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AnyswapEthScraper.go
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AnyswapEthScraper.go
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package scrapers
import (
"encoding/json"
"errors"
"math"
"math/big"
"strconv"
"strings"
"sync"
"time"
anyswap "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/anyswap"
models "github.com/diadata-org/diadata/pkg/model"
"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"
)
var (
// anyswapEthereumContractAddress = "0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f"
anyswapAPIURL = "https://bridgeapi.anyswap.exchange/v3/serverinfoV3?chainId=all&version=STABLEV3"
// maps chainID to chain name.
// TO DO: import from postgres.
chainMap map[string]string
// maps chainID+address to the corresponding dia.Asset.
assetMap map[string]dia.Asset
)
const (
anyswapWaitMilliseconds = "200"
)
type AnyswapToken struct {
Address common.Address
Symbol string
Decimals uint8
Name string
}
type AnyswapPair struct {
Token0 UniswapToken
Token1 UniswapToken
ForeignName string
Address common.Address
}
type AnyswapSwap struct {
ID string
Timestamp int64
Pair UniswapPair
Amount0In float64
Amount0Out float64
Amount1In float64
Amount1Out float64
}
type AnyswapScraper struct {
WsClientMap map[string]*ethclient.Client
RestClientMap map[string]*ethclient.Client
db *models.RelDB
// signaling channels for session initialization and finishing
//initDone chan nothing
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]*AnyswapPairScraper
exchangeName string
chanTrades chan *dia.Trade
waitTime int
anyswapAssetInfo map[string]map[string]interface{}
}
// NewUniswapScraper returns a new UniswapScraper for the given pair
func NewAnyswapScraper(exchange dia.Exchange, scrape bool, relDB *models.RelDB) *AnyswapScraper {
log.Info("NewUniswapScraper: ", exchange.Name)
var wsClientMap, restClientMap map[string]*ethclient.Client
var waitTime int
var err error
assetMap = make(map[string]dia.Asset)
switch exchange.Name {
case dia.AnyswapExchange:
exchangeFactoryContractAddress = exchange.Contract
waitTimeString := utils.Getenv("UNISWAP_WAIT_TIME", anyswapWaitMilliseconds)
waitTime, err = strconv.Atoi(waitTimeString)
if err != nil {
log.Error("could not parse wait time: ", err)
waitTime = 100
}
}
chainMap = make(map[string]string)
chainMap["1"] = dia.ETHEREUM
chainMap["56"] = dia.BINANCESMARTCHAIN
chainMap["137"] = dia.POLYGON
chainMap["250"] = dia.FANTOM
chainMap["1284"] = dia.MOONBEAM
chainMap["1285"] = dia.MOONRIVER
chainMap["42161"] = dia.ARBITRUM
chainMap["43114"] = dia.AVALANCHE
restClientMap, wsClientMap, err = getClientMaps()
if err != nil {
log.Fatal("get client map: ", err)
}
allAssetsAllChains, err := fetchEndpoint(anyswapAPIURL)
if err != nil {
log.Fatal("fetch asset info from anyswap API endpoint: ", err)
}
s := &AnyswapScraper{
RestClientMap: restClientMap,
WsClientMap: wsClientMap,
db: relDB,
shutdown: make(chan nothing),
shutdownDone: make(chan nothing),
pairScrapers: make(map[string]*AnyswapPairScraper),
exchangeName: exchange.Name,
error: nil,
chanTrades: make(chan *dia.Trade),
waitTime: waitTime,
anyswapAssetInfo: allAssetsAllChains,
}
if scrape {
go s.mainLoop()
}
return s
}
// runs in a goroutine until s is closed
func (s *AnyswapScraper) mainLoop() {
// wait for all pairs have added into s.PairScrapers
time.Sleep(4 * time.Second)
s.run = true
var wg sync.WaitGroup
for key := range chainMap {
time.Sleep(time.Duration(s.waitTime) * time.Millisecond)
wg.Add(1)
go func(chainID string, w *sync.WaitGroup) {
defer w.Done()
s.ListenToChainOut(chainID)
}(key, &wg)
}
wg.Wait()
}
// ListenToChainOut screens swaps out of the chain with @chainID to any other chain
// offered by Anyswap.
func (s *AnyswapScraper) ListenToChainOut(chainID string) {
log.Info("listen to chain: ", chainMap[chainID])
var err error
// Fetch all addresses that can be bridged on chain with @chainID.
