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+      #
+      #
       # Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.
+      #
       # This program is free software; you can redistribute it and/or modify
       # it under the terms of the GNU General Public License as published by
       # the Free Software Foundation; either version 2 of the License, or
       # (at your option) any later version.
+      #
       # This program is distributed in the hope that it will be useful, but
       # WITHOUT ANY WARRANTY; without even the implied warranty of
       # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       # General Public License for more details.
+      #
       # You should have received a copy of the GNU General Public License
       # along with this program; if not, write to the Free Software
       # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       # 02110-1301, USA.
       """OpCodes module
       This module implements the data structures which define the cluster
       operations - the so-called opcodes.
       Every operation which modifies the cluster state is expressed via
       opcodes.
       """
       # this are practically structures, so disable the message about too
       # few public methods:
       # pylint: disable-msg=R0903
       class BaseOpCode(object):
         """A simple serializable object.
         This object serves as a parent class for OpCode without any custom
         field handling.
         """
         __slots__ = []
         def __init__(self, **kwargs):
           """Constructor for BaseOpCode.
           The constructor takes only keyword arguments and will set
           attributes on this object based on the passed arguments. As such,
           it means that you should not pass arguments which are not in the
           __slots__ attribute for this class.
           """
           slots = self._all_slots()
           for key in kwargs:
             if key not in slots:
               raise TypeError("Object %s doesn't support the parameter '%s'" %
                               (self.__class__.__name__, key))
             setattr(self, key, kwargs[key])
         def __getstate__(self):
           """Generic serializer.
           This method just returns the contents of the instance as a
           dictionary.
           @rtype:  C{dict}
           @return: the instance attributes and their values
           """
           state = {}
           for name in self._all_slots():
             if hasattr(self, name):
               state[name] = getattr(self, name)
           return state
         def __setstate__(self, state):
           """Generic unserializer.
           This method just restores from the serialized state the attributes
           of the current instance.
           @param state: the serialized opcode data
           @type state:  C{dict}
           """
           if not isinstance(state, dict):
             raise ValueError("Invalid data to __setstate__: expected dict, got %s" %
                              type(state))
           for name in self._all_slots():
             if name not in state and hasattr(self, name):
               delattr(self, name)
           for name in state:
             setattr(self, name, state[name])
         @classmethod
         def _all_slots(cls):
           """Compute the list of all declared slots for a class.
           """
           slots = []
           for parent in cls.__mro__:
             slots.extend(getattr(parent, "__slots__", []))
           return slots
       class OpCode(BaseOpCode):
         """Abstract OpCode.
         This is the root of the actual OpCode hierarchy. All clases derived
         from this class should override OP_ID.
         @cvar OP_ID: The ID of this opcode. This should be unique amongst all
                      children of this class.
         @ivar dry_run: Whether the LU should be run in dry-run mode, i.e. just
                        the check steps
         """
         OP_ID = "OP_ABSTRACT"
         __slots__ = ["dry_run", "debug_level"]
         def __getstate__(self):
           """Specialized getstate for opcodes.
           This method adds to the state dictionary the OP_ID of the class,
           so that on unload we can identify the correct class for
           instantiating the opcode.
           @rtype:   C{dict}
           @return:  the state as a dictionary
           """
           data = BaseOpCode.__getstate__(self)
           data["OP_ID"] = self.OP_ID
           return data
         @classmethod
         def LoadOpCode(cls, data):
           """Generic load opcode method.
           The method identifies the correct opcode class from the dict-form
           by looking for a OP_ID key, if this is not found, or its value is
           not available in this module as a child of this class, we fail.
           @type data:  C{dict}
           @param data: the serialized opcode
           """
           if not isinstance(data, dict):
             raise ValueError("Invalid data to LoadOpCode (%s)" % type(data))
           if "OP_ID" not in data:
             raise ValueError("Invalid data to LoadOpcode, missing OP_ID")
           op_id = data["OP_ID"]
           op_class = None
           if op_id in OP_MAPPING:
             op_class = OP_MAPPING[op_id]
           else:
             raise ValueError("Invalid data to LoadOpCode: OP_ID %s unsupported" %
                              op_id)
           op = op_class()
           new_data = data.copy()
           del new_data["OP_ID"]
           op.__setstate__(new_data)
           return op
         def Summary(self):
           """Generates a summary description of this opcode.
