root / lib / opcodes.py @ cc4c9b91
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""OpCodes module
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This module implements the data structures which define the cluster
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operations - the so-called opcodes.
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Every operation which modifies the cluster state is expressed via
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opcodes.
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"""
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# this are practically structures, so disable the message about too
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# few public methods:
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# pylint: disable-msg=R0903
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class BaseOpCode(object): |
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"""A simple serializable object.
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This object serves as a parent class for OpCode without any custom
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field handling.
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"""
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__slots__ = [] |
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def __init__(self, **kwargs): |
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"""Constructor for BaseOpCode.
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The constructor takes only keyword arguments and will set
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attributes on this object based on the passed arguments. As such,
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it means that you should not pass arguments which are not in the
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__slots__ attribute for this class.
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"""
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slots = self._all_slots()
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for key in kwargs: |
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if key not in slots: |
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raise TypeError("Object %s doesn't support the parameter '%s'" % |
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(self.__class__.__name__, key))
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setattr(self, key, kwargs[key]) |
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def __getstate__(self): |
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"""Generic serializer.
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This method just returns the contents of the instance as a
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dictionary.
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@rtype: C{dict}
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@return: the instance attributes and their values
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"""
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state = {} |
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for name in self._all_slots(): |
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if hasattr(self, name): |
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state[name] = getattr(self, name) |
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return state
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def __setstate__(self, state): |
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"""Generic unserializer.
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This method just restores from the serialized state the attributes
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of the current instance.
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@param state: the serialized opcode data
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@type state: C{dict}
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"""
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if not isinstance(state, dict): |
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raise ValueError("Invalid data to __setstate__: expected dict, got %s" % |
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type(state))
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for name in self._all_slots(): |
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if name not in state: |
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delattr(self, name) |
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for name in state: |
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setattr(self, name, state[name]) |
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@classmethod
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def _all_slots(cls): |
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"""Compute the list of all declared slots for a class.
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"""
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slots = [] |
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for parent in cls.__mro__: |
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slots.extend(getattr(parent, "__slots__", [])) |
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return slots
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class OpCode(BaseOpCode): |
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"""Abstract OpCode.
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This is the root of the actual OpCode hierarchy. All clases derived
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from this class should override OP_ID.
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@cvar OP_ID: The ID of this opcode. This should be unique amongst all
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children of this class.
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@ivar dry_run: Whether the LU should be run in dry-run mode, i.e. just
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the check steps
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"""
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OP_ID = "OP_ABSTRACT"
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__slots__ = ["dry_run", "debug_level"] |
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def __getstate__(self): |
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"""Specialized getstate for opcodes.
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This method adds to the state dictionary the OP_ID of the class,
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so that on unload we can identify the correct class for
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instantiating the opcode.
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@rtype: C{dict}
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@return: the state as a dictionary
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"""
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data = BaseOpCode.__getstate__(self)
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data["OP_ID"] = self.OP_ID |
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return data
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@classmethod
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def LoadOpCode(cls, data): |
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"""Generic load opcode method.
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The method identifies the correct opcode class from the dict-form
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by looking for a OP_ID key, if this is not found, or its value is
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not available in this module as a child of this class, we fail.
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@type data: C{dict}
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@param data: the serialized opcode
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"""
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if not isinstance(data, dict): |
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raise ValueError("Invalid data to LoadOpCode (%s)" % type(data)) |
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if "OP_ID" not in data: |
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raise ValueError("Invalid data to LoadOpcode, missing OP_ID") |
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op_id = data["OP_ID"]
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op_class = None
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if op_id in OP_MAPPING: |
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op_class = OP_MAPPING[op_id] |
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else:
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raise ValueError("Invalid data to LoadOpCode: OP_ID %s unsupported" % |
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op_id) |
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op = op_class() |
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new_data = data.copy() |
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del new_data["OP_ID"] |
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op.__setstate__(new_data) |
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return op
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def Summary(self): |
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"""Generates a summary description of this opcode.