addresses, err := getAddressesByChain(chainID)
if err != nil {
log.Error("")
}
// Switch from anyToken to underlying token.
anyTokenMap, err := getAnyTokenMap()
if err != nil {
log.Error("get anyToken map: ", err)
}
// Listen to swaps out of current chain.
sink, err := s.GetSwapOutChannel(addresses, chainID)
if err != nil {
log.Error("error fetching swaps channel: ", err)
}
go func() {
for {
rawSwap, ok := <-sink
if ok {
swap, err := s.processSwap(*rawSwap, anyTokenMap)
if err != nil {
log.Error("process swap: ", err)
} else {
log.Infof("got swap -- %v", swap)
s.chanTrades <- &swap
}
}
}
}()
}
// processSwap returns a dia.Trade object from a rawSwap as emitted in LogAnySwapOut.
func (s *AnyswapScraper) processSwap(rawSwap anyswap.AnyswapV4RouterLogAnySwapOut, anyTokenMap map[string]string) (trade dia.Trade, err error) {
// Get Basetoken
fromChainID := rawSwap.FromChainID.String()
basetokenaddress := rawSwap.Token.Hex()
// If outToken is an anyToken, switch to the underlying asset.
if underlyingToken, ok := anyTokenMap[fromChainID+"-"+basetokenaddress]; ok {
basetokenaddress = underlyingToken
}
if basetoken, ok := assetMap[fromChainID+basetokenaddress]; ok {
trade.BaseToken = basetoken
} else {
basetoken, err = s.db.GetAsset(common.HexToAddress(basetokenaddress).Hex(), chainMap[fromChainID])
if err != nil {
log.Errorf("get base asset %s on chainID %v: %v", basetokenaddress, rawSwap.FromChainID, err)
return
}
trade.BaseToken = basetoken
assetMap[fromChainID+basetokenaddress] = basetoken
}
// Get Quotetoken
toChainID := rawSwap.ToChainID.String()
toAddress := s.anyswapAssetInfo[fromChainID][strings.ToLower(basetokenaddress)].(map[string]interface{})["destChains"].(map[string]interface{})[toChainID].(map[string]interface{})["address"].(string)
if quotetoken, ok := assetMap[toChainID+toAddress]; ok {
trade.QuoteToken = quotetoken
} else {
quotetoken, err = s.db.GetAsset(common.HexToAddress(toAddress).Hex(), chainMap[toChainID])
if err != nil {
log.Errorf("get quote asset %s on chainID %s: %v", toAddress, rawSwap.ToChainID, err)
return
}
trade.QuoteToken = quotetoken
assetMap[fromChainID+toAddress] = quotetoken
}
trade.Symbol = trade.QuoteToken.Symbol
trade.Pair = trade.QuoteToken.Symbol + "-" + trade.BaseToken.Symbol
trade.Price = float64(1)
trade.Volume, _ = new(big.Float).Quo(big.NewFloat(0).SetInt(rawSwap.Amount), new(big.Float).SetFloat64(math.Pow10(int(trade.BaseToken.Decimals)))).Float64()
trade.ForeignTradeID = rawSwap.Raw.TxHash.String()
trade.Time = time.Now()
trade.Source = dia.AnyswapExchange
trade.VerifiedPair = true
return
}
// GetSwapOutChannel returns the channel @sink delivering the events LogAnySwapOut.
func (s *AnyswapScraper) GetSwapOutChannel(tokens []common.Address, chainID string) (chan *anyswap.AnyswapV4RouterLogAnySwapOut, error) {
sink := make(chan *anyswap.AnyswapV4RouterLogAnySwapOut)
anyswapRouterContractAddress := s.anyswapAssetInfo[chainID][strings.ToLower(tokens[0].Hex())].(map[string]interface{})["router"].(string)
outFiltererContract, err := anyswap.NewAnyswapV4RouterFilterer(common.HexToAddress(anyswapRouterContractAddress), s.WsClientMap[chainID])
if err != nil {
log.Fatal(err)
}
_, err = outFiltererContract.WatchLogAnySwapOut(&bind.WatchOpts{}, sink, tokens, []common.Address{}, []common.Address{})
if err != nil {
return sink, err
}
return sink, nil
}
// getClientMaps returns maps for rest and ws clients. Keys are the corresponding chain IDs.