           """
           # all OP_ID start with OP_, we remove that
           txt = self.OP_ID[3:]
           field_name = getattr(self, "OP_DSC_FIELD", None)
           if field_name:
             field_value = getattr(self, field_name, None)
             txt = "%s(%s)" % (txt, field_value)
           return txt
       # cluster opcodes
       class OpPostInitCluster(OpCode):
         """Post cluster initialization.
         This opcode does not touch the cluster at all. Its purpose is to run hooks
         after the cluster has been initialized.
         """
         OP_ID = "OP_CLUSTER_POST_INIT"
         __slots__ = []
       class OpDestroyCluster(OpCode):
         """Destroy the cluster.
         This opcode has no other parameters. All the state is irreversibly
         lost after the execution of this opcode.
         """
         OP_ID = "OP_CLUSTER_DESTROY"
         __slots__ = []
       class OpQueryClusterInfo(OpCode):
         """Query cluster information."""
         OP_ID = "OP_CLUSTER_QUERY"
         __slots__ = []
       class OpVerifyCluster(OpCode):
         """Verify the cluster state.
         @type skip_checks: C{list}
         @ivar skip_checks: steps to be skipped from the verify process; this
                            needs to be a subset of
                            L{constants.VERIFY_OPTIONAL_CHECKS}; currently
                            only L{constants.VERIFY_NPLUSONE_MEM} can be passed
         """
         OP_ID = "OP_CLUSTER_VERIFY"
         __slots__ = ["skip_checks", "verbose", "error_codes",
                      "debug_simulate_errors"]
       class OpVerifyDisks(OpCode):
         """Verify the cluster disks.
         Parameters: none
         Result: a tuple of four elements:
           - list of node names with bad data returned (unreachable, etc.)
           - dict of node names with broken volume groups (values: error msg)
           - list of instances with degraded disks (that should be activated)
           - dict of instances with missing logical volumes (values: (node, vol)
             pairs with details about the missing volumes)
         In normal operation, all lists should be empty. A non-empty instance
         list (3rd element of the result) is still ok (errors were fixed) but
         non-empty node list means some node is down, and probably there are
         unfixable drbd errors.
         Note that only instances that are drbd-based are taken into
         consideration. This might need to be revisited in the future.
         """
         OP_ID = "OP_CLUSTER_VERIFY_DISKS"
         __slots__ = []
       class OpRepairDiskSizes(OpCode):
         """Verify the disk sizes of the instances and fixes configuration
         mimatches.
         Parameters: optional instances list, in case we want to restrict the
         checks to only a subset of the instances.
         Result: a list of tuples, (instance, disk, new-size) for changed
         configurations.
         In normal operation, the list should be empty.
         @type instances: list
         @ivar instances: the list of instances to check, or empty for all instances
         """
         OP_ID = "OP_CLUSTER_REPAIR_DISK_SIZES"
         __slots__ = ["instances"]
       class OpQueryConfigValues(OpCode):
         """Query cluster configuration values."""
         OP_ID = "OP_CLUSTER_CONFIG_QUERY"
         __slots__ = ["output_fields"]
       class OpRenameCluster(OpCode):
         """Rename the cluster.
         @type name: C{str}
         @ivar name: The new name of the cluster. The name and/or the master IP
                     address will be changed to match the new name and its IP
                     address.
         """
         OP_ID = "OP_CLUSTER_RENAME"
         OP_DSC_FIELD = "name"
         __slots__ = ["name"]
       class OpSetClusterParams(OpCode):
         """Change the parameters of the cluster.
         @type vg_name: C{str} or C{None}
         @ivar vg_name: The new volume group name or None to disable LVM usage.
         """
         OP_ID = "OP_CLUSTER_SET_PARAMS"
         __slots__ = [
           "vg_name",
           "drbd_helper",
           "enabled_hypervisors",
           "hvparams",
           "os_hvp",
           "beparams",
           "osparams",
           "nicparams",
           "candidate_pool_size",
           "maintain_node_health",
           "uid_pool",
           "add_uids",
           "remove_uids",
           "default_iallocator",
           "reserved_lvs",
+          ]
       class OpRedistributeConfig(OpCode):
         """Force a full push of the cluster configuration.
         """
         OP_ID = "OP_CLUSTER_REDIST_CONF"
         __slots__ = []
       # node opcodes
       class OpRemoveNode(OpCode):
         """Remove a node.
         @type node_name: C{str}
         @ivar node_name: The name of the node to remove. If the node still has
                          instances on it, the operation will fail.
