forked from OpenBazaar/go-ethwallet
/
wallet.go
1518 lines (1331 loc) · 42 KB
/
wallet.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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
package wallet
import (
"bytes"
"context"
"crypto/ecdsa"
"encoding/binary"
"encoding/gob"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"math/big"
"net/http"
"path"
"runtime"
"sort"
"strconv"
"strings"
"time"
"github.com/OpenBazaar/multiwallet/config"
wi "github.com/OpenBazaar/wallet-interface"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcutil"
hd "github.com/btcsuite/btcutil/hdkeychain"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/accounts/keystore"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/nanmu42/etherscan-api"
"github.com/op/go-logging"
"golang.org/x/net/proxy"
"gopkg.in/yaml.v2"
"github.com/OpenBazaar/go-ethwallet/util"
ut "github.com/OpenBazaar/openbazaar-go/util"
)
var _ = wi.Wallet(&EthereumWallet{})
var done, doneBalanceTicker chan bool
const (
// InfuraAPIKey is the hard coded Infura API key
InfuraAPIKey = "v3/91c82af0169c4115940c76d331410749"
// EtherScanAPIKey is needed for all Eherscan requests
EtherScanAPIKey = "KA15D8FCHGBFZ4CQ25Y4NZM24417AXWF7M"
maxGasLimit = 400000
)
var (
emptyChainHash *chainhash.Hash
// EthCurrencyDefinition is eth defaults
EthCurrencyDefinition = wi.CurrencyDefinition{
Code: "ETH",
Divisibility: 18,
}
log = logging.MustGetLogger("ethwallet")
)
func init() {
mustInitEmptyChainHash()
}
func mustInitEmptyChainHash() {
hash, err := chainhash.NewHashFromStr("")
if err != nil {
panic(fmt.Sprintf("creating emptyChainHash: %s", err.Error()))
}
emptyChainHash = hash
}
// EthConfiguration - used for eth specific configuration
type EthConfiguration struct {
RopstenPPAddress string `yaml:"ROPSTEN_PPv2_ADDRESS"`
RegistryAddress string `yaml:"ROPSTEN_REGISTRY"`
}
// EthRedeemScript - used to represent redeem script for eth wallet
// <uniqueId: 20><threshold:1><timeoutHours:4><buyer:20><seller:20>
// <moderator:20><multisigAddress:20><tokenAddress:20>
type EthRedeemScript struct {
TxnID common.Address
Threshold uint8
Timeout uint32
Buyer common.Address
Seller common.Address
Moderator common.Address
MultisigAddress common.Address
TokenAddress common.Address
}
// SerializeEthScript - used to serialize eth redeem script
func SerializeEthScript(scrpt EthRedeemScript) ([]byte, error) {
b := bytes.Buffer{}
e := gob.NewEncoder(&b)
err := e.Encode(scrpt)
return b.Bytes(), err
}
// DeserializeEthScript - used to deserialize eth redeem script
func DeserializeEthScript(b []byte) (EthRedeemScript, error) {
scrpt := EthRedeemScript{}
buf := bytes.NewBuffer(b)
d := gob.NewDecoder(buf)
err := d.Decode(&scrpt)
return scrpt, err
}
// PendingTxn used to record a pending eth txn
type PendingTxn struct {
TxnID common.Hash
OrderID string
Amount string
Nonce int32
From string
To string
WithInput bool
}
// SerializePendingTxn - used to serialize eth pending txn
func SerializePendingTxn(pTxn PendingTxn) ([]byte, error) {
b := bytes.Buffer{}
e := gob.NewEncoder(&b)
err := e.Encode(pTxn)
return b.Bytes(), err
}
// DeserializePendingTxn - used to deserialize eth pending txn
func DeserializePendingTxn(b []byte) (PendingTxn, error) {
pTxn := PendingTxn{}
buf := bytes.NewBuffer(b)
d := gob.NewDecoder(buf)
err := d.Decode(&pTxn)
return pTxn, err
}
// GenScriptHash - used to generate script hash for eth as per
// escrow smart contract
func GenScriptHash(script EthRedeemScript) ([32]byte, string, error) {
a := make([]byte, 4)
binary.BigEndian.PutUint32(a, script.Timeout)
arr := append(script.TxnID.Bytes(), append([]byte{script.Threshold},
append(a[:], append(script.Buyer.Bytes(),
append(script.Seller.Bytes(), append(script.Moderator.Bytes(),
append(script.MultisigAddress.Bytes())...)...)...)...)...)...)
