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utils.go
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/
utils.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"math/big"
"net/http"
"github.com/shopspring/decimal"
)
// ToDecimal wei to decimals
func ToDecimal(ivalue interface{}) decimal.Decimal {
value := new(big.Int)
switch v := ivalue.(type) {
case string:
value.SetString(v, 10)
case *big.Int:
value = v
}
mul := decimal.NewFromFloat(float64(10)).Pow(decimal.NewFromFloat(float64(18)))
num, _ := decimal.NewFromString(value.String())
result := num.Div(mul)
return result
}
func ToGwei(value *big.Int) *big.Int {
return big.NewInt(0).Div(value, big.NewInt(1e9))
}
// ToWei decimals to wei
func ToWei(iamount interface{}) *big.Int {
amount := decimal.NewFromFloat(0)
switch v := iamount.(type) {
case string:
amount, _ = decimal.NewFromString(v)
case float64:
amount = decimal.NewFromFloat(v)
case int64:
amount = decimal.NewFromFloat(float64(v))
case decimal.Decimal:
amount = v
case *decimal.Decimal:
amount = *v
}
mul := decimal.NewFromFloat(float64(10)).Pow(decimal.NewFromFloat(float64(18)))
result := amount.Mul(mul)
wei := new(big.Int)
wei.SetString(result.String(), 10)
return wei
}
// CalcGasCost calculate gas cost given gas limit (units) and gas price (wei)
func CalcGasCost(gasLimit uint64, gasPrice *big.Int) *big.Int {
gasLimitBig := big.NewInt(int64(gasLimit))
return gasLimitBig.Mul(gasLimitBig, gasPrice)
}
func makeRequest(url string, result interface{}) error {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return fmt.Errorf("%v", err)
}
res, err := http.DefaultClient.Do(req)
if err != nil {
return fmt.Errorf("error fetching request: %v", err)
}
body, err := ioutil.ReadAll(res.Body)
if err != nil {
return fmt.Errorf("error reading body: %v", err)
}
res.Body.Close()
// fmt.Println(string(body))
json.Unmarshal(body, result)
if err != nil {
return fmt.Errorf("error unmarshalling: %v", err)
}
return nil
}