2641 lines
84 KiB
Go
2641 lines
84 KiB
Go
package discovery
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import (
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"bytes"
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"errors"
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"fmt"
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"sync"
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"time"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/davecgh/go-spew/spew"
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"github.com/lightningnetwork/lnd/chainntnfs"
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"github.com/lightningnetwork/lnd/channeldb"
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"github.com/lightningnetwork/lnd/lnpeer"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/multimutex"
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"github.com/lightningnetwork/lnd/netann"
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"github.com/lightningnetwork/lnd/routing"
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"github.com/lightningnetwork/lnd/routing/route"
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"github.com/lightningnetwork/lnd/ticker"
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)
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var (
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// ErrGossiperShuttingDown is an error that is returned if the gossiper
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// is in the process of being shut down.
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ErrGossiperShuttingDown = errors.New("gossiper is shutting down")
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// ErrGossipSyncerNotFound signals that we were unable to find an active
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// gossip syncer corresponding to a gossip query message received from
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// the remote peer.
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ErrGossipSyncerNotFound = errors.New("gossip syncer not found")
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)
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// optionalMsgFields is a set of optional message fields that external callers
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// can provide that serve useful when processing a specific network
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// announcement.
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type optionalMsgFields struct {
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capacity *btcutil.Amount
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channelPoint *wire.OutPoint
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}
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// apply applies the optional fields within the functional options.
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func (f *optionalMsgFields) apply(optionalMsgFields ...OptionalMsgField) {
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for _, optionalMsgField := range optionalMsgFields {
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optionalMsgField(f)
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}
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}
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// OptionalMsgField is a functional option parameter that can be used to provide
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// external information that is not included within a network message but serves
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// useful when processing it.
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type OptionalMsgField func(*optionalMsgFields)
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// ChannelCapacity is an optional field that lets the gossiper know of the
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// capacity of a channel.
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func ChannelCapacity(capacity btcutil.Amount) OptionalMsgField {
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return func(f *optionalMsgFields) {
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f.capacity = &capacity
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}
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}
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// ChannelPoint is an optional field that lets the gossiper know of the outpoint
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// of a channel.
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func ChannelPoint(op wire.OutPoint) OptionalMsgField {
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return func(f *optionalMsgFields) {
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f.channelPoint = &op
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}
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}
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// networkMsg couples a routing related wire message with the peer that
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// originally sent it.
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type networkMsg struct {
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peer lnpeer.Peer
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source *btcec.PublicKey
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msg lnwire.Message
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optionalMsgFields *optionalMsgFields
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isRemote bool
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err chan error
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}
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// chanPolicyUpdateRequest is a request that is sent to the server when a caller
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// wishes to update a particular set of channels. New ChannelUpdate messages
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// will be crafted to be sent out during the next broadcast epoch and the fee
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// updates committed to the lower layer.
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type chanPolicyUpdateRequest struct {
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edgesToUpdate []EdgeWithInfo
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errChan chan error
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}
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// Config defines the configuration for the service. ALL elements within the
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// configuration MUST be non-nil for the service to carry out its duties.
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type Config struct {
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// ChainHash is a hash that indicates which resident chain of the
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// AuthenticatedGossiper. Any announcements that don't match this
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// chain hash will be ignored.
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//
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// TODO(roasbeef): eventually make into map so can de-multiplex
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// incoming announcements
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// * also need to do same for Notifier
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ChainHash chainhash.Hash
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// Router is the subsystem which is responsible for managing the
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// topology of lightning network. After incoming channel, node, channel
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// updates announcements are validated they are sent to the router in
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// order to be included in the LN graph.
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Router routing.ChannelGraphSource
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// ChanSeries is an interfaces that provides access to a time series
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// view of the current known channel graph. Each GossipSyncer enabled
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// peer will utilize this in order to create and respond to channel
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// graph time series queries.
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ChanSeries ChannelGraphTimeSeries
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// Notifier is used for receiving notifications of incoming blocks.
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// With each new incoming block found we process previously premature
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// announcements.
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//
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// TODO(roasbeef): could possibly just replace this with an epoch
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// channel.
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Notifier chainntnfs.ChainNotifier
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// Broadcast broadcasts a particular set of announcements to all peers
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// that the daemon is connected to. If supplied, the exclude parameter
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// indicates that the target peer should be excluded from the
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// broadcast.
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Broadcast func(skips map[route.Vertex]struct{},
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msg ...lnwire.Message) error
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// NotifyWhenOnline is a function that allows the gossiper to be
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// notified when a certain peer comes online, allowing it to
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// retry sending a peer message.
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//
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// NOTE: The peerChan channel must be buffered.
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NotifyWhenOnline func(peerPubKey [33]byte, peerChan chan<- lnpeer.Peer)
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// NotifyWhenOffline is a function that allows the gossiper to be
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// notified when a certain peer disconnects, allowing it to request a
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// notification for when it reconnects.
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NotifyWhenOffline func(peerPubKey [33]byte) <-chan struct{}
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// SelfNodeAnnouncement is a function that fetches our own current node
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// announcement, for use when determining whether we should update our
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// peers about our presence on the network. If the refresh is true, a
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// new and updated announcement will be returned.
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SelfNodeAnnouncement func(refresh bool) (lnwire.NodeAnnouncement, error)
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// ProofMatureDelta the number of confirmations which is needed before
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// exchange the channel announcement proofs.
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ProofMatureDelta uint32
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// TrickleDelay the period of trickle timer which flushes to the
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// network the pending batch of new announcements we've received since
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// the last trickle tick.
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TrickleDelay time.Duration
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// RetransmitTicker is a ticker that ticks with a period which
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// indicates that we should check if we need re-broadcast any of our
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// personal channels.
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RetransmitTicker ticker.Ticker
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// RebroadcastInterval is the maximum time we wait between sending out
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// channel updates for our active channels and our own node
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// announcement. We do this to ensure our active presence on the
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// network is known, and we are not being considered a zombie node or
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// having zombie channels.
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RebroadcastInterval time.Duration
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// WaitingProofStore is a persistent storage of partial channel proof
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// announcement messages. We use it to buffer half of the material
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// needed to reconstruct a full authenticated channel announcement.
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// Once we receive the other half the channel proof, we'll be able to
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// properly validate it and re-broadcast it out to the network.
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//
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// TODO(wilmer): make interface to prevent channeldb dependency.
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WaitingProofStore *channeldb.WaitingProofStore
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// MessageStore is a persistent storage of gossip messages which we will
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// use to determine which messages need to be resent for a given peer.
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MessageStore GossipMessageStore
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// AnnSigner is an instance of the MessageSigner interface which will
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// be used to manually sign any outgoing channel updates. The signer
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// implementation should be backed by the public key of the backing
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// Lightning node.
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//
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// TODO(roasbeef): extract ann crafting + sign from fundingMgr into
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// here?
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AnnSigner lnwallet.MessageSigner
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// NumActiveSyncers is the number of peers for which we should have
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// active syncers with. After reaching NumActiveSyncers, any future
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// gossip syncers will be passive.
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NumActiveSyncers int
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// RotateTicker is a ticker responsible for notifying the SyncManager
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// when it should rotate its active syncers. A single active syncer with
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// a chansSynced state will be exchanged for a passive syncer in order
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// to ensure we don't keep syncing with the same peers.
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RotateTicker ticker.Ticker
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// HistoricalSyncTicker is a ticker responsible for notifying the
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// syncManager when it should attempt a historical sync with a gossip
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// sync peer.
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HistoricalSyncTicker ticker.Ticker
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// ActiveSyncerTimeoutTicker is a ticker responsible for notifying the
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// syncManager when it should attempt to start the next pending
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// activeSyncer due to the current one not completing its state machine
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// within the timeout.
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ActiveSyncerTimeoutTicker ticker.Ticker
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// MinimumBatchSize is minimum size of a sub batch of announcement
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// messages.
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MinimumBatchSize int
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// SubBatchDelay is the delay between sending sub batches of
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// gossip messages.
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SubBatchDelay time.Duration
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// IgnoreHistoricalFilters will prevent syncers from replying with
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// historical data when the remote peer sets a gossip_timestamp_range.
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// This prevents ranges with old start times from causing us to dump the
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// graph on connect.
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IgnoreHistoricalFilters bool
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}
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// AuthenticatedGossiper is a subsystem which is responsible for receiving
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// announcements, validating them and applying the changes to router, syncing
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// lightning network with newly connected nodes, broadcasting announcements
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// after validation, negotiating the channel announcement proofs exchange and
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// handling the premature announcements. All outgoing announcements are
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// expected to be properly signed as dictated in BOLT#7, additionally, all
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// incoming message are expected to be well formed and signed. Invalid messages
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// will be rejected by this struct.
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type AuthenticatedGossiper struct {
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// Parameters which are needed to properly handle the start and stop of
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// the service.
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started sync.Once
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stopped sync.Once
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// bestHeight is the height of the block at the tip of the main chain
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// as we know it. Accesses *MUST* be done with the gossiper's lock
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// held.
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bestHeight uint32
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quit chan struct{}
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wg sync.WaitGroup
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// cfg is a copy of the configuration struct that the gossiper service
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// was initialized with.
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cfg *Config
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// blockEpochs encapsulates a stream of block epochs that are sent at
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// every new block height.
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blockEpochs *chainntnfs.BlockEpochEvent
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// prematureAnnouncements maps a block height to a set of network
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// messages which are "premature" from our PoV. A message is premature
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// if it claims to be anchored in a block which is beyond the current
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// main chain tip as we know it. Premature network messages will be
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// processed once the chain tip as we know it extends to/past the
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// premature height.
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//
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// TODO(roasbeef): limit premature networkMsgs to N
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prematureAnnouncements map[uint32][]*networkMsg
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// prematureChannelUpdates is a map of ChannelUpdates we have received
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// that wasn't associated with any channel we know about. We store
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// them temporarily, such that we can reprocess them when a
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// ChannelAnnouncement for the channel is received.
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prematureChannelUpdates map[uint64][]*networkMsg
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pChanUpdMtx sync.Mutex
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// networkMsgs is a channel that carries new network broadcasted
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// message from outside the gossiper service to be processed by the
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// networkHandler.
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networkMsgs chan *networkMsg
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// chanPolicyUpdates is a channel that requests to update the
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// forwarding policy of a set of channels is sent over.
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chanPolicyUpdates chan *chanPolicyUpdateRequest
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// selfKey is the identity public key of the backing Lightning node.
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selfKey *btcec.PublicKey
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// channelMtx is used to restrict the database access to one
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// goroutine per channel ID. This is done to ensure that when
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// the gossiper is handling an announcement, the db state stays
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// consistent between when the DB is first read until it's written.
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channelMtx *multimutex.Mutex
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rejectMtx sync.RWMutex
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recentRejects map[uint64]struct{}
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// syncMgr is a subsystem responsible for managing the gossip syncers
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// for peers currently connected. When a new peer is connected, the
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// manager will create its accompanying gossip syncer and determine
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// whether it should have an activeSync or passiveSync sync type based
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// on how many other gossip syncers are currently active. Any activeSync
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// gossip syncers are started in a round-robin manner to ensure we're
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// not syncing with multiple peers at the same time.
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syncMgr *SyncManager
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// reliableSender is a subsystem responsible for handling reliable
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// message send requests to peers. This should only be used for channels
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// that are unadvertised at the time of handling the message since if it
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// is advertised, then peers should be able to get the message from the
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// network.
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reliableSender *reliableSender
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// heightForLastChanUpdate keeps track of the height at which we
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// processed the latest channel update for a specific direction.
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//
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// NOTE: This map must be synchronized with the main
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// AuthenticatedGossiper lock.
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heightForLastChanUpdate map[uint64][2]uint32
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sync.Mutex
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}
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// New creates a new AuthenticatedGossiper instance, initialized with the
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// passed configuration parameters.
