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
22 """Transportable objects for Ganeti.
24 This module provides small, mostly data-only objects which are safe to
25 pass to and from external parties.
33 from cStringIO import StringIO
35 from ganeti import errors
36 from ganeti import constants
39 __all__ = ["ConfigObject", "ConfigData", "NIC", "Disk", "Instance",
40 "OS", "Node", "Cluster", "FillDict"]
42 _TIMESTAMPS = ["ctime", "mtime"]
45 def FillDict(defaults_dict, custom_dict):
46 """Basic function to apply settings on top a default dict.
48 @type defaults_dict: dict
49 @param defaults_dict: dictionary holding the default values
50 @type custom_dict: dict
51 @param custom_dict: dictionary holding customized value
53 @return: dict with the 'full' values
56 ret_dict = copy.deepcopy(defaults_dict)
57 ret_dict.update(custom_dict)
61 def UpgradeGroupedParams(target, defaults):
62 """Update all groups for the target parameter.
64 @type target: dict of dicts
65 @param target: {group: {parameter: value}}
67 @param defaults: default parameter values
71 target = {constants.PP_DEFAULT: defaults}
74 target[group] = FillDict(defaults, target[group])
78 class ConfigObject(object):
79 """A generic config object.
81 It has the following properties:
83 - provides somewhat safe recursive unpickling and pickling for its classes
84 - unset attributes which are defined in slots are always returned
85 as None instead of raising an error
87 Classes derived from this must always declare __slots__ (we use many
88 config objects and the memory reduction is useful)
93 def __init__(self, **kwargs):
94 for k, v in kwargs.iteritems():
97 def __getattr__(self, name):
98 if name not in self.__slots__:
99 raise AttributeError("Invalid object attribute %s.%s" %
100 (type(self).__name__, name))
103 def __setstate__(self, state):
105 if name in self.__slots__:
106 setattr(self, name, state[name])
109 """Convert to a dict holding only standard python types.
111 The generic routine just dumps all of this object's attributes in
112 a dict. It does not work if the class has children who are
113 ConfigObjects themselves (e.g. the nics list in an Instance), in
114 which case the object should subclass the function in order to
115 make sure all objects returned are only standard python types.
119 for name in self.__slots__:
120 value = getattr(self, name, None)
121 if value is not None:
125 __getstate__ = ToDict
128 def FromDict(cls, val):
129 """Create an object from a dictionary.
131 This generic routine takes a dict, instantiates a new instance of
132 the given class, and sets attributes based on the dict content.
134 As for `ToDict`, this does not work if the class has children
135 who are ConfigObjects themselves (e.g. the nics list in an
136 Instance), in which case the object should subclass the function
137 and alter the objects.
140 if not isinstance(val, dict):
141 raise errors.ConfigurationError("Invalid object passed to FromDict:"
142 " expected dict, got %s" % type(val))
143 val_str = dict([(str(k), v) for k, v in val.iteritems()])
148 def _ContainerToDicts(container):
149 """Convert the elements of a container to standard python types.
151 This method converts a container with elements derived from
152 ConfigData to standard python types. If the container is a dict,
153 we don't touch the keys, only the values.
156 if isinstance(container, dict):
157 ret = dict([(k, v.ToDict()) for k, v in container.iteritems()])
158 elif isinstance(container, (list, tuple, set, frozenset)):
159 ret = [elem.ToDict() for elem in container]
161 raise TypeError("Invalid type %s passed to _ContainerToDicts" %
166 def _ContainerFromDicts(source, c_type, e_type):
167 """Convert a container from standard python types.
169 This method converts a container with standard python types to
170 ConfigData objects. If the container is a dict, we don't touch the
171 keys, only the values.
174 if not isinstance(c_type, type):
175 raise TypeError("Container type %s passed to _ContainerFromDicts is"
176 " not a type" % type(c_type))
178 ret = dict([(k, e_type.FromDict(v)) for k, v in source.iteritems()])
179 elif c_type in (list, tuple, set, frozenset):
180 ret = c_type([e_type.FromDict(elem) for elem in source])
182 raise TypeError("Invalid container type %s passed to"
183 " _ContainerFromDicts" % c_type)
187 """Makes a deep copy of the current object and its children.
