4 # Copyright (C) 2006, 2007 Google Inc.
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.
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.
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
24 This module implements the data structures which define the cluster
25 operations - the so-called opcodes.
27 Every operation which modifies the cluster state is expressed via
32 # this are practically structures, so disable the message about too
34 # pylint: disable-msg=R0903
37 class BaseOpCode(object):
38 """A simple serializable object.
40 This object serves as a parent class for OpCode without any custom
46 def __init__(self, **kwargs):
47 """Constructor for BaseOpCode.
49 The constructor takes only keyword arguments and will set
50 attributes on this object based on the passed arguments. As such,
51 it means that you should not pass arguments which are not in the
52 __slots__ attribute for this class.
56 if key not in self.__slots__:
57 raise TypeError("Object %s doesn't support the parameter '%s'" %
58 (self.__class__.__name__, key))
59 setattr(self, key, kwargs[key])
61 def __getstate__(self):
62 """Generic serializer.
64 This method just returns the contents of the instance as a
68 @return: the instance attributes and their values
72 for name in self.__slots__:
73 if hasattr(self, name):
74 state[name] = getattr(self, name)
77 def __setstate__(self, state):
78 """Generic unserializer.
80 This method just restores from the serialized state the attributes
81 of the current instance.
83 @param state: the serialized opcode data
87 if not isinstance(state, dict):
88 raise ValueError("Invalid data to __setstate__: expected dict, got %s" %
91 for name in self.__slots__:
96 setattr(self, name, state[name])
99 class OpCode(BaseOpCode):
102 This is the root of the actual OpCode hierarchy. All clases derived
103 from this class should override OP_ID.
105 @cvar OP_ID: The ID of this opcode. This should be unique amongst all
106 childre of this class.
109 OP_ID = "OP_ABSTRACT"
112 def __getstate__(self):
113 """Specialized getstate for opcodes.
115 This method adds to the state dictionary the OP_ID of the class,
116 so that on unload we can identify the correct class for
117 instantiating the opcode.
120 @return: the state as a dictionary
123 data = BaseOpCode.__getstate__(self)
124 data["OP_ID"] = self.OP_ID
128 def LoadOpCode(cls, data):
129 """Generic load opcode method.
131 The method identifies the correct opcode class from the dict-form
132 by looking for a OP_ID key, if this is not found, or its value is
133 not available in this module as a child of this class, we fail.
136 @param data: the serialized opcode
139 if not isinstance(data, dict):
140 raise ValueError("Invalid data to LoadOpCode (%s)" % type(data))
141 if "OP_ID" not in data:
142 raise ValueError("Invalid data to LoadOpcode, missing OP_ID")
143 op_id = data["OP_ID"]
145 for item in globals().values():
146 if (isinstance(item, type) and
147 issubclass(item, cls) and
148 hasattr(item, "OP_ID") and
149 getattr(item, "OP_ID") == op_id):
153 raise ValueError("Invalid data to LoadOpCode: OP_ID %s unsupported" %
156 new_data = data.copy()
157 del new_data["OP_ID"]
158 op.__setstate__(new_data)
162 """Generates a summary description of this opcode.
165 # all OP_ID start with OP_, we remove that
167 field_name = getattr(self, "OP_DSC_FIELD", None)
169 field_value = getattr(self, field_name, None)
170 txt = "%s(%s)" % (txt, field_value)
176 class OpDestroyCluster(OpCode):
177 """Destroy the cluster.
179 This opcode has no other parameters. All the state is irreversibly
180 lost after the execution of this opcode.
183 OP_ID = "OP_CLUSTER_DESTROY"
187 class OpQueryClusterInfo(OpCode):
188 """Query cluster information."""
189 OP_ID = "OP_CLUSTER_QUERY"
193 class OpVerifyCluster(OpCode):
194 """Verify the cluster state.
