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functions.php
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<?php
#
# Some common functions for the Ganglia PHP website.
# Assumes the Gmeta XML tree has already been parsed,
# and the global variables $metrics, $clusters, and $hosts
# have been set.
#
include_once ( dirname(__FILE__) . "/lib/json.php" );
#
# Load event API driver.
#
$driver = ucfirst(strtolower( !isset($conf['overlay_events_provider']) ? "Json" : $conf['overlay_events_provider'] ));
if (file_exists( dirname(__FILE__) . "/lib/Events/Driver_${driver}.php")) {
include_once( dirname(__FILE__) . "/lib/Events/Driver_${driver}.php" );
}
#------------------------------------------------------------------------------
# Allows a form of inheritance for template files.
# If a file does not exist in the chosen template, the
# default is used. Cuts down on code duplication.
function template ($name)
{
global $conf;
$fn = "./templates/${conf['template_name']}/$name";
$default = "./templates/default/$name";
if (file_exists($fn)) {
return $fn;
}
else {
return $default;
}
}
#------------------------------------------------------------------------------
# Creates a hidden input field in a form. Used to save CGI variables.
function hiddenvar ($name, $var)
{
$hidden = "";
if ($var) {
#$url = rawurlencode($var);
$hidden = "<input type=\"hidden\" name=\"$name\" value=\"$var\">\n";
}
return $hidden;
}
#------------------------------------------------------------------------------
# Gives a readable time string, from a "number of seconds" integer.
# Often used to compute uptime.
function uptime($uptimeS)
{
$uptimeD=intval($uptimeS/86400);
$uptimeS=$uptimeD ? $uptimeS % ($uptimeD*86400) : $uptimeS;
$uptimeH=intval($uptimeS/3600);
$uptimeS=$uptimeH ? $uptimeS % ($uptimeH*3600) : $uptimeS;
$uptimeM=intval($uptimeS/60);
$uptimeS=$uptimeM ? $uptimeS % ($uptimeM*60) : $uptimeS;
$s = ($uptimeD!=1) ? "s" : "";
return sprintf("$uptimeD day$s, %d:%02d:%02d",$uptimeH,$uptimeM,$uptimeS);
}
#------------------------------------------------------------------------------
# Try to determine a nodes location in the cluster. Attempts to find the
# LOCATION attribute first. Requires the host attribute array from
# $hosts[$cluster][$name], where $name is the hostname.
# Returns [-1,-1,-1] if we could not determine location.
#
function findlocation($attrs)
{
$rack=$rank=$plane=-1;
$loc=$attrs['LOCATION'];
if ($loc) {
sscanf($loc, "%d,%d,%d", $rack, $rank, $plane);
#echo "Found LOCATION: $rack, $rank, $plane.<br>";
}
if ($rack<0 or $rank<0) {
# Try to parse the host name. Assumes a compute-<rack>-<rank>
# naming scheme.
$n=sscanf($attrs['NAME'], "compute-%d-%d", $rack, $rank);
$plane=0;
}
return array($rack,$rank,$plane);
}
#------------------------------------------------------------------------------
function cluster_sum($name, $metrics)
{
$sum = 0;
foreach ($metrics as $host => $val)
{
if(isset($val[$name]['VAL'])) $sum += $val[$name]['VAL'];
}
return $sum;
}
#------------------------------------------------------------------------------
function cluster_min($name, $metrics)
{
$min = "";
foreach ($metrics as $host => $val)
{
$v = $val[$name]['VAL'];
if (!is_numeric($min) or $min < $v)
{
$min = $v;
$minhost = $host;
}
}
return array($min, $minhost);