190 dict_form = self.ToDict()
191 clone_obj = self.__class__.FromDict(dict_form)
195 """Implement __repr__ for ConfigObjects."""
196 return repr(self.ToDict())
198 def UpgradeConfig(self):
199 """Fill defaults for missing configuration values.
201 This method will be called at configuration load time, and its
202 implementation will be object dependent.
208 class TaggableObject(ConfigObject):
209 """An generic class supporting tags.
212 __slots__ = ConfigObject.__slots__ + ["tags"]
215 def ValidateTag(tag):
216 """Check if a tag is valid.
218 If the tag is invalid, an errors.TagError will be raised. The
219 function has no return value.
222 if not isinstance(tag, basestring):
223 raise errors.TagError("Invalid tag type (not a string)")
224 if len(tag) > constants.MAX_TAG_LEN:
225 raise errors.TagError("Tag too long (>%d characters)" %
226 constants.MAX_TAG_LEN)
228 raise errors.TagError("Tags cannot be empty")
229 if not re.match("^[\w.+*/:-]+$", tag):
230 raise errors.TagError("Tag contains invalid characters")
233 """Return the tags list.
236 tags = getattr(self, "tags", None)
238 tags = self.tags = set()
241 def AddTag(self, tag):
245 self.ValidateTag(tag)
246 tags = self.GetTags()
247 if len(tags) >= constants.MAX_TAGS_PER_OBJ:
248 raise errors.TagError("Too many tags")
249 self.GetTags().add(tag)
251 def RemoveTag(self, tag):
255 self.ValidateTag(tag)
256 tags = self.GetTags()
260 raise errors.TagError("Tag not found")
263 """Taggable-object-specific conversion to standard python types.
265 This replaces the tags set with a list.
268 bo = super(TaggableObject, self).ToDict()
270 tags = bo.get("tags", None)
271 if isinstance(tags, set):
272 bo["tags"] = list(tags)
276 def FromDict(cls, val):
277 """Custom function for instances.
280 obj = super(TaggableObject, cls).FromDict(val)
281 if hasattr(obj, "tags") and isinstance(obj.tags, list):
282 obj.tags = set(obj.tags)
286 class ConfigData(ConfigObject):
287 """Top-level config object."""
288 __slots__ = (["version", "cluster", "nodes", "instances", "serial_no"] +
292 """Custom function for top-level config data.
294 This just replaces the list of instances, nodes and the cluster
295 with standard python types.
298 mydict = super(ConfigData, self).ToDict()
299 mydict["cluster"] = mydict["cluster"].ToDict()
300 for key in "nodes", "instances":
301 mydict[key] = self._ContainerToDicts(mydict[key])
306 def FromDict(cls, val):
307 """Custom function for top-level config data
310 obj = super(ConfigData, cls).FromDict(val)
311 obj.cluster = Cluster.FromDict(obj.cluster)
312 obj.nodes = cls._ContainerFromDicts(obj.nodes, dict, Node)
313 obj.instances = cls._ContainerFromDicts(obj.instances, dict, Instance)
316 def UpgradeConfig(self):
317 """Fill defaults for missing configuration values.
320 self.cluster.UpgradeConfig()
321 for node in self.nodes.values():
323 for instance in self.instances.values():
324 instance.UpgradeConfig()
327 class NIC(ConfigObject):
328 """Config object representing a network card."""
329 __slots__ = ["mac", "ip", "bridge", "nicparams"]
332 def CheckParameterSyntax(cls, nicparams):
333 """Check the given parameters for validity.
335 @type nicparams: dict
336 @param nicparams: dictionary with parameter names/value
337 @raise errors.ConfigurationError: when a parameter is not valid
340 if nicparams[constants.NIC_MODE] not in constants.NIC_VALID_MODES:
341 err = "Invalid nic mode: %s" % nicparams[constants.NIC_MODE]
342 raise errors.ConfigurationError(err)
344 if (nicparams[constants.NIC_MODE] is constants.NIC_MODE_BRIDGED and
345 not nicparams[constants.NIC_LINK]):
346 err = "Missing bridged nic link"
347 raise errors.ConfigurationError(err)
349 def UpgradeConfig(self):
350 """Fill defaults for missing configuration values.
