You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
805 lines
22 KiB
805 lines
22 KiB
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.
|
|
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, "err", err)
|
|
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 {
|
|
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.Debug(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
|
|
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.Debug(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.Debug(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)
|
|
}
|
|
}
|