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411 lines
11 KiB
411 lines
11 KiB
package p2p
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import (
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"errors"
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"fmt"
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"math/rand"
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"net"
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"time"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-crypto"
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"github.com/tendermint/log15"
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)
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type Reactor interface {
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Service // Start, Stop
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SetSwitch(*Switch)
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GetChannels() []*ChannelDescriptor
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AddPeer(peer *Peer)
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RemovePeer(peer *Peer, reason interface{})
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Receive(chID byte, peer *Peer, msgBytes []byte)
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}
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//--------------------------------------
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type BaseReactor struct {
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QuitService // Provides Start, Stop, .Quit
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Switch *Switch
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}
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func NewBaseReactor(log log15.Logger, name string, impl Reactor) *BaseReactor {
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return &BaseReactor{
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QuitService: *NewQuitService(log, name, impl),
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Switch: nil,
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}
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}
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func (br *BaseReactor) SetSwitch(sw *Switch) {
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br.Switch = sw
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}
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func (_ *BaseReactor) GetChannels() []*ChannelDescriptor { return nil }
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func (_ *BaseReactor) AddPeer(peer *Peer) {}
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func (_ *BaseReactor) RemovePeer(peer *Peer, reason interface{}) {}
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func (_ *BaseReactor) Receive(chID byte, peer *Peer, msgBytes []byte) {}
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//-----------------------------------------------------------------------------
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/*
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The `Switch` handles peer connections and exposes an API to receive incoming messages
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on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
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or more `Channels`. So while sending outgoing messages is typically performed on the peer,
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incoming messages are received on the reactor.
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*/
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type Switch struct {
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BaseService
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listeners []Listener
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reactors map[string]Reactor
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chDescs []*ChannelDescriptor
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reactorsByCh map[byte]Reactor
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peers *PeerSet
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dialing *CMap
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nodeInfo *NodeInfo // our node info
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nodePrivKey crypto.PrivKeyEd25519 // our node privkey
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}
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var (
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ErrSwitchDuplicatePeer = errors.New("Duplicate peer")
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ErrSwitchMaxPeersPerIPRange = errors.New("IP range has too many peers")
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)
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// config keys
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const (
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dialTimeoutKey = "p2p_dial_timeout_seconds"
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handshakeTimeoutKey = "p2p_handshake_timeout_seconds"
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maxNumPeersKey = "p2p_max_num_peers"
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authEncKey = "p2p_authenticated_encryption"
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)
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func NewSwitch() *Switch {
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sw := &Switch{
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reactors: make(map[string]Reactor),
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chDescs: make([]*ChannelDescriptor, 0),
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reactorsByCh: make(map[byte]Reactor),
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peers: NewPeerSet(),
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dialing: NewCMap(),
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nodeInfo: nil,
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}
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sw.BaseService = *NewBaseService(log, "P2P Switch", sw)
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return sw
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}
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// Not goroutine safe.
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func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
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// Validate the reactor.
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// No two reactors can share the same channel.
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reactorChannels := reactor.GetChannels()
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for _, chDesc := range reactorChannels {
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chID := chDesc.ID
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if sw.reactorsByCh[chID] != nil {
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PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
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}
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sw.chDescs = append(sw.chDescs, chDesc)
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sw.reactorsByCh[chID] = reactor
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}
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sw.reactors[name] = reactor
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reactor.SetSwitch(sw)
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return reactor
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}
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// Not goroutine safe.
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func (sw *Switch) Reactors() map[string]Reactor {
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return sw.reactors
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}
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// Not goroutine safe.
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func (sw *Switch) Reactor(name string) Reactor {
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return sw.reactors[name]
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}
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// Not goroutine safe.
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func (sw *Switch) AddListener(l Listener) {
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sw.listeners = append(sw.listeners, l)
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}
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// Not goroutine safe.
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func (sw *Switch) Listeners() []Listener {
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return sw.listeners
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}
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// Not goroutine safe.
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func (sw *Switch) IsListening() bool {
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return len(sw.listeners) > 0
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}
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// Not goroutine safe.
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func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo) {
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sw.nodeInfo = nodeInfo
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}
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// Not goroutine safe.
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func (sw *Switch) NodeInfo() *NodeInfo {
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return sw.nodeInfo
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}
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// Not goroutine safe.