353 if self.nicparams is None:
355 if self.bridge is not None:
356 self.nicparams[constants.NIC_MODE] = constants.NIC_MODE_BRIDGED
357 self.nicparams[constants.NIC_LINK] = self.bridge
358 # bridge is no longer used it 2.1. The slot is left there to support
359 # upgrading, but will be removed in 2.2
360 if self.bridge is not None:
364 class Disk(ConfigObject):
365 """Config object representing a block device."""
366 __slots__ = ["dev_type", "logical_id", "physical_id",
367 "children", "iv_name", "size", "mode"]
369 def CreateOnSecondary(self):
370 """Test if this device needs to be created on a secondary node."""
371 return self.dev_type in (constants.LD_DRBD8, constants.LD_LV)
373 def AssembleOnSecondary(self):
374 """Test if this device needs to be assembled on a secondary node."""
375 return self.dev_type in (constants.LD_DRBD8, constants.LD_LV)
377 def OpenOnSecondary(self):
378 """Test if this device needs to be opened on a secondary node."""
379 return self.dev_type in (constants.LD_LV,)
381 def StaticDevPath(self):
382 """Return the device path if this device type has a static one.
384 Some devices (LVM for example) live always at the same /dev/ path,
385 irrespective of their status. For such devices, we return this
386 path, for others we return None.
389 if self.dev_type == constants.LD_LV:
390 return "/dev/%s/%s" % (self.logical_id[0], self.logical_id[1])
393 def ChildrenNeeded(self):
394 """Compute the needed number of children for activation.
396 This method will return either -1 (all children) or a positive
397 number denoting the minimum number of children needed for
398 activation (only mirrored devices will usually return >=0).
400 Currently, only DRBD8 supports diskless activation (therefore we
401 return 0), for all other we keep the previous semantics and return
405 if self.dev_type == constants.LD_DRBD8:
409 def GetNodes(self, node):
410 """This function returns the nodes this device lives on.
412 Given the node on which the parent of the device lives on (or, in
413 case of a top-level device, the primary node of the devices'
414 instance), this function will return a list of nodes on which this
415 devices needs to (or can) be assembled.
418 if self.dev_type in [constants.LD_LV, constants.LD_FILE]:
420 elif self.dev_type in constants.LDS_DRBD:
421 result = [self.logical_id[0], self.logical_id[1]]
422 if node not in result:
423 raise errors.ConfigurationError("DRBD device passed unknown node")
425 raise errors.ProgrammerError("Unhandled device type %s" % self.dev_type)
428 def ComputeNodeTree(self, parent_node):
429 """Compute the node/disk tree for this disk and its children.
431 This method, given the node on which the parent disk lives, will
432 return the list of all (node, disk) pairs which describe the disk
433 tree in the most compact way. For example, a drbd/lvm stack
434 will be returned as (primary_node, drbd) and (secondary_node, drbd)
435 which represents all the top-level devices on the nodes.
438 my_nodes = self.GetNodes(parent_node)
439 result = [(node, self) for node in my_nodes]
440 if not self.children:
443 for node in my_nodes:
444 for child in self.children:
445 child_result = child.ComputeNodeTree(node)
446 if len(child_result) == 1:
447 # child (and all its descendants) is simple, doesn't split
448 # over multiple hosts, so we don't need to describe it, our
449 # own entry for this node describes it completely
452 # check if child nodes differ from my nodes; note that
453 # subdisk can differ from the child itself, and be instead
454 # one of its descendants
455 for subnode, subdisk in child_result:
456 if subnode not in my_nodes:
457 result.append((subnode, subdisk))
458 # otherwise child is under our own node, so we ignore this
459 # entry (but probably the other results in the list will
463 def RecordGrow(self, amount):
464 """Update the size of this disk after growth.
