12118348650

Committed 02 Dec 2024 11:25AM UTC coverage: 58.552% (-0.4%) from 58.977%

Build # 12118348650

Build Type

Pull #9175

github

Committed by

ellemouton

Commit Message

lnwire: add NodeAnnouncement2

Pull Request Pull Request #9175: lnwire+netann: update structure of g175 messages to be pure TLV

Run Details

405 of 571 new or added lines in 11 files covered. (70.93%)

1754 existing lines in 33 files now uncovered.

133774 of 228469 relevant lines covered (58.55%)

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57.24

/lnwire/channel_announcement_2.go

package lnwire

import (
        "bytes"
        "io"

        "github.com/btcsuite/btcd/chaincfg"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/lightningnetwork/lnd/tlv"
)

// ChannelAnnouncement2 message is used to announce the existence of a taproot
// channel between two peers in the network.
type ChannelAnnouncement2 struct {
        // ChainHash denotes the target chain that this channel was opened
        // within. This value should be the genesis hash of the target chain.
        ChainHash tlv.RecordT[tlv.TlvType0, chainhash.Hash]

        // Features is the feature vector that encodes the features supported
        // by the target node. This field can be used to signal the type of the
        // channel, or modifications to the fields that would normally follow
        // this vector.
        Features tlv.RecordT[tlv.TlvType2, RawFeatureVector]

        // ShortChannelID is the unique description of the funding transaction,
        // or where exactly it's located within the target blockchain.
        ShortChannelID tlv.RecordT[tlv.TlvType4, ShortChannelID]

        // Capacity is the number of satoshis of the capacity of this channel.
        // It must be less than or equal to the value of the on-chain funding
        // output.
        Capacity tlv.RecordT[tlv.TlvType6, uint64]

        // NodeID1 is the numerically-lesser public key ID of one of the channel
        // operators.
        NodeID1 tlv.RecordT[tlv.TlvType8, [33]byte]

        // NodeID2 is the numerically-greater public key ID of one of the
        // channel operators.
        NodeID2 tlv.RecordT[tlv.TlvType10, [33]byte]

        // BitcoinKey1 is the public key of the key used by Node1 in the
        // construction of the on-chain funding transaction. This is an optional
        // field and only needs to be set if the 4-of-4 MuSig construction was
        // used in the creation of the message signature.
        BitcoinKey1 tlv.OptionalRecordT[tlv.TlvType12, [33]byte]

        // BitcoinKey2 is the public key of the key used by Node2 in the
        // construction of the on-chain funding transaction. This is an optional
        // field and only needs to be set if the 4-of-4 MuSig construction was
        // used in the creation of the message signature.
        BitcoinKey2 tlv.OptionalRecordT[tlv.TlvType14, [33]byte]

        // MerkleRootHash is the hash used to create the optional tweak in the
        // funding output. If this is not set but the bitcoin keys are, then
        // the funding output is a pure 2-of-2 MuSig aggregate public key.
        MerkleRootHash tlv.OptionalRecordT[tlv.TlvType16, [32]byte]

        // Signature is a Schnorr signature over serialised signed-range TLV
        // stream of the message.
        Signature tlv.RecordT[tlv.TlvType160, Sig]

        // Any extra fields in the signed range that we do not yet know about,
        // but we need to keep them for signature validation and to produce a
        // valid message.
        ExtraSignedFields
}

// Encode serializes the target AnnounceSignatures1 into the passed io.Writer
// observing the protocol version specified.
//
// This is part of the lnwire.Message interface.
func (c *ChannelAnnouncement2) Encode(w *bytes.Buffer, _ uint32) error {
        return EncodePureTLVMessage(c, w)
}

