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667 lines
18 KiB
667 lines
18 KiB
package p2p
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import (
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"fmt"
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"math"
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"sync"
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"time"
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"github.com/tendermint/tendermint/config"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/p2p/conn"
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)
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const (
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// wait a random amount of time from this interval
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// before dialing peers or reconnecting to help prevent DoS
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dialRandomizerIntervalMilliseconds = 3000
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// repeatedly try to reconnect for a few minutes
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// ie. 5 * 20 = 100s
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reconnectAttempts = 20
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reconnectInterval = 5 * time.Second
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// then move into exponential backoff mode for ~1day
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// ie. 3**10 = 16hrs
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reconnectBackOffAttempts = 10
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reconnectBackOffBaseSeconds = 3
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)
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// MConnConfig returns an MConnConfig with fields updated
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// from the P2PConfig.
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func MConnConfig(cfg *config.P2PConfig) conn.MConnConfig {
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mConfig := conn.DefaultMConnConfig()
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mConfig.FlushThrottle = cfg.FlushThrottleTimeout
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mConfig.SendRate = cfg.SendRate
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mConfig.RecvRate = cfg.RecvRate
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mConfig.MaxPacketMsgPayloadSize = cfg.MaxPacketMsgPayloadSize
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return mConfig
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}
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//-----------------------------------------------------------------------------
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// An AddrBook represents an address book from the pex package, which is used
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// to store peer addresses.
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type AddrBook interface {
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AddAddress(addr *NetAddress, src *NetAddress) error
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AddOurAddress(*NetAddress)
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OurAddress(*NetAddress) bool
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MarkGood(*NetAddress)
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RemoveAddress(*NetAddress)
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HasAddress(*NetAddress) bool
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Save()
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}
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// PeerFilterFunc to be implemented by filter hooks after a new Peer has been
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// fully setup.
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type PeerFilterFunc func(IPeerSet, Peer) error
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//-----------------------------------------------------------------------------
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// 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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type Switch struct {
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cmn.BaseService
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config *config.P2PConfig
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reactors map[string]Reactor
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chDescs []*conn.ChannelDescriptor
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reactorsByCh map[byte]Reactor
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peers *PeerSet
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dialing *cmn.CMap
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reconnecting *cmn.CMap
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nodeInfo NodeInfo // our node info
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nodeKey *NodeKey // our node privkey
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addrBook AddrBook
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transport Transport
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filterTimeout time.Duration
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peerFilters []PeerFilterFunc
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rng *cmn.Rand // seed for randomizing dial times and orders
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metrics *Metrics
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}
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// SwitchOption sets an optional parameter on the Switch.
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type SwitchOption func(*Switch)
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// NewSwitch creates a new Switch with the given config.
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func NewSwitch(
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cfg *config.P2PConfig,
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transport Transport,
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options ...SwitchOption,
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) *Switch {
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sw := &Switch{
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config: cfg,
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reactors: make(map[string]Reactor),
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chDescs: make([]*conn.ChannelDescriptor, 0),
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reactorsByCh: make(map[byte]Reactor),
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peers: NewPeerSet(),
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dialing: cmn.NewCMap(),
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reconnecting: cmn.NewCMap(),
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metrics: NopMetrics(),
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transport: transport,
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filterTimeout: defaultFilterTimeout,
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}
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// Ensure we have a completely undeterministic PRNG.
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sw.rng = cmn.NewRand()
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sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
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for _, option := range options {
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option(sw)
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}
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return sw
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}
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// SwitchFilterTimeout sets the timeout used for peer filters.
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func SwitchFilterTimeout(timeout time.Duration) SwitchOption {
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return func(sw *Switch) { sw.filterTimeout = timeout }
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}
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// SwitchPeerFilters sets the filters for rejection of new peers.
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func SwitchPeerFilters(filters ...PeerFilterFunc) SwitchOption {
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return func(sw *Switch) { sw.peerFilters = filters }
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}
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// WithMetrics sets the metrics.