         """
         OP_ID = "OP_NODE_REMOVE"
         OP_DSC_FIELD = "node_name"
         __slots__ = ["node_name"]
       class OpAddNode(OpCode):
         """Add a node to the cluster.
         @type node_name: C{str}
         @ivar node_name: The name of the node to add. This can be a short name,
                          but it will be expanded to the FQDN.
         @type primary_ip: IP address
         @ivar primary_ip: The primary IP of the node. This will be ignored when the
                           opcode is submitted, but will be filled during the node
                           add (so it will be visible in the job query).
         @type secondary_ip: IP address
         @ivar secondary_ip: The secondary IP of the node. This needs to be passed
                             if the cluster has been initialized in 'dual-network'
                             mode, otherwise it must not be given.
         @type readd: C{bool}
         @ivar readd: Whether to re-add an existing node to the cluster. If
                      this is not passed, then the operation will abort if the node
                      name is already in the cluster; use this parameter to 'repair'
                      a node that had its configuration broken, or was reinstalled
                      without removal from the cluster.
         """
         OP_ID = "OP_NODE_ADD"
         OP_DSC_FIELD = "node_name"
         __slots__ = ["node_name", "primary_ip", "secondary_ip", "readd"]
       class OpQueryNodes(OpCode):
         """Compute the list of nodes."""
         OP_ID = "OP_NODE_QUERY"
         __slots__ = ["output_fields", "names", "use_locking"]
       class OpQueryNodeVolumes(OpCode):
         """Get list of volumes on node."""
         OP_ID = "OP_NODE_QUERYVOLS"
         __slots__ = ["nodes", "output_fields"]
       class OpQueryNodeStorage(OpCode):
         """Get information on storage for node(s)."""
         OP_ID = "OP_NODE_QUERY_STORAGE"
         __slots__ = [
           "nodes",
           "storage_type",
           "name",
           "output_fields",
+          ]
       class OpModifyNodeStorage(OpCode):
         """Modifies the properies of a storage unit"""
         OP_ID = "OP_NODE_MODIFY_STORAGE"
         __slots__ = [
           "node_name",
           "storage_type",
           "name",
           "changes",
+          ]
       class OpRepairNodeStorage(OpCode):
         """Repairs the volume group on a node."""
         OP_ID = "OP_REPAIR_NODE_STORAGE"
         OP_DSC_FIELD = "node_name"
         __slots__ = [
           "node_name",
           "storage_type",
           "name",
           "ignore_consistency",
+          ]
       class OpSetNodeParams(OpCode):
         """Change the parameters of a node."""
         OP_ID = "OP_NODE_SET_PARAMS"
         OP_DSC_FIELD = "node_name"
         __slots__ = [
           "node_name",
           "force",
           "master_candidate",
           "offline",
           "drained",
           "auto_promote",
+          ]
       class OpPowercycleNode(OpCode):
         """Tries to powercycle a node."""
         OP_ID = "OP_NODE_POWERCYCLE"
         OP_DSC_FIELD = "node_name"
         __slots__ = [
           "node_name",
           "force",
+          ]
       class OpMigrateNode(OpCode):
         """Migrate all instances from a node."""
         OP_ID = "OP_NODE_MIGRATE"
         OP_DSC_FIELD = "node_name"
         __slots__ = [
           "node_name",
           "mode",
           "live",
+          ]
       class OpNodeEvacuationStrategy(OpCode):
         """Compute the evacuation strategy for a list of nodes."""
         OP_ID = "OP_NODE_EVAC_STRATEGY"
         OP_DSC_FIELD = "nodes"
         __slots__ = ["nodes", "iallocator", "remote_node"]
       # instance opcodes
       class OpCreateInstance(OpCode):
         """Create an instance.
         @ivar instance_name: Instance name
         @ivar mode: Instance creation mode (one of L{constants.INSTANCE_CREATE_MODES})
         @ivar source_handshake: Signed handshake from source (remote import only)
         @ivar source_x509_ca: Source X509 CA in PEM format (remote import only)
         @ivar source_instance_name: Previous name of instance (remote import only)
         """
         OP_ID = "OP_INSTANCE_CREATE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name",
           "os_type", "force_variant", "no_install",
           "pnode", "disk_template", "snode", "mode",
           "disks", "nics",
           "src_node", "src_path", "start", "identify_defaults",
           "wait_for_sync", "ip_check", "name_check",
           "file_storage_dir", "file_driver",
           "iallocator",
           "hypervisor", "hvparams", "beparams", "osparams",
           "source_handshake",
           "source_x509_ca",
           "source_instance_name",
+          ]
       class OpReinstallInstance(OpCode):
         """Reinstall an instance's OS."""