var retHash [32]byte
copy(retHash[:], crypto.Keccak256(arr)[:])
ahashStr := hexutil.Encode(retHash[:])
return retHash, ahashStr, nil
}
// EthereumWallet is the wallet implementation for ethereum
type EthereumWallet struct {
client *EthClient
account *Account
address *EthAddress
service *Service
registry *Registry
ppsct *Escrow
db wi.Datastore
exchangeRates wi.ExchangeRates
params *chaincfg.Params
listeners []func(wi.TransactionCallback)
}
// NewEthereumWalletWithKeyfile will return a reference to the Eth Wallet
func NewEthereumWalletWithKeyfile(url, keyFile, passwd string) *EthereumWallet {
client, err := NewEthClient(url)
if err != nil {
log.Fatalf("error initializing wallet: %v", err)
}
var myAccount *Account
myAccount, err = NewAccountFromKeyfile(keyFile, passwd)
if err != nil {
log.Fatalf("key file validation failed: %s", err.Error())
}
addr := myAccount.Address()
_, filename, _, _ := runtime.Caller(0)
conf, err := ioutil.ReadFile(path.Join(path.Dir(filename), "../configuration.yaml"))
if err != nil {
log.Fatalf("ethereum config not found: %s", err.Error())
}
ethConfig := EthConfiguration{}
err = yaml.Unmarshal(conf, ðConfig)
if err != nil {
log.Fatalf("ethereum config not valid: %s", err.Error())
}
reg, err := NewRegistry(common.HexToAddress(ethConfig.RegistryAddress), client)
if err != nil {
log.Fatalf("error initilaizing contract failed: %s", err.Error())
}
return &EthereumWallet{client, myAccount, &EthAddress{&addr}, &Service{}, reg, nil, nil, nil, nil, []func(wi.TransactionCallback){}}
}
// NewEthereumWallet will return a reference to the Eth Wallet
func NewEthereumWallet(cfg config.CoinConfig, params *chaincfg.Params, mnemonic string, proxy proxy.Dialer) (*EthereumWallet, error) {
client, err := NewEthClient(cfg.ClientAPIs[0] + "/" + InfuraAPIKey)
if err != nil {
log.Errorf("error initializing wallet: %v", err)
return nil, err
}
var myAccount *Account
myAccount, err = NewAccountFromMnemonic(mnemonic, "", params)
if err != nil {
log.Errorf("mnemonic based pk generation failed: %s", err.Error())
return nil, err
}
addr := myAccount.Address()
ethConfig := EthConfiguration{}
var regAddr interface{}
var ok bool
registryKey := "RegistryAddress"
if strings.Contains(cfg.ClientAPIs[0], "rinkeby") {
registryKey = "RinkebyRegistryAddress"
} else if strings.Contains(cfg.ClientAPIs[0], "ropsten") {
registryKey = "RopstenRegistryAddress"
}
if regAddr, ok = cfg.Options[registryKey]; !ok {
log.Errorf("ethereum registry not found: %s", cfg.Options[registryKey])
return nil, err
}
ethConfig.RegistryAddress = regAddr.(string)
reg, err := NewRegistry(common.HexToAddress(ethConfig.RegistryAddress), client)
if err != nil {
log.Errorf("error initilaizing contract failed: %s", err.Error())
return nil, err
}
er := NewEthereumPriceFetcher(proxy)
return &EthereumWallet{client, myAccount, &EthAddress{&addr}, &Service{}, reg, nil, cfg.DB, er, params, []func(wi.TransactionCallback){}}, nil
}
// Params - return nil to comply
func (wallet *EthereumWallet) Params() *chaincfg.Params {
return wallet.params
}
// GetBalance returns the balance for the wallet
func (wallet *EthereumWallet) GetBalance() (*big.Int, error) {
return wallet.client.GetBalance(wallet.account.Address())
}
// GetUnconfirmedBalance returns the unconfirmed balance for the wallet
func (wallet *EthereumWallet) GetUnconfirmedBalance() (*big.Int, error) {
return wallet.client.GetUnconfirmedBalance(wallet.account.Address())
}
// Transfer will transfer the amount from this wallet to the spec address
func (wallet *EthereumWallet) Transfer(to string, value *big.Int, spendAll bool, fee big.Int) (common.Hash, error) {
toAddress := common.HexToAddress(to)
