/lib/query.py - snf-ganeti - Greek Research and Technology Network's projects

| Branch: | Tag: | Revision:

root / lib / query.py @ 7925d409

History | View | Annotate | Download (53.8 kB)

+      #
+      #
       # Copyright (C) 2010, 2011 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.
       """Module for query operations
       How it works:
         - Add field definitions
           - See how L{NODE_FIELDS} is built
           - Each field gets:
             - Query field definition (L{objects.QueryFieldDefinition}, use
               L{_MakeField} for creating), containing:
                 - Name, must be lowercase and match L{FIELD_NAME_RE}
                 - Title for tables, must not contain whitespace and match
                   L{TITLE_RE}
                 - Value data type, e.g. L{constants.QFT_NUMBER}
                 - Human-readable description, must not end with punctuation or
                   contain newlines
             - Data request type, see e.g. C{NQ_*}
             - OR-ed flags, see C{QFF_*}
             - A retrieval function, see L{Query.__init__} for description
           - Pass list of fields through L{_PrepareFieldList} for preparation and
             checks
         - Instantiate L{Query} with prepared field list definition and selected fields
         - Call L{Query.RequestedData} to determine what data to collect/compute
         - Call L{Query.Query} or L{Query.OldStyleQuery} with collected data and use
           result
             - Data container must support iteration using C{__iter__}
             - Items are passed to retrieval functions and can have any format
         - Call L{Query.GetFields} to get list of definitions for selected fields
       @attention: Retrieval functions must be idempotent. They can be called multiple
         times, in any order and any number of times.
       """
       import logging
       import operator
       import re
       from ganeti import constants
       from ganeti import errors
       from ganeti import utils
       from ganeti import compat
       from ganeti import objects
       from ganeti import ht
       from ganeti import qlang
       from ganeti.constants import (QFT_UNKNOWN, QFT_TEXT, QFT_BOOL, QFT_NUMBER,
                                     QFT_UNIT, QFT_TIMESTAMP, QFT_OTHER,
                                     RS_NORMAL, RS_UNKNOWN, RS_NODATA,
                                     RS_UNAVAIL, RS_OFFLINE)
       # Constants for requesting data from the caller/data provider. Each property
       # collected/computed separately by the data provider should have its own to
       # only collect the requested data and not more.
       (NQ_CONFIG,
        NQ_INST,
        NQ_LIVE,
        NQ_GROUP,
        NQ_OOB) = range(1, 6)
       (IQ_CONFIG,
        IQ_LIVE,
        IQ_DISKUSAGE,
        IQ_CONSOLE) = range(100, 104)
       (LQ_MODE,
        LQ_OWNER,
        LQ_PENDING) = range(10, 13)
       (GQ_CONFIG,
        GQ_NODE,
        GQ_INST) = range(200, 203)
       # Query field flags
       QFF_HOSTNAME = 0x01
       QFF_IP_ADDRESS = 0x02
       # Next values: 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x100, 0x200
       QFF_ALL = (QFF_HOSTNAME | QFF_IP_ADDRESS)
       FIELD_NAME_RE = re.compile(r"^[a-z0-9/._]+$")
       TITLE_RE = re.compile(r"^[^\s]+$")
       DOC_RE = re.compile(r"^[A-Z].*[^.,?!]$")
       #: Verification function for each field type
       _VERIFY_FN = {
         QFT_UNKNOWN: ht.TNone,
         QFT_TEXT: ht.TString,
         QFT_BOOL: ht.TBool,
         QFT_NUMBER: ht.TInt,
         QFT_UNIT: ht.TInt,
         QFT_TIMESTAMP: ht.TOr(ht.TInt, ht.TFloat),
         QFT_OTHER: lambda _: True,
+        }
       # Unique objects for special field statuses
       _FS_UNKNOWN = object()
       _FS_NODATA = object()
       _FS_UNAVAIL = object()
       _FS_OFFLINE = object()
       #: VType to QFT mapping
       _VTToQFT = {
         # TODO: fix validation of empty strings
         constants.VTYPE_STRING: QFT_OTHER, # since VTYPE_STRINGs can be empty
         constants.VTYPE_MAYBE_STRING: QFT_OTHER,
         constants.VTYPE_BOOL: QFT_BOOL,
         constants.VTYPE_SIZE: QFT_UNIT,
         constants.VTYPE_INT: QFT_NUMBER,
+        }
       _SERIAL_NO_DOC = "%s object serial number, incremented on each modification"
       def _GetUnknownField(ctx, item): # pylint: disable-msg=W0613
         """Gets the contents of an unknown field.
         """
         return _FS_UNKNOWN
       def _GetQueryFields(fielddefs, selected):
         """Calculates the internal list of selected fields.
         Unknown fields are returned as L{constants.QFT_UNKNOWN}.
         @type fielddefs: dict
         @param fielddefs: Field definitions
         @type selected: list of strings
         @param selected: List of selected fields
         """
         result = []
         for name in selected:
           try:
             fdef = fielddefs[name]
           except KeyError:
             fdef = (_MakeField(name, name, QFT_UNKNOWN, "Unknown field '%s'" % name),
                     None, 0, _GetUnknownField)
           assert len(fdef) == 4
           result.append(fdef)
         return result
       def GetAllFields(fielddefs):
         """Extract L{objects.QueryFieldDefinition} from field definitions.
         @rtype: list of L{objects.QueryFieldDefinition}
         """
         return [fdef for (fdef, _, _, _) in fielddefs]
       class _FilterHints:
         """Class for filter analytics.
         When filters are used, the user of the L{Query} class usually doesn't know
         exactly which items will be necessary for building the result. It therefore
         has to prepare and compute the input data for potentially returning
         everything.
         There are two ways to optimize this. The first, and simpler, is to assign
         each field a group of data, so that the caller can determine which
         computations are necessary depending on the data groups requested. The list
         of referenced groups must also be computed for fields referenced in the
         filter.
         The second is restricting the items based on a primary key. The primary key
         is usually a unique name (e.g. a node name). This class extracts all
         referenced names from a filter. If it encounters any filter condition which
         disallows such a list to be determined (e.g. a non-equality filter), all
         names will be requested.
         The end-effect is that any operation other than L{qlang.OP_OR} and
         L{qlang.OP_EQUAL} will make the query more expensive.
         """
         def __init__(self, namefield):
           """Initializes this class.
           @type namefield: string
           @param namefield: Field caller is interested in
           """
           self._namefield = namefield
           #: Whether all names need to be requested (e.g. if a non-equality operator
           #: has been used)
           self._allnames = False
           #: Which names to request
           self._names = None
           #: Data kinds referenced by the filter (used by L{Query.RequestedData})
           self._datakinds = set()
         def RequestedNames(self):
           """Returns all requested values.
           Returns C{None} if list of values can't be determined (e.g. encountered
           non-equality operators).
           @rtype: list
           """
           if self._allnames or self._names is None:
             return None
           return utils.UniqueSequence(self._names)
         def ReferencedData(self):
           """Returns all kinds of data referenced by the filter.
           """
           return frozenset(self._datakinds)
         def _NeedAllNames(self):
           """Changes internal state to request all names.
           """
           self._allnames = True
           self._names = None
         def NoteLogicOp(self, op):
           """Called when handling a logic operation.
           @type op: string
           @param op: Operator
           """
           if op != qlang.OP_OR:
             self._NeedAllNames()
         def NoteUnaryOp(self, op): # pylint: disable-msg=W0613
           """Called when handling an unary operation.
