[drupal] Pulling logger.drush.inc from the msg fork, thanks Ely!
This commit is contained in:
Bart Van Der Meerssche
parent
9eac97fe96
commit
5d1e0d6b61
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<?php
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/**
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* Callbacks for accessing RRDs.
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*
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* Copyright (c) 2008-2009 jokamajo.org
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* 2010-2011 Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
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* 2010 Fraunhofer Institut ITWM (www.itwm.fraunhofer.de)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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//Constants
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//Some constants need to be redefined because this file can be called from xmlrpc.php
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//drupal_get_path does not work, because xmlrpc.php is called from xmlrpc.php.
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define('ROOT_PATH', 'sites/all/modules/logger');
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define('RRDTOOL', ROOT_PATH . '/rrdtool');
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define('DATA_PATH', ROOT_PATH . '/data');
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define('SECOND', 1);
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define('MINUTE', 60);
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define('HOUR', 60 * MINUTE);
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define('DAY', 24 * HOUR);
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define('WEEK', 7 * DAY);
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define('MONTH', 30 * DAY);
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define('YEAR', 52 * WEEK);
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define('METER', 'meter');
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/**
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* Creates an RRD for storing sensors' measurements in minute resolution.
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*
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* @param $meter The sensor's id.
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* @return the creation command execution code.
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*/
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function logger_rrd_base_create($meter) {
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$step = 1 * MINUTE;
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$archives = logger_get_storage_periods();
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return _logger_rrd_create($meter, $step, 'DERIVE', $archives, 'base');
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}
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/**
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* Returns an array of measurement storage periods, indexed by time resolution.
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*
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* @return the array of storage periods.
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*/
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function logger_get_storage_periods() {
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return array(
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//resolution storage period
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1 * MINUTE => 1 * DAY,
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15 * MINUTE => 1 * WEEK,
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1 * DAY => 365 * DAY,
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1 * WEEK => 10 * YEAR);
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}
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/**
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* Creates an RRD for storing sensors' night measurements in daily resolution.
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*
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* @param $meter The sensor's id.
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* @return the creation command execution code.
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*/
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function logger_rrd_night_create($meter) {
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$step = 24 * HOUR;
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$archives = array(
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//resolution storage period
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1 * DAY => 365 * DAY,
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1 * WEEK => 10 * YEAR);
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return _logger_rrd_create($meter, $step, 'GAUGE', $archives, 'night');
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}
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/**
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* Creates an RRD for storing sensors' measurements.
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*
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* @param $meter The sensor's id.
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* @param $step The base interval in seconds with which data will be fed into the RRD.
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* @param $ds_type The RRD DS type.
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* @param $archives An array of RRD archives' properties formatted as (resolution => storage period).
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* @param $subdir The subdirectory where the rrd file should be placed. (NULL means the default location)
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* @return the creation command execution code.
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*/
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function _logger_rrd_create($meter, $step, $ds_type, $archives, $subdir) {
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$return = 0;
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$file_path = _logger_rrd_file($meter, $subdir);
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$start = 1199487600; //Fri, 04 Jan 2008 23:00:00 GMT
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$ds = _logger_rrd_meter_ds($ds_type);
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if (!file_exists($file_path)) {
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$command = RRDTOOL . " create $file_path " .
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"--start $start " .
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"--step $step " .
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"$ds " .
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_logger_rrd_rras($step, $archives);
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system($command, $return);
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}
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return $return;
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}
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/**
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* Creates a RRD DS definition.
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*
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* @param $type The DS type.
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* @return the DS definition.
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*/
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function _logger_rrd_meter_ds($type) {
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$name = METER;
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$timeout = 100 * DAY;
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$min = 0;
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$max = 20;
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return "DS:$name:$type:$timeout:$min:$max";
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}
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/**
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* Creates a list of RRD archives' definitions.
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*
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* @param $step The base interval in seconds with which data will be fed into the RRD.
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* @param $archives The array of RRD archives' properties formatted as (resolution => storage period).
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* @return the list of RRD archives' definitions.
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*/
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function _logger_rrd_rras($step, $archives) {
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$rras = '';
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foreach($archives as $resolution => $storage_period) {
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$rows = $resolution / $step;
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$slots = $storage_period / $resolution;
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$rras .= "RRA:AVERAGE:0.5:$rows:$slots ";
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}
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return $rras;
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}
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/**
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* Feeds the sensors' RRDs with night consumption.