return wallet.client.Transfer(wallet.account, toAddress, value, spendAll, fee)
}
// Start will start the wallet daemon
func (wallet *EthereumWallet) Start() {
done = make(chan bool)
doneBalanceTicker = make(chan bool)
// start the ticker to check for pending txn rcpts
go func(wallet *EthereumWallet) {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
case <-done:
return
case <-ticker.C:
// get the pending txns
txns, err := wallet.db.Txns().GetAll(true)
if err != nil {
continue
}
for _, txn := range txns {
hash := common.HexToHash(txn.Txid)
go func(txnData []byte) {
_, err := wallet.checkTxnRcpt(&hash, txnData)
if err != nil {
log.Errorf(err.Error())
}
}(txn.Bytes)
}
}
}
}(wallet)
// start the ticker to check for balance
go func(wallet *EthereumWallet) {
ticker := time.NewTicker(15 * time.Second)
defer ticker.Stop()
currentBalance, err := wallet.GetBalance()
if err != nil {
log.Infof("err fetching initial balance: %v", err)
}
currentTip, _ := wallet.ChainTip()
for {
select {
case <-doneBalanceTicker:
return
case <-ticker.C:
// fetch the current balance
fetchedBalance, err := wallet.GetBalance()
if err != nil {
log.Infof("err fetching balance at %v: %v", time.Now(), err)
continue
}
if fetchedBalance.Cmp(currentBalance) != 0 {
// process balance change
go wallet.processBalanceChange(currentBalance, fetchedBalance, currentTip)
currentTip, _ = wallet.ChainTip()
currentBalance = fetchedBalance
}
}
}
}(wallet)
}
func (wallet *EthereumWallet) processBalanceChange(previousBalance, currentBalance *big.Int, currentHead uint32) {
count := 0
cTip := int(currentHead)
value := new(big.Int).Sub(currentBalance, previousBalance)
for count < 30 {
txns, err := wallet.TransactionsFromBlock(&cTip)
if err == nil && len(txns) > 0 {
count = 30
txncb := wi.TransactionCallback{
Txid: util.EnsureCorrectPrefix(txns[0].Txid),
Outputs: []wi.TransactionOutput{},
Inputs: []wi.TransactionInput{},
Height: txns[0].Height,
Timestamp: time.Now(),
Value: *value,
WatchOnly: false,
}
for _, l := range wallet.listeners {
go l(txncb)
}
continue
}
time.Sleep(2 * time.Second)
count++
}
}
func (wallet *EthereumWallet) invokeTxnCB(txnID string, value *big.Int) {
txncb := wi.TransactionCallback{
Txid: util.EnsureCorrectPrefix(txnID),
Outputs: []wi.TransactionOutput{},
Inputs: []wi.TransactionInput{},
Height: 0,
Timestamp: time.Now(),
Value: *value,
WatchOnly: false,
}
for _, l := range wallet.listeners {
go l(txncb)
}
}
// CurrencyCode returns ETH
func (wallet *EthereumWallet) CurrencyCode() string {
if wallet.params == nil {
return "ETH"
}
if wallet.params.Name == chaincfg.MainNetParams.Name {
return "ETH"
} else {
return "TETH"
}
//return "ETH"
}
// IsDust Check if this amount is considered dust - 10000 wei
func (wallet *EthereumWallet) IsDust(amount big.Int) bool {
return amount.Cmp(big.NewInt(10000)) <= 0
}
// MasterPrivateKey - Get the master private key
func (wallet *EthereumWallet) MasterPrivateKey() *hd.ExtendedKey {
return hd.NewExtendedKey([]byte{0x00, 0x00, 0x00, 0x00}, wallet.account.privateKey.D.Bytes(),
wallet.account.address.Bytes(), wallet.account.address.Bytes(), 0, 0, true)
}
// MasterPublicKey - Get the master public key
func (wallet *EthereumWallet) MasterPublicKey() *hd.ExtendedKey {
publicKey := wallet.account.privateKey.Public()
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
if !ok {
log.Fatal("error casting public key to ECDSA")
}
publicKeyBytes := crypto.FromECDSAPub(publicKeyECDSA)
return hd.NewExtendedKey([]byte{0x00, 0x00, 0x00, 0x00}, publicKeyBytes,
wallet.account.address.Bytes(), wallet.account.address.Bytes(), 0, 0, false)
}
// ChildKey Generate a child key using the given chaincode. The key is used in multisig transactions.
