root / lib / errors.py @ ad0e078e
History | View | Annotate | Download (10.4 kB)
1 |
#
|
---|---|
2 |
#
|
3 |
|
4 |
# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.
|
5 |
#
|
6 |
# This program is free software; you can redistribute it and/or modify
|
7 |
# it under the terms of the GNU General Public License as published by
|
8 |
# the Free Software Foundation; either version 2 of the License, or
|
9 |
# (at your option) any later version.
|
10 |
#
|
11 |
# This program is distributed in the hope that it will be useful, but
|
12 |
# WITHOUT ANY WARRANTY; without even the implied warranty of
|
13 |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
14 |
# General Public License for more details.
|
15 |
#
|
16 |
# You should have received a copy of the GNU General Public License
|
17 |
# along with this program; if not, write to the Free Software
|
18 |
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
19 |
# 02110-1301, USA.
|
20 |
|
21 |
|
22 |
"""Ganeti exception handling"""
|
23 |
|
24 |
|
25 |
# OpPrereqError failure types
|
26 |
|
27 |
# resolver errors
|
28 |
ECODE_RESOLVER = "resolver_error"
|
29 |
# not enough resources (iallocator failure, disk space, memory, etc.)
|
30 |
ECODE_NORES = "insufficient_resources"
|
31 |
# wrong arguments (at syntax level)
|
32 |
ECODE_INVAL = "wrong_input"
|
33 |
# wrong entity state
|
34 |
ECODE_STATE = "wrong_state"
|
35 |
# entity not found
|
36 |
ECODE_NOENT = "unknown_entity"
|
37 |
# entity already exists
|
38 |
ECODE_EXISTS = "already_exists"
|
39 |
# resource not unique (e.g. MAC or IP duplication)
|
40 |
ECODE_NOTUNIQUE = "resource_not_unique"
|
41 |
# internal cluster error
|
42 |
ECODE_FAULT = "internal_error"
|
43 |
# environment error (e.g. node disk error)
|
44 |
ECODE_ENVIRON = "environment_error"
|
45 |
|
46 |
#: List of all failure types
|
47 |
ECODE_ALL = frozenset([
|
48 |
ECODE_RESOLVER, |
49 |
ECODE_NORES, |
50 |
ECODE_INVAL, |
51 |
ECODE_STATE, |
52 |
ECODE_NOENT, |
53 |
ECODE_EXISTS, |
54 |
ECODE_NOTUNIQUE, |
55 |
ECODE_FAULT, |
56 |
ECODE_ENVIRON, |
57 |
]) |
58 |
|
59 |
|
60 |
class GenericError(Exception): |
61 |
"""Base exception for Ganeti.
|
62 |
|
63 |
"""
|
64 |
pass
|
65 |
|
66 |
|
67 |
class LVMError(GenericError): |
68 |
"""LVM-related exception.
|
69 |
|
70 |
This exception codifies problems with LVM setup.
|
71 |
|
72 |
"""
|
73 |
pass
|
74 |
|
75 |
|
76 |
class LockError(GenericError): |
77 |
"""Lock error exception.
|
78 |
|
79 |
This signifies problems in the locking subsystem.
|
80 |
|
81 |
"""
|
82 |
pass
|
83 |
|
84 |
|
85 |
class PidFileLockError(LockError): |
86 |
"""PID file is already locked by another process.
|
87 |
|
88 |
"""
|
89 |
|
90 |
|
91 |
class HypervisorError(GenericError): |
92 |
"""Hypervisor-related exception.
|
93 |
|
94 |
This is raised in case we can't communicate with the hypervisor
|
95 |
properly.
|
96 |
|
97 |
"""
|
98 |
pass
|
99 |
|
100 |
|
101 |
class ProgrammerError(GenericError): |
102 |
"""Programming-related error.
|
103 |
|
104 |
This is raised in cases we determine that the calling conventions
|
105 |
have been violated, meaning we got some desynchronisation between
|
106 |
parts of our code. It signifies a real programming bug.
|
107 |
|
108 |
"""
|
109 |
pass
|
110 |
|
111 |
|
112 |
class BlockDeviceError(GenericError): |
113 |
"""Block-device related exception.
