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664 lines
21 KiB
664 lines
21 KiB
package p2p
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"sync"
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"time"
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"github.com/gogo/protobuf/proto"
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"github.com/tendermint/tendermint/crypto"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/libs/service"
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)
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// RouterOptions specifies options for a Router.
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type RouterOptions struct {
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// ResolveTimeout is the timeout for resolving a PeerAddress URLs.
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// 0 means no timeout.
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ResolveTimeout time.Duration
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// DialTimeout is the timeout for dialing a peer. 0 means no timeout.
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DialTimeout time.Duration
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// HandshakeTimeout is the timeout for handshaking with a peer. 0 means
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// no timeout.
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HandshakeTimeout time.Duration
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}
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// Validate validates the options.
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func (o *RouterOptions) Validate() error {
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return nil
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}
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// Router manages peer connections and routes messages between peers and reactor
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// channels. This is an early prototype.
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//
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// Channels are registered via OpenChannel(). When called, we register an input
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// message queue for the channel in channelQueues and spawn off a goroutine for
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// Router.routeChannel(). This goroutine reads off outbound messages and puts
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// them in the appropriate peer message queue, and processes peer errors which
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// will close (and thus disconnect) the appriate peer queue. It runs until
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// either the channel is closed by the caller or the router is stopped, at which
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// point the input message queue is closed and removed.
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//
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// On startup, the router spawns off three primary goroutines that maintain
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// connections to peers and run for the lifetime of the router:
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//
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// Router.dialPeers(): in a loop, asks the PeerManager for the next peer
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// address to contact, resolves it into endpoints, and attempts to dial
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// each one.
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//
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// Router.acceptPeers(): in a loop, waits for the next inbound connection
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// from a peer, and checks with the PeerManager if it should be accepted.
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//
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// Router.evictPeers(): in a loop, asks the PeerManager for any connected
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// peers to evict, and disconnects them.
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//
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// Once either an inbound or outbound connection has been made, an outbound
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// message queue is registered in Router.peerQueues and a goroutine is spawned
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// off for Router.routePeer() which will spawn off additional goroutines for
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// Router.sendPeer() that sends outbound messages from the peer queue over the
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// connection and for Router.receivePeer() that reads inbound messages from
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// the connection and places them in the appropriate channel queue. When either
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// goroutine exits, the connection and peer queue is closed, which will cause
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// the other goroutines to close as well.
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//
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// The peerStore is used to coordinate peer connections, by only allowing a peer
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// to be claimed (owned) by a single caller at a time (both for outbound and
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// inbound connections). This is done either via peerStore.Dispense() which
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// dispenses and claims an eligible peer to dial, or via peerStore.Claim() which
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// attempts to claim a given peer for an inbound connection. Peers must be
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// returned to the peerStore with peerStore.Return() to release the claim. Over
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// time, the peerStore will also do peer scheduling and prioritization, e.g.
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// ensuring we do exponential backoff on dial failures and connecting to
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// more important peers first (such as persistent peers and validators).
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//
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// An additional goroutine Router.broadcastPeerUpdates() is also spawned off
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// on startup, which consumes peer updates from Router.peerUpdatesCh (currently
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// only connections and disconnections), and broadcasts them to all peer update
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// subscriptions registered via SubscribePeerUpdates().
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//
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// On router shutdown, we close Router.stopCh which will signal to all
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// goroutines to terminate. This in turn will cause all pending channel/peer
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// queues to close, and we wait for this as a signal that goroutines have ended.
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//
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// All message scheduling should be limited to the queue implementations used
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// for channel queues and peer queues. All message sending throughout the router
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// is blocking, and if any messages should be dropped or buffered this is the
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// sole responsibility of the queue, such that we can limit this logic to a
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// single place. There is currently only a FIFO queue implementation that always
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// blocks and never drops messages, but this must be improved with other
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// implementations. The only exception is that all message sending must also
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// select on appropriate channel/queue/router closure signals, to avoid blocking
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// forever on a channel that has no consumer.
