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.
389 lines
10 KiB
389 lines
10 KiB
package p2p
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"strconv"
|
|
"time"
|
|
|
|
"github.com/tendermint/tendermint/Godeps/_workspace/src/github.com/tendermint/log15"
|
|
acm "github.com/tendermint/tendermint/account"
|
|
. "github.com/tendermint/tendermint/common"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
type Reactor interface {
|
|
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 {
|
|
QuitService // Provides Start, Stop, .Quit
|
|
Switch *Switch
|
|
}
|
|
|
|
func NewBaseReactor(log log15.Logger, name string, impl Reactor) *BaseReactor {
|
|
return &BaseReactor{
|
|
QuitService: *NewQuitService(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 {
|
|
BaseService
|
|
|
|
listeners []Listener
|
|
reactors map[string]Reactor
|
|
chDescs []*ChannelDescriptor
|
|
reactorsByCh map[byte]Reactor
|
|
peers *PeerSet
|
|
dialing *CMap
|
|
nodeInfo *types.NodeInfo // our node info
|
|
nodePrivKey acm.PrivKeyEd25519 // our node privkey
|
|
}
|
|
|
|
var (
|
|
ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
|
|
ErrSwitchMaxPeersPerIPRange = errors.New("IP range has too many peers")
|
|
)
|
|
|
|
const (
|
|
peerDialTimeoutSeconds = 3 // TODO make this configurable
|
|
handshakeTimeoutSeconds = 20 // TODO make this configurable
|
|
maxNumPeers = 50 // TODO make this configurable
|
|
)
|
|
|
|
func NewSwitch() *Switch {
|
|
sw := &Switch{
|
|
reactors: make(map[string]Reactor),
|
|
chDescs: make([]*ChannelDescriptor, 0),
|
|
reactorsByCh: make(map[byte]Reactor),
|
|
peers: NewPeerSet(),
|
|
dialing: NewCMap(),
|
|
nodeInfo: nil,
|
|
}
|
|
sw.BaseService = *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 {
|
|
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 *types.NodeInfo) {
|
|
sw.nodeInfo = nodeInfo
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
func (sw *Switch) NodeInfo() *types.NodeInfo {
|
|
return sw.nodeInfo
|
|
}
|
|
|
|
// Not goroutine safe.
|
|
// NOTE: Overwrites sw.nodeInfo.PubKey
|
|
func (sw *Switch) SetNodePrivKey(nodePrivKey acm.PrivKeyEd25519) {
|
|
sw.nodePrivKey = nodePrivKey
|
|
if sw.nodeInfo != nil {
|
|
sw.nodeInfo.PubKey = nodePrivKey.PubKey().(acm.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 {
|
|
reactor.Start()
|
|
}
|
|
// 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 = NewPeerSet()
|
|
// Stop reactors
|
|
for _, reactor := range sw.reactors {
|
|
reactor.Stop()
|
|
}
|
|
}
|
|
|
|
// NOTE: This performs a blocking handshake before the peer is added.
|
|
// CONTRACT: Iff error is returned, peer is nil, and conn is immediately closed.
|
|
func (sw *Switch) AddPeerWithConnection(conn net.Conn, outbound bool) (*Peer, error) {
|
|
// Set deadline for handshake so we don't block forever on conn.ReadFull
|
|
conn.SetDeadline(time.Now().Add(handshakeTimeoutSeconds * time.Second))
|
|
|
|
// First, encrypt the connection.
|
|
sconn, err := MakeSecretConnection(conn, sw.nodePrivKey)
|
|
if err != nil {
|
|
conn.Close()
|
|
return nil, err
|
|
}
|
|
// Then, perform node handshake
|
|
peerNodeInfo, err := peerHandshake(sconn, sw.nodeInfo)
|
|
if err != nil {
|
|
sconn.Close()
|
|
return nil, err
|
|
}
|
|
// Check that the professed PubKey matches the sconn's.
