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Merge pull request #2690 from cfromknecht/hwsc-fndg-priority-queue

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peer: deprioritize gossip traffic
This commit is contained in:
Olaoluwa Osuntokun 2019-03-05 21:08:26 -08:00 committed by GitHub
commit c853555d1b
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8 changed files with 122 additions and 124 deletions
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4
discovery/gossiper.go
View File

@ -358,7 +358,7 @@ func (d *AuthenticatedGossiper) SynchronizeNode(syncPeer lnpeer.Peer) error {
// With all the announcement messages gathered, send them all in a
// single batch to the target peer.
return syncPeer.SendMessage(false, announceMessages...)
return syncPeer.SendMessageLazy(false, announceMessages...)
}
// PropagateChanPolicyUpdate signals the AuthenticatedGossiper to update the
@ -1111,7 +1111,7 @@ func (d *AuthenticatedGossiper) InitSyncState(syncPeer lnpeer.Peer,
encodingType: encoding,
chunkSize: encodingTypeToChunkSize[encoding],
sendToPeer: func(msgs ...lnwire.Message) error {
return syncPeer.SendMessage(false, msgs...)
return syncPeer.SendMessageLazy(false, msgs...)
},
})
copy(syncer.peerPub[:], nodeID[:])

5
discovery/mock_test.go
View File

@ -35,6 +35,11 @@ func (p *mockPeer) SendMessage(_ bool, msgs ...lnwire.Message) error {
return nil
}
func (p *mockPeer) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
return p.SendMessage(sync, msgs...)
}
func (p *mockPeer) AddNewChannel(_ *channeldb.OpenChannel, _ <-chan struct{}) error {
return nil
}

4
fundingmanager_test.go
View File

@ -170,6 +170,10 @@ func (n *testNode) SendMessage(_ bool, msg ...lnwire.Message) error {
return n.sendMessage(msg[0])
}
func (n *testNode) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
return n.SendMessage(sync, msgs...)
}
func (n *testNode) WipeChannel(_ *wire.OutPoint) error {
return nil
}

3
htlcswitch/link_test.go
View File

@ -1549,6 +1549,9 @@ func (m *mockPeer) SendMessage(sync bool, msgs ...lnwire.Message) error {
}
return nil
}
func (m *mockPeer) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
return m.SendMessage(sync, msgs...)
}
func (m *mockPeer) AddNewChannel(_ *channeldb.OpenChannel,
_ <-chan struct{}) error {
return nil

4
htlcswitch/mock.go
View File

@ -502,6 +502,10 @@ func (s *mockServer) SendMessage(sync bool, msgs ...lnwire.Message) error {
return nil
}
func (s *mockServer) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
panic("not implemented")
}
func (s *mockServer) readHandler(message lnwire.Message) error {
var targetChan lnwire.ChannelID

15
lnpeer/peer.go
View File

@ -12,10 +12,17 @@ import (
// Peer is an interface which represents the remote lightning node inside our
// system.
type Peer interface {
// SendMessage sends a variadic number of message to remote peer. The
// first argument denotes if the method should block until the message
// has been sent to the remote peer.
SendMessage(sync bool, msg ...lnwire.Message) error
// SendMessage sends a variadic number of high-priority message to
// remote peer. The first argument denotes if the method should block
// until the messages have been sent to the remote peer or an error is
// returned, otherwise it returns immediately after queuing.
SendMessage(sync bool, msgs ...lnwire.Message) error
// SendMessageLazy sends a variadic number of low-priority message to
// remote peer. The first argument denotes if the method should block
// until the messages have been sent to the remote peer or an error is
// returned, otherwise it returns immediately after queueing.
SendMessageLazy(sync bool, msgs ...lnwire.Message) error
// AddNewChannel adds a new channel to the peer. The channel should fail
// to be added if the cancel channel is closed.

