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server.go
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server.go
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package main
import (
"bytes"
"crypto/sha256"
"encoding/hex"
"fmt"
"net"
"strconv"
"sync"
"sync/atomic"
"time"
"github.com/boltdb/bolt"
"github.com/lightningnetwork/lightning-onion"
"github.com/lightningnetwork/lnd/autopilot"
"github.com/lightningnetwork/lnd/brontide"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/discovery"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing"
"github.com/roasbeef/btcd/btcec"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/connmgr"
"github.com/roasbeef/btcd/wire"
"github.com/roasbeef/btcutil"
"github.com/go-errors/errors"
"github.com/lightningnetwork/lnd/htlcswitch"
)
var (
// ErrPeerNotFound signals that the server has no connection to the
// given peer.
ErrPeerNotFound = errors.New("unable to find peer")
// ErrServerShuttingDown indicates that the server is in the process of
// gracefully exiting.
ErrServerShuttingDown = errors.New("server is shutting down")
)
// server is the main server of the Lightning Network Daemon. The server houses
// global state pertaining to the wallet, database, and the rpcserver.
// Additionally, the server is also used as a central messaging bus to interact
// with any of its companion objects.
type server struct {
started int32 // atomic
shutdown int32 // atomic
// identityPriv is the private key used to authenticate any incoming
// connections.
identityPriv *btcec.PrivateKey
// nodeSigner is an implementation of the MessageSigner implementation
// that's backed by the identity private key of the running lnd node.
nodeSigner *nodeSigner
// lightningID is the sha256 of the public key corresponding to our
// long-term identity private key.
lightningID [32]byte
mu sync.Mutex
peersByID map[int32]*peer
peersByPub map[string]*peer
inboundPeers map[string]*peer
outboundPeers map[string]*peer
peerConnectedListeners map[string][]chan<- struct{}
persistentPeers map[string]struct{}
persistentConnReqs map[string][]*connmgr.ConnReq
// ignorePeerTermination tracks peers for which the server has initiated
// a disconnect. Adding a peer to this map causes the peer termination
// watcher to short circuit in the event that peers are purposefully
// disconnected.
ignorePeerTermination map[*peer]struct{}
cc *chainControl
fundingMgr *fundingManager
chanDB *channeldb.DB
htlcSwitch *htlcswitch.Switch
invoices *invoiceRegistry
breachArbiter *breachArbiter
chanRouter *routing.ChannelRouter
authGossiper *discovery.AuthenticatedGossiper
utxoNursery *utxoNursery
sphinx *htlcswitch.OnionProcessor
connMgr *connmgr.ConnManager
// globalFeatures feature vector which affects HTLCs and thus are also
// advertised to other nodes.
globalFeatures *lnwire.FeatureVector
// currentNodeAnn is the node announcement that has been broadcast to
// the network upon startup, if the attributes of the node (us) has
// changed since last start.
currentNodeAnn *lnwire.NodeAnnouncement
quit chan struct{}
wg sync.WaitGroup
}
// newServer creates a new instance of the server which is to listen using the
// passed listener address.
func newServer(listenAddrs []string, chanDB *channeldb.DB, cc *chainControl,
privKey *btcec.PrivateKey) (*server, error) {
var err error
listeners := make([]net.Listener, len(listenAddrs))
for i, addr := range listenAddrs {
listeners[i], err = brontide.NewListener(privKey, addr)
if err != nil {
return nil, err
}
}
globalFeatures := lnwire.NewRawFeatureVector()
serializedPubKey := privKey.PubKey().SerializeCompressed()
s := &server{
chanDB: chanDB,
cc: cc,
invoices: newInvoiceRegistry(chanDB),
utxoNursery: newUtxoNursery(chanDB, cc.chainNotifier, cc.wallet),
identityPriv: privKey,
nodeSigner: newNodeSigner(privKey),
// TODO(roasbeef): derive proper onion key based on rotation
// schedule
sphinx: htlcswitch.NewOnionProcessor(
sphinx.NewRouter(privKey, activeNetParams.Params)),
lightningID: sha256.Sum256(serializedPubKey),
persistentPeers: make(map[string]struct{}),
persistentConnReqs: make(map[string][]*connmgr.ConnReq),
ignorePeerTermination: make(map[*peer]struct{}),
peersByID: make(map[int32]*peer),
peersByPub: make(map[string]*peer),
inboundPeers: make(map[string]*peer),
outboundPeers: make(map[string]*peer),
peerConnectedListeners: make(map[string][]chan<- struct{}),
globalFeatures: lnwire.NewFeatureVector(globalFeatures,
lnwire.GlobalFeatures),
quit: make(chan struct{}),
}
// If the debug HTLC flag is on, then we invoice a "master debug"
// invoice which all outgoing payments will be sent and all incoming
// HTLCs with the debug R-Hash immediately settled.
