/
MaverickScraper.go
685 lines (608 loc) · 20.7 KB
/
MaverickScraper.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
package scrapers
import (
"context"
"errors"
"math"
"math/big"
"strconv"
"strings"
"sync"
"time"
"github.com/diadata-org/diadata/pkg/dia"
"github.com/diadata-org/diadata/pkg/dia/helpers"
"github.com/diadata-org/diadata/pkg/dia/helpers/ethhelper"
pairfactorycontract "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/maverick/pairfactory"
poolcontract "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/maverick/pool"
models "github.com/diadata-org/diadata/pkg/model"
"github.com/diadata-org/diadata/pkg/utils"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethclient"
)
var maverickPoolMap = make(map[string]MaverickPair)
const (
factoryContractAddressDeploymentBlockEth = uint64(17210221)
maverickWaitMilliseconds = "25"
)
type MaverickScraper struct {
WsClient *ethclient.Client
RestClient *ethclient.Client
relDB *models.RelDB
// signaling channels for session initialization and finishing
run bool
shutdown chan nothing
shutdownDone chan nothing
// error handling; to read error or closed, first acquire read lock
// only cleanup method should hold write lock
errorLock sync.RWMutex
error error
closed bool
// used to keep track of trading pairs that we subscribed to
pairScrapers map[string]*MaverickPairScraper
exchangeName string
blockchain string
poolFactoryContractAddress string
poolFactoryContractCreationBlock uint64
chanTrades chan *dia.Trade
waitTime int
// If true, only pairs given in config file are scraped. Default is false.
listenByAddress bool
fetchPoolsFromDB bool
}
type Token struct {
Address common.Address
Symbol string
Decimals uint8
Name string
}
type MaverickPair struct {
Token0 Token
Token1 Token
ForeignName string
Address common.Address
}
// NewMaverickScraper returns a new MaverickScraper for the given pair
func NewMaverickScraper(exchange dia.Exchange, scrape bool, relDB *models.RelDB) *MaverickScraper {
log.Info("NewMaverickScraper: ", exchange.Name)
var (
s *MaverickScraper
listenByAddress bool
fetchPoolsFromDB bool
err error
)
listenByAddress, err = strconv.ParseBool(utils.Getenv("LISTEN_BY_ADDRESS", ""))
if err != nil {
log.Fatal("parse LISTEN_BY_ADDRESS: ", err)
}
fetchPoolsFromDB, err = strconv.ParseBool(utils.Getenv("FETCH_POOLS_FROM_DB", ""))
if err != nil {
log.Fatal("parse FETCH_POOLS_FROM_DB: ", err)
}
switch exchange.Name {
case dia.MaverickExchange:
s = makeMaverickScraper(exchange, listenByAddress, fetchPoolsFromDB, restDialEth, wsDialEth, maverickWaitMilliseconds, factoryContractAddressDeploymentBlockEth)
//case dia.MaverickExchangeBNB:
// s = makeMaverickScraper(exchange, listenByAddress, fetchPoolsFromDB, restDialEth, wsDialEth, maverickWaitMilliseconds)
//case dia.MaverickExchangeZKSync:
// s = makeMaverickScraper(exchange, listenByAddress, fetchPoolsFromDB, restDialEth, wsDialEth, maverickWaitMilliseconds)
}
s.relDB = relDB
// Only include pools with (minimum) liquidity bigger than given env var.
liquidityThreshold, err := strconv.ParseFloat(utils.Getenv("LIQUIDITY_THRESHOLD", ""), 64)
if err != nil {
liquidityThreshold = float64(0)
log.Warnf("parse liquidity threshold: %v. Set to default %v", err, liquidityThreshold)
}
// Only include pools with (minimum) liquidity USD value bigger than given env var.
liquidityThresholdUSD, err := strconv.ParseFloat(utils.Getenv("LIQUIDITY_THRESHOLD_USD", ""), 64)
if err != nil {
liquidityThresholdUSD = float64(0)
log.Warnf("parse liquidity threshold: %v. Set to default %v", err, liquidityThresholdUSD)
}
// Fetch all pool with given liquidity threshold from database.
maverickPoolMap, err = s.makePoolMap(liquidityThreshold, liquidityThresholdUSD)
if err != nil {
log.Fatal("build poolMap: ", err)
}
if scrape {
go s.mainLoop()
}
return s
}
// makeMaverickScraper returns a maverick scraper as used in NewUniswapScraper.
