Function weather_underground::fetch_observation

pub async fn fetch_observation(
    client: &Client, 
    api_key: &str, 
    station_id: &str, 
    unit: &Unit
) -> Result<Option<Value>, Error>

Fetch observations from the weatherunderground api

use std::convert::TryFrom;
use std::time::Duration;
use weather_underground as wu;
async {
    let client = wu::create_client(Duration::from_secs(2)).unwrap();
    let api_key = wu::fetch_api_key(&client).await.unwrap();
    let unit = wu::Unit::Metric;
    let result = wu::fetch_observation(&client, api_key.as_str(), "IPARIS18204", &unit).await.unwrap();
    if let Some(response) = result {
        let response = wu::ObservationResponse::try_from(response).unwrap();
        println!("response: {:?}", response);
    } else {
        println!("no data from server");
    }
};