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BancorScraper.go
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BancorScraper.go
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package scrapers
import (
"encoding/json"
"errors"
"fmt"
"math"
"math/big"
"strings"
"sync"
"time"
ConverterRegistry "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor"
"github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor/BancorNetwork"
"github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor/ConverterTypeFour"
ConvertertypeOne "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor/ConverterTypeOne"
"github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor/ConverterTypeThree"
"github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/bancor/ConverterTypeZero"
uniswapcontract "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/uniswap"
"github.com/diadata-org/diadata/pkg/dia"
"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"
)
type BancorPool struct {
Reserves []struct {
DltID string `json:"dlt_id"`
Symbol string `json:"symbol"`
Name string `json:"name"`
Balance struct {
Usd string `json:"usd"`
} `json:"balance"`
Weight int `json:"weight"`
Price struct {
Usd string `json:"usd"`
} `json:"price"`
Price24HAgo struct {
Usd string `json:"usd"`
} `json:"price_24h_ago"`
Volume24H struct {
Usd string `json:"usd"`
Base string `json:"base"`
} `json:"volume_24h"`
} `json:"reserves"`
DltType string `json:"dlt_type"`
DltID string `json:"dlt_id"`
Type int `json:"type"`
Version int `json:"version"`
Symbol string `json:"symbol"`
Name string `json:"name"`
Supply string `json:"supply"`
ConverterDltID string `json:"converter_dlt_id"`
ConversionFee string `json:"conversion_fee"`
Liquidity struct {
Usd string `json:"usd"`
} `json:"liquidity"`
Volume24H struct {
Usd string `json:"usd"`
} `json:"volume_24h"`
Fees24H struct {
Usd string `json:"usd"`
} `json:"fees_24h"`
}
type BancorPools struct {
Data []BancorPool `json:"data"`
Timestamp struct {
Ethereum struct {
Block int `json:"block"`
Timestamp int64 `json:"timestamp"`
} `json:"ethereum"`
} `json:"timestamp"`
}
type BancorSwap struct {
Pair dia.ExchangePair
FromAmount float64
ToAmount float64
ID string
Timestamp int64
}
type BancorScraper struct {
WsClient *ethclient.Client
RestClient *ethclient.Client
exchangeName string
// channels to signal events
run bool
initDone chan nothing
shutdown chan nothing
shutdownDone chan nothing
errorLock sync.RWMutex
error error
closed bool
pairScrapers map[string]*BancorPairScraper
productPairIds map[string]int
chanTrades chan *dia.Trade
}
func NewBancorScraper(exchange dia.Exchange, scrape bool) *BancorScraper {
var wsClient, restClient *ethclient.Client
var err error
restClient, err = ethclient.Dial(utils.Getenv("ETH_URI_REST", restDialEth))
if err != nil {
log.Fatal("init rest client: ", err)
}
wsClient, err = ethclient.Dial(utils.Getenv("ETH_URI_WS", wsDialEth))
if err != nil {
log.Fatal("init ws client: ", err)
}
scraper := &BancorScraper{
exchangeName: exchange.Name,
WsClient: wsClient,
RestClient: restClient,
initDone: make(chan nothing),
shutdown: make(chan nothing),
shutdownDone: make(chan nothing),
productPairIds: make(map[string]int),
pairScrapers: make(map[string]*BancorPairScraper),
chanTrades: make(chan *dia.Trade),
}
if scrape {
go scraper.mainLoop()
}
return scraper
}
func (scraper *BancorScraper) mainLoop() {
scraper.GetpoolAddress()
sink, err := scraper.GetConversion()
if err != nil {
log.Errorln("Error GetConversion", err)
}
go func() {
for {
rawSwap := <-sink
revRawSwap := reverseBNTSwap(*rawSwap)
var address []common.Address
swap, err := scraper.normalizeSwap(revRawSwap)
if err != nil {
log.Error("error normalizeSwap: ", err)
}
price, volume := scraper.getSwapData(swap)
address = append(address, revRawSwap.FromToken)
address = append(address, revRawSwap.ToToken)
pair := scraper.GetPair(address)
trade := &dia.Trade{
Symbol: pair.Symbol,
Pair: pair.ForeignName,
Price: price,
Volume: volume,
Time: time.Now(),
ForeignTradeID: revRawSwap.Raw.TxHash.String(),
Source: scraper.exchangeName,
BaseToken: pair.UnderlyingPair.BaseToken,
QuoteToken: pair.UnderlyingPair.QuoteToken,
VerifiedPair: true,
}
log.Info("Got Trade: ", trade)
scraper.chanTrades <- trade
}
}()
if scraper.error == nil {
scraper.error = errors.New("Main loop terminated by Close().")
