add fritzbox memory usage plugin

fritzbox_memory_usage.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+"""
+  fritzbox_memory_usage - A munin plugin for Linux to monitor AVM Fritzbox
+  Copyright (C) 2015 Christian Stade-Schuldt
+  Author: Christian Stade-Schuldt
+  Like Munin, this plugin is licensed under the GNU GPL v2 license
+  http://www.opensource.org/licenses/GPL-2.0
+  Add the following section to your munin-node's plugin configuration:
+
+  [fritzbox_*]
+  env.fritzbox_ip [ip address of the fritzbox]
+  env.fritzbox_password [fritzbox password]
+  
+  This plugin supports the following munin configuration parameters:
+  #%# family=auto contrib
+  #%# capabilities=autoconf
+"""
+
+import hashlib
+import httplib
+import os
+import re
+import sys
+import fritzbox_helper as fh
+from io import StringIO, BytesIO
+
+PAGE = '/system/ecostat.lua'
+pattern = re.compile('.*\/(StatRAM.*?)".*=.*"(.*?)"')
+USAGE_MAPPING = {'StatRAMCacheUsed': 'cache', 'StatRAMPhysFree': 'free', 'StatRAMStrictlyUsed': 'strict'}
+
+
+def get_memory_usage():
+    """get the current memory usage"""
+    
+    server = os.environ['fritzbox_ip']
+    password = os.environ['fritzbox_password']
+    
+    sid = fh.get_sid(server, password)
+    data = fh.get_page(server, sid, PAGE)
+    matches = re.finditer(pattern, data)
+    if matches:
+        for m in matches:
+            print'%s.value %d' %  (USAGE_MAPPING[m.group(1)], int(m.group(2).split(',')[0]))
+
+
+def print_config():
+    print "graph_title AVM Fritz!Box Memory"
+    print "graph_vlabel %"
+    print "graph_args --base 1000 -r --lower-limit 0 --upper-limit 100"
+    print "graph_category system"
+    print "graph_order strict cache free"
+    print "graph_info This graph shows what the Fritzbox uses memory for."
+    print "graph_scale no"
+    print "strict.label strict"
+    print "strict.type GAUGE"
+    print "strict.draw AREA"
+    print "cache.label cache"
+    print "cache.type GAUGE"
+    print "cache.draw STACK"
+    print "free.label free"
+    print "free.type GAUGE"
+    print "free.draw STACK"
+
+
+if __name__ == '__main__':
+    if len(sys.argv) == 2 and sys.argv[1] == 'config':
+        print_config()
+    elif len(sys.argv) == 2 and sys.argv[1] == 'autoconf':
+        print 'yes'
+    elif len(sys.argv) == 1 or len(sys.argv) == 2 and sys.argv[1] == 'fetch':
+    # Some docs say it'll be called with fetch, some say no arg at all
+        try:
+            get_memory_usage()
+        except:
+            sys.exit("Couldn't retrieve fritzbox memory usage")