ganeti.errors

Source Code for Module ganeti.errors

1 # 2 # 3 4 # Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Google Inc. 5 # All rights reserved. 6 # 7 # Redistribution and use in source and binary forms, with or without 8 # modification, are permitted provided that the following conditions are 9 # met: 10 # 11 # 1. Redistributions of source code must retain the above copyright notice, 12 # this list of conditions and the following disclaimer. 13 # 14 # 2. Redistributions in binary form must reproduce the above copyright 15 # notice, this list of conditions and the following disclaimer in the 16 # documentation and/or other materials provided with the distribution. 17 # 18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 19 # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 22 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26 # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 31 """Ganeti exception handling. 32 33 """ 34 35 from ganeti import constants 36 37 38 ECODE_RESOLVER = constants.ERRORS_ECODE_RESOLVER 39 ECODE_NORES = constants.ERRORS_ECODE_NORES 40 ECODE_TEMP_NORES = constants.ERRORS_ECODE_TEMP_NORES 41 ECODE_INVAL = constants.ERRORS_ECODE_INVAL 42 ECODE_STATE = constants.ERRORS_ECODE_STATE 43 ECODE_NOENT = constants.ERRORS_ECODE_NOENT 44 ECODE_EXISTS = constants.ERRORS_ECODE_EXISTS 45 ECODE_NOTUNIQUE = constants.ERRORS_ECODE_NOTUNIQUE 46 ECODE_FAULT = constants.ERRORS_ECODE_FAULT 47 ECODE_ENVIRON = constants.ERRORS_ECODE_ENVIRON 48 ECODE_ALL = constants.ERRORS_ECODE_ALL 49 50

51 -class GenericError(Exception):

52 """Base exception for Ganeti. 53 54 """

55 56

57 -class LockError(GenericError):

58 """Lock error exception. 59 60 This signifies problems in the locking subsystem. 61 62 """

63 64

65 -class PidFileLockError(LockError):

66 """PID file is already locked by another process. 67 68 """

69 70

71 -class HypervisorError(GenericError):

72 """Hypervisor-related exception. 73 74 This is raised in case we can't communicate with the hypervisor 75 properly. 76 77 """

78 79

80 -class HotplugError(HypervisorError):

81 """Hotplug-related exception. 82 83 This is raised in case a hotplug action fails or is not supported. 84 It is currently used only by KVM hypervisor. 85 86 """

87 88

89 -class ProgrammerError(GenericError):

90 """Programming-related error. 91 92 This is raised in cases we determine that the calling conventions 93 have been violated, meaning we got some desynchronisation between 94 parts of our code. It signifies a real programming bug. 95 96 """

97 98

99 -class BlockDeviceError(GenericError):

100 """Block-device related exception. 101 102 This is raised in case we can't setup the instance's block devices 103 properly. 104 105 """

106 107

108 -class ConfigurationError(GenericError):

109 """Configuration related exception. 110 111 Things like having an instance with a primary node that doesn't 112 exist in the config or such raise this exception. 113 114 """

115 116

117 -class ConfigVersionMismatch(ConfigurationError):

118 """Version mismatch in the configuration file. 119 120 The error has two arguments: the expected and the actual found 121 version. 122 123 """

124 125

126 -class ConfigVerifyError(ConfigurationError):

127 """Error reported by configuration verification 128 129 The error has two arguments: the main error message and a list of errors 130 found. 131 132 """

133 134

135 -class AddressPoolError(GenericError):

136 """Errors related to IP address pools. 137 138 """

139 140

141 -class ReservationError(GenericError):

142 """Errors reserving a resource. 143 144 """

145 146

147 -class RemoteError(GenericError):

148 """Programming-related error on remote call. 149 150 This is raised when an unhandled error occurs in a call to a 151 remote node. It usually signifies a real programming bug. 152 153 """

154 155

156 -class SignatureError(GenericError):

157 """Error authenticating a remote message. 158 159 This is raised when the hmac signature on a message doesn't verify correctly 160 to the message itself. It can happen because of network unreliability or 161 because of spurious traffic. 162 163 """

164 165

166 -class ParameterError(GenericError):