// For most implementations this should just be child key 0.
func (wallet *EthereumWallet) ChildKey(keyBytes []byte, chaincode []byte, isPrivateKey bool) (*hd.ExtendedKey, error) {
parentFP := []byte{0x00, 0x00, 0x00, 0x00}
version := []byte{0x04, 0x88, 0xad, 0xe4} // starts with xprv
if !isPrivateKey {
version = []byte{0x04, 0x88, 0xb2, 0x1e}
}
/*
hdKey := hd.NewExtendedKey(
version,
keyBytes,
chaincode,
parentFP,
0,
0,
isPrivateKey)
return hdKey.Child(0)
*/
return hd.NewExtendedKey(version, keyBytes, chaincode, parentFP, 0, 0, isPrivateKey), nil
}
// CurrentAddress - Get the current address for the given purpose
func (wallet *EthereumWallet) CurrentAddress(purpose wi.KeyPurpose) btcutil.Address {
return *wallet.address
}
// NewAddress - Returns a fresh address that has never been returned by this function
func (wallet *EthereumWallet) NewAddress(purpose wi.KeyPurpose) btcutil.Address {
return *wallet.address
}
// DecodeAddress - Parse the address string and return an address interface
func (wallet *EthereumWallet) DecodeAddress(addr string) (btcutil.Address, error) {
var (
ethAddr common.Address
err error
)
if len(addr) > 64 {
ethAddr, err = ethScriptToAddr(addr)
if err != nil {
log.Error(err.Error())
}
} else {
ethAddr = common.HexToAddress(addr)
}
return EthAddress{ðAddr}, err
}
func ethScriptToAddr(addr string) (common.Address, error) {
rScriptBytes, err := hex.DecodeString(addr)
if err != nil {
return common.Address{}, err
}
rScript, err := DeserializeEthScript(rScriptBytes)
if err != nil {
return common.Address{}, err
}
_, sHash, err := GenScriptHash(rScript)
if err != nil {
return common.Address{}, err
}
return common.HexToAddress(sHash), nil
}
// ScriptToAddress - ?