// AllRecords returns all the TLV records for the message. This will include all
// the records we know about along with any that we don't know about but that
// fall in the signed TLV range.
//
// NOTE: this is part of the PureTLVMessage interface.
func (c *ChannelAnnouncement2) AllRecords() []tlv.Record {
        recordProducers := append(
                c.allNonSignatureRecordProducers(), &c.Signature,
        )

        return ProduceRecordsSorted(recordProducers...)
}

func (c *ChannelAnnouncement2) allNonSignatureRecordProducers() []tlv.RecordProducer {
        // The chain-hash record is only included if it is _not_ equal to the
        // bitcoin mainnet genisis block hash.
        var recordProducers []tlv.RecordProducer
        if !c.ChainHash.Val.IsEqual(chaincfg.MainNetParams.GenesisHash) {
                hash := tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()
                hash.Val = c.ChainHash.Val

                recordProducers = append(recordProducers, &hash)
        }

        recordProducers = append(recordProducers,
                &c.Features, &c.ShortChannelID, &c.Capacity, &c.NodeID1,
                &c.NodeID2,
        )

        c.BitcoinKey1.WhenSome(func(key tlv.RecordT[tlv.TlvType12, [33]byte]) {
                recordProducers = append(recordProducers, &key)
        })

        c.BitcoinKey2.WhenSome(func(key tlv.RecordT[tlv.TlvType14, [33]byte]) {
                recordProducers = append(recordProducers, &key)
        })

        c.MerkleRootHash.WhenSome(
                func(hash tlv.RecordT[tlv.TlvType16, [32]byte]) {
                        recordProducers = append(recordProducers, &hash)
                },
        )

        recordProducers = append(recordProducers, RecordsAsProducers(
                tlv.MapToRecords(c.ExtraSignedFields),
        )...)

        return recordProducers
}

// Decode deserializes a serialized AnnounceSignatures1 stored in the passed
// io.Reader observing the specified protocol version.
//
// This is part of the lnwire.Message interface.
func (c *ChannelAnnouncement2) Decode(r io.Reader, _ uint32) error {
        var (
                chainHash      = tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()
                btcKey1        = tlv.ZeroRecordT[tlv.TlvType12, [33]byte]()
                btcKey2        = tlv.ZeroRecordT[tlv.TlvType14, [33]byte]()
                merkleRootHash = tlv.ZeroRecordT[tlv.TlvType16, [32]byte]()
        )
        stream, err := tlv.NewStream(ProduceRecordsSorted(
                &chainHash,
                &c.Features,
                &c.ShortChannelID,
                &c.Capacity,
                &c.NodeID1,
                &c.NodeID2,
                &btcKey1,
                &btcKey2,
                &merkleRootHash,
                &c.Signature,
        )...)
        if err != nil {
                return err
        }
        c.Signature.Val.ForceSchnorr()

        typeMap, err := stream.DecodeWithParsedTypesP2P(r)
        if err != nil {
                return err
        }

        // By default, the chain-hash is the bitcoin mainnet genesis block hash.
        c.ChainHash.Val = *chaincfg.MainNetParams.GenesisHash
        if _, ok := typeMap[c.ChainHash.TlvType()]; ok {
                c.ChainHash.Val = chainHash.Val
        }

        if _, ok := typeMap[c.BitcoinKey1.TlvType()]; ok {
                c.BitcoinKey1 = tlv.SomeRecordT(btcKey1)
        }

        if _, ok := typeMap[c.BitcoinKey2.TlvType()]; ok {
                c.BitcoinKey2 = tlv.SomeRecordT(btcKey2)
        }

        if _, ok := typeMap[c.MerkleRootHash.TlvType()]; ok {
                c.MerkleRootHash = tlv.SomeRecordT(merkleRootHash)
        }

        c.ExtraSignedFields = ExtraSignedFieldsFromTypeMap(typeMap)

        return nil
}

// DecodeNonSigTLVRecords decodes only the TLV section of the message.
func (c *ChannelAnnouncement2) DecodeNonSigTLVRecords(r io.Reader) error {
        var (
                chainHash      = tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()
                btcKey1        = tlv.ZeroRecordT[tlv.TlvType12, [33]byte]()
                btcKey2        = tlv.ZeroRecordT[tlv.TlvType14, [33]byte]()
                merkleRootHash = tlv.ZeroRecordT[tlv.TlvType16, [32]byte]()
        )
        stream, err := tlv.NewStream(ProduceRecordsSorted(
                &chainHash,
                &c.Features,
                &c.ShortChannelID,
                &c.Capacity,
                &c.NodeID1,
                &c.NodeID2,
                &btcKey1,
                &btcKey2,
                &merkleRootHash,
        )...)
        if err != nil {
                return err
        }

        typeMap, err := stream.DecodeWithParsedTypesP2P(r)
        if err != nil {
                return err
        }