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*
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* @param $meter The sensor's id.
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* @param $start The night period start time.
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* @param $end The night period end time.
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* @return the update command execution code.
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*/
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function logger_rrd_night_update($meter, $start, $end) {
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$file_path = _logger_rrd_file($meter);
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$resolution = 15 * MINUTE;
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$command = RRDTOOL . " fetch $file_path " .
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"AVERAGE " .
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"--resolution $resolution " .
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"--start $start " .
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"--end $end " .
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"| tail -n 12 | awk -F': ' '{SUM += $2} END {print SUM/12}'";
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$value = (float) shell_exec($command);
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return logger_rrd_update($meter, array($end => $value), 'night');
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}
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/**
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* Feeds the sensors' RRDs with measurements.
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*
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* @param $meter The sensor's id.
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* @param $values An array of measurements formatted as (timestamp => value).
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* @param $subdir The subdirectory where the rrd file is placed.
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* @return the update command execution code.
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*/
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function logger_rrd_update($meter, $values, $subdir = NULL) {
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$return = 0;
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$file_path = _logger_rrd_file($meter, $subdir);
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$command = RRDTOOL . " update $file_path ";
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ksort($values);
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foreach($values as $timestamp => $value) {
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$command .= " $timestamp:$value";
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}
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system($command, $return);
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return $return;
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}
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/**
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* Queries the RRDs for sensor's measurements.
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*
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* @param $interval The time interval. This argument is used to select the RRA.
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* @param $sensor The sensor.
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* @param $unit The power unit.
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* @param $offset The user timezone offset.
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* @param $period An array containing a period of time to be queried.
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* @param $step The amount of time aggregated in a single point.
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* @return the array of sensor's measurements.
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*/
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function logger_rrd_query_sensor($interval, $sensor, $unit, $offset, $period, $step) {
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$series_id = METER;
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$def = _logger_rrd_sensor_def($interval, $series_id, $sensor, $unit);
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$latest = _logger_rrd_latest_timestamp($interval, $sensor);
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return _logger_rrd_export($interval, $def, $series_id, $latest, $offset, true, $period, $step);
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}
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/**
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* Returns the timestamp of the latest update of a sensor.
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*
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* @param $interval The time interval.
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* @param $sensor The sensor.
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* @return the latest update timestamp.
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*/
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function _logger_rrd_latest_timestamp($interval, $sensor) {
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$file_path = _logger_rrd_file($sensor->meter, $interval);
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$command = RRDTOOL . " last $file_path";
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exec($command, $lines);
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return $lines[0];
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}
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/**
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* Queries the RRDs for sensors' aggregated measurements.
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*
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* @param $interval The time interval.
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* @param $sensors The array of sensors.
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* @param $unit The power unit.
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* @param $offset The user timezone offset.
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* @param $period An array containing a period of time to be queried.
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* @param $step The amount of time aggregated in a single point.
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* @return the array of sensor's measurements.
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*/
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function logger_rrd_query_agg($interval, $sensors, $unit, $offset, $period, $step) {
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//Latest measurements are not considered, in order to tolerate heartbeat delays.
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$end_time = time() - 15 * MINUTE;
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$def = "";
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$variables = "";
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$i = 1;
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foreach ($sensors as $sensor) {
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$sensor_cdef = METER . $i;
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$def .= _logger_rrd_sensor_def($interval, $sensor_cdef, $sensor, $unit) .
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//Considers unknown measurements to be zero
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"CDEF:completeseries$i=" . "$sensor_cdef,UN,0,$sensor_cdef,IF " .
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//Do not consider latest minutes
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"CDEF:filtered$i=TIME,$end_time,GT,UNKN,completeseries$i,IF ";
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$variables .= ($i > 1 ? ',' : '') . "filtered$i";
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$i++;
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}
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$operators = str_repeat(",+", count($sensors) - 1);
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$series_id = METER . '0';
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//Sum all measurements of a particular time
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$def .= "CDEF:$series_id=$variables$operators ";
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return _logger_rrd_export($interval, $def, $series_id, time(), $offset, false, $period, $step);
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}
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/**
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* Queries the total energy consumption during the specified time period, in watt-hour.
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*
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* @param $sensors The sensors whose measurements are to be summed up.
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* @param $unit The energy unit.