}
#------------------------------------------------------------------------------
#
# A useful function for giving the correct picture for a given
# load. Scope is "node | cluster | grid". Value is 0 <= v <= 1.
function load_image ($scope, $value)
{
global $conf;
$scaled_load = $value / $conf['load_scale'];
if ($scaled_load>1.00) {
$image = template("images/${scope}_overloaded.jpg");
}
else if ($scaled_load>=0.75) {
$image = template("images/${scope}_75-100.jpg");
}
else if ($scaled_load >= 0.50) {
$image = template("images/${scope}_50-74.jpg");
}
else if ($scaled_load>=0.25) {
$image = template("images/${scope}_25-49.jpg");
}
else {
$image = template("images/${scope}_0-24.jpg");
}
return $image;
}
#------------------------------------------------------------------------------
# A similar function that specifies the background color for a graph
# based on load. Quantizes the load figure into 6 sets.
function load_color ($value)
{
global $conf;
$scaled_load = $value / $conf['load_scale'];
if ($scaled_load>1.00) {
$color = $conf['load_colors']["100+"];
}
else if ($scaled_load>=0.75) {
$color = $conf['load_colors']["75-100"];
}
else if ($scaled_load >= 0.50) {
$color = $conf['load_colors']["50-75"];
}
else if ($scaled_load>=0.25) {
$color = $conf['load_colors']["25-50"];
}
else if ($scaled_load < 0.0)
$color = $conf['load_colors']["down"];
else {
$color = $conf['load_colors']["0-25"];
}
return $color;
}
#------------------------------------------------------------------------------
#
# Just a useful function to print the HTML for
# the load/death of a cluster node
function node_image ($metrics)
{
global $hosts_down;
# More rigorous checking if variables are set before trying to use them.
if ( isset($metrics['cpu_num']['VAL']) and $metrics['cpu_num']['VAL'] != 0 ) {
$cpu_num = $metrics['cpu_num']['VAL'];
} else {
$cpu_num = 1;
}
if ( isset($metrics['load_one']['VAL']) ) {
$load_one = $metrics['load_one']['VAL'];
} else {
$load_one = 0;
}
$value = $load_one / $cpu_num;
# Check if the host is down
# RFM - Added isset() check to eliminate error messages in ssl_error_log
if (isset($hosts_down) and $hosts_down)
$image = template("images/node_dead.jpg");
else
$image = load_image("node", $value);
return $image;
}
#------------------------------------------------------------------------------
#
# Finds the min/max over a set of metric graphs. Nodes is
# an array keyed by host names.
#
function find_limits($nodes, $metricname)
{
global $conf, $metrics, $clustername, $rrd_dir, $start, $end, $rrd_options;
if (!count($metrics))
return array(0, 0);
$firsthost = key($metrics);
if (array_key_exists($metricname,$metrics[$firsthost])) {
if ($metrics[$firsthost][$metricname]['TYPE'] == "string"
or $metrics[$firsthost][$metricname]['SLOPE'] == "zero")
return array(0,0);
}
else {
return array(0,0);
}
$max=0;
$min=0;
if ($conf['graph_engine'] == "graphite") {
$target = $conf['graphite_prefix'] . $clustername . ".[a-zA-Z0-9]*." . $metricname . ".sum";
$raw_highestMax = file_get_contents($conf['graphite_url_base'] . "?target=highestMax(" . $target . ",1)&from=" . $start . "&until=" . $end . "&format=json");
$highestMax = json_decode($raw_highestMax, TRUE);
$highestMaxDatapoints = $highestMax[0]['datapoints'];
$maxdatapoints = array();
foreach ( $highestMaxDatapoints as $datapoint ) {
array_push($maxdatapoints, $datapoint[0]);
}
$max = max($maxdatapoints);
}
else {
foreach ( $nodes as $host => $value ) {
$out = array();
$rrd_dir = "${conf['rrds']}/$clustername/$host";
$rrd_file = "$rrd_dir/$metricname.rrd";
if (file_exists($rrd_file)) {
if ( extension_loaded( 'rrd' ) ) {
$values = rrd_fetch($rrd_file,
array(
"--start", $start,
"--end", $end,
"AVERAGE"
)
);
$values = (array_filter(array_values($values['data']['sum']), 'is_finite'));
$thismax = max($values);
$thismin = min($values);
} else {
$command = $conf['rrdtool'] . " graph /dev/null $rrd_options ".