           @type op: string
           @param op: Operator
           """
           self._NeedAllNames()
         def NoteBinaryOp(self, op, datakind, name, value):
           """Called when handling a binary operation.
           @type op: string
           @param op: Operator
           @type name: string
           @param name: Left-hand side of operator (field name)
           @param value: Right-hand side of operator
           """
           if datakind is not None:
             self._datakinds.add(datakind)
           if self._allnames:
             return
           # If any operator other than equality was used, all names need to be
           # retrieved
           if op == qlang.OP_EQUAL and name == self._namefield:
             if self._names is None:
               self._names = []
             self._names.append(value)
           else:
             self._NeedAllNames()
       def _WrapLogicOp(op_fn, sentences, ctx, item):
         """Wrapper for logic operator functions.
         """
         return op_fn(fn(ctx, item) for fn in sentences)
       def _WrapUnaryOp(op_fn, inner, ctx, item):
         """Wrapper for unary operator functions.
         """
         return op_fn(inner(ctx, item))
       def _WrapBinaryOp(op_fn, retrieval_fn, value, ctx, item):
         """Wrapper for binary operator functions.
         """
         return op_fn(retrieval_fn(ctx, item), value)
       def _WrapNot(fn, lhs, rhs):
         """Negates the result of a wrapped function.
         """
         return not fn(lhs, rhs)
       class _FilterCompilerHelper:
         """Converts a query filter to a callable usable for filtering.
         """
         # String statement has no effect, pylint: disable-msg=W0105
         #: How deep filters can be nested
         _LEVELS_MAX = 10
         # Unique identifiers for operator groups
         (_OPTYPE_LOGIC,
          _OPTYPE_UNARY,
          _OPTYPE_BINARY) = range(1, 4)
         """Functions for equality checks depending on field flags.
         List of tuples containing flags and a callable receiving the left- and
         right-hand side of the operator. The flags are an OR-ed value of C{QFF_*}
         (e.g. L{QFF_HOSTNAME}).
         Order matters. The first item with flags will be used. Flags are checked
         using binary AND.
         """
         _EQUALITY_CHECKS = [
           (QFF_HOSTNAME,
            lambda lhs, rhs: utils.MatchNameComponent(rhs, [lhs],
                                                      case_sensitive=False)),
           (None, operator.eq),
+          ]
         """Known operators
         Operator as key (C{qlang.OP_*}), value a tuple of operator group
         (C{_OPTYPE_*}) and a group-specific value:
           - C{_OPTYPE_LOGIC}: Callable taking any number of arguments; used by
             L{_HandleLogicOp}
           - C{_OPTYPE_UNARY}: Callable taking exactly one parameter; used by
             L{_HandleUnaryOp}
           - C{_OPTYPE_BINARY}: Callable taking exactly two parameters, the left- and
             right-hand side of the operator, used by L{_HandleBinaryOp}
         """
         _OPS = {
           # Logic operators
           qlang.OP_OR: (_OPTYPE_LOGIC, compat.any),
           qlang.OP_AND: (_OPTYPE_LOGIC, compat.all),
           # Unary operators
           qlang.OP_NOT: (_OPTYPE_UNARY, operator.not_),
           # Binary operators
           qlang.OP_EQUAL: (_OPTYPE_BINARY, _EQUALITY_CHECKS),
           qlang.OP_NOT_EQUAL:
             (_OPTYPE_BINARY, [(flags, compat.partial(_WrapNot, fn))
                               for (flags, fn) in _EQUALITY_CHECKS]),
           qlang.OP_GLOB: (_OPTYPE_BINARY, NotImplemented),
           qlang.OP_REGEXP: (_OPTYPE_BINARY, NotImplemented),
           qlang.OP_CONTAINS: (_OPTYPE_BINARY, [
             (None, operator.contains),
             ]),
+          }
         def __init__(self, fields):
           """Initializes this class.
           @param fields: Field definitions (return value of L{_PrepareFieldList})
           """
           self._fields = fields
           self._hints = None
           self._op_handler = None
         def __call__(self, hints, filter_):
           """Converts a query filter into a callable function.
           @type hints: L{_FilterHints} or None
           @param hints: Callbacks doing analysis on filter
           @type filter_: list
           @param filter_: Filter structure
           @rtype: callable
           @return: Function receiving context and item as parameters, returning
                    boolean as to whether item matches filter
           """
           self._op_handler = {
             self._OPTYPE_LOGIC:
               (self._HandleLogicOp, getattr(hints, "NoteLogicOp", None)),
             self._OPTYPE_UNARY:
               (self._HandleUnaryOp, getattr(hints, "NoteUnaryOp", None)),
             self._OPTYPE_BINARY:
               (self._HandleBinaryOp, getattr(hints, "NoteBinaryOp", None)),
+            }
           try:
             filter_fn = self._Compile(filter_, 0)
           finally:
             self._op_handler = None
           return filter_fn
         def _Compile(self, filter_, level):
           """Inner function for converting filters.
           Calls the correct handler functions for the top-level operator. This
           function is called recursively (e.g. for logic operators).
           """
           if not (isinstance(filter_, (list, tuple)) and filter_):
             raise errors.ParameterError("Invalid filter on level %s" % level)
           # Limit recursion
           if level >= self._LEVELS_MAX:
             raise errors.ParameterError("Only up to %s levels are allowed (filter"
                                         " nested too deep)" % self._LEVELS_MAX)
           # Create copy to be modified
           operands = filter_[:]
           op = operands.pop(0)
           try:
             (kind, op_data) = self._OPS[op]
           except KeyError:
             raise errors.ParameterError("Unknown operator '%s'" % op)
           (handler, hints_cb) = self._op_handler[kind]
           return handler(hints_cb, level, op, op_data, operands)
         def _HandleLogicOp(self, hints_fn, level, op, op_fn, operands):
           """Handles logic operators.
           @type hints_fn: callable
           @param hints_fn: Callback doing some analysis on the filter
           @type level: integer
           @param level: Current depth
           @type op: string
           @param op: Operator
           @type op_fn: callable
           @param op_fn: Function implementing operator
           @type operands: list
           @param operands: List of operands
           """
           if hints_fn:
             hints_fn(op)
           return compat.partial(_WrapLogicOp, op_fn,
                                 [self._Compile(op, level + 1) for op in operands])
         def _HandleUnaryOp(self, hints_fn, level, op, op_fn, operands):
           """Handles unary operators.
           @type hints_fn: callable
           @param hints_fn: Callback doing some analysis on the filter
           @type level: integer
           @param level: Current depth
           @type op: string
           @param op: Operator
           @type op_fn: callable
           @param op_fn: Function implementing operator
           @type operands: list
           @param operands: List of operands
           """
           if hints_fn:
             hints_fn(op)
           if len(operands) != 1:
             raise errors.ParameterError("Unary operator '%s' expects exactly one"
                                         " operand" % op)
           return compat.partial(_WrapUnaryOp, op_fn,
                                 self._Compile(operands[0], level + 1))
         def _HandleBinaryOp(self, hints_fn, level, op, op_data, operands):
           """Handles binary operators.
