netann/channel_update: exposes channel update helpers moved from server
This commit is contained in:
Conner Fromknecht
parent
81783a60dc
commit
1a7fd6e6f1
141
netann/channel_update.go
Normal file
141
netann/channel_update.go
Normal file
@ -0,0 +1,141 @@
|
||||
package netann
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"time"
|
||||
|
||||
"github.com/btcsuite/btcd/btcec"
|
||||
"github.com/lightningnetwork/lnd/channeldb"
|
||||
"github.com/lightningnetwork/lnd/lnwallet"
|
||||
"github.com/lightningnetwork/lnd/lnwire"
|
||||
)
|
||||
|
||||
// ChannelUpdateModifier is a closure that makes in-place modifications to an
|
||||
// lnwire.ChannelUpdate.
|
||||
type ChannelUpdateModifier func(*lnwire.ChannelUpdate)
|
||||
|
||||
// ChannelUpdateSetDisable sets the disabled channel flag if disabled is true,
|
||||
// and clears the bit otherwise.
|
||||
func ChannelUpdateSetDisable(disabled bool) ChannelUpdateModifier {
|
||||
return func(update *lnwire.ChannelUpdate) {
|
||||
if disabled {
|
||||
// Set the bit responsible for marking a channel as
|
||||
// disabled.
|
||||
update.ChannelFlags |= lnwire.ChanUpdateDisabled
|
||||
} else {
|
||||
// Clear the bit responsible for marking a channel as
|
||||
// disabled.
|
||||
update.ChannelFlags &= ^lnwire.ChanUpdateDisabled
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// SignChannelUpdate applies the given modifiers to the passed
|
||||
// lnwire.ChannelUpdate, then signs the resulting update. The provided update
|
||||
// should be the most recent, valid update, otherwise the timestamp may not
|
||||
// monotonically increase from the prior.
|
||||
//
|
||||
// NOTE: This method modifies the given update.
|
||||
func SignChannelUpdate(signer lnwallet.MessageSigner, pubKey *btcec.PublicKey,
|
||||
update *lnwire.ChannelUpdate, mods ...ChannelUpdateModifier) error {
|
||||
|
||||
// Apply the requested changes to the channel update.
|
||||
for _, modifier := range mods {
|
||||
modifier(update)
|
||||
}
|
||||
|
||||
// Update the message's timestamp to the current time. If the update's
|
||||
// current time is already in the future, we increment the prior value
|
||||
// to ensure the timestamps monotonically increase, otherwise the
|
||||
// update won't propagate.
|
||||
newTimestamp := uint32(time.Now().Unix())
|
||||
if newTimestamp <= update.Timestamp {
|
||||
newTimestamp = update.Timestamp + 1
|
||||
}
|
||||
update.Timestamp = newTimestamp
|
||||
|
||||
chanUpdateMsg, err := update.DataToSign()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Create the DER-encoded ECDSA signature over the message digest.
|
||||
sig, err := signer.SignMessage(pubKey, chanUpdateMsg)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Parse the DER-encoded signature into a fixed-size 64-byte array.
|
||||
update.Signature, err = lnwire.NewSigFromSignature(sig)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// ExtractChannelUpdate attempts to retrieve a lnwire.ChannelUpdate message from
|
||||
// an edge's info and a set of routing policies.
|
||||
//
|
||||
// NOTE: The passed policies can be nil.
|
||||
func ExtractChannelUpdate(ownerPubKey []byte,
|
||||
info *channeldb.ChannelEdgeInfo,
|
||||
policies ...*channeldb.ChannelEdgePolicy) (
|
||||
*lnwire.ChannelUpdate, error) {
|
||||
|
||||
// Helper function to extract the owner of the given policy.
|
||||
owner := func(edge *channeldb.ChannelEdgePolicy) []byte {
|
||||
var pubKey *btcec.PublicKey
|
||||
if edge.ChannelFlags&lnwire.ChanUpdateDirection == 0 {
|
||||
pubKey, _ = info.NodeKey1()
|
||||
} else {
|
||||
pubKey, _ = info.NodeKey2()
|
||||
}
|
||||
|
||||
// If pubKey was not found, just return nil.