"--start $start --end $end ".
"DEF:limits='$rrd_dir/$metricname.rrd':'sum':AVERAGE ".
"PRINT:limits:MAX:%.2lf ".
"PRINT:limits:MIN:%.2lf";
exec($command, $out);
if(isset($out[1])) {
$thismax = $out[1];
} else {
$thismax = NULL;
}
if (!is_numeric($thismax)) continue;
$thismin=$out[2];
if (!is_numeric($thismin)) continue;
}
if ($max < $thismax) $max = $thismax;
if ($min > $thismin) $min = $thismin;
#echo "$host: $thismin - $thismax (now $value)<br>\n";
}
}
}
return array($min, $max);
}
#------------------------------------------------------------------------------
#
# Finds the avg of the given cluster & metric from the summary rrds.
#
function find_avg($clustername, $hostname, $metricname)
{
global $conf, $start, $end, $rrd_options;
$avg = 0;
if ($hostname)
$sum_dir = "${conf['rrds']}/$clustername/$hostname";
else
$sum_dir = "${conf['rrds']}/$clustername/__SummaryInfo__";
$command = $conf['rrdtool'] . " graph /dev/null $rrd_options ".
"--start $start --end $end ".
"DEF:avg='$sum_dir/$metricname.rrd':'sum':AVERAGE ".
"PRINT:avg:AVERAGE:%.2lf ";
exec($command, $out);
if ( isset($out[1]) )
$avg = $out[1];
else
$avg = 0;
#echo "$sum_dir: avg($metricname)=$avg<br>\n";
return $avg;
}
#------------------------------------------------------------------------------
# Alternate between even and odd row styles.
function rowstyle()
{
static $style;
if ($style == "even") { $style = "odd"; }
else { $style = "even"; }
return $style;
}
#------------------------------------------------------------------------------
# Return a version of the string which is safe for display on a web page.
# Potentially dangerous characters are converted to HTML entities.
# Resulting string is not URL-encoded.
function clean_string( $string )
{
return htmlentities( $string );
}
#------------------------------------------------------------------------------
function sanitize ( $string ) {
return escapeshellcmd( clean_string( rawurldecode( $string ) ) ) ;
}
#------------------------------------------------------------------------------
# If arg is a valid number, return it. Otherwise, return null.
function clean_number( $value )
{
return is_numeric( $value ) ? $value : null;
}
#------------------------------------------------------------------------------
# Return true if string is a 3 or 6 character hex color.Return false otherwise.
function is_valid_hex_color( $string )
{
$return_value = false;
if( strlen( $string ) == 6 || strlen( $string ) == 3 ) {
if( preg_match( '/^[0-9a-fA-F]+$/', $string ) ) {
$return_value = true;
}
}
return $return_value;
}
#------------------------------------------------------------------------------
# Return a shortened version of a FQDN
# if "hostname" is numeric only, assume it is an IP instead
#
function strip_domainname( $hostname ) {
$postition = strpos($hostname, '.');
$name = substr( $hostname , 0, $postition );
if ( FALSE === $postition || is_numeric($name) ) {
return $hostname;
} else {
return $name;
}
}
#------------------------------------------------------------------------------
# Read a file containing key value pairs
function file_to_hash($filename, $sep)
{
$lines = file($filename, FILE_IGNORE_NEW_LINES);
foreach ($lines as $line)
{
list($k, $v) = explode($sep, rtrim($line));
$params[$k] = $v;
}
return $params;
}
#------------------------------------------------------------------------------
# Read a file containing key value pairs
# Multiple values permitted for each key
function file_to_hash_multi($filename, $sep)
{
$lines = file($filename);
foreach ($lines as $line)
{
list($k, $v) = explode($sep, rtrim($line));
$params[$k][] = $v;
}
return $params;
}
#------------------------------------------------------------------------------
# Obtain a list of distinct values from an array of arrays
function hash_get_distinct_values($h)
{
$values = array();
$values_done = array();
