I am trying to convert this simple python function to golang, but facing issues with this error
panic: interface conversion: interface {} is string, not float64
python
def binance(crypto: str, currency: str):
import requests
base_url = "https://www.binance.com/api/v3/avgPrice?symbol={}{}"
base_url = base_url.format(crypto, currency)
try:
result = requests.get(base_url).json()
print(result)
result = result.get("price")
except Exception as e:
return False
return result
here is the golang version(longer code and more complicated code than should be)
func Binance(crypto string, currency string) (float64, error) {
req, err := http.NewRequest("GET", fmt.Sprintf("https://www.binance.com/api/v3/avgPrice?symbol=%s%s", crypto, currency), nil)
if err != nil {
fmt.Println("Error is req: ", err)
}
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
fmt.Println("error in send req: ", err)
}
respBody, _ := ioutil.ReadAll(resp.Body)
var respMap map[string]interface{}
log.Printf("body=%v",respBody)
json.Unmarshal(respBody,&respMap)
log.Printf("response=%v",respMap)
price := respMap["price"]
log.Printf("price=%v",price)
pricer := price.(float64)
return pricer, err
}
so what am I getting wrong here? Previously i had the error cannot use price (type interface {}) as type float64 in return argument: need type assertion and now i tried the type assertion with pricer := price.(float64) and now this error
panic: interface conversion: interface {} is string, not float64
It's telling you in the error, price is a string, not a float64, so you need to do (presumably):
pricer := price.(string)
return strconv.ParseFloat(pricer, 64)
A better way would probably be to instead do
type response struct {
Price float64 `json:",string"`
}
r := &response{}
respBody, _ := ioutil.ReadAll(resp.Body)
err := json.Unmarshal(respBody, r)
return r.Price, err
The "string" option signals that a field is stored as JSON inside a JSON-encoded string. It applies only to fields of string, floating point, integer, or boolean types.