105
peer.go
View File

@ -64,8 +64,9 @@ const (
// a buffered channel which will be sent upon once the write is complete. This
// buffered channel acts as a semaphore to be used for synchronization purposes.
type outgoingMsg struct {
msg lnwire.Message
errChan chan error // MUST be buffered.
priority bool
msg lnwire.Message
errChan chan error // MUST be buffered.
}
// newChannelMsg packages a channeldb.OpenChannel with a channel that allows
@ -1479,24 +1480,45 @@ out:
func (p *peer) queueHandler() {
defer p.wg.Done()
// pendingMsgs will hold all messages waiting to be added
// to the sendQueue.
pendingMsgs := list.New()
// priorityMsgs holds an in order list of messages deemed high-priority
// to be added to the sendQueue. This predominately includes messages
// from the funding manager and htlcswitch.
priorityMsgs := list.New()
// lazyMsgs holds an in order list of messages deemed low-priority to be
// added to the sendQueue only after all high-priority messages have
// been queued. This predominately includes messages from the gossiper.
lazyMsgs := list.New()
for {
// Examine the front of the queue.
elem := pendingMsgs.Front()
// Examine the front of the priority queue, if it is empty check
// the low priority queue.
elem := priorityMsgs.Front()
if elem == nil {
elem = lazyMsgs.Front()
}
if elem != nil {
front := elem.Value.(outgoingMsg)
// There's an element on the queue, try adding
// it to the sendQueue. We also watch for
// messages on the outgoingQueue, in case the
// writeHandler cannot accept messages on the
// sendQueue.
select {
case p.sendQueue <- elem.Value.(outgoingMsg):
pendingMsgs.Remove(elem)
case p.sendQueue <- front:
if front.priority {
priorityMsgs.Remove(elem)
} else {
lazyMsgs.Remove(elem)
}
case msg := <-p.outgoingQueue:
pendingMsgs.PushBack(msg)
if msg.priority {
priorityMsgs.PushBack(msg)
} else {
lazyMsgs.PushBack(msg)
}
case <-p.quit:
return
}
@ -1506,7 +1528,11 @@ func (p *peer) queueHandler() {
// into the queue from outside sub-systems.
select {
case msg := <-p.outgoingQueue:
pendingMsgs.PushBack(msg)
if msg.priority {
priorityMsgs.PushBack(msg)
} else {
lazyMsgs.PushBack(msg)
}
case <-p.quit:
return
}
@ -1544,13 +1570,26 @@ func (p *peer) PingTime() int64 {
return atomic.LoadInt64(&p.pingTime)
}
// queueMsg queues a new lnwire.Message to be eventually sent out on the
// wire. It returns an error if we failed to queue the message. An error
// is sent on errChan if the message fails being sent to the peer, or
// nil otherwise.
// queueMsg adds the lnwire.Message to the back of the high priority send queue.
// If the errChan is non-nil, an error is sent back if the msg failed to queue
// or failed to write, and nil otherwise.
func (p *peer) queueMsg(msg lnwire.Message, errChan chan error) {
p.queue(true, msg, errChan)
}
// queueMsgLazy adds the lnwire.Message to the back of the low priority send
// queue. If the errChan is non-nil, an error is sent back if the msg failed to
// queue or failed to write, and nil otherwise.
func (p *peer) queueMsgLazy(msg lnwire.Message, errChan chan error) {
p.queue(false, msg, errChan)
}
// queue sends a given message to the queueHandler using the passed priority. If
// the errChan is non-nil, an error is sent back if the msg failed to queue or
// failed to write, and nil otherwise.
func (p *peer) queue(priority bool, msg lnwire.Message, errChan chan error) {
select {
case p.outgoingQueue <- outgoingMsg{msg, errChan}:
case p.outgoingQueue <- outgoingMsg{priority, msg, errChan}:
case <-p.quit:
peerLog.Tracef("Peer shutting down, could not enqueue msg.")
if errChan != nil {
@ -2312,16 +2351,38 @@ func (p *peer) resendChanSyncMsg(cid lnwire.ChannelID) error {
return nil
}
// SendMessage sends a variadic number of message to remote peer. The first
// argument denotes if the method should block until the message has been sent
// to the remote peer.
// SendMessage sends a variadic number of high-priority message to remote peer.
// The first argument denotes if the method should block until the messages have
// been sent to the remote peer or an error is returned, otherwise it returns
// immediately after queuing.
//
// NOTE: Part of the lnpeer.Peer interface.
func (p *peer) SendMessage(sync bool, msgs ...lnwire.Message) error {
return p.sendMessage(sync, true, msgs...)
}
// SendMessageLazy sends a variadic number of low-priority message to remote
// peer. The first argument denotes if the method should block until the
// messages have been sent to the remote peer or an error is returned, otherwise
// it returns immediately after queueing.
//
// NOTE: Part of the lnpeer.Peer interface.
func (p *peer) SendMessageLazy(sync bool, msgs ...lnwire.Message) error {
return p.sendMessage(sync, false, msgs...)
}
// sendMessage queues a variadic number of messages using the passed priority
// to the remote peer. If sync is true, this method will block until the
// messages have been sent to the remote peer or an error is returned, otherwise
// it returns immediately after queueing.
func (p *peer) sendMessage(sync, priority bool, msgs ...lnwire.Message) error {
// Add all incoming messages to the outgoing queue. A list of error
// chans is populated for each message if the caller requested a sync
// send.
var errChans []chan error
if sync {
errChans = make([]chan error, 0, len(msgs))
}
for _, msg := range msgs {
// If a sync send was requested, create an error chan to listen
// for an ack from the writeHandler.
@ -2331,7 +2392,11 @@ func (p *peer) SendMessage(sync bool, msgs ...lnwire.Message) error {
errChans = append(errChans, errChan)
}
p.queueMsg(msg, errChan)
if priority {
p.queueMsg(msg, errChan)
} else {
p.queueMsgLazy(msg, errChan)
}
}
// Wait for all replies from the writeHandler. For async sends, this