|
||||
if pubKey == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
return pubKey.SerializeCompressed()
|
||||
}
|
||||
|
||||
// Extract the channel update from the policy we own, if any.
|
||||
for _, edge := range policies {
|
||||
if edge != nil && bytes.Equal(ownerPubKey, owner(edge)) {
|
||||
return ChannelUpdateFromEdge(info, edge)
|
||||
}
|
||||
}
|
||||
|
||||
return nil, fmt.Errorf("unable to extract ChannelUpdate for channel %v",
|
||||
info.ChannelPoint)
|
||||
}
|
||||
|
||||
// ChannelUpdateFromEdge reconstructs a signed ChannelUpdate from the given edge
|
||||
// info and policy.
|
||||
func ChannelUpdateFromEdge(info *channeldb.ChannelEdgeInfo,
|
||||
policy *channeldb.ChannelEdgePolicy) (*lnwire.ChannelUpdate, error) {
|
||||
|
||||
update := &lnwire.ChannelUpdate{
|
||||
ChainHash: info.ChainHash,
|
||||
ShortChannelID: lnwire.NewShortChanIDFromInt(policy.ChannelID),
|
||||
Timestamp: uint32(policy.LastUpdate.Unix()),
|
||||
ChannelFlags: policy.ChannelFlags,
|
||||
MessageFlags: policy.MessageFlags,
|
||||
TimeLockDelta: policy.TimeLockDelta,
|
||||
HtlcMinimumMsat: policy.MinHTLC,
|
||||
HtlcMaximumMsat: policy.MaxHTLC,
|
||||
BaseFee: uint32(policy.FeeBaseMSat),
|
||||
FeeRate: uint32(policy.FeeProportionalMillionths),
|
||||
ExtraOpaqueData: policy.ExtraOpaqueData,
|
||||
}
|
||||
|
||||
var err error
|
||||
update.Signature, err = lnwire.NewSigFromRawSignature(policy.SigBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return update, nil
|
||||
}
|
||||
104
server.go
104
server.go
@ -3017,34 +3017,11 @@ func (s *server) announceChanStatus(op wire.OutPoint, disabled bool) error {
|
||||
return err
|
||||
}
|
||||
|
||||
if disabled {
|
||||
// Set the bit responsible for marking a channel as disabled.
|
||||
chanUpdate.ChannelFlags |= lnwire.ChanUpdateDisabled
|
||||
} else {
|
||||
// Clear the bit responsible for marking a channel as disabled.
|
||||
chanUpdate.ChannelFlags &= ^lnwire.ChanUpdateDisabled
|
||||
}
|
||||
|
||||
// We must now update the message's timestamp and generate a new
|
||||
// signature.
|
||||
newTimestamp := uint32(time.Now().Unix())
|
||||
if newTimestamp <= chanUpdate.Timestamp {
|
||||
// Timestamp must increase for message to propagate.
|
||||
newTimestamp = chanUpdate.Timestamp + 1
|
||||
}
|
||||
chanUpdate.Timestamp = newTimestamp
|
||||
|
||||
chanUpdateMsg, err := chanUpdate.DataToSign()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
pubKey := s.identityPriv.PubKey()
|
||||
sig, err := s.nodeSigner.SignMessage(pubKey, chanUpdateMsg)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
chanUpdate.Signature, err = lnwire.NewSigFromSignature(sig)
|
||||
// Now, sign a new update toggling the disable bit.
