12583319996

Committed 02 Jan 2025 01:38PM UTC coverage: 57.522% (-1.1%) from 58.598%

Build # 12583319996

Build Type

Pull #9361

github

Committed by

starius

Commit Message

fn/ContextGuard: use context.AfterFunc to wait

Simplifies context cancellation handling by using context.AfterFunc instead of a
goroutine to wait for context cancellation. This approach avoids the overhead of
a goroutine during the waiting period.

For ctxQuitUnsafe, since g.quit is closed only in the Quit method (which also
cancels all associated contexts), waiting on context cancellation ensures the
same behavior without unnecessary dependency on g.quit.

Added a test to ensure that the Create method does not launch any goroutines.

Pull Request Pull Request #9361: fn: optimize context guard

Run Details

102587 of 178344 relevant lines covered (57.52%)

24734.33 hits per line

Source File
Press 'n' to go to next uncovered line, 'b' for previous

0.0

/chanrestore.go

package lnd

import (
        "fmt"
        "math"
        "net"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/chaincfg"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/wire"
        "github.com/lightningnetwork/lnd/chanbackup"
        "github.com/lightningnetwork/lnd/channeldb"
        "github.com/lightningnetwork/lnd/contractcourt"
        "github.com/lightningnetwork/lnd/keychain"
        "github.com/lightningnetwork/lnd/lnwire"
        "github.com/lightningnetwork/lnd/shachain"
)

const (
        // mainnetSCBLaunchBlock is the approximate block height of the bitcoin
        // mainnet chain of the date when SCBs first were released in lnd
        // (v0.6.0-beta). The block date is 4/15/2019, 10:54 PM UTC.
        mainnetSCBLaunchBlock = 571800

        // testnetSCBLaunchBlock is the approximate block height of the bitcoin
        // testnet3 chain of the date when SCBs first were released in lnd
        // (v0.6.0-beta). The block date is 4/16/2019, 08:04 AM UTC.
        testnetSCBLaunchBlock = 1489300
)

// chanDBRestorer is an implementation of the chanbackup.ChannelRestorer
// interface that is able to properly map a Single backup, into a
// channeldb.ChannelShell which is required to fully restore a channel. We also
// need the secret key chain in order obtain the prior shachain root so we can
// verify the DLP protocol as initiated by the remote node.
type chanDBRestorer struct {
        db *channeldb.ChannelStateDB

        secretKeys keychain.SecretKeyRing

        chainArb *contractcourt.ChainArbitrator
}

// openChannelShell maps the static channel back up into an open channel
// "shell". We say shell as this doesn't include all the information required
// to continue to use the channel, only the minimal amount of information to
// insert this shell channel back into the database.
func (c *chanDBRestorer) openChannelShell(backup chanbackup.Single) (
        *channeldb.ChannelShell, error) {

        var err error

        // Each of the keys in our local channel config only have their
        // locators populate, so we'll re-derive the raw key now as we'll need
        // it in order to carry out the DLP protocol.
        backup.LocalChanCfg.MultiSigKey, err = c.secretKeys.DeriveKey(
                backup.LocalChanCfg.MultiSigKey.KeyLocator,
        )
        if err != nil {
                return nil, fmt.Errorf("unable to derive multi sig key: %w",
                        err)
        }
        backup.LocalChanCfg.RevocationBasePoint, err = c.secretKeys.DeriveKey(
                backup.LocalChanCfg.RevocationBasePoint.KeyLocator,
        )
        if err != nil {
                return nil, fmt.Errorf("unable to derive revocation key: %w",
                        err)
        }
        backup.LocalChanCfg.PaymentBasePoint, err = c.secretKeys.DeriveKey(
                backup.LocalChanCfg.PaymentBasePoint.KeyLocator,
        )
        if err != nil {
                return nil, fmt.Errorf("unable to derive payment key: %w", err)
        }
        backup.LocalChanCfg.DelayBasePoint, err = c.secretKeys.DeriveKey(
                backup.LocalChanCfg.DelayBasePoint.KeyLocator,
        )
        if err != nil {
                return nil, fmt.Errorf("unable to derive delay key: %w", err)
        }
        backup.LocalChanCfg.HtlcBasePoint, err = c.secretKeys.DeriveKey(
                backup.LocalChanCfg.HtlcBasePoint.KeyLocator,
        )
        if err != nil {
                return nil, fmt.Errorf("unable to derive htlc key: %w", err)
        }