func (wallet *EthereumWallet) ScriptToAddress(script []byte) (btcutil.Address, error) {
return wallet.address, nil
}
// HasKey - Returns if the wallet has the key for the given address
func (wallet *EthereumWallet) HasKey(addr btcutil.Address) bool {
if !util.IsValidAddress(addr.String()) {
return false
}
return wallet.account.Address().String() == addr.String()
}
// Balance - Get the confirmed and unconfirmed balances
func (wallet *EthereumWallet) Balance() (confirmed, unconfirmed wi.CurrencyValue) {
var balance, ucbalance wi.CurrencyValue
bal, err := wallet.GetBalance()
if err == nil {
balance = wi.CurrencyValue{
Value: *bal,
Currency: EthCurrencyDefinition,
}
}
ucbal, err := wallet.GetUnconfirmedBalance()
ucb := big.NewInt(0)
if err == nil {
if ucbal.Cmp(bal) > 0 {
ucb.Sub(ucbal, bal)
}
}
ucbalance = wi.CurrencyValue{
Value: *ucb,
Currency: EthCurrencyDefinition,
}
return balance, ucbalance
}
// TransactionsFromBlock - Returns a list of transactions for this wallet begining from the specified block
func (wallet *EthereumWallet) TransactionsFromBlock(startBlock *int) ([]wi.Txn, error) {
txns, err := wallet.client.eClient.NormalTxByAddress(util.EnsureCorrectPrefix(wallet.account.Address().String()), startBlock, nil,
1, 0, false)
if err != nil {
log.Error("err fetching transactions : ", err)
return []wi.Txn{}, nil
}
ret := []wi.Txn{}
for _, t := range txns {
status := wi.StatusConfirmed
prefix := ""
if t.IsError != 0 {
status = wi.StatusError
}
if strings.ToLower(t.From) == strings.ToLower(wallet.address.String()) {
prefix = "-"
}
tnew := wi.Txn{
Txid: util.EnsureCorrectPrefix(t.Hash),
Value: prefix + t.Value.Int().String(),
Height: int32(t.BlockNumber),
Timestamp: t.TimeStamp.Time(),
WatchOnly: false,
Confirmations: int64(t.Confirmations),
Status: wi.StatusCode(status),
Bytes: []byte(t.Input),
}
ret = append(ret, tnew)
}
return ret, nil
}
// Transactions - Returns a list of transactions for this wallet
func (wallet *EthereumWallet) Transactions() ([]wi.Txn, error) {
return wallet.TransactionsFromBlock(nil)
}
// GetTransaction - Get info on a specific transaction
func (wallet *EthereumWallet) GetTransaction(txid chainhash.Hash) (wi.Txn, error) {
tx, _, err := wallet.client.GetTransaction(common.HexToHash(util.EnsureCorrectPrefix(txid.String())))
if err != nil {
return wi.Txn{}, err
}
chainID, err := wallet.client.NetworkID(context.Background())
if err != nil {
return wi.Txn{}, err
}
msg, err := tx.AsMessage(types.NewEIP155Signer(chainID)) // HomesteadSigner{})
if err != nil {
return wi.Txn{}, err
}
//value := tx.Value().String()
fromAddr := msg.From()
toAddr := msg.To()
valueSub := big.NewInt(5000000)
v, err := wallet.registry.GetRecommendedVersion(nil, "escrow")
if err == nil {
if tx.To().String() == v.Implementation.String() {
toAddr = wallet.address.address
}
if msg.Value().Cmp(valueSub) > 0 {
valueSub = msg.Value()
}
}
return wi.Txn{
Txid: util.EnsureCorrectPrefix(tx.Hash().Hex()),
Value: tx.Value().String(),
Height: 0,
Timestamp: time.Now(),
WatchOnly: false,
Bytes: tx.Data(),
ToAddress: util.EnsureCorrectPrefix(tx.To().String()),
FromAddress: util.EnsureCorrectPrefix(msg.From().Hex()),
Outputs: []wi.TransactionOutput{
{
Address: EthAddress{toAddr},
Value: *valueSub,
Index: 0,
},
{
Address: EthAddress{&fromAddr},
Value: *valueSub,
Index: 1,
},
{
Address: EthAddress{msg.To()},
Value: *valueSub,
Index: 2,
},
},
}, nil
}
// ChainTip - Get the height and best hash of the blockchain
func (wallet *EthereumWallet) ChainTip() (uint32, chainhash.Hash) {
num, hash, err := wallet.client.GetLatestBlock()