196 @type skip_checks: C{list}
197 @ivar skip_checks: steps to be skipped from the verify process; this
198 needs to be a subset of
199 L{constants.VERIFY_OPTIONAL_CHECKS}; currently
200 only L{constants.VERIFY_NPLUSONE_MEM} can be passed
203 OP_ID = "OP_CLUSTER_VERIFY"
204 __slots__ = ["skip_checks"]
207 class OpVerifyDisks(OpCode):
208 """Verify the cluster disks.
212 Result: a tuple of four elements:
213 - list of node names with bad data returned (unreachable, etc.)
214 - dict of node names with broken volume groups (values: error msg)
215 - list of instances with degraded disks (that should be activated)
216 - dict of instances with missing logical volumes (values: (node, vol)
217 pairs with details about the missing volumes)
219 In normal operation, all lists should be empty. A non-empty instance
220 list (3rd element of the result) is still ok (errors were fixed) but
221 non-empty node list means some node is down, and probably there are
222 unfixable drbd errors.
224 Note that only instances that are drbd-based are taken into
225 consideration. This might need to be revisited in the future.
228 OP_ID = "OP_CLUSTER_VERIFY_DISKS"
232 class OpQueryConfigValues(OpCode):
233 """Query cluster configuration values."""
234 OP_ID = "OP_CLUSTER_CONFIG_QUERY"
235 __slots__ = ["output_fields"]
238 class OpRenameCluster(OpCode):
239 """Rename the cluster.
242 @ivar name: The new name of the cluster. The name and/or the master IP
243 address will be changed to match the new name and its IP
247 OP_ID = "OP_CLUSTER_RENAME"
248 OP_DSC_FIELD = "name"
252 class OpSetClusterParams(OpCode):
253 """Change the parameters of the cluster.
255 @type vg_name: C{str} or C{None}
256 @ivar vg_name: The new volume group name or None to disable LVM usage.
259 OP_ID = "OP_CLUSTER_SET_PARAMS"
262 "enabled_hypervisors",
266 "candidate_pool_size",
270 class OpRedistributeConfig(OpCode):
271 """Force a full push of the cluster configuration.
274 OP_ID = "OP_CLUSTER_REDIST_CONF"
280 class OpRemoveNode(OpCode):
283 @type node_name: C{str}
284 @ivar node_name: The name of the node to remove. If the node still has
285 instances on it, the operation will fail.
288 OP_ID = "OP_NODE_REMOVE"
289 OP_DSC_FIELD = "node_name"
290 __slots__ = ["node_name"]
293 class OpAddNode(OpCode):
294 """Add a node to the cluster.
296 @type node_name: C{str}
297 @ivar node_name: The name of the node to add. This can be a short name,
298 but it will be expanded to the FQDN.
299 @type primary_ip: IP address
300 @ivar primary_ip: The primary IP of the node. This will be ignored when the
301 opcode is submitted, but will be filled during the node
302 add (so it will be visible in the job query).
303 @type secondary_ip: IP address
304 @ivar secondary_ip: The secondary IP of the node. This needs to be passed
305 if the cluster has been initialized in 'dual-network'
306 mode, otherwise it must not be given.
308 @ivar readd: Whether to re-add an existing node to the cluster. If
309 this is not passed, then the operation will abort if the node
310 name is already in the cluster; use this parameter to 'repair'
311 a node that had its configuration broken, or was reinstalled
312 without removal from the cluster.
315 OP_ID = "OP_NODE_ADD"
316 OP_DSC_FIELD = "node_name"
317 __slots__ = ["node_name", "primary_ip", "secondary_ip", "readd"]
320 class OpQueryNodes(OpCode):
321 """Compute the list of nodes."""
322 OP_ID = "OP_NODE_QUERY"
323 __slots__ = ["output_fields", "names", "use_locking"]
326 class OpQueryNodeVolumes(OpCode):
327 """Get list of volumes on node."""
328 OP_ID = "OP_NODE_QUERYVOLS"
329 __slots__ = ["nodes", "output_fields"]
332 class OpSetNodeParams(OpCode):
333 """Change the parameters of a node."""
334 OP_ID = "OP_NODE_SET_PARAMS"
335 OP_DSC_FIELD = "node_name"
345 class OpPowercycleNode(OpCode):
346 """Tries to powercycle a node."""