func makeMaverickScraper(exchange dia.Exchange, listenByAddress bool, fetchPoolsFromDB bool, restDial string, wsDial string, waitMilliseconds string, factoryContractDeploymentBlock uint64) *MaverickScraper {
var (
restClient, wsClient *ethclient.Client
err error
s *MaverickScraper
waitTime int
)
log.Infof("Init rest and ws client for %s.", exchange.BlockChain.Name)
restClient, err = ethclient.Dial(utils.Getenv(strings.ToUpper(exchange.BlockChain.Name)+"_URI_REST", restDial))
if err != nil {
log.Fatal("init rest client: ", err)
}
wsClient, err = ethclient.Dial(utils.Getenv(strings.ToUpper(exchange.BlockChain.Name)+"_URI_WS", wsDial))
if err != nil {
log.Fatal("init ws client: ", err)
}
waitTime, err = strconv.Atoi(utils.Getenv(strings.ToUpper(exchange.BlockChain.Name)+"_WAIT_TIME", waitMilliseconds))
if err != nil {
log.Error("could not parse wait time: ", err)
waitTime = 5000
}
s = &MaverickScraper{
WsClient: wsClient,
RestClient: restClient,
shutdown: make(chan nothing),
shutdownDone: make(chan nothing),
pairScrapers: make(map[string]*MaverickPairScraper),
exchangeName: exchange.Name,
error: nil,
chanTrades: make(chan *dia.Trade),
waitTime: waitTime,
listenByAddress: listenByAddress,
fetchPoolsFromDB: fetchPoolsFromDB,
blockchain: exchange.BlockChain.Name,
poolFactoryContractAddress: exchange.Contract,
poolFactoryContractCreationBlock: factoryContractDeploymentBlock,
}
return s
}
func (s *MaverickScraper) mainLoop() {
// Import tokens which appear as base token and we need a quotation for
var err error
reverseBasetokens, err = getReverseTokensFromConfig("maverick/reverse_tokens/" + s.exchangeName + "Basetoken")
if err != nil {
log.Error("error getting tokens for which pairs should be reversed: ", err)
}
log.Info("reverse basetokens: ", reverseBasetokens)
reverseQuotetokens, err = getReverseTokensFromConfig("maverick/reverse_tokens/" + s.exchangeName + "Quotetoken")
if err != nil {
log.Error("error getting tokens for which pairs should be reversed: ", err)
}
log.Info("reverse quotetokens: ", reverseQuotetokens)
// wait for all pairs have added into s.PairScrapers
time.Sleep(4 * time.Second)
s.run = true
if s.listenByAddress || s.fetchPoolsFromDB {
var wg sync.WaitGroup
for address := range maverickPoolMap {
time.Sleep(time.Duration(s.waitTime) * time.Millisecond)
wg.Add(1)
go func(address common.Address, w *sync.WaitGroup) {
defer w.Done()
s.ListenToPair(address)
}(common.HexToAddress(address), &wg)
}
} else {
addresses, err := s.getAllPairsAddress()
if err != nil {
log.Fatal(err)
}
log.Info("Found ", len(addresses), " pairs")
log.Info("Found ", len(s.pairScrapers), " pairScrapers")
if len(s.pairScrapers) == 0 {
s.error = errors.New("maverick: No pairs to scrap provided")
log.Error(s.error.Error())
}
var wg sync.WaitGroup
for _, address := range addresses {
time.Sleep(time.Duration(s.waitTime) * time.Millisecond)
wg.Add(1)
go func(address common.Address, w *sync.WaitGroup) {
defer w.Done()
s.ListenToPair(address)
}(address, &wg)
}
wg.Wait()
}
}
// ListenToPair subscribes to a uniswap pool.
// If @byAddress is true, it listens by pool address, otherwise by index.
func (s *MaverickScraper) ListenToPair(address common.Address) {
var (
pair MaverickPair
err error
)
pair = maverickPoolMap[address.Hex()]
if !s.listenByAddress && !s.fetchPoolsFromDB {
//Get pool info from on-chain. @poolMap is empty.
pair, err = s.getPairByAddress(address)
if err != nil {
log.Error("error fetching pair: ", err)
return
}
} else {
// Relevant pool info is retrieved from @poolMap.
