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# Copyright (C) 2006, 2007, 2008, 2009, 2010 Google Inc.

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# General Public License for more details.

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"""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")