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.
573 lines
14 KiB
573 lines
14 KiB
package p2p
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math/rand"
|
|
"net"
|
|
"time"
|
|
|
|
crypto "github.com/tendermint/go-crypto"
|
|
"github.com/tendermint/log15"
|
|
cfg "github.com/tendermint/tendermint/config"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
const (
|
|
reconnectAttempts = 30
|
|
reconnectInterval = 3 * time.Second
|
|
)
|
|
|
|
type Reactor interface {
|
|
cmn.Service // Start, Stop
|
|
|
|
SetSwitch(*Switch)
|
|
GetChannels() []*ChannelDescriptor
|
|
AddPeer(peer *Peer)
|
|
RemovePeer(peer *Peer, reason interface{})
|
|
Receive(chID byte, peer *Peer, msgBytes []byte)
|
|
}
|
|
|
|
//--------------------------------------
|
|
|
|
type BaseReactor struct {
|
|
cmn.BaseService // Provides Start, Stop, .Quit
|
|
Switch *Switch
|
|
}
|
|
|
|
func NewBaseReactor(log log15.Logger, name string, impl Reactor) *BaseReactor {
|
|
return &BaseReactor{
|
|
BaseService: *cmn.NewBaseService(log, name, impl),
|
|
Switch: nil,
|
|
}
|
|
}
|
|
|
|
func (br *BaseReactor) SetSwitch(sw *Switch) {
|
|
br.Switch = sw
|
|
}
|
|
func (_ *BaseReactor) GetChannels() []*ChannelDescriptor { return nil }
|
|
func (_ *BaseReactor) AddPeer(peer *Peer) {}
|
|
func (_ *BaseReactor) RemovePeer(peer *Peer, reason interface{}) {}
|
|
func (_ *BaseReactor) Receive(chID byte, peer *Peer, msgBytes []byte) {}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
/*
|
|
The `Switch` handles peer connections and exposes an API to receive incoming messages
|
|
on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
|
|
or more `Channels`. So while sending outgoing messages is typically performed on the peer,
|
|
incoming messages are received on the reactor.
|
|
*/
|
|
type Switch struct {
|
|
cmn.BaseService
|
|
|
|
config *cfg.P2PConfig
|
|
peerConfig *PeerConfig
|
|
listeners []Listener
|
|
reactors map[string]Reactor
|
|
chDescs []*ChannelDescriptor
|
|
reactorsByCh map[byte]Reactor
|
|
peers *PeerSet
|
|
dialing *cmn.CMap
|
|
nodeInfo *NodeInfo // our node info
|
|
nodePrivKey crypto.PrivKeyEd25519 // our node privkey
|
|
|
|
filterConnByAddr func(net.Addr) error
|
|
filterConnByPubKey func(crypto.PubKeyEd25519) error
|
|
}
|
|
|
|
var (
|
|
ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
|
|
ErrSwitchMaxPeersPerIPRange = errors.New("IP range has too many peers")
|
|
)
|
|
|
|
func NewSwitch(config *cfg.P2PConfig) *Switch {
|
|
sw := &Switch{
|
|
config: config,
|
|
peerConfig: DefaultPeerConfig(),
|
|
reactors: make(map[string]Reactor),
|
|
chDescs: make([]*ChannelDescriptor, 0),
|
|
reactorsByCh: make(map[byte]Reactor),
|
|
peers: NewPeerSet(),
|
|
dialing: cmn.NewCMap(),
|
|
nodeInfo: nil,
|
|
}
|
|
sw.BaseService = *cmn.NewBaseService(log, "P2P Switch", sw)
|
|
return sw
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
|
|
// Validate the reactor.
|
|
// No two reactors can share the same channel.