if cfg.DebugHTLC {
kiloCoin := btcutil.Amount(btcutil.SatoshiPerBitcoin * 1000)
s.invoices.AddDebugInvoice(kiloCoin, *debugPre)
srvrLog.Debugf("Debug HTLC invoice inserted, preimage=%x, hash=%x",
debugPre[:], debugHash[:])
}
s.htlcSwitch = htlcswitch.New(htlcswitch.Config{
SelfKey: s.identityPriv.PubKey(),
LocalChannelClose: func(pubKey []byte,
request *htlcswitch.ChanClose) {
peer, err := s.FindPeerByPubStr(string(pubKey))
if err != nil {
srvrLog.Errorf("unable to close channel, peer"+
" with %v id can't be found: %v",
pubKey, err,
)
return
}
select {
case peer.localCloseChanReqs <- request:
srvrLog.Infof("Local close channel request "+
"delivered to peer: %x", pubKey[:])
case <-peer.quit:
srvrLog.Errorf("Unable to deliver local close "+
"channel request to peer %x, err: %v",
pubKey[:], err)
}
},
})
// If external IP addresses have been specified, add those to the list
// of this server's addresses.
selfAddrs := make([]net.Addr, 0, len(cfg.ExternalIPs))
for _, ip := range cfg.ExternalIPs {
var addr string
_, _, err = net.SplitHostPort(ip)
if err != nil {
addr = net.JoinHostPort(ip, strconv.Itoa(defaultPeerPort))
} else {
addr = ip
}
lnAddr, err := net.ResolveTCPAddr("tcp", addr)
if err != nil {
return nil, err
}
selfAddrs = append(selfAddrs, lnAddr)
}
chanGraph := chanDB.ChannelGraph()
// TODO(roasbeef): make alias configurable
alias, err := lnwire.NewNodeAlias(hex.EncodeToString(serializedPubKey[:10]))
if err != nil {
return nil, err
}
selfNode := &channeldb.LightningNode{
HaveNodeAnnouncement: true,
LastUpdate: time.Now(),
Addresses: selfAddrs,
PubKey: privKey.PubKey(),
Alias: alias.String(),
Features: s.globalFeatures,
}
// If our information has changed since our last boot, then we'll
// re-sign our node announcement so a fresh authenticated version of it
// can be propagated throughout the network upon startup.
//
// TODO(roasbeef): don't always set timestamp above to _now.
nodeAnn := &lnwire.NodeAnnouncement{
Timestamp: uint32(selfNode.LastUpdate.Unix()),
Addresses: selfNode.Addresses,
NodeID: selfNode.PubKey,
Alias: alias,
Features: selfNode.Features.RawFeatureVector,
}
selfNode.AuthSig, err = discovery.SignAnnouncement(s.nodeSigner,
s.identityPriv.PubKey(), nodeAnn,
)
if err != nil {
return nil, fmt.Errorf("unable to generate signature for "+
"self node announcement: %v", err)
}
if err := chanGraph.SetSourceNode(selfNode); err != nil {
return nil, fmt.Errorf("can't set self node: %v", err)
}
nodeAnn.Signature = selfNode.AuthSig
s.currentNodeAnn = nodeAnn
s.chanRouter, err = routing.New(routing.Config{
Graph: chanGraph,
Chain: cc.chainIO,
ChainView: cc.chainView,
SendToSwitch: func(firstHop *btcec.PublicKey,
htlcAdd *lnwire.UpdateAddHTLC,
circuit *sphinx.Circuit) ([32]byte, error) {
// Using the created circuit, initialize the error
// decrypter so we can parse+decode any failures
// incurred by this payment within the switch.
