smart-top/src/monitor.py

"""
    This program is designed to inspect an application environment
    This program should only be run on unix friendly systems
    
"""
from __future__  import division
import os
import subprocess
from sets import Set
import re

class Analysis:
	def __init__(self):
		self.logs = []
		pass
	def post(self,object):
		self.logs.append(object)
"""
	This class is designed to analyze environment variables. Environment variables can either be folders, files or simple values
	The class returns a quantifiable assessment of the environment variables (expected 100%)
"""
class Env(Analysis):
	def __init__(self,values):
		Analysis.__init__(self)
		self.values = values
	"""
		This function evaluate the validity of an environment variable by returning a 1 or 0 (computable)
		The function will use propositional logic (https://en.wikipedia.org/wiki/Propositional_calculus)
	"""
	def evaluate(self,id):
		
		if id in os.environ :
			#
			# We can inspect to make sure the environment variable is not a path or filename.
			# Using propositional logic we proceed as follows:
			# 	- (p) We determine if the value is an folder or file name (using regex)
			# 	- (q) In case of a file or folder we check for existance
			# The final result is a conjuction of p and q
			#
			value = os.environ[id]
			expressions = [os.sep,'(\\.\w+)$']
			p = sum([ re.search(xchar,value) is not None for xchar in expressions])
			q = os.path.exists(value)
			
			return int(p and q)
		else:
			return 0
	
	def composite (self):
		r = [ self.evaluate(id) for id in self.values] ;		
		N = len(r)
		n = sum(r)
class ProcessCounter(Analysis):
		#return [{"memory_usage":row[0],"cpu_usage":row[1],"memory_available":row[2]/1000,"label":row[3]} for row in ma]