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779 lines
24 KiB
779 lines
24 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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// ChannelID is an arbitrary channel ID.
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type ChannelID uint16
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// Envelope contains a message with sender/receiver routing info.
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type Envelope struct {
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From NodeID // sender (empty if outbound)
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To NodeID // receiver (empty if inbound)
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Broadcast bool // send to all connected peers (ignores To)
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Message proto.Message // message payload
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// channelID is for internal Router use, set on outbound messages to inform
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// the sendPeer() goroutine which transport channel to use.
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//
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// FIXME: If we migrate the Transport API to a byte-oriented multi-stream
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// API, this will no longer be necessary since each channel will be mapped
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// onto a stream during channel/peer setup. See:
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// https://github.com/tendermint/spec/pull/227
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channelID ChannelID
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}
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// PeerError is a peer error reported via Channel.Error.
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//
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// FIXME: This currently just disconnects the peer, which is too simplistic.
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// For example, some errors should be logged, some should cause disconnects,
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// and some should ban the peer.
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//
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// FIXME: This should probably be replaced by a more general PeerBehavior
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// concept that can mark good and bad behavior and contributes to peer scoring.
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// It should possibly also allow reactors to request explicit actions, e.g.
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// disconnection or banning, in addition to doing this based on aggregates.
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type PeerError struct {
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NodeID NodeID
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Err error
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}
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// Channel is a bidirectional channel to exchange Protobuf messages with peers,
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// wrapped in Envelope to specify routing info (i.e. sender/receiver).
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type Channel struct {
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ID ChannelID
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In <-chan Envelope // inbound messages (peers to reactors)
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Out chan<- Envelope // outbound messages (reactors to peers)
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Error chan<- PeerError // peer error reporting
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messageType proto.Message // the channel's message type, used for unmarshaling
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closeCh chan struct{}
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closeOnce sync.Once
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}
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// NewChannel creates a new channel. It is primarily for internal and test
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// use, reactors should use Router.OpenChannel().
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func NewChannel(
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id ChannelID,
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messageType proto.Message,
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inCh <-chan Envelope,
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outCh chan<- Envelope,
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errCh chan<- PeerError,
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) *Channel {
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return &Channel{
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ID: id,
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messageType: messageType,
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In: inCh,
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Out: outCh,
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Error: errCh,
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closeCh: make(chan struct{}),
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}
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}
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// Close closes the channel. Future sends on Out and Error will panic. The In
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// channel remains open to avoid having to synchronize Router senders, which
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// should use Done() to detect channel closure instead.
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func (c *Channel) Close() {
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c.closeOnce.Do(func() {
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close(c.closeCh)
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close(c.Out)
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close(c.Error)
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})
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}
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// Done returns a channel that's closed when Channel.Close() is called.
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func (c *Channel) Done() <-chan struct{} {
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return c.closeCh
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}
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// Wrapper is a Protobuf message that can contain a variety of inner messages
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// (e.g. via oneof fields). If a Channel's message type implements Wrapper, the
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// Router will automatically wrap outbound messages and unwrap inbound messages,
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// such that reactors do not have to do this themselves.
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type Wrapper interface {
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proto.Message
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// Wrap will take a message and wrap it in this one if possible.
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Wrap(proto.Message) error
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// Unwrap will unwrap the inner message contained in this message.
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Unwrap() (proto.Message, error)
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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 NodeAddress 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 router 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. It takes a PeerManager for peer lifecycle management (e.g. which
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// peers to dial and when) and a set of Transports for connecting and
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// communicating with peers.
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//
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// On startup, three main goroutines are spawned to maintain peer connections:
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//
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// dialPeers(): in a loop, calls PeerManager.DialNext() to get the next peer
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// address to dial and spawns a goroutine that dials the peer, handshakes
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// with it, and begins to route messages if successful.
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//
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// acceptPeers(): in a loop, waits for an inbound connection via
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// Transport.Accept() and spawns a goroutine that handshakes with it and
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// begins to route messages if successful.
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//
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// evictPeers(): in a loop, calls PeerManager.EvictNext() to get the next
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// peer to evict, and disconnects it by closing its message queue.
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//
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// When a peer is connected, an outbound peer message queue is registered in
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// peerQueues, and routePeer() is called to spawn off two additional goroutines:
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//
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// sendPeer(): waits for an outbound message from the peerQueues queue,
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// marshals it, and passes it to the peer transport which delivers it.
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//
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// receivePeer(): waits for an inbound message from the peer transport,
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// unmarshals it, and passes it to the appropriate inbound channel queue
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// in channelQueues.
