11880886288

Committed 17 Nov 2024 05:35PM UTC coverage: 57.94% (-1.0%) from 58.935%

Build # 11880886288

Build Type

Pull #9274

github

Committed by

ziggie1984

Commit Message

docs: add release-notes

Pull Request Pull Request #9274: Decrease outgoing htlc budget

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94.56

/lnwire/message.go

// Copyright (c) 2013-2017 The btcsuite developers
// Copyright (c) 2015-2016 The Decred developers
// code derived from https://github .com/btcsuite/btcd/blob/master/wire/message.go
// Copyright (C) 2015-2022 The Lightning Network Developers

package lnwire

import (
        "bytes"
        "encoding/binary"
        "fmt"
        "io"
)

// MessageType is the unique 2 byte big-endian integer that indicates the type
// of message on the wire. All messages have a very simple header which
// consists simply of 2-byte message type. We omit a length field, and checksum
// as the Lightning Protocol is intended to be encapsulated within a
// confidential+authenticated cryptographic messaging protocol.
type MessageType uint16

// The currently defined message types within this current version of the
// Lightning protocol.
const (
        MsgWarning                 MessageType = 1
        MsgStfu                                = 2
        MsgInit                                = 16
        MsgError                               = 17
        MsgPing                                = 18
        MsgPong                                = 19
        MsgOpenChannel                         = 32
        MsgAcceptChannel                       = 33
        MsgFundingCreated                      = 34
        MsgFundingSigned                       = 35
        MsgChannelReady                        = 36
        MsgShutdown                            = 38
        MsgClosingSigned                       = 39
        MsgClosingComplete                     = 40
        MsgClosingSig                          = 41
        MsgDynPropose                          = 111
        MsgDynAck                              = 113
        MsgDynReject                           = 115
        MsgUpdateAddHTLC                       = 128
        MsgUpdateFulfillHTLC                   = 130
        MsgUpdateFailHTLC                      = 131
        MsgCommitSig                           = 132
        MsgRevokeAndAck                        = 133
        MsgUpdateFee                           = 134
        MsgUpdateFailMalformedHTLC             = 135
        MsgChannelReestablish                  = 136
        MsgChannelAnnouncement                 = 256
        MsgNodeAnnouncement                    = 257
        MsgChannelUpdate                       = 258
        MsgAnnounceSignatures                  = 259
        MsgAnnounceSignatures2                 = 260
        MsgQueryShortChanIDs                   = 261
        MsgReplyShortChanIDsEnd                = 262
        MsgQueryChannelRange                   = 263
        MsgReplyChannelRange                   = 264
        MsgGossipTimestampRange                = 265
        MsgChannelAnnouncement2                = 267
        MsgChannelUpdate2                      = 271
        MsgKickoffSig                          = 777
)

// ErrorEncodeMessage is used when failed to encode the message payload.
func ErrorEncodeMessage(err error) error {
        return fmt.Errorf("failed to encode message to buffer, got %w", err)
}

// ErrorWriteMessageType is used when failed to write the message type.
func ErrorWriteMessageType(err error) error {
        return fmt.Errorf("failed to write message type, got %w", err)
}

// ErrorPayloadTooLarge is used when the payload size exceeds the
// MaxMsgBody.
func ErrorPayloadTooLarge(size int) error {
        return fmt.Errorf(
                "message payload is too large - encoded %d bytes, "+
                        "but maximum message payload is %d bytes",
                size, MaxMsgBody,
        )
}