|
114 |
|
115 |
This is raised in case we can't setup the instance's block devices
|
116 |
properly.
|
117 |
|
118 |
"""
|
119 |
pass
|
120 |
|
121 |
|
122 |
class ConfigurationError(GenericError): |
123 |
"""Configuration related exception.
|
124 |
|
125 |
Things like having an instance with a primary node that doesn't
|
126 |
exist in the config or such raise this exception.
|
127 |
|
128 |
"""
|
129 |
pass
|
130 |
|
131 |
|
132 |
class ConfigVersionMismatch(ConfigurationError): |
133 |
"""Version mismatch in the configuration file.
|
134 |
|
135 |
The error has two arguments: the expected and the actual found
|
136 |
version.
|
137 |
|
138 |
"""
|
139 |
pass
|
140 |
|
141 |
|
142 |
class ReservationError(GenericError): |
143 |
"""Errors reserving a resource.
|
144 |
|
145 |
"""
|
146 |
|
147 |
|
148 |
class RemoteError(GenericError): |
149 |
"""Programming-related error on remote call.
|
150 |
|
151 |
This is raised when an unhandled error occurs in a call to a
|
152 |
remote node. It usually signifies a real programming bug.
|
153 |
|
154 |
"""
|
155 |
pass
|
156 |
|
157 |
|
158 |
class SignatureError(GenericError): |
159 |
"""Error authenticating a remote message.
|
160 |
|
161 |
This is raised when the hmac signature on a message doesn't verify correctly
|
162 |
to the message itself. It can happen because of network unreliability or
|
163 |
because of spurious traffic.
|
164 |
|
165 |
"""
|
166 |
pass
|
167 |
|
168 |
|
169 |
class ParameterError(GenericError): |
170 |
"""A passed parameter to a command is invalid.
|
171 |
|
172 |
This is raised when the parameter passed to a request function is
|
173 |
invalid. Correct code should have verified this before passing the
|
174 |
request structure.
|
175 |
|
176 |
The argument to this exception should be the parameter name.
|
177 |
|
178 |
"""
|
179 |
pass
|
180 |
|
181 |
|
182 |
class OpPrereqError(GenericError): |
183 |
"""Prerequisites for the OpCode are not fulfilled.
|
184 |
|
185 |
This exception will have either one or two arguments. For the
|
186 |
two-argument construction, the second argument should be one of the
|
187 |
ECODE_* codes.
|
188 |
|
189 |
"""
|
190 |
|
191 |
|
192 |
class OpExecError(GenericError): |
193 |
"""Error during OpCode execution.
|
194 |
|
195 |
"""
|
196 |
|
197 |
|
198 |
class OpResultError(GenericError): |
199 |
"""Issue with OpCode result.
|
200 |
|
201 |
"""
|
202 |
|
203 |
|
204 |
class OpCodeUnknown(GenericError): |
205 |
"""Unknown opcode submitted.
|
206 |
|
207 |
This signifies a mismatch between the definitions on the client and
|
208 |
server side.
|
209 |
|
210 |
"""
|
211 |
|
212 |
|
213 |
class JobLost(GenericError): |
214 |
"""Submitted job lost.
|
215 |
|
216 |
The job was submitted but it cannot be found in the current job
|
217 |
list.
|
218 |
|
219 |
"""
|
220 |
|
221 |
|
222 |
class JobFileCorrupted(GenericError): |
223 |
"""Job file could not be properly decoded/restored.
|
224 |
|
225 |
"""
|
226 |
|
227 |
|
228 |
class ResolverError(GenericError): |
229 |
"""Host name cannot be resolved.
|
230 |
|
231 |
This is not a normal situation for Ganeti, as we rely on having a
|
232 |
working resolver.
|
233 |
|
234 |
The non-resolvable hostname is available as the first element of the
|
235 |
args tuple; the other two elements of the tuple are the first two
|
236 |
args of the socket.gaierror exception (error code and description).
|
237 |
|
238 |
"""
|
239 |
|
240 |
|
241 |
class HooksFailure(GenericError): |
242 |
"""A generic hook failure.
|
243 |
|
244 |
This signifies usually a setup misconfiguration.