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//
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// When a reactor opens a channel via OpenChannel, an inbound channel message
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// queue is registered in channelQueues, and a channel goroutine is spawned:
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//
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// routeChannel(): waits for an outbound message from the channel, looks
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// up the recipient peer's outbound message queue in peerQueues, and submits
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// the message to it.
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//
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// All channel sends in the router are blocking. It is the responsibility of the
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// queue interface in peerQueues and channelQueues to prioritize and drop
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// messages as appropriate during contention to prevent stalls and ensure good
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// quality of service.
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type Router struct {
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*service.BaseService
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logger log.Logger
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options RouterOptions
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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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protocolTransports map[Protocol]Transport
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stopCh chan struct{} // signals Router shutdown
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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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}
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// NewRouter creates a new Router. The given Transports must already be
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// listening on appropriate interfaces, and will be closed by the Router when it
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// stops.
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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: transports,
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protocolTransports: 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.protocolTransports[protocol]; !ok {
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router.protocolTransports[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, before stopping the Router. messageType is the
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// type of message passed through the channel (used for unmarshaling), which can
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// implement Wrapper to automatically (un)wrap multiple message types in a
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// wrapper message. The caller may provide a size to make the channel buffered,
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// which internally makes the inbound, outbound, and error channel buffered.
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func (r *Router) OpenChannel(id ChannelID, messageType proto.Message, size int) (*Channel, error) {
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queue := newFIFOQueue(size)
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outCh := make(chan Envelope, size)
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errCh := make(chan PeerError, size)
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channel := NewChannel(id, messageType, queue.dequeue(), outCh, errCh)
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var wrapper Wrapper
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if w, ok := messageType.(Wrapper); ok {
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wrapper = w
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}
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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(id, outCh, errCh, wrapper)
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}()
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return channel, nil
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}
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// routeChannel receives outbound channel messages and routes them to the
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// appropriate peer. It also receives peer errors and reports them to the peer
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// manager. It returns when either the outbound channel or error channel is
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// closed, or the Router is stopped. wrapper is an optional message wrapper
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// for messages, see Wrapper for details.
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func (r *Router) routeChannel(
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chID ChannelID,
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outCh <-chan Envelope,
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errCh <-chan PeerError,
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wrapper Wrapper,
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) {
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for {
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select {
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case envelope, ok := <-outCh:
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if !ok {
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return
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}
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// Mark the envelope with the channel ID to allow sendPeer() to pass
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// it on to Transport.SendMessage().
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envelope.channelID = chID
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// Wrap the message in a wrapper message, if requested.
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if wrapper != nil {
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msg := proto.Clone(wrapper)
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if err := msg.(Wrapper).Wrap(envelope.Message); err != nil {
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r.Logger.Error("failed to wrap message", "channel", chID, "err", err)
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continue
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}
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envelope.Message = msg
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}
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// Collect peer queues to pass the message via.
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var queues []queue
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if envelope.Broadcast {
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r.peerMtx.RLock()
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queues = make([]queue, 0, len(r.peerQueues))
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for _, q := range r.peerQueues {
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queues = append(queues, q)
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}
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r.peerMtx.RUnlock()
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} else {
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r.peerMtx.RLock()
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q, ok := r.peerQueues[envelope.To]
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r.peerMtx.RUnlock()
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if !ok {
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r.logger.Debug("dropping message for unconnected peer",
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"peer", envelope.To, "channel", chID)
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continue
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}
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queues = []queue{q}
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}
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// Send message to peers.
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for _, q := range queues {
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select {
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case q.enqueue() <- envelope:
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case <-q.closed():
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r.logger.Debug("dropping message for unconnected peer",
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"peer", envelope.To, "channel", chID)
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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 := <-errCh:
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if !ok {
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return
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}
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r.logger.Error("peer error, evicting", "peer", peerError.NodeID, "err", peerError.Err)
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if err := r.peerManager.Errored(peerError.NodeID, peerError.Err); err != nil {
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r.logger.Error("failed to report peer error", "peer", peerError.NodeID, "err", err)
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}
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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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// and spawns goroutines that route messages to/from them.
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func (r *Router) acceptPeers(transport Transport) {
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r.logger.Debug("starting accept routine", "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()
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switch err {
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case nil:
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case io.EOF:
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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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return
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}
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// Spawn a goroutine for the handshake, to avoid head-of-line blocking.
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go func() {
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defer conn.Close()
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// FIXME: The peer manager may reject the peer during Accepted()
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// after we've handshaked with the peer (to find out which peer it
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// is). However, because the handshake has no ack, the remote peer
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// will think the handshake was successful and start sending us
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// messages.
