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contract_erc20.go
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contract_erc20.go
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package main
import (
"context"
"fmt"
"log"
"math"
"math/big"
"os"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethclient"
token "github.com/CryptoRbtree/goeth-client/contract-erc20"
)
func contractErc20() {
var (
ctx = context.Background()
url = "https://eth-mainnet.g.alchemy.com/v2/" + os.Getenv("ALCHEMY_ID")
client, err = ethclient.DialContext(ctx, url)
)
if err != nil {
log.Fatal(err)
}
tokenAddress := common.HexToAddress("0x6B175474E89094C44Da98b954EedeAC495271d0F") // DAI Address
instance, err := token.NewToken(tokenAddress, client)
if err != nil {
log.Fatal(err)
}
address := common.HexToAddress("0x245cc372c84b3645bf0ffe6538620b04a217988b") // Olympus funds
bal, err := instance.BalanceOf(&bind.CallOpts{}, address)
if err != nil {
log.Fatal(err)
}
name, err := instance.Name(&bind.CallOpts{})
if err != nil {
log.Fatal(err)
}
symbol, err := instance.Symbol(&bind.CallOpts{})
if err != nil {
log.Fatal(err)
}
decimals, err := instance.Decimals(&bind.CallOpts{})
if err != nil {
log.Fatal(err)
}
fmt.Printf("name: %s\n", name)
fmt.Printf("symbol: %s\n", symbol)
fmt.Printf("decimals: %v\n", decimals)
fbal := new(big.Float)
fbal.SetString(bal.String())
value := new(big.Float).Quo(fbal, big.NewFloat(math.Pow10(int(decimals))))
fmt.Printf("balance: %f\n", value)
}