foreach($h as $k => $v)
{
if($values_done[$v] != "x")
{
$values_done[$v] = "x";
$values[] = $v;
}
}
return $values;
}
$filter_defs = array();
#------------------------------------------------------------------------------
# Scan $conf['filter_dir'] and populate $filter_defs
function discover_filters()
{
global $conf, $filter_defs;
# Check whether filtering is configured or not
if(!isset($conf['filter_dir']))
return;
if(!is_dir($conf['filter_dir']))
{
error_log("discover_filters(): not a directory: ${conf['filter_dir']}");
return;
}
if($dh = opendir($conf['filter_dir']))
{
while(($filter_conf_filename = readdir($dh)) !== false) {
if(!is_dir($filter_conf_filename))
{
# Parse the file contents
$full_filename = "${conf['filter_dir']}/$filter_conf_filename";
$filter_params = file_to_hash($full_filename, '=');
$filter_shortname = $filter_params["shortname"];
$filter_type = $filter_params["type"];
if($filter_type = "url")
{
$filter_data_url = $filter_params['url'];
$filter_defs[$filter_shortname] = $filter_params;
$filter_defs[$filter_shortname]["data"] = file_to_hash($filter_data_url, ',');
$filter_defs[$filter_shortname]["choices"] = hash_get_distinct_values($filter_defs[$filter_shortname]["data"]);
}
}
}
closedir($dh);
}
}
$filter_permit_list = NULL;
#------------------------------------------------------------------------------
# Initialise the filter permit list, if necessary
function filter_init()
{
global $conf, $filter_permit_list, $filter_defs, $choose_filter;
if(!is_null($filter_permit_list))
{
return;
}
if(!isset($conf['filter_dir']))
{
$filter_permit_list = FALSE;
return;
}
$filter_permit_list = array();
$filter_count = 0;
foreach($choose_filter as $filter_shortname => $filter_choice)
{
if($filter_choice == "")
continue;
$filter_params = $filter_defs[$filter_shortname];
if($filter_count == 0)
{
foreach($filter_params["data"] as $key => $value)
{
if($value == $filter_choice)
$filter_permit_list[$key] = $key;
}
}
else
{
foreach($filter_permit_list as $key => $value)
{
$remove_key = TRUE;
if(isset($filter_params["data"][$key]))
{
if($filter_params["data"][$key] == $filter_choice)
{
$remove_key = FALSE;
}
}
if($remove_key)
{
unset($filter_permit_list[$key]);
}
}
}
$filter_count++;
}
if($filter_count == 0)
$filter_permit_list = FALSE;
}
#------------------------------------------------------------------------------
# Decide whether the given source is permitted by the filters, if any
function filter_permit($source_name)
{
global $filter_permit_list;
filter_init();
# Handle the case where filtering is not active
if(!is_array($filter_permit_list))
return true;
return isset($filter_permit_list[$source_name]);
}
///////////////////////////////////////////////////////////////////////////////
// Get all the available views
///////////////////////////////////////////////////////////////////////////////
function get_available_views() {
global $conf;
/* -----------------------------------------------------------------------
Find available views by looking in the GANGLIA_DIR/conf directory
anything that matches view_*.json. Read them all and build a available_views
array
----------------------------------------------------------------------- */
$available_views = array();
if ($handle = opendir($conf['views_dir'])) {
while (false !== ($file = readdir($handle))) {
if ( preg_match("/^view_(.*)\.json$/", $file, $out) ) {
$view_config_file = $conf['views_dir'] . "/" . $file;
if ( ! is_file ($view_config_file) ) {
echo("Can't read view config file " . $view_config_file . ". Please check permissions");
}
$view = json_decode(file_get_contents($view_config_file), TRUE);
// Check whether view type has been specified ie. regex.
// If not it's standard view
$view_type =
isset($view['view_type']) ? $view['view_type'] : "standard";
$default_size = isset($view['default_size']) ?