        // The shachain root that seeds RevocationProducer for this channel.
        // It currently has two possible formats.
        var revRoot *chainhash.Hash

        // If the PubKey field is non-nil, then this shachain root is using the
        // legacy non-ECDH scheme.
        if backup.ShaChainRootDesc.PubKey != nil {
                ltndLog.Debugf("Using legacy revocation producer format for "+
                        "channel point %v", backup.FundingOutpoint)

                // Obtain the private key for the shachain root from the
                // encoded public key.
                privKey, err := c.secretKeys.DerivePrivKey(
                        backup.ShaChainRootDesc,
                )
                if err != nil {
                        return nil, fmt.Errorf("could not derive private key "+
                                "for legacy channel revocation root format: "+
                                "%v", err)
                }

                revRoot, err = chainhash.NewHash(privKey.Serialize())
                if err != nil {
                        return nil, err
                }
        } else {
                ltndLog.Debugf("Using new ECDH revocation producer format "+
                        "for channel point %v", backup.FundingOutpoint)

                // This is the scheme in which the shachain root is derived via
                // an ECDH operation on the private key of ShaChainRootDesc and
                // our public multisig key.
                ecdh, err := c.secretKeys.ECDH(
                        backup.ShaChainRootDesc,
                        backup.LocalChanCfg.MultiSigKey.PubKey,
                )
                if err != nil {
                        return nil, fmt.Errorf("unable to derive shachain "+
                                "root: %v", err)
                }

                ch := chainhash.Hash(ecdh)
                revRoot = &ch
        }

        shaChainProducer := shachain.NewRevocationProducer(*revRoot)

        var chanType channeldb.ChannelType
        switch backup.Version {
        case chanbackup.DefaultSingleVersion:
                chanType = channeldb.SingleFunderBit

        case chanbackup.TweaklessCommitVersion:
                chanType = channeldb.SingleFunderTweaklessBit

        case chanbackup.AnchorsCommitVersion:
                chanType = channeldb.AnchorOutputsBit
                chanType |= channeldb.SingleFunderTweaklessBit

        case chanbackup.AnchorsZeroFeeHtlcTxCommitVersion:
                chanType = channeldb.ZeroHtlcTxFeeBit
                chanType |= channeldb.AnchorOutputsBit
                chanType |= channeldb.SingleFunderTweaklessBit

        case chanbackup.ScriptEnforcedLeaseVersion:
                chanType = channeldb.LeaseExpirationBit
                chanType |= channeldb.ZeroHtlcTxFeeBit
                chanType |= channeldb.AnchorOutputsBit
                chanType |= channeldb.SingleFunderTweaklessBit

        case chanbackup.SimpleTaprootVersion:
                chanType = channeldb.ZeroHtlcTxFeeBit
                chanType |= channeldb.AnchorOutputsBit
                chanType |= channeldb.SingleFunderTweaklessBit
                chanType |= channeldb.SimpleTaprootFeatureBit

        case chanbackup.TapscriptRootVersion:
                chanType = channeldb.ZeroHtlcTxFeeBit
                chanType |= channeldb.AnchorOutputsBit
                chanType |= channeldb.SingleFunderTweaklessBit
                chanType |= channeldb.SimpleTaprootFeatureBit
                chanType |= channeldb.TapscriptRootBit

        default:
                return nil, fmt.Errorf("unknown Single version: %w", err)
        }

        ltndLog.Infof("SCB Recovery: created channel shell for ChannelPoint"+
                "(%v), chan_type=%v", backup.FundingOutpoint, chanType)

