/**
* First we check if we've made a request within in the wait limit, and if so,
* we return stale data. We also check if the static variable $_btcTickerStr is
* null (this will only happen on the first run). If its null, we are cool to make
* a call to MtGox to get the current ticker.
*
* Attempts to query the MtGox API. If the Request fails, we print an error message
* and do NOT update the _lastTickerRequest time.
*
* If the Request succeeds, we format a message for the channel, update the lastTickerRequest
* time and also set the current price of a BTC to the last sale price. This price is used
* to check limits/triggers against.
*
* @return string Return a ticker formatted string, or an error message on failure.
*/
private function getBitCoinData()
{
// Enforce that we can't hit the mtGox server more than once every 5 seconds.
if (time() > $this->_lastTickerRequest + self::mtgoxWaitSec || null == self::$_btcTickerStr) {
$btcJSON = file_get_contents(self::mtgoxTicketURL);
if (FALSE == $btcJSON) {
return 'Error retreiving ticker, try again soon.';
}
$btcSet = json_decode($btcJSON);
$spread = bcsub($btcSet->ticker->sell, $btcSet->ticker->buy, 6);
self::$_btcTickerStr = sprintf("(\$) High:%s Low:%s Vol:%s Bid:%s Ask:%s Last:%s Spread:%s", $btcSet->ticker->high, $btcSet->ticker->low, number_format($btcSet->ticker->vol), $btcSet->ticker->buy, $btcSet->ticker->sell, $btcSet->ticker->last, $spread);
$this->_lastTickerRequest = time();
// Set the current price to the last sale price.
$this->_currentBTCPrice = $btcSet->ticker->last;
return self::$_btcTickerStr;
}
return sprintf("[%ss stale] %s", time() - $this->_lastTickerRequest, self::$_btcTickerStr);
}