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func New(cfg Config, selfKey *btcec.PublicKey) *AuthenticatedGossiper {
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gossiper := &AuthenticatedGossiper{
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selfKey: selfKey,
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cfg: &cfg,
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networkMsgs: make(chan *networkMsg),
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quit: make(chan struct{}),
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chanPolicyUpdates: make(chan *chanPolicyUpdateRequest),
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prematureAnnouncements: make(map[uint32][]*networkMsg),
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prematureChannelUpdates: make(map[uint64][]*networkMsg),
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channelMtx: multimutex.NewMutex(),
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recentRejects: make(map[uint64]struct{}),
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heightForLastChanUpdate: make(map[uint64][2]uint32),
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syncMgr: newSyncManager(&SyncManagerCfg{
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ChainHash: cfg.ChainHash,
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ChanSeries: cfg.ChanSeries,
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RotateTicker: cfg.RotateTicker,
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HistoricalSyncTicker: cfg.HistoricalSyncTicker,
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NumActiveSyncers: cfg.NumActiveSyncers,
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IgnoreHistoricalFilters: cfg.IgnoreHistoricalFilters,
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}),
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}
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gossiper.reliableSender = newReliableSender(&reliableSenderCfg{
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NotifyWhenOnline: cfg.NotifyWhenOnline,
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NotifyWhenOffline: cfg.NotifyWhenOffline,
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MessageStore: cfg.MessageStore,
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IsMsgStale: gossiper.isMsgStale,
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})
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return gossiper
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}
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// EdgeWithInfo contains the information that is required to update an edge.
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type EdgeWithInfo struct {
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// Info describes the channel.
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Info *channeldb.ChannelEdgeInfo
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// Edge describes the policy in one direction of the channel.
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Edge *channeldb.ChannelEdgePolicy
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}
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// PropagateChanPolicyUpdate signals the AuthenticatedGossiper to perform the
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// specified edge updates. Updates are done in two stages: first, the
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// AuthenticatedGossiper ensures the update has been committed by dependent
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// sub-systems, then it signs and broadcasts new updates to the network. A
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// mapping between outpoints and updated channel policies is returned, which is
|
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// used to update the forwarding policies of the underlying links.
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func (d *AuthenticatedGossiper) PropagateChanPolicyUpdate(
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edgesToUpdate []EdgeWithInfo) error {
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|
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errChan := make(chan error, 1)
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policyUpdate := &chanPolicyUpdateRequest{
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edgesToUpdate: edgesToUpdate,
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errChan: errChan,
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}
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select {
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case d.chanPolicyUpdates <- policyUpdate:
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err := <-errChan
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return err
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case <-d.quit:
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return fmt.Errorf("AuthenticatedGossiper shutting down")
|
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}
|
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}
|
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|
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// Start spawns network messages handler goroutine and registers on new block
|
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// notifications in order to properly handle the premature announcements.
|
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func (d *AuthenticatedGossiper) Start() error {
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var err error
|
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d.started.Do(func() {
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err = d.start()
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})
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return err
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}
|
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|
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func (d *AuthenticatedGossiper) start() error {
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log.Info("Authenticated Gossiper is starting")
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|
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// First we register for new notifications of newly discovered blocks.
|
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// We do this immediately so we'll later be able to consume any/all
|
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// blocks which were discovered.
|
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blockEpochs, err := d.cfg.Notifier.RegisterBlockEpochNtfn(nil)
|
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if err != nil {
|
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return err
|
|
}
|
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d.blockEpochs = blockEpochs
|
|
|
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height, err := d.cfg.Router.CurrentBlockHeight()
|
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if err != nil {
|
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return err
|
|
}
|
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d.bestHeight = height
|
|
|
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// Start the reliable sender. In case we had any pending messages ready
|
|
// to be sent when the gossiper was last shut down, we must continue on
|
|
// our quest to deliver them to their respective peers.
|
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if err := d.reliableSender.Start(); err != nil {
|
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return err
|
|
}
|
|
|
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d.syncMgr.Start()
|
|
|
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d.wg.Add(1)
|
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go d.networkHandler()
|
|
|
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return nil
|
|
}
|
|
|
|
// Stop signals any active goroutines for a graceful closure.
|
|
func (d *AuthenticatedGossiper) Stop() {
|
|
d.stopped.Do(d.stop)
|
|
}
|
|
|
|
func (d *AuthenticatedGossiper) stop() {
|
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log.Info("Authenticated Gossiper is stopping")
|
|
|
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d.blockEpochs.Cancel()
|
|
|
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d.syncMgr.Stop()
|
|
|
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close(d.quit)
|
|
d.wg.Wait()
|
|
|
|
// We'll stop our reliable sender after all of the gossiper's goroutines
|
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// have exited to ensure nothing can cause it to continue executing.
|
|
d.reliableSender.Stop()
|
|
}
|
|
|
|
// TODO(roasbeef): need method to get current gossip timestamp?
|
|
// * using mtx, check time rotate forward is needed?
|
|
|
|
// ProcessRemoteAnnouncement sends a new remote announcement message along with
|
|
// the peer that sent the routing message. The announcement will be processed
|
|
// then added to a queue for batched trickled announcement to all connected
|
|
// peers. Remote channel announcements should contain the announcement proof
|
|
// and be fully validated.
|
|
func (d *AuthenticatedGossiper) ProcessRemoteAnnouncement(msg lnwire.Message,
|
|
peer lnpeer.Peer) chan error {
|
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|
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errChan := make(chan error, 1)
|
|
|
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// For messages in the known set of channel series queries, we'll
|
|
// dispatch the message directly to the GossipSyncer, and skip the main
|
|
// processing loop.
|
|
switch m := msg.(type) {
|
|
case *lnwire.QueryShortChanIDs,
|
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*lnwire.QueryChannelRange,
|
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*lnwire.ReplyChannelRange,
|
|
*lnwire.ReplyShortChanIDsEnd:
|
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|
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syncer, ok := d.syncMgr.GossipSyncer(peer.PubKey())
|
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if !ok {
|
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log.Warnf("Gossip syncer for peer=%x not found",
|
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peer.PubKey())
|
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|
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errChan <- ErrGossipSyncerNotFound
|
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return errChan
|
|
}
|
|
|
|
// If we've found the message target, then we'll dispatch the
|
|
// message directly to it.
|
|
syncer.ProcessQueryMsg(m, peer.QuitSignal())
|
|
|
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errChan <- nil
|
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return errChan
|
|
|
|
// If a peer is updating its current update horizon, then we'll dispatch
|
|
// that directly to the proper GossipSyncer.
|
|
case *lnwire.GossipTimestampRange:
|
|
syncer, ok := d.syncMgr.GossipSyncer(peer.PubKey())
|
|
if !ok {
|
|
log.Warnf("Gossip syncer for peer=%x not found",
|
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peer.PubKey())
|
|
|
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errChan <- ErrGossipSyncerNotFound
|
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return errChan
|
|
}
|
|
|
|
// If we've found the message target, then we'll dispatch the
|
|
// message directly to it.
|
|
if err := syncer.ApplyGossipFilter(m); err != nil {
|
|
log.Warnf("Unable to apply gossip filter for peer=%x: "+
|
|
"%v", peer.PubKey(), err)
|
|
|
|
errChan <- err
|
|
return errChan
|
|
}
|
|
|
|
errChan <- nil
|
|
return errChan
|
|
}
|
|
|
|
nMsg := &networkMsg{
|
|
msg: msg,
|
|
isRemote: true,
|
|
peer: peer,
|
|
source: peer.IdentityKey(),
|
|
err: errChan,
|
|
}
|
|
|
|
select {
|
|
case d.networkMsgs <- nMsg:
|
|
|
|
// If the peer that sent us this error is quitting, then we don't need
|
|
// to send back an error and can return immediately.
|
|
case <-peer.QuitSignal():
|
|
return nil
|
|
case <-d.quit:
|
|
nMsg.err <- ErrGossiperShuttingDown
|
|
}
|
|
|
|
return nMsg.err
|
|
}
|
|
|
|
// ProcessLocalAnnouncement sends a new remote announcement message along with
|
|
// the peer that sent the routing message. The announcement will be processed
|
|
// then added to a queue for batched trickled announcement to all connected
|
|
// peers. Local channel announcements don't contain the announcement proof and
|
|
// will not be fully validated. Once the channel proofs are received, the
|
|
// entire channel announcement and update messages will be re-constructed and
|
|
// broadcast to the rest of the network.
|
|
func (d *AuthenticatedGossiper) ProcessLocalAnnouncement(msg lnwire.Message,
|
|
source *btcec.PublicKey, optionalFields ...OptionalMsgField) chan error {
|
|
|
|
optionalMsgFields := &optionalMsgFields{}
|
|
optionalMsgFields.apply(optionalFields...)
|
|
|
|
nMsg := &networkMsg{
|
|
msg: msg,
|
|
optionalMsgFields: optionalMsgFields,
|
|
isRemote: false,
|
|
source: source,
|
|
err: make(chan error, 1),
|
|
}
|
|
|
|
select {
|
|
case d.networkMsgs <- nMsg:
|
|
case <-d.quit:
|
|
nMsg.err <- ErrGossiperShuttingDown
|
|
}
|
|
|
|
return nMsg.err
|
|
}
|
|
|
|
// channelUpdateID is a unique identifier for ChannelUpdate messages, as
|
|
// channel updates can be identified by the (ShortChannelID, ChannelFlags)
|
|
// tuple.
|
|
type channelUpdateID struct {
|
|
// channelID represents the set of data which is needed to
|
|
// retrieve all necessary data to validate the channel existence.
|
|
channelID lnwire.ShortChannelID
|
|
|
|
// Flags least-significant bit must be set to 0 if the creating node
|
|
// corresponds to the first node in the previously sent channel
|
|
// announcement and 1 otherwise.
|
|
flags lnwire.ChanUpdateChanFlags
|
|
}
|
|
|
|
// msgWithSenders is a wrapper struct around a message, and the set of peers
|
|
// that originally sent us this message. Using this struct, we can ensure that
|
|
// we don't re-send a message to the peer that sent it to us in the first
|
|
// place.
|
|
type msgWithSenders struct {
|
|
// msg is the wire message itself.
|
|
msg lnwire.Message
|
|
|
|
// sender is the set of peers that sent us this message.
|
|
senders map[route.Vertex]struct{}
|
|
}
|
|
|
|
// mergeSyncerMap is used to merge the set of senders of a particular message
|
|
// with peers that we have an active GossipSyncer with. We do this to ensure
|
|
// that we don't broadcast messages to any peers that we have active gossip
|
|
// syncers for.
|
|
func (m *msgWithSenders) mergeSyncerMap(syncers map[route.Vertex]*GossipSyncer) {
|
|
for peerPub := range syncers {
|
|
m.senders[peerPub] = struct{}{}
|
|
}
|
|
}
|
|
|
|
// deDupedAnnouncements de-duplicates announcements that have been added to the
|
|
// batch. Internally, announcements are stored in three maps
|
|
// (one each for channel announcements, channel updates, and node
|
|
// announcements). These maps keep track of unique announcements and ensure no
|
|
// announcements are duplicated. We keep the three message types separate, such
|
|
// that we can send channel announcements first, then channel updates, and
|
|
// finally node announcements when it's time to broadcast them.
|
|
type deDupedAnnouncements struct {
|
|
// channelAnnouncements are identified by the short channel id field.
|
|
channelAnnouncements map[lnwire.ShortChannelID]msgWithSenders
|
|
|
|
// channelUpdates are identified by the channel update id field.
|
|
channelUpdates map[channelUpdateID]msgWithSenders
|
|
|
|
// nodeAnnouncements are identified by the Vertex field.
|
|
nodeAnnouncements map[route.Vertex]msgWithSenders
|
|
|
|
sync.Mutex
|
|
}
|
|
|
|
// Reset operates on deDupedAnnouncements to reset the storage of
|
|
// announcements.
|
|
func (d *deDupedAnnouncements) Reset() {
|
|
d.Lock()
|
|
defer d.Unlock()
|
|
|
|
d.reset()
|
|
}
|
|
|
|
// reset is the private version of the Reset method. We have this so we can
|
|
// call this method within method that are already holding the lock.
|
|
func (d *deDupedAnnouncements) reset() {
|
|
// Storage of each type of announcement (channel announcements, channel
|
|
// updates, node announcements) is set to an empty map where the
|
|
// appropriate key points to the corresponding lnwire.Message.
|
|
d.channelAnnouncements = make(map[lnwire.ShortChannelID]msgWithSenders)
|
|
d.channelUpdates = make(map[channelUpdateID]msgWithSenders)
|
|
d.nodeAnnouncements = make(map[route.Vertex]msgWithSenders)
|
|
}
|
|
|
|
// addMsg adds a new message to the current batch. If the message is already
|
|
// present in the current batch, then this new instance replaces the latter,
|
|
// and the set of senders is updated to reflect which node sent us this
|
|
// message.
|
|
func (d *deDupedAnnouncements) addMsg(message networkMsg) {
|
|
// Depending on the message type (channel announcement, channel update,
|
|
// or node announcement), the message is added to the corresponding map
|
|
// in deDupedAnnouncements. Because each identifying key can have at
|
|
// most one value, the announcements are de-duplicated, with newer ones
|
|
// replacing older ones.
