X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/b125e3b361b62f619f7c3b54e6abb6ecf0adc88d..e02b91145019e33e9e36e7116e6830ff41465079:/lib/errors.py

diff --git a/lib/errors.py b/lib/errors.py
index 82018c3..a50b037 100644
--- a/lib/errors.py
+++ b/lib/errors.py
@@ -22,6 +22,28 @@
 """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"
+
+
 class GenericError(Exception):
   """Base exception for Ganeti.
 
@@ -88,6 +110,12 @@ class ConfigurationError(GenericError):
   pass
 
 
+class ReservationError(GenericError):
+  """Errors reserving a resource.
+
+  """
+
+
 class RemoteError(GenericError):
   """Programming-related error on remote call.
 
@@ -125,6 +153,10 @@ 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 +166,6 @@ class OpExecError(GenericError):
   """
 
 
-class OpRetryError(OpExecError):
-  """Error during OpCode execution, action can be retried.
-
-  """
-
-
 class OpCodeUnknown(GenericError):
   """Unknown opcode submitted.
 
@@ -228,6 +254,12 @@ class StorageError(GenericError):
   """
 
 
+class InotifyError(GenericError):
+  """Error raised when there is a failure setting up an inotify watcher.
+
+  """
+
+
 class QuitGanetiException(Exception):
   """Signal that Ganeti that it must quit.
 
@@ -291,6 +323,28 @@ class ConfdRequestError(GenericError):
   """
 
 
+class ConfdMagicError(GenericError):
+  """A magic fourcc error in Ganeti confd.
+
+  Errors processing the fourcc in ganeti confd datagrams.
+
+  """
+
+
+class ConfdClientError(GenericError):
+  """A magic fourcc error in Ganeti confd.
+
+  Errors in the confd client library.
+
+  """
+
+
+class UdpDataSizeError(GenericError):
+  """UDP payload too big.
+
+  """
+
+
 # errors should be added above
 
 
@@ -311,3 +365,35 @@ def GetErrorClass(name):
             issubclass(item, GenericError)):
       item = None
   return item
+
+
+def EncodeException(err):
+  """Encodes an exception into a format that L{MaybeRaise} will recognise.
+
+  The passed L{err} argument will be formatted as a tuple (exception
+  name, arguments) that the MaybeRaise function will recognise.
+
+  @type err: GenericError child
+  @param err: usually a child of GenericError (but any exception
+      will be accepted)
+  @rtype: tuple
+  @return: tuple of (exception name, exception arguments)
+
+  """
+  return (err.__class__.__name__, err.args)
+
+
+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.
+
+  """
+  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])