        chanShell := channeldb.ChannelShell{
                NodeAddrs: backup.Addresses,
                Chan: &channeldb.OpenChannel{
                        ChanType:                chanType,
                        ChainHash:               backup.ChainHash,
                        IsInitiator:             backup.IsInitiator,
                        Capacity:                backup.Capacity,
                        FundingOutpoint:         backup.FundingOutpoint,
                        ShortChannelID:          backup.ShortChannelID,
                        IdentityPub:             backup.RemoteNodePub,
                        IsPending:               false,
                        LocalChanCfg:            backup.LocalChanCfg,
                        RemoteChanCfg:           backup.RemoteChanCfg,
                        RemoteCurrentRevocation: backup.RemoteNodePub,
                        RevocationStore:         shachain.NewRevocationStore(),
                        RevocationProducer:      shaChainProducer,
                        ThawHeight:              backup.LeaseExpiry,
                },
        }

        return &chanShell, nil
}

// RestoreChansFromSingles attempts to map the set of single channel backups to
// channel shells that will be stored persistently. Once these shells have been
// stored on disk, we'll be able to connect to the channel peer an execute the
// data loss recovery protocol.
//
// NOTE: Part of the chanbackup.ChannelRestorer interface.
func (c *chanDBRestorer) RestoreChansFromSingles(backups ...chanbackup.Single) error {
        channelShells := make([]*channeldb.ChannelShell, 0, len(backups))
        firstChanHeight := uint32(math.MaxUint32)
        for _, backup := range backups {
                chanShell, err := c.openChannelShell(backup)
                if err != nil {
                        return err
                }

                // Find the block height of the earliest channel in this backup.
                chanHeight := chanShell.Chan.ShortChanID().BlockHeight
                if chanHeight != 0 && chanHeight < firstChanHeight {
                        firstChanHeight = chanHeight
                }

                channelShells = append(channelShells, chanShell)
        }

        // In case there were only unconfirmed channels, we will have to scan
        // the chain beginning from the launch date of SCBs.
        if firstChanHeight == math.MaxUint32 {
                chainHash := channelShells[0].Chan.ChainHash
                switch {
                case chainHash.IsEqual(chaincfg.MainNetParams.GenesisHash):
                        firstChanHeight = mainnetSCBLaunchBlock

                case chainHash.IsEqual(chaincfg.TestNet3Params.GenesisHash):
                        firstChanHeight = testnetSCBLaunchBlock

                default:
                        // Worst case: We have no height hint and start at
                        // block 1. Should only happen for SCBs in regtest
                        // and simnet.
                        firstChanHeight = 1
                }
        }

        // If there were channels in the backup that were not confirmed at the
        // time of the backup creation, they won't have a block height in the
        // ShortChanID which would lead to an error in the chain watcher.
        // We want to at least set the funding broadcast height that the chain
        // watcher can use instead. We have two possible fallback values for
        // the broadcast height that we are going to try here.
        for _, chanShell := range channelShells {
                channel := chanShell.Chan

                switch {
                // Fallback case 1: This is an unconfirmed channel from an old
                // backup file where we didn't have any workaround in place and
                // the short channel ID is 0:0:0. Best we can do here is set the
                // funding broadcast height to a reasonable value that we
                // determined earlier.
                case channel.ShortChanID().BlockHeight == 0:
                        channel.SetBroadcastHeight(firstChanHeight)

                // Fallback case 2: It is extremely unlikely at this point that
                // a channel we are trying to restore has a coinbase funding TX.
                // Therefore we can be quite certain that if the TxIndex is
                // zero but the block height wasn't, it was an unconfirmed
                // channel where we used the BlockHeight to encode the funding
                // TX broadcast height. To not end up with an invalid short
                // channel ID that looks valid, we restore the "original"
                // unconfirmed one here.
                case channel.ShortChannelID.TxIndex == 0:
                        broadcastHeight := channel.ShortChannelID.BlockHeight
                        channel.SetBroadcastHeight(broadcastHeight)
                        channel.ShortChannelID.BlockHeight = 0
                }
        }

        ltndLog.Infof("Inserting %v SCB channel shells into DB",
                len(channelShells))