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// NOTE: Overwrites sw.nodeInfo.PubKey
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func (sw *Switch) SetNodePrivKey(nodePrivKey crypto.PrivKeyEd25519) {
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sw.nodePrivKey = nodePrivKey
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if sw.nodeInfo != nil {
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sw.nodeInfo.PubKey = nodePrivKey.PubKey().(crypto.PubKeyEd25519)
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}
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}
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// Switch.Start() starts all the reactors, peers, and listeners.
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func (sw *Switch) OnStart() error {
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sw.BaseService.OnStart()
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// Start reactors
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for _, reactor := range sw.reactors {
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_, err := reactor.Start()
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if err != nil {
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return err
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}
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}
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// Start peers
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for _, peer := range sw.peers.List() {
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sw.startInitPeer(peer)
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}
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// Start listeners
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for _, listener := range sw.listeners {
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go sw.listenerRoutine(listener)
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}
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return nil
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}
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func (sw *Switch) OnStop() {
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sw.BaseService.OnStop()
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// Stop listeners
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for _, listener := range sw.listeners {
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listener.Stop()
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}
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sw.listeners = nil
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// Stop peers
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for _, peer := range sw.peers.List() {
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peer.Stop()
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}
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sw.peers = NewPeerSet()
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// Stop reactors
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for _, reactor := range sw.reactors {
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reactor.Stop()
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}
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}
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// NOTE: This performs a blocking handshake before the peer is added.
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// CONTRACT: Iff error is returned, peer is nil, and conn is immediately closed.
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func (sw *Switch) AddPeerWithConnection(conn net.Conn, outbound bool) (*Peer, error) {
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// Set deadline for handshake so we don't block forever on conn.ReadFull
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conn.SetDeadline(time.Now().Add(time.Duration(config.GetInt(handshakeTimeoutKey)) * time.Second))
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// First, encrypt the connection.
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var sconn net.Conn = conn
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if config.GetBool(authEncKey) {
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var err error
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sconn, err = MakeSecretConnection(conn, sw.nodePrivKey)
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if err != nil {
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conn.Close()
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return nil, err
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}
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}
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// Then, perform node handshake
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peerNodeInfo, err := peerHandshake(sconn, sw.nodeInfo)
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if err != nil {
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sconn.Close()
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return nil, err
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}
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if config.GetBool("p2p_authenticated_encryption") {
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// Check that the professed PubKey matches the sconn's.
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if !peerNodeInfo.PubKey.Equals(sconn.(*SecretConnection).RemotePubKey()) {
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sconn.Close()
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return nil, fmt.Errorf("Ignoring connection with unmatching pubkey: %v vs %v",
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peerNodeInfo.PubKey, sconn.(*SecretConnection).RemotePubKey())
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}
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}
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// Avoid self
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if peerNodeInfo.PubKey.Equals(sw.nodeInfo.PubKey) {
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sconn.Close()
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return nil, fmt.Errorf("Ignoring connection from self")
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}
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// Check version, chain id
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if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
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sconn.Close()
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return nil, err
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}
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peer := newPeer(sconn, peerNodeInfo, outbound, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
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// Add the peer to .peers
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// ignore if duplicate or if we already have too many for that IP range
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if err := sw.peers.Add(peer); err != nil {
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log.Notice("Ignoring peer", "error", err, "peer", peer)
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peer.Stop()
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return nil, err
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}
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// remove deadline and start peer
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conn.SetDeadline(time.Time{})
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if sw.IsRunning() {
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sw.startInitPeer(peer)
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}
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log.Notice("Added peer", "peer", peer)
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return peer, nil
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}
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func (sw *Switch) startInitPeer(peer *Peer) {
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peer.Start() // spawn send/recv routines
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sw.addPeerToReactors(peer) // run AddPeer on each reactor
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}
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// Dial a list of seeds in random order
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// Spawns a go routine for each dial
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func (sw *Switch) DialSeeds(seeds []string) {
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// permute the list, dial them in random order.