        // By default, the chain-hash is the bitcoin mainnet genesis block hash.
        c.ChainHash.Val = *chaincfg.MainNetParams.GenesisHash
        if _, ok := typeMap[c.ChainHash.TlvType()]; ok {
                c.ChainHash.Val = chainHash.Val
        }

        if _, ok := typeMap[c.BitcoinKey1.TlvType()]; ok {
                c.BitcoinKey1 = tlv.SomeRecordT(btcKey1)
        }

        if _, ok := typeMap[c.BitcoinKey2.TlvType()]; ok {
                c.BitcoinKey2 = tlv.SomeRecordT(btcKey2)
        }

        if _, ok := typeMap[c.MerkleRootHash.TlvType()]; ok {
                c.MerkleRootHash = tlv.SomeRecordT(merkleRootHash)
        }

        c.ExtraSignedFields = ExtraSignedFieldsFromTypeMap(typeMap)

        return nil
}

// EncodeAllNonSigFields encodes the entire message to the given writer but
// excludes the signature field.
func (c *ChannelAnnouncement2) EncodeAllNonSigFields(w io.Writer) error {
        return EncodeRecordsTo(
                w, ProduceRecordsSorted(c.allNonSignatureRecordProducers()...),
        )
}

// MsgType returns the integer uniquely identifying this message type on the
// wire.
//
// This is part of the lnwire.Message interface.
func (c *ChannelAnnouncement2) MsgType() MessageType {
        return MsgChannelAnnouncement2
}

// A compile time check to ensure ChannelAnnouncement2 implements the
// lnwire.Message interface.
var _ Message = (*ChannelAnnouncement2)(nil)

// A compile time check to ensure ChannelAnnouncement2 implements the
// lnwire.PureTLVMessage interface.
var _ PureTLVMessage = (*ChannelAnnouncement2)(nil)

// Node1KeyBytes returns the bytes representing the public key of node 1 in the
// channel.
//
// NOTE: This is part of the ChannelAnnouncement interface.
func (c *ChannelAnnouncement2) Node1KeyBytes() [33]byte {
        return c.NodeID1.Val
}

// Node2KeyBytes returns the bytes representing the public key of node 2 in the
// channel.
//
// NOTE: This is part of the ChannelAnnouncement interface.
func (c *ChannelAnnouncement2) Node2KeyBytes() [33]byte {
        return c.NodeID2.Val
}

// GetChainHash returns the hash of the chain which this channel's funding
// transaction is confirmed in.
//
// NOTE: This is part of the ChannelAnnouncement interface.
func (c *ChannelAnnouncement2) GetChainHash() chainhash.Hash {
        return c.ChainHash.Val
}

// SCID returns the short channel ID of the channel.
//
// NOTE: This is part of the ChannelAnnouncement interface.
func (c *ChannelAnnouncement2) SCID() ShortChannelID {
        return c.ShortChannelID.Val
}

// A compile-time check to ensure that ChannelAnnouncement2 implements the
// ChannelAnnouncement interface.
var _ ChannelAnnouncement = (*ChannelAnnouncement2)(nil)