347 OP_ID = "OP_NODE_POWERCYCLE"
348 OP_DSC_FIELD = "node_name"
356 class OpCreateInstance(OpCode):
357 """Create an instance."""
358 OP_ID = "OP_INSTANCE_CREATE"
359 OP_DSC_FIELD = "instance_name"
361 "instance_name", "os_type", "pnode",
362 "disk_template", "snode", "mode",
364 "src_node", "src_path", "start",
365 "wait_for_sync", "ip_check",
366 "file_storage_dir", "file_driver",
368 "hypervisor", "hvparams", "beparams",
372 class OpReinstallInstance(OpCode):
373 """Reinstall an instance's OS."""
374 OP_ID = "OP_INSTANCE_REINSTALL"
375 OP_DSC_FIELD = "instance_name"
376 __slots__ = ["instance_name", "os_type"]
379 class OpRemoveInstance(OpCode):
380 """Remove an instance."""
381 OP_ID = "OP_INSTANCE_REMOVE"
382 OP_DSC_FIELD = "instance_name"
383 __slots__ = ["instance_name", "ignore_failures"]
386 class OpRenameInstance(OpCode):
387 """Rename an instance."""
388 OP_ID = "OP_INSTANCE_RENAME"
389 __slots__ = ["instance_name", "ignore_ip", "new_name"]
392 class OpStartupInstance(OpCode):
393 """Startup an instance."""
394 OP_ID = "OP_INSTANCE_STARTUP"
395 OP_DSC_FIELD = "instance_name"
396 __slots__ = ["instance_name", "force", "hvparams", "beparams"]
399 class OpShutdownInstance(OpCode):
400 """Shutdown an instance."""
401 OP_ID = "OP_INSTANCE_SHUTDOWN"
402 OP_DSC_FIELD = "instance_name"
403 __slots__ = ["instance_name"]
406 class OpRebootInstance(OpCode):
407 """Reboot an instance."""
408 OP_ID = "OP_INSTANCE_REBOOT"
409 OP_DSC_FIELD = "instance_name"
410 __slots__ = ["instance_name", "reboot_type", "ignore_secondaries" ]
413 class OpReplaceDisks(OpCode):
414 """Replace the disks of an instance."""
415 OP_ID = "OP_INSTANCE_REPLACE_DISKS"
416 OP_DSC_FIELD = "instance_name"
417 __slots__ = ["instance_name", "remote_node", "mode", "disks", "iallocator"]
420 class OpFailoverInstance(OpCode):
421 """Failover an instance."""
422 OP_ID = "OP_INSTANCE_FAILOVER"
423 OP_DSC_FIELD = "instance_name"
424 __slots__ = ["instance_name", "ignore_consistency"]
427 class OpMigrateInstance(OpCode):
428 """Migrate an instance.
430 This migrates (without shutting down an instance) to its secondary
433 @ivar instance_name: the name of the instance
436 OP_ID = "OP_INSTANCE_MIGRATE"
437 OP_DSC_FIELD = "instance_name"
438 __slots__ = ["instance_name", "live", "cleanup"]
441 class OpConnectConsole(OpCode):
442 """Connect to an instance's console."""
443 OP_ID = "OP_INSTANCE_CONSOLE"
444 OP_DSC_FIELD = "instance_name"
445 __slots__ = ["instance_name"]
448 class OpActivateInstanceDisks(OpCode):
449 """Activate an instance's disks."""
450 OP_ID = "OP_INSTANCE_ACTIVATE_DISKS"
451 OP_DSC_FIELD = "instance_name"
452 __slots__ = ["instance_name"]
455 class OpDeactivateInstanceDisks(OpCode):
456 """Deactivate an instance's disks."""
457 OP_ID = "OP_INSTANCE_DEACTIVATE_DISKS"
458 OP_DSC_FIELD = "instance_name"
459 __slots__ = ["instance_name"]
462 class OpQueryInstances(OpCode):
463 """Compute the list of instances."""