|
|
reactorChannels := reactor.GetChannels()
|
|
for _, chDesc := range reactorChannels {
|
|
chID := chDesc.ID
|
|
if sw.reactorsByCh[chID] != nil {
|
|
cmn.PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
|
|
}
|
|
sw.chDescs = append(sw.chDescs, chDesc)
|
|
sw.reactorsByCh[chID] = reactor
|
|
}
|
|
sw.reactors[name] = reactor
|
|
reactor.SetSwitch(sw)
|
|
return reactor
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) Reactors() map[string]Reactor {
|
|
return sw.reactors
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) Reactor(name string) Reactor {
|
|
return sw.reactors[name]
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) AddListener(l Listener) {
|
|
sw.listeners = append(sw.listeners, l)
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) Listeners() []Listener {
|
|
return sw.listeners
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) IsListening() bool {
|
|
return len(sw.listeners) > 0
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo) {
|
|
sw.nodeInfo = nodeInfo
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) NodeInfo() *NodeInfo {
|
|
return sw.nodeInfo
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
// NOTE: Overwrites sw.nodeInfo.PubKey
|
|
func (sw *Switch) SetNodePrivKey(nodePrivKey crypto.PrivKeyEd25519) {
|
|
sw.nodePrivKey = nodePrivKey
|
|
if sw.nodeInfo != nil {
|
|
sw.nodeInfo.PubKey = nodePrivKey.PubKey().Unwrap().(crypto.PubKeyEd25519)
|
|
}
|
|
}
|
|
|
|
// Switch.Start() starts all the reactors, peers, and listeners.
|
|
func (sw *Switch) OnStart() error {
|
|
sw.BaseService.OnStart()
|
|
// Start reactors
|
|
for _, reactor := range sw.reactors {
|
|
_, err := reactor.Start()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
// Start peers
|
|
for _, peer := range sw.peers.List() {
|
|
sw.startInitPeer(peer)
|
|
}
|
|
// Start listeners
|
|
for _, listener := range sw.listeners {
|
|
go sw.listenerRoutine(listener)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) OnStop() {
|
|
sw.BaseService.OnStop()
|
|
// Stop listeners
|
|
for _, listener := range sw.listeners {
|
|
listener.Stop()
|
|
}
|
|
sw.listeners = nil
|
|
// Stop peers
|
|
for _, peer := range sw.peers.List() {
|
|
peer.Stop()
|
|
sw.peers.Remove(peer)
|
|
}
|
|
// Stop reactors
|
|
for _, reactor := range sw.reactors {
|
|
reactor.Stop()
|
|
}
|
|
}
|
|
|
|
// NOTE: This performs a blocking handshake before the peer is added.
|
|
// CONTRACT: If error is returned, peer is nil, and conn is immediately closed.
|
|
func (sw *Switch) AddPeer(peer *Peer) error {
|
|
if err := sw.FilterConnByAddr(peer.Addr()); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := sw.FilterConnByPubKey(peer.PubKey()); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := peer.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second)); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Avoid self
|
|
if sw.nodeInfo.PubKey.Equals(peer.PubKey().Wrap()) {
|
|
return errors.New("Ignoring connection from self")
|
|
}
|
|
|
|
// Check version, chain id
|
|
if err := sw.nodeInfo.CompatibleWith(peer.NodeInfo); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Add the peer to .peers
|
|
// ignore if duplicate or if we already have too many for that IP range
|
|
if err := sw.peers.Add(peer); err != nil {
|
|