           @type hints_fn: callable
           @param hints_fn: Callback doing some analysis on the filter
           @type level: integer
           @param level: Current depth
           @type op: string
           @param op: Operator
           @param op_data: Functions implementing operators
           @type operands: list
           @param operands: List of operands
           """
           # Unused arguments, pylint: disable-msg=W0613
           try:
             (name, value) = operands
           except (ValueError, TypeError):
             raise errors.ParameterError("Invalid binary operator, expected exactly"
                                         " two operands")
           try:
             (fdef, datakind, field_flags, retrieval_fn) = self._fields[name]
           except KeyError:
             raise errors.ParameterError("Unknown field '%s'" % name)
           assert fdef.kind != QFT_UNKNOWN
           # TODO: Type conversions?
           verify_fn = _VERIFY_FN[fdef.kind]
           if not verify_fn(value):
             raise errors.ParameterError("Unable to compare field '%s' (type '%s')"
                                         " with '%s', expected %s" %
                                         (name, fdef.kind, value.__class__.__name__,
                                          verify_fn))
           if hints_fn:
             hints_fn(op, datakind, name, value)
           for (fn_flags, fn) in op_data:
             if fn_flags is None or fn_flags & field_flags:
               return compat.partial(_WrapBinaryOp, fn, retrieval_fn, value)
           raise errors.ProgrammerError("Unable to find operator implementation"
                                        " (op '%s', flags %s)" % (op, field_flags))
       def _CompileFilter(fields, hints, filter_):
         """Converts a query filter into a callable function.
         See L{_FilterCompilerHelper} for details.
         @rtype: callable
         """
         return _FilterCompilerHelper(fields)(hints, filter_)
       class Query:
         def __init__(self, fieldlist, selected, filter_=None, namefield=None):
           """Initializes this class.
           The field definition is a dictionary with the field's name as a key and a
           tuple containing, in order, the field definition object
           (L{objects.QueryFieldDefinition}, the data kind to help calling code
           collect data and a retrieval function. The retrieval function is called
           with two parameters, in order, the data container and the item in container
           (see L{Query.Query}).
           Users of this class can call L{RequestedData} before preparing the data
           container to determine what data is needed.
           @type fieldlist: dictionary
           @param fieldlist: Field definitions
           @type selected: list of strings
           @param selected: List of selected fields
           """
           assert namefield is None or namefield in fieldlist
           self._fields = _GetQueryFields(fieldlist, selected)
           self._filter_fn = None
           self._requested_names = None
           self._filter_datakinds = frozenset()
           if filter_ is not None:
             # Collect requested names if wanted
             if namefield:
               hints = _FilterHints(namefield)
             else:
               hints = None
             # Build filter function
             self._filter_fn = _CompileFilter(fieldlist, hints, filter_)
             if hints:
               self._requested_names = hints.RequestedNames()
               self._filter_datakinds = hints.ReferencedData()
           if namefield is None:
             self._name_fn = None
           else:
             (_, _, _, self._name_fn) = fieldlist[namefield]
         def RequestedNames(self):
           """Returns all names referenced in the filter.
           If there is no filter or operators are preventing determining the exact
           names, C{None} is returned.
           """
           return self._requested_names
         def RequestedData(self):
           """Gets requested kinds of data.
           @rtype: frozenset
           """
           return (self._filter_datakinds |
                   frozenset(datakind for (_, datakind, _, _) in self._fields
                             if datakind is not None))
         def GetFields(self):
           """Returns the list of fields for this query.
           Includes unknown fields.
           @rtype: List of L{objects.QueryFieldDefinition}
           """
           return GetAllFields(self._fields)
         def Query(self, ctx):
           """Execute a query.
           @param ctx: Data container passed to field retrieval functions, must
             support iteration using C{__iter__}
           """
           result = []
           for idx, item in enumerate(ctx):
             if not (self._filter_fn is None or self._filter_fn(ctx, item)):
               continue
             row = [_ProcessResult(fn(ctx, item)) for (_, _, _, fn) in self._fields]
             # Verify result
             if __debug__:
               _VerifyResultRow(self._fields, row)
             if self._name_fn:
               (status, name) = _ProcessResult(self._name_fn(ctx, item))
               assert status == constants.RS_NORMAL
               # TODO: Are there cases where we wouldn't want to use NiceSort?
               sortname = utils.NiceSortKey(name)
             else:
               sortname = None
             result.append((sortname, idx, row))
           # TODO: Would "heapq" be more efficient than sorting?
           # Sorting in-place instead of using "sorted()"
           result.sort()
           assert not result or (len(result[0]) == 3 and len(result[-1]) == 3)
           return map(operator.itemgetter(2), result)
         def OldStyleQuery(self, ctx):
           """Query with "old" query result format.
           See L{Query.Query} for arguments.
           """
           unknown = set(fdef.name for (fdef, _, _, _) in self._fields
                         if fdef.kind == QFT_UNKNOWN)
           if unknown:
             raise errors.OpPrereqError("Unknown output fields selected: %s" %
                                        (utils.CommaJoin(unknown), ),
                                        errors.ECODE_INVAL)
           return [[value for (_, value) in row]
                   for row in self.Query(ctx)]
       def _ProcessResult(value):
         """Converts result values into externally-visible ones.
         """
         if value is _FS_UNKNOWN:
           return (RS_UNKNOWN, None)
         elif value is _FS_NODATA:
           return (RS_NODATA, None)
         elif value is _FS_UNAVAIL:
           return (RS_UNAVAIL, None)
         elif value is _FS_OFFLINE:
           return (RS_OFFLINE, None)
         else:
           return (RS_NORMAL, value)
       def _VerifyResultRow(fields, row):
         """Verifies the contents of a query result row.
         @type fields: list
         @param fields: Field definitions for result
         @type row: list of tuples
         @param row: Row data
         """
         assert len(row) == len(fields)
         errs = []
         for ((status, value), (fdef, _, _, _)) in zip(row, fields):
           if status == RS_NORMAL:
             if not _VERIFY_FN[fdef.kind](value):
               errs.append("normal field %s fails validation (value is %s)" %
                           (fdef.name, value))
           elif value is not None:
             errs.append("abnormal field %s has a non-None value" % fdef.name)
         assert not errs, ("Failed validation: %s in row %s" %
                           (utils.CommaJoin(errors), row))
       def _PrepareFieldList(fields, aliases):
         """Prepares field list for use by L{Query}.
         Converts the list to a dictionary and does some verification.
         @type fields: list of tuples; (L{objects.QueryFieldDefinition}, data
             kind, retrieval function)
         @param fields: List of fields, see L{Query.__init__} for a better
             description
         @type aliases: list of tuples; (alias, target)
         @param aliases: list of tuples containing aliases; for each
             alias/target pair, a duplicate will be created in the field list
         @rtype: dict
         @return: Field dictionary for L{Query}
         """
         if __debug__:
           duplicates = utils.FindDuplicates(fdef.title.lower()
                                             for (fdef, _, _, _) in fields)
           assert not duplicates, "Duplicate title(s) found: %r" % duplicates
         result = {}
         for field in fields:
           (fdef, _, flags, fn) = field
           assert fdef.name and fdef.title, "Name and title are required"
           assert FIELD_NAME_RE.match(fdef.name)
           assert TITLE_RE.match(fdef.title)
           assert (DOC_RE.match(fdef.doc) and len(fdef.doc.splitlines()) == 1 and
                   fdef.doc.strip() == fdef.doc), \
                  "Invalid description for field '%s'" % fdef.name
           assert callable(fn)
           assert fdef.name not in result, \
                  "Duplicate field name '%s' found" % fdef.name
           assert (flags & ~QFF_ALL) == 0, "Unknown flags for field '%s'" % fdef.name
           result[fdef.name] = field
         for alias, target in aliases:
           assert alias not in result, "Alias %s overrides an existing field" % alias
           assert target in result, "Missing target %s for alias %s" % (target, alias)
           (fdef, k, flags, fn) = result[target]
           fdef = fdef.Copy()
           fdef.name = alias
           result[alias] = (fdef, k, flags, fn)
         assert len(result) == len(fields) + len(aliases)
         assert compat.all(name == fdef.name
                           for (name, (fdef, _, _, _)) in result.items())
         return result
       def GetQueryResponse(query, ctx):
         """Prepares the response for a query.