pair = maverickPoolMap[address.Hex()]
}
if len(pair.Token0.Symbol) < 2 || len(pair.Token1.Symbol) < 2 {
log.Info("skip pair: ", pair.ForeignName)
return
}
if helpers.AddressIsBlacklisted(pair.Token0.Address) || helpers.AddressIsBlacklisted(pair.Token1.Address) {
log.Info("skip pair ", pair.ForeignName, ", address is blacklisted")
return
}
if helpers.PoolIsBlacklisted(pair.Address) {
log.Info("skip blacklisted pool ", pair.Address)
return
}
log.Info("add pair scraper for: ", pair.ForeignName, " with address ", pair.Address.Hex())
sink, err := s.GetSwapsChannel(pair.Address)
if err != nil {
log.Error("error fetching swaps channel: ", err)
}
go func() {
for {
rawSwap, ok := <-sink
if ok {
price, volume := getPriceAndVolumeFromRawSwapData(rawSwap, pair)
token0 := dia.Asset{
Address: pair.Token0.Address.Hex(),
Symbol: pair.Token0.Symbol,
Name: pair.Token0.Name,
Decimals: pair.Token0.Decimals,
Blockchain: Exchanges[s.exchangeName].BlockChain.Name,
}
token1 := dia.Asset{
Address: pair.Token1.Address.Hex(),
Symbol: pair.Token1.Symbol,
Name: pair.Token1.Name,
Decimals: pair.Token1.Decimals,
Blockchain: Exchanges[s.exchangeName].BlockChain.Name,
}
t := &dia.Trade{
Symbol: pair.Token0.Symbol,
Pair: pair.ForeignName,
Price: price,
Volume: volume,
BaseToken: token1,
QuoteToken: token0,
Time: time.Unix(time.Now().Unix(), 0),
PoolAddress: rawSwap.Raw.Address.Hex(),
ForeignTradeID: rawSwap.Raw.TxHash.Hex(),
Source: s.exchangeName,
VerifiedPair: true,
}
// TO DO: Refactor approach for reversing pairs.
switch {
case utils.Contains(reverseBasetokens, pair.Token1.Address.Hex()):
// If we need quotation of a base token, reverse pair
tSwapped, err := dia.SwapTrade(*t)
if err == nil {
t = &tSwapped
}
case utils.Contains(reverseQuotetokens, pair.Token0.Address.Hex()):
// If we don't need quotation of quote token, reverse pair.
tSwapped, err := dia.SwapTrade(*t)
if err == nil {
t = &tSwapped
}
}
if price > 0 {
log.Info("tx hash: ", rawSwap.Raw.TxHash.Hex())
log.Infof("Got trade at time %v - symbol: %s, pair: %s, price: %v, volume:%v", t.Time, t.Symbol, t.Pair, t.Price, t.Volume)
s.chanTrades <- t
}
}
}
}()
}
func (s *MaverickScraper) getPairByAddress(pairAddress common.Address) (MaverickPair, error) {
var (
poolContractInstance *poolcontract.PoolCaller
token0 dia.Asset
token1 dia.Asset
)
connection := s.RestClient
poolContractInstance, err := poolcontract.NewPoolCaller(pairAddress, connection)
if err != nil {
log.Error(err)
return MaverickPair{}, err
}
// Getting tokens from pair
address0, _ := poolContractInstance.TokenA(&bind.CallOpts{})
address1, _ := poolContractInstance.TokenB(&bind.CallOpts{})
// Only fetch assets from on-chain in case they are not in our DB.
token0, err = s.relDB.GetAsset(address0.Hex(), s.blockchain)
if err != nil {
token0, err = ethhelper.ETHAddressToAsset(address0, s.RestClient, s.blockchain)
if err != nil {
return MaverickPair{}, err
}
}
token1, err = s.relDB.GetAsset(address1.Hex(), s.blockchain)
if err != nil {
token1, err = ethhelper.ETHAddressToAsset(address1, s.RestClient, s.blockchain)
if err != nil {
return MaverickPair{}, err
}
}
pair := MaverickPair{
Token0: Token{
Address: common.HexToAddress(token0.Address),
Symbol: token0.Symbol,
Decimals: token0.Decimals,
Name: token0.Name,
},
Token1: Token{
Address: common.HexToAddress(token1.Address),
Symbol: token1.Symbol,
Decimals: token1.Decimals,
Name: token1.Name,
},
ForeignName: token0.Symbol + "-" + token1.Symbol,
Address: pairAddress,
}
return pair, nil
}
// getVolumeAndPriceFromRawSwapData returns price, volume and sell/buy information of @swap
func getPriceAndVolumeFromRawSwapData(swap *poolcontract.PoolSwap, pair MaverickPair) (price, volume float64) {
decimals0 := int(pair.Token0.Decimals)
decimals1 := int(pair.Token1.Decimals)
if swap.TokenAIn {
amount0In, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.AmountIn), new(big.Float).SetFloat64(math.Pow10(decimals0))).Float64()
amount1Out, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.AmountOut), new(big.Float).SetFloat64(math.Pow10(decimals1))).Float64()
volume = -amount0In
price = amount1Out / amount0In
return
}
amount1In, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.AmountIn), new(big.Float).SetFloat64(math.Pow10(decimals1))).Float64()
amount0Out, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.AmountOut), new(big.Float).SetFloat64(math.Pow10(decimals0))).Float64()
volume = amount0Out
price = amount1In / amount0Out
return
}
// makePoolMap returns a map with pool addresses as keys and the underlying MaverickPool as values.