// String return the string representation of message type.
func (t MessageType) String() string {
        switch t {
        case MsgWarning:
                return "Warning"
        case MsgStfu:
                return "Stfu"
        case MsgInit:
                return "Init"
        case MsgOpenChannel:
                return "MsgOpenChannel"
        case MsgAcceptChannel:
                return "MsgAcceptChannel"
        case MsgFundingCreated:
                return "MsgFundingCreated"
        case MsgFundingSigned:
                return "MsgFundingSigned"
        case MsgChannelReady:
                return "ChannelReady"
        case MsgShutdown:
                return "Shutdown"
        case MsgClosingSigned:
                return "ClosingSigned"
        case MsgDynPropose:
                return "DynPropose"
        case MsgDynAck:
                return "DynAck"
        case MsgDynReject:
                return "DynReject"
        case MsgKickoffSig:
                return "KickoffSig"
        case MsgUpdateAddHTLC:
                return "UpdateAddHTLC"
        case MsgUpdateFailHTLC:
                return "UpdateFailHTLC"
        case MsgUpdateFulfillHTLC:
                return "UpdateFulfillHTLC"
        case MsgCommitSig:
                return "CommitSig"
        case MsgRevokeAndAck:
                return "RevokeAndAck"
        case MsgUpdateFailMalformedHTLC:
                return "UpdateFailMalformedHTLC"
        case MsgChannelReestablish:
                return "ChannelReestablish"
        case MsgError:
                return "Error"
        case MsgChannelAnnouncement:
                return "ChannelAnnouncement"
        case MsgChannelUpdate:
                return "ChannelUpdate"
        case MsgNodeAnnouncement:
                return "NodeAnnouncement"
        case MsgPing:
                return "Ping"
        case MsgAnnounceSignatures:
                return "AnnounceSignatures"
        case MsgPong:
                return "Pong"
        case MsgUpdateFee:
                return "UpdateFee"
        case MsgQueryShortChanIDs:
                return "QueryShortChanIDs"
        case MsgReplyShortChanIDsEnd:
                return "ReplyShortChanIDsEnd"
        case MsgQueryChannelRange:
                return "QueryChannelRange"
        case MsgReplyChannelRange:
                return "ReplyChannelRange"
        case MsgGossipTimestampRange:
                return "GossipTimestampRange"
        case MsgClosingComplete:
                return "ClosingComplete"
        case MsgClosingSig:
                return "ClosingSig"
        case MsgAnnounceSignatures2:
                return "MsgAnnounceSignatures2"
        case MsgChannelAnnouncement2:
                return "ChannelAnnouncement2"
        case MsgChannelUpdate2:
                return "ChannelUpdate2"
        default:
                return "<unknown>"
        }
}

// UnknownMessage is an implementation of the error interface that allows the
// creation of an error in response to an unknown message.
type UnknownMessage struct {
        messageType MessageType
}

// Error returns a human readable string describing the error.
//
// This is part of the error interface.
func (u *UnknownMessage) Error() string {
        return fmt.Sprintf("unable to parse message of unknown type: %v",
                u.messageType)
}

// Serializable is an interface which defines a lightning wire serializable
// object.
type Serializable interface {
        // Decode reads the bytes stream and converts it to the object.
        Decode(io.Reader, uint32) error

        // Encode converts object to the bytes stream and write it into the
        // write buffer.
        Encode(*bytes.Buffer, uint32) error
}

// Message is an interface that defines a lightning wire protocol message. The
// interface is general in order to allow implementing types full control over
// the representation of its data.
type Message interface {
        Serializable
        MsgType() MessageType
}

// LinkUpdater is an interface implemented by most messages in BOLT 2 that are
// allowed to update the channel state.
type LinkUpdater interface {
        // All LinkUpdater messages are messages and so we embed the interface
        // so that we can treat it as a message if all we know about it is that
        // it is a LinkUpdater message.
        Message

        // TargetChanID returns the channel id of the link for which this
        // message is intended.
        TargetChanID() ChannelID
}

// makeEmptyMessage creates a new empty message of the proper concrete type
// based on the passed message type.
func makeEmptyMessage(msgType MessageType) (Message, error) {
        var msg Message