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"""
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# all OP_ID start with OP_, we remove that
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txt = self.OP_ID[3:] |
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field_name = getattr(self, "OP_DSC_FIELD", None) |
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if field_name:
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field_value = getattr(self, field_name, None) |
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txt = "%s(%s)" % (txt, field_value)
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return txt
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# cluster opcodes
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class OpPostInitCluster(OpCode): |
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"""Post cluster initialization.
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This opcode does not touch the cluster at all. Its purpose is to run hooks
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after the cluster has been initialized.
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"""
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OP_ID = "OP_CLUSTER_POST_INIT"
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__slots__ = [] |
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class OpDestroyCluster(OpCode): |
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"""Destroy the cluster.
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This opcode has no other parameters. All the state is irreversibly
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lost after the execution of this opcode.
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"""
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OP_ID = "OP_CLUSTER_DESTROY"
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__slots__ = [] |
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class OpQueryClusterInfo(OpCode): |
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"""Query cluster information."""
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OP_ID = "OP_CLUSTER_QUERY"
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__slots__ = [] |
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class OpVerifyCluster(OpCode): |
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"""Verify the cluster state.
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@type skip_checks: C{list}
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@ivar skip_checks: steps to be skipped from the verify process; this
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needs to be a subset of
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L{constants.VERIFY_OPTIONAL_CHECKS}; currently
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only L{constants.VERIFY_NPLUSONE_MEM} can be passed
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"""
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OP_ID = "OP_CLUSTER_VERIFY"
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__slots__ = ["skip_checks", "verbose", "error_codes", |
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"debug_simulate_errors"]
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class OpVerifyDisks(OpCode): |
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"""Verify the cluster disks.
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Parameters: none
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Result: a tuple of four elements:
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- list of node names with bad data returned (unreachable, etc.)
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- dict of node names with broken volume groups (values: error msg)
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- list of instances with degraded disks (that should be activated)
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- dict of instances with missing logical volumes (values: (node, vol)
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pairs with details about the missing volumes)
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In normal operation, all lists should be empty. A non-empty instance
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list (3rd element of the result) is still ok (errors were fixed) but
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non-empty node list means some node is down, and probably there are
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unfixable drbd errors.
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Note that only instances that are drbd-based are taken into
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consideration. This might need to be revisited in the future.
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"""
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OP_ID = "OP_CLUSTER_VERIFY_DISKS"
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__slots__ = [] |
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class OpRepairDiskSizes(OpCode): |
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"""Verify the disk sizes of the instances and fixes configuration
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mimatches.
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Parameters: optional instances list, in case we want to restrict the
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checks to only a subset of the instances.
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Result: a list of tuples, (instance, disk, new-size) for changed
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configurations.
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In normal operation, the list should be empty.
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@type instances: list
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@ivar instances: the list of instances to check, or empty for all instances
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"""
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OP_ID = "OP_CLUSTER_REPAIR_DISK_SIZES"
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__slots__ = ["instances"]
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class OpQueryConfigValues(OpCode): |
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"""Query cluster configuration values."""
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OP_ID = "OP_CLUSTER_CONFIG_QUERY"
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__slots__ = ["output_fields"]
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class OpRenameCluster(OpCode): |
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"""Rename the cluster.
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@type name: C{str}
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@ivar name: The new name of the cluster. The name and/or the master IP
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address will be changed to match the new name and its IP
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address.
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"""
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OP_ID = "OP_CLUSTER_RENAME"
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OP_DSC_FIELD = "name"
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__slots__ = ["name"]
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class OpSetClusterParams(OpCode): |
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"""Change the parameters of the cluster.
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@type vg_name: C{str} or C{None}
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@ivar vg_name: The new volume group name or None to disable LVM usage.
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"""
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OP_ID = "OP_CLUSTER_SET_PARAMS"
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__slots__ = [ |
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"vg_name",
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"enabled_hypervisors",
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"hvparams",
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"beparams",
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"nicparams",
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"candidate_pool_size",
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] |
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class OpRedistributeConfig(OpCode): |
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"""Force a full push of the cluster configuration.