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type Router struct {
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*service.BaseService
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logger log.Logger
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nodeInfo NodeInfo
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privKey crypto.PrivKey
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transports map[Protocol]Transport
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peerManager *PeerManager
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options RouterOptions
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// FIXME: Consider using sync.Map.
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peerMtx sync.RWMutex
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peerQueues map[NodeID]queue
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// FIXME: We don't strictly need to use a mutex for this if we seal the
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// channels on router start. This depends on whether we want to allow
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// dynamic channels in the future.
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channelMtx sync.RWMutex
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channelQueues map[ChannelID]queue
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channelMessages map[ChannelID]proto.Message
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// stopCh is used to signal router shutdown, by closing the channel.
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stopCh chan struct{}
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}
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// NewRouter creates a new Router.
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func NewRouter(
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logger log.Logger,
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nodeInfo NodeInfo,
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privKey crypto.PrivKey,
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peerManager *PeerManager,
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transports []Transport,
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options RouterOptions,
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) (*Router, error) {
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if err := options.Validate(); err != nil {
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return nil, err
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}
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router := &Router{
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logger: logger,
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nodeInfo: nodeInfo,
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privKey: privKey,
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transports: map[Protocol]Transport{},
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peerManager: peerManager,
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options: options,
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stopCh: make(chan struct{}),
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channelQueues: map[ChannelID]queue{},
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channelMessages: map[ChannelID]proto.Message{},
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peerQueues: map[NodeID]queue{},
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}
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router.BaseService = service.NewBaseService(logger, "router", router)
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for _, transport := range transports {
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for _, protocol := range transport.Protocols() {
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if _, ok := router.transports[protocol]; !ok {
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router.transports[protocol] = transport
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}
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}
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}
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return router, nil
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}
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// OpenChannel opens a new channel for the given message type. The caller must
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// close the channel when done, and this must happen before the router stops.
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func (r *Router) OpenChannel(id ChannelID, messageType proto.Message) (*Channel, error) {
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// FIXME: NewChannel should take directional channels so we can pass
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// queue.dequeue() instead of reaching inside for queue.queueCh.
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queue := newFIFOQueue()
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channel := NewChannel(id, messageType, queue.queueCh, make(chan Envelope), make(chan PeerError))
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r.channelMtx.Lock()
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defer r.channelMtx.Unlock()
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if _, ok := r.channelQueues[id]; ok {
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return nil, fmt.Errorf("channel %v already exists", id)
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}
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r.channelQueues[id] = queue
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r.channelMessages[id] = messageType
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go func() {
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defer func() {
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r.channelMtx.Lock()
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delete(r.channelQueues, id)
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delete(r.channelMessages, id)
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r.channelMtx.Unlock()
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queue.close()
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}()
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r.routeChannel(channel)
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}()
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return channel, nil
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}
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// routeChannel receives outbound messages and errors from a channel and routes
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// them to the appropriate peer. It returns when either the channel is closed or
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// the router is shutting down.
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func (r *Router) routeChannel(channel *Channel) {
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for {
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select {
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case envelope, ok := <-channel.outCh:
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if !ok {
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return
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}
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// FIXME: This is a bit unergonomic, maybe it'd be better for Wrap()
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// to return a wrapped copy.