$view['default_size'] : $conf['default_view_graph_size'];
$available_views[] = array ("file_name" => $view_config_file,
"view_name" => $view['view_name'],
"default_size" => $default_size,
"items" => $view['items'],
"view_type" => $view_type);
unset($view);
}
}
closedir($handle);
}
foreach ($available_views as $key => $row) {
$name[$key] = strtolower($row['view_name']);
}
@array_multisort($name,SORT_ASC, $available_views);
return $available_views;
}
///////////////////////////////////////////////////////////////////////////////
// Get image graph URLS
// This function returns an array of graph URLs to be used when rendering the
// view. It returns only the base ie. cluster, host, metric information.
// It is up to the caller to add proper size information, time ranges etc.
///////////////////////////////////////////////////////////////////////////////
function get_view_graph_elements($view) {
global $conf, $index_array;
retrieve_metrics_cache();
$view_elements = array();
// set the default size from the view or global config
if ( isset($conf['default_view_graph_size']) ) {
$default_size = $conf['default_view_graph_size'];
}
if ( isset($view['default_size']) ) {
$default_size = $view['default_size'];
}
switch ( $view['view_type'] ) {
case "standard":
// Does view have any items/graphs defined
if ( sizeof($view['items']) == 0 ) {
continue;
// print "No graphs defined for this view. Please add some";
} else {
// Loop through graph items
foreach ( $view['items'] as $item_id => $item ) {
// Check if item is an aggregate graph
if ( isset($item['aggregate_graph']) ) {
foreach ( $item['host_regex'] as $reg_id => $regex_array ) {
$graph_args_array[] = "hreg[]=" . urlencode($regex_array["regex"]);
}
if ( isset($item['metric_regex']) ) {
foreach ( $item['metric_regex'] as $reg_id => $regex_array ) {
$graph_args_array[] = "mreg[]=" . urlencode($regex_array["regex"]);
$mreg[] = $regex_array["regex"];
}
}
if ( isset($item['size']) ) {
$graph_args_array[] = "z=" . $item['size'];
} else {
$graph_args_array[] = "z=" . $default_size;
}
// If graph type is not specified default to line graph
if ( isset($item['graph_type']) && in_array($item['graph_type'], array('line', 'stack') ) )
$graph_args_array[] = "gtype=" . $item['graph_type'];
else
$graph_args_array[] = "gtype=line";
if (isset($item['upper_limit']))
$graph_args_array[] = "x=" .$item['upper_limit'];
if (isset($item['lower_limit']))
$graph_args_array[] = "n=" .$item['lower_limit'];
if (isset($item['vertical_label']))
$graph_args_array[] = "vl=" .$item['vertical_label'];
if (isset($item['title']))
$graph_args_array[] = "title=" . urlencode($item['title']);
if ( isset($item['metric']) ) {
$graph_args_array[] = "m=" . $item['metric'];
}
if ( isset($item['glegend']) )
$graph_args_array[] = "glegend=" . $item["glegend"];
if ( isset($item['cluster']) ) {
$graph_args_array[] = "c=" . $item['cluster'];
}
if ( isset($item['exclude_host_from_legend_label']) ) {
$graph_args_array[] = "lgnd_xh=" . $item['exclude_host_from_legend_label'];
}
$graph_args_array[] = "aggregate=1";
$view_elements[] = array ( "graph_args" => join("&", $graph_args_array),
"aggregate_graph" => 1,
"name" => isset($item['title']) && $item['title'] != "" ? $item['title'] : $mreg[0] . " Aggregate graph"
);
unset($graph_args_array);
// It's standard metric graph
} else {
// Is it a metric or a graph(report)
if ( isset($item['metric']) ) {
$graph_args_array[] = "m=" . $item['metric'];
$name = $item['metric'];
} else {
$graph_args_array[] = "g=" . urlencode($item['graph']);
$name = $item['graph'];
}
if ( isset($item['size']) ) {
$graph_args_array[] = "z=" . $item['size'];
} else {
$graph_args_array[] = "z=" . $default_size;
}
if (isset($item['hostname'])) {
$hostname = $item['hostname'];
$cluster = array_key_exists($hostname, $index_array['cluster']) ?
