WIP Dashboard

dashboard/README.md

@@ -0,0 +1,3 @@
+# Dashboard
+
+Allows using a tablet, smartphone, ebook reader or any other low-power internet-connected hardware as system monitor for an host on the same network.

dashboard/dashboard.cfg.example

@@ -0,0 +1,95 @@
+[DEFAULT]
+
+# The webpage will be available at http://this.host.ip.address:PORT
+PORT=8080
+
+# The webpage will be updated every REFRESH_SECONDS. Set to 0 to disable autorefresh.
+REFRESH_SECONDS=1
+
+#### SENSORS ####
+# Every sensor value is obtained on a command being executed, its result being parsed with a regexp
+# to extract (as a single group) the numeric or string value, and the value being used to plot the
+# graph. This sensor definitions are ready to be used, just enable the ones you need.
+# You can add your own declaring another section like this:
+#
+# [my_sensor]
+# DISABLED=False
+# COMMAND=/my/custom/binary --with parameters
+# REGEXP=my regex to parse (awesome|disappointing) command output
+# TYPE=TIMEGRAPH # May also be GRAPH or ERROR
+
+[system_load_1min]
+# The system load average in the last minute
+DISABLED=True
+COMMAND=uptime
+REGEXP=.*load average: (\d+[,.]\d+), \d+[,.]\d+, \d+[,.]\d+
+TYPE=TIMEGRAPH
+
+[system_load_5min]
+# The system load average in the last 5 minutes
+DISABLED=True
+COMMAND=uptime
+REGEXP=.*load average: \d+[,.]\d+, (\d+[,.]\d+), \d+[,.]\d+
+TYPE=TIMEGRAPH
+
+[system_load_15min]
+# The system load average in the last 15 minutes
+DISABLED=True
+COMMAND=uptime
+REGEXP=.*load average: \d+[,.]\d+, \d+[,.]\d+, (\d+[,.]\d+)
+TYPE=TIMEGRAPH
+
+[used_disk_space]
+# Used disk space in percent
+DISABLED=True
+COMMAND=df -h /dev/sda1
+REGEXP=(\d{1,3})%
+TYPE=GRAPH
+
+[raid_status]
+# Raid status
+DISABLED=True
+COMMAND=cat /proc/mdstat
+REGEXP=.*\] \[([U_]+)\]\n
+TYPE=ERROR
+
+[laptop_charger_disconnected]
+# Laptop charger disconnected
+# For laptops used as servers, apparently common among the self hosters. Requires acpi package installed.
+DISABLED=True
+COMMAND=acpi -a
+REGEXP=Adapter \d: (.+)
+TYPE=ERROR
+
+[free_ram]
+# Free ram in %
+# Shows another approach: does all the computation in the command and picks up
+# all the output (by not declaring a regexp).
+DISABLED=True
+COMMAND=free | grep Mem | awk '{print int($4/$2 * 100.0)}'
+TYPE=TIMEGRAPH
+
+[available_ram]
+# Like Free ram, but shows available instead of free. You may want to use this if you use a memcache.
+DISABLED=True
+COMMAND=free | grep Mem | awk '{print int($7/$2 * 100.0)}'
+TYPE=TIMEGRAPH
+
+[cpu_temperature]
+# CPU Temperature alarm: requires lm-sensors installed and configured (check your distribution's guide)
+# The regexp must be adapted to your configuration: run `sensors` in the command line
+# to find the name of the temperature sensor in your system. In this case is `Core 0`,
+# but may be called Tdie or a lot of different names, there is no standard.
+DISABLED=True
+COMMAND=sensors
+REGEXP=Core 0: +\+?(-?\d{1,3}).\d°[CF]
+TYPE=TIMEGRAPH
+
+[fan_speed]
+# Fan speed alarm: requires lm-sensors installed and configured (check your distribution's guide)
+# The regexp must be adapted to your configuration: run `sensors` in the command line
+# to find the name of the fan speed sensor in your system.
+DISABLED=True
+COMMAND=sensors
+REGEXP=cpu_fan: +(\d) RPM
+TYPE=TIMEGRAPH