         @type query: L{Query}
         @param ctx: Data container, see L{Query.Query}
         """
         return objects.QueryResponse(data=query.Query(ctx),
                                      fields=query.GetFields()).ToDict()
       def QueryFields(fielddefs, selected):
         """Returns list of available fields.
         @type fielddefs: dict
         @param fielddefs: Field definitions
         @type selected: list of strings
         @param selected: List of selected fields
         @return: List of L{objects.QueryFieldDefinition}
         """
         if selected is None:
           # Client requests all fields, sort by name
           fdefs = utils.NiceSort(GetAllFields(fielddefs.values()),
                                  key=operator.attrgetter("name"))
         else:
           # Keep order as requested by client
           fdefs = Query(fielddefs, selected).GetFields()
         return objects.QueryFieldsResponse(fields=fdefs).ToDict()
       def _MakeField(name, title, kind, doc):
         """Wrapper for creating L{objects.QueryFieldDefinition} instances.
         @param name: Field name as a regular expression
         @param title: Human-readable title
         @param kind: Field type
         @param doc: Human-readable description
         """
         return objects.QueryFieldDefinition(name=name, title=title, kind=kind,
                                             doc=doc)
       def _GetNodeRole(node, master_name):
         """Determine node role.
         @type node: L{objects.Node}
         @param node: Node object
         @type master_name: string
         @param master_name: Master node name
         """
         if node.name == master_name:
           return constants.NR_MASTER
         elif node.master_candidate:
           return constants.NR_MCANDIDATE
         elif node.drained:
           return constants.NR_DRAINED
         elif node.offline:
           return constants.NR_OFFLINE
         else:
           return constants.NR_REGULAR
       def _GetItemAttr(attr):
         """Returns a field function to return an attribute of the item.
         @param attr: Attribute name
         """
         getter = operator.attrgetter(attr)
         return lambda _, item: getter(item)
       def _GetItemTimestamp(getter):
         """Returns function for getting timestamp of item.
         @type getter: callable
         @param getter: Function to retrieve timestamp attribute
         """
         def fn(_, item):
           """Returns a timestamp of item.
           """
           timestamp = getter(item)
           if timestamp is None:
             # Old configs might not have all timestamps
             return _FS_UNAVAIL
           else:
             return timestamp
         return fn
       def _GetItemTimestampFields(datatype):
         """Returns common timestamp fields.
         @param datatype: Field data type for use by L{Query.RequestedData}
         """
         return [
           (_MakeField("ctime", "CTime", QFT_TIMESTAMP, "Creation timestamp"),
            datatype, 0, _GetItemTimestamp(operator.attrgetter("ctime"))),
           (_MakeField("mtime", "MTime", QFT_TIMESTAMP, "Modification timestamp"),
            datatype, 0, _GetItemTimestamp(operator.attrgetter("mtime"))),
+          ]
       class NodeQueryData:
         """Data container for node data queries.
         """
         def __init__(self, nodes, live_data, master_name, node_to_primary,
                      node_to_secondary, groups, oob_support, cluster):
           """Initializes this class.
           """
           self.nodes = nodes
           self.live_data = live_data
           self.master_name = master_name
           self.node_to_primary = node_to_primary
           self.node_to_secondary = node_to_secondary
           self.groups = groups
           self.oob_support = oob_support
           self.cluster = cluster
           # Used for individual rows
           self.curlive_data = None
         def __iter__(self):
           """Iterate over all nodes.
           This function has side-effects and only one instance of the resulting
           generator should be used at a time.
           """
           for node in self.nodes:
             if self.live_data:
               self.curlive_data = self.live_data.get(node.name, None)
             else:
               self.curlive_data = None
             yield node
       #: Fields that are direct attributes of an L{objects.Node} object
       _NODE_SIMPLE_FIELDS = {
         "drained": ("Drained", QFT_BOOL, 0, "Whether node is drained"),
         "master_candidate": ("MasterC", QFT_BOOL, 0,
                              "Whether node is a master candidate"),
         "master_capable": ("MasterCapable", QFT_BOOL, 0,
                            "Whether node can become a master candidate"),
         "name": ("Node", QFT_TEXT, QFF_HOSTNAME, "Node name"),
         "offline": ("Offline", QFT_BOOL, 0, "Whether node is marked offline"),
         "serial_no": ("SerialNo", QFT_NUMBER, 0, _SERIAL_NO_DOC % "Node"),
         "uuid": ("UUID", QFT_TEXT, 0, "Node UUID"),
         "vm_capable": ("VMCapable", QFT_BOOL, 0, "Whether node can host instances"),
+        }
       #: Fields requiring talking to the node
       # Note that none of these are available for non-vm_capable nodes
       _NODE_LIVE_FIELDS = {
         "bootid": ("BootID", QFT_TEXT, "bootid",
                    "Random UUID renewed for each system reboot, can be used"
                    " for detecting reboots by tracking changes"),
         "cnodes": ("CNodes", QFT_NUMBER, "cpu_nodes",
                    "Number of NUMA domains on node (if exported by hypervisor)"),
         "csockets": ("CSockets", QFT_NUMBER, "cpu_sockets",
                      "Number of physical CPU sockets (if exported by hypervisor)"),
         "ctotal": ("CTotal", QFT_NUMBER, "cpu_total", "Number of logical processors"),
         "dfree": ("DFree", QFT_UNIT, "vg_free",
                   "Available disk space in volume group"),
         "dtotal": ("DTotal", QFT_UNIT, "vg_size",
                    "Total disk space in volume group used for instance disk"
                    " allocation"),
         "mfree": ("MFree", QFT_UNIT, "memory_free",
                   "Memory available for instance allocations"),
         "mnode": ("MNode", QFT_UNIT, "memory_dom0",
                   "Amount of memory used by node (dom0 for Xen)"),
         "mtotal": ("MTotal", QFT_UNIT, "memory_total",
                    "Total amount of memory of physical machine"),
+        }
       def _GetGroup(cb):
         """Build function for calling another function with an node group.
         @param cb: The callback to be called with the nodegroup
         """
         def fn(ctx, node):
           """Get group data for a node.
           @type ctx: L{NodeQueryData}
           @type inst: L{objects.Node}
           @param inst: Node object
           """
           ng = ctx.groups.get(node.group, None)
           if ng is None:
             # Nodes always have a group, or the configuration is corrupt
             return _FS_UNAVAIL
           return cb(ctx, node, ng)
         return fn
       def _GetNodeGroup(ctx, node, ng): # pylint: disable-msg=W0613
         """Returns the name of a node's group.
         @type ctx: L{NodeQueryData}
         @type node: L{objects.Node}
         @param node: Node object
         @type ng: L{objects.NodeGroup}
         @param ng: The node group this node belongs to
         """
         return ng.name
       def _GetNodePower(ctx, node):
         """Returns the node powered state
         @type ctx: L{NodeQueryData}
         @type node: L{objects.Node}
         @param node: Node object
         """
         if ctx.oob_support[node.name]:
           return node.powered
         return _FS_UNAVAIL
       def _GetNdParams(ctx, node, ng):
         """Returns the ndparams for this node.
