-
Notifications
You must be signed in to change notification settings - Fork 16
/
prepare_lock.go
204 lines (156 loc) · 5.01 KB
/
prepare_lock.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
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
/*
*/
package btc
import (
"bytes"
"encoding/hex"
"github.com/blockcypher/gobcy"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil"
"github.com/google/uuid"
"github.com/Oneledger/protocol/action"
"github.com/Oneledger/protocol/action/btc"
"github.com/Oneledger/protocol/chains/bitcoin"
"github.com/Oneledger/protocol/client"
"github.com/Oneledger/protocol/serialize"
codes "github.com/Oneledger/protocol/status_codes"
)
const (
MINIMUM_CONFIRMATIONS_REQ = 6
MINIMUM_CONFIRMATIONS_REQ_TEST = 1
)
// PrepareLock
func (s *Service) PrepareLock(args client.BTCLockPrepareRequest, reply *client.BTCLockPrepareResponse) error {
cfg := s.trackerStore.GetConfig()
cd := bitcoin.NewChainDriver(cfg.BlockCypherToken)
btc := gobcy.API{cfg.BlockCypherToken, "btc", cfg.BlockCypherChainType}
cdInput := make([]bitcoin.InputTransaction, 0, len(args.Inputs))
var totalInput int64 = 0
for _, input := range args.Inputs {
tx, err := btc.GetTX(input.Hash, nil)
if err != nil {
s.logger.Error("error in getting txn from bitcoin network", err)
return codes.ErrBTCReadingTxn
}
if tx.Confirmations < MINIMUM_CONFIRMATIONS_REQ {
s.logger.Error("not enough txn confirmations", err)
return codes.ErrBTCNotEnoughConfirmations
}
if tx.Outputs[input.Index].SpentBy != "" {
s.logger.Error("source is not spendable", err)
return codes.ErrBTCNotSpendable
}
hashh, _ := chainhash.NewHashFromStr(tx.Hash)
inputAmount := int64(tx.Outputs[input.Index].Value)
totalInput += inputAmount
cdInput = append(cdInput, bitcoin.InputTransaction{hashh, input.Index, inputAmount})
}
//tracker, err := s.trackerStore.Get("tracker_1")
tracker, err := s.trackerStore.GetTrackerForLock()
if err != nil {
s.logger.Error("error getting tracker for lock", err)
return codes.ErrGettingTracker
}
s.logger.Infof("%#v \n", tracker)
returnAddress, err := btcutil.DecodeAddress(args.ReturnAddressStr, cfg.BTCParams)
if err != nil {
return codes.ErrBadBTCAddress.Wrap(err)
}
returnAddressBytes, err := txscript.PayToAddrScript(returnAddress)
if err != nil {
return codes.ErrBadBTCAddress.Wrap(err)
}
txnBytes, err := cd.PrepareLockNew(tracker.CurrentTxId, 0, tracker.CurrentBalance,
cdInput, args.FeeRate, args.AmountSatoshi, returnAddressBytes, tracker.ProcessLockScriptAddress)
if err != nil {
return codes.ErrBadBTCTxn.Wrap(err)
}
reply.Txn = hex.EncodeToString(txnBytes)
reply.TrackerName = tracker.Name
return nil
}
func (s *Service) AddUserSignatureAndProcessLock(args client.BTCLockRequest, reply *client.CreateTxReply) error {
tracker, err := s.trackerStore.Get(args.TrackerName)
if err != nil {
// tracker of that name not found
return codes.ErrTrackerNotFound
}
if tracker.IsBusy() {
// tracker not available anymore, try another tracker
return codes.ErrTrackerBusy
}
cfg := s.trackerStore.GetConfig()
// add the users' btc signature to the redeem txn in the appropriate place
s.logger.Debug("----", hex.EncodeToString(args.Txn))
newBTCTx := wire.NewMsgTx(wire.TxVersion)
buf := bytes.NewBuffer(args.Txn)
newBTCTx.Deserialize(buf)
totalLockAmount := newBTCTx.TxOut[0].Value - tracker.CurrentBalance
isFirstLock := tracker.CurrentTxId == nil
if isFirstLock {
// if this is first lock for tracker, then all inputs must be signed
for i := range newBTCTx.TxIn {
if len(newBTCTx.TxIn[i].SignatureScript) == 0 {
s.logger.Error("all user sources for lock are not signed")
return codes.ErrBadBTCTxn
}
}
} else {
// if not the first tracker txn then the first input should be
// tracker previous txn
if *tracker.CurrentTxId != newBTCTx.TxIn[0].PreviousOutPoint.Hash ||
newBTCTx.TxIn[0].PreviousOutPoint.Index != 0 {
// incorrect txn
s.logger.Error("btc txn doesn;t match tracker")
return codes.ErrBadBTCTxn
}
for i := range newBTCTx.TxIn {
if i == 0 {
continue
}
if len(newBTCTx.TxIn[i].SignatureScript) == 0 {
s.logger.Error("all user sources for lock are not signed")
return codes.ErrBadBTCTxn
}
}
}
if !bitcoin.ValidateLock(newBTCTx, cfg.BlockCypherToken, cfg.BlockCypherChainType,
tracker.ProcessLockScriptAddress, tracker.CurrentBalance, totalLockAmount, isFirstLock) {
return codes.ErrBadBTCTxn
}
var txBytes []byte
buf = bytes.NewBuffer(txBytes)
err = newBTCTx.Serialize(buf)
if err != nil {
return codes.ErrSerialization
}
txBytes = buf.Bytes()
lock := btc.Lock{
Locker: args.Address,
TrackerName: args.TrackerName,
BTCTxn: txBytes,
LockAmount: totalLockAmount,
}
data, err := lock.Marshal()
if err != nil {
return codes.ErrSerialization
}
uuidNew, _ := uuid.NewUUID()
fee := action.Fee{args.GasPrice, args.Gas}
tx := &action.RawTx{
Type: action.BTC_LOCK,
Data: data,
Fee: fee,
Memo: uuidNew.String(),
}
packet, err := serialize.GetSerializer(serialize.NETWORK).Serialize(tx)
if err != nil {
return codes.ErrSerialization
}
*reply = client.CreateTxReply{
RawTx: packet,
}
return nil
}