// If s.listenByAddress is true, it only loads the corresponding assets from the list.
func (s *MaverickScraper) makePoolMap(liquiThreshold float64, liquidityThresholdUSD float64) (map[string]MaverickPair, error) {
pm := make(map[string]MaverickPair)
var (
pools []dia.Pool
err error
)
if s.listenByAddress {
// Only load pool info for addresses from json file.
poolAddresses, errAddr := getAddressesFromConfig("maverick/subscribe_pools/" + s.exchangeName)
if errAddr != nil {
log.Error("fetch pool addresses from config file: ", errAddr)
}
for _, address := range poolAddresses {
pool, errPool := s.relDB.GetPoolByAddress(Exchanges[s.exchangeName].BlockChain.Name, address.Hex())
if errPool != nil {
log.Fatalf("Get pool with address %s: %v", address.Hex(), errPool)
}
pools = append(pools, pool)
}
} else if s.fetchPoolsFromDB {
// Load all pools above liqui threshold.
pools, err = s.relDB.GetAllPoolsExchange(s.exchangeName, liquiThreshold)
if err != nil {
return pm, err
}
} else {
// Pool info will be fetched from on-chain and poolMap is not needed.
return pm, nil
}
log.Info("Found ", len(pools), " pools.")
log.Info("make pool map...")
lowerBoundCount := 0
for _, pool := range pools {
if len(pool.Assetvolumes) != 2 {
log.Warn("not enough assets in pool with address: ", pool.Address)
continue
}
liquidity, lowerBound := pool.GetPoolLiquidityUSD()
// Discard pool if complete USD liquidity is below threshold.
if !lowerBound && liquidity < liquidityThresholdUSD {
continue
}
if lowerBound {
lowerBoundCount++
}
maverickPair := MaverickPair{
Address: common.HexToAddress(pool.Address),
}
if pool.Assetvolumes[0].Index == 0 {
maverickPair.Token0 = asset2MaverickAsset(pool.Assetvolumes[0].Asset)
maverickPair.Token1 = asset2MaverickAsset(pool.Assetvolumes[1].Asset)
} else {
maverickPair.Token0 = asset2MaverickAsset(pool.Assetvolumes[1].Asset)
maverickPair.Token1 = asset2MaverickAsset(pool.Assetvolumes[0].Asset)
}
maverickPair.ForeignName = maverickPair.Token0.Symbol + "-" + maverickPair.Token1.Symbol
pm[pool.Address] = maverickPair
}
log.Infof("found %v subscribable pools.", len(pm))
log.Infof("%v pools with lowerBound=true.", lowerBoundCount)
return pm, err
}
func asset2MaverickAsset(asset dia.Asset) Token {
return Token{
Address: common.HexToAddress(asset.Address),
Decimals: asset.Decimals,
Symbol: asset.Symbol,
Name: asset.Name,
}
}
// GetSwapsChannel returns a channel for swaps of the pair with address @pairAddress
func (s *MaverickScraper) GetSwapsChannel(pairAddress common.Address) (chan *poolcontract.PoolSwap, error) {
sink := make(chan *poolcontract.PoolSwap)
var poolFiltererContract *poolcontract.PoolFilterer
poolFiltererContract, err := poolcontract.NewPoolFilterer(pairAddress, s.WsClient)
if err != nil {
log.Fatal(err)
}
_, err = poolFiltererContract.WatchSwap(&bind.WatchOpts{}, sink)
if err != nil {
log.Error("error in get swaps channel: ", err)
}
return sink, nil
}
func (s *MaverickScraper) getAllPairsAddress() ([]common.Address, error) {
pools := make([]common.Address, 0)
var factoryContractInstance *pairfactorycontract.PairfactoryFilterer
factoryContractInstance, err := pairfactorycontract.NewPairfactoryFilterer(common.HexToAddress(s.poolFactoryContractAddress), s.RestClient)
if err != nil {
log.Error(err)
return pools, err
}
currBlock, err := s.RestClient.BlockNumber(context.Background())
if err != nil {
return nil, err
}
var offset uint64 = 2500
startBlock := s.poolFactoryContractCreationBlock
var endBlock = startBlock + offset
for {
if endBlock > currBlock {
endBlock = currBlock
}
log.Infof("startblock - endblock: %v --- %v ", startBlock, endBlock)
it, err := factoryContractInstance.FilterPoolCreated(
&bind.FilterOpts{
Start: startBlock,