}
scraper.cleanup(nil)
}
// Reverse swap involving BNT such that pair is always XXX-BNT.
func reverseBNTSwap(rawSwap BancorNetwork.BancorNetworkConversion) BancorNetwork.BancorNetworkConversion {
var revRawSwap BancorNetwork.BancorNetworkConversion
fmt.Println("raw swap ToToken: ", rawSwap.ToToken.Hex())
if rawSwap.FromToken.Hex() == "0x1F573D6Fb3F13d689FF844B4cE37794d79a7FF1C" {
revRawSwap.ToAmount = rawSwap.FromAmount
revRawSwap.FromAmount = rawSwap.ToAmount
revRawSwap.FromToken = rawSwap.ToToken
revRawSwap.ToToken = rawSwap.FromToken
revRawSwap.Raw = rawSwap.Raw
return revRawSwap
}
return rawSwap
}
func (scraper *BancorScraper) GetpoolAddress() {
// Get All Anchors
converTerRegistryAddress := common.HexToAddress("0xC0205e203F423Bcd8B2a4d6f8C8A154b0Aa60F19")
converter, err := ConverterRegistry.NewConverterRegistryCaller(converTerRegistryAddress, scraper.RestClient)
if err != nil {
log.Errorln("Error Getting Anchors", err)
}
_, err = converter.GetAnchors(&bind.CallOpts{})
if err != nil {
log.Errorln("Error Getting Anchors", err)
}
}
func (scraper *BancorScraper) GetConversion() (chan *BancorNetwork.BancorNetworkConversion, error) {
sink := make(chan *BancorNetwork.BancorNetworkConversion)
var conversionFiltererContract *BancorNetwork.BancorNetworkFilterer
address := common.HexToAddress("0x2F9EC37d6CcFFf1caB21733BdaDEdE11c823cCB0") // bancor Network
conversionFiltererContract, err := BancorNetwork.NewBancorNetworkFilterer(address, scraper.WsClient)
if err != nil {
return nil, err
}
subs, err := conversionFiltererContract.WatchConversion(&bind.WatchOpts{}, sink, []common.Address{}, []common.Address{}, []common.Address{})
if err != nil {
log.Error("error in get swaps channel: ", err)
}
log.Infoln("Subscribed", subs)
return sink, nil
}
// normalizeUniswapSwap takes a swap as returned by the swap contract's channel and converts it to a UniswapSwap type
func (scrapper *BancorScraper) normalizeSwap(swap BancorNetwork.BancorNetworkConversion) (BancorSwap, error) {
var normalizedSwap BancorSwap
if swap.FromToken.Hex() == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
amount0, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.FromAmount), new(big.Float).SetFloat64(math.Pow10(18))).Float64()
normalizedSwap.FromAmount = amount0
} else {
fromToken, err := uniswapcontract.NewIERC20(swap.FromToken, scrapper.RestClient)
if err != nil {
return normalizedSwap, err
}
fromTokenDecimal, err := fromToken.Decimals(&bind.CallOpts{})
if err != nil {
return normalizedSwap, err
}
decimals0 := int(fromTokenDecimal)
amount0, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.FromAmount), new(big.Float).SetFloat64(math.Pow10(decimals0))).Float64()
normalizedSwap.FromAmount = amount0
}
if swap.ToToken.Hex() == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
amount1, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.ToAmount), new(big.Float).SetFloat64(math.Pow10(18))).Float64()
normalizedSwap.ToAmount = amount1
} else {
toToken, err := uniswapcontract.NewIERC20(swap.ToToken, scrapper.RestClient)
if err != nil {
return normalizedSwap, err
}
toTokenDecimal, err := toToken.Decimals(&bind.CallOpts{})
if err != nil {
return normalizedSwap, err
}
decimals1 := int(toTokenDecimal)
amount1, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(swap.ToAmount), new(big.Float).SetFloat64(math.Pow10(decimals1))).Float64()
normalizedSwap.ToAmount = amount1
}
pair := scrapper.GetPair([]common.Address{swap.ToToken, swap.FromToken})
pair, _ = scrapper.NormalizePair(pair)
normalizedSwap.Pair = pair
normalizedSwap.ID = swap.Raw.TxHash.Hex()
normalizedSwap.Timestamp = time.Now().Unix()
return normalizedSwap, nil
}
func (scrapper *BancorScraper) getSwapData(swap BancorSwap) (price float64, volume float64) {
