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#

#

# Copyright (C) 2006, 2007, 2008 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.

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# 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.

"""Remote API base resources library.

"""

import ganeti.cli

import ganeti.opcodes

def BuildUriList(ids, uri_format, uri_fields=("name", "uri")):

  """Builds a URI list as used by index resources.

  Args:

  - ids: List of ids as strings

  - uri_format: Format to be applied for URI

  - uri_fields: Optional parameter for field ids

  """

  (field_id, field_uri) = uri_fields

  def _MapId(m_id):

    return { field_id: m_id, field_uri: uri_format % m_id, }

  # Make sure the result is sorted, makes it nicer to look at and simplifies

  # unittests.

  ids.sort()

  return map(_MapId, ids)

def ExtractField(sequence, index):

  """Creates a list containing one column out of a list of lists.

  Args:

  - sequence: Sequence of lists

  - index: Index of field

  """

  return map(lambda item: item[index], sequence)

def MapFields(names, data):

  """Maps two lists into one dictionary.

  Args:

  - names: Field names (list of strings)

  - data: Field data (list)

  Example:

  >>> MapFields(["a", "b"], ["foo", 123])

  {'a': 'foo', 'b': 123}

  """

  if len(names) != len(data):

    raise AttributeError("Names and data must have the same length")

  return dict(zip(names, data))

def _Tags_GET(kind, name=None):

  """Helper function to retrieve tags.

  """

  if name is None:

    # Do not cause "missing parameter" error, which happens if a parameter

    # is None.

    name = ""

  op = ganeti.opcodes.OpGetTags(kind=kind, name=name)

  tags = ganeti.cli.SubmitOpCode(op)

  return list(tags)

def MapBulkFields(itemslist, fields):

  """Map value to field name in to one dictionary.

  Args:

  - itemslist: A list of items values

  - instance: A list of items names

  Returns:

    A list of mapped dictionaries

  """

  items_details = []

  for item in itemslist:

    mapped = MapFields(fields, item)

    items_details.append(mapped)

  return items_details

class R_Generic(object):

  """Generic class for resources.

  """

  def __init__(self, request, items, queryargs):

    """Generic resource constructor.

    Args:

      request: HTTPRequestHandler object

      items: a list with variables encoded in the URL

      queryargs: a dictionary with additional options from URL

    """

    self.request = request

    self.items = items

    self.queryargs = queryargs