End: &endBlock,
})
if err != nil {
log.Error(err)
//return pools, err
if endBlock == currBlock {
break
}
startBlock = endBlock + 1
endBlock = endBlock + offset
continue
}
for it.Next() {
pools = append(pools, it.Event.PoolAddress)
}
if err := it.Close(); err != nil {
log.Warn("closing iterator: ", it)
}
if endBlock == currBlock {
break
}
startBlock = endBlock + 1
endBlock = endBlock + offset
}
return pools, err
}
func (s *MaverickScraper) getAllPairs() ([]MaverickPair, error) {
pairs := make([]MaverickPair, 0)
addresses, err := s.getAllPairsAddress()
if err != nil {
log.Fatal(err)
}
for _, address := range addresses {
pair, err := s.getPairByAddress(address)
if err != nil {
log.Warn(err)
continue
}
pairs = append(pairs, pair)
}
return pairs, nil
}
// Close closes any existing API connections, as well as channels of
// PairScrapers from calls to ScrapePair
func (s *MaverickScraper) Close() error {
if s.closed {
return errors.New("UniswapScraper: Already closed")
}
s.WsClient.Close()
s.RestClient.Close()
close(s.shutdown)
<-s.shutdownDone
s.errorLock.RLock()
defer s.errorLock.RUnlock()
return s.error
}
// ScrapePair returns a PairScraper that can be used to get trades for a single pair from
// this APIScraper
func (s *MaverickScraper) ScrapePair(pair dia.ExchangePair) (PairScraper, error) {
s.errorLock.RLock()
defer s.errorLock.RUnlock()
if s.error != nil {
return nil, s.error
}
if s.closed {
return nil, errors.New("UniswapScraper: Call ScrapePair on closed scraper")
}
ps := &MaverickPairScraper{
parent: s,
pair: pair,
}
s.pairScrapers[pair.ForeignName] = ps
return ps, nil
}
// FetchAvailablePairs returns a list with all available trade pairs as dia.ExchangePair for the pairDiscorvery service
func (s *MaverickScraper) FetchAvailablePairs() (pairs []dia.ExchangePair, err error) {
time.Sleep(100 * time.Millisecond)
maverickPairs, err := s.getAllPairs()
if err != nil {
return
}
for _, pair := range maverickPairs {
quotetoken := dia.Asset{
Symbol: pair.Token0.Symbol,
Name: pair.Token0.Name,
Address: pair.Token0.Address.Hex(),
Decimals: pair.Token0.Decimals,
Blockchain: Exchanges[s.exchangeName].BlockChain.Name,
}
basetoken := dia.Asset{
Symbol: pair.Token1.Symbol,
Name: pair.Token1.Name,
Address: pair.Token1.Address.Hex(),
Decimals: pair.Token1.Decimals,
Blockchain: Exchanges[s.exchangeName].BlockChain.Name,
}
pairToNormalise := dia.ExchangePair{
Symbol: pair.Token0.Symbol,
ForeignName: pair.ForeignName,
Exchange: s.exchangeName,
Verified: true,
UnderlyingPair: dia.Pair{BaseToken: basetoken, QuoteToken: quotetoken},
}
normalizedPair, _ := s.NormalizePair(pairToNormalise)
pairs = append(pairs, normalizedPair)
}
return
}
func (s *MaverickScraper) NormalizePair(pair dia.ExchangePair) (dia.ExchangePair, error) {
return pair, nil
}
// FillSymbolData is not used by DEX scrapers.
func (s *MaverickScraper) FillSymbolData(symbol string) (dia.Asset, error) {
return dia.Asset{}, nil
}
// MaverickPairScraper implements PairScraper for Uniswap
type MaverickPairScraper struct {
parent *MaverickScraper
pair dia.ExchangePair
closed bool
}
// Close stops listening for trades of the pair associated with s
func (ps *MaverickPairScraper) Close() error {
ps.closed = true
return nil
}
// Channel returns a channel that can be used to receive trades
func (s *MaverickScraper) Channel() chan *dia.Trade {
return s.chanTrades
}
// Error returns an error when the channel Channel() is closed
// and nil otherwise
func (ps *MaverickPairScraper) Error() error {
s := ps.parent
s.errorLock.RLock()
defer s.errorLock.RUnlock()
return s.error
}
// Pair returns the pair this scraper is subscribed to
func (ps *MaverickPairScraper) Pair() dia.ExchangePair {
return ps.pair
}