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func WithMetrics(metrics *Metrics) SwitchOption {
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return func(sw *Switch) { sw.metrics = metrics }
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}
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//---------------------------------------------------------------------
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// Switch setup
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// AddReactor adds the given reactor to the switch.
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// NOTE: 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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cmn.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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// Reactors returns a map of reactors registered on the switch.
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// NOTE: 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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// Reactor returns the reactor with the given name.
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// NOTE: 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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// SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes.
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// NOTE: 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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// NodeInfo returns the switch's NodeInfo.
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// NOTE: 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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// SetNodeKey sets the switch's private key for authenticated encryption.
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// NOTE: Not goroutine safe.
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func (sw *Switch) SetNodeKey(nodeKey *NodeKey) {
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sw.nodeKey = nodeKey
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}
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//---------------------------------------------------------------------
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// Service start/stop
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// OnStart implements BaseService. It starts all the reactors and peers.
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func (sw *Switch) OnStart() error {
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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 cmn.ErrorWrap(err, "failed to start %v", reactor)
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}
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}
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// Start accepting Peers.
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go sw.acceptRoutine()
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return nil
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}
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// OnStop implements BaseService. It stops all peers and reactors.
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func (sw *Switch) OnStop() {
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// Stop peers
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for _, p := range sw.peers.List() {
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p.Stop()
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sw.peers.Remove(p)
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}
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// Stop reactors
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sw.Logger.Debug("Switch: Stopping 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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//---------------------------------------------------------------------
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// Peers
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// Broadcast runs a go routine for each attempted send, which will block trying
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// to send for defaultSendTimeoutSeconds. Returns a channel which receives
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// success values for each attempted send (false if times out). Channel will be
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// closed once msg bytes are sent to all peers (or time out).
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//
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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, msgBytes []byte) chan bool {
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successChan := make(chan bool, len(sw.peers.List()))
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sw.Logger.Debug("Broadcast", "channel", chID, "msgBytes", fmt.Sprintf("%X", msgBytes))
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var wg sync.WaitGroup
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for _, peer := range sw.peers.List() {
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wg.Add(1)
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go func(peer Peer) {
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defer wg.Done()
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success := peer.Send(chID, msgBytes)
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successChan <- success
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}(peer)
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}
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go func() {
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wg.Wait()
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close(successChan)
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}()
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return successChan
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}
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// NumPeers 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.IsOutbound() {
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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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// MaxNumOutboundPeers returns a maximum number of outbound peers.
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func (sw *Switch) MaxNumOutboundPeers() int {
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return sw.config.MaxNumOutboundPeers
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}
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// Peers returns the set of peers that are connected to the switch.
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func (sw *Switch) Peers() IPeerSet {
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return sw.peers
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}
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// StopPeerForError disconnects from a peer due to external error.
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// If the peer is persistent, it will attempt to reconnect.
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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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sw.Logger.Error("Stopping peer for error", "peer", peer, "err", reason)
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sw.stopAndRemovePeer(peer, reason)
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if peer.IsPersistent() {
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addr := peer.OriginalAddr()
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if addr == nil {
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// FIXME: persistent peers can't be inbound right now.
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// self-reported address for inbound persistent peers
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addr = peer.NodeInfo().NetAddress()
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}
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go sw.reconnectToPeer(addr)
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}
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}
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// StopPeerGracefully disconnects 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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sw.Logger.Info("Stopping peer gracefully")
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sw.stopAndRemovePeer(peer, nil)
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}
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func (sw *Switch) stopAndRemovePeer(peer Peer, reason interface{}) {
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sw.peers.Remove(peer)
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sw.metrics.Peers.Add(float64(-1))
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peer.Stop()
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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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// reconnectToPeer tries to reconnect to the addr, first repeatedly
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// with a fixed interval, then with exponential backoff.
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// If no success after all that, it stops trying, and leaves it
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// to the PEX/Addrbook to find the peer with the addr again
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// NOTE: this will keep trying even if the handshake or auth fails.