1	package lnwire
2
3	import (
4	"bytes"
5	"io"
6
7	"github.com/btcsuite/btcd/chaincfg"
8	"github.com/btcsuite/btcd/chaincfg/chainhash"
9	"github.com/lightningnetwork/lnd/tlv"
10	)
11
12	// ChannelAnnouncement2 message is used to announce the existence of a taproot
13	// channel between two peers in the network.
14	type ChannelAnnouncement2 struct {
15	// ChainHash denotes the target chain that this channel was opened
16	// within. This value should be the genesis hash of the target chain.
17	ChainHash tlv.RecordT[tlv.TlvType0, chainhash.Hash]
18
19	// Features is the feature vector that encodes the features supported
20	// by the target node. This field can be used to signal the type of the
21	// channel, or modifications to the fields that would normally follow
22	// this vector.
23	Features tlv.RecordT[tlv.TlvType2, RawFeatureVector]
24
25	// ShortChannelID is the unique description of the funding transaction,
26	// or where exactly it's located within the target blockchain.
27	ShortChannelID tlv.RecordT[tlv.TlvType4, ShortChannelID]
28
29	// Capacity is the number of satoshis of the capacity of this channel.
30	// It must be less than or equal to the value of the on-chain funding
31	// output.
32	Capacity tlv.RecordT[tlv.TlvType6, uint64]
33
34	// NodeID1 is the numerically-lesser public key ID of one of the channel
35	// operators.
36	NodeID1 tlv.RecordT[tlv.TlvType8, [33]byte]
37
38	// NodeID2 is the numerically-greater public key ID of one of the
39	// channel operators.
40	NodeID2 tlv.RecordT[tlv.TlvType10, [33]byte]
41
42	// BitcoinKey1 is the public key of the key used by Node1 in the
43	// construction of the on-chain funding transaction. This is an optional
44	// field and only needs to be set if the 4-of-4 MuSig construction was
45	// used in the creation of the message signature.
46	BitcoinKey1 tlv.OptionalRecordT[tlv.TlvType12, [33]byte]
47
48	// BitcoinKey2 is the public key of the key used by Node2 in the
49	// construction of the on-chain funding transaction. This is an optional
50	// field and only needs to be set if the 4-of-4 MuSig construction was
51	// used in the creation of the message signature.
52	BitcoinKey2 tlv.OptionalRecordT[tlv.TlvType14, [33]byte]
53
54	// MerkleRootHash is the hash used to create the optional tweak in the
55	// funding output. If this is not set but the bitcoin keys are, then
56	// the funding output is a pure 2-of-2 MuSig aggregate public key.
57	MerkleRootHash tlv.OptionalRecordT[tlv.TlvType16, [32]byte]
58
59	// Signature is a Schnorr signature over serialised signed-range TLV
60	// stream of the message.
61	Signature tlv.RecordT[tlv.TlvType160, Sig]
62
63	// Any extra fields in the signed range that we do not yet know about,
64	// but we need to keep them for signature validation and to produce a
65	// valid message.
66	ExtraSignedFields
67	}
68
69	// Encode serializes the target AnnounceSignatures1 into the passed io.Writer
70	// observing the protocol version specified.
71	//
72	// This is part of the lnwire.Message interface.
73	func (c ChannelAnnouncement2) Encode(w bytes.Buffer, _ uint32) error {	100✔
74	return EncodePureTLVMessage(c, w)	100✔
75	}	100✔
76
77	// AllRecords returns all the TLV records for the message. This will include all
78	// the records we know about along with any that we don't know about but that
79	// fall in the signed TLV range.
80	//
81	// NOTE: this is part of the PureTLVMessage interface.
82	func (c *ChannelAnnouncement2) AllRecords() []tlv.Record {	106✔
83	recordProducers := append(	106✔
84	c.allNonSignatureRecordProducers(), &c.Signature,	106✔
