 24 hours, it means the peer was removed
// from the addrbook => remove
//
// 10000 addresses / maxGetSelection = 40 cycles to get all addresses in
// the ideal case,
// 40 * crawlPeerPeriod ~ 20 minutes
if time.Since(info.LastCrawled) > 24*time.Hour {
delete(r.crawlPeerInfos, id)
}
}
}
// attemptDisconnects checks if we've been with each peer long enough to disconnect
func (r *Reactor) attemptDisconnects() {
for _, peer := range r.Switch.Peers().List() {
if peer.Status().Duration < r.config.SeedDisconnectWaitPeriod {
continue
}
if peer.IsPersistent() {
continue
}
r.Switch.StopPeerGracefully(peer)
}
}
func markAddrInBookBasedOnErr(addr *p2p.NetAddress, book AddrBook, err error) {
// TODO: detect more "bad peer" scenarios
switch err.(type) {
case p2p.ErrSwitchAuthenticationFailure:
book.MarkBad(addr, defaultBanTime)
default:
book.MarkAttempt(addr)
}
}
//-----------------------------------------------------------------------------
// Messages
// mustEncode proto encodes a tmp2p.Message
func mustEncode(pb proto.Message) []byte {
msg := tmp2p.Message{}
switch pb := pb.(type) {
case *tmp2p.PexRequest:
msg.Sum = &tmp2p.Message_PexRequest{PexRequest: pb}
case *tmp2p.PexAddrs:
msg.Sum = &tmp2p.Message_PexAddrs{PexAddrs: pb}
default:
panic(fmt.Sprintf("Unknown message type %T", pb))
}
bz, err := msg.Marshal()
if err != nil {
panic(fmt.Errorf("unable to marshal %T: %w", pb, err))
}
return bz
}
func decodeMsg(bz []byte) (proto.Message, error) {
pb := &tmp2p.Message{}
err := pb.Unmarshal(bz)
if err != nil {
return nil, err
}
switch msg := pb.Sum.(type) {
case *tmp2p.Message_PexRequest:
return msg.PexRequest, nil
case *tmp2p.Message_PexAddrs:
return msg.PexAddrs, nil
default:
return nil, fmt.Errorf("unknown message: %T", msg)
}
}