errorDecryptor := &htlcswitch.SphinxErrorDecrypter{
OnionErrorDecrypter: sphinx.NewOnionErrorDecrypter(circuit),
}
var firstHopPub [33]byte
copy(firstHopPub[:], firstHop.SerializeCompressed())
return s.htlcSwitch.SendHTLC(firstHopPub, htlcAdd, errorDecryptor)
},
ChannelPruneExpiry: time.Duration(time.Hour * 24 * 14),
GraphPruneInterval: time.Duration(time.Hour),
})
if err != nil {
return nil, fmt.Errorf("can't create router: %v", err)
}
s.authGossiper, err = discovery.New(discovery.Config{
Router: s.chanRouter,
Notifier: s.cc.chainNotifier,
ChainHash: *activeNetParams.GenesisHash,
Broadcast: s.BroadcastMessage,
SendToPeer: s.SendToPeer,
ProofMatureDelta: 0,
TrickleDelay: time.Millisecond * 300,
RetransmitDelay: time.Minute * 30,
DB: chanDB,
AnnSigner: s.nodeSigner,
},
s.identityPriv.PubKey(),
)
if err != nil {
return nil, err
}
// Construct a closure that wraps the htlcswitch's CloseLink method.
closeLink := func(chanPoint *wire.OutPoint,
closureType htlcswitch.ChannelCloseType) {
// TODO(conner): Properly respect the update and error channels
// returned by CloseLink.
s.htlcSwitch.CloseLink(chanPoint, closureType)
}
s.breachArbiter = newBreachArbiter(&BreachConfig{
Signer: cc.wallet.Cfg.Signer,
DB: chanDB,
PublishTransaction: cc.wallet.PublishTransaction,
Notifier: cc.chainNotifier,
ChainIO: s.cc.chainIO,
Estimator: s.cc.feeEstimator,
CloseLink: closeLink,
Store: newRetributionStore(chanDB),
GenSweepScript: func() ([]byte, error) {
return newSweepPkScript(cc.wallet)
},
})
// Create the connection manager which will be responsible for
// maintaining persistent outbound connections and also accepting new
// incoming connections
cmgr, err := connmgr.New(&connmgr.Config{
Listeners: listeners,
OnAccept: s.InboundPeerConnected,
RetryDuration: time.Second * 5,
TargetOutbound: 100,
GetNewAddress: nil,
Dial: noiseDial(s.identityPriv),
OnConnection: s.OutboundPeerConnected,
})
if err != nil {
return nil, err
}
s.connMgr = cmgr
return s, nil
}
// Started returns true if the server has been started, and false otherwise.
// NOTE: This function is safe for concurrent access.
func (s *server) Started() bool {
return atomic.LoadInt32(&s.started) != 0
}
// Start starts the main daemon server, all requested listeners, and any helper
// goroutines.
// NOTE: This function is safe for concurrent access.
func (s *server) Start() error {
// Already running?
if !atomic.CompareAndSwapInt32(&s.started, 0, 1) {
return nil
}
// Start the notification server. This is used so channel management
// goroutines can be notified when a funding transaction reaches a
// sufficient number of confirmations, or when the input for the
// funding transaction is spent in an attempt at an uncooperative close
// by the counterparty.
if err := s.cc.chainNotifier.Start(); err != nil {
return err
}
if err := s.htlcSwitch.Start(); err != nil {
return err
}
if err := s.utxoNursery.Start(); err != nil {
return err
}
if err := s.breachArbiter.Start(); err != nil {
return err
}
if err := s.authGossiper.Start(); err != nil {
return err
}
if err := s.chanRouter.Start(); err != nil {
return err
}
// With all the relevant sub-systems started, we'll now attempt to
// establish persistent connections to our direct channel collaborators
// within the network.
if err := s.establishPersistentConnections(); err != nil {
return err
}
go s.connMgr.Start()
// If network bootstrapping hasn't been disabled, then we'll configure
// the set of active bootstrappers, and launch a dedicated goroutine to
// maintain a set of persistent connections.
if !cfg.NoNetBootstrap && !(cfg.Bitcoin.SimNet || cfg.Litecoin.SimNet) {
networkBootStrappers, err := initNetworkBootstrappers(s)
if err != nil {
return err
}
s.wg.Add(1)
go s.peerBootstrapper(3, networkBootStrappers)
} else {
srvrLog.Infof("Auto peer bootstrapping is disabled")
}
return nil
}
// Stop gracefully shutsdown the main daemon server. This function will signal
// any active goroutines, or helper objects to exit, then blocks until they've
// all successfully exited. Additionally, any/all listeners are closed.
