private void fetch_bitcoin_rate()
{
int refetch_interval_minutes = 60;
bool need_to_fetch = false;
if (!exchange_rates.Keys.Contains("BTC"))
{
exchange_rates["BTC"] = new exchange_rate();
need_to_fetch = true;
}
else if (exchange_rates["BTC"].time_fetched.AddMinutes(refetch_interval_minutes) < DateTime.Now)
{
need_to_fetch = true;
}
if (need_to_fetch)
{
string url = "http://www.bitcoincharts.com/t/weighted_prices.json";
string data = urlread(url);
JObject j = JsonConvert.DeserializeObject<JObject>(data);
exchange_rates["BTC"].rate = 1.0 / Convert.ToDouble(j["USD"]["24h"].ToString());
exchange_rates["BTC"].time_fetched = DateTime.Now;
save_exchange_rates_in_settings();
}
}
private void fetch_currency_exchange_rates()
{
bool need_to_fetch = check_currencies_must_be_updated();
if (need_to_fetch)
{
string url = "http://openexchangerates.org/latest.json";
string data = urlread(url);
DateTime time_fetched = DateTime.Now;
JObject j = JsonConvert.DeserializeObject<JObject>(data);
foreach (JProperty rate in j["rates"])
{
string code = rate.Name;
double rate_value = Convert.ToDouble(rate.Value.ToString());
if (!(exchange_rates.Keys.Contains(code)))
{
exchange_rates[code] = new exchange_rate();
}
exchange_rates[code].rate = rate_value;
exchange_rates[code].time_fetched = time_fetched;
}
save_exchange_rates_in_settings();
}
}
private bool check_currency_list_for_refresh(string[] currency_list)
{
int refetch_interval_minutes = 60;
bool need_to_fetch = false;
foreach (string code in currency_list)
{
if (!(exchange_rates.Keys.Contains(code)))
{
exchange_rates[code] = new exchange_rate();
need_to_fetch = true;
}
else if (exchange_rates[code].time_fetched.AddMinutes(refetch_interval_minutes) < DateTime.Now)
{
need_to_fetch = true;
}
}
return need_to_fetch;
}