        // Now that we have all the backups mapped into a series of Singles,
        // we'll insert them all into the database.
        if err := c.db.RestoreChannelShells(channelShells...); err != nil {
                return err
        }

        ltndLog.Infof("Informing chain watchers of new restored channels")

        // Create a slice of channel points.
        chanPoints := make([]wire.OutPoint, 0, len(channelShells))

        // Finally, we'll need to inform the chain arbitrator of these new
        // channels so we'll properly watch for their ultimate closure on chain
        // and sweep them via the DLP.
        for _, restoredChannel := range channelShells {
                err := c.chainArb.WatchNewChannel(restoredChannel.Chan)
                if err != nil {
                        return err
                }

                chanPoints = append(
                        chanPoints, restoredChannel.Chan.FundingOutpoint,
                )
        }

        // With all the channels restored, we'll now re-send the blockbeat.
        c.chainArb.RedispatchBlockbeat(chanPoints)

        return nil
}

// A compile-time constraint to ensure chanDBRestorer implements
// chanbackup.ChannelRestorer.
var _ chanbackup.ChannelRestorer = (*chanDBRestorer)(nil)

// ConnectPeer attempts to connect to the target node at the set of available
// addresses. Once this method returns with a non-nil error, the connector
// should attempt to persistently connect to the target peer in the background
// as a persistent attempt.
//
// NOTE: Part of the chanbackup.PeerConnector interface.
func (s *server) ConnectPeer(nodePub *btcec.PublicKey, addrs []net.Addr) error {
        // Before we connect to the remote peer, we'll remove any connections
        // to ensure the new connection is created after this new link/channel
        // is known.
        if err := s.DisconnectPeer(nodePub); err != nil {
                ltndLog.Infof("Peer(%x) is already connected, proceeding "+
                        "with chan restore", nodePub.SerializeCompressed())
        }

        // For each of the known addresses, we'll attempt to launch a
        // persistent connection to the (pub, addr) pair. In the event that any
        // of them connect, all the other stale requests will be canceled.
        for _, addr := range addrs {
                netAddr := &lnwire.NetAddress{
                        IdentityKey: nodePub,
                        Address:     addr,
                }

                ltndLog.Infof("Attempting to connect to %v for SCB restore "+
                        "DLP", netAddr)

                // Attempt to connect to the peer using this full address. If
                // we're unable to connect to them, then we'll try the next
                // address in place of it.
                err := s.ConnectToPeer(netAddr, true, s.cfg.ConnectionTimeout)

                // If we're already connected to this peer, then we don't
                // consider this an error, so we'll exit here.
                if _, ok := err.(*errPeerAlreadyConnected); ok {
                        return nil

                } else if err != nil {
                        // Otherwise, something else happened, so we'll try the
                        // next address.
                        ltndLog.Errorf("unable to connect to %v to "+
                                "complete SCB restore: %v", netAddr, err)
                        continue
                }

                // If we connected no problem, then we can exit early as our
                // job here is done.
                return nil
        }

        return fmt.Errorf("unable to connect to peer %x for SCB restore",
                nodePub.SerializeCompressed())
}