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"""
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OP_ID = "OP_CLUSTER_REDIST_CONF"
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__slots__ = [] |
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# node opcodes
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class OpRemoveNode(OpCode): |
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"""Remove a node.
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@type node_name: C{str}
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@ivar node_name: The name of the node to remove. If the node still has
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instances on it, the operation will fail.
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"""
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OP_ID = "OP_NODE_REMOVE"
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OP_DSC_FIELD = "node_name"
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__slots__ = ["node_name"]
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class OpAddNode(OpCode): |
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"""Add a node to the cluster.
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@type node_name: C{str}
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@ivar node_name: The name of the node to add. This can be a short name,
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but it will be expanded to the FQDN.
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@type primary_ip: IP address
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@ivar primary_ip: The primary IP of the node. This will be ignored when the
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opcode is submitted, but will be filled during the node
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add (so it will be visible in the job query).
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@type secondary_ip: IP address
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@ivar secondary_ip: The secondary IP of the node. This needs to be passed
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if the cluster has been initialized in 'dual-network'
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mode, otherwise it must not be given.
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@type readd: C{bool}
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@ivar readd: Whether to re-add an existing node to the cluster. If
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this is not passed, then the operation will abort if the node
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name is already in the cluster; use this parameter to 'repair'
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a node that had its configuration broken, or was reinstalled
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without removal from the cluster.
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"""
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OP_ID = "OP_NODE_ADD"
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OP_DSC_FIELD = "node_name"
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__slots__ = ["node_name", "primary_ip", "secondary_ip", "readd"] |
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class OpQueryNodes(OpCode): |
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"""Compute the list of nodes."""
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OP_ID = "OP_NODE_QUERY"
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__slots__ = ["output_fields", "names", "use_locking"] |
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class OpQueryNodeVolumes(OpCode): |
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"""Get list of volumes on node."""
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OP_ID = "OP_NODE_QUERYVOLS"
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__slots__ = ["nodes", "output_fields"] |
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class OpQueryNodeStorage(OpCode): |
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"""Get information on storage for node(s)."""
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OP_ID = "OP_NODE_QUERY_STORAGE"
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__slots__ = [ |
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"nodes",
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"storage_type",
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"name",
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"output_fields",
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] |
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class OpModifyNodeStorage(OpCode): |
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"""Modifies the properies of a storage unit"""
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OP_ID = "OP_NODE_MODIFY_STORAGE"
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__slots__ = [ |
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"node_name",
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"storage_type",
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"name",
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"changes",
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] |
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class OpRepairNodeStorage(OpCode): |
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"""Repairs the volume group on a node."""
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OP_ID = "OP_REPAIR_NODE_STORAGE"
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OP_DSC_FIELD = "node_name"
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__slots__ = [ |
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"node_name",
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"storage_type",
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"name",
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"ignore_consistency",
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] |
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class OpSetNodeParams(OpCode): |
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"""Change the parameters of a node."""
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OP_ID = "OP_NODE_SET_PARAMS"
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OP_DSC_FIELD = "node_name"
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__slots__ = [ |
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"node_name",
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"force",
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"master_candidate",
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"offline",
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"drained",
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] |
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class OpPowercycleNode(OpCode): |
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"""Tries to powercycle a node."""
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OP_ID = "OP_NODE_POWERCYCLE"
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OP_DSC_FIELD = "node_name"
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__slots__ = [ |
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"node_name",
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"force",
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] |
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class OpEvacuateNode(OpCode): |
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"""Relocate secondary instances from a node."""
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OP_ID = "OP_NODE_EVACUATE"
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OP_DSC_FIELD = "node_name"
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__slots__ = [ |
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"node_name", "remote_node", "iallocator", "early_release", |
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] |
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class OpMigrateNode(OpCode): |
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"""Migrate all instances from a node."""