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// TODO: be more explicit with error types so we only retry on certain failures
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// - ie. if we're getting ErrDuplicatePeer we can stop
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// because the addrbook got us the peer back already
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func (sw *Switch) reconnectToPeer(addr *NetAddress) {
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if sw.reconnecting.Has(string(addr.ID)) {
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return
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}
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sw.reconnecting.Set(string(addr.ID), addr)
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defer sw.reconnecting.Delete(string(addr.ID))
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start := time.Now()
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sw.Logger.Info("Reconnecting to peer", "addr", addr)
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for i := 0; i < reconnectAttempts; i++ {
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if !sw.IsRunning() {
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return
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}
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if sw.IsDialingOrExistingAddress(addr) {
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sw.Logger.Debug("Peer connection has been established or dialed while we waiting next try", "addr", addr)
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return
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}
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err := sw.DialPeerWithAddress(addr, true)
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if err == nil {
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return // success
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}
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sw.Logger.Info("Error reconnecting to peer. Trying again", "tries", i, "err", err, "addr", addr)
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// sleep a set amount
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sw.randomSleep(reconnectInterval)
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continue
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}
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sw.Logger.Error("Failed to reconnect to peer. Beginning exponential backoff",
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"addr", addr, "elapsed", time.Since(start))
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for i := 0; i < reconnectBackOffAttempts; i++ {
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if !sw.IsRunning() {
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return
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}
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// sleep an exponentially increasing amount
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sleepIntervalSeconds := math.Pow(reconnectBackOffBaseSeconds, float64(i))
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sw.randomSleep(time.Duration(sleepIntervalSeconds) * time.Second)
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err := sw.DialPeerWithAddress(addr, true)
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if err == nil {
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return // success
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}
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sw.Logger.Info("Error reconnecting to peer. Trying again", "tries", i, "err", err, "addr", addr)
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}
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sw.Logger.Error("Failed to reconnect to peer. Giving up", "addr", addr, "elapsed", time.Since(start))
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}
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// SetAddrBook allows to set address book on Switch.
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func (sw *Switch) SetAddrBook(addrBook AddrBook) {
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sw.addrBook = addrBook
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}
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// MarkPeerAsGood marks the given peer as good when it did something useful
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// like contributed to consensus.
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func (sw *Switch) MarkPeerAsGood(peer Peer) {
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if sw.addrBook != nil {
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sw.addrBook.MarkGood(peer.NodeInfo().NetAddress())
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}
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}
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//---------------------------------------------------------------------
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// Dialing
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// DialPeersAsync dials a list of peers asynchronously in random order (optionally, making them persistent).
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// Used to dial peers from config on startup or from unsafe-RPC (trusted sources).
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// TODO: remove addrBook arg since it's now set on the switch
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func (sw *Switch) DialPeersAsync(addrBook AddrBook, peers []string, persistent bool) error {
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netAddrs, errs := NewNetAddressStrings(peers)
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// only log errors, dial correct addresses
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for _, err := range errs {
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sw.Logger.Error("Error in peer's address", "err", err)
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}
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ourAddr := sw.nodeInfo.NetAddress()
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// TODO: this code feels like it's in the wrong place.
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// The integration tests depend on the addrBook being saved
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// right away but maybe we can change that. Recall that
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// the addrBook is only written to disk every 2min
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if addrBook != nil {
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// add peers to `addrBook`
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for _, netAddr := range netAddrs {
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// do not add our address or ID
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if !netAddr.Same(ourAddr) {
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if err := addrBook.AddAddress(netAddr, ourAddr); err != nil {
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sw.Logger.Error("Can't add peer's address to addrbook", "err", err)
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}
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}
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}
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// Persist some peers to disk right away.
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// NOTE: integration tests depend on this
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addrBook.Save()
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}
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// permute the list, dial them in random order.