         OP_ID = "OP_INSTANCE_REINSTALL"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name", "os_type", "force_variant"]
       class OpRemoveInstance(OpCode):
         """Remove an instance."""
         OP_ID = "OP_INSTANCE_REMOVE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name",
           "ignore_failures",
           "shutdown_timeout",
+          ]
       class OpRenameInstance(OpCode):
         """Rename an instance."""
         OP_ID = "OP_INSTANCE_RENAME"
         __slots__ = [
           "instance_name", "ip_check", "new_name", "name_check",
+          ]
       class OpStartupInstance(OpCode):
         """Startup an instance."""
         OP_ID = "OP_INSTANCE_STARTUP"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "force", "hvparams", "beparams",
+          ]
       class OpShutdownInstance(OpCode):
         """Shutdown an instance."""
         OP_ID = "OP_INSTANCE_SHUTDOWN"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name", "timeout"]
       class OpRebootInstance(OpCode):
         """Reboot an instance."""
         OP_ID = "OP_INSTANCE_REBOOT"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "reboot_type", "ignore_secondaries", "shutdown_timeout",
+          ]
       class OpReplaceDisks(OpCode):
         """Replace the disks of an instance."""
         OP_ID = "OP_INSTANCE_REPLACE_DISKS"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "remote_node", "mode", "disks", "iallocator",
           "early_release",
+          ]
       class OpFailoverInstance(OpCode):
         """Failover an instance."""
         OP_ID = "OP_INSTANCE_FAILOVER"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "ignore_consistency", "shutdown_timeout",
+          ]
       class OpMigrateInstance(OpCode):
         """Migrate an instance.
         This migrates (without shutting down an instance) to its secondary
         node.
         @ivar instance_name: the name of the instance
         @ivar mode: the migration mode (live, non-live or None for auto)
         """
         OP_ID = "OP_INSTANCE_MIGRATE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name", "mode", "cleanup", "live"]
       class OpMoveInstance(OpCode):
         """Move an instance.
         This move (with shutting down an instance and data copying) to an
         arbitrary node.
         @ivar instance_name: the name of the instance
         @ivar target_node: the destination node
         """
         OP_ID = "OP_INSTANCE_MOVE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "target_node", "shutdown_timeout",
+          ]
       class OpConnectConsole(OpCode):
         """Connect to an instance's console."""
         OP_ID = "OP_INSTANCE_CONSOLE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name"]
       class OpActivateInstanceDisks(OpCode):
         """Activate an instance's disks."""
         OP_ID = "OP_INSTANCE_ACTIVATE_DISKS"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name", "ignore_size"]
       class OpDeactivateInstanceDisks(OpCode):
         """Deactivate an instance's disks."""
         OP_ID = "OP_INSTANCE_DEACTIVATE_DISKS"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name"]
       class OpRecreateInstanceDisks(OpCode):
         """Deactivate an instance's disks."""
         OP_ID = "OP_INSTANCE_RECREATE_DISKS"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name", "disks"]
       class OpQueryInstances(OpCode):
         """Compute the list of instances."""
         OP_ID = "OP_INSTANCE_QUERY"
         __slots__ = ["output_fields", "names", "use_locking"]
       class OpQueryInstanceData(OpCode):
         """Compute the run-time status of instances."""
         OP_ID = "OP_INSTANCE_QUERY_DATA"
         __slots__ = ["instances", "static"]
       class OpSetInstanceParams(OpCode):
         """Change the parameters of an instance."""
         OP_ID = "OP_INSTANCE_SET_PARAMS"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name",
           "hvparams", "beparams", "osparams", "force",
           "nics", "disks", "disk_template",
           "remote_node", "os_name", "force_variant",
+          ]
       class OpGrowDisk(OpCode):
         """Grow a disk of an instance."""
         OP_ID = "OP_INSTANCE_GROW_DISK"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "disk", "amount", "wait_for_sync",
+          ]
       # OS opcodes
       class OpDiagnoseOS(OpCode):
         """Compute the list of guest operating systems."""
         OP_ID = "OP_OS_DIAGNOSE"
         __slots__ = ["output_fields", "names"]
       # Exports opcodes
       class OpQueryExports(OpCode):
         """Compute the list of exported images."""
