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<?php
namespace Icinga\Module\Graphite\Web\Widget;
use Icinga\Module\Graphite\Graphing\Chart;
use Icinga\Web\Url;
use Icinga\Web\UrlParams;
use Icinga\Web\Widget\AbstractWidget;
use RuntimeException;
class GraphImage extends AbstractWidget
{
/**
* The chart to be rendered
*
* @var Chart
*/
protected $chart;
/**
* The rendered PNG image
*
* @var string|null
*/
protected $rendered;
/**
* Constructor
*
* @param Chart $chart The chart to be rendered
*/
public function __construct(Chart $chart)
{
$this->chart = $chart;
}
/**
* Render the graph lazily
*
* @return string
*/
public function render()
{
if ($this->rendered === null) {
$now = time();
$from = (int) $this->chart->getFrom();
if ($from < 0) {
$from += $now;
}
$until = (string) $this->chart->getUntil();
if ($until === '') {
$until = $now;
} else {
$until = (int) $until;
if ($until < 0) {
$until += $now;
}
}
$variables = $this->chart->getMetricVariables();
$template = $this->chart->getTemplate();
$graphiteWebClient = $this->chart->getGraphiteWebClient();
$params = (new UrlParams())->addValues([
'from' => $from,
'until' => $until,
'bgcolor' => $this->chart->getBackgroundColor() ?? 'black',
'fgcolor' => $this->chart->getForegroundColor() ?? 'white',
'majorGridLineColor' => $this->chart->getMajorGridLineColor() ?? '0000003F',
'minorGridLineColor' => $this->chart->getMinorGridLineColor() ?? 'black',
'width' => $this->chart->getWidth(),
'height' => $this->chart->getHeight(),
'hideLegend' => (string) ! $this->chart->getShowLegend(),
'tz' => date_default_timezone_get(),
'_salt' => "$now.000",
'vTitle' => 'Percent',
'lineMode' => 'connected',
'drawNullAsZero' => 'false',
'graphType' => 'line',
'_ext' => 'whatever.svg'
]);
foreach ($template->getUrlParams() as $key => $value) {
$params->set($key, $value->resolve($variables));
}
$metrics = $this->chart->getMetrics();
$allVars = [];
foreach ($template->getCurves() as $curveName => $curve) {
if (!isset($metrics[$curveName])) {
continue;
}
$vars = $curve[0]->reverseResolve($metrics[$curveName]);
if ($vars !== false) {
$allVars = array_merge($allVars, $vars);
}
}
foreach ($metrics as $curveName => $metric) {
$allVars['metric'] = $metric;
$params->add('target', $template->getCurves()[$curveName][1]->resolve($allVars));
}
$url = Url::fromPath('/render')->setParams($params);
$headers = [
'Accept-language' => 'en',
'Content-type' => 'application/x-www-form-urlencoded'
];
for (;;) {
try {
$this->rendered = $graphiteWebClient->request($url, 'GET', $headers);
} catch (RuntimeException $e) {
if (preg_match('/\b500\b/', $e->getMessage())) {
// A 500 Internal Server Error, probably because of
// a division by zero because of a too low time range to render.
$until = (int) $url->getParam('until');
$diff = $until - (int) $url->getParam('from');
// Try to render a higher time range, but give up
// once our default (1h) has been reached (non successfully).
if ($diff < 3600) {
$url->setParam('from', $until - $diff * 2);
continue;
}
}
throw $e;
}
break;
}
}
return $this->rendered;
}
}
|