466 This method recurses over the disks's children and updates their
467 size correspondigly. The method needs to be kept in sync with the
468 actual algorithms from bdev.
471 if self.dev_type == constants.LD_LV:
473 elif self.dev_type == constants.LD_DRBD8:
475 self.children[0].RecordGrow(amount)
478 raise errors.ProgrammerError("Disk.RecordGrow called for unsupported"
479 " disk type %s" % self.dev_type)
482 """Sets recursively the size to zero for the disk and its children.
486 for child in self.children:
490 def SetPhysicalID(self, target_node, nodes_ip):
491 """Convert the logical ID to the physical ID.
493 This is used only for drbd, which needs ip/port configuration.
495 The routine descends down and updates its children also, because
496 this helps when the only the top device is passed to the remote
500 - target_node: the node we wish to configure for
501 - nodes_ip: a mapping of node name to ip
503 The target_node must exist in in nodes_ip, and must be one of the
504 nodes in the logical ID for each of the DRBD devices encountered
509 for child in self.children:
510 child.SetPhysicalID(target_node, nodes_ip)
512 if self.logical_id is None and self.physical_id is not None:
514 if self.dev_type in constants.LDS_DRBD:
515 pnode, snode, port, pminor, sminor, secret = self.logical_id
516 if target_node not in (pnode, snode):
517 raise errors.ConfigurationError("DRBD device not knowing node %s" %
519 pnode_ip = nodes_ip.get(pnode, None)
520 snode_ip = nodes_ip.get(snode, None)
521 if pnode_ip is None or snode_ip is None:
522 raise errors.ConfigurationError("Can't find primary or secondary node"
523 " for %s" % str(self))
524 p_data = (pnode_ip, port)
525 s_data = (snode_ip, port)
526 if pnode == target_node:
527 self.physical_id = p_data + s_data + (pminor, secret)
528 else: # it must be secondary, we tested above
529 self.physical_id = s_data + p_data + (sminor, secret)
531 self.physical_id = self.logical_id
535 """Disk-specific conversion to standard python types.
537 This replaces the children lists of objects with lists of
538 standard python types.
541 bo = super(Disk, self).ToDict()
543 for attr in ("children",):
544 alist = bo.get(attr, None)
546 bo[attr] = self._ContainerToDicts(alist)
550 def FromDict(cls, val):
551 """Custom function for Disks
554 obj = super(Disk, cls).FromDict(val)
556 obj.children = cls._ContainerFromDicts(obj.children, list, Disk)
557 if obj.logical_id and isinstance(obj.logical_id, list):
558 obj.logical_id = tuple(obj.logical_id)
559 if obj.physical_id and isinstance(obj.physical_id, list):
560 obj.physical_id = tuple(obj.physical_id)
561 if obj.dev_type in constants.LDS_DRBD:
562 # we need a tuple of length six here
563 if len(obj.logical_id) < 6:
564 obj.logical_id += (None,) * (6 - len(obj.logical_id))
568 """Custom str() formatter for disks.
571 if self.dev_type == constants.LD_LV:
572 val = "<LogicalVolume(/dev/%s/%s" % self.logical_id
573 elif self.dev_type in constants.LDS_DRBD:
574 node_a, node_b, port, minor_a, minor_b = self.logical_id[:5]
576 if self.physical_id is None:
579 phy = ("configured as %s:%s %s:%s" %
580 (self.physical_id[0], self.physical_id[1],
581 self.physical_id[2], self.physical_id[3]))
583 val += ("hosts=%s/%d-%s/%d, port=%s, %s, " %
584 (node_a, minor_a, node_b, minor_b, port, phy))
585 if self.children and self.children.count(None) == 0:
586 val += "backend=%s, metadev=%s" % (self.children[0], self.children[1])
588 val += "no local storage"
590 val = ("<Disk(type=%s, logical_id=%s, physical_id=%s, children=%s" %
591 (self.dev_type, self.logical_id, self.physical_id, self.children))
592 if self.iv_name is None:
593 val += ", not visible"
595 val += ", visible as /dev/%s" % self.iv_name
596 if isinstance(self.size, int):
597 val += ", size=%dm)>" % self.size
599 val += ", size='%s')>" % (self.size,)
603 """Checks that this disk is correctly configured.