         @type ctx: L{NodeQueryData}
         @type node: L{objects.Node}
         @param node: Node object
         @type ng: L{objects.NodeGroup}
         @param ng: The node group this node belongs to
         """
         return ctx.cluster.SimpleFillND(ng.FillND(node))
       def _GetLiveNodeField(field, kind, ctx, node):
         """Gets the value of a "live" field from L{NodeQueryData}.
         @param field: Live field name
         @param kind: Data kind, one of L{constants.QFT_ALL}
         @type ctx: L{NodeQueryData}
         @type node: L{objects.Node}
         @param node: Node object
         """
         if node.offline:
           return _FS_OFFLINE
         if not node.vm_capable:
           return _FS_UNAVAIL
         if not ctx.curlive_data:
           return _FS_NODATA
         try:
           value = ctx.curlive_data[field]
         except KeyError:
           return _FS_UNAVAIL
         if kind == QFT_TEXT:
           return value
         assert kind in (QFT_NUMBER, QFT_UNIT)
         # Try to convert into number
         try:
           return int(value)
         except (ValueError, TypeError):
           logging.exception("Failed to convert node field '%s' (value %r) to int",
                             value, field)
           return _FS_UNAVAIL
       def _BuildNodeFields():
         """Builds list of fields for node queries.
         """
         fields = [
           (_MakeField("pip", "PrimaryIP", QFT_TEXT, "Primary IP address"),
            NQ_CONFIG, 0, _GetItemAttr("primary_ip")),
           (_MakeField("sip", "SecondaryIP", QFT_TEXT, "Secondary IP address"),
            NQ_CONFIG, 0, _GetItemAttr("secondary_ip")),
           (_MakeField("tags", "Tags", QFT_OTHER, "Tags"), NQ_CONFIG, 0,
            lambda ctx, node: list(node.GetTags())),
           (_MakeField("master", "IsMaster", QFT_BOOL, "Whether node is master"),
            NQ_CONFIG, 0, lambda ctx, node: node.name == ctx.master_name),
           (_MakeField("group", "Group", QFT_TEXT, "Node group"), NQ_GROUP, 0,
            _GetGroup(_GetNodeGroup)),
           (_MakeField("group.uuid", "GroupUUID", QFT_TEXT, "UUID of node group"),
            NQ_CONFIG, 0, _GetItemAttr("group")),
           (_MakeField("powered", "Powered", QFT_BOOL,
                       "Whether node is thought to be powered on"),
            NQ_OOB, 0, _GetNodePower),
           (_MakeField("ndparams", "NodeParameters", QFT_OTHER,
                       "Merged node parameters"),
            NQ_GROUP, 0, _GetGroup(_GetNdParams)),
           (_MakeField("custom_ndparams", "CustomNodeParameters", QFT_OTHER,
                       "Custom node parameters"),
             NQ_GROUP, 0, _GetItemAttr("ndparams")),
+          ]
         # Node role
         role_values = (constants.NR_MASTER, constants.NR_MCANDIDATE,
                        constants.NR_REGULAR, constants.NR_DRAINED,
                        constants.NR_OFFLINE)
         role_doc = ("Node role; \"%s\" for master, \"%s\" for master candidate,"
                     " \"%s\" for regular, \"%s\" for a drained, \"%s\" for offline" %
                     role_values)
         fields.append((_MakeField("role", "Role", QFT_TEXT, role_doc), NQ_CONFIG, 0,
                        lambda ctx, node: _GetNodeRole(node, ctx.master_name)))
         assert set(role_values) == constants.NR_ALL
         def _GetLength(getter):
           return lambda ctx, node: len(getter(ctx)[node.name])
         def _GetList(getter):
           return lambda ctx, node: list(getter(ctx)[node.name])
         # Add fields operating on instance lists
         for prefix, titleprefix, docword, getter in \
             [("p", "Pri", "primary", operator.attrgetter("node_to_primary")),
              ("s", "Sec", "secondary", operator.attrgetter("node_to_secondary"))]:
           # TODO: Allow filterting by hostname in list
           fields.extend([
             (_MakeField("%sinst_cnt" % prefix, "%sinst" % prefix.upper(), QFT_NUMBER,
                         "Number of instances with this node as %s" % docword),
              NQ_INST, 0, _GetLength(getter)),
             (_MakeField("%sinst_list" % prefix, "%sInstances" % titleprefix,
                         QFT_OTHER,
                         "List of instances with this node as %s" % docword),
              NQ_INST, 0, _GetList(getter)),
             ])
         # Add simple fields
         fields.extend([
           (_MakeField(name, title, kind, doc), NQ_CONFIG, flags, _GetItemAttr(name))
           for (name, (title, kind, flags, doc)) in _NODE_SIMPLE_FIELDS.items()
           ])
         # Add fields requiring live data
         fields.extend([
           (_MakeField(name, title, kind, doc), NQ_LIVE, 0,
            compat.partial(_GetLiveNodeField, nfield, kind))
           for (name, (title, kind, nfield, doc)) in _NODE_LIVE_FIELDS.items()
           ])
         # Add timestamps
         fields.extend(_GetItemTimestampFields(NQ_CONFIG))
         return _PrepareFieldList(fields, [])
       class InstanceQueryData:
         """Data container for instance data queries.
         """
         def __init__(self, instances, cluster, disk_usage, offline_nodes, bad_nodes,
                      live_data, wrongnode_inst, console):
           """Initializes this class.
           @param instances: List of instance objects
           @param cluster: Cluster object
           @type disk_usage: dict; instance name as key
           @param disk_usage: Per-instance disk usage
           @type offline_nodes: list of strings
           @param offline_nodes: List of offline nodes
           @type bad_nodes: list of strings
           @param bad_nodes: List of faulty nodes
           @type live_data: dict; instance name as key
           @param live_data: Per-instance live data
           @type wrongnode_inst: set
           @param wrongnode_inst: Set of instances running on wrong node(s)
           @type console: dict; instance name as key
           @param console: Per-instance console information
           """
           assert len(set(bad_nodes) & set(offline_nodes)) == len(offline_nodes), \
                  "Offline nodes not included in bad nodes"
           assert not (set(live_data.keys()) & set(bad_nodes)), \
                  "Found live data for bad or offline nodes"
           self.instances = instances
           self.cluster = cluster
           self.disk_usage = disk_usage
           self.offline_nodes = offline_nodes
           self.bad_nodes = bad_nodes
           self.live_data = live_data
           self.wrongnode_inst = wrongnode_inst
           self.console = console
           # Used for individual rows
           self.inst_hvparams = None
           self.inst_beparams = None
           self.inst_nicparams = None
         def __iter__(self):
           """Iterate over all instances.
           This function has side-effects and only one instance of the resulting
           generator should be used at a time.
           """
           for inst in self.instances:
             self.inst_hvparams = self.cluster.FillHV(inst, skip_globals=True)
             self.inst_beparams = self.cluster.FillBE(inst)
             self.inst_nicparams = [self.cluster.SimpleFillNIC(nic.nicparams)
                                    for nic in inst.nics]
             yield inst
       def _GetInstOperState(ctx, inst):
         """Get instance's operational status.