|
|
switch msg := message.msg.(type) {
|
|
|
|
// Channel announcements are identified by the short channel id field.
|
|
case *lnwire.ChannelAnnouncement:
|
|
deDupKey := msg.ShortChannelID
|
|
sender := route.NewVertex(message.source)
|
|
|
|
mws, ok := d.channelAnnouncements[deDupKey]
|
|
if !ok {
|
|
mws = msgWithSenders{
|
|
msg: msg,
|
|
senders: make(map[route.Vertex]struct{}),
|
|
}
|
|
mws.senders[sender] = struct{}{}
|
|
|
|
d.channelAnnouncements[deDupKey] = mws
|
|
|
|
return
|
|
}
|
|
|
|
mws.msg = msg
|
|
mws.senders[sender] = struct{}{}
|
|
d.channelAnnouncements[deDupKey] = mws
|
|
|
|
// Channel updates are identified by the (short channel id,
|
|
// channelflags) tuple.
|
|
case *lnwire.ChannelUpdate:
|
|
sender := route.NewVertex(message.source)
|
|
deDupKey := channelUpdateID{
|
|
msg.ShortChannelID,
|
|
msg.ChannelFlags,
|
|
}
|
|
|
|
oldTimestamp := uint32(0)
|
|
mws, ok := d.channelUpdates[deDupKey]
|
|
if ok {
|
|
// If we already have seen this message, record its
|
|
// timestamp.
|
|
oldTimestamp = mws.msg.(*lnwire.ChannelUpdate).Timestamp
|
|
}
|
|
|
|
// If we already had this message with a strictly newer
|
|
// timestamp, then we'll just discard the message we got.
|
|
if oldTimestamp > msg.Timestamp {
|
|
return
|
|
}
|
|
|
|
// If the message we just got is newer than what we previously
|
|
// have seen, or this is the first time we see it, then we'll
|
|
// add it to our map of announcements.
|
|
if oldTimestamp < msg.Timestamp {
|
|
mws = msgWithSenders{
|
|
msg: msg,
|
|
senders: make(map[route.Vertex]struct{}),
|
|
}
|
|
|
|
// We'll mark the sender of the message in the
|
|
// senders map.
|
|
mws.senders[sender] = struct{}{}
|
|
|
|
d.channelUpdates[deDupKey] = mws
|
|
|
|
return
|
|
}
|
|
|
|
// Lastly, if we had seen this exact message from before, with
|
|
// the same timestamp, we'll add the sender to the map of
|
|
// senders, such that we can skip sending this message back in
|
|
// the next batch.
|
|
mws.msg = msg
|
|
mws.senders[sender] = struct{}{}
|
|
d.channelUpdates[deDupKey] = mws
|
|
|
|
// Node announcements are identified by the Vertex field. Use the
|
|
// NodeID to create the corresponding Vertex.
|
|
case *lnwire.NodeAnnouncement:
|
|
sender := route.NewVertex(message.source)
|
|
deDupKey := route.Vertex(msg.NodeID)
|
|
|
|
// We do the same for node announcements as we did for channel
|
|
// updates, as they also carry a timestamp.
|
|
oldTimestamp := uint32(0)
|
|
mws, ok := d.nodeAnnouncements[deDupKey]
|
|
if ok {
|
|
oldTimestamp = mws.msg.(*lnwire.NodeAnnouncement).Timestamp
|
|
}
|
|
|
|
// Discard the message if it's old.
|
|
if oldTimestamp > msg.Timestamp {
|
|
return
|
|
}
|
|
|
|
// Replace if it's newer.
|
|
if oldTimestamp < msg.Timestamp {
|
|
mws = msgWithSenders{
|
|
msg: msg,
|
|
senders: make(map[route.Vertex]struct{}),
|
|
}
|
|
|
|
mws.senders[sender] = struct{}{}
|
|
|
|
d.nodeAnnouncements[deDupKey] = mws
|
|
|
|
return
|
|
}
|
|
|
|
// Add to senders map if it's the same as we had.
|
|
mws.msg = msg
|
|
mws.senders[sender] = struct{}{}
|
|
d.nodeAnnouncements[deDupKey] = mws
|
|
}
|
|
}
|
|
|
|
// AddMsgs is a helper method to add multiple messages to the announcement
|
|
// batch.
|
|
func (d *deDupedAnnouncements) AddMsgs(msgs ...networkMsg) {
|
|
d.Lock()
|
|
defer d.Unlock()
|
|
|
|
for _, msg := range msgs {
|
|
d.addMsg(msg)
|
|
}
|
|
}
|
|
|
|
// Emit returns the set of de-duplicated announcements to be sent out during
|
|
// the next announcement epoch, in the order of channel announcements, channel
|
|
// updates, and node announcements. Each message emitted, contains the set of
|
|
// peers that sent us the message. This way, we can ensure that we don't waste
|
|
// bandwidth by re-sending a message to the peer that sent it to us in the
|
|
// first place. Additionally, the set of stored messages are reset.
|
|
func (d *deDupedAnnouncements) Emit() []msgWithSenders {
|
|
d.Lock()
|
|
defer d.Unlock()
|
|
|
|
// Get the total number of announcements.
|
|
numAnnouncements := len(d.channelAnnouncements) + len(d.channelUpdates) +
|
|
len(d.nodeAnnouncements)
|
|
|
|
// Create an empty array of lnwire.Messages with a length equal to
|
|
// the total number of announcements.
|
|
msgs := make([]msgWithSenders, 0, numAnnouncements)
|
|
|
|
// Add the channel announcements to the array first.
|
|
for _, message := range d.channelAnnouncements {
|
|
msgs = append(msgs, message)
|
|
}
|
|
|
|
// Then add the channel updates.
|
|
for _, message := range d.channelUpdates {
|
|
msgs = append(msgs, message)
|
|
}
|
|
|
|
// Finally add the node announcements.
|
|
for _, message := range d.nodeAnnouncements {
|
|
msgs = append(msgs, message)
|
|
}
|
|
|
|
d.reset()
|
|
|
|
// Return the array of lnwire.messages.
|
|
return msgs
|
|
}
|
|
|
|
// calculateSubBatchSize is a helper function that calculates the size to break
|
|
// down the batchSize into.
|
|
func calculateSubBatchSize(totalDelay, subBatchDelay time.Duration,
|
|
minimumBatchSize, batchSize int) int {
|
|
if subBatchDelay > totalDelay {
|
|
return batchSize
|
|
}
|
|
|
|
subBatchSize := (int(batchSize)*int(subBatchDelay) + int(totalDelay) - 1) /
|
|
int(totalDelay)
|
|
|
|
if subBatchSize < minimumBatchSize {
|
|
return minimumBatchSize
|
|
}
|
|
|
|
return subBatchSize
|
|
}
|
|
|
|
// splitAnnouncementBatches takes an exiting list of announcements and
|
|
// decomposes it into sub batches controlled by the `subBatchSize`.
|
|
func splitAnnouncementBatches(subBatchSize int,
|
|
announcementBatch []msgWithSenders) [][]msgWithSenders {
|
|
var splitAnnouncementBatch [][]msgWithSenders
|
|
|
|
for subBatchSize < len(announcementBatch) {
|
|
// For slicing with minimal allocation
|
|
// https://github.com/golang/go/wiki/SliceTricks
|
|
announcementBatch, splitAnnouncementBatch =
|
|
announcementBatch[subBatchSize:],
|
|
append(splitAnnouncementBatch,
|
|
announcementBatch[0:subBatchSize:subBatchSize])
|
|
}
|
|
splitAnnouncementBatch = append(splitAnnouncementBatch, announcementBatch)
|
|
|
|
return splitAnnouncementBatch
|
|
}
|
|
|
|
// sendBatch broadcasts a list of announcements to our peers.
|
|
func (d *AuthenticatedGossiper) sendBatch(announcementBatch []msgWithSenders) {
|
|
syncerPeers := d.syncMgr.GossipSyncers()
|
|
|
|
// We'll first attempt to filter out this new message
|
|
// for all peers that have active gossip syncers
|
|
// active.
|
|
for _, syncer := range syncerPeers {
|
|
syncer.FilterGossipMsgs(announcementBatch...)
|
|
}
|
|
|
|
for _, msgChunk := range announcementBatch {
|
|
// With the syncers taken care of, we'll merge
|
|
// the sender map with the set of syncers, so
|
|
// we don't send out duplicate messages.
|
|
msgChunk.mergeSyncerMap(syncerPeers)
|
|
|
|
err := d.cfg.Broadcast(
|
|
msgChunk.senders, msgChunk.msg,
|
|
)
|
|
if err != nil {
|
|
log.Errorf("Unable to send batch "+
|
|
"announcements: %v", err)
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
// networkHandler is the primary goroutine that drives this service. The roles
|
|
// of this goroutine includes answering queries related to the state of the
|
|
// network, syncing up newly connected peers, and also periodically
|
|
// broadcasting our latest topology state to all connected peers.
|
|
//
|
|
// NOTE: This MUST be run as a goroutine.
|
|
func (d *AuthenticatedGossiper) networkHandler() {
|
|
defer d.wg.Done()
|
|
|
|
// Initialize empty deDupedAnnouncements to store announcement batch.
|
|
announcements := deDupedAnnouncements{}
|
|
announcements.Reset()
|
|
|
|
d.cfg.RetransmitTicker.Resume()
|
|
defer d.cfg.RetransmitTicker.Stop()
|
|
|
|
trickleTimer := time.NewTicker(d.cfg.TrickleDelay)
|
|
defer trickleTimer.Stop()
|
|
|
|
// To start, we'll first check to see if there are any stale channel or
|
|
// node announcements that we need to re-transmit.
|
|
if err := d.retransmitStaleAnns(time.Now()); err != nil {
|
|
log.Errorf("Unable to rebroadcast stale announcements: %v", err)
|
|
}
|
|
|
|
// We'll use this validation to ensure that we process jobs in their
|
|
// dependency order during parallel validation.
|
|
validationBarrier := routing.NewValidationBarrier(1000, d.quit)
|
|
|
|
for {
|
|
select {
|
|
// A new policy update has arrived. We'll commit it to the
|
|
// sub-systems below us, then craft, sign, and broadcast a new
|
|
// ChannelUpdate for the set of affected clients.
|
|
case policyUpdate := <-d.chanPolicyUpdates:
|
|
// First, we'll now create new fully signed updates for
|
|
// the affected channels and also update the underlying
|
|
// graph with the new state.
|
|
newChanUpdates, err := d.processChanPolicyUpdate(
|
|
policyUpdate.edgesToUpdate,
|
|
)
|
|
policyUpdate.errChan <- err
|
|
if err != nil {
|
|
log.Errorf("Unable to craft policy updates: %v",
|
|
err)
|
|
continue
|
|
}
|
|
|
|
// Finally, with the updates committed, we'll now add
|
|
// them to the announcement batch to be flushed at the
|
|
// start of the next epoch.
|
|
announcements.AddMsgs(newChanUpdates...)
|
|
|
|
case announcement := <-d.networkMsgs:
|
|
// We should only broadcast this message forward if it
|
|
// originated from us or it wasn't received as part of
|
|
// our initial historical sync.
|
|
shouldBroadcast := !announcement.isRemote ||
|
|
d.syncMgr.IsGraphSynced()
|
|
|
|
switch announcement.msg.(type) {
|
|
// Channel announcement signatures are amongst the only
|
|
// messages that we'll process serially.
|
|
case *lnwire.AnnounceSignatures:
|
|
emittedAnnouncements := d.processNetworkAnnouncement(
|
|
announcement,
|
|
)
|
|
if emittedAnnouncements != nil {
|
|
announcements.AddMsgs(
|
|
emittedAnnouncements...,
|
|
)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// If this message was recently rejected, then we won't
|
|
// attempt to re-process it.
|
|
if d.isRecentlyRejectedMsg(announcement.msg) {
|
|
announcement.err <- fmt.Errorf("recently " +
|
|
"rejected")
|
|
continue
|
|
}
|
|
|
|
// We'll set up any dependent, and wait until a free
|
|
// slot for this job opens up, this allow us to not
|
|
// have thousands of goroutines active.
|
|
validationBarrier.InitJobDependencies(announcement.msg)
|
|
|
|
d.wg.Add(1)
|
|
go func() {
|
|
defer d.wg.Done()
|
|
defer validationBarrier.CompleteJob()
|
|
|
|
// If this message has an existing dependency,
|
|
// then we'll wait until that has been fully
|
|
// validated before we proceed.