607 if self.mode not in constants.DISK_ACCESS_SET:
608 all_errors.append("Disk access mode '%s' is invalid" % (self.mode, ))
611 def UpgradeConfig(self):
612 """Fill defaults for missing configuration values.
616 for child in self.children:
617 child.UpgradeConfig()
618 # add here config upgrade for this disk
621 class Instance(TaggableObject):
622 """Config object representing an instance."""
623 __slots__ = TaggableObject.__slots__ + [
636 ] + _TIMESTAMPS + _UUID
638 def _ComputeSecondaryNodes(self):
639 """Compute the list of secondary nodes.
641 This is a simple wrapper over _ComputeAllNodes.
644 all_nodes = set(self._ComputeAllNodes())
645 all_nodes.discard(self.primary_node)
646 return tuple(all_nodes)
648 secondary_nodes = property(_ComputeSecondaryNodes, None, None,
649 "List of secondary nodes")
651 def _ComputeAllNodes(self):
652 """Compute the list of all nodes.
654 Since the data is already there (in the drbd disks), keeping it as
655 a separate normal attribute is redundant and if not properly
656 synchronised can cause problems. Thus it's better to compute it
660 def _Helper(nodes, device):
661 """Recursively computes nodes given a top device."""
662 if device.dev_type in constants.LDS_DRBD:
663 nodea, nodeb = device.logical_id[:2]
667 for child in device.children:
668 _Helper(nodes, child)
671 all_nodes.add(self.primary_node)
672 for device in self.disks:
673 _Helper(all_nodes, device)
674 return tuple(all_nodes)
676 all_nodes = property(_ComputeAllNodes, None, None,
677 "List of all nodes of the instance")
679 def MapLVsByNode(self, lvmap=None, devs=None, node=None):
680 """Provide a mapping of nodes to LVs this instance owns.
682 This function figures out what logical volumes should belong on
683 which nodes, recursing through a device tree.
685 @param lvmap: optional dictionary to receive the
686 'node' : ['lv', ...] data.
688 @return: None if lvmap arg is given, otherwise, a dictionary
689 of the form { 'nodename' : ['volume1', 'volume2', ...], ... }
693 node = self.primary_node
696 lvmap = { node : [] }
699 if not node in lvmap:
707 if dev.dev_type == constants.LD_LV:
708 lvmap[node].append(dev.logical_id[1])
710 elif dev.dev_type in constants.LDS_DRBD:
712 self.MapLVsByNode(lvmap, dev.children, dev.logical_id[0])
713 self.MapLVsByNode(lvmap, dev.children, dev.logical_id[1])
716 self.MapLVsByNode(lvmap, dev.children, node)
720 def FindDisk(self, idx):
721 """Find a disk given having a specified index.
723 This is just a wrapper that does validation of the index.
726 @param idx: the disk index
728 @return: the corresponding disk
729 @raise errors.OpPrereqError: when the given index is not valid
734 return self.disks[idx]
735 except ValueError, err:
736 raise errors.OpPrereqError("Invalid disk index: '%s'" % str(err))
738 raise errors.OpPrereqError("Invalid disk index: %d (instace has disks"
739 " 0 to %d" % (idx, len(self.disks)))
742 """Instance-specific conversion to standard python types.
744 This replaces the children lists of objects with lists of standard
748 bo = super(Instance, self).ToDict()
750 for attr in "nics", "disks":
751 alist = bo.get(attr, None)
753 nlist = self._ContainerToDicts(alist)
760 def FromDict(cls, val):
761 """Custom function for instances.
764 obj = super(Instance, cls).FromDict(val)
765 obj.nics = cls._ContainerFromDicts(obj.nics, list, NIC)
766 obj.disks = cls._ContainerFromDicts(obj.disks, list, Disk)
769 def UpgradeConfig(self):
770 """Fill defaults for missing configuration values.