if err != nil {
return 0, *emptyChainHash
}
h, err := util.CreateChainHash(hash.Hex())
if err != nil {
log.Error(err.Error())
h = emptyChainHash
}
return num, *h
}
// GetFeePerByte - Get the current fee per byte
func (wallet *EthereumWallet) GetFeePerByte(feeLevel wi.FeeLevel) big.Int {
est, err := wallet.client.GetEthGasStationEstimate()
ret := big.NewInt(0)
if err != nil {
log.Errorf("err fetching ethgas station data: %v", err)
return *ret
}
switch feeLevel {
case wi.NORMAL:
ret, _ = big.NewFloat(est.Average * 100000000).Int(nil)
case wi.ECONOMIC, wi.SUPER_ECONOMIC:
ret, _ = big.NewFloat(est.SafeLow * 100000000).Int(nil)
case wi.PRIOIRTY, wi.FEE_BUMP:
ret, _ = big.NewFloat(est.Fast * 100000000).Int(nil)
}
return *ret
}
// Spend - Send ether to an external wallet
func (wallet *EthereumWallet) Spend(amount big.Int, addr btcutil.Address, feeLevel wi.FeeLevel, referenceID string, spendAll bool) (*chainhash.Hash, error) {
var hash common.Hash
var h *chainhash.Hash
var err error
actualRecipient := addr
if referenceID == "" {
// no referenceID means this is a direct transfer
hash, err = wallet.Transfer(util.EnsureCorrectPrefix(addr.String()), &amount, spendAll, wallet.GetFeePerByte(feeLevel))
} else {
// this is a spend which means it has to be linked to an order
// specified using the referenceID
// check if the addr is a multisig addr
scripts, err := wallet.db.WatchedScripts().GetAll()
if err != nil {
return nil, err
}
isScript := false
addrEth := common.HexToAddress(addr.String())
key := addrEth.Bytes()
redeemScript := []byte{}
for _, script := range scripts {
if bytes.Equal(key, script[:common.AddressLength]) {
isScript = true
redeemScript = script[common.AddressLength:]
break
}
}
if isScript {
ethScript, err := DeserializeEthScript(redeemScript)
if err != nil {
return nil, err
}
_, scrHash, err := GenScriptHash(ethScript)
if err != nil {
log.Error(err.Error())
}
addrScrHash := common.HexToAddress(scrHash)
actualRecipient = EthAddress{address: &addrScrHash}
hash, _, err = wallet.callAddTransaction(ethScript, &amount, feeLevel)
if err != nil {
log.Errorf("error call add txn: %v", err)
return nil, wi.ErrInsufficientFunds
}
} else {
if !wallet.balanceCheck(feeLevel, amount) {
return nil, wi.ErrInsufficientFunds
}
hash, err = wallet.Transfer(util.EnsureCorrectPrefix(addr.String()), &amount, spendAll, wallet.GetFeePerByte(feeLevel))
}
if err != nil {
return nil, err
}
// txn is pending
nonce, err := wallet.client.GetTxnNonce(util.EnsureCorrectPrefix(hash.Hex()))
if err == nil {
data, err := SerializePendingTxn(PendingTxn{
TxnID: hash,
Amount: amount.String(),
OrderID: referenceID,
Nonce: nonce,
From: wallet.address.EncodeAddress(),
To: actualRecipient.EncodeAddress(),
WithInput: false,
})
if err == nil {
err0 := wallet.db.Txns().Put(data, ut.NormalizeAddress(hash.Hex()), "0", 0, time.Now(), true)
if err0 != nil {
log.Error(err0.Error())
}
}
}
}
if err == nil {
h, err = util.CreateChainHash(hash.Hex())
if err == nil {
wallet.invokeTxnCB(h.String(), &amount)
}
}
return h, err
}
func (wallet *EthereumWallet) createTxnCallback(txID, orderID string, toAddress btcutil.Address, value big.Int, bTime time.Time, withInput bool) wi.TransactionCallback {
output := wi.TransactionOutput{
Address: toAddress,
Value: value,
Index: 1,
OrderID: orderID,
}
input := wi.TransactionInput{}
if withInput {
input = wi.TransactionInput{
OutpointHash: []byte(util.EnsureCorrectPrefix(txID)),
OutpointIndex: 1,
LinkedAddress: toAddress,
Value: value,
OrderID: orderID,
}
}
return wi.TransactionCallback{