|
245 |
|
246 |
"""
|
247 |
|
248 |
|
249 |
class HooksAbort(HooksFailure): |
250 |
"""A required hook has failed.
|
251 |
|
252 |
This caused an abort of the operation in the initial phase. This
|
253 |
exception always has an attribute args which is a list of tuples of:
|
254 |
- node: the source node on which this hooks has failed
|
255 |
- script: the name of the script which aborted the run
|
256 |
|
257 |
"""
|
258 |
|
259 |
|
260 |
class UnitParseError(GenericError): |
261 |
"""Unable to parse size unit.
|
262 |
|
263 |
"""
|
264 |
|
265 |
|
266 |
class ParseError(GenericError): |
267 |
"""Generic parse error.
|
268 |
|
269 |
Raised when unable to parse user input.
|
270 |
|
271 |
"""
|
272 |
|
273 |
|
274 |
class TypeEnforcementError(GenericError): |
275 |
"""Unable to enforce data type.
|
276 |
|
277 |
"""
|
278 |
|
279 |
|
280 |
class SshKeyError(GenericError): |
281 |
"""Invalid SSH key.
|
282 |
|
283 |
"""
|
284 |
|
285 |
|
286 |
class X509CertError(GenericError): |
287 |
"""Invalid X509 certificate.
|
288 |
|
289 |
This error has two arguments: the certificate filename and the error cause.
|
290 |
|
291 |
"""
|
292 |
|
293 |
|
294 |
class TagError(GenericError): |
295 |
"""Generic tag error.
|
296 |
|
297 |
The argument to this exception will show the exact error.
|
298 |
|
299 |
"""
|
300 |
|
301 |
|
302 |
class CommandError(GenericError): |
303 |
"""External command error.
|
304 |
|
305 |
"""
|
306 |
|
307 |
|
308 |
class StorageError(GenericError): |
309 |
"""Storage-related exception.
|
310 |
|
311 |
"""
|
312 |
|
313 |
|
314 |
class InotifyError(GenericError): |
315 |
"""Error raised when there is a failure setting up an inotify watcher.
|
316 |
|
317 |
"""
|
318 |
|
319 |
|
320 |
class QuitGanetiException(Exception): |
321 |
"""Signal Ganeti that it must quit.
|
322 |
|
323 |
This is not necessarily an error (and thus not a subclass of
|
324 |
GenericError), but it's an exceptional circumstance and it is thus
|
325 |
treated. This instance should be instantiated with two values. The
|
326 |
first one will specify the return code to the caller, and the second
|
327 |
one will be the returned result (either as an error or as a normal
|
328 |
result). Usually only the leave cluster rpc call should return
|
329 |
status True (as there it's expected we quit), every other call will
|
330 |
return status False (as a critical error was encountered).
|
331 |
|
332 |
Examples::
|
333 |
|
334 |
# Return a result of "True" to the caller, but quit ganeti afterwards
|
335 |
raise QuitGanetiException(True, None)
|
336 |
# Send an error to the caller, and quit ganeti
|
337 |
raise QuitGanetiException(False, "Fatal safety violation, shutting down")
|
338 |
|
339 |
"""
|
340 |
|
341 |
|
342 |
class JobQueueError(GenericError): |
343 |
"""Job queue error.
|
344 |
|
345 |
"""
|
346 |
|
347 |
|
348 |
class JobQueueDrainError(JobQueueError): |
349 |
"""Job queue is marked for drain error.
|
350 |
|
351 |
This is raised when a job submission attempt is made but the queue
|
352 |
is marked for drain.
|
353 |
|
354 |
"""
|
355 |
|
356 |
|
357 |
class JobQueueFull(JobQueueError): |
358 |
"""Job queue full error.
|
359 |
|
360 |
Raised when job queue size reached its hard limit.
|
361 |
|
362 |
"""
|
363 |
|
364 |
|
365 |
class ConfdRequestError(GenericError): |
366 |
"""A request error in Ganeti confd.
|
367 |
|
368 |
Events that should make confd abort the current request and proceed serving
|
369 |
different ones.
|
370 |
|
371 |
"""
|
372 |
|
373 |
|
374 |
class ConfdMagicError(GenericError): |
375 |
"""A magic fourcc error in Ganeti confd.