// NOTE: This function is safe for concurrent access.
func (s *server) Stop() error {
// Bail if we're already shutting down.
if !atomic.CompareAndSwapInt32(&s.shutdown, 0, 1) {
return nil
}
close(s.quit)
// Shutdown the wallet, funding manager, and the rpc server.
s.cc.chainNotifier.Stop()
s.chanRouter.Stop()
s.htlcSwitch.Stop()
s.utxoNursery.Stop()
s.breachArbiter.Stop()
s.authGossiper.Stop()
s.cc.wallet.Shutdown()
s.cc.chainView.Stop()
s.connMgr.Stop()
// Disconnect from each active peers to ensure that
// peerTerminationWatchers signal completion to each peer.
for _, peer := range s.Peers() {
s.DisconnectPeer(peer.addr.IdentityKey)
}
// Wait for all lingering goroutines to quit.
s.wg.Wait()
return nil
}
// Stopped returns true if the server has been instructed to shutdown.
// NOTE: This function is safe for concurrent access.
func (s *server) Stopped() bool {
return atomic.LoadInt32(&s.shutdown) != 0
}
// WaitForShutdown blocks until all goroutines have been stopped.
func (s *server) WaitForShutdown() {
s.wg.Wait()
}
// initNetworkBootstrappers initializes a set of network peer bootstrappers
// based on the server, and currently active bootstrap mechanisms as defined
// within the current configuration.
func initNetworkBootstrappers(s *server) ([]discovery.NetworkPeerBootstrapper, error) {
srvrLog.Infof("Initializing peer network boostrappers!")
var bootStrappers []discovery.NetworkPeerBootstrapper
// First, we'll create an instance of the ChannelGraphBootstrapper as
// this can be used by default if we've already partially seeded the
// network.
chanGraph := autopilot.ChannelGraphFromDatabase(s.chanDB.ChannelGraph())
graphBootstrapper, err := discovery.NewGraphBootstrapper(chanGraph)
if err != nil {
return nil, err
}
bootStrappers = append(bootStrappers, graphBootstrapper)
// If this isn't simnet mode, then one of our additional bootstrapping
// sources will be the set of running DNS seeds.
if !cfg.Bitcoin.SimNet || !cfg.Litecoin.SimNet {
chainHash := reverseChainMap[registeredChains.PrimaryChain()]
dnsSeeds, ok := chainDNSSeeds[chainHash]
// If we have a set of DNS seeds for this chain, then we'll add
// it as an additional boostrapping source.
if ok {
srvrLog.Infof("Creating DNS peer boostrapper with "+
"seeds: %v", dnsSeeds)
dnsBootStrapper, err := discovery.NewDNSSeedBootstrapper(
dnsSeeds,
)
if err != nil {
return nil, err
}
bootStrappers = append(bootStrappers, dnsBootStrapper)
}
}
return bootStrappers, nil
}
// peerBootstrapper is a goroutine which is tasked with attempting to establish
// and maintain a target min number of outbound connections. With this
// invariant, we ensure that our node is connected to a diverse set of peers
// and that nodes newly joining the network receive an up to date network view
// as soon as possible.
func (s *server) peerBootstrapper(numTargetPeers uint32,
bootStrappers []discovery.NetworkPeerBootstrapper) {
defer s.wg.Done()
// To kick things off, we'll attempt to first query the set of
// bootstrappers for enough address to fill our quot.
bootStrapAddrs, err := discovery.MultiSourceBootstrap(
nil, numTargetPeers, bootStrappers...,
)
if err != nil {
// TODO(roasbeef): panic?
srvrLog.Errorf("Unable to retrieve initial bootstrap "+
"peers: %v", err)
return
}
srvrLog.Debugf("Attempting to bootstrap connectivity with %v initial "+
"peers", len(bootStrapAddrs))
// With our initial set of peers obtained, we'll launch a goroutine to
// attempt to connect out to each of them. We'll be waking up shortly
// below to sample how many of these connections succeeded.
