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<?php // vim:fenc=utf-8:filetype=php:ts=4
/*
* Copyright (C) 2009 Bruno Prémont <bonbons AT linux-vserver.org>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; only version 2 of the License is applicable.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
error_reporting(E_ALL | E_NOTICE | E_WARNING);
require('config.php');
require('functions.php');
require('definitions.php');
function makeTextBlock($text, $fontfile, $fontsize, $width) {
// TODO: handle explicit line-break!
$words = explode(' ', $text);
$lines = array($words[0]);
$currentLine = 0;
foreach ($words as $word) {
$lineSize = imagettfbbox($fontsize, 0, $fontfile, $lines[$currentLine] . ' ' . $word);
if($lineSize[2] - $lineSize[0] < $width) {
$lines[$currentLine] .= ' ' . $word;
} else {
$currentLine++;
$lines[$currentLine] = $word;
}
}
error_log(sprintf('Handles message "%s", %d words => %d/%d lines', $text, count($words), $currentLine, count($lines)));
return implode("\n", $lines);
}
/**
* No RRD files found that could match request
* @code HTTP error code
* @code_msg Short text description of HTTP error code
* @title Title for fake RRD graph
* @msg Complete error message to display in place of graph content
*/
function error($code, $code_msg, $title, $msg) {
global $config;
header(sprintf("HTTP/1.0 %d %s", $code, $code_msg));
header("Pragma: no-cache");
header("Expires: Mon, 01 Jan 2008 00:00:00 CET");
header("Content-Type: image/png");
$w = $config['rrd_width']+81;
$h = $config['rrd_height']+79;
$png = imagecreate($w, $h);
$c_bkgnd = imagecolorallocate($png, 240, 240, 240);
$c_fgnd = imagecolorallocate($png, 255, 255, 255);
$c_blt = imagecolorallocate($png, 208, 208, 208);
$c_brb = imagecolorallocate($png, 160, 160, 160);
$c_grln = imagecolorallocate($png, 114, 114, 114);
$c_grarr = imagecolorallocate($png, 128, 32, 32);
$c_txt = imagecolorallocate($png, 0, 0, 0);
$c_etxt = imagecolorallocate($png, 64, 0, 0);
if (function_exists('imageantialias'))
imageantialias($png, true);
imagefilledrectangle($png, 0, 0, $w, $h, $c_bkgnd);
imagefilledrectangle($png, 51, 33, $w-31, $h-47, $c_fgnd);
imageline($png, 51, 30, 51, $h-43, $c_grln);
imageline($png, 48, $h-46, $w-28, $h-46, $c_grln);
imagefilledpolygon($png, array(49, 30, 51, 26, 53, 30), 3, $c_grarr);
imagefilledpolygon($png, array($w-28, $h-48, $w-24, $h-46, $w-28, $h-44), 3, $c_grarr);
imageline($png, 0, 0, $w, 0, $c_blt);
imageline($png, 0, 1, $w, 1, $c_blt);
imageline($png, 0, 0, 0, $h, $c_blt);
imageline($png, 1, 0, 1, $h, $c_blt);
imageline($png, $w-1, 0, $w-1, $h, $c_brb);
imageline($png, $w-2, 1, $w-2, $h, $c_brb);
imageline($png, 1, $h-2, $w, $h-2, $c_brb);
imageline($png, 0, $h-1, $w, $h-1, $c_brb);
imagestring($png, 4, ceil(($w-strlen($title)*imagefontwidth(4)) / 2), 10, $title, $c_txt);
imagestring($png, 5, 60, 35, sprintf('%s [%d]', $code_msg, $code), $c_etxt);
if (function_exists('imagettfbbox') && is_file($config['error_font'])) {
// Detailed error message
$fmt_msg = makeTextBlock($msg, $errorfont, 10, $w-86);
$fmtbox = imagettfbbox(12, 0, $errorfont, $fmt_msg);
imagettftext($png, 10, 0, 55, 35+3+imagefontwidth(5)-$fmtbox[7]+$fmtbox[1], $c_txt, $errorfont, $fmt_msg);
} else {
imagestring($png, 4, 53, 35+6+imagefontwidth(5), $msg, $c_txt);
}
imagepng($png);
imagedestroy($png);
}
/**
* No RRD files found that could match request
*/
function error404($title, $msg) {
return error(404, "Not found", $title, $msg);
}
/**
* Incomplete / invalid request
*/
function error400($title, $msg) {
return error(400, "Bad request", $title, $msg);
}
/**
* Incomplete / invalid request
*/
function error500($title, $msg) {
return error(500, "Internal error", $title, $msg);
}