$index_array['cluster'][$hostname] : NULL;
} else if (isset($item['cluster'])) {
$hostname = "";
$cluster = $item['cluster'];
} else {
$hostname = "";
$cluster = "";
}
$graph_args_array[] = "h=$hostname";
$graph_args_array[] = "c=$cluster";
if (isset($item['vertical_label']))
$graph_args_array[] = "vl=" .$item['vertical_label'];
if (isset($item['title']))
$graph_args_array[] = "title=" . urlencode($item['title']);
$view_elements[] = array ( "graph_args" => join("&", $graph_args_array),
"hostname" => $hostname,
"cluster" => $cluster,
"name" => $name
);
unset($graph_args_array);
}
} // end of foreach ( $view['items']
} // end of if ( sizeof($view['items'])
break;
;;
///////////////////////////////////////////////////////////////////////////
// Currently only supports matching hosts.
///////////////////////////////////////////////////////////////////////////
case "regex":
foreach ( $view['items'] as $item_id => $item ) {
// Is it a metric or a graph(report)
if ( isset($item['metric']) ) {
$metric_suffix = "m=" . $item['metric'];
$name = $item['metric'];
} else {
$metric_suffix = "g=" . $item['graph'];
$name = $item['graph'];
}
// Find hosts matching a criteria
$query = $item['hostname'];
foreach ( $index_array['hosts'] as $key => $host_name ) {
if ( preg_match("/$query/", $host_name ) ) {
$cluster = $index_array['cluster'][$host_name];
$graph_args_array[] = "h=$host_name";
$graph_args_array[] = "c=$cluster";
$view_elements[] = array ( "graph_args" => $metric_suffix . "&" . join("&", $graph_args_array),
"hostname" => $host_name,
"cluster" => $cluster,
"name" => $name);
unset($graph_args_array);
}
}
} // end of foreach ( $view['items'] as $item_id => $item )
break;;
} // end of switch ( $view['view_type'] ) {
return ($view_elements);
}
function legendEntry($vname, $legend_items) {
$legend = "";
if (in_array("now", $legend_items))
$legend .= "VDEF:{$vname}_last={$vname},LAST ";
if (in_array("min", $legend_items))
$legend .= "VDEF:{$vname}_min={$vname},MINIMUM ";
if (in_array("avg", $legend_items))
$legend .= "VDEF:{$vname}_avg={$vname},AVERAGE ";
if (in_array("max", $legend_items))
$legend .= "VDEF:{$vname}_max={$vname},MAXIMUM ";
$terminate = FALSE;
if (in_array("now", $legend_items)) {
$legend .= "GPRINT:'{$vname}_last':'Now\:%5.1lf%s";
$terminate = TRUE;
}
if (in_array("min", $legend_items)) {
if ($terminate)
$legend .= "' ";
$legend .= "GPRINT:'{$vname}_min':'Min\:%5.1lf%s";
$terminate = TRUE;
}
if (in_array("avg", $legend_items)) {
if ($terminate)
$legend .= "' ";
$legend .= "GPRINT:'{$vname}_avg':'Avg\:%5.1lf%s";
$terminate = TRUE;
}
if (in_array("max", $legend_items)) {
if ($terminate)
$legend .= "' ";
$legend .= "GPRINT:'{$vname}_max':'Max\:%5.1lf%s";
$terminate = TRUE;
}
if ($terminate)
$legend .= "\\l' ";
return $legend;
}
/**
* Check if current user has a privilege (view, edit, etc) on a resource.
* If resource is unspecified, we assume GangliaAcl::ALL.
*
* Examples
* checkAccess( GangliaAcl::ALL_CLUSTERS, GangliaAcl::EDIT, $conf ); // user has global edit?