dashboard/dashboard.py

@@ -0,0 +1,117 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import time
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import logging
+import traceback
+import re
+import locale
+import subprocess
+import configparser
+
+
+""" @package docstring
+Resources dashboard
+
+Starts a webserver on a specific port of the monitored server and serves a simple webpage containing
+the monitored sensors graphs.
+
+Installation:
+- Copy dashboard.cfg in /usr/local/etc/dashboard.cfg and customize it
+- Copy dashboard.py in /usr/local/bin/dashboard.py
+
+Usage:
+Start the server:
+/usr/local/bin/dashboard.py /usr/local/etc/dashboard.cfg
+
+@author Daniele Verducci <daniele.verducci@ichibi.eu>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+"""
+
+
+NAME = 'dashboard'
+VERSION = '0.1'
+DESCRIPTION = 'A simple system resources dashboard'
+
+
+class WebServer(BaseHTTPRequestHandler):
+
+	def __init__(self, configPath):
+		''' Sets up locale (needed for parsing numbers) '''
+		# Get system locale from $LANG (i.e. "en_GB.UTF-8")
+		systemLocale = os.getenv('LANG')
+		if not systemLocale:
+			raise ValueError('System environment variabile $LANG is not set!')
+		
+		locale.setlocale(locale.LC_ALL, systemLocale)
+
+		''' Reads the config '''
+		self._log = logging.getLogger('main')
+
+		if not os.path.exists(configPath) or not os.path.isfile(configPath):
+			raise ValueError('configPath must be a file')
+
+		self.config = configparser.ConfigParser(interpolation=None)	# Disable interpolation because contains regexp
+		self.config.read(configPath)
+		self.hostname = os.uname()[1]
+
+	def do_GET(self):
+		self.readSensors()
+
+		self.send_response(200)
+		self.send_header("Content-type", "text/html")
+		self.end_headers()
+		self.wfile.write(bytes("<html><head><title>https://pythonbasics.org</title></head>", "utf-8"))
+		self.wfile.write(bytes("<p>Request: %s</p>" % self.path, "utf-8"))
+		self.wfile.write(bytes("<body>", "utf-8"))
+		self.wfile.write(bytes("<p>This is an example web server.</p>", "utf-8"))
+		self.wfile.write(bytes("</body></html>", "utf-8"))
+
+	def readSensors():
+		return
+
+if __name__ == '__main__':
+	import argparse
+
+	parser = argparse.ArgumentParser(
+		prog = NAME + '.py',
+		description = NAME + ' ' + VERSION + '\n' + DESCRIPTION,
+		formatter_class = argparse.RawTextHelpFormatter
+	)
+	parser.add_argument('configFile', help="configuration file path")
+	parser.add_argument('-q', '--quiet', action='store_true', help="suppress non-essential output")
+	args = parser.parse_args()
+
+	if args.quiet:
+		level = logging.WARNING
+	else:
+		level = logging.INFO
+	logging.basicConfig(level=level)
+
+	port = 
+	httpd = HTTPServer(('localhost', port), Server)
+    logging.info('Serving on port {}'.format(port))
+    try:
+        httpd.serve_forever()
+    except KeyboardInterrupt:
+        pass
+	except Exception as e:
+		logging.critical(traceback.format_exc())
+		print('ERROR: {}'.format(e))
+		sys.exit(1)
+	finally:
+		httpd.server_close()
+
+	sys.exit(0)

healthcheck/healthcheck.cfg.example

@@ -43,8 +43,6 @@ MAILTO=root@localhost, user@localhost
 # Every health check is based on a command being executed, its result being parsed with a regexp
 # to extract (as a single group) the numeric or string value, and the value being compared with
 # a configured value. This checks are ready to be used, just enable the ones you need.
-#
-# CUSTOM CHECKS:
 # You can add your own custom check declaring another section like this:
 #
 # [my_custom_check_name]
@@ -57,12 +55,6 @@ MAILTO=root@localhost, user@localhost
 # ALARM_VALUE_LESS_THAN=12
 # COMMAND=/my/custom/binary --with parameters
 # REGEXP=my regex to parse (awesome|disappointing) command output
-#
-# First test your custom command executing it in the command line
-# Take the text output and write a regex to match it. Check every case:
-# success result, error result, command failure. Then paste the command
-# and regex in this config, enable the check and run to verify is working.
-
 
 [system_load_1min]
 # The system load average in the last minute
@@ -71,7 +63,6 @@ ALARM_VALUE_MORE_THAN=1.0
 COMMAND=uptime
 REGEXP=.*load average: (\d+[,.]\d+), \d+[,.]\d+, \d+[,.]\d+
 
-
 [system_load_5min]
 # The system load average in the last 5 minutes
 DISABLED=True
@@ -79,7 +70,6 @@ ALARM_VALUE_MORE_THAN=1.0
 COMMAND=uptime
 REGEXP=.*load average: \d+[,.]\d+, (\d+[,.]\d+), \d+[,.]\d+
 
-
 [system_load_15min]
 # The system load average in the last 15 minutes
 DISABLED=True
@@ -87,7 +77,6 @@ ALARM_VALUE_MORE_THAN=1.0
 COMMAND=uptime
 REGEXP=.*load average: \d+[,.]\d+, \d+[,.]\d+, (\d+[,.]\d+)
 
-
 [used_disk_space]
 # Used disk space (in percent, i.e. ALARM_VALUE_MORE_THAN=75 -> alarm if disk is more than 75% full)
 DISABLED=True
@@ -95,7 +84,6 @@ ALARM_VALUE_MORE_THAN=75
 COMMAND=df -h /dev/sda1
 REGEXP=(\d{1,3})%
 