         @type ctx: L{InstanceQueryData}
         @type inst: L{objects.Instance}
         @param inst: Instance object
         """
         # Can't use RS_OFFLINE here as it would describe the instance to
         # be offline when we actually don't know due to missing data
         if inst.primary_node in ctx.bad_nodes:
           return _FS_NODATA
         else:
           return bool(ctx.live_data.get(inst.name))
       def _GetInstLiveData(name):
         """Build function for retrieving live data.
         @type name: string
         @param name: Live data field name
         """
         def fn(ctx, inst):
           """Get live data for an instance.
           @type ctx: L{InstanceQueryData}
           @type inst: L{objects.Instance}
           @param inst: Instance object
           """
           if (inst.primary_node in ctx.bad_nodes or
               inst.primary_node in ctx.offline_nodes):
             # Can't use RS_OFFLINE here as it would describe the instance to be
             # offline when we actually don't know due to missing data
             return _FS_NODATA
           if inst.name in ctx.live_data:
             data = ctx.live_data[inst.name]
             if name in data:
               return data[name]
           return _FS_UNAVAIL
         return fn
       def _GetInstStatus(ctx, inst):
         """Get instance status.
         @type ctx: L{InstanceQueryData}
         @type inst: L{objects.Instance}
         @param inst: Instance object
         """
         if inst.primary_node in ctx.offline_nodes:
           return constants.INSTST_NODEOFFLINE
         if inst.primary_node in ctx.bad_nodes:
           return constants.INSTST_NODEDOWN
         if bool(ctx.live_data.get(inst.name)):
           if inst.name in ctx.wrongnode_inst:
             return constants.INSTST_WRONGNODE
           elif inst.admin_up:
             return constants.INSTST_RUNNING
           else:
             return constants.INSTST_ERRORUP
         if inst.admin_up:
           return constants.INSTST_ERRORDOWN
         return constants.INSTST_ADMINDOWN
       def _GetInstDiskSize(index):
         """Build function for retrieving disk size.
         @type index: int
         @param index: Disk index
         """
         def fn(_, inst):
           """Get size of a disk.
           @type inst: L{objects.Instance}
           @param inst: Instance object
           """
           try:
             return inst.disks[index].size
           except IndexError:
             return _FS_UNAVAIL
         return fn
       def _GetInstNic(index, cb):
         """Build function for calling another function with an instance NIC.
         @type index: int
         @param index: NIC index
         @type cb: callable
         @param cb: Callback
         """
         def fn(ctx, inst):
           """Call helper function with instance NIC.
           @type ctx: L{InstanceQueryData}
           @type inst: L{objects.Instance}
           @param inst: Instance object
           """
           try:
             nic = inst.nics[index]
           except IndexError:
             return _FS_UNAVAIL
           return cb(ctx, index, nic)
         return fn
       def _GetInstNicIp(ctx, _, nic): # pylint: disable-msg=W0613
         """Get a NIC's IP address.
         @type ctx: L{InstanceQueryData}
         @type nic: L{objects.NIC}
         @param nic: NIC object
         """
         if nic.ip is None:
           return _FS_UNAVAIL
         else:
           return nic.ip
       def _GetInstNicBridge(ctx, index, _):
         """Get a NIC's bridge.
         @type ctx: L{InstanceQueryData}
         @type index: int
         @param index: NIC index
         """
         assert len(ctx.inst_nicparams) >= index
         nicparams = ctx.inst_nicparams[index]
         if nicparams[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
           return nicparams[constants.NIC_LINK]
         else:
           return _FS_UNAVAIL
       def _GetInstAllNicBridges(ctx, inst):
         """Get all network bridges for an instance.
         @type ctx: L{InstanceQueryData}
         @type inst: L{objects.Instance}
         @param inst: Instance object
         """
         assert len(ctx.inst_nicparams) == len(inst.nics)
         result = []
         for nicp in ctx.inst_nicparams:
           if nicp[constants.NIC_MODE] == constants.NIC_MODE_BRIDGED:
             result.append(nicp[constants.NIC_LINK])
           else:
             result.append(None)
         assert len(result) == len(inst.nics)
         return result
       def _GetInstNicParam(name):
         """Build function for retrieving a NIC parameter.
         @type name: string
         @param name: Parameter name
         """
         def fn(ctx, index, _):
           """Get a NIC's bridge.
           @type ctx: L{InstanceQueryData}
           @type inst: L{objects.Instance}
           @param inst: Instance object
           @type nic: L{objects.NIC}
           @param nic: NIC object
           """
           assert len(ctx.inst_nicparams) >= index
           return ctx.inst_nicparams[index][name]
         return fn
       def _GetInstanceNetworkFields():
         """Get instance fields involving network interfaces.
         @return: Tuple containing list of field definitions used as input for
           L{_PrepareFieldList} and a list of aliases
         """
         nic_mac_fn = lambda ctx, _, nic: nic.mac
         nic_mode_fn = _GetInstNicParam(constants.NIC_MODE)
         nic_link_fn = _GetInstNicParam(constants.NIC_LINK)
         fields = [
           # All NICs
           (_MakeField("nic.count", "NICs", QFT_NUMBER,
                       "Number of network interfaces"),
            IQ_CONFIG, 0, lambda ctx, inst: len(inst.nics)),
           (_MakeField("nic.macs", "NIC_MACs", QFT_OTHER,
                       "List containing each network interface's MAC address"),
            IQ_CONFIG, 0, lambda ctx, inst: [nic.mac for nic in inst.nics]),
           (_MakeField("nic.ips", "NIC_IPs", QFT_OTHER,
                       "List containing each network interface's IP address"),
            IQ_CONFIG, 0, lambda ctx, inst: [nic.ip for nic in inst.nics]),
           (_MakeField("nic.modes", "NIC_modes", QFT_OTHER,
                       "List containing each network interface's mode"), IQ_CONFIG, 0,
            lambda ctx, inst: [nicp[constants.NIC_MODE]
                               for nicp in ctx.inst_nicparams]),
           (_MakeField("nic.links", "NIC_links", QFT_OTHER,
                       "List containing each network interface's link"), IQ_CONFIG, 0,
            lambda ctx, inst: [nicp[constants.NIC_LINK]
                               for nicp in ctx.inst_nicparams]),
           (_MakeField("nic.bridges", "NIC_bridges", QFT_OTHER,
                       "List containing each network interface's bridge"),
            IQ_CONFIG, 0, _GetInstAllNicBridges),
+          ]
         # NICs by number
         for i in range(constants.MAX_NICS):
           numtext = utils.FormatOrdinal(i + 1)
           fields.extend([
             (_MakeField("nic.ip/%s" % i, "NicIP/%s" % i, QFT_TEXT,
                         "IP address of %s network interface" % numtext),
              IQ_CONFIG, 0, _GetInstNic(i, _GetInstNicIp)),
             (_MakeField("nic.mac/%s" % i, "NicMAC/%s" % i, QFT_TEXT,
                         "MAC address of %s network interface" % numtext),
              IQ_CONFIG, 0, _GetInstNic(i, nic_mac_fn)),
             (_MakeField("nic.mode/%s" % i, "NicMode/%s" % i, QFT_TEXT,
                         "Mode of %s network interface" % numtext),
              IQ_CONFIG, 0, _GetInstNic(i, nic_mode_fn)),
             (_MakeField("nic.link/%s" % i, "NicLink/%s" % i, QFT_TEXT,
                         "Link of %s network interface" % numtext),
              IQ_CONFIG, 0, _GetInstNic(i, nic_link_fn)),
             (_MakeField("nic.bridge/%s" % i, "NicBridge/%s" % i, QFT_TEXT,
                         "Bridge of %s network interface" % numtext),
              IQ_CONFIG, 0, _GetInstNic(i, _GetInstNicBridge)),
             ])
         aliases = [
           # Legacy fields for first NIC
           ("ip", "nic.ip/0"),
           ("mac", "nic.mac/0"),
           ("bridge", "nic.bridge/0"),
           ("nic_mode", "nic.mode/0"),
           ("nic_link", "nic.link/0"),
+          ]
         return (fields, aliases)
       def _GetInstDiskUsage(ctx, inst):
         """Get disk usage for an instance.