         OP_ID = "OP_BACKUP_QUERY"
         __slots__ = ["nodes", "use_locking"]
       class OpPrepareExport(OpCode):
         """Prepares an instance export.
         @ivar instance_name: Instance name
         @ivar mode: Export mode (one of L{constants.EXPORT_MODES})
         """
         OP_ID = "OP_BACKUP_PREPARE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           "instance_name", "mode",
+          ]
       class OpExportInstance(OpCode):
         """Export an instance.
         For local exports, the export destination is the node name. For remote
         exports, the export destination is a list of tuples, each consisting of
         hostname/IP address, port, HMAC and HMAC salt. The HMAC is calculated using
         the cluster domain secret over the value "${index}:${hostname}:${port}". The
         destination X509 CA must be a signed certificate.
         @ivar mode: Export mode (one of L{constants.EXPORT_MODES})
         @ivar target_node: Export destination
         @ivar x509_key_name: X509 key to use (remote export only)
         @ivar destination_x509_ca: Destination X509 CA in PEM format (remote export
                                    only)
         """
         OP_ID = "OP_BACKUP_EXPORT"
         OP_DSC_FIELD = "instance_name"
         __slots__ = [
           # TODO: Rename target_node as it changes meaning for different export modes
           # (e.g. "destination")
           "instance_name", "target_node", "shutdown", "shutdown_timeout",
           "remove_instance",
           "ignore_remove_failures",
           "mode",
           "x509_key_name",
           "destination_x509_ca",
+          ]
       class OpRemoveExport(OpCode):
         """Remove an instance's export."""
         OP_ID = "OP_BACKUP_REMOVE"
         OP_DSC_FIELD = "instance_name"
         __slots__ = ["instance_name"]
       # Tags opcodes
       class OpGetTags(OpCode):
         """Returns the tags of the given object."""
         OP_ID = "OP_TAGS_GET"
         OP_DSC_FIELD = "name"
         __slots__ = ["kind", "name"]
       class OpSearchTags(OpCode):
         """Searches the tags in the cluster for a given pattern."""
         OP_ID = "OP_TAGS_SEARCH"
         OP_DSC_FIELD = "pattern"
         __slots__ = ["pattern"]
       class OpAddTags(OpCode):
         """Add a list of tags on a given object."""
         OP_ID = "OP_TAGS_SET"
         __slots__ = ["kind", "name", "tags"]
       class OpDelTags(OpCode):
         """Remove a list of tags from a given object."""
         OP_ID = "OP_TAGS_DEL"
         __slots__ = ["kind", "name", "tags"]
       # Test opcodes
       class OpTestDelay(OpCode):
         """Sleeps for a configured amount of time.
         This is used just for debugging and testing.
         Parameters:
           - duration: the time to sleep
           - on_master: if true, sleep on the master
           - on_nodes: list of nodes in which to sleep
         If the on_master parameter is true, it will execute a sleep on the
         master (before any node sleep).
         If the on_nodes list is not empty, it will sleep on those nodes
         (after the sleep on the master, if that is enabled).
         As an additional feature, the case of duration < 0 will be reported
         as an execution error, so this opcode can be used as a failure
         generator. The case of duration == 0 will not be treated specially.
         """
         OP_ID = "OP_TEST_DELAY"
         OP_DSC_FIELD = "duration"
         __slots__ = ["duration", "on_master", "on_nodes", "repeat"]
       class OpTestAllocator(OpCode):
         """Allocator framework testing.
         This opcode has two modes:
           - gather and return allocator input for a given mode (allocate new
             or replace secondary) and a given instance definition (direction
             'in')
           - run a selected allocator for a given operation (as above) and
             return the allocator output (direction 'out')
         """
         OP_ID = "OP_TEST_ALLOCATOR"
         OP_DSC_FIELD = "allocator"
         __slots__ = [
           "direction", "mode", "allocator", "name",
           "mem_size", "disks", "disk_template",
           "os", "tags", "nics", "vcpus", "hypervisor",
           "evac_nodes",
+          ]
       class OpTestJobqueue(OpCode):
         """Utility opcode to test some aspects of the job queue.
         """
         OP_ID = "OP_TEST_JQUEUE"
         __slots__ = [
           "notify_waitlock",
           "notify_exec",
           "log_messages",
           "fail",
+          ]
       OP_MAPPING = dict([(v.OP_ID, v) for v in globals().values()
                          if (isinstance(v, type) and issubclass(v, OpCode) and
                              hasattr(v, "OP_ID"))])

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