-
 [raid_status]
 # Issues an alarm when the raid is corrupted
 # Checks this part of the /proc/mdstat file:
@@ -107,7 +95,6 @@ ALARM_STRING_NOT_EQUAL=UU
 COMMAND=cat /proc/mdstat
 REGEXP=.*\] \[([U_]+)\]\n
 
-
 [battery_level]
 # Issues an alarm when battery is discharging below a certain level (long blackout, pulled power cord...)
 # For laptops used as servers, apparently common among the self hosters. Requires acpi package installed.
@@ -117,7 +104,6 @@ COMMAND=acpi -b
 REGEXP=Battery \d: .*, (\d{1,3})%
 ALARM_VALUE_LESS_THAN=90
 
-
 [laptop_charger_disconnected]
 # Issues an alarm when laptop charger is disconnected
 # For laptops used as servers, apparently common among the self hosters. Requires acpi package installed.
@@ -126,7 +112,6 @@ COMMAND=acpi -a
 REGEXP=Adapter \d: (.+)
 ALARM_STRING_EQUAL=off-line
 
-
 [free_ram]
 # Free ram in %
 # Shows another approach: does all the computation in the command and picks up
@@ -135,14 +120,12 @@ DISABLED=True
 COMMAND=free | grep Mem | awk '{print int($4/$2 * 100.0)}'
 ALARM_VALUE_LESS_THAN=20
 
-
 [available_ram]
 # Like Free ram, but shows available instead of free. You may want to use this if you use a memcache.
 DISABLED=True
 COMMAND=free | grep Mem | awk '{print int($7/$2 * 100.0)}'
 ALARM_VALUE_LESS_THAN=20
 
-
 [cpu_temperature]
 # CPU Temperature alarm: requires lm-sensors installed and configured (check your distribution's guide)
 # The regexp must be adapted to your configuration: run `sensors` in the command line
@@ -153,7 +136,6 @@ ALARM_VALUE_MORE_THAN=80
 COMMAND=sensors
 REGEXP=Core 0: +\+?(-?\d{1,3}).\d°[CF]
 
-
 [fan_speed]
 # Fan speed alarm: requires lm-sensors installed and configured (check your distribution's guide)
 # The regexp must be adapted to your configuration: run `sensors` in the command line
@@ -162,31 +144,3 @@ DISABLED=True
 ALARM_VALUE_LESS_THAN=300
 COMMAND=sensors
 REGEXP=cpu_fan: +(\d) RPM
-
-
-[host_reachability]
-# Check if a remote host is alive with Ping. You can replace the ip with a domain name (e.g. COMMAND=ping debian.org -c 1)
-#
-# Shows another approach: uses the return value to print a string. Leverages ping's ability to return different error codes:
-# 0 = success
-# 1 = the host is unreachable
-# 2 = an error has occurred (and will be logged to stderr)
-# We are throwing away stdout and replacing it with a custom text.
-# If there is a different text (the stderr), something bad happened, and it will be reported in the mail.
-DISABLED=True
-ALARM_STRING_NOT_EQUAL=Online
-COMMAND=ping 192.168.1.123 -c 1 > /dev/null && echo "Online" || echo "Offline"
-
-
-[service_webserver]
-# Check if a webserver is running on port 80. You can replace the ip with a domain name.
-# You can check different services changing the port number. Some examples:
-# 80 HTTP Webserver
-# 443 HTTPS Webserver
-# 21 FTP
-# 22 SSH
-# 5900 VNC (Linux remote desktop)
-# 3389 RDP (Windows remote desktop)
-DISABLED=True
-ALARM_STRING_NOT_EQUAL=Online
-COMMAND=nc -z -w 3 192.168.1.123 80 > /dev/null && echo "Online" || echo "Offline"

healthcheck/healthcheck.py

@@ -112,15 +112,12 @@ class Main:
 		stdout = ""
 		ret = subprocess.run(config.command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
 		if ret.stderr:
-			self._log.info('{} subprocess stderr:\n{}'.format(config.command, ret.stderr.decode()))
+			self._log.info('{} subprocess stderr:\n{}', config.command, ret.stderr.decode())
 		if ret.stdout:
 			stdout = ret.stdout.decode()
-			self._log.debug('{} subprocess stdout:\n{}'.format(config.command, stdout))
+			self._log.debug('{} subprocess stdout:\n{}', config.command, stdout)
 		if ret.returncode != 0:
-			return 'the command exited with error code {} {}'.format(
-				ret.returncode,
-				'and error message "{}"'.format(ret.stderr.decode().strip()) if ret.stderr else ''
-			)
+			return 'subprocess {} exited with error code {}'.format(config.command, ret.returncode)
 		
 		# Parse result with regex
 		match = re.search(config.regexp, stdout, re.MULTILINE)