volume = swap.FromAmount
price = swap.ToAmount / swap.FromAmount
return
}
func (scraper *BancorScraper) NormalizePair(pair dia.ExchangePair) (dia.ExchangePair, error) {
if pair.UnderlyingPair.BaseToken.Address == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
pair.UnderlyingPair.BaseToken.Address = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
}
if pair.UnderlyingPair.QuoteToken.Address == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
pair.UnderlyingPair.QuoteToken.Address = "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"
}
return pair, nil
}
func (scraper *BancorScraper) ConverterTypeZero(address common.Address) (tokenAddress []common.Address, err error) {
contract, err := ConverterTypeZero.NewConverterTypeZeroCaller(address, scraper.RestClient)
if err != nil {
return
}
tokenCount, err := contract.ConnectorTokenCount(&bind.CallOpts{})
if err != nil {
return
}
if tokenCount == 2 {
token1, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(1))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token1)
token2, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(0))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token2)
}
return
}
func (scraper *BancorScraper) ConverterTypeOne(address common.Address) (tokenAddress []common.Address, err error) {
contract, err := ConvertertypeOne.NewConvertertypeOne(address, scraper.RestClient)
if err != nil {
return
}
tokenCount, err := contract.ConnectorTokenCount(&bind.CallOpts{})
if err != nil {
return
}
if tokenCount == 2 {
token1, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(1))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token1)
token2, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(0))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token2)
}
return
}
func (scraper *BancorScraper) ConverterTypeThree(address common.Address) (tokenAddress []common.Address, err error) {
contract, err := ConverterTypeThree.NewConverterTypeThree(address, scraper.RestClient)
if err != nil {
return
}
tokenCount, err := contract.ConnectorTokenCount(&bind.CallOpts{})
if err != nil {
return
}
log.Println("tokenCount", tokenCount)
if tokenCount == 2 {
token1, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(1))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token1)
token2, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(0))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token2)
}
return
}
func (scraper *BancorScraper) ConverterTypeFour(address common.Address) (tokenAddress []common.Address, err error) {
contract, err := ConverterTypeFour.NewConverterTypeFour(address, scraper.RestClient)
if err != nil {
return
}
tokenCount, err := contract.ConnectorTokenCount(&bind.CallOpts{})
if err != nil {
return
}
if tokenCount == 2 {
token1, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(1))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token1)
token2, err := contract.ConnectorTokens(&bind.CallOpts{}, big.NewInt(0))
if err != nil {
log.Println("Error", err)
}
tokenAddress = append(tokenAddress, token2)
}
return
}
func (scraper *BancorScraper) FillSymbolData(symbol string) (dia.Asset, error) {
return dia.Asset{Symbol: symbol}, nil
}
func (scraper *BancorScraper) FetchAvailablePairs() (pairs []dia.ExchangePair, err error) {
pools, err := scraper.readPools()
if err != nil {
log.Error("Couldn't obtain Bancor product ids:", err)
}
for _, pool := range pools {
var address []common.Address
switch pool.Type {
case 0:
{
address, err = scraper.ConverterTypeZero(common.HexToAddress(pool.ConverterDltID))
if err != nil {
log.Errorln("Error getting Address", err)
}
}
case 1:
{
