basic layout of framewor; subject to change

app.py

@@ -0,0 +1,127 @@
+#!/usr/bin/python
+from time import time
+from os import getloadavg
+import logging #TODO be more precise
+#import pdb
+
+class probe(object):
+    """"
+        An atomic measurment
+
+        Consists of name, value and unit. Unit is optional, althought when
+        available it is highly recommended to state it; bd default it is set
+        to "".
+    """
+    def __init__(self, name, value, unit=""):
+        self.name = name
+        self.time = time()
+        self.value = value
+        self.unit = unit
+
+class survey(object):
+    """
+        A survey skeleton  - a survey is a probe container.
+
+        Inherit from this class if you want to create your on Survey. 
+        "Implement" update by any means.
+    """
+    def __init__(self):
+        self.probe = [] #just to let you know
+        self.update()
+        self.name = 'Generic Survey'
+        
+    def update(self):
+        """
+            Updates the list of probes
+
+            Empty list of probes first and fill it with new ones afterwards
+        """
+        pass 
+    
+class display(object):
+    """
+        A display skeleton - a display updates and displays surveys
+        
+        Inherit from this class if you want to create your own display
+        Implement display.
+    """
+    def __init__(self):
+        self.survey = []
+
+    def update(self):
+        for s in self.survey:
+           s.update()
+
+    def display(self):
+        """ 
+            Displays self.survey items
+            
+            Don't forget to add some surveys first and update them as needed
+        """
+        pass
+
+class surveyLoad(survey):
+    """ Surveys unix load average """
+    def __init__(self):
+        super(surveyLoad,self).__init__() #call superconstructor
+        self.name = 'Load Survey'
+
+    def update(self):
+        self.probe = []
+        try: 
+            self.load = getloadavg()
+            self.probe.append(probe('lastminute',self.load[0]))
+            self.probe.append(probe('last5minute',self.load[1]))
+            self.probe.append(probe('last15minute',self.load[2]))
+        except Exception, ex:
+            logging.exception("Error ocurred while probing %s" % self.__class__.__name__)
+            pass
+
+class surveyFree(survey):
+#TODO it's just a quick hack; might not work too well
+    """ Primitive memory survey"""
+    def __init__(self):
+        super(surveyFree,self).__init__()
+        self.name = 'Simple Memory Survey'
+    
+    def update(self):
+        self.probe = []
+        try:
+            f = open('/proc/meminfo', "r")
+            self.probe.append(self.parseline(f.next()))
+            self.probe.append(self.parseline(f.next()))
+            f.next() #skip Buffer
+            self.probe.append(self.parseline(f.next()))
+            f.close()
+            self.probe.append(probe("Effective free memory",
+                                     self.probe[1].value + self.probe[2].value, 'kb'))
+        except Exception, ex:
+            logging.exception("Error ocurred while probing %s" % self.__class__.__name__)
+            pass
+
+    def parseline(self, memline):
+        tmp = memline.partition(' ')
+        name = tmp[0].rstrip(':')
+        tmp = tmp[2].lstrip(' ').partition(' ')
+        value = int(tmp[0])
+        unit = tmp[2].rstrip('\n')
+        return probe(name,value,unit)
+
+
+class displaycli(display):
+    """ "Dumps" survey to standard out """
+    def display(self):
+        for s in self.survey:
+            s.update()
+            print "Name: %s" % s.name
+            for p in s.probe:
+                print "%s  \t%s %s" % (p.name,p.value,p.unit)
+            print ""
+
+if __name__ == "__main__":
+    dis = displaycli()
+    dis.survey.append(surveyLoad())
+    dis.survey.append(surveyLoad())
+    dis.survey.append(surveyFree())
+    dis.display()
+#pdb.set_trace()