         @type ctx: L{InstanceQueryData}
         @type inst: L{objects.Instance}
         @param inst: Instance object
         """
         usage = ctx.disk_usage[inst.name]
         if usage is None:
           usage = 0
         return usage
       def _GetInstanceConsole(ctx, inst):
         """Get console information for instance.
         @type ctx: L{InstanceQueryData}
         @type inst: L{objects.Instance}
         @param inst: Instance object
         """
         consinfo = ctx.console[inst.name]
         if consinfo is None:
           return _FS_UNAVAIL
         return consinfo
       def _GetInstanceDiskFields():
         """Get instance fields involving disks.
         @return: List of field definitions used as input for L{_PrepareFieldList}
         """
         fields = [
           (_MakeField("disk_usage", "DiskUsage", QFT_UNIT,
                       "Total disk space used by instance on each of its nodes;"
                       " this is not the disk size visible to the instance, but"
                       " the usage on the node"),
            IQ_DISKUSAGE, 0, _GetInstDiskUsage),
           (_MakeField("disk.count", "Disks", QFT_NUMBER, "Number of disks"),
            IQ_CONFIG, 0, lambda ctx, inst: len(inst.disks)),
           (_MakeField("disk.sizes", "Disk_sizes", QFT_OTHER, "List of disk sizes"),
            IQ_CONFIG, 0, lambda ctx, inst: [disk.size for disk in inst.disks]),
+          ]
         # Disks by number
         fields.extend([
           (_MakeField("disk.size/%s" % i, "Disk/%s" % i, QFT_UNIT,
                       "Disk size of %s disk" % utils.FormatOrdinal(i + 1)),
            IQ_CONFIG, 0, _GetInstDiskSize(i))
           for i in range(constants.MAX_DISKS)
           ])
         return fields
       def _GetInstanceParameterFields():
         """Get instance fields involving parameters.
         @return: List of field definitions used as input for L{_PrepareFieldList}
         """
         # TODO: Consider moving titles closer to constants
         be_title = {
           constants.BE_AUTO_BALANCE: "Auto_balance",
           constants.BE_MEMORY: "ConfigMemory",
           constants.BE_VCPUS: "ConfigVCPUs",
+          }
         hv_title = {
           constants.HV_ACPI: "ACPI",
           constants.HV_BOOT_ORDER: "Boot_order",
           constants.HV_CDROM_IMAGE_PATH: "CDROM_image_path",
           constants.HV_DISK_TYPE: "Disk_type",
           constants.HV_INITRD_PATH: "Initrd_path",
           constants.HV_KERNEL_PATH: "Kernel_path",
           constants.HV_NIC_TYPE: "NIC_type",
           constants.HV_PAE: "PAE",
           constants.HV_VNC_BIND_ADDRESS: "VNC_bind_address",
+          }
         fields = [
           # Filled parameters
           (_MakeField("hvparams", "HypervisorParameters", QFT_OTHER,
                       "Hypervisor parameters"),
            IQ_CONFIG, 0, lambda ctx, _: ctx.inst_hvparams),
           (_MakeField("beparams", "BackendParameters", QFT_OTHER,
                       "Backend parameters"),
            IQ_CONFIG, 0, lambda ctx, _: ctx.inst_beparams),
           # Unfilled parameters
           (_MakeField("custom_hvparams", "CustomHypervisorParameters", QFT_OTHER,
                       "Custom hypervisor parameters"),
            IQ_CONFIG, 0, _GetItemAttr("hvparams")),
           (_MakeField("custom_beparams", "CustomBackendParameters", QFT_OTHER,
                       "Custom backend parameters",),
            IQ_CONFIG, 0, _GetItemAttr("beparams")),
           (_MakeField("custom_nicparams", "CustomNicParameters", QFT_OTHER,
                       "Custom network interface parameters"),
            IQ_CONFIG, 0, lambda ctx, inst: [nic.nicparams for nic in inst.nics]),
+          ]
         # HV params
         def _GetInstHvParam(name):
           return lambda ctx, _: ctx.inst_hvparams.get(name, _FS_UNAVAIL)
         fields.extend([
           (_MakeField("hv/%s" % name, hv_title.get(name, "hv/%s" % name),
                       _VTToQFT[kind], "The \"%s\" hypervisor parameter" % name),
            IQ_CONFIG, 0, _GetInstHvParam(name))
           for name, kind in constants.HVS_PARAMETER_TYPES.items()
           if name not in constants.HVC_GLOBALS
           ])
         # BE params
         def _GetInstBeParam(name):
           return lambda ctx, _: ctx.inst_beparams.get(name, None)
         fields.extend([
           (_MakeField("be/%s" % name, be_title.get(name, "be/%s" % name),
                       _VTToQFT[kind], "The \"%s\" backend parameter" % name),
            IQ_CONFIG, 0, _GetInstBeParam(name))
           for name, kind in constants.BES_PARAMETER_TYPES.items()
           ])
         return fields
       _INST_SIMPLE_FIELDS = {
         "disk_template": ("Disk_template", QFT_TEXT, 0, "Instance disk template"),
         "hypervisor": ("Hypervisor", QFT_TEXT, 0, "Hypervisor name"),
         "name": ("Instance", QFT_TEXT, QFF_HOSTNAME, "Instance name"),
         # Depending on the hypervisor, the port can be None
         "network_port": ("Network_port", QFT_OTHER, 0,
                          "Instance network port if available (e.g. for VNC console)"),
         "os": ("OS", QFT_TEXT, 0, "Operating system"),
         "serial_no": ("SerialNo", QFT_NUMBER, 0, _SERIAL_NO_DOC % "Instance"),
         "uuid": ("UUID", QFT_TEXT, 0, "Instance UUID"),
+        }
       def _BuildInstanceFields():
         """Builds list of fields for instance queries.