* checkAccess( GangliaAcl::ALL_CLUSTERS, GangliaAcl::VIEW, $conf ); // user has global view?
* checkAccess( $cluster, GangliaAcl::EDIT, $conf ); // user can edit current cluster?
* checkAccess( 'cluster1', GangliaAcl::EDIT, $conf ); // user has edit privilege on cluster1?
* checkAccess( 'cluster1', GangliaAcl::VIEW, $conf ); // user has view privilege on cluster1?
*/
function checkAccess($resource, $privilege, $conf) {
if(!is_array($conf)) {
trigger_error('checkAccess: $conf is not an array.', E_USER_ERROR);
}
if(!isSet($conf['auth_system'])) {
trigger_error("checkAccess: \$conf['auth_system'] is not defined.", E_USER_ERROR);
}
switch( $conf['auth_system'] ) {
case 'readonly':
$out = ($privilege == GangliaAcl::VIEW);
break;
case 'enabled':
// TODO: 'edit' needs to check for writeability of data directory. error log if edit is allowed but we're unable to due to fs problems.
$acl = GangliaAcl::getInstance();
$auth = GangliaAuth::getInstance();
if(!$auth->isAuthenticated()) {
$user = GangliaAcl::GUEST;
} else {
$user = $auth->getUser();
}
if(!$acl->has($resource)) {
$resource = GangliaAcl::ALL_CLUSTERS;
}
$out = false;
if($acl->hasRole($user)) {
$out = (bool) $acl->isAllowed($user, $resource, $privilege);
}
// error_log("checkAccess() user=$user, resource=$resource, priv=$privilege == $out");
break;
case 'disabled':
$out = true;
break;
default:
trigger_error( "Invalid value '".$conf['auth_system']."' for \$conf['auth_system'].", E_USER_ERROR );
return false;
}
return $out;
}
function viewId($view_name) {
$id = 'v_' . preg_replace('/[^a-zA-Z0-9_]/', '_', $view_name);
return $id;
}
///////////////////////////////////////////////////////////////////////////////
// Taken from
// http://au2.php.net/manual/en/function.json-encode.php#80339
// Pretty print JSON
///////////////////////////////////////////////////////////////////////////////
function json_prettyprint($json)
{
$tab = " ";
$new_json = "";
$indent_level = 0;
$in_string = false;
$len = strlen($json);
for($c = 0; $c < $len; $c++)
{
$char = $json[$c];
switch($char)
{
case '{':
case '[':
if(!$in_string)
{
$new_json .= $char . "\n" . str_repeat($tab, $indent_level+1);
$indent_level++;
}
else
{
$new_json .= $char;
}
break;
case '}':
case ']':
if(!$in_string)
{
$indent_level--;
$new_json .= "\n" . str_repeat($tab, $indent_level) . $char;
}
else
{
$new_json .= $char;
}
break;
case ',':
if(!$in_string)
{
$new_json .= ",\n" . str_repeat($tab, $indent_level);
}
else
{
$new_json .= $char;
}
break;
case ':':
if(!$in_string)
{
$new_json .= ": ";
}
else
{
$new_json .= $char;
}
break;
case '"':
if($c > 0 && $json[$c-1] != '\\')
{
$in_string = !$in_string;
}
default:
$new_json .= $char;
break;
}
}
return $new_json;
}
function ganglia_cache_metrics() {
global $conf, $index_array, $hosts, $grid, $clusters, $debug, $metrics;
if (!isset($debug)) { $debug = 0; }
if($conf['cachedata'] == 1 && file_exists($conf['cachefile'])) {
// check for the cached file
// snag it and return it if it is still fresh
$time_diff = time() - filemtime($conf['cachefile']);
$expires_in = $conf['cachetime'] - $time_diff;
if( $time_diff < $conf['cachetime']){
if ( $debug == 1 ) {
echo("DEBUG: Fetching data from cache. Expires in " . $expires_in . " seconds.\n");
}
$index_array = unserialize(file_get_contents($conf['cachefile']));
}