for _, addr := range bootStrapAddrs {
go func(a *lnwire.NetAddress) {
conn, err := brontide.Dial(s.identityPriv, a)
if err != nil {
srvrLog.Errorf("unable to connect to %v: %v",
a, err)
return
}
s.OutboundPeerConnected(nil, conn)
}(addr)
}
// We'll start with a 15 second backoff, and double the time every time
// an epoch fails up to a ceiling.
const backOffCeliing = time.Minute * 5
backOff := time.Second * 15
// We'll create a new ticker to wake us up every 15 seconds so we can
// see if we've reached our minimum number of peers.
sampleTicker := time.NewTicker(backOff)
defer sampleTicker.Stop()
// We'll use the number of attempts and errors to determine if we need
// to increase the time between discovery epochs.
var epochErrors, epochAttempts uint32
for {
select {
// The ticker has just woken us up, so we'll need to check if
// we need to attempt to connect our to any more peers.
case <-sampleTicker.C:
// Obtain the current number of peers, so we can gauge
// if we need to sample more peers or not.
s.mu.Lock()
numActivePeers := uint32(len(s.peersByPub))
s.mu.Unlock()
// If we have enough peers, then we can loop back
// around to the next round as we're done here.
if numActivePeers >= numTargetPeers {
continue
}
// If all of our attempts failed during this last back
// off period, then will increase our backoff to 5
// minute ceiling to avoid an excessive number of
// queries
//
// TODO(roasbeef): add reverse policy too?
if epochAttempts > 0 &&
atomic.LoadUint32(&epochErrors) >= epochAttempts {
sampleTicker.Stop()
backOff *= 2
if backOff > backOffCeliing {
backOff = backOffCeliing
}
srvrLog.Debugf("Backing off peer bootstrapper to "+
"%v", backOff)
sampleTicker = time.NewTicker(backOff)
continue
}
atomic.StoreUint32(&epochErrors, 0)
epochAttempts = 0
// Since we know need more peers, we'll compute the
// exact number we need to reach our threshold.
numNeeded := numTargetPeers - numActivePeers
srvrLog.Debugf("Attempting to obtain %v more network "+
"peers", numNeeded)
// With the number of peers we need calculated, we'll
// query the network bootstrappers to sample a set of
// random addrs for us.
s.mu.Lock()
ignoreList := make(map[autopilot.NodeID]struct{})
for _, peer := range s.peersByPub {
nID := autopilot.NewNodeID(peer.addr.IdentityKey)
ignoreList[nID] = struct{}{}
}
s.mu.Unlock()
peerAddrs, err := discovery.MultiSourceBootstrap(
ignoreList, numNeeded*2, bootStrappers...,
)
if err != nil {
srvrLog.Errorf("Unable to retrieve bootstrap "+
"peers: %v", err)
continue
}
// Finally, we'll launch a new goroutine for each
// prospective peer candidates.
for _, addr := range peerAddrs {
epochAttempts++
go func(a *lnwire.NetAddress) {
// TODO(roasbeef): can do AS, subnet,
// country diversity, etc
conn, err := brontide.Dial(s.identityPriv, a)
if err != nil {
srvrLog.Errorf("unable to connect "+
"to %v: %v", a, err)
atomic.AddUint32(&epochErrors, 1)
return
}
s.OutboundPeerConnected(nil, conn)
}(addr)
}
case <-s.quit:
return
}
}
}
// genNodeAnnouncement generates and returns the current fully signed node
// announcement. If refresh is true, then the time stamp of the announcement
// will be updated in order to ensure it propagates through the network.
func (s *server) genNodeAnnouncement(
refresh bool) (lnwire.NodeAnnouncement, error) {
s.mu.Lock()
defer s.mu.Unlock()
if !refresh {
return *s.currentNodeAnn, nil
}
var err error
newStamp := uint32(time.Now().Unix())
if newStamp <= s.currentNodeAnn.Timestamp {
newStamp = s.currentNodeAnn.Timestamp + 1
}
s.currentNodeAnn.Timestamp = newStamp
s.currentNodeAnn.Signature, err = discovery.SignAnnouncement(
s.nodeSigner, s.identityPriv.PubKey(), s.currentNodeAnn,
)
return *s.currentNodeAnn, err
}
type nodeAddresses struct {
pubKey *btcec.PublicKey
addresses []*net.TCPAddr
}
// establishPersistentConnections attempts to establish persistent connections
// to all our direct channel collaborators. In order to promote liveness of
// our active channels, we instruct the connection manager to attempt to
// establish and maintain persistent connections to all our direct channel
// counterparties.