|
|
err := validationBarrier.WaitForDependants(
|
|
announcement.msg,
|
|
)
|
|
if err != nil {
|
|
if err != routing.ErrVBarrierShuttingDown {
|
|
log.Warnf("unexpected error "+
|
|
"during validation "+
|
|
"barrier shutdown: %v",
|
|
err)
|
|
}
|
|
announcement.err <- err
|
|
return
|
|
}
|
|
|
|
// Process the network announcement to
|
|
// determine if this is either a new
|
|
// announcement from our PoV or an edges to a
|
|
// prior vertex/edge we previously proceeded.
|
|
emittedAnnouncements := d.processNetworkAnnouncement(
|
|
announcement,
|
|
)
|
|
|
|
// If this message had any dependencies, then
|
|
// we can now signal them to continue.
|
|
validationBarrier.SignalDependants(
|
|
announcement.msg,
|
|
)
|
|
|
|
// If the announcement was accepted, then add
|
|
// the emitted announcements to our announce
|
|
// batch to be broadcast once the trickle timer
|
|
// ticks gain.
|
|
if emittedAnnouncements != nil && shouldBroadcast {
|
|
// TODO(roasbeef): exclude peer that
|
|
// sent.
|
|
announcements.AddMsgs(
|
|
emittedAnnouncements...,
|
|
)
|
|
} else if emittedAnnouncements != nil {
|
|
log.Trace("Skipping broadcast of " +
|
|
"announcements received " +
|
|
"during initial graph sync")
|
|
}
|
|
|
|
}()
|
|
|
|
// A new block has arrived, so we can re-process the previously
|
|
// premature announcements.
|
|
case newBlock, ok := <-d.blockEpochs.Epochs:
|
|
// If the channel has been closed, then this indicates
|
|
// the daemon is shutting down, so we exit ourselves.
|
|
if !ok {
|
|
return
|
|
}
|
|
|
|
// Once a new block arrives, we update our running
|
|
// track of the height of the chain tip.
|
|
d.Lock()
|
|
blockHeight := uint32(newBlock.Height)
|
|
d.bestHeight = blockHeight
|
|
|
|
log.Debugf("New block: height=%d, hash=%s", blockHeight,
|
|
newBlock.Hash)
|
|
|
|
// Next we check if we have any premature announcements
|
|
// for this height, if so, then we process them once
|
|
// more as normal announcements.
|
|
premature := d.prematureAnnouncements[blockHeight]
|
|
if len(premature) == 0 {
|
|
d.Unlock()
|
|
continue
|
|
}
|
|
delete(d.prematureAnnouncements, blockHeight)
|
|
d.Unlock()
|
|
|
|
log.Infof("Re-processing %v premature announcements "+
|
|
"for height %v", len(premature), blockHeight)
|
|
|
|
for _, ann := range premature {
|
|
emittedAnnouncements := d.processNetworkAnnouncement(ann)
|
|
if emittedAnnouncements != nil {
|
|
announcements.AddMsgs(
|
|
emittedAnnouncements...,
|
|
)
|
|
}
|
|
}
|
|
|
|
// The trickle timer has ticked, which indicates we should
|
|
// flush to the network the pending batch of new announcements
|
|
// we've received since the last trickle tick.
|
|
case <-trickleTimer.C:
|
|
// Emit the current batch of announcements from
|
|
// deDupedAnnouncements.
|
|
announcementBatch := announcements.Emit()
|
|
|
|
// If the current announcements batch is nil, then we
|
|
// have no further work here.
|
|
if len(announcementBatch) == 0 {
|
|
continue
|
|
}
|
|
|
|
// Next, If we have new things to announce then
|
|
// broadcast them to all our immediately connected
|
|
// peers.
|
|
subBatchSize := calculateSubBatchSize(
|
|
d.cfg.TrickleDelay, d.cfg.SubBatchDelay, d.cfg.MinimumBatchSize,
|
|
len(announcementBatch),
|
|
)
|
|
|
|
splitAnnouncementBatch := splitAnnouncementBatches(
|
|
subBatchSize, announcementBatch,
|
|
)
|
|
|
|
d.wg.Add(1)
|
|
go func() {
|
|
defer d.wg.Done()
|
|
log.Infof("Broadcasting %v new announcements in %d sub batches",
|
|
len(announcementBatch), len(splitAnnouncementBatch))
|
|
|
|
for _, announcementBatch := range splitAnnouncementBatch {
|
|
d.sendBatch(announcementBatch)
|
|
select {
|
|
case <-time.After(d.cfg.SubBatchDelay):
|
|
case <-d.quit:
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
|
|
// The retransmission timer has ticked which indicates that we
|
|
// should check if we need to prune or re-broadcast any of our
|
|
// personal channels or node announcement. This addresses the
|
|
// case of "zombie" channels and channel advertisements that
|
|
// have been dropped, or not properly propagated through the
|
|
// network.
|
|
case tick := <-d.cfg.RetransmitTicker.Ticks():
|
|
if err := d.retransmitStaleAnns(tick); err != nil {
|
|
log.Errorf("unable to rebroadcast stale "+
|
|
"announcements: %v", err)
|
|
}
|
|
|
|
// The gossiper has been signalled to exit, to we exit our
|
|
// main loop so the wait group can be decremented.
|
|
case <-d.quit:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO(roasbeef): d/c peers that send updates not on our chain
|
|
|
|
// InitSyncState is called by outside sub-systems when a connection is
|
|
// established to a new peer that understands how to perform channel range
|
|
// queries. We'll allocate a new gossip syncer for it, and start any goroutines
|
|
// needed to handle new queries.
|
|
func (d *AuthenticatedGossiper) InitSyncState(syncPeer lnpeer.Peer) {
|
|
d.syncMgr.InitSyncState(syncPeer)
|
|
}
|
|
|
|
// PruneSyncState is called by outside sub-systems once a peer that we were
|
|
// previously connected to has been disconnected. In this case we can stop the
|
|
// existing GossipSyncer assigned to the peer and free up resources.
|
|
func (d *AuthenticatedGossiper) PruneSyncState(peer route.Vertex) {
|
|
d.syncMgr.PruneSyncState(peer)
|
|
}
|
|
|
|
// isRecentlyRejectedMsg returns true if we recently rejected a message, and
|
|
// false otherwise, This avoids expensive reprocessing of the message.
|
|
func (d *AuthenticatedGossiper) isRecentlyRejectedMsg(msg lnwire.Message) bool {
|
|
d.rejectMtx.RLock()
|
|
defer d.rejectMtx.RUnlock()
|
|
|
|
switch m := msg.(type) {
|
|
case *lnwire.ChannelUpdate:
|
|
_, ok := d.recentRejects[m.ShortChannelID.ToUint64()]
|
|
return ok
|
|
|
|
case *lnwire.ChannelAnnouncement:
|
|
_, ok := d.recentRejects[m.ShortChannelID.ToUint64()]
|
|
return ok
|
|
|
|
default:
|
|
return false
|
|
}
|
|
}
|
|
|
|
// retransmitStaleAnns examines all outgoing channels that the source node is
|
|
// known to maintain to check to see if any of them are "stale". A channel is
|
|
// stale iff, the last timestamp of its rebroadcast is older than the
|
|
// RebroadcastInterval. We also check if a refreshed node announcement should
|
|
// be resent.
|
|
func (d *AuthenticatedGossiper) retransmitStaleAnns(now time.Time) error {
|
|
// Iterate over all of our channels and check if any of them fall
|
|
// within the prune interval or re-broadcast interval.
|
|
type updateTuple struct {
|
|
info *channeldb.ChannelEdgeInfo
|
|
edge *channeldb.ChannelEdgePolicy
|
|
}
|
|
|
|
var (
|
|
havePublicChannels bool
|
|
edgesToUpdate []updateTuple
|
|
)
|
|
err := d.cfg.Router.ForAllOutgoingChannels(func(
|
|
info *channeldb.ChannelEdgeInfo,
|
|
edge *channeldb.ChannelEdgePolicy) error {
|
|
|
|
// If there's no auth proof attached to this edge, it means
|
|
// that it is a private channel not meant to be announced to
|
|
// the greater network, so avoid sending channel updates for
|
|
// this channel to not leak its
|
|
// existence.
|
|
if info.AuthProof == nil {
|
|
log.Debugf("Skipping retransmission of channel "+
|
|
"without AuthProof: %v", info.ChannelID)
|
|
return nil
|
|
}
|
|
|
|
// We make a note that we have at least one public channel. We
|
|
// use this to determine whether we should send a node
|
|
// announcement below.
|
|
havePublicChannels = true
|
|
|
|
// If this edge has a ChannelUpdate that was created before the
|
|
// introduction of the MaxHTLC field, then we'll update this
|
|
// edge to propagate this information in the network.
|
|
if !edge.MessageFlags.HasMaxHtlc() {
|
|
// We'll make sure we support the new max_htlc field if
|
|
// not already present.
|
|
edge.MessageFlags |= lnwire.ChanUpdateOptionMaxHtlc
|
|
edge.MaxHTLC = lnwire.NewMSatFromSatoshis(info.Capacity)
|
|
|
|
edgesToUpdate = append(edgesToUpdate, updateTuple{
|
|
info: info,
|
|
edge: edge,
|
|
})
|
|
return nil
|
|
}
|
|
|
|
timeElapsed := now.Sub(edge.LastUpdate)
|
|
|
|
// If it's been longer than RebroadcastInterval since we've
|
|
// re-broadcasted the channel, add the channel to the set of
|
|
// edges we need to update.
|
|
if timeElapsed >= d.cfg.RebroadcastInterval {
|
|
edgesToUpdate = append(edgesToUpdate, updateTuple{
|
|
info: info,
|
|
edge: edge,
|
|
})
|
|
}
|
|
|
|
return nil
|
|
})
|
|
if err != nil && err != channeldb.ErrGraphNoEdgesFound {
|
|
return fmt.Errorf("unable to retrieve outgoing channels: %v",
|
|
err)
|
|
}
|
|
|
|
var signedUpdates []lnwire.Message
|
|
for _, chanToUpdate := range edgesToUpdate {
|
|
// Re-sign and update the channel on disk and retrieve our
|
|
// ChannelUpdate to broadcast.
|
|
chanAnn, chanUpdate, err := d.updateChannel(
|
|
chanToUpdate.info, chanToUpdate.edge,
|
|
)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to update channel: %v", err)
|
|
}
|
|
|
|
// If we have a valid announcement to transmit, then we'll send
|
|
// that along with the update.
|
|
if chanAnn != nil {
|
|
signedUpdates = append(signedUpdates, chanAnn)
|
|
}
|
|
|
|
signedUpdates = append(signedUpdates, chanUpdate)
|
|
}
|
|
|
|
// If we don't have any public channels, we return as we don't want to
|
|
// broadcast anything that would reveal our existence.
|
|
if !havePublicChannels {
|
|
return nil
|
|
}
|
|
|
|
// We'll also check that our NodeAnnouncement is not too old.
|
|
currentNodeAnn, err := d.cfg.SelfNodeAnnouncement(false)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to get current node announment: %v",
|
|
err)
|
|
}
|
|
|
|
timestamp := time.Unix(int64(currentNodeAnn.Timestamp), 0)
|
|
timeElapsed := now.Sub(timestamp)
|
|
|
|
// If it's been a full day since we've re-broadcasted the
|
|
// node announcement, refresh it and resend it.
|
|
nodeAnnStr := ""
|
|
if timeElapsed >= d.cfg.RebroadcastInterval {
|
|
newNodeAnn, err := d.cfg.SelfNodeAnnouncement(true)
|
|
if err != nil {
|
|
return fmt.Errorf("unable to get refreshed node "+
|
|
"announcement: %v", err)
|
|
}
|
|
|
|
signedUpdates = append(signedUpdates, &newNodeAnn)
|
|
nodeAnnStr = " and our refreshed node announcement"
|
|
|
|
// Before broadcasting the refreshed node announcement, add it
|
|
// to our own graph.
|
|
if err := d.addNode(&newNodeAnn); err != nil {
|
|
log.Errorf("Unable to add refreshed node announcement "+
|
|
"to graph: %v", err)
|
|
}
|
|
}
|
|
|
|
// If we don't have any updates to re-broadcast, then we'll exit
|
|
// early.