// Process input arguments
$host = read_var('host', $_GET, null);
if (is_null($host))
return error400("?/?-?/?", "Missing host name");
else if (!is_string($host))
return error400("?/?-?/?", "Expecting exactly 1 host name");
else if (strlen($host) == 0)
return error400("?/?-?/?", "Host name may not be blank");
$plugin = read_var('plugin', $_GET, null);
if (is_null($plugin))
return error400($host.'/?-?/?', "Missing plugin name");
else if (!is_string($plugin))
return error400($host.'/?-?/?', "Plugin name must be a string");
else if (strlen($plugin) == 0)
return error400($host.'/?-?/?', "Plugin name may not be blank");
$pinst = read_var('plugin_instance', $_GET, '');
if (!is_string($pinst))
return error400($host.'/'.$plugin.'-?/?', "Plugin instance name must be a string");
$type = read_var('type', $_GET, '');
if (is_null($type))
return error400($host.'/'.$plugin.(strlen($pinst) ? '-'.$pinst : '').'/?', "Missing type name");
else if (!is_string($type))
return error400($host.'/'.$plugin.(strlen($pinst) ? '-'.$pinst : '').'/?', "Type name must be a string");
else if (strlen($type) == 0)
return error400($host.'/'.$plugin.(strlen($pinst) ? '-'.$pinst : '').'/?', "Type name may not be blank");
$tinst = read_var('type_instance', $_GET, '');
$graph_identifier = $host.'/'.$plugin.(strlen($pinst) ? '-'.$pinst : '').'/'.$type.(strlen($tinst) ? '-'.$tinst : '-*');
$timespan = read_var('timespan', $_GET, $config['timespan'][0]['name']);
$timespan_ok = false;
foreach ($config['timespan'] as &$ts)
if ($ts['name'] == $timespan)
$timespan_ok = true;
if (!$timespan_ok)
return error400($graph_identifier, "Unknown timespan requested");
$logscale = (boolean)read_var('logarithmic', $_GET, false);
$tinylegend = (boolean)read_var('tinylegend', $_GET, false);
// Check that at least 1 RRD exists for the specified request
$all_tinst = collectd_list_types($host, $plugin, $pinst, $type);
if (count($all_tinst) == 0)
return error404($graph_identifier, "No rrd file found for graphing");
// Now that we are read, do the bulk work
load_graph_definitions($logscale, $tinylegend);
$pinst = strlen($pinst) == 0 ? null : $pinst;
$tinst = strlen($tinst) == 0 ? null : $tinst;
$opts = array();
$opts['timespan'] = $timespan;
if ($logscale)
$opts['logarithmic'] = 1;
if ($tinylegend)
$opts['tinylegend'] = 1;
$rrd_cmd = false;
if ((is_null($tinst) || $tinst == '@merge') && isset($MetaGraphDefs[$type])) {
$identifiers = array();
foreach ($all_tinst as &$atinst)
$identifiers[] = collectd_identifier($host, $plugin, is_null($pinst) ? '' : $pinst, $type, $atinst);
collectd_flush($identifiers);
$rrd_cmd = $MetaGraphDefs[$type]($host, $plugin, $pinst, $type, $all_tinst, $opts);
} else {
if (!in_array(is_null($tinst) ? '' : $tinst, $all_tinst))
return error404($host.'/'.$plugin.(!is_null($pinst) ? '-'.$pinst : '').'/'.$type.(!is_null($tinst) ? '-'.$tinst : ''), "No rrd file found for graphing");
collectd_flush(collectd_identifier($host, $plugin, is_null($pinst) ? '' : $pinst, $type, is_null($tinst) ? '' : $tinst));
if (isset($GraphDefs[$type]))
$rrd_cmd = collectd_draw_generic($timespan, $host, $plugin, $pinst, $type, $tinst);
else
$rrd_cmd = collectd_draw_rrd($host, $plugin, $pinst, $type, $tinst);
}
if (isset($_GET['debug'])) {
header('Content-Type: text/plain; charset=utf-8');
printf("Would have executed:\n%s\n", $rrd_cmd);
return 0;
} else if ($rrd_cmd) {
header('Content-Type: image/png');
header('Cache-Control: max-age=60');
$rt = 0;
passthru($rrd_cmd, $rt);
if ($rt != 0)
return error500($graph_identifier, "RRD failed to generate the graph: ".$rt);
return $rt;
} else {
return error500($graph_identifier, "Failed to tell RRD how to generate the graph");
}
?>
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