address, err = scraper.ConverterTypeOne(common.HexToAddress(pool.ConverterDltID))
if err != nil {
log.Errorln("Error getting Address", err)
}
}
case 3:
{
address, err = scraper.ConverterTypeThree(common.HexToAddress(pool.ConverterDltID))
if err != nil {
log.Errorln("Error getting Address", err)
}
}
case 4:
{
address, err = scraper.ConverterTypeFour(common.HexToAddress(pool.ConverterDltID))
if err != nil {
log.Errorln("Error getting Address", err)
}
}
}
pair := scraper.GetPair(address)
if pair.Symbol != "" && strings.Split(pair.ForeignName, "-")[1] != "" {
log.Println("found pair: ", pair)
pairs = append(pairs, pair)
}
}
return
}
func (scraper *BancorScraper) GetPair(address []common.Address) dia.ExchangePair {
var (
symbol0 string
symbol1 string
)
token0, err := uniswapcontract.NewIERC20Caller(address[0], scraper.RestClient)
if err != nil {
log.Errorln("Error Getting token 0 ", err)
}
token1, err := uniswapcontract.NewIERC20Caller(address[1], scraper.RestClient)
if err != nil {
log.Errorln("Error Getting token 1 ", err)
}
if address[0].Hex() == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
address[0] = common.HexToAddress("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2")
symbol0 = "WETH"
} else {
symbol0, err = token0.Symbol(&bind.CallOpts{})
if err != nil {
log.Error(err)
}
}
if address[1].Hex() == "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE" {
address[0] = common.HexToAddress("0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2")
symbol1 = "WETH"
} else {
symbol1, err = token1.Symbol(&bind.CallOpts{})
if err != nil {
log.Error(err)
}
}
basetoken := dia.Asset{
Symbol: symbol1,
Address: address[1].Hex(),
Blockchain: dia.ETHEREUM,
}
quotetoken := dia.Asset{
Symbol: symbol0,
Address: address[0].Hex(),
Blockchain: dia.ETHEREUM,
}
return dia.ExchangePair{
ForeignName: symbol0 + "-" + symbol1,
Symbol: symbol0,
Exchange: scraper.exchangeName,
UnderlyingPair: dia.Pair{BaseToken: basetoken, QuoteToken: quotetoken},
}
}
func (scraper *BancorScraper) readPools() ([]BancorPool, error) {
var bpools BancorPools
pairs, _, err := utils.GetRequest("https://api-v2.bancor.network/pools")
if err != nil {
return nil, err
}
err = json.Unmarshal(pairs, &bpools)
if err != nil {
log.Error("Error reading json", err)
}
return bpools.Data, nil
}
func (scraper *BancorScraper) ScrapePair(pair dia.ExchangePair) (PairScraper, error) {
scraper.errorLock.RLock()
defer scraper.errorLock.RUnlock()
if scraper.error != nil {
return nil, scraper.error
}
if scraper.closed {
return nil, errors.New("BancorScraper is closed")
}
pairScraper := &BancorPairScraper{
parent: scraper,
pair: pair,
}
scraper.pairScrapers[pair.ForeignName] = pairScraper
return pairScraper, nil
}
func (scraper *BancorScraper) cleanup(err error) {
scraper.errorLock.Lock()
defer scraper.errorLock.Unlock()
if err != nil {
scraper.error = err
}
scraper.closed = true
close(scraper.shutdownDone)
}
func (scraper *BancorScraper) Close() error {
// close the pair scraper channels
scraper.run = false
for _, pairScraper := range scraper.pairScrapers {
pairScraper.closed = true
}
close(scraper.shutdown)
<-scraper.shutdownDone
return nil
}
type BancorPairScraper struct {
parent *BancorScraper
pair dia.ExchangePair
closed bool
}
func (pairScraper *BancorPairScraper) Pair() dia.ExchangePair {
return pairScraper.pair
}
func (scraper *BancorScraper) Channel() chan *dia.Trade {
return scraper.chanTrades
}
func (pairScraper *BancorPairScraper) Error() error {
s := pairScraper.parent
s.errorLock.RLock()
defer s.errorLock.RUnlock()
return s.error
}
func (pairScraper *BancorPairScraper) Close() error {
pairScraper.parent.errorLock.RLock()
defer pairScraper.parent.errorLock.RUnlock()
pairScraper.closed = true
return nil
}