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perm := sw.rng.Perm(len(netAddrs))
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for i := 0; i < len(perm); i++ {
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go func(i int) {
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j := perm[i]
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addr := netAddrs[j]
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if addr.Same(ourAddr) {
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sw.Logger.Debug("Ignore attempt to connect to ourselves", "addr", addr, "ourAddr", ourAddr)
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return
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}
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sw.randomSleep(0)
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if sw.IsDialingOrExistingAddress(addr) {
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sw.Logger.Debug("Ignore attempt to connect to an existing peer", "addr", addr)
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return
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}
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err := sw.DialPeerWithAddress(addr, persistent)
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if err != nil {
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switch err.(type) {
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case ErrSwitchConnectToSelf, ErrSwitchDuplicatePeerID:
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sw.Logger.Debug("Error dialing peer", "err", err)
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default:
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sw.Logger.Error("Error dialing peer", "err", err)
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}
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}
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}(i)
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}
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return nil
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}
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// DialPeerWithAddress dials the given peer and runs sw.addPeer if it connects and authenticates successfully.
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// If `persistent == true`, the switch will always try to reconnect to this peer if the connection ever fails.
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func (sw *Switch) DialPeerWithAddress(addr *NetAddress, persistent bool) error {
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sw.dialing.Set(string(addr.ID), addr)
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defer sw.dialing.Delete(string(addr.ID))
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return sw.addOutboundPeerWithConfig(addr, sw.config, persistent)
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}
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// sleep for interval plus some random amount of ms on [0, dialRandomizerIntervalMilliseconds]
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func (sw *Switch) randomSleep(interval time.Duration) {
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r := time.Duration(sw.rng.Int63n(dialRandomizerIntervalMilliseconds)) * time.Millisecond
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time.Sleep(r + interval)
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}
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// IsDialingOrExistingAddress returns true if switch has a peer with the given
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// address or dialing it at the moment.
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func (sw *Switch) IsDialingOrExistingAddress(addr *NetAddress) bool {
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return sw.dialing.Has(string(addr.ID)) ||
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sw.peers.Has(addr.ID) ||
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(!sw.config.AllowDuplicateIP && sw.peers.HasIP(addr.IP))
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}
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func (sw *Switch) acceptRoutine() {
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for {
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p, err := sw.transport.Accept(peerConfig{
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chDescs: sw.chDescs,
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onPeerError: sw.StopPeerForError,
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reactorsByCh: sw.reactorsByCh,
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metrics: sw.metrics,
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})
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if err != nil {
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switch err.(type) {
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case ErrRejected:
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rErr := err.(ErrRejected)
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if rErr.IsSelf() {
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// Remove the given address from the address book and add to our addresses
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// to avoid dialing in the future.
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addr := rErr.Addr()
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sw.addrBook.RemoveAddress(&addr)
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sw.addrBook.AddOurAddress(&addr)
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}
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sw.Logger.Info(
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"Inbound Peer rejected",
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"err", err,
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"numPeers", sw.peers.Size(),
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)
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continue
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case *ErrTransportClosed:
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sw.Logger.Error(
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"Stopped accept routine, as transport is closed",
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"numPeers", sw.peers.Size(),
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)
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default:
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sw.Logger.Error(
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"Accept on transport errored",
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"err", err,
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"numPeers", sw.peers.Size(),
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)
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}
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break
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}
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// Ignore connection if we already have enough peers.
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_, in, _ := sw.NumPeers()
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if in >= sw.config.MaxNumInboundPeers {
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sw.Logger.Info(
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"Ignoring inbound connection: already have enough inbound peers",
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"address", p.NodeInfo().NetAddress().String(),
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"have", in,
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"max", sw.config.MaxNumInboundPeers,
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)
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_ = p.Stop()
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continue
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}
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if err := sw.addPeer(p); err != nil {
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_ = p.Stop()
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|
sw.Logger.Info(
|
|
"Ignoring inbound connection: error while adding peer",
|
|
"err", err,
|
|
"id", p.ID(),
|
|
)
|
|
}
|
|
}
|
|
}
|
|
|
|
// dial the peer; make secret connection; authenticate against the dialed ID;
|
|
// add the peer.
|
|
// if dialing fails, start the reconnect loop. If handhsake fails, its over.