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if _, ok := channel.messageType.(Wrapper); ok {
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wrapper := proto.Clone(channel.messageType)
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if err := wrapper.(Wrapper).Wrap(envelope.Message); err != nil {
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r.Logger.Error("failed to wrap message", "err", err)
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continue
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}
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envelope.Message = wrapper
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}
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envelope.channelID = channel.id
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if envelope.Broadcast {
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r.peerMtx.RLock()
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peerQueues := make(map[NodeID]queue, len(r.peerQueues))
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for peerID, peerQueue := range r.peerQueues {
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peerQueues[peerID] = peerQueue
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}
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r.peerMtx.RUnlock()
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for peerID, peerQueue := range peerQueues {
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e := envelope
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e.Broadcast = false
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e.To = peerID
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select {
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case peerQueue.enqueue() <- e:
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case <-peerQueue.closed():
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case <-r.stopCh:
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return
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}
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}
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} else {
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r.peerMtx.RLock()
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peerQueue, ok := r.peerQueues[envelope.To]
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r.peerMtx.RUnlock()
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if !ok {
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r.logger.Error("dropping message for non-connected peer",
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"peer", envelope.To, "channel", channel.id)
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continue
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}
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select {
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case peerQueue.enqueue() <- envelope:
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case <-peerQueue.closed():
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r.logger.Error("dropping message for non-connected peer",
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"peer", envelope.To, "channel", channel.id)
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case <-r.stopCh:
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return
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}
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}
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case peerError, ok := <-channel.errCh:
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if !ok {
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return
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}
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// FIXME: We just disconnect the peer for now
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r.logger.Error("peer error, disconnecting", "peer", peerError.PeerID, "err", peerError.Err)
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r.peerMtx.RLock()
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peerQueue, ok := r.peerQueues[peerError.PeerID]
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r.peerMtx.RUnlock()
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if ok {
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peerQueue.close()
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}
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case <-channel.Done():
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return
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case <-r.stopCh:
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return
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}
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}
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}
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// acceptPeers accepts inbound connections from peers on the given transport.
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func (r *Router) acceptPeers(transport Transport) {
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ctx := r.stopCtx()
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for {
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// FIXME: We may need transports to enforce some sort of rate limiting
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// here (e.g. by IP address), or alternatively have PeerManager.Accepted()
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// do it for us.
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//
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// FIXME: Even though PeerManager enforces MaxConnected, we may want to
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// limit the maximum number of active connections here too, since e.g.
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// an adversary can open a ton of connections and then just hang during
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// the handshake, taking up TCP socket descriptors.
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//
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// FIXME: The old P2P stack rejected multiple connections for the same IP
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// unless P2PConfig.AllowDuplicateIP is true -- it's better to limit this
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// by peer ID rather than IP address, so this hasn't been implemented and
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// probably shouldn't (?).
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//
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// FIXME: The old P2P stack supported ABCI-based IP address filtering via
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// /p2p/filter/addr/<ip> queries, do we want to implement this here as well?
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// Filtering by node ID is probably better.
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conn, err := transport.Accept(ctx)
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switch err {
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case nil:
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case ErrTransportClosed{}, io.EOF, context.Canceled:
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r.logger.Debug("stopping accept routine", "transport", transport)
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return
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default:
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r.logger.Error("failed to accept connection", "transport", transport, "err", err)
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continue
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}
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go func() {
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defer func() {
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_ = conn.Close()
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}()
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// FIXME: Because we do the handshake in each transport, rather than
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// here in the Router, the remote peer will think they've
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// successfully connected and start sending us messages, although we
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// can end up rejecting the connection here. This can e.g. cause
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// problems in tests, where because of race conditions a
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// disconnection can cause the local node to immediately redial,
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// while the remote node may not have completed the disconnection
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// registration yet and reject the accept below.
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//
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// The Router should do the handshake, and we should check with the
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// peer manager before completing the handshake -- this probably
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// requires protocol changes to send an additional message when the
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// handshake is accepted.
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peerInfo, _, err := r.handshakePeer(ctx, conn, "")
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if err == context.Canceled {
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return
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} else if err != nil {
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r.logger.Error("failed to handshake with peer", "err", err)
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return
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}
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if err := r.peerManager.Accepted(peerInfo.NodeID); err != nil {
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r.logger.Error("failed to accept connection", "peer", peerInfo.NodeID, "err", err)
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return
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}
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queue := newFIFOQueue()
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r.peerMtx.Lock()
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r.peerQueues[peerInfo.NodeID] = queue
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r.peerMtx.Unlock()
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r.peerManager.Ready(peerInfo.NodeID)
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defer func() {
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r.peerMtx.Lock()
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delete(r.peerQueues, peerInfo.NodeID)
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r.peerMtx.Unlock()
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queue.close()
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if err := r.peerManager.Disconnected(peerInfo.NodeID); err != nil {
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r.logger.Error("failed to disconnect peer", "peer", peerInfo.NodeID, "err", err)
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}
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}()
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r.routePeer(peerInfo.NodeID, conn, queue)
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}()
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}
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}
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// dialPeers maintains outbound connections to peers.