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perm := rand.Perm(len(seeds))
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for i := 0; i < len(perm); i++ {
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go func(i int) {
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time.Sleep(time.Duration(rand.Int63n(3000)) * time.Millisecond)
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j := perm[i]
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addr := NewNetAddressString(seeds[j])
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sw.dialSeed(addr)
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}(i)
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}
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}
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func (sw *Switch) dialSeed(addr *NetAddress) {
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peer, err := sw.DialPeerWithAddress(addr)
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if err != nil {
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log.Error("Error dialing seed", "error", err)
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return
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} else {
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log.Notice("Connected to seed", "peer", peer)
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}
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}
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func (sw *Switch) DialPeerWithAddress(addr *NetAddress) (*Peer, error) {
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log.Info("Dialing address", "address", addr)
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sw.dialing.Set(addr.IP.String(), addr)
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conn, err := addr.DialTimeout(time.Duration(config.GetInt(dialTimeoutKey)) * time.Second)
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sw.dialing.Delete(addr.IP.String())
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if err != nil {
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log.Info("Failed dialing address", "address", addr, "error", err)
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return nil, err
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}
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peer, err := sw.AddPeerWithConnection(conn, true)
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if err != nil {
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log.Info("Failed adding peer", "address", addr, "conn", conn, "error", err)
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return nil, err
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}
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log.Notice("Dialed and added peer", "address", addr, "peer", peer)
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return peer, nil
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}
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func (sw *Switch) IsDialing(addr *NetAddress) bool {
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return sw.dialing.Has(addr.IP.String())
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}
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// Broadcast runs a go routine for each attempted send, which will block
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// trying to send for defaultSendTimeoutSeconds. Returns a channel
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// which receives success values for each attempted send (false if times out)
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// NOTE: Broadcast uses goroutines, so order of broadcast may not be preserved.
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func (sw *Switch) Broadcast(chID byte, msg interface{}) chan bool {
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successChan := make(chan bool, len(sw.peers.List()))
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log.Info("Broadcast", "channel", chID, "msg", msg)
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for _, peer := range sw.peers.List() {
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go func(peer *Peer) {
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success := peer.Send(chID, msg)
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successChan <- success
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}(peer)
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}
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return successChan
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}
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// Returns the count of outbound/inbound and outbound-dialing peers.
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func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
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peers := sw.peers.List()
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for _, peer := range peers {
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if peer.outbound {
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outbound++
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} else {
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inbound++
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}
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}
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dialing = sw.dialing.Size()
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return
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}
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func (sw *Switch) Peers() IPeerSet {
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return sw.peers
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}
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// Disconnect from a peer due to external error.
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// TODO: make record depending on reason.
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func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
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log.Notice("Stopping peer for error", "peer", peer, "error", reason)
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sw.peers.Remove(peer)
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peer.Stop()
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sw.removePeerFromReactors(peer, reason)
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}
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// Disconnect from a peer gracefully.
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// TODO: handle graceful disconnects.
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func (sw *Switch) StopPeerGracefully(peer *Peer) {
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log.Notice("Stopping peer gracefully")
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sw.peers.Remove(peer)
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peer.Stop()
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sw.removePeerFromReactors(peer, nil)
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}
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func (sw *Switch) addPeerToReactors(peer *Peer) {
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for _, reactor := range sw.reactors {
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reactor.AddPeer(peer)
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}
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}
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func (sw *Switch) removePeerFromReactors(peer *Peer, reason interface{}) {
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for _, reactor := range sw.reactors {
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reactor.RemovePeer(peer, reason)
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}
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}
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func (sw *Switch) listenerRoutine(l Listener) {
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for {
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inConn, ok := <-l.Connections()
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if !ok {
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break
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}
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// ignore connection if we already have enough
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maxPeers := config.GetInt(maxNumPeersKey)
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if maxPeers <= sw.peers.Size() {
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log.Info("Ignoring inbound connection: already have enough peers", "address", inConn.RemoteAddr().String(), "numPeers", sw.peers.Size(), "max", maxPeers)
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continue
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}
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// New inbound connection!
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_, err := sw.AddPeerWithConnection(inConn, false)
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if err != nil {
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log.Notice("Ignoring inbound connection: error on AddPeerWithConnection", "address", inConn.RemoteAddr().String(), "error", err)
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continue
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}
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// NOTE: We don't yet have the listening port of the
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// remote (if they have a listener at all).
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// The peerHandshake will handle that
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}
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// cleanup
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}
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//-----------------------------------------------------------------------------
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type SwitchEventNewPeer struct {
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Peer *Peer
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}
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type SwitchEventDonePeer struct {
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Peer *Peer
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Error interface{}
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}
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