/**
* First we check if we've attempted to make a request w/in the time limit for Bitcoincharts.
* If so, return stale data.
*
* If we haven't made a request, or $_btcCurrencyStr is null (only on first run), we attempt
* to make a GET Requst to the bitcoincharts API. If we don't get a respone we return an error
* message.
*
* If we get a response, we format a currency string for the channel and update the
* _lastCurrencyRequest.
*
* @return string A currency string or an error message on failure.
*/
private function getCurrencyData()
{
// Enforce that we can't hit the Bitcoins server more than once every 15 minutes.
if (time() > $this->_lastCurrencyRequest + self::bChartsWaitSec || null == self::$_btcCurrencyStr) {
$currencyJSON = file_get_contents(self::btcchartsURL);
if (FALSE == $currencyJSON) {
return 'Error retreiving currency, try again soon.';
}
$cSet = json_decode($currencyJSON);
self::$_btcCurrencyStr = sprintf("USD 24h:%s 7d:%s 30d:%s", $cSet->USD->{'24h'}, $cSet->USD->{'7d'}, $cSet->USD->{'30d'});
$this->_lastCurrencyRequest = time();
return self::$_btcCurrencyStr;
}
return sprintf("[%ss stale] %s", time() - $this->_lastCurrencyRequest, self::$_btcCurrencyStr);
}