|
||||
err = netann.SignChannelUpdate(
|
||||
s.nodeSigner, s.identityPriv.PubKey(), chanUpdate,
|
||||
netann.ChannelUpdateSetDisable(disabled),
|
||||
)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
@ -3077,7 +3054,7 @@ func (s *server) fetchLastChanUpdateByOutPoint(op wire.OutPoint) (
|
||||
}
|
||||
|
||||
pubKey := s.identityPriv.PubKey().SerializeCompressed()
|
||||
return extractChannelUpdate(pubKey, info, edge1, edge2)
|
||||
return netann.ExtractChannelUpdate(pubKey, info, edge1, edge2)
|
||||
}
|
||||
|
||||
// fetchLastChanUpdate returns a function which is able to retrieve our latest
|
||||
@ -3091,75 +3068,12 @@ func (s *server) fetchLastChanUpdate() func(lnwire.ShortChannelID) (
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return extractChannelUpdate(ourPubKey[:], info, edge1, edge2)
|
||||
return netann.ExtractChannelUpdate(
|
||||
ourPubKey[:], info, edge1, edge2,
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
// extractChannelUpdate attempts to retrieve a lnwire.ChannelUpdate message
|
||||
// from an edge's info and a set of routing policies.
|
||||
// NOTE: the passed policies can be nil.
|
||||
func extractChannelUpdate(ownerPubKey []byte,
|
||||
info *channeldb.ChannelEdgeInfo,
|
||||
policies ...*channeldb.ChannelEdgePolicy) (
|
||||
*lnwire.ChannelUpdate, error) {
|
||||
|
||||
// Helper function to extract the owner of the given policy.
|
||||
owner := func(edge *channeldb.ChannelEdgePolicy) []byte {
|
||||
var pubKey *btcec.PublicKey
|
||||
switch {
|
||||
case edge.ChannelFlags&lnwire.ChanUpdateDirection == 0:
|
||||
pubKey, _ = info.NodeKey1()
|
||||
case edge.ChannelFlags&lnwire.ChanUpdateDirection == 1:
|
||||
pubKey, _ = info.NodeKey2()
|
||||
}
|
||||
|
||||
// If pubKey was not found, just return nil.
|
||||
if pubKey == nil {
|
||||
return nil
|
||||
}
|
||||
|
||||
return pubKey.SerializeCompressed()
|
||||
}
|
||||
|
||||
// Extract the channel update from the policy we own, if any.
|
||||
for _, edge := range policies {
|
||||
if edge != nil && bytes.Equal(ownerPubKey, owner(edge)) {
|
||||
return createChannelUpdate(info, edge)
|
||||
}
|
||||
}
|
||||
|
||||
return nil, fmt.Errorf("unable to extract ChannelUpdate for channel %v",
|
||||
info.ChannelPoint)
|
||||
}
|
||||
|
||||
// createChannelUpdate reconstructs a signed ChannelUpdate from the given edge
|
||||
// info and policy.
|
||||
func createChannelUpdate(info *channeldb.ChannelEdgeInfo,
|
||||
policy *channeldb.ChannelEdgePolicy) (*lnwire.ChannelUpdate, error) {
|
||||
|
||||
update := &lnwire.ChannelUpdate{
|
||||
ChainHash: info.ChainHash,
|
||||
ShortChannelID: lnwire.NewShortChanIDFromInt(policy.ChannelID),
|
||||
Timestamp: uint32(policy.LastUpdate.Unix()),
|
||||
MessageFlags: policy.MessageFlags,
|
||||
ChannelFlags: policy.ChannelFlags,
|
||||
TimeLockDelta: policy.TimeLockDelta,
|
||||
HtlcMinimumMsat: policy.MinHTLC,
|
||||
HtlcMaximumMsat: policy.MaxHTLC,
|
||||
BaseFee: uint32(policy.FeeBaseMSat),
|
||||
FeeRate: uint32(policy.FeeProportionalMillionths),
|
||||
ExtraOpaqueData: policy.ExtraOpaqueData,
|
||||
}
|
||||
|
||||
var err error
|
||||
update.Signature, err = lnwire.NewSigFromRawSignature(policy.SigBytes)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return update, nil
|
||||
}
|
||||
|
||||
// applyChannelUpdate applies the channel update to the different sub-systems of
|
||||
// the server.
|
||||
func (s *server) applyChannelUpdate(update *lnwire.ChannelUpdate) error {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user