|
|
if len(signedUpdates) == 0 {
|
|
return nil
|
|
}
|
|
|
|
log.Infof("Retransmitting %v outgoing channels%v",
|
|
len(edgesToUpdate), nodeAnnStr)
|
|
|
|
// With all the wire announcements properly crafted, we'll broadcast
|
|
// our known outgoing channels to all our immediate peers.
|
|
if err := d.cfg.Broadcast(nil, signedUpdates...); err != nil {
|
|
return fmt.Errorf("unable to re-broadcast channels: %v", err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// processChanPolicyUpdate generates a new set of channel updates for the
|
|
// provided list of edges and updates the backing ChannelGraphSource.
|
|
func (d *AuthenticatedGossiper) processChanPolicyUpdate(
|
|
edgesToUpdate []EdgeWithInfo) ([]networkMsg, error) {
|
|
|
|
var chanUpdates []networkMsg
|
|
for _, edgeInfo := range edgesToUpdate {
|
|
// Now that we've collected all the channels we need to update,
|
|
// we'll re-sign and update the backing ChannelGraphSource, and
|
|
// retrieve our ChannelUpdate to broadcast.
|
|
_, chanUpdate, err := d.updateChannel(
|
|
edgeInfo.Info, edgeInfo.Edge,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// We'll avoid broadcasting any updates for private channels to
|
|
// avoid directly giving away their existence. Instead, we'll
|
|
// send the update directly to the remote party.
|
|
if edgeInfo.Info.AuthProof == nil {
|
|
remotePubKey := remotePubFromChanInfo(
|
|
edgeInfo.Info, chanUpdate.ChannelFlags,
|
|
)
|
|
err := d.reliableSender.sendMessage(
|
|
chanUpdate, remotePubKey,
|
|
)
|
|
if err != nil {
|
|
log.Errorf("Unable to reliably send %v for "+
|
|
"channel=%v to peer=%x: %v",
|
|
chanUpdate.MsgType(),
|
|
chanUpdate.ShortChannelID,
|
|
remotePubKey, err)
|
|
}
|
|
continue
|
|
}
|
|
|
|
// We set ourselves as the source of this message to indicate
|
|
// that we shouldn't skip any peers when sending this message.
|
|
chanUpdates = append(chanUpdates, networkMsg{
|
|
source: d.selfKey,
|
|
msg: chanUpdate,
|
|
})
|
|
}
|
|
|
|
return chanUpdates, nil
|
|
}
|
|
|
|
// remotePubFromChanInfo returns the public key of the remote peer given a
|
|
// ChannelEdgeInfo that describe a channel we have with them.
|
|
func remotePubFromChanInfo(chanInfo *channeldb.ChannelEdgeInfo,
|
|
chanFlags lnwire.ChanUpdateChanFlags) [33]byte {
|
|
|
|
var remotePubKey [33]byte
|
|
switch {
|
|
case chanFlags&lnwire.ChanUpdateDirection == 0:
|
|
remotePubKey = chanInfo.NodeKey2Bytes
|
|
case chanFlags&lnwire.ChanUpdateDirection == 1:
|
|
remotePubKey = chanInfo.NodeKey1Bytes
|
|
}
|
|
|
|
return remotePubKey
|
|
}
|
|
|
|
// processRejectedEdge examines a rejected edge to see if we can extract any
|
|
// new announcements from it. An edge will get rejected if we already added
|
|
// the same edge without AuthProof to the graph. If the received announcement
|
|
// contains a proof, we can add this proof to our edge. We can end up in this
|
|
// situation in the case where we create a channel, but for some reason fail
|
|
// to receive the remote peer's proof, while the remote peer is able to fully
|
|
// assemble the proof and craft the ChannelAnnouncement.
|
|
func (d *AuthenticatedGossiper) processRejectedEdge(
|
|
chanAnnMsg *lnwire.ChannelAnnouncement,
|
|
proof *channeldb.ChannelAuthProof) ([]networkMsg, error) {
|
|
|
|
// First, we'll fetch the state of the channel as we know if from the
|
|
// database.
|
|
chanInfo, e1, e2, err := d.cfg.Router.GetChannelByID(
|
|
chanAnnMsg.ShortChannelID,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// The edge is in the graph, and has a proof attached, then we'll just
|
|
// reject it as normal.
|
|
if chanInfo.AuthProof != nil {
|
|
return nil, nil
|
|
}
|
|
|
|
// Otherwise, this means that the edge is within the graph, but it
|
|
// doesn't yet have a proper proof attached. If we did not receive
|
|
// the proof such that we now can add it, there's nothing more we
|
|
// can do.
|
|
if proof == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
// We'll then create then validate the new fully assembled
|
|
// announcement.
|
|
chanAnn, e1Ann, e2Ann, err := netann.CreateChanAnnouncement(
|
|
proof, chanInfo, e1, e2,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = routing.ValidateChannelAnn(chanAnn)
|
|
if err != nil {
|
|
err := fmt.Errorf("assembled channel announcement proof "+
|
|
"for shortChanID=%v isn't valid: %v",
|
|
chanAnnMsg.ShortChannelID, err)
|
|
log.Error(err)
|
|
return nil, err
|
|
}
|
|
|
|
// If everything checks out, then we'll add the fully assembled proof
|
|
// to the database.
|
|
err = d.cfg.Router.AddProof(chanAnnMsg.ShortChannelID, proof)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable add proof to shortChanID=%v: %v",
|
|
chanAnnMsg.ShortChannelID, err)
|
|
log.Error(err)
|
|
return nil, err
|
|
}
|
|
|
|
// As we now have a complete channel announcement for this channel,
|
|
// we'll construct the announcement so they can be broadcast out to all
|
|
// our peers.
|
|
announcements := make([]networkMsg, 0, 3)
|
|
announcements = append(announcements, networkMsg{
|
|
source: d.selfKey,
|
|
msg: chanAnn,
|
|
})
|
|
if e1Ann != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
source: d.selfKey,
|
|
msg: e1Ann,
|
|
})
|
|
}
|
|
if e2Ann != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
source: d.selfKey,
|
|
msg: e2Ann,
|
|
})
|
|
|
|
}
|
|
|
|
return announcements, nil
|
|
}
|
|
|
|
// addNode processes the given node announcement, and adds it to our channel
|
|
// graph.
|
|
func (d *AuthenticatedGossiper) addNode(msg *lnwire.NodeAnnouncement) error {
|
|
if err := routing.ValidateNodeAnn(msg); err != nil {
|
|
return fmt.Errorf("unable to validate node announcement: %v",
|
|
err)
|
|
}
|
|
|
|
timestamp := time.Unix(int64(msg.Timestamp), 0)
|
|
features := lnwire.NewFeatureVector(msg.Features, lnwire.Features)
|
|
node := &channeldb.LightningNode{
|
|
HaveNodeAnnouncement: true,
|
|
LastUpdate: timestamp,
|
|
Addresses: msg.Addresses,
|
|
PubKeyBytes: msg.NodeID,
|
|
Alias: msg.Alias.String(),
|
|
AuthSigBytes: msg.Signature.ToSignatureBytes(),
|
|
Features: features,
|
|
Color: msg.RGBColor,
|
|
ExtraOpaqueData: msg.ExtraOpaqueData,
|
|
}
|
|
|
|
return d.cfg.Router.AddNode(node)
|
|
}
|
|
|
|
// processNetworkAnnouncement processes a new network relate authenticated
|
|
// channel or node announcement or announcements proofs. If the announcement
|
|
// didn't affect the internal state due to either being out of date, invalid,
|
|
// or redundant, then nil is returned. Otherwise, the set of announcements will
|
|
// be returned which should be broadcasted to the rest of the network.
|
|
func (d *AuthenticatedGossiper) processNetworkAnnouncement(
|
|
nMsg *networkMsg) []networkMsg {
|
|
|
|
// isPremature *MUST* be called with the gossiper's lock held.
|
|
isPremature := func(chanID lnwire.ShortChannelID, delta uint32) bool {
|
|
// TODO(roasbeef) make height delta 6
|
|
// * or configurable
|
|
return chanID.BlockHeight+delta > d.bestHeight
|
|
}
|
|
|
|
var announcements []networkMsg
|
|
|
|
switch msg := nMsg.msg.(type) {
|
|
|
|
// A new node announcement has arrived which either presents new
|
|
// information about a node in one of the channels we know about, or a
|
|
// updating previously advertised information.
|
|
case *lnwire.NodeAnnouncement:
|
|
timestamp := time.Unix(int64(msg.Timestamp), 0)
|
|
|
|
// We'll quickly ask the router if it already has a
|
|
// newer update for this node so we can skip validating
|
|
// signatures if not required.
|
|
if d.cfg.Router.IsStaleNode(msg.NodeID, timestamp) {
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
if err := d.addNode(msg); err != nil {
|
|
if routing.IsError(err, routing.ErrOutdated,
|
|
routing.ErrIgnored) {
|
|
|
|
log.Debug(err)
|
|
} else {
|
|
log.Error(err)
|
|
}
|
|
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// In order to ensure we don't leak unadvertised nodes, we'll
|
|
// make a quick check to ensure this node intends to publicly
|
|
// advertise itself to the network.
|
|
isPublic, err := d.cfg.Router.IsPublicNode(msg.NodeID)
|
|
if err != nil {
|
|
log.Errorf("Unable to determine if node %x is "+
|
|
"advertised: %v", msg.NodeID, err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If it does, we'll add their announcement to our batch so that
|
|
// it can be broadcast to the rest of our peers.
|
|
if isPublic {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: msg,
|
|
})
|
|
} else {
|
|
log.Tracef("Skipping broadcasting node announcement "+
|
|
"for %x due to being unadvertised", msg.NodeID)
|
|
}
|
|
|
|
nMsg.err <- nil
|
|
// TODO(roasbeef): get rid of the above
|
|
return announcements
|
|
|
|
// A new channel announcement has arrived, this indicates the
|
|
// *creation* of a new channel within the network. This only advertises
|
|
// the existence of a channel and not yet the routing policies in
|
|
// either direction of the channel.
|
|
case *lnwire.ChannelAnnouncement:
|
|
// We'll ignore any channel announcements that target any chain
|
|
// other than the set of chains we know of.
|
|
if !bytes.Equal(msg.ChainHash[:], d.cfg.ChainHash[:]) {
|
|
err := fmt.Errorf("ignoring ChannelAnnouncement from "+
|
|
"chain=%v, gossiper on chain=%v", msg.ChainHash,
|
|
d.cfg.ChainHash)
|
|
log.Errorf(err.Error())
|
|
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If the advertised inclusionary block is beyond our knowledge
|
|
// of the chain tip, then we'll put the announcement in limbo
|
|
// to be fully verified once we advance forward in the chain.
|
|
d.Lock()
|
|
if nMsg.isRemote && isPremature(msg.ShortChannelID, 0) {
|
|
blockHeight := msg.ShortChannelID.BlockHeight
|
|
log.Infof("Announcement for chan_id=(%v), is "+
|
|
"premature: advertises height %v, only "+
|
|
"height %v is known",
|
|
msg.ShortChannelID.ToUint64(),
|
|
msg.ShortChannelID.BlockHeight,
|
|
d.bestHeight)
|
|
|
|
d.prematureAnnouncements[blockHeight] = append(
|
|
d.prematureAnnouncements[blockHeight],
|
|
nMsg,
|
|
)
|
|
d.Unlock()
|
|
return nil
|
|
}
|
|
d.Unlock()
|
|
|
|
// At this point, we'll now ask the router if this is a
|
|
// zombie/known edge. If so we can skip all the processing
|
|
// below.
|
|
if d.cfg.Router.IsKnownEdge(msg.ShortChannelID) {
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
// If this is a remote channel announcement, then we'll validate
|
|
// all the signatures within the proof as it should be well
|
|
// formed.
|
|
var proof *channeldb.ChannelAuthProof
|
|
if nMsg.isRemote {
|
|
if err := routing.ValidateChannelAnn(msg); err != nil {
|
|
err := fmt.Errorf("unable to validate "+
|
|
"announcement: %v", err)
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If the proof checks out, then we'll save the proof
|
|
// itself to the database so we can fetch it later when
|
|
// gossiping with other nodes.
|
|
proof = &channeldb.ChannelAuthProof{
|
|
NodeSig1Bytes: msg.NodeSig1.ToSignatureBytes(),
|
|
NodeSig2Bytes: msg.NodeSig2.ToSignatureBytes(),
|
|
BitcoinSig1Bytes: msg.BitcoinSig1.ToSignatureBytes(),
|
|
BitcoinSig2Bytes: msg.BitcoinSig2.ToSignatureBytes(),
|
|
}
|
|
}
|
|
|
|
// With the proof validate (if necessary), we can now store it
|
|
// within the database for our path finding and syncing needs.
