better error handling for config files

config.py

@@ -13,12 +13,31 @@ class _ReadOnlyFile():
 	'''
 	def __init__(self, path):
 		self._path = path
-		with open(self._path, 'r') as f:
+		try:
-			self._dict = yaml.safe_load(f)
+			self._load()
+		except FileNotFoundError:
+			logger.warn('File %s not found. Attempting to copy example', self._path)
+			defaultPath = self._path + '.default'
+			
+			try:
+				shutil.copy(defaultPath, self._path)
+			except FileNotFoundError:
+				logger.error('Example file %s not found', defaultPath)
+				raise SystemExit
+				
+			self._path = defaultPath
+			self._load()
+		except yaml.parser.ParserError as e:
+			logger.error(e)
+			raise SystemExit
 			
 	def __getitem__(self, key):
 		return self._dict[key]
 		
+	def _load(self):
+		with open(self._path, 'r') as f:
+			self._dict = yaml.safe_load(f)
+	
 class _ReadWriteFile(_ReadOnlyFile):
 	'''
 	Same as above but adds write functionality. Intended for files that retain
@@ -35,13 +54,5 @@ class _ReadWriteFile(_ReadOnlyFile):
 			with open(self._path, 'w') as f:
 				yaml.dump(self._dict, f, default_flow_style=False)
 
-def _openFile(cls, path):
+configFile = _ReadOnlyFile('config/pyledriver.yaml')
-	try:
+stateFile = _ReadWriteFile('config/state.yaml')
-		return cls(path)
-	except:
-		logger.warn('File %s not found. Copying example', path)
-		shutil.copy(path + '.default', path)
-		return cls(path)
-
-configFile = _openFile(_ReadOnlyFile, 'config/pyledriver.yaml')
-stateFile = _openFile(_ReadWriteFile, 'config/state.yaml')

sharedLogging.py

@@ -12,7 +12,6 @@ Logger conventions
 import logging, os
 from subprocess import run, PIPE, CalledProcessError
 from logging.handlers import TimedRotatingFileHandler, SMTPHandler
-from config import configFile
 from auxilary import mkdirSafe
 
 def _formatConsole(gluster = False):
@@ -94,7 +93,8 @@ rootLogger.addHandler(console)
 # 2) init the module level logger so we can log anything that happens as we build the other loggers
 logger = logging.getLogger(__name__)
 
-# 3) mount glusterfs, any errors here will go to console output
+# 3) init glusterfs, any errors here will go to console output
+from config import configFile
 glusterConf = configFile['gluster']
 
 if glusterConf['server'] != 'example.com':
@@ -105,10 +105,10 @@ else:
 	logger.error('Gluster not configured. Please update config/pyledriver.yaml')
 	raise SystemExit
 
-# 5) import gmail, this must come here as it uses loggers for some of its setup
+# 4) import gmail, this must come here as it uses loggers for some of its setup
 from gmail import gmail, GmailHandler
 
-# 6) init gmail handler
+# 5) init gmail handler
 gmail = GmailHandler(gmail['username'], gmail['passwd'], gmail['recipientList'],
 	'harrison4hegemon - critical error')
 gmail.setLevel(logging.CRITICAL)