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func (r *Router) dialPeers() {
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ctx := r.stopCtx()
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for {
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peerID, address, err := r.peerManager.DialNext(ctx)
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switch err {
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case nil:
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case context.Canceled:
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r.logger.Debug("stopping dial routine")
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return
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default:
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r.logger.Error("failed to find next peer to dial", "err", err)
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return
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}
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go func() {
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conn, err := r.dialPeer(ctx, address)
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if errors.Is(err, context.Canceled) {
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return
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} else if err != nil {
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r.logger.Error("failed to dial peer", "peer", peerID, "err", err)
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if err = r.peerManager.DialFailed(peerID, address); err != nil {
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r.logger.Error("failed to report dial failure", "peer", peerID, "err", err)
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}
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return
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}
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defer conn.Close()
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_, _, err = r.handshakePeer(ctx, conn, peerID)
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if errors.Is(err, context.Canceled) {
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return
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} else if err != nil {
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r.logger.Error("failed to handshake with peer", "peer", peerID, "err", err)
|
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if err = r.peerManager.DialFailed(peerID, address); err != nil {
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r.logger.Error("failed to report dial failure", "peer", peerID, "err", err)
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}
|
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return
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}
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|
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if err = r.peerManager.Dialed(peerID, address); err != nil {
|
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r.logger.Error("failed to dial peer", "peer", peerID, "err", err)
|
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return
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}
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|
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queue := newFIFOQueue()
|
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r.peerMtx.Lock()
|
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r.peerQueues[peerID] = queue
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r.peerMtx.Unlock()
|
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r.peerManager.Ready(peerID)
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defer func() {
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r.peerMtx.Lock()
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delete(r.peerQueues, peerID)
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r.peerMtx.Unlock()
|
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queue.close()
|
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if err := r.peerManager.Disconnected(peerID); err != nil {
|
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r.logger.Error("failed to disconnect peer", "peer", peerID, "err", err)
|
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}
|
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}()
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|
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r.routePeer(peerID, conn, queue)
|
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}()
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}
|
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}
|
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|
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// dialPeer connects to a peer by dialing it.
|
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func (r *Router) dialPeer(ctx context.Context, address PeerAddress) (Connection, error) {
|
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r.logger.Info("resolving peer address", "address", address)
|
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resolveCtx := ctx
|
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if r.options.ResolveTimeout > 0 {
|
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var cancel context.CancelFunc
|
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resolveCtx, cancel = context.WithTimeout(resolveCtx, r.options.ResolveTimeout)
|
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defer cancel()
|
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}
|
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endpoints, err := address.Resolve(resolveCtx)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to resolve address %q: %w", address, err)
|
|
}
|
|
|
|
for _, endpoint := range endpoints {
|
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transport, ok := r.transports[endpoint.Protocol]
|
|
if !ok {
|
|
r.logger.Error("no transport found for endpoint protocol", "endpoint", endpoint)
|
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continue
|
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}
|
|
|
|
dialCtx := ctx
|
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if r.options.DialTimeout > 0 {
|
|
var cancel context.CancelFunc
|
|
dialCtx, cancel = context.WithTimeout(dialCtx, r.options.DialTimeout)
|
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defer cancel()
|
|
}
|
|
|
|
// FIXME: When we dial and handshake the peer, we should pass it
|
|
// appropriate address(es) it can use to dial us back. It can't use our
|
|
// remote endpoint, since TCP uses different port numbers for outbound
|
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// connections than it does for inbound. Also, we may need to vary this
|
|
// by the peer's endpoint, since e.g. a peer on 192.168.0.0 can reach us
|
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// on a private address on this endpoint, but a peer on the public
|
|
// Internet can't and needs a different public address.