1	package lnd
2
3	import (
4	"fmt"
5	"math"
6	"net"
7
8	"github.com/btcsuite/btcd/btcec/v2"
9	"github.com/btcsuite/btcd/chaincfg"
10	"github.com/btcsuite/btcd/chaincfg/chainhash"
11	"github.com/btcsuite/btcd/wire"
12	"github.com/lightningnetwork/lnd/chanbackup"
13	"github.com/lightningnetwork/lnd/channeldb"
14	"github.com/lightningnetwork/lnd/contractcourt"
15	"github.com/lightningnetwork/lnd/keychain"
16	"github.com/lightningnetwork/lnd/lnwire"
17	"github.com/lightningnetwork/lnd/shachain"
18	)
19
20	const (
21	// mainnetSCBLaunchBlock is the approximate block height of the bitcoin
22	// mainnet chain of the date when SCBs first were released in lnd
23	// (v0.6.0-beta). The block date is 4/15/2019, 10:54 PM UTC.
24	mainnetSCBLaunchBlock = 571800
25
26	// testnetSCBLaunchBlock is the approximate block height of the bitcoin
27	// testnet3 chain of the date when SCBs first were released in lnd
28	// (v0.6.0-beta). The block date is 4/16/2019, 08:04 AM UTC.
29	testnetSCBLaunchBlock = 1489300
30	)
31
32	// chanDBRestorer is an implementation of the chanbackup.ChannelRestorer
33	// interface that is able to properly map a Single backup, into a
34	// channeldb.ChannelShell which is required to fully restore a channel. We also
35	// need the secret key chain in order obtain the prior shachain root so we can
36	// verify the DLP protocol as initiated by the remote node.
37	type chanDBRestorer struct {
38	db *channeldb.ChannelStateDB
39
40	secretKeys keychain.SecretKeyRing
41
42	chainArb *contractcourt.ChainArbitrator
43	}
44
45	// openChannelShell maps the static channel back up into an open channel
46	// "shell". We say shell as this doesn't include all the information required
47	// to continue to use the channel, only the minimal amount of information to
48	// insert this shell channel back into the database.
49	func (c *chanDBRestorer) openChannelShell(backup chanbackup.Single) (
50	*channeldb.ChannelShell, error) {	×
51		×
52	var err error	×
53		×
54	// Each of the keys in our local channel config only have their	×
55	// locators populate, so we'll re-derive the raw key now as we'll need	×
56	// it in order to carry out the DLP protocol.	×
57	backup.LocalChanCfg.MultiSigKey, err = c.secretKeys.DeriveKey(	×
58	backup.LocalChanCfg.MultiSigKey.KeyLocator,	×
59	)	×
60	if err != nil {	×
61	return nil, fmt.Errorf("unable to derive multi sig key: %w",	×
62	err)	×
63	}	×
64	backup.LocalChanCfg.RevocationBasePoint, err = c.secretKeys.DeriveKey(	×
65	backup.LocalChanCfg.RevocationBasePoint.KeyLocator,	×
66	)	×
67	if err != nil {	×
68	return nil, fmt.Errorf("unable to derive revocation key: %w",	×
69	err)	×
70	}	×
71	backup.LocalChanCfg.PaymentBasePoint, err = c.secretKeys.DeriveKey(	×
72	backup.LocalChanCfg.PaymentBasePoint.KeyLocator,	×
73	)	×
74	if err != nil {	×
75	return nil, fmt.Errorf("unable to derive payment key: %w", err)	×
76	}	×
77	backup.LocalChanCfg.DelayBasePoint, err = c.secretKeys.DeriveKey(	×
78	backup.LocalChanCfg.DelayBasePoint.KeyLocator,	×
79	)	×
80	if err != nil {	×
81	return nil, fmt.Errorf("unable to derive delay key: %w", err)	×
82	}	×
83	backup.LocalChanCfg.HtlcBasePoint, err = c.secretKeys.DeriveKey(	×
84	backup.LocalChanCfg.HtlcBasePoint.KeyLocator,	×
85	)	×
86	if err != nil {	×
87	return nil, fmt.Errorf("unable to derive htlc key: %w", err)	×
88	}	×
89
90	// The shachain root that seeds RevocationProducer for this channel.
91	// It currently has two possible formats.
92	var revRoot *chainhash.Hash	×
93		×
94	// If the PubKey field is non-nil, then this shachain root is using the	×