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OP_ID = "OP_NODE_MIGRATE"
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OP_DSC_FIELD = "node_name"
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__slots__ = [ |
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"node_name",
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"live",
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] |
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class OpNodeEvacuationStrategy(OpCode): |
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"""Compute the evacuation strategy for a list of nodes."""
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OP_ID = "OP_NODE_EVAC_STRATEGY"
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OP_DSC_FIELD = "nodes"
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__slots__ = ["nodes", "iallocator", "remote_node"] |
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# instance opcodes
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class OpCreateInstance(OpCode): |
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"""Create an instance."""
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OP_ID = "OP_INSTANCE_CREATE"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name", "os_type", "force_variant", |
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"pnode", "disk_template", "snode", "mode", |
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"disks", "nics", |
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"src_node", "src_path", "start", |
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"wait_for_sync", "ip_check", "name_check", |
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"file_storage_dir", "file_driver", |
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"iallocator",
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"hypervisor", "hvparams", "beparams", |
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"dry_run",
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] |
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class OpReinstallInstance(OpCode): |
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"""Reinstall an instance's OS."""
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OP_ID = "OP_INSTANCE_REINSTALL"
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OP_DSC_FIELD = "instance_name"
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__slots__ = ["instance_name", "os_type", "force_variant"] |
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class OpRemoveInstance(OpCode): |
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"""Remove an instance."""
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OP_ID = "OP_INSTANCE_REMOVE"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name",
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"ignore_failures",
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"shutdown_timeout",
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] |
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class OpRenameInstance(OpCode): |
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"""Rename an instance."""
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OP_ID = "OP_INSTANCE_RENAME"
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__slots__ = [ |
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"instance_name", "ignore_ip", "new_name", |
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] |
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class OpStartupInstance(OpCode): |
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"""Startup an instance."""
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OP_ID = "OP_INSTANCE_STARTUP"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name", "force", "hvparams", "beparams", |
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] |
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class OpShutdownInstance(OpCode): |
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"""Shutdown an instance."""
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OP_ID = "OP_INSTANCE_SHUTDOWN"
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OP_DSC_FIELD = "instance_name"
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__slots__ = ["instance_name", "timeout"] |
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|
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class OpRebootInstance(OpCode): |
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"""Reboot an instance."""
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OP_ID = "OP_INSTANCE_REBOOT"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name", "reboot_type", "ignore_secondaries", "shutdown_timeout", |
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] |
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|
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|
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class OpReplaceDisks(OpCode): |
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"""Replace the disks of an instance."""
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OP_ID = "OP_INSTANCE_REPLACE_DISKS"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name", "remote_node", "mode", "disks", "iallocator", |
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"early_release",
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] |
532 |
|
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|
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class OpFailoverInstance(OpCode): |
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"""Failover an instance."""
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OP_ID = "OP_INSTANCE_FAILOVER"
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OP_DSC_FIELD = "instance_name"
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__slots__ = [ |
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"instance_name", "ignore_consistency", "shutdown_timeout", |
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] |
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|
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|
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class OpMigrateInstance(OpCode): |
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"""Migrate an instance.
|
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|
546 |
This migrates (without shutting down an instance) to its secondary
|
547 |
node.
|
548 |
|
549 |
@ivar instance_name: the name of the instance
|
550 |
|
551 |
"""
|
552 |
OP_ID = "OP_INSTANCE_MIGRATE"
|
553 |
OP_DSC_FIELD = "instance_name"
|
554 |
__slots__ = ["instance_name", "live", "cleanup"] |
555 |
|
556 |
|
557 |
class OpMoveInstance(OpCode): |
558 |
"""Move an instance.
|
559 |
|
560 |
This move (with shutting down an instance and data copying) to an
|
561 |
arbitrary node.