85	)	106✔
86		106✔
87	return ProduceRecordsSorted(recordProducers...)	106✔
88	}	106✔
89
90	func (c *ChannelAnnouncement2) allNonSignatureRecordProducers() []tlv.RecordProducer {	106✔
91	// The chain-hash record is only included if it is _not_ equal to the	106✔
92	// bitcoin mainnet genisis block hash.	106✔
93	var recordProducers []tlv.RecordProducer	106✔
94	if !c.ChainHash.Val.IsEqual(chaincfg.MainNetParams.GenesisHash) {	158✔
95	hash := tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()	52✔
96	hash.Val = c.ChainHash.Val	52✔
97		52✔
98	recordProducers = append(recordProducers, &hash)	52✔
99	}	52✔
100
101	recordProducers = append(recordProducers,	106✔
102	&c.Features, &c.ShortChannelID, &c.Capacity, &c.NodeID1,	106✔
103	&c.NodeID2,	106✔
104	)	106✔
105		106✔
106	c.BitcoinKey1.WhenSome(func(key tlv.RecordT[tlv.TlvType12, [33]byte]) {	154✔
107	recordProducers = append(recordProducers, &key)	48✔
108	})	48✔
109
110	c.BitcoinKey2.WhenSome(func(key tlv.RecordT[tlv.TlvType14, [33]byte]) {	154✔
111	recordProducers = append(recordProducers, &key)	48✔
112	})	48✔
113
114	c.MerkleRootHash.WhenSome(	106✔
115	func(hash tlv.RecordT[tlv.TlvType16, [32]byte]) {	127✔
116	recordProducers = append(recordProducers, &hash)	21✔
117	},	21✔
118	)
119
120	recordProducers = append(recordProducers, RecordsAsProducers(	106✔
121	tlv.MapToRecords(c.ExtraSignedFields),	106✔
122	)...)	106✔
123		106✔
124	return recordProducers	106✔
125	}
126
127	// Decode deserializes a serialized AnnounceSignatures1 stored in the passed
128	// io.Reader observing the specified protocol version.
129	//
130	// This is part of the lnwire.Message interface.
131	func (c *ChannelAnnouncement2) Decode(r io.Reader, _ uint32) error {	100✔
132	var (	100✔
133	chainHash = tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()	100✔
134	btcKey1 = tlv.ZeroRecordT[tlv.TlvType12, [33]byte]()	100✔
135	btcKey2 = tlv.ZeroRecordT[tlv.TlvType14, [33]byte]()	100✔
136	merkleRootHash = tlv.ZeroRecordT[tlv.TlvType16, [32]byte]()	100✔
137	)	100✔
138	stream, err := tlv.NewStream(ProduceRecordsSorted(	100✔
139	&chainHash,	100✔
140	&c.Features,	100✔
141	&c.ShortChannelID,	100✔
142	&c.Capacity,	100✔
143	&c.NodeID1,	100✔
144	&c.NodeID2,	100✔
145	&btcKey1,	100✔
146	&btcKey2,	100✔
147	&merkleRootHash,	100✔
148	&c.Signature,	100✔
149	)...)	100✔
150	if err != nil {	100✔
NEW 151	return err	×
NEW 152	}	×
153	c.Signature.Val.ForceSchnorr()	100✔
154		100✔
155	typeMap, err := stream.DecodeWithParsedTypesP2P(r)	100✔
156	if err != nil {	100✔
157	return err	×
158	}	×
159
160	// By default, the chain-hash is the bitcoin mainnet genesis block hash.
161	c.ChainHash.Val = *chaincfg.MainNetParams.GenesisHash	100✔
162	if _, ok := typeMap[c.ChainHash.TlvType()]; ok {	152✔
163	c.ChainHash.Val = chainHash.Val	52✔
164	}	52✔
165
166	if _, ok := typeMap[c.BitcoinKey1.TlvType()]; ok {	144✔
167	c.BitcoinKey1 = tlv.SomeRecordT(btcKey1)	44✔
168	}	44✔
169
170	if _, ok := typeMap[c.BitcoinKey2.TlvType()]; ok {	144✔
171	c.BitcoinKey2 = tlv.SomeRecordT(btcKey2)	44✔
172	}	44✔
173
174	if _, ok := typeMap[c.MerkleRootHash.TlvType()]; ok {	121✔
175	c.MerkleRootHash = tlv.SomeRecordT(merkleRootHash)	21✔
176	}	21✔
177
178	c.ExtraSignedFields = ExtraSignedFieldsFromTypeMap(typeMap)	100✔
179		100✔
180	return nil	100✔
181	}
182
183	// DecodeNonSigTLVRecords decodes only the TLV section of the message.
NEW 184	func (c *ChannelAnnouncement2) DecodeNonSigTLVRecords(r io.Reader) error {	×
NEW 185	var (	×
NEW 186	chainHash = tlv.ZeroRecordT[tlv.TlvType0, [32]byte]()	×
NEW 187	btcKey1 = tlv.ZeroRecordT[tlv.TlvType12, [33]byte]()	×
