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main.go
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main.go
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package main
import (
"context"
"errors"
"flag"
"fmt"
"log"
"math"
"math/big"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/juanefec/geth/erc20"
)
const (
USDT = "USDT"
UBI = "UBI"
ETH = "ETH"
)
var contracts = map[string]string{
USDT: "0xdac17f958d2ee523a2206206994597c13d831ec7",
UBI: "0xdd1ad9a21ce722c151a836373babe42c868ce9a4",
}
var infuraProject string
var account string
func main() {
flag.StringVar(&infuraProject, "p", "", "usage: -p b98dac6bacd66b879..")
flag.StringVar(&account, "a", "", "usage: -p 0xb98dac6bacd66b879..")
flag.Parse()
if infuraProject == "" {
log.Fatal("no infura project id")
}
eth, err := getBalance(account, "")
if err != nil {
log.Fatal(err)
}
usdt, err := getBalance(account, contracts[USDT])
if err != nil {
log.Fatal(err)
}
ubi, err := getBalance(account, contracts[UBI])
if err != nil {
log.Fatal(err)
}
fmt.Printf("%v\n%v\n%v\n", eth, usdt, ubi)
}
func getBalance(addr, token string) (string, error) {
if addr == "" {
return "", errors.New("address can't be empty")
}
account := common.HexToAddress(addr)
client, err := ethclient.Dial("https://mainnet.infura.io/v3/" + infuraProject)
if err != nil {
log.Fatal(err)
}
defer client.Close()
if token == "" {
balance, err := client.BalanceAt(context.Background(), account, nil)
if err != nil {
log.Fatal(err)
}
fbalance := new(big.Float)
fbalance.SetString(balance.String())
ethValue := new(big.Float).Quo(fbalance, big.NewFloat(math.Pow10(18)))
return fmt.Sprintf("%v %v", ETH, ethValue), nil
}
contract := common.HexToAddress(token)
instance, err := erc20.NewToken(contract, client)
if err != nil {
log.Fatal(err)
}
bal, err := instance.BalanceOf(&bind.CallOpts{}, account)
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)
}
fbal := new(big.Float)
fbal.SetString(bal.String())
value := new(big.Float).Quo(fbal, big.NewFloat(math.Pow10(int(decimals))))
return fmt.Sprintf("%v %v", symbol, value), nil
}