2 files changed, 83 insertions, 0 deletions

diff --git a/inc/collectd.inc.php b/inc/collectd.inc.php
index 525b931..3ef9102 100644
--- a/inc/collectd.inc.php
+++ b/inc/collectd.inc.php
@@ -157,4 +157,85 @@ function build_url($base, $items, $s=86400) {
         return $base;
 }
 
+# generate identifier that collectd's FLUSH command understands
+function collectd_identifier($host, $plugin, $pinst, $type, $tinst) {
+        global $CONFIG;
+
+        $identifier = sprintf('%s/%s%s%s/%s%s%s', $host,
+                $plugin, strlen($pinst) ? '-' : '', $pinst,
+                $type, strlen($tinst) ? '-' : '', $tinst);
+
+        if (is_file($CONFIG['datadir'].'/'.$identifier.'.rrd'))
+                return $identifier;
+        else
+                return FALSE;
+}
+
+# tell collectd to FLUSH all data of the identifier(s)
+function collectd_flush($identifier) {
+        global $CONFIG;
+
+        if (!$CONFIG['socket'])
+                return FALSE;
+
+        if (!$identifier || (is_array($identifier) && count($identifier) == 0) ||
+                        !(is_string($identifier) || is_array($identifier)))
+                return FALSE;
+
+        $u_errno  = 0;
+        $u_errmsg = '';
+        if ($socket = @fsockopen($CONFIG['socket'], 0, $u_errno, $u_errmsg)) {
+                $cmd = 'FLUSH plugin=rrdtool';
+                if (is_array($identifier)) {
+                        foreach ($identifier as $val)
+                                $cmd .= sprintf(' identifier="%s"', $val);
+                } else
+                        $cmd .= sprintf(' identifier="%s"', $identifier);
+                $cmd .= "\n";
+
+                $r = fwrite($socket, $cmd, strlen($cmd));
+                if ($r === false || $r != strlen($cmd)) {
+                        printf('ERROR: Failed to write full command to unix-socket: %d out of %d written',
+                                $r === false ? -1 : $r, strlen($cmd));
+                        return FALSE;
+                }
+
+                $resp = fgets($socket);
+                if ($resp === false) {
+                        printf('ERROR: Failed to read response from collectd for command: %s',
+                                trim($cmd));
+                        return FALSE;
+                }
+
+                $n = (int)$resp;
+                while ($n-- > 0)
+                        fgets($socket);
+
+                fclose($socket);
+
+                return TRUE;
+        } else {
+                printf('ERROR: Failed to open unix-socket to collectd: %d: %s',
+                        $u_errno, $u_errmsg);
+                return FALSE;
+        }
+}
+
+# generate identifiers from args
+function ident_from_args($args) {
+        if (is_array($args['tinstance'])) {
+                foreach($args['tinstance'] as $ti) {
+                        $instances[] = collectd_identifier($args['host'],
+                                $args['plugin'], $args['pinstance'],
+                                $args['type'], $ti);
+                }
+        } else {
+                $instances[] = collectd_identifier($args['host'],
+                        $args['plugin'], $args['pinstance'],
+                        $args['type'], $args['tinstance']);
+        }
+
+        return $instances;
+}
+
 ?>
diff --git a/inc/html.inc.php b/inc/html.inc.php
index cbe3ad2..09da518 100644
--- a/inc/html.inc.php
+++ b/inc/html.inc.php
@@ -2,6 +2,7 @@
 
 require_once 'conf/common.inc.php';
 require_once 'inc/rrdtool.class.php';
+require_once 'inc/collectd.inc.php';
 
 function html_start() {
         global $CONFIG;
@@ -46,6 +47,7 @@ function host_summary($hosts) {
         echo "<table class=\"summary\">\n";
 
         foreach($hosts as $host) {
+                collectd_flush(sprintf('%s/load/load', $host));
                 $rrd_info = $rrd->rrd_info($CONFIG['datadir'].'/'.$host.'/load/load.rrd');
                 if (!$rrd_info)
                         continue;