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  """

  OP_ID = "OP_ABSTRACT"

  def __getstate__(self):

    """Specialized getstate for opcodes.

  """

  OP_ID = "OP_CLUSTER_DESTROY"

class OpQueryClusterInfo(OpCode):

  """Query cluster information."""

  OP_ID = "OP_CLUSTER_QUERY"

class OpVerifyCluster(OpCode):

  """

  OP_ID = "OP_CLUSTER_VERIFY"

class OpVerifyDisks(OpCode):

  """

  OP_ID = "OP_CLUSTER_VERIFY_DISKS"

class OpQueryConfigValues(OpCode):

  """Query cluster configuration values."""

  OP_ID = "OP_CLUSTER_CONFIG_QUERY"

class OpRenameCluster(OpCode):

  """

  OP_ID = "OP_CLUSTER_RENAME"

  OP_DSC_FIELD = "name"

class OpSetClusterParams(OpCode):

  """

  OP_ID = "OP_CLUSTER_SET_PARAMS"

    "vg_name",

    "enabled_hypervisors",

    "hvparams",

  """

  OP_ID = "OP_CLUSTER_REDIST_CONF"

    ]

# node opcodes

  """

  OP_ID = "OP_NODE_REMOVE"

  OP_DSC_FIELD = "node_name"

class OpAddNode(OpCode):

  """

  OP_ID = "OP_NODE_ADD"

  OP_DSC_FIELD = "node_name"

class OpQueryNodes(OpCode):

  """Compute the list of nodes."""

  OP_ID = "OP_NODE_QUERY"

class OpQueryNodeVolumes(OpCode):

  """Get list of volumes on node."""

  OP_ID = "OP_NODE_QUERYVOLS"

class OpSetNodeParams(OpCode):

  """Change the parameters of a node."""

  OP_ID = "OP_NODE_SET_PARAMS"

  OP_DSC_FIELD = "node_name"

    "node_name",

    "force",

    "master_candidate",

  """Tries to powercycle a node."""

  OP_ID = "OP_NODE_POWERCYCLE"

  OP_DSC_FIELD = "node_name"

    "node_name",

    "force",

    ]

  """Create an instance."""

  OP_ID = "OP_INSTANCE_CREATE"

  OP_DSC_FIELD = "instance_name"

    "instance_name", "os_type", "pnode",

    "disk_template", "snode", "mode",

    "disks", "nics",

    "file_storage_dir", "file_driver",

    "iallocator",

    "hypervisor", "hvparams", "beparams",

    ]

  """Reinstall an instance's OS."""

  OP_ID = "OP_INSTANCE_REINSTALL"

  OP_DSC_FIELD = "instance_name"

class OpRemoveInstance(OpCode):

  """Remove an instance."""

  OP_ID = "OP_INSTANCE_REMOVE"

  OP_DSC_FIELD = "instance_name"

class OpRenameInstance(OpCode):

  """Rename an instance."""

  OP_ID = "OP_INSTANCE_RENAME"

class OpStartupInstance(OpCode):

  """Startup an instance."""

  OP_ID = "OP_INSTANCE_STARTUP"

  OP_DSC_FIELD = "instance_name"

class OpShutdownInstance(OpCode):

  """Shutdown an instance."""

  OP_ID = "OP_INSTANCE_SHUTDOWN"

  OP_DSC_FIELD = "instance_name"

class OpRebootInstance(OpCode):

  """Reboot an instance."""

  OP_ID = "OP_INSTANCE_REBOOT"

  OP_DSC_FIELD = "instance_name"

class OpReplaceDisks(OpCode):

  """Replace the disks of an instance."""

  OP_ID = "OP_INSTANCE_REPLACE_DISKS"

  OP_DSC_FIELD = "instance_name"

class OpFailoverInstance(OpCode):

  """Failover an instance."""

  OP_ID = "OP_INSTANCE_FAILOVER"

  OP_DSC_FIELD = "instance_name"

class OpMigrateInstance(OpCode):

  """

  OP_ID = "OP_INSTANCE_MIGRATE"

  OP_DSC_FIELD = "instance_name"

class OpConnectConsole(OpCode):

  """Connect to an instance's console."""

  OP_ID = "OP_INSTANCE_CONSOLE"

  OP_DSC_FIELD = "instance_name"

class OpActivateInstanceDisks(OpCode):

  """Activate an instance's disks."""

  OP_ID = "OP_INSTANCE_ACTIVATE_DISKS"

  OP_DSC_FIELD = "instance_name"

class OpDeactivateInstanceDisks(OpCode):

  """Deactivate an instance's disks."""

  OP_ID = "OP_INSTANCE_DEACTIVATE_DISKS"

  OP_DSC_FIELD = "instance_name"

class OpQueryInstances(OpCode):

  """Compute the list of instances."""

  OP_ID = "OP_INSTANCE_QUERY"

class OpQueryInstanceData(OpCode):

  """Compute the run-time status of instances."""

  OP_ID = "OP_INSTANCE_QUERY_DATA"

class OpSetInstanceParams(OpCode):

  """Change the parameters of an instance."""

  OP_ID = "OP_INSTANCE_SET_PARAMS"

  OP_DSC_FIELD = "instance_name"

    "instance_name",

    "hvparams", "beparams", "force",

    "nics", "disks",

  """Grow a disk of an instance."""

  OP_ID = "OP_INSTANCE_GROW_DISK"

  OP_DSC_FIELD = "instance_name"

# OS opcodes

class OpDiagnoseOS(OpCode):

  """Compute the list of guest operating systems."""

  OP_ID = "OP_OS_DIAGNOSE"

# Exports opcodes

class OpQueryExports(OpCode):

  """Compute the list of exported images."""

  OP_ID = "OP_BACKUP_QUERY"

class OpExportInstance(OpCode):

  """Export an instance."""

  OP_ID = "OP_BACKUP_EXPORT"

  OP_DSC_FIELD = "instance_name"

class OpRemoveExport(OpCode):

  """Remove an instance's export."""

  OP_ID = "OP_BACKUP_REMOVE"

  OP_DSC_FIELD = "instance_name"

# Tags opcodes

  """Returns the tags of the given object."""

  OP_ID = "OP_TAGS_GET"

  OP_DSC_FIELD = "name"

class OpSearchTags(OpCode):

  """Searches the tags in the cluster for a given pattern."""

  OP_ID = "OP_TAGS_SEARCH"

  OP_DSC_FIELD = "pattern"

class OpAddTags(OpCode):

  """Add a list of tags on a given object."""

  OP_ID = "OP_TAGS_SET"

class OpDelTags(OpCode):

  """Remove a list of tags from a given object."""

  OP_ID = "OP_TAGS_DEL"

# Test opcodes

  """

  OP_ID = "OP_TEST_DELAY"

  OP_DSC_FIELD = "duration"

class OpTestAllocator(OpCode):

  """

  OP_ID = "OP_TEST_ALLOCATOR"

  OP_DSC_FIELD = "allocator"

    "direction", "mode", "allocator", "name",

    "mem_size", "disks", "disk_template",

    "os", "tags", "nics", "vcpus", "hypervisor",