        switch msgType {
        case MsgWarning:
                msg = &Warning{}
        case MsgStfu:
                msg = &Stfu{}
        case MsgInit:
                msg = &Init{}
        case MsgOpenChannel:
                msg = &OpenChannel{}
        case MsgAcceptChannel:
                msg = &AcceptChannel{}
        case MsgFundingCreated:
                msg = &FundingCreated{}
        case MsgFundingSigned:
                msg = &FundingSigned{}
        case MsgChannelReady:
                msg = &ChannelReady{}
        case MsgShutdown:
                msg = &Shutdown{}
        case MsgClosingSigned:
                msg = &ClosingSigned{}
        case MsgDynPropose:
                msg = &DynPropose{}
        case MsgDynAck:
                msg = &DynAck{}
        case MsgDynReject:
                msg = &DynReject{}
        case MsgKickoffSig:
                msg = &KickoffSig{}
        case MsgUpdateAddHTLC:
                msg = &UpdateAddHTLC{}
        case MsgUpdateFailHTLC:
                msg = &UpdateFailHTLC{}
        case MsgUpdateFulfillHTLC:
                msg = &UpdateFulfillHTLC{}
        case MsgCommitSig:
                msg = &CommitSig{}
        case MsgRevokeAndAck:
                msg = &RevokeAndAck{}
        case MsgUpdateFee:
                msg = &UpdateFee{}
        case MsgUpdateFailMalformedHTLC:
                msg = &UpdateFailMalformedHTLC{}
        case MsgChannelReestablish:
                msg = &ChannelReestablish{}
        case MsgError:
                msg = &Error{}
        case MsgChannelAnnouncement:
                msg = &ChannelAnnouncement1{}
        case MsgChannelUpdate:
                msg = &ChannelUpdate1{}
        case MsgNodeAnnouncement:
                msg = &NodeAnnouncement{}
        case MsgPing:
                msg = &Ping{}
        case MsgAnnounceSignatures:
                msg = &AnnounceSignatures1{}
        case MsgPong:
                msg = &Pong{}
        case MsgQueryShortChanIDs:
                msg = &QueryShortChanIDs{}
        case MsgReplyShortChanIDsEnd:
                msg = &ReplyShortChanIDsEnd{}
        case MsgQueryChannelRange:
                msg = &QueryChannelRange{}
        case MsgReplyChannelRange:
                msg = &ReplyChannelRange{}
        case MsgGossipTimestampRange:
                msg = &GossipTimestampRange{}
        case MsgClosingComplete:
                msg = &ClosingComplete{}
        case MsgClosingSig:
                msg = &ClosingSig{}
        case MsgAnnounceSignatures2:
                msg = &AnnounceSignatures2{}
        case MsgChannelAnnouncement2:
                msg = &ChannelAnnouncement2{}
        case MsgChannelUpdate2:
                msg = &ChannelUpdate2{}
        default:
                // If the message is not within our custom range and has not
                // specifically been overridden, return an unknown message.
                //
                // Note that we do not allow custom message overrides to replace
                // known message types, only protocol messages that are not yet
                // known to lnd.
                if msgType < CustomTypeStart && !IsCustomOverride(msgType) {
                        return nil, &UnknownMessage{msgType}
                }

                msg = &Custom{
                        Type: msgType,
                }
        }

        return msg, nil
}

// WriteMessage writes a lightning Message to a buffer including the necessary
// header information and returns the number of bytes written. If any error is
// encountered, the buffer passed will be reset to its original state since we
// don't want any broken bytes left. In other words, no bytes will be written
// if there's an error. Either all or none of the message bytes will be written
// to the buffer.
//
// NOTE: this method is not concurrent safe.
func WriteMessage(buf *bytes.Buffer, msg Message, pver uint32) (int, error) {
        // Record the size of the bytes already written in buffer.
        oldByteSize := buf.Len()

        // cleanBrokenBytes is a helper closure that helps reset the buffer to
        // its original state. It truncates all the bytes written in current
        // scope.
        var cleanBrokenBytes = func(b *bytes.Buffer) int {
                b.Truncate(oldByteSize)
                return 0
        }

        // Write the message type.
        var mType [2]byte
        binary.BigEndian.PutUint16(mType[:], uint16(msg.MsgType()))
        msgTypeBytes, err := buf.Write(mType[:])
        if err != nil {
                return cleanBrokenBytes(buf), ErrorWriteMessageType(err)
        }

        // Use the write buffer to encode our message.
        if err := msg.Encode(buf, pver); err != nil {
                return cleanBrokenBytes(buf), ErrorEncodeMessage(err)
        }

        // Enforce maximum overall message payload. The write buffer now has
        // the size of len(originalBytes) + len(payload) + len(type). We want
        // to enforce the payload here, so we subtract it by the length of the
        // type and old bytes.
        lenp := buf.Len() - oldByteSize - msgTypeBytes
        if lenp > MaxMsgBody {
                return cleanBrokenBytes(buf), ErrorPayloadTooLarge(lenp)
        }

        return buf.Len() - oldByteSize, nil
}

// ReadMessage reads, validates, and parses the next Lightning message from r
// for the provided protocol version.
func ReadMessage(r io.Reader, pver uint32) (Message, error) {
        // First, we'll read out the first two bytes of the message so we can
        // create the proper empty message.
        var mType [2]byte
        if _, err := io.ReadFull(r, mType[:]); err != nil {
                return nil, err
        }

        msgType := MessageType(binary.BigEndian.Uint16(mType[:]))