|
|
var featureBuf bytes.Buffer
|
|
if err := msg.Features.Encode(&featureBuf); err != nil {
|
|
log.Errorf("unable to encode features: %v", err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
edge := &channeldb.ChannelEdgeInfo{
|
|
ChannelID: msg.ShortChannelID.ToUint64(),
|
|
ChainHash: msg.ChainHash,
|
|
NodeKey1Bytes: msg.NodeID1,
|
|
NodeKey2Bytes: msg.NodeID2,
|
|
BitcoinKey1Bytes: msg.BitcoinKey1,
|
|
BitcoinKey2Bytes: msg.BitcoinKey2,
|
|
AuthProof: proof,
|
|
Features: featureBuf.Bytes(),
|
|
ExtraOpaqueData: msg.ExtraOpaqueData,
|
|
}
|
|
|
|
// If there were any optional message fields provided, we'll
|
|
// include them in its serialized disk representation now.
|
|
if nMsg.optionalMsgFields != nil {
|
|
if nMsg.optionalMsgFields.capacity != nil {
|
|
edge.Capacity = *nMsg.optionalMsgFields.capacity
|
|
}
|
|
if nMsg.optionalMsgFields.channelPoint != nil {
|
|
edge.ChannelPoint = *nMsg.optionalMsgFields.channelPoint
|
|
}
|
|
}
|
|
|
|
// We will add the edge to the channel router. If the nodes
|
|
// present in this channel are not present in the database, a
|
|
// partial node will be added to represent each node while we
|
|
// wait for a node announcement.
|
|
//
|
|
// Before we add the edge to the database, we obtain
|
|
// the mutex for this channel ID. We do this to ensure
|
|
// no other goroutine has read the database and is now
|
|
// making decisions based on this DB state, before it
|
|
// writes to the DB.
|
|
d.channelMtx.Lock(msg.ShortChannelID.ToUint64())
|
|
defer d.channelMtx.Unlock(msg.ShortChannelID.ToUint64())
|
|
if err := d.cfg.Router.AddEdge(edge); err != nil {
|
|
// If the edge was rejected due to already being known,
|
|
// then it may be that case that this new message has a
|
|
// fresh channel proof, so we'll check.
|
|
if routing.IsError(err, routing.ErrIgnored) {
|
|
// Attempt to process the rejected message to
|
|
// see if we get any new announcements.
|
|
anns, rErr := d.processRejectedEdge(msg, proof)
|
|
if rErr != nil {
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
nMsg.err <- rErr
|
|
return nil
|
|
}
|
|
|
|
// If while processing this rejected edge, we
|
|
// realized there's a set of announcements we
|
|
// could extract, then we'll return those
|
|
// directly.
|
|
if len(anns) != 0 {
|
|
nMsg.err <- nil
|
|
return anns
|
|
}
|
|
|
|
// Otherwise, this is just a regular rejected
|
|
// edge.
|
|
log.Debugf("Router rejected channel "+
|
|
"edge: %v", err)
|
|
} else {
|
|
log.Tracef("Router rejected channel "+
|
|
"edge: %v", err)
|
|
}
|
|
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If we earlier received any ChannelUpdates for this channel,
|
|
// we can now process them, as the channel is added to the
|
|
// graph.
|
|
shortChanID := msg.ShortChannelID.ToUint64()
|
|
var channelUpdates []*networkMsg
|
|
|
|
d.pChanUpdMtx.Lock()
|
|
channelUpdates = append(channelUpdates, d.prematureChannelUpdates[shortChanID]...)
|
|
|
|
// Now delete the premature ChannelUpdates, since we added them
|
|
// all to the queue of network messages.
|
|
delete(d.prematureChannelUpdates, shortChanID)
|
|
d.pChanUpdMtx.Unlock()
|
|
|
|
// Launch a new goroutine to handle each ChannelUpdate, this to
|
|
// ensure we don't block here, as we can handle only one
|
|
// announcement at a time.
|
|
for _, cu := range channelUpdates {
|
|
d.wg.Add(1)
|
|
go func(nMsg *networkMsg) {
|
|
defer d.wg.Done()
|
|
|
|
switch msg := nMsg.msg.(type) {
|
|
|
|
// Reprocess the message, making sure we return
|
|
// an error to the original caller in case the
|
|
// gossiper shuts down.
|
|
case *lnwire.ChannelUpdate:
|
|
log.Debugf("Reprocessing"+
|
|
" ChannelUpdate for "+
|
|
"shortChanID=%v",
|
|
msg.ShortChannelID.ToUint64())
|
|
|
|
select {
|
|
case d.networkMsgs <- nMsg:
|
|
case <-d.quit:
|
|
nMsg.err <- ErrGossiperShuttingDown
|
|
}
|
|
|
|
// We don't expect any other message type than
|
|
// ChannelUpdate to be in this map.
|
|
default:
|
|
log.Errorf("Unsupported message type "+
|
|
"found among ChannelUpdates: "+
|
|
"%T", msg)
|
|
}
|
|
}(cu)
|
|
}
|
|
|
|
// Channel announcement was successfully proceeded and know it
|
|
// might be broadcast to other connected nodes if it was
|
|
// announcement with proof (remote).
|
|
if proof != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: msg,
|
|
})
|
|
}
|
|
|
|
nMsg.err <- nil
|
|
return announcements
|
|
|
|
// A new authenticated channel edge update has arrived. This indicates
|
|
// that the directional information for an already known channel has
|
|
// been updated.
|
|
case *lnwire.ChannelUpdate:
|
|
// We'll ignore any channel announcements that target any chain
|
|
// other than the set of chains we know of.
|
|
if !bytes.Equal(msg.ChainHash[:], d.cfg.ChainHash[:]) {
|
|
err := fmt.Errorf("ignoring ChannelUpdate from "+
|
|
"chain=%v, gossiper on chain=%v", msg.ChainHash,
|
|
d.cfg.ChainHash)
|
|
log.Errorf(err.Error())
|
|
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
blockHeight := msg.ShortChannelID.BlockHeight
|
|
shortChanID := msg.ShortChannelID.ToUint64()
|
|
|
|
// If the advertised inclusionary block is beyond our knowledge
|
|
// of the chain tip, then we'll put the announcement in limbo
|
|
// to be fully verified once we advance forward in the chain.
|
|
d.Lock()
|
|
if nMsg.isRemote && isPremature(msg.ShortChannelID, 0) {
|
|
log.Infof("Update announcement for "+
|
|
"short_chan_id(%v), is premature: advertises "+
|
|
"height %v, only height %v is known",
|
|
shortChanID, blockHeight,
|
|
d.bestHeight)
|
|
|
|
d.prematureAnnouncements[blockHeight] = append(
|
|
d.prematureAnnouncements[blockHeight],
|
|
nMsg,
|
|
)
|
|
d.Unlock()
|
|
return nil
|
|
}
|
|
d.Unlock()
|
|
|
|
// Before we perform any of the expensive checks below, we'll
|
|
// check whether this update is stale or is for a zombie
|
|
// channel in order to quickly reject it.
|
|
timestamp := time.Unix(int64(msg.Timestamp), 0)
|
|
if d.cfg.Router.IsStaleEdgePolicy(
|
|
msg.ShortChannelID, timestamp, msg.ChannelFlags,
|
|
) {
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
// Get the node pub key as far as we don't have it in channel
|
|
// update announcement message. We'll need this to properly
|
|
// verify message signature.
|
|
//
|
|
// We make sure to obtain the mutex for this channel ID
|
|
// before we access the database. This ensures the state
|
|
// we read from the database has not changed between this
|
|
// point and when we call UpdateEdge() later.
|
|
d.channelMtx.Lock(msg.ShortChannelID.ToUint64())
|
|
defer d.channelMtx.Unlock(msg.ShortChannelID.ToUint64())
|
|
chanInfo, edge1, edge2, err := d.cfg.Router.GetChannelByID(msg.ShortChannelID)
|
|
switch err {
|
|
// No error, break.
|
|
case nil:
|
|
break
|
|
|
|
case channeldb.ErrZombieEdge:
|
|
// Since we've deemed the update as not stale above,
|
|
// before marking it live, we'll make sure it has been
|
|
// signed by the correct party. The least-significant
|
|
// bit in the flag on the channel update tells us which
|
|
// edge is being updated.
|
|
var pubKey *btcec.PublicKey
|
|
switch {
|
|
case msg.ChannelFlags&lnwire.ChanUpdateDirection == 0:
|
|
pubKey, _ = chanInfo.NodeKey1()
|
|
case msg.ChannelFlags&lnwire.ChanUpdateDirection == 1:
|
|
pubKey, _ = chanInfo.NodeKey2()
|
|
}
|
|
|
|
err := routing.VerifyChannelUpdateSignature(msg, pubKey)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to verify channel "+
|
|
"update signature: %v", err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// With the signature valid, we'll proceed to mark the
|
|
// edge as live and wait for the channel announcement to
|
|
// come through again.
|
|
err = d.cfg.Router.MarkEdgeLive(msg.ShortChannelID)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to remove edge with "+
|
|
"chan_id=%v from zombie index: %v",
|
|
msg.ShortChannelID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
log.Debugf("Removed edge with chan_id=%v from zombie "+
|
|
"index", msg.ShortChannelID)
|
|
|
|
// We'll fallthrough to ensure we stash the update until
|
|
// we receive its corresponding ChannelAnnouncement.
|
|
// This is needed to ensure the edge exists in the graph
|
|
// before applying the update.
|
|
fallthrough
|
|
case channeldb.ErrGraphNotFound:
|
|
fallthrough
|
|
case channeldb.ErrGraphNoEdgesFound:
|
|
fallthrough
|
|
case channeldb.ErrEdgeNotFound:
|
|
// If the edge corresponding to this ChannelUpdate was
|
|
// not found in the graph, this might be a channel in
|
|
// the process of being opened, and we haven't processed
|
|
// our own ChannelAnnouncement yet, hence it is not
|
|
// found in the graph. This usually gets resolved after
|
|
// the channel proofs are exchanged and the channel is
|
|
// broadcasted to the rest of the network, but in case
|
|
// this is a private channel this won't ever happen.
|
|
// This can also happen in the case of a zombie channel
|
|
// with a fresh update for which we don't have a
|
|
// ChannelAnnouncement for since we reject them. Because
|
|
// of this, we temporarily add it to a map, and
|
|
// reprocess it after our own ChannelAnnouncement has
|
|
// been processed.
|
|
d.pChanUpdMtx.Lock()
|
|
d.prematureChannelUpdates[shortChanID] = append(
|
|
d.prematureChannelUpdates[shortChanID], nMsg,
|
|
)
|
|
d.pChanUpdMtx.Unlock()
|
|
|
|
log.Debugf("Got ChannelUpdate for edge not found in "+
|
|
"graph(shortChanID=%v), saving for "+
|
|
"reprocessing later", shortChanID)
|
|
|
|
// NOTE: We don't return anything on the error channel
|
|
// for this message, as we expect that will be done when
|
|
// this ChannelUpdate is later reprocessed.
|
|
return nil
|
|
|
|
default:
|
|
err := fmt.Errorf("unable to validate channel update "+
|
|
"short_chan_id=%v: %v", shortChanID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
return nil
|
|
}
|
|
|
|
// The least-significant bit in the flag on the channel update
|
|
// announcement tells us "which" side of the channels directed
|
|
// edge is being updated.
|
|
var (
|
|
pubKey *btcec.PublicKey
|
|
edgeToUpdate *channeldb.ChannelEdgePolicy
|
|
)
|
|
direction := msg.ChannelFlags & lnwire.ChanUpdateDirection
|
|
switch direction {
|
|
case 0:
|
|
pubKey, _ = chanInfo.NodeKey1()
|
|
edgeToUpdate = edge1
|
|
case 1:
|
|
pubKey, _ = chanInfo.NodeKey2()
|
|
edgeToUpdate = edge2
|
|
}
|
|
|
|
// If we have a previous version of the edge being updated,
|
|
// we'll want to rate limit its updates to prevent spam
|
|
// throughout the network.
|
|
if nMsg.isRemote && edgeToUpdate != nil {
|
|
// If it's a keep-alive update, we'll only propagate one
|
|
// if it's been a day since the previous. This follows
|
|
// our own heuristic of sending keep-alive updates after
|
|
// the same duration (see retransmitStaleAnns).
