cc-4105: Added exceptions classes. Created config wrapper class

python_apps/media-monitor2/media/monitor/config.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+import os
+from configobj import ConfigObj
+import copy
+
+from media.monitor.log import Loggable
+from media.monitor.exceptions import NoConfigFile, ConfigAccessViolation
+
+class MMConfig(Loggable):
+    def __init__(self, path):
+        if not os.path.exists(path):
+            self.logger.error("Configuration file does not exist. Path: '%s'" % path)
+            raise NoConfigFile(path)
+        self.cfg = ConfigObj(path)
+
+    def __getitem__(self, key):
+        """
+        We always return a copy of the config item to prevent callers from doing any modifications
+        through the returned objects methods
+        """
+        return copy.deepcopy(self.cfg[key])
+
+    def __setitem__(self, key, value):
+        """
+        We use this method not to allow anybody to mess around with config file
+        any settings made should be done through MMConfig's instance methods
+        """
+        raise ConfigAccessViolation(key)
+
+    def save(self): self.cfg.write()
+
+    # Remove this after debugging...
+    def haxxor_set(self, key, value): self.cfg[key] = value
+    def haxxor_get(self, key): return self.cfg[key]
+
+

python_apps/media-monitor2/media/monitor/exceptions.py

@@ -1,7 +1,14 @@
 # -*- coding: utf-8 -*-
 
 class BadSongFile(Exception):
-    def __init__(self, path):
-        self.path = path
+    def __init__(self, path): self.path = path
+    def __str__(self): return "Can't read %s" % self.path
+
+class NoConfigFile(Exception):
+    def __init__(self, path): self.path = path
     def __str__(self):
-        return "Can't read %s" % self.path
+        return "Path '%s' for config file does not exit" % self.path
+
+class ConfigAccessViolation(Exception):
+    def __init__(self,key): self.key = key
+    def __str__(self): return "You must not access key '%s' directly" % self.key