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* @param $interval The time interval menu option.
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* @param $offset The user timezone offset.
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* @param $period An array containing a period of time to be queried.
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* @param $step The amount of time aggregated in a single point.
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* @return the summed power consumption.
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*/
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function logger_rrd_query_energy($sensors, $unit, $interval, $offset, $period, $step) {
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$total = 0;
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foreach ($sensors as $sensor) {
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$measurements = logger_rrd_query_sensor($interval, $sensor, $unit, $offset, $period, $step);
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foreach($measurements as $timestamp => $value) {
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$total += $value * $step;
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}
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}
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return $total;
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}
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/**
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* Creates a DEF tag to represent sensor's measurements plotted in a chart series.
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*
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* @param $interval The time interval.
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* @param $series_id The series id.
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* @param $sensor The sensor.
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* @param $unit The unit.
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* @return the DEF tag.
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*/
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function _logger_rrd_sensor_def($interval, $series_id, $sensor, $unit) {
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global $user;
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$factor = _logger_rrd_get_factor($unit);
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if($sensor->private > 0 && $sensor->uid != $user->uid) {
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return null;
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}
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$file_path = _logger_rrd_file($sensor->meter, $interval);
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return "DEF:data$series_id=" . "$file_path:meter:AVERAGE " .
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"CDEF:$series_id=" . "data$series_id," . $factor . ",* ";
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}
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/**
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* Composes RRD file path.
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*
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* @param $meter The sensor id.
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* @param $interval The time interval.
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* @return the RRD file path.
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*/
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function _logger_rrd_file($meter, $interval) {
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$path = DATA_PATH . ($interval == 'night'? '/night' : '/base');
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return "$path/$meter.rrd";
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}
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/**
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* Exports the sensors' measurements from the RRDs to an array.
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*
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* @param $def The rrd def tag.
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* @param $exported_cdef The exported cdef.
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* @param $latest The latest update time.
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* @param $offset The user timezone offset.
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* @param $include_nan Whether NaN values should be included in the result.
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* @param $period An array containing a period of time to be queried.
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* @param $step The amount of time aggregated in a single point.
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* @return the array of sensors' measurements.
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*/
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function _logger_rrd_export($interval, $def, $exported_cdef, $latest, $offset, $include_nan, $period, $step) {
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if (!$def) {
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return array();
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}
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$start = $period['start'];
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$end = $period['end'];
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//time period MUST be within the RRA and both $start and $end must be multiples of $step
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$start = $start - ($start % $step);
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$end = $end - ($end % $step);
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$maxrows = 1 + ($end - $start) / $step;
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$maxrows = $maxrows < 10? 10: $maxrows; //RRDTool exports at least 8 rows
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$command = RRDTOOL . ' xport ' .
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"--start $start " .
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"--end $end " .
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"--step $step " .
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"--maxrows $maxrows " .
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"$def " .
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"XPORT:$exported_cdef";
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exec($command, $lines);
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return _logger_rrd_parse_exported_lines($lines, $offset);
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}
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/**
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* Parses output of command rrdtool xport into an array.
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*
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* @param $lines The lines to be exported.
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* @param $offset The user timezone offset.
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* @return the array of sensors' measurements.
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*/
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function _logger_rrd_parse_exported_lines($lines, $offset) {
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$data = array();
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foreach($lines as $line) {
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$line = strtolower($line);
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if (strpos($line, '<row>') > 0) {
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$line = str_replace(array('<row><t>', '</v></row>'), '', $line);
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$line = str_replace('</t><v>', ':', $line);
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$div_pos = strpos($line, ':');
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$timestamp = trim(substr($line, 0, $div_pos)) + $offset;
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$value = trim(substr($line, $div_pos + 1));
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if ($value == 'nan') {
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if ($include_nan) {
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$data[$timestamp] = null;
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}
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} else {
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$data[$timestamp] = $value;
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}
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}
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}
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return $data;
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}
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function _logger_rrd_get_factor($unit) {
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$factors = array(
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'kw' => 0.001,
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'kwh' => 31536,
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'eur' => 5676, // 18 EURcent/kWh
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'aud' => 5991, // 19 AUDcent/kWh
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'watt' => 3600, // 1Wh/s = 3600 W
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'Wh' => 1,
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'kWh' => 0.001
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);
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return $factors[$unit];
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}
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