|
|
timeSinceLastUpdate := timestamp.Sub(edgeToUpdate.LastUpdate)
|
|
if IsKeepAliveUpdate(msg, edgeToUpdate) {
|
|
if timeSinceLastUpdate < d.cfg.RebroadcastInterval {
|
|
log.Debugf("Ignoring keep alive update "+
|
|
"not within %v period for "+
|
|
"channel %v",
|
|
d.cfg.RebroadcastInterval,
|
|
shortChanID)
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
} else {
|
|
// If it's not, we'll only allow a single update
|
|
// for this channel per block.
|
|
d.Lock()
|
|
lastUpdateHeight := d.heightForLastChanUpdate[shortChanID]
|
|
if lastUpdateHeight[direction] == d.bestHeight {
|
|
log.Debugf("Ignoring update for "+
|
|
"channel %v due to previous "+
|
|
"update occurring within the "+
|
|
"same block %v", shortChanID,
|
|
d.bestHeight)
|
|
d.Unlock()
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
d.Unlock()
|
|
}
|
|
}
|
|
|
|
// Validate the channel announcement with the expected public key and
|
|
// channel capacity. In the case of an invalid channel update, we'll
|
|
// return an error to the caller and exit early.
|
|
err = routing.ValidateChannelUpdateAnn(pubKey, chanInfo.Capacity, msg)
|
|
if err != nil {
|
|
rErr := fmt.Errorf("unable to validate channel "+
|
|
"update announcement for short_chan_id=%v: %v",
|
|
spew.Sdump(msg.ShortChannelID), err)
|
|
|
|
log.Error(rErr)
|
|
nMsg.err <- rErr
|
|
return nil
|
|
}
|
|
|
|
update := &channeldb.ChannelEdgePolicy{
|
|
SigBytes: msg.Signature.ToSignatureBytes(),
|
|
ChannelID: shortChanID,
|
|
LastUpdate: timestamp,
|
|
MessageFlags: msg.MessageFlags,
|
|
ChannelFlags: msg.ChannelFlags,
|
|
TimeLockDelta: msg.TimeLockDelta,
|
|
MinHTLC: msg.HtlcMinimumMsat,
|
|
MaxHTLC: msg.HtlcMaximumMsat,
|
|
FeeBaseMSat: lnwire.MilliSatoshi(msg.BaseFee),
|
|
FeeProportionalMillionths: lnwire.MilliSatoshi(msg.FeeRate),
|
|
ExtraOpaqueData: msg.ExtraOpaqueData,
|
|
}
|
|
|
|
if err := d.cfg.Router.UpdateEdge(update); err != nil {
|
|
if routing.IsError(err, routing.ErrOutdated,
|
|
routing.ErrIgnored) {
|
|
log.Debug(err)
|
|
} else {
|
|
d.rejectMtx.Lock()
|
|
d.recentRejects[msg.ShortChannelID.ToUint64()] = struct{}{}
|
|
d.rejectMtx.Unlock()
|
|
log.Error(err)
|
|
}
|
|
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// With the edge successfully updated on disk, we'll note the
|
|
// current height so that we're able to rate limit any future
|
|
// updates for the same channel.
|
|
d.Lock()
|
|
lastUpdateHeight := d.heightForLastChanUpdate[shortChanID]
|
|
lastUpdateHeight[direction] = d.bestHeight
|
|
d.heightForLastChanUpdate[shortChanID] = lastUpdateHeight
|
|
d.Unlock()
|
|
|
|
// If this is a local ChannelUpdate without an AuthProof, it
|
|
// means it is an update to a channel that is not (yet)
|
|
// supposed to be announced to the greater network. However,
|
|
// our channel counter party will need to be given the update,
|
|
// so we'll try sending the update directly to the remote peer.
|
|
if !nMsg.isRemote && chanInfo.AuthProof == nil {
|
|
// Get our peer's public key.
|
|
remotePubKey := remotePubFromChanInfo(
|
|
chanInfo, msg.ChannelFlags,
|
|
)
|
|
|
|
// Now, we'll attempt to send the channel update message
|
|
// reliably to the remote peer in the background, so
|
|
// that we don't block if the peer happens to be offline
|
|
// at the moment.
|
|
err := d.reliableSender.sendMessage(msg, remotePubKey)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to reliably send %v "+
|
|
"for channel=%v to peer=%x: %v",
|
|
msg.MsgType(), msg.ShortChannelID,
|
|
remotePubKey, err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Channel update announcement was successfully processed and
|
|
// now it can be broadcast to the rest of the network. However,
|
|
// we'll only broadcast the channel update announcement if it
|
|
// has an attached authentication proof.
|
|
if chanInfo.AuthProof != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: msg,
|
|
})
|
|
}
|
|
|
|
nMsg.err <- nil
|
|
return announcements
|
|
|
|
// A new signature announcement has been received. This indicates
|
|
// willingness of nodes involved in the funding of a channel to
|
|
// announce this new channel to the rest of the world.
|
|
case *lnwire.AnnounceSignatures:
|
|
needBlockHeight := msg.ShortChannelID.BlockHeight +
|
|
d.cfg.ProofMatureDelta
|
|
shortChanID := msg.ShortChannelID.ToUint64()
|
|
|
|
prefix := "local"
|
|
if nMsg.isRemote {
|
|
prefix = "remote"
|
|
}
|
|
|
|
log.Infof("Received new %v channel announcement for %v", prefix,
|
|
msg.ShortChannelID)
|
|
|
|
// By the specification, channel announcement proofs should be
|
|
// sent after some number of confirmations after channel was
|
|
// registered in bitcoin blockchain. Therefore, we check if the
|
|
// proof is premature. If so we'll halt processing until the
|
|
// expected announcement height. This allows us to be tolerant
|
|
// to other clients if this constraint was changed.
|
|
d.Lock()
|
|
if isPremature(msg.ShortChannelID, d.cfg.ProofMatureDelta) {
|
|
d.prematureAnnouncements[needBlockHeight] = append(
|
|
d.prematureAnnouncements[needBlockHeight],
|
|
nMsg,
|
|
)
|
|
log.Infof("Premature proof announcement, "+
|
|
"current block height lower than needed: %v <"+
|
|
" %v, add announcement to reprocessing batch",
|
|
d.bestHeight, needBlockHeight)
|
|
d.Unlock()
|
|
return nil
|
|
}
|
|
d.Unlock()
|
|
|
|
// Ensure that we know of a channel with the target channel ID
|
|
// before proceeding further.
|
|
//
|
|
// We must acquire the mutex for this channel ID before getting
|
|
// the channel from the database, to ensure what we read does
|
|
// not change before we call AddProof() later.
|
|
d.channelMtx.Lock(msg.ShortChannelID.ToUint64())
|
|
defer d.channelMtx.Unlock(msg.ShortChannelID.ToUint64())
|
|
|
|
chanInfo, e1, e2, err := d.cfg.Router.GetChannelByID(
|
|
msg.ShortChannelID)
|
|
if err != nil {
|
|
// TODO(andrew.shvv) this is dangerous because remote
|
|
// node might rewrite the waiting proof.
|
|
proof := channeldb.NewWaitingProof(nMsg.isRemote, msg)
|
|
err := d.cfg.WaitingProofStore.Add(proof)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to store "+
|
|
"the proof for short_chan_id=%v: %v",
|
|
shortChanID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
log.Infof("Orphan %v proof announcement with "+
|
|
"short_chan_id=%v, adding "+
|
|
"to waiting batch", prefix, shortChanID)
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
nodeID := nMsg.source.SerializeCompressed()
|
|
isFirstNode := bytes.Equal(nodeID, chanInfo.NodeKey1Bytes[:])
|
|
isSecondNode := bytes.Equal(nodeID, chanInfo.NodeKey2Bytes[:])
|
|
|
|
// Ensure that channel that was retrieved belongs to the peer
|
|
// which sent the proof announcement.
|
|
if !(isFirstNode || isSecondNode) {
|
|
err := fmt.Errorf("channel that was received not "+
|
|
"belongs to the peer which sent the proof, "+
|
|
"short_chan_id=%v", shortChanID)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If proof was sent by a local sub-system, then we'll
|
|
// send the announcement signature to the remote node
|
|
// so they can also reconstruct the full channel
|
|
// announcement.
|
|
if !nMsg.isRemote {
|
|
var remotePubKey [33]byte
|
|
if isFirstNode {
|
|
remotePubKey = chanInfo.NodeKey2Bytes
|
|
} else {
|
|
remotePubKey = chanInfo.NodeKey1Bytes
|
|
}
|
|
// Since the remote peer might not be online
|
|
// we'll call a method that will attempt to
|
|
// deliver the proof when it comes online.
|
|
err := d.reliableSender.sendMessage(msg, remotePubKey)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to reliably send %v "+
|
|
"for channel=%v to peer=%x: %v",
|
|
msg.MsgType(), msg.ShortChannelID,
|
|
remotePubKey, err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// Check if we already have the full proof for this channel.
|
|
if chanInfo.AuthProof != nil {
|
|
// If we already have the fully assembled proof, then
|
|
// the peer sending us their proof has probably not
|
|
// received our local proof yet. So be kind and send
|
|
// them the full proof.
|
|
if nMsg.isRemote {
|
|
peerID := nMsg.source.SerializeCompressed()
|
|
log.Debugf("Got AnnounceSignatures for " +
|
|
"channel with full proof.")
|
|
|
|
d.wg.Add(1)
|
|
go func() {
|
|
defer d.wg.Done()
|
|
log.Debugf("Received half proof for "+
|
|
"channel %v with existing "+
|
|
"full proof. Sending full "+
|
|
"proof to peer=%x",
|
|
msg.ChannelID,
|
|
peerID)
|
|
|
|
chanAnn, _, _, err := netann.CreateChanAnnouncement(
|
|
chanInfo.AuthProof, chanInfo,
|
|
e1, e2,
|
|
)
|
|
if err != nil {
|
|
log.Errorf("unable to gen "+
|
|
"ann: %v", err)
|
|
return
|
|
}
|
|
err = nMsg.peer.SendMessage(
|
|
false, chanAnn,
|
|
)
|
|
if err != nil {
|
|
log.Errorf("Failed sending "+
|
|
"full proof to "+
|
|
"peer=%x: %v",
|
|
peerID, err)
|
|
return
|
|
}
|
|
log.Debugf("Full proof sent to peer=%x"+
|
|
" for chanID=%v", peerID,
|
|
msg.ChannelID)
|
|
}()
|
|
}
|
|
|
|
log.Debugf("Already have proof for channel "+
|
|
"with chanID=%v", msg.ChannelID)
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
// Check that we received the opposite proof. If so, then we're
|
|
// now able to construct the full proof, and create the channel
|
|
// announcement. If we didn't receive the opposite half of the
|
|
// proof than we should store it this one, and wait for
|
|
// opposite to be received.
|
|
proof := channeldb.NewWaitingProof(nMsg.isRemote, msg)
|
|
oppositeProof, err := d.cfg.WaitingProofStore.Get(
|
|
proof.OppositeKey(),
|
|
)
|
|
if err != nil && err != channeldb.ErrWaitingProofNotFound {
|
|
err := fmt.Errorf("unable to get "+
|
|
"the opposite proof for short_chan_id=%v: %v",
|
|
shortChanID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
if err == channeldb.ErrWaitingProofNotFound {
|
|
err := d.cfg.WaitingProofStore.Add(proof)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable to store "+
|
|
"the proof for short_chan_id=%v: %v",
|
|
shortChanID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
log.Infof("1/2 of channel ann proof received for "+
|
|
"short_chan_id=%v, waiting for other half",
|
|
shortChanID)
|
|
|
|
nMsg.err <- nil
|
|
return nil
|
|
}
|
|
|
|
// We now have both halves of the channel announcement proof,
|
|
// then we'll reconstruct the initial announcement so we can
|
|
// validate it shortly below.
|
|
var dbProof channeldb.ChannelAuthProof
|
|
if isFirstNode {
|
|
dbProof.NodeSig1Bytes = msg.NodeSignature.ToSignatureBytes()
|
|
dbProof.NodeSig2Bytes = oppositeProof.NodeSignature.ToSignatureBytes()
|
|
dbProof.BitcoinSig1Bytes = msg.BitcoinSignature.ToSignatureBytes()
|
|
dbProof.BitcoinSig2Bytes = oppositeProof.BitcoinSignature.ToSignatureBytes()
|
|
} else {
|
|
dbProof.NodeSig1Bytes = oppositeProof.NodeSignature.ToSignatureBytes()
|
|
dbProof.NodeSig2Bytes = msg.NodeSignature.ToSignatureBytes()
|
|
dbProof.BitcoinSig1Bytes = oppositeProof.BitcoinSignature.ToSignatureBytes()
|
|
dbProof.BitcoinSig2Bytes = msg.BitcoinSignature.ToSignatureBytes()
|
|
}
|
|
chanAnn, e1Ann, e2Ann, err := netann.CreateChanAnnouncement(
|
|
&dbProof, chanInfo, e1, e2,
|
|
)
|
|
if err != nil {
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// With all the necessary components assembled validate the
|
|
// full channel announcement proof.
