(dashboard, widgets) work in progress sys info widget backend

src/www/widgets/api/plugins/system.inc

+<?php
+/*
+    Copyright (C) 2016 Deciso B.V.
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+*/
+
+function system_api_cpu_stats()
+{
+    $cpustats = array();
+    // take a short snapshot to calculate cpu usage
+    $diff = array('user', 'nice', 'sys', 'intr', 'idle');
+    $cpuTicks1 = array_combine($diff, explode(" ", get_single_sysctl('kern.cp_time')));
+    usleep(100000);
+    $cpuTicks2 = array_combine($diff, explode(" ", get_single_sysctl('kern.cp_time')));
+    $totalStart = array_sum($cpuTicks1);
+    $totalEnd = array_sum($cpuTicks2);
+    if ($totalEnd <= $totalStart) {
+        // if for some reason the measurement is invalid, assume nothing has changed (all 0)
+        $totalEnd = $totalStart;
+    }
+    $cpustats['used'] = floor(100 * (($totalEnd - $totalStart) - ($cpuTicks2['idle'] - $cpuTicks1['idle'])) / ($totalEnd - $totalStart));
+    $cpustats['user'] = floor(100 * (($cpuTicks2['user'] - $cpuTicks1['user'])) / ($totalEnd - $totalStart));
+    $cpustats['nice'] = floor(100 * (($cpuTicks2['nice'] - $cpuTicks1['nice'])) / ($totalEnd - $totalStart));
+    $cpustats['sys'] = floor(100 * (($cpuTicks2['sys'] - $cpuTicks1['sys'])) / ($totalEnd - $totalStart));
+    $cpustats['intr'] = floor(100 * (($cpuTicks2['intr'] - $cpuTicks1['intr'])) / ($totalEnd - $totalStart));
+    $cpustats['idle'] = floor(100 * (($cpuTicks2['idle'] - $cpuTicks1['idle'])) / ($totalEnd - $totalStart));
+
+    // cpu model and count
+    $cpustats['model'] = get_single_sysctl("hw.model");
+    $cpustats['cpus'] = get_single_sysctl('kern.smp.cpus');
+
+    // cpu frequency
+    $tmp = get_single_sysctl('dev.cpu.0.freq_levels');
+    $cpustats['max.freq'] = !empty($tmp) ? explode("/", explode(" ", $tmp)[0])[0] : "-";
+    $tmp = get_single_sysctl('dev.cpu.0.freq');
+    $cpustats['cur.freq'] = !empty($tmp) ? $tmp : "-";
+    $cpustats['freq_translate'] = sprintf(gettext("Current: %s MHz, Max: %s MHz"), $cpustats['cur.freq'], $cpustats['max.freq']);
+
+    return $cpustats;
+}
+
+function system_api_config()
+{
+    global $config;
+    $result = array();
+    $result['last_change'] = isset($config['revision']['time']) ? intval($config['revision']['time']) : 0;
+    $result['last_change_frmt'] = date("D M j G:i:s T Y", $result['last_change']);
+    return $result;
+}
+
+function system_api_kernel()
+{
+    global $config;
+    $result = array("pf" => array());
+    $result['pf']['maxstates'] = !empty($config['system']['maximumstates']) ? $config['system']['maximumstates'] : default_state_size();
+    exec('/sbin/pfctl -si |grep "current entries" 2>/dev/null', $states);
+    $result['pf']['states'] = count($states) >  0 ? filter_var($states[0], FILTER_SANITIZE_NUMBER_INT) : 0;
+    return $result;
+}
+
+/**
+ * widget system data
+ */
+function system_api()
+{
+    $result = array();
+
+    $result['cpu'] = system_api_cpu_stats();
+    preg_match("/sec = (\d+)/", get_single_sysctl("kern.boottime"), $matches);
+    $result['uptime'] = time() - $matches[1];
+    $result['date_frmt'] = date("D M j G:i:s T Y");
+    $result['config'] = system_api_config();
+    $result['kernel'] = system_api_kernel();
+
+    return $result;
+}