|
562 |
|
563 |
@ivar instance_name: the name of the instance
|
564 |
@ivar target_node: the destination node
|
565 |
|
566 |
"""
|
567 |
OP_ID = "OP_INSTANCE_MOVE"
|
568 |
OP_DSC_FIELD = "instance_name"
|
569 |
__slots__ = [ |
570 |
"instance_name", "target_node", "shutdown_timeout", |
571 |
] |
572 |
|
573 |
|
574 |
class OpConnectConsole(OpCode): |
575 |
"""Connect to an instance's console."""
|
576 |
OP_ID = "OP_INSTANCE_CONSOLE"
|
577 |
OP_DSC_FIELD = "instance_name"
|
578 |
__slots__ = ["instance_name"]
|
579 |
|
580 |
|
581 |
class OpActivateInstanceDisks(OpCode): |
582 |
"""Activate an instance's disks."""
|
583 |
OP_ID = "OP_INSTANCE_ACTIVATE_DISKS"
|
584 |
OP_DSC_FIELD = "instance_name"
|
585 |
__slots__ = ["instance_name", "ignore_size"] |
586 |
|
587 |
|
588 |
class OpDeactivateInstanceDisks(OpCode): |
589 |
"""Deactivate an instance's disks."""
|
590 |
OP_ID = "OP_INSTANCE_DEACTIVATE_DISKS"
|
591 |
OP_DSC_FIELD = "instance_name"
|
592 |
__slots__ = ["instance_name"]
|
593 |
|
594 |
|
595 |
class OpRecreateInstanceDisks(OpCode): |
596 |
"""Deactivate an instance's disks."""
|
597 |
OP_ID = "OP_INSTANCE_RECREATE_DISKS"
|
598 |
OP_DSC_FIELD = "instance_name"
|
599 |
__slots__ = ["instance_name", "disks"] |
600 |
|
601 |
|
602 |
class OpQueryInstances(OpCode): |
603 |
"""Compute the list of instances."""
|
604 |
OP_ID = "OP_INSTANCE_QUERY"
|
605 |
__slots__ = ["output_fields", "names", "use_locking"] |
606 |
|
607 |
|
608 |
class OpQueryInstanceData(OpCode): |
609 |
"""Compute the run-time status of instances."""
|
610 |
OP_ID = "OP_INSTANCE_QUERY_DATA"
|
611 |
__slots__ = ["instances", "static"] |
612 |
|
613 |
|
614 |
class OpSetInstanceParams(OpCode): |
615 |
"""Change the parameters of an instance."""
|
616 |
OP_ID = "OP_INSTANCE_SET_PARAMS"
|
617 |
OP_DSC_FIELD = "instance_name"
|
618 |
__slots__ = [ |
619 |
"instance_name",
|
620 |
"hvparams", "beparams", "force", |
621 |
"nics", "disks", |
622 |
] |
623 |
|
624 |
|
625 |
class OpGrowDisk(OpCode): |
626 |
"""Grow a disk of an instance."""
|
627 |
OP_ID = "OP_INSTANCE_GROW_DISK"
|
628 |
OP_DSC_FIELD = "instance_name"
|
629 |
__slots__ = [ |
630 |
"instance_name", "disk", "amount", "wait_for_sync", |
631 |
] |
632 |
|
633 |
|
634 |
# OS opcodes
|
635 |
class OpDiagnoseOS(OpCode): |
636 |
"""Compute the list of guest operating systems."""
|
637 |
OP_ID = "OP_OS_DIAGNOSE"
|
638 |
__slots__ = ["output_fields", "names"] |
639 |
|
640 |
|
641 |
# Exports opcodes
|
642 |
class OpQueryExports(OpCode): |
643 |
"""Compute the list of exported images."""
|
644 |
OP_ID = "OP_BACKUP_QUERY"
|
645 |
__slots__ = ["nodes", "use_locking"] |
646 |
|
647 |
|
648 |
class OpExportInstance(OpCode): |
649 |
"""Export an instance."""