         """
         fields = [
           (_MakeField("pnode", "Primary_node", QFT_TEXT, "Primary node"),
            IQ_CONFIG, QFF_HOSTNAME, _GetItemAttr("primary_node")),
           # TODO: Allow filtering by secondary node as hostname
           (_MakeField("snodes", "Secondary_Nodes", QFT_OTHER,
                       "Secondary nodes; usually this will just be one node"),
            IQ_CONFIG, 0, lambda ctx, inst: list(inst.secondary_nodes)),
           (_MakeField("admin_state", "Autostart", QFT_BOOL,
                       "Desired state of instance (if set, the instance should be"
                       " up)"),
            IQ_CONFIG, 0, _GetItemAttr("admin_up")),
           (_MakeField("tags", "Tags", QFT_OTHER, "Tags"), IQ_CONFIG, 0,
            lambda ctx, inst: list(inst.GetTags())),
           (_MakeField("console", "Console", QFT_OTHER,
                       "Instance console information"), IQ_CONSOLE, 0,
            _GetInstanceConsole),
+          ]
         # Add simple fields
         fields.extend([
           (_MakeField(name, title, kind, doc), IQ_CONFIG, flags, _GetItemAttr(name))
           for (name, (title, kind, flags, doc)) in _INST_SIMPLE_FIELDS.items()
           ])
         # Fields requiring talking to the node
         fields.extend([
           (_MakeField("oper_state", "Running", QFT_BOOL, "Actual state of instance"),
            IQ_LIVE, 0, _GetInstOperState),
           (_MakeField("oper_ram", "Memory", QFT_UNIT,
                       "Actual memory usage as seen by hypervisor"),
            IQ_LIVE, 0, _GetInstLiveData("memory")),
           (_MakeField("oper_vcpus", "VCPUs", QFT_NUMBER,
                       "Actual number of VCPUs as seen by hypervisor"),
            IQ_LIVE, 0, _GetInstLiveData("vcpus")),
           ])
         # Status field
         status_values = (constants.INSTST_RUNNING, constants.INSTST_ADMINDOWN,
                          constants.INSTST_WRONGNODE, constants.INSTST_ERRORUP,
                          constants.INSTST_ERRORDOWN, constants.INSTST_NODEDOWN,
                          constants.INSTST_NODEOFFLINE)
         status_doc = ("Instance status; \"%s\" if instance is set to be running"
                       " and actually is, \"%s\" if instance is stopped and"
                       " is not running, \"%s\" if instance running, but not on its"
                       " designated primary node, \"%s\" if instance should be"
                       " stopped, but is actually running, \"%s\" if instance should"
                       " run, but doesn't, \"%s\" if instance's primary node is down,"
                       " \"%s\" if instance's primary node is marked offline" %
                       status_values)
         fields.append((_MakeField("status", "Status", QFT_TEXT, status_doc),
                        IQ_LIVE, 0, _GetInstStatus))
         assert set(status_values) == constants.INSTST_ALL, \
                "Status documentation mismatch"
         (network_fields, network_aliases) = _GetInstanceNetworkFields()
         fields.extend(network_fields)
         fields.extend(_GetInstanceParameterFields())
         fields.extend(_GetInstanceDiskFields())
         fields.extend(_GetItemTimestampFields(IQ_CONFIG))
         aliases = [
           ("vcpus", "be/vcpus"),
           ("sda_size", "disk.size/0"),
           ("sdb_size", "disk.size/1"),
           ] + network_aliases
         return _PrepareFieldList(fields, aliases)
       class LockQueryData:
         """Data container for lock data queries.
         """
         def __init__(self, lockdata):
           """Initializes this class.
           """
           self.lockdata = lockdata
         def __iter__(self):
           """Iterate over all locks.
           """
           return iter(self.lockdata)
       def _GetLockOwners(_, data):
         """Returns a sorted list of a lock's current owners.
         """
         (_, _, owners, _) = data
         if owners:
           owners = utils.NiceSort(owners)
         return owners
       def _GetLockPending(_, data):
         """Returns a sorted list of a lock's pending acquires.
         """
         (_, _, _, pending) = data
         if pending:
           pending = [(mode, utils.NiceSort(names))
                      for (mode, names) in pending]
         return pending
       def _BuildLockFields():
         """Builds list of fields for lock queries.
         """
         return _PrepareFieldList([
           # TODO: Lock names are not always hostnames. Should QFF_HOSTNAME be used?
           (_MakeField("name", "Name", QFT_TEXT, "Lock name"), None, 0,
            lambda ctx, (name, mode, owners, pending): name),
           (_MakeField("mode", "Mode", QFT_OTHER,
                       "Mode in which the lock is currently acquired"
                       " (exclusive or shared)"),
            LQ_MODE, 0, lambda ctx, (name, mode, owners, pending): mode),
           (_MakeField("owner", "Owner", QFT_OTHER, "Current lock owner(s)"),
            LQ_OWNER, 0, _GetLockOwners),
           (_MakeField("pending", "Pending", QFT_OTHER,
                       "Threads waiting for the lock"),
            LQ_PENDING, 0, _GetLockPending),
           ], [])
       class GroupQueryData:
         """Data container for node group data queries.
         """
         def __init__(self, groups, group_to_nodes, group_to_instances):
           """Initializes this class.
           @param groups: List of node group objects
           @type group_to_nodes: dict; group UUID as key
           @param group_to_nodes: Per-group list of nodes
           @type group_to_instances: dict; group UUID as key
           @param group_to_instances: Per-group list of (primary) instances
           """
           self.groups = groups
           self.group_to_nodes = group_to_nodes
           self.group_to_instances = group_to_instances
         def __iter__(self):
           """Iterate over all node groups.
           """
           return iter(self.groups)
       _GROUP_SIMPLE_FIELDS = {
         "alloc_policy": ("AllocPolicy", QFT_TEXT, "Allocation policy for group"),
         "name": ("Group", QFT_TEXT, "Group name"),
         "serial_no": ("SerialNo", QFT_NUMBER, _SERIAL_NO_DOC % "Group"),
         "uuid": ("UUID", QFT_TEXT, "Group UUID"),
         "ndparams": ("NDParams", QFT_OTHER, "Node parameters"),
+        }
       def _BuildGroupFields():
         """Builds list of fields for node group queries.
         """
         # Add simple fields
         fields = [(_MakeField(name, title, kind, doc), GQ_CONFIG, 0,
                    _GetItemAttr(name))
                   for (name, (title, kind, doc)) in _GROUP_SIMPLE_FIELDS.items()]
         def _GetLength(getter):
           return lambda ctx, group: len(getter(ctx)[group.uuid])
         def _GetSortedList(getter):
           return lambda ctx, group: utils.NiceSort(getter(ctx)[group.uuid])
         group_to_nodes = operator.attrgetter("group_to_nodes")
         group_to_instances = operator.attrgetter("group_to_instances")
         # Add fields for nodes
         fields.extend([
           (_MakeField("node_cnt", "Nodes", QFT_NUMBER, "Number of nodes"),
            GQ_NODE, 0, _GetLength(group_to_nodes)),
           (_MakeField("node_list", "NodeList", QFT_OTHER, "List of nodes"),
            GQ_NODE, 0, _GetSortedList(group_to_nodes)),
           ])
         # Add fields for instances
         fields.extend([
           (_MakeField("pinst_cnt", "Instances", QFT_NUMBER,
                       "Number of primary instances"),
            GQ_INST, 0, _GetLength(group_to_instances)),
           (_MakeField("pinst_list", "InstanceList", QFT_OTHER,
                       "List of primary instances"),
            GQ_INST, 0, _GetSortedList(group_to_instances)),
           ])
         fields.extend(_GetItemTimestampFields(GQ_CONFIG))
         return _PrepareFieldList(fields, [])
       #: Fields available for node queries
       NODE_FIELDS = _BuildNodeFields()
       #: Fields available for instance queries
       INSTANCE_FIELDS = _BuildInstanceFields()
       #: Fields available for lock queries
       LOCK_FIELDS = _BuildLockFields()
       #: Fields available for node group queries
       GROUP_FIELDS = _BuildGroupFields()
       #: All available resources
       ALL_FIELDS = {
         constants.QR_INSTANCE: INSTANCE_FIELDS,
         constants.QR_NODE: NODE_FIELDS,
         constants.QR_LOCK: LOCK_FIELDS,
         constants.QR_GROUP: GROUP_FIELDS,
+        }
       #: All available field lists
       ALL_FIELD_LISTS = ALL_FIELDS.values()

Synnefo » snf-ganeti

root / lib / query.py @ 7925d409