+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
+import config
+import config as monitorconfig
+
+DEBUG= 0
+PICKLE_PATH=monitorconfig.MONITOR_DATA_ROOT
+
+
+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
+
+
+ #import traceback
+ #print traceback.print_stack()
+ #print "loading %s" % self.__file(name, type)
+ #sys.stderr.write("-----------------------------\n")
+ 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