|
|
if !peerNodeInfo.PubKey.Equals(sconn.RemotePubKey()) {
|
|
sconn.Close()
|
|
return nil, fmt.Errorf("Ignoring connection with unmatching pubkey: %v vs %v",
|
|
peerNodeInfo.PubKey, sconn.RemotePubKey())
|
|
}
|
|
// Avoid self
|
|
if peerNodeInfo.PubKey.Equals(sw.nodeInfo.PubKey) {
|
|
sconn.Close()
|
|
return nil, fmt.Errorf("Ignoring connection from self")
|
|
}
|
|
// Check version, chain id
|
|
if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
|
|
sconn.Close()
|
|
return nil, err
|
|
}
|
|
|
|
// The peerNodeInfo is not verified, so overwrite
|
|
// the IP, and the port too if we dialed out
|
|
// Everything else we just have to trust
|
|
ip, port, _ := net.SplitHostPort(sconn.RemoteAddr().String())
|
|
peerNodeInfo.Host = ip
|
|
if outbound {
|
|
porti, _ := strconv.Atoi(port)
|
|
peerNodeInfo.P2PPort = uint16(porti)
|
|
}
|
|
peer := newPeer(sconn, peerNodeInfo, outbound, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
|
|
|
|
// 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 nil, err
|
|
}
|
|
|
|
// remove deadline and start peer
|
|
conn.SetDeadline(time.Time{})
|
|
if sw.IsRunning() {
|
|
sw.startInitPeer(peer)
|
|
}
|
|
|
|
log.Notice("Added peer", "peer", peer)
|
|
return peer, nil
|
|
}
|
|
|
|
func (sw *Switch) startInitPeer(peer *Peer) {
|
|
peer.Start() // spawn send/recv routines
|
|
sw.addPeerToReactors(peer) // run AddPeer on each reactor
|
|
}
|
|
|
|
func (sw *Switch) DialPeerWithAddress(addr *NetAddress) (*Peer, error) {
|
|
log.Info("Dialing address", "address", addr)
|
|
sw.dialing.Set(addr.IP.String(), addr)
|
|
conn, err := addr.DialTimeout(peerDialTimeoutSeconds * time.Second)
|
|
sw.dialing.Delete(addr.IP.String())
|
|
if err != nil {
|
|
log.Info("Failed dialing address", "address", addr, "error", err)
|
|
return nil, err
|
|
}
|
|
peer, err := sw.AddPeerWithConnection(conn, true)
|
|
if err != nil {
|
|
log.Info("Failed adding peer", "address", addr, "conn", conn, "error", err)
|
|
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)
|
|
func (sw *Switch) Broadcast(chId byte, msg interface{}) chan bool {
|
|
successChan := make(chan bool, len(sw.peers.List()))
|
|
log.Info("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.
|
|
// TODO: make record depending on reason.
|
|
func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
|
|
log.Notice("Stopping peer for error", "peer", peer, "error", reason)
|
|
sw.peers.Remove(peer)
|
|
peer.Stop()
|
|
sw.removePeerFromReactors(peer, reason)
|
|
}
|
|
|
|
// Disconnect from a peer gracefully.
|
|
// TODO: handle graceful disconnects.
|
|
func (sw *Switch) StopPeerGracefully(peer *Peer) {
|
|
log.Notice("Stopping peer gracefully")
|
|
sw.peers.Remove(peer)
|
|
peer.Stop()
|
|
sw.removePeerFromReactors(peer, nil)
|
|
}
|
|
|
|
func (sw *Switch) addPeerToReactors(peer *Peer) {
|
|
for _, reactor := range sw.reactors {
|
|
reactor.AddPeer(peer)
|
|
}
|
|
}
|
|
|
|
func (sw *Switch) removePeerFromReactors(peer *Peer, reason interface{}) {
|
|
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
|
|
if maxNumPeers <= sw.peers.Size() {
|
|
log.Info("Ignoring inbound connection: already have enough peers", "address", inConn.RemoteAddr().String(), "numPeers", sw.peers.Size(), "max", maxNumPeers)
|
|
continue
|
|
}
|
|
|
|
// Ignore connections from IP ranges for which we have too many
|
|
if sw.peers.HasMaxForIPRange(inConn) {
|
|
log.Info("Ignoring inbound connection: already have enough peers for that IP range", "address", inConn.RemoteAddr().String())
|
|
continue
|
|
}
|
|
|
|
// New inbound connection!
|
|
_, err := sw.AddPeerWithConnection(inConn, false)
|
|
if err != nil {
|
|
log.Notice("Ignoring inbound connection: error on AddPeerWithConnection", "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{}
|
|
}
|