log.Notice("Ignoring peer", "error", err, "peer", peer)
|
|
peer.Stop()
|
|
return err
|
|
}
|
|
|
|
// Start peer
|
|
if sw.IsRunning() {
|
|
sw.startInitPeer(peer)
|
|
}
|
|
|
|
log.Notice("Added peer", "peer", peer)
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) FilterConnByAddr(addr net.Addr) error {
|
|
if sw.filterConnByAddr != nil {
|
|
return sw.filterConnByAddr(addr)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) FilterConnByPubKey(pubkey crypto.PubKeyEd25519) error {
|
|
if sw.filterConnByPubKey != nil {
|
|
return sw.filterConnByPubKey(pubkey)
|
|
}
|
|
return nil
|
|
|
|
}
|
|
|
|
func (sw *Switch) SetAddrFilter(f func(net.Addr) error) {
|
|
sw.filterConnByAddr = f
|
|
}
|
|
|
|
func (sw *Switch) SetPubKeyFilter(f func(crypto.PubKeyEd25519) error) {
|
|
sw.filterConnByPubKey = f
|
|
}
|
|
|
|
func (sw *Switch) startInitPeer(peer *Peer) {
|
|
peer.Start() // spawn send/recv routines
|
|
for _, reactor := range sw.reactors {
|
|
reactor.AddPeer(peer)
|
|
}
|
|
}
|
|
|
|
// Dial a list of seeds asynchronously in random order
|
|
func (sw *Switch) DialSeeds(addrBook *AddrBook, seeds []string) error {
|
|
|
|
netAddrs, err := NewNetAddressStrings(seeds)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if addrBook != nil {
|
|
// add seeds to `addrBook`
|
|
ourAddrS := sw.nodeInfo.ListenAddr
|
|
ourAddr, _ := NewNetAddressString(ourAddrS)
|
|
for _, netAddr := range netAddrs {
|
|
// do not add ourselves
|
|
if netAddr.Equals(ourAddr) {
|
|
continue
|
|
}
|
|
addrBook.AddAddress(netAddr, ourAddr)
|
|
}
|
|
addrBook.Save()
|
|
}
|
|
|
|
// permute the list, dial them in random order.
|
|
perm := rand.Perm(len(netAddrs))
|
|
for i := 0; i < len(perm); i++ {
|
|
go func(i int) {
|
|
time.Sleep(time.Duration(rand.Int63n(3000)) * time.Millisecond)
|
|
j := perm[i]
|
|
sw.dialSeed(netAddrs[j])
|
|
}(i)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) dialSeed(addr *NetAddress) {
|
|
peer, err := sw.DialPeerWithAddress(addr, true)
|
|
if err != nil {
|
|
log.Error("Error dialing seed", "error", err)
|
|
return
|
|
} else {
|
|
log.Notice("Connected to seed", "peer", peer)
|
|
}
|
|
}
|
|
|
|
func (sw *Switch) DialPeerWithAddress(addr *NetAddress, persistent bool) (*Peer, error) {
|
|
sw.dialing.Set(addr.IP.String(), addr)
|
|
defer sw.dialing.Delete(addr.IP.String())
|
|
|
|
peer, err := newOutboundPeerWithConfig(addr, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, sw.peerConfig)
|
|
if err != nil {
|
|
log.Info("Failed dialing peer", "address", addr, "error", err)
|
|
return nil, err
|
|
}
|
|
if persistent {
|
|
peer.makePersistent()
|
|
}
|
|
err = sw.AddPeer(peer)
|
|
if err != nil {
|
|
log.Info("Failed adding peer", "address", addr, "error", err)
|
|
peer.CloseConn()
|
|
return nil, err
|
|
}
|
|
log.Notice("Dialed and added peer", "address", addr, "peer", peer)
|
|
return peer, nil
|
|
}
|
|
|
|
func (sw *Switch) IsDialing(addr *NetAddress) bool {
|
|
return sw.dialing.Has(addr.IP.String())
|
|
}
|
|
|
|
// Broadcast runs a go routine for each attempted send, which will block
|
|
// trying to send for defaultSendTimeoutSeconds. Returns a channel
|
|
// which receives success values for each attempted send (false if times out)
|
|
// NOTE: Broadcast uses goroutines, so order of broadcast may not be preserved.
