function getChartData(array &$chartData, array &$contents, $patchIt = true)
{
//need to know depth of log file (numer of data points)
$depth = $this->logFileDepth;
//select 6,12 or 24 hour charts, 24 is default
$dataSet = LoadAvg::$_settings->general['settings']['chart_type'];
//echo 'dataSet ' . $dataSet . '<br>';
// this is based on logger interval of 5, 5 min = 300 aprox we add 100 to be safe
//$interval = 360; // 5 minutes is 300 seconds + slippage of 20% aprox
$interval = $this->getLoggerInterval();
$interval = $interval * 1.2;
//add 20% to interval for system lag
//get size of array for parsing
$totalContents = (int) count($contents);
//echo 'TOTAL ' . $totalContents;
//trim the dataset if we are only reading 6 or 12 hours of info
//revise for 6 and 12 hour charts
if ($dataSet == 6 || $dataSet == 12) {
//logger is every 5 min then $this->getLoggerInterval() / 60 = 5;
//so 300 / 60 = 5 min; 60 / 5 = 12 datasets per hour
$dataFrame = 60 / ($this->getLoggerInterval() / 60);
$dataNeeded = $dataFrame * $dataSet;
//TODO: only trim if there is more than we need...
$contents = array_slice($contents, $totalContents - $dataNeeded);
}
//contents is a array of strings for the dataset/logfile with the charts log data
//we explode each value in each line of the array into datapoints in chartData
//and send it back as a array!
$patch = $chartData = array();
$numPatches = 0;
//delimiter is based on logger type used to explode data
$delimiter = LoadUtility::getDelimiter();
//if there is only one item in data set then we just chart it and return
if ($totalContents == 1) {
$data = explode($delimiter, $contents[0]);
LoadUtility::cleanDataPoint($data, $depth);
$chartData[0] = $data;
} else {
//subtract one from totalContents as arrays start at 0 not 1
for ($i = 0; $i < $totalContents; ++$i) {
//grab the first dataset
$data = explode($delimiter, $contents[$i]);
LoadUtility::cleanDataPoint($data, $depth);
$chartData[$i] = $data;
/*
* if there is more than one item in dataset then we can check for downtime between points
* and patch the dataset so they render ok
* this is becuase when rendering we connect lines in the chart (prev to next)
* and so downtime comes across as span not a null or 0
*
* check if difference is more than logging interval and patch for when server is offline
* we patch for time between last data (system went down) and next data (system came up)
* need to check if we need the nextData patch as well ie if system came up within
* the next interval time
*
* for local data we dont check the first value in the data set as if its there it means it was up
*/
if ($i > 0 && $i < $totalContents - 1) {
//dont do this for last value in dataset! as it will have no difference
$nextData = explode($delimiter, $contents[$i + 1]);
//difference in timestamps
$difference = $nextData[0] - $data[0];
//if more time that the logging interval has passed it means
//the system was down as logger should send data every interval
if ($difference >= $interval) {
//$chartData[$i-1]['redline'] = true;
//echo 'patch difference:' . $difference;
//patches are spans ie fall between datapoints
//so each patch has a start and end
$patch[$numPatches] = array($data[0] + $interval, "REDLINE", $i);
$patch[$numPatches + 1] = array($nextData[0] - $interval / 2, "REDLINE", $i);
$numPatches += 2;
}
}
}
}
//if there are patches to be applied, we iterate through the patcharray
//and patch the dataset by inserting patch spans into it based on time
$totalPatch = (int) count($patch);
if ($totalPatch > 0 && $patchIt == true) {
//echo "PATCHCOUNT: " . $totalPatch . "<br>";
for ($i = 0; $i < $totalPatch; ++$i) {
//patch time is really patch key position in array
$patch_key_position = $patch[$i][2] + $i;
$newdata[0] = strval($patch[$i][0]);
$thepatch[0] = array_pad($newdata, $depth + 1, '0.0');
$thepatch[0]['redline'] = true;
//echo '<pre>patch'; var_dump ($thepatch); echo '</pre>';
array_splice($chartData, $patch_key_position, 0, $thepatch);
//echo "PATCHED: " . $patch_key_position . " count: " . count( $chartData ) . "<br>";
}
}
//echo '<pre>'; var_dump ($chartData); echo '</pre>';
}