cmdlib: Factorize lock releasing

[ganeti-local] / lib / errors.py

diff --git a/lib/errors.py b/lib/errors.py
index 663bc02..9de3b6d 100644 (file)
--- a/lib/errors.py
+++ b/lib/errors.py
@@ -1,7 +1,7 @@
 #
 #
 
-# Copyright (C) 2006, 2007 Google Inc.
+# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -22,6 +22,41 @@
 """Ganeti exception handling"""
 
 
+# OpPrereqError failure types
+
+# resolver errors
+ECODE_RESOLVER = "resolver_error"
+# not enough resources (iallocator failure, disk space, memory, etc.)
+ECODE_NORES = "insufficient_resources"
+# wrong arguments (at syntax level)
+ECODE_INVAL = "wrong_input"
+# wrong entity state
+ECODE_STATE = "wrong_state"
+# entity not found
+ECODE_NOENT = "unknown_entity"
+# entity already exists
+ECODE_EXISTS = "already_exists"
+# resource not unique (e.g. MAC or IP duplication)
+ECODE_NOTUNIQUE = "resource_not_unique"
+# internal cluster error
+ECODE_FAULT = "internal_error"
+# environment error (e.g. node disk error)
+ECODE_ENVIRON = "environment_error"
+
+#: List of all failure types
+ECODE_ALL = frozenset([
+  ECODE_RESOLVER,
+  ECODE_NORES,
+  ECODE_INVAL,
+  ECODE_STATE,
+  ECODE_NOENT,
+  ECODE_EXISTS,
+  ECODE_NOTUNIQUE,
+  ECODE_FAULT,
+  ECODE_ENVIRON,
+  ])
+
+
 class GenericError(Exception):
   """Base exception for Ganeti.
 
@@ -88,6 +123,22 @@ class ConfigurationError(GenericError):
   pass
 
 
+class ConfigVersionMismatch(ConfigurationError):
+  """Version mismatch in the configuration file.
+
+  The error has two arguments: the expected and the actual found
+  version.
+
+  """
+  pass
+
+
+class ReservationError(GenericError):
+  """Errors reserving a resource.
+
+  """
+
+
 class RemoteError(GenericError):
   """Programming-related error on remote call.
 
@@ -125,6 +176,10 @@ class ParameterError(GenericError):
 class OpPrereqError(GenericError):
   """Prerequisites for the OpCode are not fulfilled.
 
+  This exception will have either one or two arguments. For the
+  two-argument construction, the second argument should be one of the
+  ECODE_* codes.
+
   """
 
 
@@ -134,12 +189,6 @@ class OpExecError(GenericError):
   """
 
 
-class OpRetryError(OpExecError):
-  """Error during OpCode execution, action can be retried.
-
-  """
-
-
 class OpCodeUnknown(GenericError):
   """Unknown opcode submitted.
 
@@ -158,6 +207,12 @@ class JobLost(GenericError):
   """
 
 
+class JobFileCorrupted(GenericError):
+  """Job file could not be properly decoded/restored.
+
+  """
+
+
 class ResolverError(GenericError):
   """Host name cannot be resolved.
 
@@ -196,6 +251,14 @@ class UnitParseError(GenericError):
   """
 
 
+class ParseError(GenericError):
+  """Generic parse error.
+
+  Raised when unable to parse user input.
+
+  """
+
+
 class TypeEnforcementError(GenericError):
   """Unable to enforce data type.
 
@@ -235,7 +298,7 @@ class InotifyError(GenericError):
 
 
 class QuitGanetiException(Exception):
-  """Signal that Ganeti that it must quit.
+  """Signal Ganeti that it must quit.
 
   This is not necessarily an error (and thus not a subclass of
   GenericError), but it's an exceptional circumstance and it is thus
@@ -279,20 +342,27 @@ class JobQueueFull(JobQueueError):
   """
 
 
-class ConfdFatalError(GenericError):
-  """A fatal failure in Ganeti confd.
+class ConfdRequestError(GenericError):
+  """A request error in Ganeti confd.
 
-  Events that compromise the ability of confd to proceed further.
-  (for example: inability to load the config file)
+  Events that should make confd abort the current request and proceed serving
+  different ones.
 
   """
 
 
-class ConfdRequestError(GenericError):
-  """A request error in Ganeti confd.
+class ConfdMagicError(GenericError):
+  """A magic fourcc error in Ganeti confd.
 
-  Events that should make confd abort the current request and proceed serving
-  different ones.
+  Errors processing the fourcc in ganeti confd datagrams.
+
+  """
+
+
+class ConfdClientError(GenericError):
+  """A magic fourcc error in Ganeti confd.
+
+  Errors in the confd client library.
 
   """
 
@@ -303,6 +373,42 @@ class UdpDataSizeError(GenericError):
   """
 
 
+class NoCtypesError(GenericError):
+  """python ctypes module is not found in the system.
+
+  """
+
+
+class IPAddressError(GenericError):
+  """Generic IP address error.
+
+  """
+
+
+class LuxiError(GenericError):
+  """LUXI error.
+
+  """
+
+
+class QueryFilterParseError(ParseError):
+  """Error while parsing query filter.
+
+  """
+  def GetDetails(self):
+    """Returns a list of strings with details about the error.
+
+    """
+    try:
+      (_, inner) = self.args
+    except IndexError:
+      return None
+
+    return [str(inner.line),
+            (" " * (inner.column - 1)) + "^",
+            str(inner)]
+
+
 # errors should be added above
 
 
@@ -341,17 +447,33 @@ def EncodeException(err):
   return (err.__class__.__name__, err.args)
 
 
-def MaybeRaise(result):
-  """Is this looks like an encoded Ganeti exception, raise it.
+def GetEncodedError(result):
+  """If this looks like an encoded Ganeti exception, return it.
 
   This function tries to parse the passed argument and if it looks
-  like an encoding done by EncodeException, it will re-raise it.
+  like an encoding done by EncodeException, it will return the class
+  object and arguments.
 
   """
   tlt = (tuple, list)
   if (isinstance(result, tlt) and len(result) == 2 and
       isinstance(result[1], tlt)):
     # custom ganeti errors
-    err_class = GetErrorClass(result[0])
-    if err_class is not None:
-      raise err_class, tuple(result[1])
+    errcls = GetErrorClass(result[0])
+    if errcls:
+      return (errcls, tuple(result[1]))
+
+  return None
+
+
+def MaybeRaise(result):
+  """If this looks like an encoded Ganeti exception, raise it.
+
+  This function tries to parse the passed argument and if it looks
+  like an encoding done by EncodeException, it will re-raise it.
+
+  """
+  error = GetEncodedError(result)
+  if error:
+    (errcls, args) = error
+    raise errcls, args