|
376 |
|
377 |
Errors processing the fourcc in ganeti confd datagrams.
|
378 |
|
379 |
"""
|
380 |
|
381 |
|
382 |
class ConfdClientError(GenericError): |
383 |
"""A magic fourcc error in Ganeti confd.
|
384 |
|
385 |
Errors in the confd client library.
|
386 |
|
387 |
"""
|
388 |
|
389 |
|
390 |
class UdpDataSizeError(GenericError): |
391 |
"""UDP payload too big.
|
392 |
|
393 |
"""
|
394 |
|
395 |
|
396 |
class NoCtypesError(GenericError): |
397 |
"""python ctypes module is not found in the system.
|
398 |
|
399 |
"""
|
400 |
|
401 |
|
402 |
class IPAddressError(GenericError): |
403 |
"""Generic IP address error.
|
404 |
|
405 |
"""
|
406 |
|
407 |
|
408 |
class LuxiError(GenericError): |
409 |
"""LUXI error.
|
410 |
|
411 |
"""
|
412 |
|
413 |
|
414 |
class QueryFilterParseError(ParseError): |
415 |
"""Error while parsing query filter.
|
416 |
|
417 |
"""
|
418 |
def GetDetails(self): |
419 |
"""Returns a list of strings with details about the error.
|
420 |
|
421 |
"""
|
422 |
try:
|
423 |
(_, inner) = self.args
|
424 |
except IndexError: |
425 |
return None |
426 |
|
427 |
return [str(inner.line), |
428 |
(" " * (inner.column - 1)) + "^", |
429 |
str(inner)]
|
430 |
|
431 |
|
432 |
# errors should be added above
|
433 |
|
434 |
|
435 |
def GetErrorClass(name): |
436 |
"""Return the class of an exception.
|
437 |
|
438 |
Given the class name, return the class itself.
|
439 |
|
440 |
@type name: str
|
441 |
@param name: the exception name
|
442 |
@rtype: class
|
443 |
@return: the actual class, or None if not found
|
444 |
|
445 |
"""
|
446 |
item = globals().get(name, None) |
447 |
if item is not None: |
448 |
if not (isinstance(item, type(Exception)) and |
449 |
issubclass(item, GenericError)):
|
450 |
item = None
|
451 |
return item
|
452 |
|
453 |
|
454 |
def EncodeException(err): |
455 |
"""Encodes an exception into a format that L{MaybeRaise} will recognise.
|
456 |
|
457 |
The passed L{err} argument will be formatted as a tuple (exception
|
458 |
name, arguments) that the MaybeRaise function will recognise.
|
459 |
|
460 |
@type err: GenericError child
|
461 |
@param err: usually a child of GenericError (but any exception
|
462 |
will be accepted)
|
463 |
@rtype: tuple
|
464 |
@return: tuple of (exception name, exception arguments)
|
465 |
|
466 |
"""
|
467 |
return (err.__class__.__name__, err.args)
|
468 |
|
469 |
|
470 |
def GetEncodedError(result): |
471 |
"""If this looks like an encoded Ganeti exception, return it.
|
472 |
|
473 |
This function tries to parse the passed argument and if it looks
|
474 |
like an encoding done by EncodeException, it will return the class
|
475 |
object and arguments.
|
476 |
|
477 |
"""
|
478 |
tlt = (tuple, list) |
479 |
if (isinstance(result, tlt) and len(result) == 2 and |
480 |
isinstance(result[1], tlt)): |
481 |
# custom ganeti errors
|
482 |
errcls = GetErrorClass(result[0])
|
483 |
if errcls:
|
484 |
return (errcls, tuple(result[1])) |
485 |
|
486 |
return None |
487 |
|
488 |
|
489 |
def MaybeRaise(result): |
490 |
"""If this looks like an encoded Ganeti exception, raise it.
|
491 |
|
492 |
This function tries to parse the passed argument and if it looks
|
493 |
like an encoding done by EncodeException, it will re-raise it.
|
494 |
|
495 |
"""
|
496 |
error = GetEncodedError(result) |
497 |
if error:
|
498 |
(errcls, args) = error |
499 |
raise errcls(args)
|