95	// legacy non-ECDH scheme.	×
96	if backup.ShaChainRootDesc.PubKey != nil {	×
97	ltndLog.Debugf("Using legacy revocation producer format for "+	×
98	"channel point %v", backup.FundingOutpoint)	×
99		×
100	// Obtain the private key for the shachain root from the	×
101	// encoded public key.	×
102	privKey, err := c.secretKeys.DerivePrivKey(	×
103	backup.ShaChainRootDesc,	×
104	)	×
105	if err != nil {	×
106	return nil, fmt.Errorf("could not derive private key "+	×
107	"for legacy channel revocation root format: "+	×
108	"%v", err)	×
109	}	×
110
111	revRoot, err = chainhash.NewHash(privKey.Serialize())	×
112	if err != nil {	×
113	return nil, err	×
114	}	×
115	} else {	×
116	ltndLog.Debugf("Using new ECDH revocation producer format "+	×
117	"for channel point %v", backup.FundingOutpoint)	×
118		×
119	// This is the scheme in which the shachain root is derived via	×
120	// an ECDH operation on the private key of ShaChainRootDesc and	×
121	// our public multisig key.	×
122	ecdh, err := c.secretKeys.ECDH(	×
123	backup.ShaChainRootDesc,	×
124	backup.LocalChanCfg.MultiSigKey.PubKey,	×
125	)	×
126	if err != nil {	×
127	return nil, fmt.Errorf("unable to derive shachain "+	×
128	"root: %v", err)	×
129	}	×
130
131	ch := chainhash.Hash(ecdh)	×
132	revRoot = &ch	×
133	}
134
135	shaChainProducer := shachain.NewRevocationProducer(*revRoot)	×
136		×
137	var chanType channeldb.ChannelType	×
138	switch backup.Version {	×
139	case chanbackup.DefaultSingleVersion:	×
140	chanType = channeldb.SingleFunderBit	×
141
142	case chanbackup.TweaklessCommitVersion:	×
143	chanType = channeldb.SingleFunderTweaklessBit	×
144
145	case chanbackup.AnchorsCommitVersion:	×
146	chanType = channeldb.AnchorOutputsBit	×
147	chanType \|= channeldb.SingleFunderTweaklessBit	×
148
149	case chanbackup.AnchorsZeroFeeHtlcTxCommitVersion:	×
150	chanType = channeldb.ZeroHtlcTxFeeBit	×
151	chanType \|= channeldb.AnchorOutputsBit	×
152	chanType \|= channeldb.SingleFunderTweaklessBit	×
153
154	case chanbackup.ScriptEnforcedLeaseVersion:	×
155	chanType = channeldb.LeaseExpirationBit	×
156	chanType \|= channeldb.ZeroHtlcTxFeeBit	×
157	chanType \|= channeldb.AnchorOutputsBit	×
158	chanType \|= channeldb.SingleFunderTweaklessBit	×
159
160	case chanbackup.SimpleTaprootVersion:	×
161	chanType = channeldb.ZeroHtlcTxFeeBit	×
162	chanType \|= channeldb.AnchorOutputsBit	×
163	chanType \|= channeldb.SingleFunderTweaklessBit	×
164	chanType \|= channeldb.SimpleTaprootFeatureBit	×
165
166	case chanbackup.TapscriptRootVersion:	×
167	chanType = channeldb.ZeroHtlcTxFeeBit	×
168	chanType \|= channeldb.AnchorOutputsBit	×
169	chanType \|= channeldb.SingleFunderTweaklessBit	×
170	chanType \|= channeldb.SimpleTaprootFeatureBit	×
171	chanType \|= channeldb.TapscriptRootBit	×
172
173	default:	×
174	return nil, fmt.Errorf("unknown Single version: %w", err)	×
175	}
176
177	ltndLog.Infof("SCB Recovery: created channel shell for ChannelPoint"+	×
178	"(%v), chan_type=%v", backup.FundingOutpoint, chanType)	×
179		×
180	chanShell := channeldb.ChannelShell{	×
181	NodeAddrs: backup.Addresses,	×
182	Chan: &channeldb.OpenChannel{	×
183	ChanType: chanType,	×
184	ChainHash: backup.ChainHash,	×
185	IsInitiator: backup.IsInitiator,	×
186	Capacity: backup.Capacity,	×
187	FundingOutpoint: backup.FundingOutpoint,	×
188	ShortChannelID: backup.ShortChannelID,	×
189	IdentityPub: backup.RemoteNodePub,	×
190	IsPending: false,	×
191	LocalChanCfg: backup.LocalChanCfg,	×
192	RemoteChanCfg: backup.RemoteChanCfg,	×
193	RemoteCurrentRevocation: backup.RemoteNodePub,	×