167 """A passed parameter to a command is invalid. 168 169 This is raised when the parameter passed to a request function is 170 invalid. Correct code should have verified this before passing the 171 request structure. 172 173 The argument to this exception should be the parameter name. 174 175 """

176 177

178 -class ResultValidationError(GenericError):

179 """The iallocation results fails validation. 180 181 """

182 183

184 -class OpPrereqError(GenericError):

185 """Prerequisites for the OpCode are not fulfilled. 186 187 This exception has two arguments: an error message, and one of the 188 ECODE_* codes. 189 190 """

191 192

193 -class OpExecError(GenericError):

194 """Error during OpCode execution. 195 196 """

197 198

199 -class OpResultError(GenericError):

200 """Issue with OpCode result. 201 202 """

203 204

205 -class OpRetryNotSupportedError(GenericError):

206 """This opcode does not support retries 207 208 """

209 210

211 -class DeviceCreationError(GenericError):

212 """Error during the creation of a device. 213 214 This exception should contain the list of the devices actually created 215 up to now, in the form of pairs (node, device) 216 217 """

218 - def __init__(self, message, created_devices):

219 GenericError.__init__(self) 220 self.message = message 221 self.created_devices = created_devices

222

223 - def __str__(self):

224 return self.message

225 226

227 -class OpCodeUnknown(GenericError):

228 """Unknown opcode submitted. 229 230 This signifies a mismatch between the definitions on the client and 231 server side. 232 233 """

234 235

236 -class JobLost(GenericError):

237 """Submitted job lost. 238 239 The job was submitted but it cannot be found in the current job 240 list. 241 242 """

243 244

245 -class JobFileCorrupted(GenericError):

246 """Job file could not be properly decoded/restored. 247 248 """

249 250

251 -class ResolverError(GenericError):

252 """Host name cannot be resolved. 253 254 This is not a normal situation for Ganeti, as we rely on having a 255 working resolver. 256 257 The non-resolvable hostname is available as the first element of the 258 args tuple; the other two elements of the tuple are the first two 259 args of the socket.gaierror exception (error code and description). 260 261 """

262 263

264 -class HooksFailure(GenericError):

265 """A generic hook failure. 266 267 This signifies usually a setup misconfiguration. 268 269 """

270 271

272 -class HooksAbort(HooksFailure):

273 """A required hook has failed. 274 275 This caused an abort of the operation in the initial phase. This 276 exception always has an attribute args which is a list of tuples of: 277 - node: the source node on which this hooks has failed 278 - script: the name of the script which aborted the run 279 280 """

281 282

283 -class UnitParseError(GenericError):

284 """Unable to parse size unit. 285 286 """

287 288

289 -class ParseError(GenericError):

290 """Generic parse error. 291 292 Raised when unable to parse user input. 293 294 """

295 296

297 -class TypeEnforcementError(GenericError):

298 """Unable to enforce data type. 299 300 """

301 302

303 -class X509CertError(GenericError):

304 """Invalid X509 certificate. 305 306 This error has two arguments: the certificate filename and the error cause. 307 308 """

309 310

311 -class TagError(GenericError):

312 """Generic tag error. 313 314 The argument to this exception will show the exact error. 315 316 """

317 318

319 -class CommandError(GenericError):

320 """External command error. 321 322 """

323 324

325 -class StorageError(GenericError):

326 """Storage-related exception. 327 328 """

329 330

331 -class InotifyError(GenericError):

332 """Error raised when there is a failure setting up an inotify watcher. 333 334 """

335 336

337 -class QuitGanetiException(Exception):

338 """Signal Ganeti that it must quit. 339 340 This is not necessarily an error (and thus not a subclass of 341 GenericError), but it's an exceptional circumstance and it is thus 342 treated. This exception should be instantiated with two values. The 343 first one will specify the return code to the caller, and the second 344 one will be the returned result (either as an error or as a normal 345 result). Usually only the leave cluster rpc call should return 346 status True (as there it's expected we quit), every other call will 347 return status False (as a critical error was encountered). 348 349 Examples:: 350 351 # Return a result of "True" to the caller, but quit ganeti afterwards 352 raise QuitGanetiException(True, None) 353 # Send an error to the caller, and quit ganeti 354 raise QuitGanetiException(False, "Fatal safety violation, shutting down") 355 356 """

