I have this script that outputs the image to command line and if I redirect it to a file.png I can see correctly the graph, but if I try to do the same from the browser I can't see it on the fly.
I tried to split the script in 2 parts too, but don't work.
1 -> Generate the graph 2 -> Call the first script from this one and save all in a variable.
The script:
<?php
header("Content-Type: image/png");
header("Content-Transfer-Encoding: binary");
ob_flush();
require_once ('/opt/rMON/config.php');
//if(isset($_GET['id'])){
// $id = trim($_GET['id']);
//} else {
// die("El id?");
//}
//DEBUG ID
$id=1;
$result = ***MYSQL QUERY***
$ip = long2ip($result['ip']);
$interface = $result['interface'];
$counter = $result['counter'];
$unix_name = $result['unix_name'];
$community = $result['community'];
$version = $result['version'];
$port = $result['port'];
$rrd_file = __RRD_ROOT__.$unix_name.".rrd";
$graph_name = $result['name'];
$host_ip = long2ip($result['ip']);
$iface_name = $result['iface_name'];
$fecha = date("y-m-d h:i:s");
$start = "3600";
$tiempo = "1 Hora";
create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo);
function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo){
$opts = array (
"--imgformat=PNG",
"--slope-mode",
"--title=$graph_name ($host_ip) - $iface_name - $tiempo",
"--rigid",
"--base=1000",
"--height=120",
"--width=500",
"--alt-autoscale-max",
"--lower-limit=0",
"--font=TITLE:10:",
"--font=AXIS:8:",
"--font=LEGEND:8:",
"--font=UNIT:8:30:",
"--watermark=$fecha - Radu Radu",
"--start=-$start",
"--end=now",
"DEF:a=$rrd_file:$input:AVERAGE",
"DEF:b=$rrd_file:$output:AVERAGE",
"CDEF:cdefa=a,8,*",
"CDEF:cdefe=b,8,*",
"AREA:cdefa#00CF00FF:Entrante\t",
"GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
"LINE1:cdefe#002A97FF:Saliente\t",
"GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
);
$ret = rrd_graph("-", $opts);
if(!$ret){
echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
}
}
?>
I tried to output to php://output too with no luck.
As I see in the log, the output is going to the apache server log.
"dic 21 10:58:00 xxx.xxx.com httpd[27941]: [305B blob data]"
Thanks!!
You are doing it wrong. rrd_graph does not accept - for $filename and it returns an array with information about generated image; it does not output or flush any image data. The - $filename parameter is for the RRDGraph class. In order to have the image data, you need to either open the file generated by rrd_graph, read its data and output the data, or use RRDGraph returned array ['image'] key to get the binary image data.
Using rrd_graph function
function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo) {
$opts = array (
"--imgformat=PNG",
"--slope-mode",
"--title=$graph_name ($host_ip) - $iface_name - $tiempo",
"--rigid",
"--base=1000",
"--height=120",
"--width=500",
"--alt-autoscale-max",
"--lower-limit=0",
"--font=TITLE:10:",
"--font=AXIS:8:",
"--font=LEGEND:8:",
"--font=UNIT:8:30:",
"--watermark=$fecha - Radu Radu",
"--start=-$start",
"--end=now",
"DEF:a=$rrd_file:$input:AVERAGE",
"DEF:b=$rrd_file:$output:AVERAGE",
"CDEF:cdefa=a,8,*",
"CDEF:cdefe=b,8,*",
"AREA:cdefa#00CF00FF:Entrante\t",
"GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
"LINE1:cdefe#002A97FF:Saliente\t",
"GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
);
$fileName = "rrd.png";
$ret = rrd_graph($fileName, $opts);
if(!$ret){
echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
}
else {
header("Content-Type: image/png");
header("Content-Length: " . filesize($fileName));
$fp = fopen($fileName, 'rb');
if($fp) {
fpassthru($fp);
fclose($fp);
exit();
}
}
}
Using RRDGraph class
function create_graph($start, $graph_name, $fecha, $rrd_file, $input, $output, $host_ip, $iface_name, $tiempo){
$opts = array (
"--imgformat=PNG",
"--slope-mode",
"--title=$graph_name ($host_ip) - $iface_name - $tiempo",
"--rigid",
"--base=1000",
"--height=120",
"--width=500",
"--alt-autoscale-max",
"--lower-limit=0",
"--font=TITLE:10:",
"--font=AXIS:8:",
"--font=LEGEND:8:",
"--font=UNIT:8:30:",
"--watermark=$fecha - Radu Radu",
"--start=-$start",
"--end=now",
"DEF:a=$rrd_file:$input:AVERAGE",
"DEF:b=$rrd_file:$output:AVERAGE",
"CDEF:cdefa=a,8,*",
"CDEF:cdefe=b,8,*",
"AREA:cdefa#00CF00FF:Entrante\t",
"GPRINT:cdefa:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefa:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefa:MAX:Máximo\:%8.2lf %s",
"LINE1:cdefe#002A97FF:Saliente\t",
"GPRINT:cdefe:LAST:Actual\:%8.2lf %s",
"GPRINT:cdefe:AVERAGE:Promedio\:%8.2lf %s",
"GPRINT:cdefe:MAX:Máximo\:%8.2lf %s"
);
$graphObj = new RRDGraph('-');
$graphObj->setOptions($opts);
$ret = $graphObj->saveVerbose();
if(!$ret){
echo "ERROR en el objeto: $graph_name ".rrd_error()."\n";
}
else {
header("Content-type: image/png");
echo $res['image'];
exit();
}
}
You can read the question and answers here for a problem similar to yours.