|
|
if err := routing.ValidateChannelAnn(chanAnn); err != nil {
|
|
err := fmt.Errorf("channel announcement proof "+
|
|
"for short_chan_id=%v isn't valid: %v",
|
|
shortChanID, err)
|
|
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// If the channel was returned by the router it means that
|
|
// existence of funding point and inclusion of nodes bitcoin
|
|
// keys in it already checked by the router. In this stage we
|
|
// should check that node keys are attest to the bitcoin keys
|
|
// by validating the signatures of announcement. If proof is
|
|
// valid then we'll populate the channel edge with it, so we
|
|
// can announce it on peer connect.
|
|
err = d.cfg.Router.AddProof(msg.ShortChannelID, &dbProof)
|
|
if err != nil {
|
|
err := fmt.Errorf("unable add proof to the "+
|
|
"channel chanID=%v: %v", msg.ChannelID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
err = d.cfg.WaitingProofStore.Remove(proof.OppositeKey())
|
|
if err != nil {
|
|
err := fmt.Errorf("unable remove opposite proof "+
|
|
"for the channel with chanID=%v: %v",
|
|
msg.ChannelID, err)
|
|
log.Error(err)
|
|
nMsg.err <- err
|
|
return nil
|
|
}
|
|
|
|
// Proof was successfully created and now can announce the
|
|
// channel to the remain network.
|
|
log.Infof("Fully valid channel proof for short_chan_id=%v "+
|
|
"constructed, adding to next ann batch",
|
|
shortChanID)
|
|
|
|
// Assemble the necessary announcements to add to the next
|
|
// broadcasting batch.
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: chanAnn,
|
|
})
|
|
if e1Ann != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: e1Ann,
|
|
})
|
|
}
|
|
if e2Ann != nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nMsg.source,
|
|
msg: e2Ann,
|
|
})
|
|
}
|
|
|
|
// We'll also send along the node announcements for each channel
|
|
// participant if we know of them. To ensure our node
|
|
// announcement propagates to our channel counterparty, we'll
|
|
// set the source for each announcement to the node it belongs
|
|
// to, otherwise we won't send it since the source gets skipped.
|
|
// This isn't necessary for channel updates and announcement
|
|
// signatures since we send those directly to our channel
|
|
// counterparty through the gossiper's reliable sender.
|
|
node1Ann, err := d.fetchNodeAnn(chanInfo.NodeKey1Bytes)
|
|
if err != nil {
|
|
log.Debugf("Unable to fetch node announcement for "+
|
|
"%x: %v", chanInfo.NodeKey1Bytes, err)
|
|
} else {
|
|
if nodeKey1, err := chanInfo.NodeKey1(); err == nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nodeKey1,
|
|
msg: node1Ann,
|
|
})
|
|
}
|
|
}
|
|
node2Ann, err := d.fetchNodeAnn(chanInfo.NodeKey2Bytes)
|
|
if err != nil {
|
|
log.Debugf("Unable to fetch node announcement for "+
|
|
"%x: %v", chanInfo.NodeKey2Bytes, err)
|
|
} else {
|
|
if nodeKey2, err := chanInfo.NodeKey2(); err == nil {
|
|
announcements = append(announcements, networkMsg{
|
|
peer: nMsg.peer,
|
|
source: nodeKey2,
|
|
msg: node2Ann,
|
|
})
|
|
}
|
|
}
|
|
|
|
nMsg.err <- nil
|
|
return announcements
|
|
|
|
default:
|
|
nMsg.err <- errors.New("wrong type of the announcement")
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// fetchNodeAnn fetches the latest signed node announcement from our point of
|
|
// view for the node with the given public key.
|
|
func (d *AuthenticatedGossiper) fetchNodeAnn(
|
|
pubKey [33]byte) (*lnwire.NodeAnnouncement, error) {
|
|
|
|
node, err := d.cfg.Router.FetchLightningNode(pubKey)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return node.NodeAnnouncement(true)
|
|
}
|
|
|
|
// isMsgStale determines whether a message retrieved from the backing
|
|
// MessageStore is seen as stale by the current graph.
|
|
func (d *AuthenticatedGossiper) isMsgStale(msg lnwire.Message) bool {
|
|
switch msg := msg.(type) {
|
|
case *lnwire.AnnounceSignatures:
|
|
chanInfo, _, _, err := d.cfg.Router.GetChannelByID(
|
|
msg.ShortChannelID,
|
|
)
|
|
|
|
// If the channel cannot be found, it is most likely a leftover
|
|
// message for a channel that was closed, so we can consider it
|
|
// stale.
|
|
if err == channeldb.ErrEdgeNotFound {
|
|
return true
|
|
}
|
|
if err != nil {
|
|
log.Debugf("Unable to retrieve channel=%v from graph: "+
|
|
"%v", err)
|
|
return false
|
|
}
|
|
|
|
// If the proof exists in the graph, then we have successfully
|
|
// received the remote proof and assembled the full proof, so we
|
|
// can safely delete the local proof from the database.
|
|
return chanInfo.AuthProof != nil
|
|
|
|
case *lnwire.ChannelUpdate:
|
|
_, p1, p2, err := d.cfg.Router.GetChannelByID(msg.ShortChannelID)
|
|
|
|
// If the channel cannot be found, it is most likely a leftover
|
|
// message for a channel that was closed, so we can consider it
|
|
// stale.
|
|
if err == channeldb.ErrEdgeNotFound {
|
|
return true
|
|
}
|
|
if err != nil {
|
|
log.Debugf("Unable to retrieve channel=%v from graph: "+
|
|
"%v", msg.ShortChannelID, err)
|
|
return false
|
|
}
|
|
|
|
// Otherwise, we'll retrieve the correct policy that we
|
|
// currently have stored within our graph to check if this
|
|
// message is stale by comparing its timestamp.
|
|
var p *channeldb.ChannelEdgePolicy
|
|
if msg.ChannelFlags&lnwire.ChanUpdateDirection == 0 {
|
|
p = p1
|
|
} else {
|
|
p = p2
|
|
}
|
|
|
|
// If the policy is still unknown, then we can consider this
|
|
// policy fresh.
|
|
if p == nil {
|
|
return false
|
|
}
|
|
|
|
timestamp := time.Unix(int64(msg.Timestamp), 0)
|
|
return p.LastUpdate.After(timestamp)
|
|
|
|
default:
|
|
// We'll make sure to not mark any unsupported messages as stale
|
|
// to ensure they are not removed.
|
|
return false
|
|
}
|
|
}
|
|
|
|
// updateChannel creates a new fully signed update for the channel, and updates
|
|
// the underlying graph with the new state.
|
|
func (d *AuthenticatedGossiper) updateChannel(info *channeldb.ChannelEdgeInfo,
|
|
edge *channeldb.ChannelEdgePolicy) (*lnwire.ChannelAnnouncement,
|
|
*lnwire.ChannelUpdate, error) {
|
|
|
|
// Parse the unsigned edge into a channel update.
|
|
chanUpdate := netann.UnsignedChannelUpdateFromEdge(info, edge)
|
|
|
|
// We'll generate a new signature over a digest of the channel
|
|
// announcement itself and update the timestamp to ensure it propagate.
|
|
err := netann.SignChannelUpdate(
|
|
d.cfg.AnnSigner, d.selfKey, chanUpdate,
|
|
netann.ChanUpdSetTimestamp,
|
|
)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// Next, we'll set the new signature in place, and update the reference
|
|
// in the backing slice.
|
|
edge.LastUpdate = time.Unix(int64(chanUpdate.Timestamp), 0)
|
|
edge.SigBytes = chanUpdate.Signature.ToSignatureBytes()
|
|
|
|
// To ensure that our signature is valid, we'll verify it ourself
|
|
// before committing it to the slice returned.
|
|
err = routing.ValidateChannelUpdateAnn(d.selfKey, info.Capacity, chanUpdate)
|
|
if err != nil {
|
|
return nil, nil, fmt.Errorf("generated invalid channel "+
|
|
"update sig: %v", err)
|
|
}
|
|
|
|
// Finally, we'll write the new edge policy to disk.
|
|
if err := d.cfg.Router.UpdateEdge(edge); err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// We'll also create the original channel announcement so the two can
|
|
// be broadcast along side each other (if necessary), but only if we
|
|
// have a full channel announcement for this channel.
|
|
var chanAnn *lnwire.ChannelAnnouncement
|
|
if info.AuthProof != nil {
|
|
chanID := lnwire.NewShortChanIDFromInt(info.ChannelID)
|
|
chanAnn = &lnwire.ChannelAnnouncement{
|
|
ShortChannelID: chanID,
|
|
NodeID1: info.NodeKey1Bytes,
|
|
NodeID2: info.NodeKey2Bytes,
|
|
ChainHash: info.ChainHash,
|
|
BitcoinKey1: info.BitcoinKey1Bytes,
|
|
Features: lnwire.NewRawFeatureVector(),
|
|
BitcoinKey2: info.BitcoinKey2Bytes,
|
|
ExtraOpaqueData: edge.ExtraOpaqueData,
|
|
}
|
|
chanAnn.NodeSig1, err = lnwire.NewSigFromRawSignature(
|
|
info.AuthProof.NodeSig1Bytes,
|
|
)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
chanAnn.NodeSig2, err = lnwire.NewSigFromRawSignature(
|
|
info.AuthProof.NodeSig2Bytes,
|
|
)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
chanAnn.BitcoinSig1, err = lnwire.NewSigFromRawSignature(
|
|
info.AuthProof.BitcoinSig1Bytes,
|
|
)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
chanAnn.BitcoinSig2, err = lnwire.NewSigFromRawSignature(
|
|
info.AuthProof.BitcoinSig2Bytes,
|
|
)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
}
|
|
|
|
return chanAnn, chanUpdate, err
|
|
}
|
|
|
|
// SyncManager returns the gossiper's SyncManager instance.
|
|
func (d *AuthenticatedGossiper) SyncManager() *SyncManager {
|
|
return d.syncMgr
|
|
}
|
|
|
|
// IsKeepAliveUpdate determines whether this channel update is considered a
|
|
// keep-alive update based on the previous channel update processed for the same
|
|
// direction.
|
|
func IsKeepAliveUpdate(update *lnwire.ChannelUpdate,
|
|
prev *channeldb.ChannelEdgePolicy) bool {
|
|
|
|
// Both updates should be from the same direction.
|
|
if update.ChannelFlags&lnwire.ChanUpdateDirection !=
|
|
prev.ChannelFlags&lnwire.ChanUpdateDirection {
|
|
return false
|
|
}
|
|
|
|
// The timestamp should always increase for a keep-alive update.
|
|
timestamp := time.Unix(int64(update.Timestamp), 0)
|
|
if !timestamp.After(prev.LastUpdate) {
|
|
return false
|
|
}
|
|
|
|
// None of the remaining fields should change for a keep-alive update.
|
|
if update.ChannelFlags.IsDisabled() != prev.ChannelFlags.IsDisabled() {
|
|
return false
|
|
}
|
|
if lnwire.MilliSatoshi(update.BaseFee) != prev.FeeBaseMSat {
|
|
return false
|
|
}
|
|
if lnwire.MilliSatoshi(update.FeeRate) != prev.FeeProportionalMillionths {
|
|
return false
|
|
}
|
|
if update.TimeLockDelta != prev.TimeLockDelta {
|
|
return false
|
|
}
|
|
if update.HtlcMinimumMsat != prev.MinHTLC {
|
|
return false
|
|
}
|
|
if update.MessageFlags.HasMaxHtlc() && !prev.MessageFlags.HasMaxHtlc() {
|
|
return false
|
|
}
|
|
if update.HtlcMaximumMsat != prev.MaxHTLC {
|
|
return false
|
|
}
|
|
if !bytes.Equal(update.ExtraOpaqueData, prev.ExtraOpaqueData) {
|
|
return false
|
|
}
|
|
return true
|
|
}
|