        // Now that we know the target message type, we can create the proper
        // empty message type and decode the message into it.
        msg, err := makeEmptyMessage(msgType)
        if err != nil {
                return nil, err
        }
        if err := msg.Decode(r, pver); err != nil {
                return nil, err
        }

        return msg, nil
}

1	// Copyright (c) 2013-2017 The btcsuite developers
2	// Copyright (c) 2015-2016 The Decred developers
3	// code derived from https://github .com/btcsuite/btcd/blob/master/wire/message.go
4	// Copyright (C) 2015-2022 The Lightning Network Developers
5
6	package lnwire
7
8	import (
9	"bytes"
10	"encoding/binary"
11	"fmt"
12	"io"
13	)
14
15	// MessageType is the unique 2 byte big-endian integer that indicates the type
16	// of message on the wire. All messages have a very simple header which
17	// consists simply of 2-byte message type. We omit a length field, and checksum
18	// as the Lightning Protocol is intended to be encapsulated within a
19	// confidential+authenticated cryptographic messaging protocol.
20	type MessageType uint16
21
22	// The currently defined message types within this current version of the
23	// Lightning protocol.
24	const (
25	MsgWarning MessageType = 1
26	MsgStfu = 2
27	MsgInit = 16
28	MsgError = 17
29	MsgPing = 18
30	MsgPong = 19
31	MsgOpenChannel = 32
32	MsgAcceptChannel = 33
33	MsgFundingCreated = 34
34	MsgFundingSigned = 35
35	MsgChannelReady = 36
36	MsgShutdown = 38
37	MsgClosingSigned = 39
38	MsgClosingComplete = 40
39	MsgClosingSig = 41
40	MsgDynPropose = 111
41	MsgDynAck = 113
42	MsgDynReject = 115
43	MsgUpdateAddHTLC = 128
44	MsgUpdateFulfillHTLC = 130
45	MsgUpdateFailHTLC = 131
46	MsgCommitSig = 132
47	MsgRevokeAndAck = 133
48	MsgUpdateFee = 134
49	MsgUpdateFailMalformedHTLC = 135
50	MsgChannelReestablish = 136
51	MsgChannelAnnouncement = 256
52	MsgNodeAnnouncement = 257
53	MsgChannelUpdate = 258
54	MsgAnnounceSignatures = 259
55	MsgAnnounceSignatures2 = 260
56	MsgQueryShortChanIDs = 261
57	MsgReplyShortChanIDsEnd = 262
58	MsgQueryChannelRange = 263
59	MsgReplyChannelRange = 264
60	MsgGossipTimestampRange = 265
61	MsgChannelAnnouncement2 = 267
62	MsgChannelUpdate2 = 271
63	MsgKickoffSig = 777
64	)
65
66	// ErrorEncodeMessage is used when failed to encode the message payload.
67	func ErrorEncodeMessage(err error) error {	4✔
68	return fmt.Errorf("failed to encode message to buffer, got %w", err)	4✔
69	}	4✔
70
71	// ErrorWriteMessageType is used when failed to write the message type.
72	func ErrorWriteMessageType(err error) error {	×
73	return fmt.Errorf("failed to write message type, got %w", err)	×
74	}	×
75
76	// ErrorPayloadTooLarge is used when the payload size exceeds the
77	// MaxMsgBody.
78	func ErrorPayloadTooLarge(size int) error {	2✔
79	return fmt.Errorf(	2✔
80	"message payload is too large - encoded %d bytes, "+	2✔
81	"but maximum message payload is %d bytes",	2✔
82	size, MaxMsgBody,	2✔
83	)	2✔
84	}	2✔
85
86	// String return the string representation of message type.
87	func (t MessageType) String() string {	1,072✔
88	switch t {	1,072✔
89	case MsgWarning:	2✔
90	return "Warning"	2✔
91	case MsgStfu:	2✔
92	return "Stfu"	2✔
93	case MsgInit:	12✔
94	return "Init"	12✔
95	case MsgOpenChannel:	2✔
96	return "MsgOpenChannel"	2✔
97	case MsgAcceptChannel:	2✔
98	return "MsgAcceptChannel"	2✔
99	case MsgFundingCreated:	2✔