func getClientMaps() (map[string]*ethclient.Client, map[string]*ethclient.Client, error) {
restClientMap := make(map[string]*ethclient.Client)
wsClientMap := make(map[string]*ethclient.Client)
for key := range chainMap {
restClient, err := ethclient.Dial(utils.Getenv("ETH_URI_REST_"+key, ""))
if err != nil {
return restClientMap, wsClientMap, err
}
restClientMap[key] = restClient
wsClient, err := ethclient.Dial(utils.Getenv("ETH_URI_WS_"+key, ""))
if err != nil {
return restClientMap, wsClientMap, err
}
wsClientMap[key] = wsClient
}
return restClientMap, wsClientMap, nil
}
// getAddressesByChain returns all addresses of assets which can be bridged away from the chain with @chainID.
// This includes anyTokens.
func getAddressesByChain(chainID string) (addresses []common.Address, err error) {
allAssetsAllChains, err := fetchEndpoint(anyswapAPIURL)
if err != nil {
return
}
for address := range allAssetsAllChains[chainID] {
addresses = append(addresses, common.HexToAddress(address))
anyAddress := allAssetsAllChains[chainID][address].(map[string]interface{})["anyToken"].(map[string]interface{})["address"].(string)
addresses = append(addresses, common.HexToAddress(anyAddress))
}
return
}
// getAnyTokenMap maps an anyToken to its underlying asset.
func getAnyTokenMap() (map[string]string, error) {
anyTokenMap := make(map[string]string)
allAssetsAllChains, err := fetchEndpoint(anyswapAPIURL)
if err != nil {
return anyTokenMap, err
}
for chainID := range allAssetsAllChains {
for address := range allAssetsAllChains[chainID] {
anyAddress := allAssetsAllChains[chainID][address].(map[string]interface{})["anyToken"].(map[string]interface{})["address"].(string)
anyTokenMap[chainID+"-"+common.HexToAddress(anyAddress).Hex()] = common.HexToAddress(address).Hex()
}
}
return anyTokenMap, nil
}
// fetchEndpoint returns all assets available in the Anyswap bridge obtained through an API endpoint.
func fetchEndpoint(url string) (response map[string]map[string]interface{}, err error) {
// @response is of type map[chainID]map[assetAddress]interface{}
data, _, err := utils.GetRequest(url)
if err != nil {
return
}
err = json.Unmarshal(data, &response)
if err != nil {
return
}
return
}
// FetchAvailablePairs returns a list with all available trade pairs as dia.ExchangePair for the pairDiscorvery service
func (s *AnyswapScraper) FetchAvailablePairs() (pairs []dia.ExchangePair, err error) {
// TO DO: Use API in order to fetch available pairs
// https://bridgeapi.anyswap.exchange/v3/serverinfoV3?chainId=all&version=STABLEV3
return
}
// FillSymbolData is not used by DEX scrapers.
func (s *AnyswapScraper) FillSymbolData(symbol string) (dia.Asset, error) {
return dia.Asset{Symbol: symbol}, nil
}
func (up *AnyswapScraper) NormalizePair(pair dia.ExchangePair) (dia.ExchangePair, error) {
return pair, nil
}
// Close closes any existing API connections, as well as channels of
// PairScrapers from calls to ScrapePair
func (s *AnyswapScraper) Close() error {
if s.closed {
return errors.New("UniswapScraper: Already closed")
}
for i := range s.RestClientMap {
s.WsClientMap[i].Close()
s.RestClientMap[i].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 *AnyswapScraper) 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 := &AnyswapPairScraper{
parent: s,
pair: pair,
}
s.pairScrapers[pair.ForeignName] = ps
return ps, nil
}
// UniswapPairScraper implements PairScraper for Uniswap
type AnyswapPairScraper struct {
parent *AnyswapScraper
pair dia.ExchangePair
closed bool
}
// Close stops listening for trades of the pair associated with s
func (ps *AnyswapPairScraper) Close() error {
ps.closed = true
return nil
}
// Channel returns a channel that can be used to receive trades
func (ps *AnyswapScraper) Channel() chan *dia.Trade {
return ps.chanTrades
}
// Error returns an error when the channel Channel() is closed
// and nil otherwise
func (ps *AnyswapPairScraper) 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 *AnyswapPairScraper) Pair() dia.ExchangePair {
return ps.pair
}