-
Notifications
You must be signed in to change notification settings - Fork 34
/
msgcmpctblock.go
186 lines (171 loc) · 4.54 KB
/
msgcmpctblock.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
package wire
/*
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"math"
"github.com/copernet/copernicus/model/block"
"github.com/copernet/copernicus/util"
)
const ShortTxIDsLength = 6
type PreFilledTransaction struct {
Tx *MsgTx
Index uint16
}
type MsgCmpctBlock struct {
shortTxidk0 uint64
shortTxidk1 uint64
Nonce uint64
ShortTxids []uint64
PreFilledTxn []PreFilledTransaction
Header block.BlockHeader
}
func NewMsgCmpctBlock(block *MsgBlock) *MsgCmpctBlock {
nonce, _ := util.RandomUint64()
shortids := make([]uint64, len(block.Txs)-1)
prefilledTxn := make([]PreFilledTransaction, 1)
header := block.Header
id0, id1, err := fillShortTxIDSelector(&header, nonce)
if err != nil {
return nil
}
prefilledTxn[0].Index = 0
prefilledTxn[0].Tx = (*MsgTx)(block.Txs[0])
for i := 1; i < len(block.Txs); i++ {
txhash := block.Txs[i].GetHash()
shortids[i-1] = getShortID(id0, id1, &txhash)
}
return &MsgCmpctBlock{
shortTxidk0: id0,
shortTxidk1: id1,
Nonce: nonce,
ShortTxids: shortids,
PreFilledTxn: prefilledTxn,
Header: header,
}
}
func fillShortTxIDSelector(h *block.BlockHeader, nonce uint64) (uint64, uint64, error) {
bw := bytes.NewBuffer(nil)
if err := h.Serialize(bw); err != nil {
return 0, 0, err
}
if err := util.WriteElements(bw, nonce); err != nil {
return 0, 0, err
}
hb := util.Sha256Bytes(bw.Bytes())
return binary.LittleEndian.Uint64(hb[0:8]), binary.LittleEndian.Uint64(hb[8:16]), nil
}
func getShortID(id0, id1 uint64, hash *util.Hash) uint64 {
return util.SipHash(id0, id1, (*hash)[:]) & 0xffffffffffff
}
func (pft *PreFilledTransaction) Decode(r io.Reader, pver uint32, enc MessageEncoding) error {
idx, err := util.ReadVarInt(r)
if err != nil {
return err
}
if idx > math.MaxUint16 {
return messageError("MsgCmpctBlock.Decode", fmt.Sprintf("index overflowed 16-bits"))
}
pft.Index = uint16(idx)
err = pft.Tx.Decode(r, pver, enc)
return err
}
func (pft *PreFilledTransaction) Encode(w io.Writer, pver uint32, enc MessageEncoding) error {
if err := util.WriteVarInt(w, uint64(pft.Index)); err != nil {
return err
}
if err := pft.Tx.Encode(w, pver, enc); err != nil {
return err
}
return nil
}
func (msg *MsgCmpctBlock) Decode(r io.Reader, pver uint32, enc MessageEncoding) error {
if pver < ShortIdsBlocksVersion {
str := fmt.Sprintf("cmpctblock message invalid for protocol "+
"version %d", pver)
return messageError("MsgCmpctBlock.Decode", str)
}
if err := msg.Header.Unserialize(r); err != nil {
return err
}
if err := util.ReadElements(r, &msg.Nonce); err != nil {
return err
}
shortIDSize, err := util.ReadVarInt(r)
if err != nil {
return err
}
ids := make([]uint64, shortIDSize)
for i := 0; i < len(ids); i++ {
lsb := uint32(0)
msb := uint16(0)
if err := util.ReadElements(r, &lsb); err != nil {
return err
}
if err := util.ReadElements(r, &msb); err != nil {
return err
}
ids[i] = (uint64(msb) << 32) | uint64(lsb)
}
msg.ShortTxids = append(msg.ShortTxids, ids...)
pftLen, err := util.ReadVarInt(r)
if err != nil {
return err
}
vpft := make([]PreFilledTransaction, pftLen)
for i := 0; i < len(vpft); i++ {
if err := vpft[i].Decode(r, pver, enc); err != nil {
return err
}
}
id0, id1, err := fillShortTxIDSelector(&msg.Header, msg.Nonce)
if err != nil {
return err
}
msg.shortTxidk0 = id0
msg.shortTxidk1 = id1
return nil
}
func (msg *MsgCmpctBlock) Encode(w io.Writer, pver uint32, enc MessageEncoding) error {
if pver < ShortIdsBlocksVersion {
str := fmt.Sprintf("cmpctblock message invalid for protocol "+
"version %d", pver)
return messageError("MsgCmpctBlock.Encode", str)
}
if err := msg.Header.Serialize(w); err != nil {
return err
}
if err := util.WriteElements(w, &msg.Nonce); err != nil {
return err
}
if err := util.WriteVarInt(w, uint64(len(msg.ShortTxids))); err != nil {
return err
}
for i := 0; i < len(msg.ShortTxids); i++ {
var lsb uint32
var msb uint16
lsb = uint32(msg.ShortTxids[i] & 0xffffffff)
msb = uint16((msg.ShortTxids[i] >> 32) & 0xffff)
if err := util.WriteElements(w, lsb); err != nil {
return err
}
if err := util.WriteElements(w, msb); err != nil {
return err
}
}
for i := 0; i < len(msg.PreFilledTxn); i++ {
if err := msg.PreFilledTxn[i].Encode(w, pver, enc); err != nil {
return err
}
}
return nil
}
func (msg *MsgCmpctBlock) Command() string {
return CmdCmpctBlock
}
func (msg *MsgCmpctBlock) MaxPayloadLength(pver uint32) uint64 {
return 80 + 8 + 3 + uint64(len(msg.ShortTxids))*6 + 3 + uint64(len(msg.PreFilledTxn))*(3+MaxBlockPayload)
}
*/