|
|
conn, err := transport.Dial(dialCtx, endpoint)
|
|
if err != nil {
|
|
r.logger.Error("failed to dial endpoint", "endpoint", endpoint, "err", err)
|
|
} else {
|
|
r.logger.Info("connected to peer", "peer", address.NodeID, "endpoint", endpoint)
|
|
return conn, nil
|
|
}
|
|
}
|
|
return nil, fmt.Errorf("failed to connect to peer via %q", address)
|
|
}
|
|
|
|
// handshakePeer handshakes with a peer, validating the peer's information. If
|
|
// expectID is given, we check that the peer's public key matches it.
|
|
func (r *Router) handshakePeer(ctx context.Context, conn Connection, expectID NodeID) (NodeInfo, crypto.PubKey, error) {
|
|
if r.options.HandshakeTimeout > 0 {
|
|
var cancel context.CancelFunc
|
|
ctx, cancel = context.WithTimeout(ctx, r.options.HandshakeTimeout)
|
|
defer cancel()
|
|
}
|
|
peerInfo, peerKey, err := conn.Handshake(ctx, r.nodeInfo, r.privKey)
|
|
if err != nil {
|
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return peerInfo, peerKey, err
|
|
}
|
|
if err = peerInfo.Validate(); err != nil {
|
|
return peerInfo, peerKey, fmt.Errorf("invalid handshake NodeInfo: %w", err)
|
|
}
|
|
if expectID != "" && expectID != peerInfo.NodeID {
|
|
return peerInfo, peerKey, fmt.Errorf("expected to connect with peer %q, got %q",
|
|
expectID, peerInfo.NodeID)
|
|
}
|
|
if NodeIDFromPubKey(peerKey) != peerInfo.NodeID {
|
|
return peerInfo, peerKey, fmt.Errorf("peer's public key did not match its node ID %q (expected %q)",
|
|
peerInfo.NodeID, NodeIDFromPubKey(peerKey))
|
|
}
|
|
if peerInfo.NodeID == r.nodeInfo.NodeID {
|
|
return peerInfo, peerKey, errors.New("rejecting handshake with self")
|
|
}
|
|
return peerInfo, peerKey, nil
|
|
}
|
|
|
|
// routePeer routes inbound messages from a peer to channels, and also sends
|
|
// outbound queued messages to the peer. It will close the connection and send
|
|
// queue, using this as a signal to coordinate the internal receivePeer() and
|
|
// sendPeer() goroutines. It blocks until the peer is done, e.g. when the
|
|
// connection or queue is closed.
|
|
func (r *Router) routePeer(peerID NodeID, conn Connection, sendQueue queue) {
|
|
r.logger.Info("routing peer", "peer", peerID)
|
|
resultsCh := make(chan error, 2)
|
|
go func() {
|
|
resultsCh <- r.receivePeer(peerID, conn)
|
|
}()
|
|
go func() {
|
|
resultsCh <- r.sendPeer(peerID, conn, sendQueue)
|
|
}()
|
|
|
|
err := <-resultsCh
|
|
_ = conn.Close()
|
|
sendQueue.close()
|
|
if e := <-resultsCh; err == nil {
|
|
// The first err was nil, so we update it with the second result,
|
|
// which may or may not be nil.
|
|
err = e
|
|
}
|
|
switch err {
|
|
case nil, io.EOF, ErrTransportClosed{}:
|
|
r.logger.Info("peer disconnected", "peer", peerID)
|
|
default:
|
|
r.logger.Error("peer failure", "peer", peerID, "err", err)
|
|
}
|
|
}
|
|
|
|
// receivePeer receives inbound messages from a peer, deserializes them and
|
|
// passes them on to the appropriate channel.