357 358

359 -class JobQueueError(GenericError):

360 """Job queue error. 361 362 """

363 364

365 -class JobQueueDrainError(JobQueueError):

366 """Job queue is marked for drain error. 367 368 This is raised when a job submission attempt is made but the queue 369 is marked for drain. 370 371 """

372 373

374 -class JobQueueFull(JobQueueError):

375 """Job queue full error. 376 377 Raised when job queue size reached its hard limit. 378 379 """

380 381

382 -class ConfdMagicError(GenericError):

383 """A magic fourcc error in Ganeti confd. 384 385 Errors processing the fourcc in ganeti confd datagrams. 386 387 """

388 389

390 -class ConfdClientError(GenericError):

391 """A magic fourcc error in Ganeti confd. 392 393 Errors in the confd client library. 394 395 """

396 397

398 -class UdpDataSizeError(GenericError):

399 """UDP payload too big. 400 401 """

402 403

404 -class NoCtypesError(GenericError):

405 """python ctypes module is not found in the system. 406 407 """

408 409

410 -class IPAddressError(GenericError):

411 """Generic IP address error. 412 413 """

414 415

416 -class LuxiError(GenericError):

417 """LUXI error. 418 419 """

420 421

422 -class QueryFilterParseError(ParseError):

423 """Error while parsing query filter. 424 425 This exception must be instantiated with two values. The first one is a 426 string with an error description, the second one is an instance of a subclass 427 of C{pyparsing.ParseBaseException} (used to display the exact error 428 location). 429 430 """

431 - def GetDetails(self):

432 """Returns a list of strings with details about the error. 433 434 """ 435 try: 436 (_, inner) = self.args 437 except IndexError: 438 return None 439 440 return [str(inner.line), 441 (" " * (inner.column - 1)) + "^", 442 str(inner)]

443 444

445 -class RapiTestResult(GenericError):

446 """Exception containing results from RAPI test utilities. 447 448 """

449 450

451 -class FileStoragePathError(GenericError):

452 """Error from file storage path validation. 453 454 """

455 456

457 -class SshUpdateError(GenericError):

458 """Error from updating the SSH setup. 459 460 """

461 462 463 # errors should be added above 464 465

466 -def GetErrorClass(name):

467 """Return the class of an exception. 468 469 Given the class name, return the class itself. 470 471 @type name: str 472 @param name: the exception name 473 @rtype: class 474 @return: the actual class, or None if not found 475 476 """ 477 item = globals().get(name, None) 478 if item is not None: 479 if not (isinstance(item, type(Exception)) and 480 issubclass(item, GenericError)): 481 item = None 482 return item

483 484

485 -def EncodeException(err):

486 """Encodes an exception into a format that L{MaybeRaise} will recognise. 487 488 The passed L{err} argument will be formatted as a tuple (exception 489 name, arguments) that the MaybeRaise function will recognise. 490 491 @type err: GenericError child 492 @param err: usually a child of GenericError (but any exception 493 will be accepted) 494 @rtype: tuple 495 @return: tuple of (exception name, exception arguments) 496 497 """ 498 return (err.__class__.__name__, err.args)

499 500

501 -def GetEncodedError(result):

502 """If this looks like an encoded Ganeti exception, return it. 503 504 This function tries to parse the passed argument and if it looks 505 like an encoding done by EncodeException, it will return the class 506 object and arguments. 507 508 """ 509 tlt = (tuple, list) 510 if (isinstance(result, tlt) and len(result) == 2 and 511 isinstance(result[1], tlt)): 512 # custom ganeti errors 513 errcls = GetErrorClass(result[0]) 514 if errcls: 515 return (errcls, tuple(result[1])) 516 517 return None

518 519

520 -def MaybeRaise(result):

521 """If this looks like an encoded Ganeti exception, raise it. 522 523 This function tries to parse the passed argument and if it looks 524 like an encoding done by EncodeException, it will re-raise it. 525 526 """ 527 error = GetEncodedError(result) 528 if error: 529 (errcls, args) = error 530 # pylint: disable=W0142 531 raise errcls(*args)

532