|
650 |
OP_ID = "OP_BACKUP_EXPORT"
|
651 |
OP_DSC_FIELD = "instance_name"
|
652 |
__slots__ = [ |
653 |
"instance_name", "target_node", "shutdown", "shutdown_timeout", |
654 |
] |
655 |
|
656 |
|
657 |
class OpRemoveExport(OpCode): |
658 |
"""Remove an instance's export."""
|
659 |
OP_ID = "OP_BACKUP_REMOVE"
|
660 |
OP_DSC_FIELD = "instance_name"
|
661 |
__slots__ = ["instance_name"]
|
662 |
|
663 |
|
664 |
# Tags opcodes
|
665 |
class OpGetTags(OpCode): |
666 |
"""Returns the tags of the given object."""
|
667 |
OP_ID = "OP_TAGS_GET"
|
668 |
OP_DSC_FIELD = "name"
|
669 |
__slots__ = ["kind", "name"] |
670 |
|
671 |
|
672 |
class OpSearchTags(OpCode): |
673 |
"""Searches the tags in the cluster for a given pattern."""
|
674 |
OP_ID = "OP_TAGS_SEARCH"
|
675 |
OP_DSC_FIELD = "pattern"
|
676 |
__slots__ = ["pattern"]
|
677 |
|
678 |
|
679 |
class OpAddTags(OpCode): |
680 |
"""Add a list of tags on a given object."""
|
681 |
OP_ID = "OP_TAGS_SET"
|
682 |
__slots__ = ["kind", "name", "tags"] |
683 |
|
684 |
|
685 |
class OpDelTags(OpCode): |
686 |
"""Remove a list of tags from a given object."""
|
687 |
OP_ID = "OP_TAGS_DEL"
|
688 |
__slots__ = ["kind", "name", "tags"] |
689 |
|
690 |
|
691 |
# Test opcodes
|
692 |
class OpTestDelay(OpCode): |
693 |
"""Sleeps for a configured amount of time.
|
694 |
|
695 |
This is used just for debugging and testing.
|
696 |
|
697 |
Parameters:
|
698 |
- duration: the time to sleep
|
699 |
- on_master: if true, sleep on the master
|
700 |
- on_nodes: list of nodes in which to sleep
|
701 |
|
702 |
If the on_master parameter is true, it will execute a sleep on the
|
703 |
master (before any node sleep).
|
704 |
|
705 |
If the on_nodes list is not empty, it will sleep on those nodes
|
706 |
(after the sleep on the master, if that is enabled).
|
707 |
|
708 |
As an additional feature, the case of duration < 0 will be reported
|
709 |
as an execution error, so this opcode can be used as a failure
|
710 |
generator. The case of duration == 0 will not be treated specially.
|
711 |
|
712 |
"""
|
713 |
OP_ID = "OP_TEST_DELAY"
|
714 |
OP_DSC_FIELD = "duration"
|
715 |
__slots__ = ["duration", "on_master", "on_nodes"] |
716 |
|
717 |
|
718 |
class OpTestAllocator(OpCode): |
719 |
"""Allocator framework testing.
|
720 |
|
721 |
This opcode has two modes:
|
722 |
- gather and return allocator input for a given mode (allocate new
|
723 |
or replace secondary) and a given instance definition (direction
|
724 |
'in')
|
725 |
- run a selected allocator for a given operation (as above) and
|
726 |
return the allocator output (direction 'out')
|
727 |
|
728 |
"""
|
729 |
OP_ID = "OP_TEST_ALLOCATOR"
|
730 |
OP_DSC_FIELD = "allocator"
|
731 |
__slots__ = [ |
732 |
"direction", "mode", "allocator", "name", |
733 |
"mem_size", "disks", "disk_template", |
734 |
"os", "tags", "nics", "vcpus", "hypervisor", |
735 |
"evac_nodes",
|
736 |
] |
737 |
|
738 |
|
739 |
OP_MAPPING = dict([(v.OP_ID, v) for v in globals().values() |
740 |
if (isinstance(v, type) and issubclass(v, OpCode) and |
741 |
hasattr(v, "OP_ID"))]) |