public static function exportPNGAsync($slug, $query, $width, $height)
{
$phantomjs = base_path() . "/node_modules/.bin/phantomjs";
$rasterize = base_path() . "/phantomjs/rasterize.js";
$target = \Request::root() . "/" . $slug . ".export" . "?" . $query;
$queryHash = hash('md5', $query);
$file = public_path() . "/exports/" . $slug . "-" . $queryHash . ".png";
$tmpfile = $file . "#tmp";
if (!file_exists($file) && !file_exists($tmpfile)) {
// Create a temporary marker file so we don't double up on requests
touch($tmpfile);
$command = $phantomjs . " " . $rasterize . " " . escapeshellarg($target) . " " . escapeshellarg($file) . " '" . $width . "px*" . $height . "px'" . " >/dev/null 2>/dev/null &";
Log::info($command);
exec($command);
}
}