100	return "MsgFundingCreated"	2✔
101	case MsgFundingSigned:	2✔
102	return "MsgFundingSigned"	2✔
103	case MsgChannelReady:	2✔
104	return "ChannelReady"	2✔
105	case MsgShutdown:	2✔
106	return "Shutdown"	2✔
107	case MsgClosingSigned:	2✔
108	return "ClosingSigned"	2✔
109	case MsgDynPropose:	2✔
110	return "DynPropose"	2✔
111	case MsgDynAck:	2✔
112	return "DynAck"	2✔
113	case MsgDynReject:	2✔
114	return "DynReject"	2✔
115	case MsgKickoffSig:	2✔
116	return "KickoffSig"	2✔
117	case MsgUpdateAddHTLC:	2✔
118	return "UpdateAddHTLC"	2✔
119	case MsgUpdateFailHTLC:	2✔
120	return "UpdateFailHTLC"	2✔
121	case MsgUpdateFulfillHTLC:	2✔
122	return "UpdateFulfillHTLC"	2✔
123	case MsgCommitSig:	2✔
124	return "CommitSig"	2✔
125	case MsgRevokeAndAck:	2✔
126	return "RevokeAndAck"	2✔
127	case MsgUpdateFailMalformedHTLC:	2✔
128	return "UpdateFailMalformedHTLC"	2✔
129	case MsgChannelReestablish:	172✔
130	return "ChannelReestablish"	172✔
131	case MsgError:	3✔
132	return "Error"	3✔
133	case MsgChannelAnnouncement:	486✔
134	return "ChannelAnnouncement"	486✔
135	case MsgChannelUpdate:	196✔
136	return "ChannelUpdate"	196✔
137	case MsgNodeAnnouncement:	72✔
138	return "NodeAnnouncement"	72✔
139	case MsgPing:	3✔
140	return "Ping"	3✔
141	case MsgAnnounceSignatures:	64✔
142	return "AnnounceSignatures"	64✔
143	case MsgPong:	2✔
144	return "Pong"	2✔
145	case MsgUpdateFee:	2✔
146	return "UpdateFee"	2✔
147	case MsgQueryShortChanIDs:	2✔
148	return "QueryShortChanIDs"	2✔
149	case MsgReplyShortChanIDsEnd:	2✔
150	return "ReplyShortChanIDsEnd"	2✔
151	case MsgQueryChannelRange:	2✔
152	return "QueryChannelRange"	2✔
153	case MsgReplyChannelRange:	2✔
154	return "ReplyChannelRange"	2✔
155	case MsgGossipTimestampRange:	2✔
156	return "GossipTimestampRange"	2✔
157	case MsgClosingComplete:	2✔
158	return "ClosingComplete"	2✔
159	case MsgClosingSig:	2✔
160	return "ClosingSig"	2✔
161	case MsgAnnounceSignatures2:	2✔
162	return "MsgAnnounceSignatures2"	2✔
163	case MsgChannelAnnouncement2:	2✔
164	return "ChannelAnnouncement2"	2✔
165	case MsgChannelUpdate2:	2✔
166	return "ChannelUpdate2"	2✔
167	default:	2✔
168	return "<unknown>"	2✔
169	}
170	}
171
172	// UnknownMessage is an implementation of the error interface that allows the
173	// creation of an error in response to an unknown message.
174	type UnknownMessage struct {
175	messageType MessageType
176	}
177
178	// Error returns a human readable string describing the error.
179	//
180	// This is part of the error interface.
UNCOV 181	func (u *UnknownMessage) Error() string {	×
UNCOV 182	return fmt.Sprintf("unable to parse message of unknown type: %v",	×
UNCOV 183	u.messageType)	×
UNCOV 184	}	×
185
186	// Serializable is an interface which defines a lightning wire serializable
187	// object.
188	type Serializable interface {
189	// Decode reads the bytes stream and converts it to the object.
190	Decode(io.Reader, uint32) error
191
192	// Encode converts object to the bytes stream and write it into the
193	// write buffer.
194	Encode(*bytes.Buffer, uint32) error
195	}
196
197	// Message is an interface that defines a lightning wire protocol message. The
198	// interface is general in order to allow implementing types full control over
199	// the representation of its data.
200	type Message interface {
201	Serializable
202	MsgType() MessageType
203	}
204
205	// LinkUpdater is an interface implemented by most messages in BOLT 2 that are