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//
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// This can cause problems in tests, where a disconnection can cause
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// the local node to immediately redial, while the remote node may
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// not have completed the disconnection yet and therefore reject the
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// reconnection attempt (since it thinks we're still connected from
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// before).
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//
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// The Router should do the handshake and have a final ack/fail
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// message to make sure both ends have accepted the connection, such
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// that it can be coordinated with the peer manager.
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peerInfo, _, err := r.handshakePeer(ctx, conn, "")
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switch {
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case errors.Is(err, context.Canceled):
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return
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case err != nil:
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r.logger.Error("peer handshake failed", "endpoint", conn, "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(0)
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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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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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if err := r.peerManager.Ready(peerInfo.NodeID); err != nil {
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r.logger.Error("failed to mark peer as ready", "peer", peerInfo.NodeID, "err", err)
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return
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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 by dialing them.
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func (r *Router) dialPeers() {
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r.logger.Debug("starting dial routine")
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ctx := r.stopCtx()
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for {
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address, err := r.peerManager.DialNext(ctx)
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switch {
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case errors.Is(err, context.Canceled):
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r.logger.Debug("stopping dial routine")
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return
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case err != nil:
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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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// Spawn off a goroutine to actually dial the peer, so that we can
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// dial multiple peers in parallel.
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go func() {
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conn, err := r.dialPeer(ctx, address)
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switch {
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case errors.Is(err, context.Canceled):
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return
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case err != nil:
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r.logger.Error("failed to dial peer", "peer", address, "err", err)
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if err = r.peerManager.DialFailed(address); err != nil {
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r.logger.Error("failed to report dial failure", "peer", address, "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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peerID := address.NodeID
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_, _, err = r.handshakePeer(ctx, conn, peerID)
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switch {
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case errors.Is(err, context.Canceled):
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return
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case err != nil:
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r.logger.Error("failed to handshake with peer", "peer", address, "err", err)
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if err = r.peerManager.DialFailed(address); err != nil {
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r.logger.Error("failed to report dial failure", "peer", address, "err", err)
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}
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return
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}
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if err = r.peerManager.Dialed(address); err != nil {
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r.logger.Error("failed to dial peer", "peer", address, "err", err)
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return
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}
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queue := newFIFOQueue(0)
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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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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", address, "err", err)
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}
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}()
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if err := r.peerManager.Ready(peerID); err != nil {
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r.logger.Error("failed to mark peer as ready", "peer", address, "err", err)
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return
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}
|
|
|
|
r.routePeer(peerID, conn, queue)
|
|
}()
|
|
}
|
|
}
|
|
|
|
// dialPeer connects to a peer by dialing it.
|
|
func (r *Router) dialPeer(ctx context.Context, address NodeAddress) (Connection, error) {
|
|
resolveCtx := ctx
|
|
if r.options.ResolveTimeout > 0 {
|
|
var cancel context.CancelFunc
|
|
resolveCtx, cancel = context.WithTimeout(resolveCtx, r.options.ResolveTimeout)
|
|
defer cancel()
|
|
}
|
|
|
|
r.logger.Debug("resolving peer address", "peer", address)
|
|
endpoints, err := address.Resolve(resolveCtx)
|
|
switch {
|
|
case err != nil:
|
|
return nil, fmt.Errorf("failed to resolve address %q: %w", address, err)
|
|
case len(endpoints) == 0:
|
|
return nil, fmt.Errorf("address %q did not resolve to any endpoints", address)
|
|
}
|
|
|
|
for _, endpoint := range endpoints {
|
|
transport, ok := r.protocolTransports[endpoint.Protocol]
|
|
if !ok {
|
|
r.logger.Error("no transport found for protocol", "endpoint", endpoint)
|
|
continue
|
|
}
|
|
|
|
dialCtx := ctx
|
|
if r.options.DialTimeout > 0 {
|
|
var cancel context.CancelFunc
|
|
dialCtx, cancel = context.WithTimeout(dialCtx, r.options.DialTimeout)
|
|
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
|
|
// 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
|
|
// 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", "peer", address.NodeID, "endpoint", endpoint, "err", err)
|
|
} else {
|
|
r.logger.Debug("dialed peer", "peer", address.NodeID, "endpoint", endpoint)
|
|
return conn, nil
|
|
}
|
|
}
|
|
return nil, errors.New("all endpoints failed")
|
|
}
|
|
|
|
// handshakePeer handshakes with a peer, validating the peer's information. If
|
|
// expectID is given, we check that the peer's info 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 {
|
|
return peerInfo, peerKey, err
|
|
}
|
|
|
|
if err = peerInfo.Validate(); err != nil {
|
|
return peerInfo, peerKey, fmt.Errorf("invalid handshake NodeInfo: %w", err)
|
|
}
|
|
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 expectID != "" && expectID != peerInfo.NodeID {
|
|
return peerInfo, peerKey, fmt.Errorf("expected to connect with peer %q, got %q",
|
|
expectID, peerInfo.NodeID)
|
|
}
|
|
return peerInfo, peerKey, nil
|
|
}
|
|
|
|
// routePeer routes inbound and outbound messages between a peer and the reactor
|
|
// channels. It will close the given connection and send queue when done, or if
|
|
// they are closed elsewhere it will cause this method to shut down and return.