464 OP_ID = "OP_INSTANCE_QUERY"
465 __slots__ = ["output_fields", "names", "use_locking"]
468 class OpQueryInstanceData(OpCode):
469 """Compute the run-time status of instances."""
470 OP_ID = "OP_INSTANCE_QUERY_DATA"
471 __slots__ = ["instances", "static"]
474 class OpSetInstanceParams(OpCode):
475 """Change the parameters of an instance."""
476 OP_ID = "OP_INSTANCE_SET_PARAMS"
477 OP_DSC_FIELD = "instance_name"
480 "hvparams", "beparams", "force",
485 class OpGrowDisk(OpCode):
486 """Grow a disk of an instance."""
487 OP_ID = "OP_INSTANCE_GROW_DISK"
488 OP_DSC_FIELD = "instance_name"
489 __slots__ = ["instance_name", "disk", "amount", "wait_for_sync"]
493 class OpDiagnoseOS(OpCode):
494 """Compute the list of guest operating systems."""
495 OP_ID = "OP_OS_DIAGNOSE"
496 __slots__ = ["output_fields", "names"]
500 class OpQueryExports(OpCode):
501 """Compute the list of exported images."""
502 OP_ID = "OP_BACKUP_QUERY"
503 __slots__ = ["nodes", "use_locking"]
506 class OpExportInstance(OpCode):
507 """Export an instance."""
508 OP_ID = "OP_BACKUP_EXPORT"
509 OP_DSC_FIELD = "instance_name"
510 __slots__ = ["instance_name", "target_node", "shutdown"]
513 class OpRemoveExport(OpCode):
514 """Remove an instance's export."""
515 OP_ID = "OP_BACKUP_REMOVE"
516 OP_DSC_FIELD = "instance_name"
517 __slots__ = ["instance_name"]
521 class OpGetTags(OpCode):
522 """Returns the tags of the given object."""
523 OP_ID = "OP_TAGS_GET"
524 OP_DSC_FIELD = "name"
525 __slots__ = ["kind", "name"]
528 class OpSearchTags(OpCode):
529 """Searches the tags in the cluster for a given pattern."""
530 OP_ID = "OP_TAGS_SEARCH"
531 OP_DSC_FIELD = "pattern"
532 __slots__ = ["pattern"]
535 class OpAddTags(OpCode):
536 """Add a list of tags on a given object."""
537 OP_ID = "OP_TAGS_SET"
538 __slots__ = ["kind", "name", "tags"]
541 class OpDelTags(OpCode):
542 """Remove a list of tags from a given object."""
543 OP_ID = "OP_TAGS_DEL"
544 __slots__ = ["kind", "name", "tags"]
548 class OpTestDelay(OpCode):
549 """Sleeps for a configured amount of time.
551 This is used just for debugging and testing.
554 - duration: the time to sleep
555 - on_master: if true, sleep on the master
556 - on_nodes: list of nodes in which to sleep
558 If the on_master parameter is true, it will execute a sleep on the
559 master (before any node sleep).
561 If the on_nodes list is not empty, it will sleep on those nodes
562 (after the sleep on the master, if that is enabled).
564 As an additional feature, the case of duration < 0 will be reported
565 as an execution error, so this opcode can be used as a failure
566 generator. The case of duration == 0 will not be treated specially.
569 OP_ID = "OP_TEST_DELAY"
570 OP_DSC_FIELD = "duration"
571 __slots__ = ["duration", "on_master", "on_nodes"]
574 class OpTestAllocator(OpCode):
575 """Allocator framework testing.
577 This opcode has two modes:
578 - gather and return allocator input for a given mode (allocate new
579 or replace secondary) and a given instance definition (direction
581 - run a selected allocator for a given operation (as above) and
582 return the allocator output (direction 'out')
585 OP_ID = "OP_TEST_ALLOCATOR"
586 OP_DSC_FIELD = "allocator"
588 "direction", "mode", "allocator", "name",
589 "mem_size", "disks", "disk_template",
590 "os", "tags", "nics", "vcpus", "hypervisor",