194	RevocationStore: shachain.NewRevocationStore(),	×
195	RevocationProducer: shaChainProducer,	×
196	ThawHeight: backup.LeaseExpiry,	×
197	},	×
198	}	×
199		×
200	return &chanShell, nil	×
201	}
202
203	// RestoreChansFromSingles attempts to map the set of single channel backups to
204	// channel shells that will be stored persistently. Once these shells have been
205	// stored on disk, we'll be able to connect to the channel peer an execute the
206	// data loss recovery protocol.
207	//
208	// NOTE: Part of the chanbackup.ChannelRestorer interface.
209	func (c *chanDBRestorer) RestoreChansFromSingles(backups ...chanbackup.Single) error {	×
210	channelShells := make([]*channeldb.ChannelShell, 0, len(backups))	×
211	firstChanHeight := uint32(math.MaxUint32)	×
212	for _, backup := range backups {	×
213	chanShell, err := c.openChannelShell(backup)	×
214	if err != nil {	×
215	return err	×
216	}	×
217
218	// Find the block height of the earliest channel in this backup.
219	chanHeight := chanShell.Chan.ShortChanID().BlockHeight	×
220	if chanHeight != 0 && chanHeight < firstChanHeight {	×
221	firstChanHeight = chanHeight	×
222	}	×
223
224	channelShells = append(channelShells, chanShell)	×
225	}
226
227	// In case there were only unconfirmed channels, we will have to scan
228	// the chain beginning from the launch date of SCBs.
229	if firstChanHeight == math.MaxUint32 {	×
230	chainHash := channelShells[0].Chan.ChainHash	×
231	switch {	×
232	case chainHash.IsEqual(chaincfg.MainNetParams.GenesisHash):	×
233	firstChanHeight = mainnetSCBLaunchBlock	×
234
235	case chainHash.IsEqual(chaincfg.TestNet3Params.GenesisHash):	×
236	firstChanHeight = testnetSCBLaunchBlock	×
237
238	default:	×
239	// Worst case: We have no height hint and start at	×
240	// block 1. Should only happen for SCBs in regtest	×
241	// and simnet.	×
242	firstChanHeight = 1	×
243	}
244	}
245
246	// If there were channels in the backup that were not confirmed at the
247	// time of the backup creation, they won't have a block height in the
248	// ShortChanID which would lead to an error in the chain watcher.
249	// We want to at least set the funding broadcast height that the chain
250	// watcher can use instead. We have two possible fallback values for
251	// the broadcast height that we are going to try here.
252	for _, chanShell := range channelShells {	×
253	channel := chanShell.Chan	×
254		×
255	switch {	×
256	// Fallback case 1: This is an unconfirmed channel from an old
257	// backup file where we didn't have any workaround in place and
258	// the short channel ID is 0:0:0. Best we can do here is set the
259	// funding broadcast height to a reasonable value that we
260	// determined earlier.
261	case channel.ShortChanID().BlockHeight == 0:	×
262	channel.SetBroadcastHeight(firstChanHeight)	×
263
264	// Fallback case 2: It is extremely unlikely at this point that
265	// a channel we are trying to restore has a coinbase funding TX.
266	// Therefore we can be quite certain that if the TxIndex is
267	// zero but the block height wasn't, it was an unconfirmed
268	// channel where we used the BlockHeight to encode the funding
269	// TX broadcast height. To not end up with an invalid short
270	// channel ID that looks valid, we restore the "original"
271	// unconfirmed one here.
272	case channel.ShortChannelID.TxIndex == 0:	×
273	broadcastHeight := channel.ShortChannelID.BlockHeight	×
274	channel.SetBroadcastHeight(broadcastHeight)	×
275	channel.ShortChannelID.BlockHeight = 0	×
276	}
277	}
278
279	ltndLog.Infof("Inserting %v SCB channel shells into DB",	×