|
|
func (sw *Switch) Broadcast(chID byte, msg interface{}) chan bool {
|
|
successChan := make(chan bool, len(sw.peers.List()))
|
|
log.Debug("Broadcast", "channel", chID, "msg", msg)
|
|
for _, peer := range sw.peers.List() {
|
|
go func(peer *Peer) {
|
|
success := peer.Send(chID, msg)
|
|
successChan <- success
|
|
}(peer)
|
|
}
|
|
return successChan
|
|
}
|
|
|
|
// Returns the count of outbound/inbound and outbound-dialing peers.
|
|
func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
|
|
peers := sw.peers.List()
|
|
for _, peer := range peers {
|
|
if peer.outbound {
|
|
outbound++
|
|
} else {
|
|
inbound++
|
|
}
|
|
}
|
|
dialing = sw.dialing.Size()
|
|
return
|
|
}
|
|
|
|
func (sw *Switch) Peers() IPeerSet {
|
|
return sw.peers
|
|
}
|
|
|
|
// Disconnect from a peer due to external error, retry if it is a persistent peer.
|
|
// TODO: make record depending on reason.
|
|
func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
|
|
addr := NewNetAddress(peer.Addr())
|
|
log.Notice("Stopping peer for error", "peer", peer, "error", reason)
|
|
sw.stopAndRemovePeer(peer, reason)
|
|
|
|
if peer.IsPersistent() {
|
|
go func() {
|
|
log.Notice("Reconnecting to peer", "peer", peer)
|
|
for i := 1; i < reconnectAttempts; i++ {
|
|
if !sw.IsRunning() {
|
|
return
|
|
}
|
|
|
|
peer, err := sw.DialPeerWithAddress(addr, true)
|
|
if err != nil {
|
|
if i == reconnectAttempts {
|
|
log.Notice("Error reconnecting to peer. Giving up", "tries", i, "error", err)
|
|
return
|
|
}
|
|
log.Notice("Error reconnecting to peer. Trying again", "tries", i, "error", err)
|
|
time.Sleep(reconnectInterval)
|
|
continue
|
|
}
|
|
|
|
log.Notice("Reconnected to peer", "peer", peer)
|
|
return
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
// Disconnect from a peer gracefully.
|
|
// TODO: handle graceful disconnects.
|
|
func (sw *Switch) StopPeerGracefully(peer *Peer) {
|
|
log.Notice("Stopping peer gracefully")
|
|
sw.stopAndRemovePeer(peer, nil)
|
|
}
|
|
|
|
func (sw *Switch) stopAndRemovePeer(peer *Peer, reason interface{}) {
|
|
sw.peers.Remove(peer)
|
|
peer.Stop()
|
|
for _, reactor := range sw.reactors {
|
|
reactor.RemovePeer(peer, reason)
|
|
}
|
|
}
|
|
|
|
func (sw *Switch) listenerRoutine(l Listener) {
|
|
for {
|
|
inConn, ok := <-l.Connections()
|
|
if !ok {
|
|
break
|
|
}
|
|
|
|
// ignore connection if we already have enough
|
|
maxPeers := sw.config.MaxNumPeers
|
|
if maxPeers <= sw.peers.Size() {
|
|
log.Info("Ignoring inbound connection: already have enough peers", "address", inConn.RemoteAddr().String(), "numPeers", sw.peers.Size(), "max", maxPeers)
|
|
continue
|
|
}
|
|
|
|
// New inbound connection!
|
|
err := sw.addPeerWithConnectionAndConfig(inConn, sw.peerConfig)
|
|
if err != nil {
|
|
log.Notice("Ignoring inbound connection: error while adding peer", "address", inConn.RemoteAddr().String(), "error", err)
|
|
continue
|
|
}
|
|
|
|
// NOTE: We don't yet have the listening port of the
|
|
// remote (if they have a listener at all).
|
|
// The peerHandshake will handle that
|
|
}
|
|
|
|
// cleanup
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
type SwitchEventNewPeer struct {
|
|
Peer *Peer
|
|
}
|
|
|
|
type SwitchEventDonePeer struct {
|
|
Peer *Peer
|
|
Error interface{}
|
|
}
|
|
|
|
//------------------------------------------------------------------
|
|
// Switches connected via arbitrary net.Conn; useful for testing
|
|
|
|
// Returns n switches, connected according to the connect func.