func (s *server) establishPersistentConnections() error {
// nodeAddrsMap stores the combination of node public keys and
// addresses that we'll attempt to reconnect to. PubKey strings are
// used as keys since other PubKey forms can't be compared.
nodeAddrsMap := map[string]*nodeAddresses{}
// Iterate through the list of LinkNodes to find addresses we should
// attempt to connect to based on our set of previous connections. Set
// the reconnection port to the default peer port.
linkNodes, err := s.chanDB.FetchAllLinkNodes()
if err != nil && err != channeldb.ErrLinkNodesNotFound {
return err
}
for _, node := range linkNodes {
for _, address := range node.Addresses {
if address.Port == 0 {
address.Port = defaultPeerPort
}
}
pubStr := string(node.IdentityPub.SerializeCompressed())
nodeAddrs := &nodeAddresses{
pubKey: node.IdentityPub,
addresses: node.Addresses,
}
nodeAddrsMap[pubStr] = nodeAddrs
}
// After checking our previous connections for addresses to connect to,
// iterate through the nodes in our channel graph to find addresses
// that have been added via NodeAnnouncement messages.
chanGraph := s.chanDB.ChannelGraph()
sourceNode, err := chanGraph.SourceNode()
if err != nil {
return err
}
// TODO(roasbeef): instead iterate over link nodes and query graph for
// each of the nodes.
err = sourceNode.ForEachChannel(nil, func(
_ *bolt.Tx,
_ *channeldb.ChannelEdgeInfo,
policy, _ *channeldb.ChannelEdgePolicy) error {
pubStr := string(policy.Node.PubKey.SerializeCompressed())
// Add addresses from channel graph/NodeAnnouncements to the
// list of addresses we'll connect to. If there are duplicates
// that have different ports specified, the port from the
// channel graph should supersede the port from the link node.
var addrs []*net.TCPAddr
linkNodeAddrs, ok := nodeAddrsMap[pubStr]
if ok {
for _, lnAddress := range linkNodeAddrs.addresses {
var addrMatched bool
for _, polAddress := range policy.Node.Addresses {
polTCPAddr, ok := polAddress.(*net.TCPAddr)
if ok && polTCPAddr.IP.Equal(lnAddress.IP) {
addrMatched = true
addrs = append(addrs, polTCPAddr)
}
}
if !addrMatched {
addrs = append(addrs, lnAddress)
}
}
} else {
for _, addr := range policy.Node.Addresses {
polTCPAddr, ok := addr.(*net.TCPAddr)
if ok {
addrs = append(addrs, polTCPAddr)
}
}
}
nodeAddrsMap[pubStr] = &nodeAddresses{
pubKey: policy.Node.PubKey,
addresses: addrs,
}
return nil
})
if err != nil && err != channeldb.ErrGraphNoEdgesFound {
return err
}
// Iterate through the combined list of addresses from prior links and
// node announcements and attempt to reconnect to each node.
for pubStr, nodeAddr := range nodeAddrsMap {
// Add this peer to the set of peers we should maintain a
// persistent connection with.
s.persistentPeers[pubStr] = struct{}{}
for _, address := range nodeAddr.addresses {
// Create a wrapper address which couples the IP and
// the pubkey so the brontide authenticated connection
// can be established.
lnAddr := &lnwire.NetAddress{
IdentityKey: nodeAddr.pubKey,
Address: address,
}
srvrLog.Debugf("Attempting persistent connection to "+
"channel peer %v", lnAddr)
// Send the persistent connection request to the
// connection manager, saving the request itself so we
// can cancel/restart the process as needed.
connReq := &connmgr.ConnReq{
Addr: lnAddr,
Permanent: true,
}
s.persistentConnReqs[pubStr] = append(
s.persistentConnReqs[pubStr], connReq)
go s.connMgr.Connect(connReq)
}
}
return nil
}
// BroadcastMessage sends a request to the server to broadcast a set of
// messages to all peers other than the one specified by the `skip` parameter.