106
server.go
View File

@ -1884,6 +1884,8 @@ func (s *server) prunePersistentPeerConnection(compressedPubKey [33]byte) {
// BroadcastMessage sends a request to the server to broadcast a set of
// messages to all peers other than the one specified by the `skips` parameter.
// All messages sent via BroadcastMessage will be queued for lazy delivery to
// the target peers.
//
// NOTE: This function is safe for concurrent access.
func (s *server) BroadcastMessage(skips map[routing.Vertex]struct{},
@ -1916,7 +1918,12 @@ func (s *server) BroadcastMessage(skips map[routing.Vertex]struct{},
// Dispatch a go routine to enqueue all messages to this peer.
wg.Add(1)
s.wg.Add(1)
go s.sendPeerMessages(sPeer, msgs, &wg)
go func(p lnpeer.Peer) {
defer s.wg.Done()
defer wg.Done()
p.SendMessageLazy(false, msgs...)
}(sPeer)
}
// Wait for all messages to have been dispatched before returning to
@ -1926,53 +1933,6 @@ func (s *server) BroadcastMessage(skips map[routing.Vertex]struct{},
return nil
}
// SendToPeer send a message to the server telling it to send the specific set
// of message to a particular peer. If the peer connect be found, then this
// method will return a non-nil error.
//
// NOTE: This function is safe for concurrent access.
func (s *server) SendToPeer(target *btcec.PublicKey,
msgs ...lnwire.Message) error {
// Compute the target peer's identifier.
targetPubBytes := target.SerializeCompressed()
srvrLog.Tracef("Attempting to send msgs %v to: %x",
len(msgs), targetPubBytes)
// Lookup intended target in peersByPub, returning an error to the
// caller if the peer is unknown. Access to peersByPub is synchronized
// here to ensure we consider the exact set of peers present at the
// time of invocation.
s.mu.RLock()
targetPeer, err := s.findPeerByPubStr(string(targetPubBytes))
s.mu.RUnlock()
if err == ErrPeerNotConnected {
srvrLog.Errorf("unable to send message to %x, "+
"peer is not connected", targetPubBytes)
return err
}
// Send messages to the peer and get the error channels that will be
// signaled by the peer's write handler.
errChans := s.sendPeerMessages(targetPeer, msgs, nil)
// With the server's shared lock released, we now handle all of the
// errors being returned from the target peer's write handler.
for _, errChan := range errChans {
select {
case err := <-errChan:
return err
case <-targetPeer.quit:
return ErrPeerExiting
case <-s.quit:
return ErrServerShuttingDown
}
}
return nil
}
// NotifyWhenOnline can be called by other subsystems to get notified when a
// particular peer comes online. The peer itself is sent across the peerChan.
//
@ -2036,56 +1996,6 @@ func (s *server) NotifyWhenOffline(peerPubKey [33]byte) <-chan struct{} {
return c
}
// sendPeerMessages enqueues a list of messages into the outgoingQueue of the
// `targetPeer`. This method supports additional broadcast-level
// synchronization by using the additional `wg` to coordinate a particular
// broadcast. Since this method will wait for the return error from sending
// each message, it should be run as a goroutine (see comment below) and
// the error ignored if used for broadcasting messages, where the result
// from sending the messages is not of importance.
//
// NOTE: This method must be invoked with a non-nil `wg` if it is spawned as a
// go routine--both `wg` and the server's WaitGroup should be incremented
// beforehand. If this method is not spawned as a go routine, the provided
// `wg` should be nil, and the server's WaitGroup should not be tracking this
// invocation.
func (s *server) sendPeerMessages(
targetPeer *peer,
msgs []lnwire.Message,
wg *sync.WaitGroup) []chan error {
// If a WaitGroup is provided, we assume that this method was spawned
// as a go routine, and that it is being tracked by both the server's
// WaitGroup, as well as the broadcast-level WaitGroup `wg`. In this
// event, we defer a call to Done on both WaitGroups to 1) ensure that
// server will be able to shutdown after its go routines exit, and 2)
// so the server can return to the caller of BroadcastMessage.
isBroadcast := wg != nil
if isBroadcast {
defer s.wg.Done()
defer wg.Done()
}
// We queue each message, creating a slice of error channels that
// can be inspected after every message is successfully added to
// the queue.
var errChans []chan error
for _, msg := range msgs {
// If this is not broadcast, create error channels to provide
// synchronous feedback regarding the delivery of the message to
// a specific peer.
var errChan chan error
if !isBroadcast {
errChan = make(chan error, 1)
errChans = append(errChans, errChan)
}
targetPeer.queueMsg(msg, errChan)
}
return errChans
}
// FindPeer will return the peer that corresponds to the passed in public key.
// This function is used by the funding manager, allowing it to update the
// daemon's local representation of the remote peer.