Rrdcached application monitoring

Can collect data from the agent or by connecting directly

includes/polling/applications/rrdcached.inc.php

@@ -0,0 +1,77 @@
+<?php
+
+echo " rrdcached";
+
+$data = "";
+
+if($agent_data['app']['rrdcached']) {
+    $data = $agent_data['app']['rrdcached'];
+} else {
+    d_echo("\nNo Agent Data. Attempting to connect directly to the rrdcached server ".$device['hostname'].":42217\n");
+
+    $sock = fsockopen($device['hostname'], 42217, $errno, $errstr, 5);
+
+    if(!$sock && $device['hostname'] == 'localhost') {
+        if (file_exists('/var/run/rrdcached.sock')) {
+	    $sock = fsockopen('unix:///var/run/rrdcached.sock');
+	} elseif (file_exists('/run/rrdcached.sock')) {
+	    $sock = fsockopen('unix:///run/rrdcached.sock');
+        } elseif (file_exists('/tmp/rrdcached.sock')) {
+	    $sock = fsockopen('unix:///tmp/rrdcached.sock');
+        }
+    }
+
+    if($sock) {
+        fwrite($sock, "STATS\n");
+        $max = -1;
+        $count = 0;
+        while ($max == -1 || $count < $max) {
+            $data .= fgets($sock, 128);
+            if ($max == -1) {
+                $max = explode(' ', $data)[0] + 1;
+            }
+            $count++;
+        }
+        fclose($sock);
+    } else {
+        d_echo("ERROR: $errno - $errstr\n");
+    }
+}
+
+$rrd_filename = $config['rrd_dir'].'/'.$device['hostname'].'/app-rrdcached-'.$app['app_id'].'.rrd';
+
+
+if (!is_file($rrd_filename)) {
+    rrdtool_create(
+        $rrd_filename,
+        '--step 300
+        DS:queue_length:GAUGE:600:0:U
+        DS:updates_received:COUNTER:600:0:U
+        DS:flushes_received:COUNTER:600:0:U
+        DS:updates_written:COUNTER:600:0:U
+        DS:data_sets_written:COUNTER:600:0:U
+        DS:tree_nodes_number:GAUGE:600:0:U
+        DS:tree_depth:GAUGE:600:0:U
+        DS:journal_bytes:COUNTER:600:0:U
+        DS:journal_rotate:COUNTER:600:0:U
+        '.$config['rrd_rra']
+    );
+}
+$fields = array();
+foreach (explode("\n", $data) as $line) {
+    $split = explode(': ', $line);
+    if (count($split) == 2) {
+        $name = strtolower(preg_replace('/[A-Z]/', '_$0', lcfirst($split[0])));
+        $fields[$name] = $split[1];
+    }
+}
+
+rrdtool_update($rrd_filename, $fields);
+
+$tags = array('name' => 'rrdcached', 'app_id' => $app['app_id']);
+influx_update($device,'app',$tags,$fields);
+
+unset($data);
+unset($rrd_filename);
+unset($fields);
+unset($tags);