|
|
// If peer is started succesffuly, reconnectLoop will start when
|
|
// StopPeerForError is called
|
|
func (sw *Switch) addOutboundPeerWithConfig(
|
|
addr *NetAddress,
|
|
cfg *config.P2PConfig,
|
|
persistent bool,
|
|
) error {
|
|
sw.Logger.Info("Dialing peer", "address", addr)
|
|
|
|
// XXX(xla): Remove the leakage of test concerns in implementation.
|
|
if cfg.TestDialFail {
|
|
go sw.reconnectToPeer(addr)
|
|
return fmt.Errorf("dial err (peerConfig.DialFail == true)")
|
|
}
|
|
|
|
p, err := sw.transport.Dial(*addr, peerConfig{
|
|
chDescs: sw.chDescs,
|
|
onPeerError: sw.StopPeerForError,
|
|
persistent: persistent,
|
|
reactorsByCh: sw.reactorsByCh,
|
|
metrics: sw.metrics,
|
|
})
|
|
if err != nil {
|
|
switch e := err.(type) {
|
|
case ErrRejected:
|
|
if e.IsSelf() {
|
|
// Remove the given address from the address book and add to our addresses
|
|
// to avoid dialing in the future.
|
|
sw.addrBook.RemoveAddress(addr)
|
|
sw.addrBook.AddOurAddress(addr)
|
|
|
|
return err
|
|
}
|
|
}
|
|
|
|
// retry persistent peers after
|
|
// any dial error besides IsSelf()
|
|
if persistent {
|
|
go sw.reconnectToPeer(addr)
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
if err := sw.addPeer(p); err != nil {
|
|
_ = p.Stop()
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) filterPeer(p Peer) error {
|
|
// Avoid duplicate
|
|
if sw.peers.Has(p.ID()) {
|
|
return ErrRejected{id: p.ID(), isDuplicate: true}
|
|
}
|
|
|
|
errc := make(chan error, len(sw.peerFilters))
|
|
|
|
for _, f := range sw.peerFilters {
|
|
go func(f PeerFilterFunc, p Peer, errc chan<- error) {
|
|
errc <- f(sw.peers, p)
|
|
}(f, p, errc)
|
|
}
|
|
|
|
for i := 0; i < cap(errc); i++ {
|
|
select {
|
|
case err := <-errc:
|
|
if err != nil {
|
|
return ErrRejected{id: p.ID(), err: err, isFiltered: true}
|
|
}
|
|
case <-time.After(sw.filterTimeout):
|
|
return ErrFilterTimeout{}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// addPeer starts up the Peer and adds it to the Switch.
|
|
func (sw *Switch) addPeer(p Peer) error {
|
|
if err := sw.filterPeer(p); err != nil {
|
|
return err
|
|
}
|
|
|
|
p.SetLogger(sw.Logger.With("peer", p.NodeInfo().NetAddress()))
|
|
|
|
// All good. Start peer
|
|
if sw.IsRunning() {
|
|
if err := sw.startInitPeer(p); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Add the peer to .peers.
|
|
// We start it first so that a peer in the list is safe to Stop.
|
|
// It should not err since we already checked peers.Has().
|
|
if err := sw.peers.Add(p); err != nil {
|
|
return err
|
|
}
|
|
|
|
sw.Logger.Info("Added peer", "peer", p)
|
|
sw.metrics.Peers.Add(float64(1))
|
|
|
|
return nil
|
|
}
|
|
|
|
func (sw *Switch) startInitPeer(p Peer) error {
|
|
err := p.Start() // spawn send/recv routines
|
|
if err != nil {
|
|
// Should never happen
|
|
sw.Logger.Error(
|
|
"Error starting peer",
|
|
"err", err,
|
|
"peer", p,
|
|
)
|
|
return err
|
|
}
|
|
|
|
for _, reactor := range sw.reactors {
|
|
reactor.AddPeer(p)
|
|
}
|
|
|
|
return nil
|
|
}
|