Txid: util.EnsureCorrectPrefix(txID),
Outputs: []wi.TransactionOutput{output},
Inputs: []wi.TransactionInput{input},
Height: 1,
Timestamp: time.Now(),
Value: value,
WatchOnly: false,
BlockTime: bTime,
}
}
func (wallet *EthereumWallet) AssociateTransactionWithOrder(txnCB wi.TransactionCallback) {
for _, l := range wallet.listeners {
go l(txnCB)
}
}
// checkTxnRcpt check the txn rcpt status
func (wallet *EthereumWallet) checkTxnRcpt(hash *common.Hash, data []byte) (*common.Hash, error) {
var rcpt *types.Receipt
pTxn, err := DeserializePendingTxn(data)
if err != nil {
return nil, err
}
rcpt, err = wallet.client.TransactionReceipt(context.Background(), *hash)
if err != nil {
log.Infof("fetching txn rcpt: %v", err)
}
if rcpt != nil {
// good. so the txn has been processed but we have to account for failed
// but valid txn like some contract condition causing revert
if rcpt.Status > 0 {
// all good to update order state
chash, err := util.CreateChainHash((*hash).Hex())
if err != nil {
return nil, err
}
err = wallet.db.Txns().Delete(chash)
if err != nil {
log.Errorf("err deleting the pending txn : %v", err)
}
n := new(big.Int)
n, _ = n.SetString(pTxn.Amount, 10)
toAddr := common.HexToAddress(pTxn.To)
withInput := true
if pTxn.Amount != "0" {
toAddr = common.HexToAddress(util.EnsureCorrectPrefix(pTxn.To))
withInput = pTxn.WithInput
}
go wallet.AssociateTransactionWithOrder(
wallet.createTxnCallback(util.EnsureCorrectPrefix(hash.Hex()), pTxn.OrderID, EthAddress{&toAddr},
*n, time.Now(), withInput))
}
}
return hash, nil
}
// BumpFee - Bump the fee for the given transaction
func (wallet *EthereumWallet) BumpFee(txid chainhash.Hash) (*chainhash.Hash, error) {
return util.CreateChainHash(txid.String())
}
// EstimateFee - Calculates the estimated size of the transaction and returns the total fee for the given feePerByte
func (wallet *EthereumWallet) EstimateFee(ins []wi.TransactionInput, outs []wi.TransactionOutput, feePerByte big.Int) big.Int {
sum := big.NewInt(0)
for _, out := range outs {
gas, err := wallet.client.EstimateTxnGas(wallet.account.Address(),
common.HexToAddress(out.Address.String()), &out.Value)
if err != nil {
return *sum
}
sum.Add(sum, gas)
}
return *sum
}
func (wallet *EthereumWallet) balanceCheck(feeLevel wi.FeeLevel, amount big.Int) bool {
fee := wallet.GetFeePerByte(feeLevel)
if fee.Int64() == 0 {
return false
}
// lets check if the caller has enough balance to make the
// multisign call
requiredBalance := new(big.Int).Mul(&fee, big.NewInt(maxGasLimit))
requiredBalance = new(big.Int).Add(requiredBalance, &amount)
currentBalance, err := wallet.GetBalance()
if err != nil {
log.Error("err fetching eth wallet balance")
currentBalance = big.NewInt(0)
}
if requiredBalance.Cmp(currentBalance) > 0 {
// the wallet does not have the required balance
return false
}
return true
}
// EstimateSpendFee - Build a spend transaction for the amount and return the transaction fee
func (wallet *EthereumWallet) EstimateSpendFee(amount big.Int, feeLevel wi.FeeLevel) (big.Int, error) {
if !wallet.balanceCheck(feeLevel, amount) {
return *big.NewInt(0), wi.ErrInsufficientFunds
}
gas, err := wallet.client.EstimateGasSpend(wallet.account.Address(), &amount)
return *gas, err
}
// SweepAddress - Build and broadcast a transaction that sweeps all coins from an address. If it is a p2sh multisig, the redeemScript must be included
func (wallet *EthereumWallet) SweepAddress(utxos []wi.TransactionInput, address *btcutil.Address, key *hd.ExtendedKey, redeemScript *[]byte, feeLevel wi.FeeLevel) (*chainhash.Hash, error) {
outs := []wi.TransactionOutput{}