206	// allowed to update the channel state.
207	type LinkUpdater interface {
208	// All LinkUpdater messages are messages and so we embed the interface
209	// so that we can treat it as a message if all we know about it is that
210	// it is a LinkUpdater message.
211	Message
212
213	// TargetChanID returns the channel id of the link for which this
214	// message is intended.
215	TargetChanID() ChannelID
216	}
217
218	// makeEmptyMessage creates a new empty message of the proper concrete type
219	// based on the passed message type.
220	func makeEmptyMessage(msgType MessageType) (Message, error) {	13,740✔
221	var msg Message	13,740✔
222		13,740✔
223	switch msgType {	13,740✔
224	case MsgWarning:	113✔
225	msg = &Warning{}	113✔
226	case MsgStfu:	100✔
227	msg = &Stfu{}	100✔
228	case MsgInit:	180✔
229	msg = &Init{}	180✔
230	case MsgOpenChannel:	267✔
231	msg = &OpenChannel{}	267✔
232	case MsgAcceptChannel:	233✔
233	msg = &AcceptChannel{}	233✔
234	case MsgFundingCreated:	173✔
235	msg = &FundingCreated{}	173✔
236	case MsgFundingSigned:	168✔
237	msg = &FundingSigned{}	168✔
238	case MsgChannelReady:	175✔
239	msg = &ChannelReady{}	175✔
240	case MsgShutdown:	185✔
241	msg = &Shutdown{}	185✔
242	case MsgClosingSigned:	173✔
243	msg = &ClosingSigned{}	173✔
244	case MsgDynPropose:	246✔
245	msg = &DynPropose{}	246✔
246	case MsgDynAck:	165✔
247	msg = &DynAck{}	165✔
248	case MsgDynReject:	159✔
249	msg = &DynReject{}	159✔
250	case MsgKickoffSig:	129✔
251	msg = &KickoffSig{}	129✔
252	case MsgUpdateAddHTLC:	2,154✔
253	msg = &UpdateAddHTLC{}	2,154✔
254	case MsgUpdateFailHTLC:	570✔
255	msg = &UpdateFailHTLC{}	570✔
256	case MsgUpdateFulfillHTLC:	1,056✔
257	msg = &UpdateFulfillHTLC{}	1,056✔
258	case MsgCommitSig:	2,224✔
259	msg = &CommitSig{}	2,224✔
260	case MsgRevokeAndAck:	163✔
261	msg = &RevokeAndAck{}	163✔
262	case MsgUpdateFee:	203✔
263	msg = &UpdateFee{}	203✔
264	case MsgUpdateFailMalformedHTLC:	135✔
265	msg = &UpdateFailMalformedHTLC{}	135✔
266	case MsgChannelReestablish:	169✔
267	msg = &ChannelReestablish{}	169✔
268	case MsgError:	113✔
269	msg = &Error{}	113✔
270	case MsgChannelAnnouncement:	157✔
271	msg = &ChannelAnnouncement1{}	157✔
272	case MsgChannelUpdate:	147✔
273	msg = &ChannelUpdate1{}	147✔
274	case MsgNodeAnnouncement:	445✔
275	msg = &NodeAnnouncement{}	445✔
276	case MsgPing:	112✔
277	msg = &Ping{}	112✔
278	case MsgAnnounceSignatures:	128✔
279	msg = &AnnounceSignatures1{}	128✔
280	case MsgPong:	109✔
281	msg = &Pong{}	109✔
282	case MsgQueryShortChanIDs:	1,157✔
283	msg = &QueryShortChanIDs{}	1,157✔
284	case MsgReplyShortChanIDsEnd:	130✔
285	msg = &ReplyShortChanIDsEnd{}	130✔
286	case MsgQueryChannelRange:	121✔
287	msg = &QueryChannelRange{}	121✔
288	case MsgReplyChannelRange:	1,216✔
289	msg = &ReplyChannelRange{}	1,216✔
290	case MsgGossipTimestampRange:	120✔
291	msg = &GossipTimestampRange{}	120✔
292	case MsgClosingComplete:	173✔
293	msg = &ClosingComplete{}	173✔
294	case MsgClosingSig:	162✔
295	msg = &ClosingSig{}	162✔
296	case MsgAnnounceSignatures2:	100✔
297	msg = &AnnounceSignatures2{}	100✔
298	case MsgChannelAnnouncement2:	100✔
299	msg = &ChannelAnnouncement2{}	100✔
300	case MsgChannelUpdate2:	100✔
301	msg = &ChannelUpdate2{}	100✔
302	default:	10✔
303	// If the message is not within our custom range and has not	10✔
304	// specifically been overridden, return an unknown message.	10✔
305	//	10✔
