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<?php
// Sample Pluggable datasource for PHP Weathermap 0.9
// - read a pair of values from a database, and return it

// TARGET dbplug:databasename:username:pass:hostkey

class WeatherMapDataSource_mrtg extends WeatherMapDataSource {

        function Recognise($targetstring)
        {
                if(preg_match("/\.(htm|html)$/",$targetstring,$matches))
                {
                        return TRUE;
                }
                else
                {
                        return FALSE;
                }
        }

        function ReadData($targetstring, &$map, &$item)
        {
                $data[IN] = NULL;
                $data[OUT] = NULL;
                $data_time = 0;
                
                $matchvalue= $item->get_hint('mrtg_value');
                $matchperiod = $item->get_hint('mrtg_period');
                $swap = intval($item->get_hint('mrtg_swap'));
                $negate = intval($item->get_hint('mrtg_negate'));
                                
                if($matchvalue =='') $matchvalue = "cu";
                if($matchperiod =='') $matchperiod = "d";       
                                
                $fd=fopen($targetstring, "r");

                if ($fd)
                {
                        while (!feof($fd))
                        {
                                $buffer=fgets($fd, 4096);
                                debug("MRTG ReadData: Matching on '${matchvalue}in $matchperiod' and '${matchvalue}out $matchperiod'\n");

                                if (preg_match("/<\!-- ${matchvalue}in $matchperiod ([-+]?\d+\.?\d*) -->/", $buffer, $matches)) { $data[IN] = $matches[1] * 8; }
                                if (preg_match("/<\!-- ${matchvalue}out $matchperiod ([-+]?\d+\.?\d*) -->/", $buffer, $matches)) { $data[OUT] = $matches[1] * 8; }
                        }
                        fclose($fd);
                        # don't bother with the modified time if the target is a URL
                        if(! preg_match('/^[a-z]+:\/\//',$targetstring) )
                        {
                                $data_time = filemtime($targetstring);
                        }
                }
                else
                {
                        // some error code to go in here
                        debug ("MRTG ReadData: Couldn't open ($targetstring). \n"); 
                }
                
                if($swap==1)
                {
                        debug("MRTG ReadData: Swapping IN and OUT\n");
                        $t = $data[OUT];
                        $data[OUT] = $data[IN];
                        $data[IN] = $t;
                }
                
                if($negate)
                {
                        debug("MRTG ReadData: Negating values\n");
                        $data[OUT] = -$data[OUT];
                        $data[IN] = -$data[IN];
                }
                
                debug ("MRTG ReadData: Returning (".($data[IN]===NULL?'NULL':$data[IN]).",".($data[OUT]===NULL?'NULL':$data[OUT]).",$data_time)\n");

                return( array($data[IN], $data[OUT], $data_time) );
        }
}

// vim:ts=4:sw=4:
?>