for i, in := range utxos {
out := wi.TransactionOutput{
Address: wallet.address,
Value: in.Value,
Index: uint32(i),
OrderID: in.OrderID,
}
outs = append(outs, out)
}
sigs, err := wallet.CreateMultisigSignature([]wi.TransactionInput{}, outs, key, *redeemScript, *big.NewInt(1))
if err != nil {
return nil, err
}
data, err := wallet.Multisign([]wi.TransactionInput{}, outs, sigs, []wi.Signature{}, *redeemScript, *big.NewInt(1), false)
if err != nil {
return nil, err
}
hash := common.BytesToHash(data)
return util.CreateChainHash(hash.Hex())
}
// ExchangeRates - return the exchangerates
func (wallet *EthereumWallet) ExchangeRates() wi.ExchangeRates {
return wallet.exchangeRates
}
func (wallet *EthereumWallet) callAddTransaction(script EthRedeemScript, value *big.Int, feeLevel wi.FeeLevel) (common.Hash, uint64, error) {
h := common.BigToHash(big.NewInt(0))
// call registry to get the deployed address for the escrow ct
fromAddress := wallet.account.Address()
nonce, err := wallet.client.PendingNonceAt(context.Background(), fromAddress)
if err != nil {
log.Fatal(err)
}
gasPrice, err := wallet.client.SuggestGasPrice(context.Background())
if err != nil {
log.Fatal(err)
}
gasPriceETHGAS := wallet.GetFeePerByte(feeLevel)
if gasPriceETHGAS.Int64() < gasPrice.Int64() {
gasPriceETHGAS = *gasPrice
}
auth := bind.NewKeyedTransactor(wallet.account.privateKey)
auth.Nonce = big.NewInt(int64(nonce))
auth.Value = value // in wei
auth.GasLimit = maxGasLimit // in units
auth.GasPrice = gasPrice
// lets check if the caller has enough balance to make the
// multisign call
if !wallet.balanceCheck(feeLevel, *big.NewInt(0)) {
// the wallet does not have the required balance
return h, nonce, wi.ErrInsufficientFunds
}
shash, _, err := GenScriptHash(script)
if err != nil {
return h, nonce, err
}
smtct, err := NewEscrow(script.MultisigAddress, wallet.client)
if err != nil {
log.Fatalf("error initilaizing contract failed: %s", err.Error())
}
var tx *types.Transaction
tx, err = smtct.AddTransaction(auth, script.Buyer, script.Seller,
script.Moderator, script.Threshold, script.Timeout, shash, script.TxnID)
if err == nil {
h = tx.Hash()
} else {
return h, 0, err
}
txns = append(txns, wi.Txn{
Txid: tx.Hash().Hex(),
Value: value.String(),
Height: int32(nonce),
Timestamp: time.Now(),
WatchOnly: false,
Bytes: tx.Data()})
return h, nonce, err
}
// GenerateMultisigScript - Generate a multisig script from public keys. If a timeout is included the returned script should be a timelocked escrow which releases using the timeoutKey.
func (wallet *EthereumWallet) GenerateMultisigScript(keys []hd.ExtendedKey, threshold int, timeout time.Duration, timeoutKey *hd.ExtendedKey) (btcutil.Address, []byte, error) {
if uint32(timeout.Hours()) > 0 && timeoutKey == nil {
return nil, nil, errors.New("timeout key must be non nil when using an escrow timeout")
}
if len(keys) < threshold {
return nil, nil, fmt.Errorf("unable to generate multisig script with "+
"%d required signatures when there are only %d public "+
"keys available", threshold, len(keys))
}
if len(keys) < 2 {
return nil, nil, fmt.Errorf("unable to generate multisig script with "+
"%d required signatures when there are only %d public "+
"keys available", threshold, len(keys))
}
var ecKeys []common.Address
for _, key := range keys {
ecKey, err := key.ECPubKey()
if err != nil {
return nil, nil, err
}
ePubkey := ecKey.ToECDSA()
ecKeys = append(ecKeys, crypto.PubkeyToAddress(*ePubkey))
}
ver, err := wallet.registry.GetRecommendedVersion(nil, "escrow")
if err != nil {
log.Fatal(err)
}