|
|
func (r *Router) routePeer(peerID NodeID, conn Connection, sendQueue queue) {
|
|
r.logger.Info("peer connected", "peer", peerID, "endpoint", conn)
|
|
errCh := make(chan error, 2)
|
|
go func() {
|
|
errCh <- r.receivePeer(peerID, conn)
|
|
}()
|
|
go func() {
|
|
errCh <- r.sendPeer(peerID, conn, sendQueue)
|
|
}()
|
|
|
|
err := <-errCh
|
|
_ = conn.Close()
|
|
sendQueue.close()
|
|
if e := <-errCh; err == nil {
|
|
// The first err was nil, so we update it with the second err, which may
|
|
// or may not be nil.
|
|
err = e
|
|
}
|
|
switch err {
|
|
case nil, io.EOF:
|
|
r.logger.Info("peer disconnected", "peer", peerID, "endpoint", conn)
|
|
default:
|
|
r.logger.Error("peer failure", "peer", peerID, "endpoint", conn, "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[chID]
|
|
messageType := r.channelMessages[chID]
|
|
r.channelMtx.RUnlock()
|
|
if !ok {
|
|
r.logger.Debug("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 {
|
|
case queue.enqueue() <- Envelope{From: peerID, Message: msg}:
|
|
r.logger.Debug("received message", "peer", peerID, "message", msg)
|
|
case <-queue.closed():
|
|
r.logger.Debug("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():
|
|
if envelope.Message == nil {
|
|
r.logger.Error("dropping nil message", "peer", peerID)
|
|
continue
|
|
}
|
|
bz, err := proto.Marshal(envelope.Message)
|
|
if err != nil {
|
|
r.logger.Error("failed to marshal message", "peer", peerID, "err", err)
|
|
continue
|
|
}
|
|
|
|
_, err = conn.SendMessage(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() {
|
|
r.logger.Debug("starting evict routine")
|
|
ctx := r.stopCtx()
|
|
for {
|
|
peerID, err := r.peerManager.EvictNext(ctx)
|
|
switch {
|
|
case errors.Is(err, context.Canceled):
|
|
r.logger.Debug("stopping evict routine")
|
|
return
|
|
case err != nil:
|
|
r.logger.Error("failed to find next peer to evict", "err", err)
|
|
return
|
|
}
|
|
|
|
r.logger.Info("evicting peer", "peer", peerID)
|
|
r.peerMtx.RLock()
|
|
queue, ok := r.peerQueues[peerID]
|
|
r.peerMtx.RUnlock()
|
|
if ok {
|
|
queue.close()
|
|
}
|
|
}
|
|
}
|
|
|
|
// OnStart implements service.Service.
|
|
func (r *Router) OnStart() error {
|
|
go r.dialPeers()
|
|
go r.evictPeers()
|
|
for _, transport := range r.transports {
|
|
go r.acceptPeers(transport)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// OnStop implements service.Service.
|
|
//
|
|
// All channels must be closed by OpenChannel() callers before stopping the
|
|
// router, to prevent blocked channel sends in reactors. Channels are not closed
|
|
// here, since that would cause any reactor senders to panic, so it is the
|
|
// sender's responsibility.
|
|
func (r *Router) OnStop() {
|
|
// Signal router shutdown.
|
|
close(r.stopCh)
|
|
|
|
// Close transport listeners (unblocks Accept calls).
|
|
for _, transport := range r.transports {
|
|
if err := transport.Close(); err != nil {
|
|
r.logger.Error("failed to close transport", "transport", transport, "err", err)
|
|
}
|
|
}
|
|
|
|
// Collect all remaining queues, and 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()
|
|
for _, q := range queues {
|
|
<-q.closed()
|
|
}
|
|
}
|
|
|
|
// stopCtx returns a new context that is canceled when the router stops.
|
|
func (r *Router) stopCtx() context.Context {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
go func() {
|
|
<-r.stopCh
|
|
cancel()
|
|
}()
|
|
return ctx
|
|
}
|