From 65ced99bd502d7865074be46d26bed301c805847 Mon Sep 17 00:00:00 2001
From: Stephen Soltesz <soltesz@cs.princeton.edu>
Date: Fri, 1 Aug 2008 20:37:43 +0000
Subject: [PATCH] renamed from 'soltesz' to reflect it's function and content. 
 Should be able to hide the re-implementation of some of the backend
 ultimately.

---
 database.py | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 database.py

diff --git a/database.py b/database.py
new file mode 100644
index 0000000..14fc0e3
--- /dev/null
+++ b/database.py
@@ -0,0 +1,154 @@
+import os
+import sys
+import pickle
+noserial=False
+try:
+	from PHPSerialize import *
+	from PHPUnserialize import *
+except:
+	#print >>sys.stderr, "PHPSerial db type not allowed."
+	noserial=True
+
+import inspect
+import shutil
+from config import config as cfg
+config = cfg()
+
+import monitorconfig
+
+DEBUG= 0
+PICKLE_PATH=monitorconfig.MONITOR_DATA_ROOT
+
+class ExceptionTimeout(Exception): pass
+
+def dbLoad(name, type=None):
+	return SPickle().load(name, type)
+
+def dbExists(name, type=None):
+	#if self.config.debug:
+	#	name = "debug.%s" % name
+	return SPickle().exists(name, type)
+
+def dbDump(name, obj=None, type=None):
+	# depth of the dump is 2 now, since we're redirecting to '.dump'
+	return SPickle().dump(name, obj, type, 2)
+
+def if_cached_else_refresh(cond, refresh, name, function, type=None):
+	s = SPickle()
+	if refresh:
+		if not config.debug and s.exists("production.%s" % name, type):
+			s.remove("production.%s" % name, type)
+		if config.debug and s.exists("debug.%s" % name, type):
+			s.remove("debug.%s" % name, type)
+
+	return if_cached_else(cond, name, function, type)
+
+def if_cached_else(cond, name, function, type=None):
+	s = SPickle()
+	if (cond and s.exists("production.%s" % name, type)) or \
+	   (cond and config.debug and s.exists("debug.%s" % name, type)):
+		o = s.load(name, type)
+	else:
+		o = function()
+		if cond:
+			s.dump(name, o, type)	# cache the object using 'name'
+			o = s.load(name, type)
+		# TODO: what if 'o' hasn't been converted...
+	return o
+
+class SPickle:
+	def __init__(self, path=PICKLE_PATH):
+		self.path = path
+
+	def if_cached_else(self, cond, name, function, type=None):
+		if cond and self.exists("production.%s" % name, type):
+			o = self.load(name, type)
+		else:
+			o = function()
+			if cond:
+				self.dump(name, o, type)	# cache the object using 'name'
+		return o
+
+	def __file(self, name, type=None):
+		if type == None:
+			return "%s/%s.pkl" % (self.path, name)
+		else:
+			if noserial:
+				raise Exception("No PHPSerializer module available")
+
+			return "%s/%s.phpserial" % (self.path, name)
+		
+	def exists(self, name, type=None):
+		return os.path.exists(self.__file(name, type))
+
+	def remove(self, name, type=None):
+		return os.remove(self.__file(name, type))
+
+	def load(self, name, type=None):
+		""" 
+		In debug mode, we should fail if neither file exists.
+			if the debug file exists, reset name
+			elif the original file exists, make a copy, reset name
+			else neither exist, raise an error
+		Otherwise, it's normal mode, if the file doesn't exist, raise error
+		Load the file
+		"""
+
+		if config.debug:
+			if self.exists("debug.%s" % name, type):
+				name = "debug.%s" % name
+			elif self.exists("production.%s" % name, type):
+				debugname = "debug.%s" % name
+				if not self.exists(debugname, type):
+					name = "production.%s" % name
+					shutil.copyfile(self.__file(name, type), self.__file(debugname, type))
+				name = debugname
+			else:	# neither exist
+				raise Exception, "No such pickle based on %s" % self.__file("debug.%s" % name, type)
+		else:
+			if   self.exists("production.%s" % name, type):
+				name = "production.%s" % name
+			elif self.exists(name, type):
+				name = name
+			else:
+				raise Exception, "No such file %s" % name
+				
+
+		#print "loading %s" % self.__file(name, type)
+		f = open(self.__file(name, type), 'r')
+		if type == None:
+			o = pickle.load(f)
+		else:
+			if noserial:
+				raise Exception("No PHPSerializer module available")
+			s = PHPUnserialize()
+			o = s.unserialize(f.read())
+		f.close()
+		return o
+			
+	
+	# use the environment to extract the data associated with the local
+	# variable 'name'
+	def dump(self, name, obj=None, type=None, depth=1):
+		if obj == None:
+			o = inspect.getouterframes(inspect.currentframe())
+			up1 = o[depth][0] # get the frame one prior to (up from) this frame
+			argvals = inspect.getargvalues(up1)
+			# TODO: check that 'name' is a local variable; otherwise this would fail.
+			obj = argvals[3][name] # extract the local variable name 'name'
+		if not os.path.isdir("%s/" % self.path):
+			os.mkdir("%s" % self.path)
+		if config.debug:
+			name = "debug.%s" % name
+		else:
+			name = "production.%s" % name
+		f = open(self.__file(name, type), 'w')
+		if type == None:
+			pickle.dump(obj, f)
+		else:
+			if noserial:
+				raise Exception("No PHPSerializer module available")
+			s = PHPSerialize()
+			f.write(s.serialize(obj))
+		f.close()
+		return
-- 
2.47.0