773 for nic in self.nics:
775 for disk in self.disks:
779 class OS(ConfigObject):
780 """Config object representing an operating system."""
789 "supported_variants",
793 class Node(TaggableObject):
794 """Config object representing a node."""
795 __slots__ = TaggableObject.__slots__ + [
803 ] + _TIMESTAMPS + _UUID
806 class Cluster(TaggableObject):
807 """Config object representing the cluster."""
808 __slots__ = TaggableObject.__slots__ + [
816 "default_hypervisor",
822 "enabled_hypervisors",
826 "candidate_pool_size",
828 ] + _TIMESTAMPS + _UUID
830 def UpgradeConfig(self):
831 """Fill defaults for missing configuration values.
834 if self.hvparams is None:
835 self.hvparams = constants.HVC_DEFAULTS
837 for hypervisor in self.hvparams:
838 self.hvparams[hypervisor] = FillDict(
839 constants.HVC_DEFAULTS[hypervisor], self.hvparams[hypervisor])
841 self.beparams = UpgradeGroupedParams(self.beparams,
842 constants.BEC_DEFAULTS)
843 migrate_default_bridge = not self.nicparams
844 self.nicparams = UpgradeGroupedParams(self.nicparams,
845 constants.NICC_DEFAULTS)
846 if migrate_default_bridge:
847 self.nicparams[constants.PP_DEFAULT][constants.NIC_LINK] = \
850 if self.modify_etc_hosts is None:
851 self.modify_etc_hosts = True
853 # default_bridge is no longer used it 2.1. The slot is left there to
854 # support auto-upgrading, but will be removed in 2.2
855 if self.default_bridge is not None:
856 self.default_bridge = None
858 # default_hypervisor is just the first enabled one in 2.1
859 if self.default_hypervisor is not None:
860 self.enabled_hypervisors = ([self.default_hypervisor] +
861 [hvname for hvname in self.enabled_hypervisors
862 if hvname != self.default_hypervisor])
863 self.default_hypervisor = None
866 """Custom function for cluster.
869 mydict = super(Cluster, self).ToDict()
870 mydict["tcpudp_port_pool"] = list(self.tcpudp_port_pool)
874 def FromDict(cls, val):
875 """Custom function for cluster.
878 obj = super(Cluster, cls).FromDict(val)
879 if not isinstance(obj.tcpudp_port_pool, set):
880 obj.tcpudp_port_pool = set(obj.tcpudp_port_pool)
883 def FillHV(self, instance):
884 """Fill an instance's hvparams dict.
886 @type instance: L{objects.Instance}
887 @param instance: the instance parameter to fill
889 @return: a copy of the instance's hvparams with missing keys filled from
893 return FillDict(self.hvparams.get(instance.hypervisor, {}),
896 def FillBE(self, instance):
897 """Fill an instance's beparams dict.
899 @type instance: L{objects.Instance}
900 @param instance: the instance parameter to fill
902 @return: a copy of the instance's beparams with missing keys filled from
906 return FillDict(self.beparams.get(constants.PP_DEFAULT, {}),
910 class BlockDevStatus(ConfigObject):
911 """Config object representing the status of a block device."""
923 class ConfdRequest(ConfigObject):
924 """Object holding a confd request.
926 @ivar protocol: confd protocol version
927 @ivar type: confd query type
928 @ivar query: query request
929 @ivar rsalt: requested reply salt
940 class ConfdReply(ConfigObject):
941 """Object holding a confd reply.
943 @ivar protocol: confd protocol version
944 @ivar status: reply status code (ok, error)
945 @ivar answer: confd query reply
946 @ivar serial: configuration serial number
957 class SerializableConfigParser(ConfigParser.SafeConfigParser):
958 """Simple wrapper over ConfigParse that allows serialization.
960 This class is basically ConfigParser.SafeConfigParser with two
961 additional methods that allow it to serialize/unserialize to/from a
966 """Dump this instance and return the string representation."""
969 return buf.getvalue()
973 """Load data from a string."""
975 cfp = SerializableConfigParser()