|
|
// If connect==Connect2Switches, the switches will be fully connected.
|
|
// initSwitch defines how the ith switch should be initialized (ie. with what reactors).
|
|
// NOTE: panics if any switch fails to start.
|
|
func MakeConnectedSwitches(cfg *cfg.P2PConfig, n int, initSwitch func(int, *Switch) *Switch, connect func([]*Switch, int, int)) []*Switch {
|
|
switches := make([]*Switch, n)
|
|
for i := 0; i < n; i++ {
|
|
switches[i] = makeSwitch(cfg, i, "testing", "123.123.123", initSwitch)
|
|
}
|
|
|
|
if err := StartSwitches(switches); err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
for i := 0; i < n; i++ {
|
|
for j := i; j < n; j++ {
|
|
connect(switches, i, j)
|
|
}
|
|
}
|
|
|
|
return switches
|
|
}
|
|
|
|
var PanicOnAddPeerErr = false
|
|
|
|
// Will connect switches i and j via net.Pipe()
|
|
// Blocks until a conection is established.
|
|
// NOTE: caller ensures i and j are within bounds
|
|
func Connect2Switches(switches []*Switch, i, j int) {
|
|
switchI := switches[i]
|
|
switchJ := switches[j]
|
|
c1, c2 := net.Pipe()
|
|
doneCh := make(chan struct{})
|
|
go func() {
|
|
err := switchI.addPeerWithConnection(c1)
|
|
if PanicOnAddPeerErr && err != nil {
|
|
panic(err)
|
|
}
|
|
doneCh <- struct{}{}
|
|
}()
|
|
go func() {
|
|
err := switchJ.addPeerWithConnection(c2)
|
|
if PanicOnAddPeerErr && err != nil {
|
|
panic(err)
|
|
}
|
|
doneCh <- struct{}{}
|
|
}()
|
|
<-doneCh
|
|
<-doneCh
|
|
}
|
|
|
|
func StartSwitches(switches []*Switch) error {
|
|
for _, s := range switches {
|
|
_, err := s.Start() // start switch and reactors
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func makeSwitch(cfg *cfg.P2PConfig, i int, network, version string, initSwitch func(int, *Switch) *Switch) *Switch {
|
|
privKey := crypto.GenPrivKeyEd25519()
|
|
// new switch, add reactors
|
|
// TODO: let the config be passed in?
|
|
s := initSwitch(i, NewSwitch(cfg))
|
|
s.SetNodeInfo(&NodeInfo{
|
|
PubKey: privKey.PubKey().Unwrap().(crypto.PubKeyEd25519),
|
|
Moniker: cmn.Fmt("switch%d", i),
|
|
Network: network,
|
|
Version: version,
|
|
RemoteAddr: cmn.Fmt("%v:%v", network, rand.Intn(64512)+1023),
|
|
ListenAddr: cmn.Fmt("%v:%v", network, rand.Intn(64512)+1023),
|
|
})
|
|
s.SetNodePrivKey(privKey)
|
|
return s
|
|
}
|
|
|
|
func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
|
|
peer, err := newInboundPeer(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey)
|
|
if err != nil {
|
|
conn.Close()
|
|
return err
|
|
}
|
|
|
|
if err = sw.AddPeer(peer); err != nil {
|
|
conn.Close()
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) addPeerWithConnectionAndConfig(conn net.Conn, config *PeerConfig) error {
|
|
peer, err := newInboundPeerWithConfig(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, config)
|
|
if err != nil {
|
|
conn.Close()
|
|
return err
|
|
}
|
|
|
|
if err = sw.AddPeer(peer); err != nil {
|
|
conn.Close()
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|