280	len(channelShells))	×
281		×
282	// Now that we have all the backups mapped into a series of Singles,	×
283	// we'll insert them all into the database.	×
284	if err := c.db.RestoreChannelShells(channelShells...); err != nil {	×
285	return err	×
286	}	×
287
288	ltndLog.Infof("Informing chain watchers of new restored channels")	×
289		×
290	// Create a slice of channel points.	×
291	chanPoints := make([]wire.OutPoint, 0, len(channelShells))	×
292		×
293	// Finally, we'll need to inform the chain arbitrator of these new	×
294	// channels so we'll properly watch for their ultimate closure on chain	×
295	// and sweep them via the DLP.	×
296	for _, restoredChannel := range channelShells {	×
297	err := c.chainArb.WatchNewChannel(restoredChannel.Chan)	×
298	if err != nil {	×
299	return err	×
300	}	×
301
302	chanPoints = append(	×
303	chanPoints, restoredChannel.Chan.FundingOutpoint,	×
304	)	×
305	}
306
307	// With all the channels restored, we'll now re-send the blockbeat.
308	c.chainArb.RedispatchBlockbeat(chanPoints)	×
309		×
310	return nil	×
311	}
312
313	// A compile-time constraint to ensure chanDBRestorer implements
314	// chanbackup.ChannelRestorer.
315	var _ chanbackup.ChannelRestorer = (*chanDBRestorer)(nil)
316
317	// ConnectPeer attempts to connect to the target node at the set of available
318	// addresses. Once this method returns with a non-nil error, the connector
319	// should attempt to persistently connect to the target peer in the background
320	// as a persistent attempt.
321	//
322	// NOTE: Part of the chanbackup.PeerConnector interface.
323	func (s server) ConnectPeer(nodePub btcec.PublicKey, addrs []net.Addr) error {	×
324	// Before we connect to the remote peer, we'll remove any connections	×
325	// to ensure the new connection is created after this new link/channel	×
326	// is known.	×
327	if err := s.DisconnectPeer(nodePub); err != nil {	×
328	ltndLog.Infof("Peer(%x) is already connected, proceeding "+	×
329	"with chan restore", nodePub.SerializeCompressed())	×
330	}	×
331
332	// For each of the known addresses, we'll attempt to launch a
333	// persistent connection to the (pub, addr) pair. In the event that any
334	// of them connect, all the other stale requests will be canceled.
335	for _, addr := range addrs {	×
336	netAddr := &lnwire.NetAddress{	×
337	IdentityKey: nodePub,	×
338	Address: addr,	×
339	}	×
340		×
341	ltndLog.Infof("Attempting to connect to %v for SCB restore "+	×
342	"DLP", netAddr)	×
343		×
344	// Attempt to connect to the peer using this full address. If	×
345	// we're unable to connect to them, then we'll try the next	×
346	// address in place of it.	×
347	err := s.ConnectToPeer(netAddr, true, s.cfg.ConnectionTimeout)	×
348		×
349	// If we're already connected to this peer, then we don't	×
350	// consider this an error, so we'll exit here.	×
351	if _, ok := err.(*errPeerAlreadyConnected); ok {	×
352	return nil	×
353		×
354	} else if err != nil {	×
355	// Otherwise, something else happened, so we'll try the	×
356	// next address.	×
357	ltndLog.Errorf("unable to connect to %v to "+	×
358	"complete SCB restore: %v", netAddr, err)	×
359	continue	×
360	}
361
362	// If we connected no problem, then we can exit early as our
363	// job here is done.
364	return nil	×
365	}
366
367	return fmt.Errorf("unable to connect to peer %x for SCB restore",	×
368	nodePub.SerializeCompressed())	×
369	}

lightningnetwork / lnd / 12583319996

Source File Press 'n' to go to next uncovered line, 'b' for previous

Source File
Press 'n' to go to next uncovered line, 'b' for previous