|
|
func (r *Router) receivePeer(peerID NodeID, conn Connection) error {
|
|
for {
|
|
chID, bz, err := conn.ReceiveMessage()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
r.channelMtx.RLock()
|
|
queue, ok := r.channelQueues[ChannelID(chID)]
|
|
messageType := r.channelMessages[ChannelID(chID)]
|
|
r.channelMtx.RUnlock()
|
|
if !ok {
|
|
r.logger.Error("dropping message for unknown channel", "peer", peerID, "channel", chID)
|
|
continue
|
|
}
|
|
|
|
msg := proto.Clone(messageType)
|
|
if err := proto.Unmarshal(bz, msg); err != nil {
|
|
r.logger.Error("message decoding failed, dropping message", "peer", peerID, "err", err)
|
|
continue
|
|
}
|
|
if wrapper, ok := msg.(Wrapper); ok {
|
|
msg, err = wrapper.Unwrap()
|
|
if err != nil {
|
|
r.logger.Error("failed to unwrap message", "err", err)
|
|
continue
|
|
}
|
|
}
|
|
|
|
select {
|
|
// FIXME: ReceiveMessage() should return ChannelID.
|
|
case queue.enqueue() <- Envelope{channelID: ChannelID(chID), From: peerID, Message: msg}:
|
|
r.logger.Debug("received message", "peer", peerID, "message", msg)
|
|
case <-queue.closed():
|
|
r.logger.Error("channel closed, dropping message", "peer", peerID, "channel", chID)
|
|
case <-r.stopCh:
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
// sendPeer sends queued messages to a peer.
|
|
func (r *Router) sendPeer(peerID NodeID, conn Connection, queue queue) error {
|
|
for {
|
|
select {
|
|
case envelope := <-queue.dequeue():
|
|
bz, err := proto.Marshal(envelope.Message)
|
|
if err != nil {
|
|
r.logger.Error("failed to marshal message", "peer", peerID, "err", err)
|
|
continue
|
|
}
|
|
|
|
// FIXME: SendMessage() should take ChannelID.
|
|
_, err = conn.SendMessage(byte(envelope.channelID), bz)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
r.logger.Debug("sent message", "peer", envelope.To, "message", envelope.Message)
|
|
|
|
case <-queue.closed():
|
|
return nil
|
|
|
|
case <-r.stopCh:
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
// evictPeers evicts connected peers as requested by the peer manager.
|
|
func (r *Router) evictPeers() {
|
|
ctx := r.stopCtx()
|
|
for {
|
|
peerID, err := r.peerManager.EvictNext(ctx)
|
|
switch err {
|
|
case nil:
|
|
case context.Canceled:
|
|
r.logger.Debug("stopping evict routine")
|
|
return
|
|
default:
|
|
r.logger.Error("failed to find next peer to evict", "err", err)
|
|
return
|
|
}
|
|
|
|
r.logger.Info("evicting peer", "peer", peerID)
|
|
r.peerMtx.RLock()
|
|
if queue, ok := r.peerQueues[peerID]; ok {
|
|
queue.close()
|
|
}
|
|
r.peerMtx.RUnlock()
|
|
}
|
|
}
|
|
|
|
// OnStart implements service.Service.
|
|
func (r *Router) OnStart() error {
|
|
go r.dialPeers()
|
|
for _, transport := range r.transports {
|
|
go r.acceptPeers(transport)
|
|
}
|
|
go r.evictPeers()
|
|
return nil
|
|
}
|
|
|
|
// OnStop implements service.Service.
|
|
func (r *Router) OnStop() {
|
|
// Collect all active queues, so we can wait for them to close.
|
|
queues := []queue{}
|
|
r.channelMtx.RLock()
|
|
for _, q := range r.channelQueues {
|
|
queues = append(queues, q)
|
|
}
|
|
r.channelMtx.RUnlock()
|
|
r.peerMtx.RLock()
|
|
for _, q := range r.peerQueues {
|
|
queues = append(queues, q)
|
|
}
|
|
r.peerMtx.RUnlock()
|
|
|
|
// Signal router shutdown, and wait for queues (and thus goroutines)
|
|
// to complete.
|
|
close(r.stopCh)
|
|
for _, q := range queues {
|
|
<-q.closed()
|
|
}
|
|
}
|
|
|
|
// stopCtx returns a context that is cancelled when the router stops.
|
|
func (r *Router) stopCtx() context.Context {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
go func() {
|
|
<-r.stopCh
|
|
cancel()
|
|
}()
|
|
return ctx
|
|
}
|