NEW 188	btcKey2 = tlv.ZeroRecordT[tlv.TlvType14, [33]byte]()	×
NEW 189	merkleRootHash = tlv.ZeroRecordT[tlv.TlvType16, [32]byte]()	×
NEW 190	)	×
NEW 191	stream, err := tlv.NewStream(ProduceRecordsSorted(	×
NEW 192	&chainHash,	×
NEW 193	&c.Features,	×
NEW 194	&c.ShortChannelID,	×
NEW 195	&c.Capacity,	×
NEW 196	&c.NodeID1,	×
NEW 197	&c.NodeID2,	×
NEW 198	&btcKey1,	×
NEW 199	&btcKey2,	×
NEW 200	&merkleRootHash,	×
NEW 201	)...)	×
202	if err != nil {	×
203	return err	×
204	}	×
205
NEW 206	typeMap, err := stream.DecodeWithParsedTypesP2P(r)	×
207	if err != nil {	×
208	return err	×
209	}	×
210
211	// By default, the chain-hash is the bitcoin mainnet genesis block hash.
NEW 212	c.ChainHash.Val = *chaincfg.MainNetParams.GenesisHash	×
NEW 213	if _, ok := typeMap[c.ChainHash.TlvType()]; ok {	×
NEW 214	c.ChainHash.Val = chainHash.Val	×
NEW 215	}	×
216
NEW 217	if _, ok := typeMap[c.BitcoinKey1.TlvType()]; ok {	×
NEW 218	c.BitcoinKey1 = tlv.SomeRecordT(btcKey1)	×
NEW 219	}	×
220
NEW 221	if _, ok := typeMap[c.BitcoinKey2.TlvType()]; ok {	×
NEW 222	c.BitcoinKey2 = tlv.SomeRecordT(btcKey2)	×
UNCOV 223	}	×
224
NEW 225	if _, ok := typeMap[c.MerkleRootHash.TlvType()]; ok {	×
NEW 226	c.MerkleRootHash = tlv.SomeRecordT(merkleRootHash)	×
NEW 227	}	×
228
NEW 229	c.ExtraSignedFields = ExtraSignedFieldsFromTypeMap(typeMap)	×
UNCOV 230		×
NEW 231	return nil	×
232	}
233
234	// EncodeAllNonSigFields encodes the entire message to the given writer but
235	// excludes the signature field.
NEW 236	func (c *ChannelAnnouncement2) EncodeAllNonSigFields(w io.Writer) error {	×
NEW 237	return EncodeRecordsTo(	×
NEW 238	w, ProduceRecordsSorted(c.allNonSignatureRecordProducers()...),	×
UNCOV 239	)	×
UNCOV 240	}	×
241
242	// MsgType returns the integer uniquely identifying this message type on the
243	// wire.
244	//
245	// This is part of the lnwire.Message interface.
246	func (c *ChannelAnnouncement2) MsgType() MessageType {	100✔
247	return MsgChannelAnnouncement2	100✔
248	}	100✔
249
250	// A compile time check to ensure ChannelAnnouncement2 implements the
251	// lnwire.Message interface.
252	var _ Message = (*ChannelAnnouncement2)(nil)
253
254	// A compile time check to ensure ChannelAnnouncement2 implements the
255	// lnwire.PureTLVMessage interface.
256	var _ PureTLVMessage = (*ChannelAnnouncement2)(nil)
257
258	// Node1KeyBytes returns the bytes representing the public key of node 1 in the
259	// channel.
260	//
261	// NOTE: This is part of the ChannelAnnouncement interface.
262	func (c *ChannelAnnouncement2) Node1KeyBytes() [33]byte {	×
263	return c.NodeID1.Val	×
264	}	×
265
266	// Node2KeyBytes returns the bytes representing the public key of node 2 in the
267	// channel.
268	//
269	// NOTE: This is part of the ChannelAnnouncement interface.
270	func (c *ChannelAnnouncement2) Node2KeyBytes() [33]byte {	×
271	return c.NodeID2.Val	×
272	}	×
273
274	// GetChainHash returns the hash of the chain which this channel's funding
275	// transaction is confirmed in.
276	//
277	// NOTE: This is part of the ChannelAnnouncement interface.
278	func (c *ChannelAnnouncement2) GetChainHash() chainhash.Hash {	×
279	return c.ChainHash.Val	×
280	}	×
281
282	// SCID returns the short channel ID of the channel.
283	//
284	// NOTE: This is part of the ChannelAnnouncement interface.
285	func (c *ChannelAnnouncement2) SCID() ShortChannelID {	×
286	return c.ShortChannelID.Val	×
287	}	×
288
289	// A compile-time check to ensure that ChannelAnnouncement2 implements the
290	// ChannelAnnouncement interface.
291	var _ ChannelAnnouncement = (*ChannelAnnouncement2)(nil)

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