X-Git-Url: https://code.grnet.gr/git/ganeti-local/blobdiff_plain/9f9c8ee24c48e135b9a08f1ca468f00654b3c486..d63997b36350f044add706d9daa8bd6db0bccc46:/lib/errors.py diff --git a/lib/errors.py b/lib/errors.py index 9a62409..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. @@ -98,18 +126,15 @@ class RemoteError(GenericError): pass -class InvalidOS(GenericError): - """Missing OS on node. +class SignatureError(GenericError): + """Error authenticating a remote message. - This is raised when an OS exists on the master (or is otherwise - requested to the code) but not on the target node. - - This exception has three arguments: - - the name of the os - - the source directory, if any - - the reason why we consider this an invalid OS (text of error message) + This is raised when the hmac signature on a message doesn't verify correctly + to the message itself. It can happen because of network unreliability or + because of spurious traffic. """ + pass class ParameterError(GenericError): @@ -128,6 +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. + """ @@ -137,12 +166,6 @@ class OpExecError(GenericError): """ -class OpRetryError(OpExecError): - """Error during OpCode execution, action can be retried. - - """ - - class OpCodeUnknown(GenericError): """Unknown opcode submitted. @@ -199,6 +222,12 @@ class UnitParseError(GenericError): """ +class TypeEnforcementError(GenericError): + """Unable to enforce data type. + + """ + + class SshKeyError(GenericError): """Invalid SSH key. @@ -219,20 +248,152 @@ class CommandError(GenericError): """ +class StorageError(GenericError): + """Storage-related exception. + + """ + + +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. - This is not necessarily an error (and thus not a subclass of GenericError), - but it's an exceptional circumstance and it is thus treated. This instance - should be instantiated with two values. The first one will specify whether an - error should returned to the caller, and the second one will be the returned - result (either as an error or as a normal result). + This is not necessarily an error (and thus not a subclass of + GenericError), but it's an exceptional circumstance and it is thus + treated. This instance should be instantiated with two values. The + first one will specify the return code to the caller, and the second + one will be the returned result (either as an error or as a normal + result). Usually only the leave cluster rpc call should return + status True (as there it's expected we quit), every other call will + return status False (as a critical error was encountered). + + Examples:: - Examples: # Return a result of "True" to the caller, but quit ganeti afterwards - raise QuitGanetiException(False, True) + raise QuitGanetiException(True, None) # Send an error to the caller, and quit ganeti - raise QuitGanetiException(True, "Fatal safety violation, shutting down") + raise QuitGanetiException(False, "Fatal safety violation, shutting down") + + """ + + +class JobQueueError(GenericError): + """Job queue error. + + """ + + +class JobQueueDrainError(JobQueueError): + """Job queue is marked for drain error. + + This is raised when a job submission attempt is made but the queue + is marked for drain. + + """ + + +class JobQueueFull(JobQueueError): + """Job queue full error. + + Raised when job queue size reached its hard limit. + + """ + + +class ConfdFatalError(GenericError): + """A fatal failure in Ganeti confd. + + Events that compromise the ability of confd to proceed further. + (for example: inability to load the config file) """ + +class ConfdRequestError(GenericError): + """A request error in Ganeti confd. + + Events that should make confd abort the current request and proceed serving + different ones. + + """ + + +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 + + +def GetErrorClass(name): + """Return the class of an exception. + + Given the class name, return the class itself. + + @type name: str + @param name: the exception name + @rtype: class + @return: the actual class, or None if not found + + """ + item = globals().get(name, None) + if item is not None: + if not (isinstance(item, type(Exception)) and + 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])