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BalancerV2Scraper.go
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BalancerV2Scraper.go
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package liquidityscrapers
import (
"context"
"math"
"math/big"
"strings"
"time"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/diadata-org/diadata/pkg/dia/helpers/ethhelper"
balancervault "github.com/diadata-org/diadata/pkg/dia/scraper/exchange-scrapers/balancerv2/vault"
"github.com/diadata-org/diadata/pkg/utils"
"github.com/diadata-org/diadata/pkg/dia"
)
const (
balancerV2FilterPageSize = 5000
balancerV2RestDial = ""
)
type BalancerV2Scraper struct {
RestClient *ethclient.Client
poolChannel chan dia.Pool
doneChannel chan bool
blockchain string
exchangeName string
vaultContract string
startblockPoolRegister uint64
cachedAssets map[string]dia.Asset
}
// NewBalancerV2Scraper returns a Balancer V2 scraper
func NewBalancerV2Scraper(exchange dia.Exchange) *BalancerV2Scraper {
var (
restClient *ethclient.Client
err error
poolChannel = make(chan dia.Pool)
doneChannel = make(chan bool)
scraper *BalancerV2Scraper
)
log.Infof("Init rest client for %s.", exchange.BlockChain.Name)
restClient, err = ethclient.Dial(utils.Getenv(strings.ToUpper(exchange.BlockChain.Name)+"_URI_REST", balancerV2RestDial))
if err != nil {
log.Fatal("init rest client: ", err)
}
scraper = &BalancerV2Scraper{
RestClient: restClient,
poolChannel: poolChannel,
doneChannel: doneChannel,
blockchain: exchange.BlockChain.Name,
exchangeName: exchange.Name,
vaultContract: exchange.Contract,
cachedAssets: make(map[string]dia.Asset),
}
switch exchange.Name {
case dia.BalancerV2Exchange:
scraper.startblockPoolRegister = 12272146
case dia.BeetsExchange:
scraper.startblockPoolRegister = 16896080
}
go func() {
scraper.fetchPools()
}()
return scraper
}
// fetchPools collects all available pools and sends them into the pool channel.
func (scraper *BalancerV2Scraper) fetchPools() {
events, err := scraper.allRegisteredPools()
if err != nil {
log.Fatal("fetch all registered pools: ", err)
}
caller, err := balancervault.NewBalancerVaultCaller(common.HexToAddress(scraper.vaultContract), scraper.RestClient)
if err != nil {
log.Fatal("make balancer vault caller: ", err)
}
for _, evt := range events {
poolTokens, err := caller.GetPoolTokens(&bind.CallOpts{}, evt.PoolId)
if err != nil {
log.Warn("get pool tokens: ", err)
}
assetvolumes := scraper.extractPoolInfo(poolTokens)
pool := dia.Pool{
Exchange: dia.Exchange{Name: scraper.exchangeName},
Blockchain: dia.BlockChain{Name: scraper.blockchain},
Address: evt.PoolAddress.String(),
Assetvolumes: assetvolumes,
Time: time.Now(),
}
scraper.poolChannel <- pool
}
scraper.doneChannel <- true
}
// allRegisteredPools returns a slice of all pool creation events.
func (scraper *BalancerV2Scraper) allRegisteredPools() ([]*balancervault.BalancerVaultPoolRegistered, error) {
var (
offset uint64 = balancerV2FilterPageSize
startBlock uint64 = scraper.startblockPoolRegister
endBlock = startBlock + offset
events []*balancervault.BalancerVaultPoolRegistered
)
filterer, err := balancervault.NewBalancerVaultFilterer(common.HexToAddress(scraper.vaultContract), scraper.RestClient)
if err != nil {
return nil, err
}
currBlock, err := scraper.RestClient.BlockNumber(context.Background())
if err != nil {
return nil, err
}
for {
if endBlock > currBlock {
endBlock = currBlock
}
log.Infof("startblock - endblock: %v --- %v ", startBlock, endBlock)
it, err := filterer.FilterPoolRegistered(&bind.FilterOpts{
Start: startBlock,
End: &endBlock,
}, nil, nil)
if err != nil {
log.Warn("filterpoolregistered: ", err)
continue
}
for it.Next() {
events = append(events, it.Event)
log.Info("pool address: ", 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 events, nil
}
// extractPoolInfo returns assetvolumes in the correct format for a dia.Pool.
func (scraper *BalancerV2Scraper) extractPoolInfo(poolTokens struct {
Tokens []common.Address
Balances []*big.Int
LastChangeBlock *big.Int
}) (assetvolumes []dia.AssetVolume) {
for i := range poolTokens.Tokens {
asset, err := scraper.assetFromToken(poolTokens.Tokens[i])
if err != nil {
log.Error("get asset from token: ", err)
}
volume, _ := new(big.Float).Quo(big.NewFloat(0).SetInt(poolTokens.Balances[i]), new(big.Float).SetFloat64(math.Pow10(int(asset.Decimals)))).Float64()
assetvolumes = append(assetvolumes, dia.AssetVolume{Asset: asset, Volume: volume})
}
return
}
// assetFromToken returns the dia.Asset corresponding to an address on the underlying scraper's blockchain.
func (scraper *BalancerV2Scraper) assetFromToken(token common.Address) (dia.Asset, error) {
cached, ok := scraper.cachedAssets[token.Hex()]
if !ok {
asset, err := ethhelper.ETHAddressToAsset(token, scraper.RestClient, scraper.blockchain)
if err != nil {
return dia.Asset{}, err
}
scraper.cachedAssets[token.Hex()] = asset
return asset, nil
} else {
return cached, nil
}
}
func (scraper *BalancerV2Scraper) Pool() chan dia.Pool {
return scraper.poolChannel
}
func (scraper *BalancerV2Scraper) Done() chan bool {
return scraper.doneChannel
}