//
// NOTE: This function is safe for concurrent access.
func (s *server) BroadcastMessage(skip *btcec.PublicKey,
msgs ...lnwire.Message) error {
s.mu.Lock()
defer s.mu.Unlock()
return s.broadcastMessages(skip, msgs)
}
// broadcastMessages is an internal method that delivers messages to all active
// peers except the one specified by `skip`.
//
// NOTE: This method MUST be called while the server's mutex is locked.
func (s *server) broadcastMessages(
skip *btcec.PublicKey,
msgs []lnwire.Message) error {
srvrLog.Debugf("Broadcasting %v messages", len(msgs))
// Iterate over all known peers, dispatching a go routine to enqueue
// all messages to each of peers. We synchronize access to peersByPub
// throughout this process to ensure we deliver messages to exact set
// of peers present at the time of invocation.
var wg sync.WaitGroup
for pubStr, sPeer := range s.peersByPub {
if skip != nil && sPeer.addr.IdentityKey.IsEqual(skip) {
srvrLog.Debugf("Skipping %v in broadcast", pubStr)
continue
}
// Dispatch a go routine to enqueue all messages to this peer.
wg.Add(1)
s.wg.Add(1)
go s.sendPeerMessages(sPeer, msgs, &wg)
}
// Wait for all messages to have been dispatched before returning to
// caller.
wg.Wait()
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 {
s.mu.Lock()
defer s.mu.Unlock()
return s.sendToPeer(target, msgs)
}
// NotifyWhenOnline can be called by other subsystems to get notified when a
// particular peer comes online.
//
// NOTE: This function is safe for concurrent access.
func (s *server) NotifyWhenOnline(peer *btcec.PublicKey,
connectedChan chan<- struct{}) {
s.mu.Lock()
defer s.mu.Unlock()
// Compute the target peer's identifier.
pubStr := string(peer.SerializeCompressed())
// Check if peer is connected.
_, ok := s.peersByPub[pubStr]
if ok {
// Connected, can return early.
srvrLog.Debugf("Notifying that peer %v is online", pubStr)
close(connectedChan)
return
}
// Not connected, store this listener such that it can be notified when
// the peer comes online.
s.peerConnectedListeners[pubStr] = append(
s.peerConnectedListeners[pubStr], connectedChan)
}
// sendToPeer is an internal method that delivers messages to the specified
// `target` peer.
func (s *server) sendToPeer(target *btcec.PublicKey,
msgs []lnwire.Message) error {
// Compute the target peer's identifier.
targetPubBytes := target.SerializeCompressed()
srvrLog.Infof("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.
targetPeer, err := s.findPeerByPubStr(string(targetPubBytes))
if err == ErrPeerNotFound {
srvrLog.Errorf("unable to send message to %x, "+
"peer not found", targetPubBytes)
return err
}
s.sendPeerMessages(targetPeer, msgs, nil)
return nil
}
// 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.
//
// 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) {
// 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.
if wg != nil {
defer s.wg.Done()
defer wg.Done()
}
for _, msg := range msgs {
targetPeer.queueMsg(msg, nil)
}
}
// 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.
//
// NOTE: This function is safe for concurrent access.
func (s *server) FindPeer(peerKey *btcec.PublicKey) (*peer, error) {
s.mu.Lock()
defer s.mu.Unlock()
pubStr := string(peerKey.SerializeCompressed())
return s.findPeerByPubStr(pubStr)
}
// FindPeerByPubStr will return the peer that corresponds to the passed peerID,
// which should be a string representation of the peer's serialized, compressed
// public key.
//
// NOTE: This function is safe for concurrent access.
func (s *server) FindPeerByPubStr(pubStr string) (*peer, error) {
s.mu.Lock()
defer s.mu.Unlock()
return s.findPeerByPubStr(pubStr)
}
// findPeerByPubStr is an internal method that retrieves the specified peer from
// the server's internal state using.
func (s *server) findPeerByPubStr(pubStr string) (*peer, error) {
peer, ok := s.peersByPub[pubStr]
if !ok {
return nil, ErrPeerNotFound
}
return peer, nil
}
// peerTerminationWatcher waits until a peer has been disconnected unexpectedly,
// and then cleans up all resources allocated to the peer, notifies relevant
// sub-systems of its demise, and finally handles re-connecting to the peer if