306	// Note that we do not allow custom message overrides to replace	10✔
307	// known message types, only protocol messages that are not yet	10✔
308	// known to lnd.	10✔
309	if msgType < CustomTypeStart && !IsCustomOverride(msgType) {	11✔
310	return nil, &UnknownMessage{msgType}	1✔
311	}	1✔
312
313	msg = &Custom{	9✔
314	Type: msgType,	9✔
315	}	9✔
316	}
317
318	return msg, nil	13,739✔
319	}
320
321	// WriteMessage writes a lightning Message to a buffer including the necessary
322	// header information and returns the number of bytes written. If any error is
323	// encountered, the buffer passed will be reset to its original state since we
324	// don't want any broken bytes left. In other words, no bytes will be written
325	// if there's an error. Either all or none of the message bytes will be written
326	// to the buffer.
327	//
328	// NOTE: this method is not concurrent safe.
329	func WriteMessage(buf *bytes.Buffer, msg Message, pver uint32) (int, error) {	12,869✔
330	// Record the size of the bytes already written in buffer.	12,869✔
331	oldByteSize := buf.Len()	12,869✔
332		12,869✔
333	// cleanBrokenBytes is a helper closure that helps reset the buffer to	12,869✔
334	// its original state. It truncates all the bytes written in current	12,869✔
335	// scope.	12,869✔
336	var cleanBrokenBytes = func(b *bytes.Buffer) int {	12,873✔
337	b.Truncate(oldByteSize)	4✔
338	return 0	4✔
339	}	4✔
340
341	// Write the message type.
342	var mType [2]byte	12,869✔
343	binary.BigEndian.PutUint16(mType[:], uint16(msg.MsgType()))	12,869✔
344	msgTypeBytes, err := buf.Write(mType[:])	12,869✔
345	if err != nil {	12,869✔
346	return cleanBrokenBytes(buf), ErrorWriteMessageType(err)	×
347	}	×
348
349	// Use the write buffer to encode our message.
350	if err := msg.Encode(buf, pver); err != nil {	12,872✔
351	return cleanBrokenBytes(buf), ErrorEncodeMessage(err)	3✔
352	}	3✔
353
354	// Enforce maximum overall message payload. The write buffer now has
355	// the size of len(originalBytes) + len(payload) + len(type). We want
356	// to enforce the payload here, so we subtract it by the length of the
357	// type and old bytes.
358	lenp := buf.Len() - oldByteSize - msgTypeBytes	12,866✔
359	if lenp > MaxMsgBody {	12,867✔
360	return cleanBrokenBytes(buf), ErrorPayloadTooLarge(lenp)	1✔
361	}	1✔
362
363	return buf.Len() - oldByteSize, nil	12,865✔
364	}
365
366	// ReadMessage reads, validates, and parses the next Lightning message from r
367	// for the provided protocol version.
368	func ReadMessage(r io.Reader, pver uint32) (Message, error) {	13,739✔
369	// First, we'll read out the first two bytes of the message so we can	13,739✔
370	// create the proper empty message.	13,739✔
371	var mType [2]byte	13,739✔
372	if _, err := io.ReadFull(r, mType[:]); err != nil {	13,739✔
373	return nil, err	×
374	}	×
375
376	msgType := MessageType(binary.BigEndian.Uint16(mType[:]))	13,739✔
377		13,739✔
378	// Now that we know the target message type, we can create the proper	13,739✔
379	// empty message type and decode the message into it.	13,739✔
380	msg, err := makeEmptyMessage(msgType)	13,739✔
381	if err != nil {	13,739✔
UNCOV 382	return nil, err	×
UNCOV 383	}	×
384	if err := msg.Decode(r, pver); err != nil {	15,501✔
385	return nil, err	1,762✔
386	}	1,762✔
387
388	return msg, nil	11,977✔
389	}

lightningnetwork / lnd / 11880886288

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