338 lines
12 KiB
Python
338 lines
12 KiB
Python
# Copyright 2011-2012 OpenStack Foundation
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# All Rights Reserved.
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# Copyright 2013 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""The cells extension."""
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from oslo_config import cfg
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import oslo_messaging as messaging
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from oslo_utils import strutils
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import six
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from webob import exc
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from nova.api.openstack import common
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from nova.api.openstack.compute.schemas import cells
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from nova.api.openstack import extensions
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from nova.api.openstack import wsgi
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from nova.api import validation
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from nova.cells import rpcapi as cells_rpcapi
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from nova import exception
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from nova.i18n import _
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from nova import rpc
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CONF = cfg.CONF
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CONF.import_opt('name', 'nova.cells.opts', group='cells')
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CONF.import_opt('capabilities', 'nova.cells.opts', group='cells')
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ALIAS = "os-cells"
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authorize = extensions.os_compute_authorizer(ALIAS)
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def _filter_keys(item, keys):
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"""Filters all model attributes except for keys
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item is a dict
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"""
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return {k: v for k, v in six.iteritems(item) if k in keys}
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def _fixup_cell_info(cell_info, keys):
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"""If the transport_url is present in the cell, derive username,
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rpc_host, and rpc_port from it.
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"""
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if 'transport_url' not in cell_info:
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return
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# Disassemble the transport URL
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transport_url = cell_info.pop('transport_url')
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try:
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transport_url = rpc.get_transport_url(transport_url)
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except messaging.InvalidTransportURL:
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# Just go with None's
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for key in keys:
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cell_info.setdefault(key, None)
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return
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if not transport_url.hosts:
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return
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transport_host = transport_url.hosts[0]
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transport_field_map = {'rpc_host': 'hostname', 'rpc_port': 'port'}
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for key in keys:
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if key in cell_info:
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continue
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transport_field = transport_field_map.get(key, key)
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cell_info[key] = getattr(transport_host, transport_field)
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def _scrub_cell(cell, detail=False):
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keys = ['name', 'username', 'rpc_host', 'rpc_port']
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if detail:
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keys.append('capabilities')
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cell_info = _filter_keys(cell, keys + ['transport_url'])
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_fixup_cell_info(cell_info, keys)
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cell_info['type'] = 'parent' if cell['is_parent'] else 'child'
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return cell_info
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class CellsController(wsgi.Controller):
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"""Controller for Cell resources."""
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def __init__(self):
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self.cells_rpcapi = cells_rpcapi.CellsAPI()
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def _get_cells(self, ctxt, req, detail=False):
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"""Return all cells."""
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# Ask the CellsManager for the most recent data
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items = self.cells_rpcapi.get_cell_info_for_neighbors(ctxt)
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items = common.limited(items, req)
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items = [_scrub_cell(item, detail=detail) for item in items]
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return dict(cells=items)
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@extensions.expected_errors(501)
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@common.check_cells_enabled
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def index(self, req):
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"""Return all cells in brief."""
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ctxt = req.environ['nova.context']
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authorize(ctxt)
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return self._get_cells(ctxt, req)
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@extensions.expected_errors(501)
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@common.check_cells_enabled
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def detail(self, req):
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"""Return all cells in detail."""
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ctxt = req.environ['nova.context']
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authorize(ctxt)
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return self._get_cells(ctxt, req, detail=True)
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@extensions.expected_errors(501)
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@common.check_cells_enabled
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def info(self, req):
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"""Return name and capabilities for this cell."""
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context = req.environ['nova.context']
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authorize(context)
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cell_capabs = {}
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my_caps = CONF.cells.capabilities
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for cap in my_caps:
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key, value = cap.split('=')
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cell_capabs[key] = value
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cell = {'name': CONF.cells.name,
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'type': 'self',
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'rpc_host': None,
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'rpc_port': 0,
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'username': None,
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'capabilities': cell_capabs}
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return dict(cell=cell)
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@extensions.expected_errors((404, 501))
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@common.check_cells_enabled
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def capacities(self, req, id=None):
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"""Return capacities for a given cell or all cells."""
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# TODO(kaushikc): return capacities as a part of cell info and
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# cells detail calls in v2.1, along with capabilities
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context = req.environ['nova.context']
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authorize(context)
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try:
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capacities = self.cells_rpcapi.get_capacities(context,
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cell_name=id)
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except exception.CellNotFound as e:
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raise exc.HTTPNotFound(explanation=e.format_message())
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return dict(cell={"capacities": capacities})
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@extensions.expected_errors((404, 501))
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@common.check_cells_enabled
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def show(self, req, id):
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"""Return data about the given cell name. 'id' is a cell name."""
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context = req.environ['nova.context']
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authorize(context)
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try:
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cell = self.cells_rpcapi.cell_get(context, id)
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except exception.CellNotFound as e:
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raise exc.HTTPNotFound(explanation=e.format_message())
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return dict(cell=_scrub_cell(cell))
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# NOTE(gmann): Returns 200 for backwards compatibility but should be 204
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# as this operation complete the deletion of aggregate resource and return
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# no response body.
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@extensions.expected_errors((403, 404, 501))
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@common.check_cells_enabled
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def delete(self, req, id):
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"""Delete a child or parent cell entry. 'id' is a cell name."""
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context = req.environ['nova.context']
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authorize(context, action="delete")
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try:
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num_deleted = self.cells_rpcapi.cell_delete(context, id)
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except exception.CellsUpdateUnsupported as e:
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raise exc.HTTPForbidden(explanation=e.format_message())
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if num_deleted == 0:
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raise exc.HTTPNotFound(
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explanation=_("Cell %s doesn't exist.") % id)
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def _normalize_cell(self, cell, existing=None):
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"""Normalize input cell data. Normalizations include:
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* Converting cell['type'] to is_parent boolean.
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* Merging existing transport URL with transport information.
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"""
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if 'name' in cell:
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cell['name'] = common.normalize_name(cell['name'])
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# Start with the cell type conversion
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if 'type' in cell:
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cell['is_parent'] = cell['type'] == 'parent'
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del cell['type']
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# Avoid cell type being overwritten to 'child'
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elif existing:
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cell['is_parent'] = existing['is_parent']
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else:
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cell['is_parent'] = False
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# Now we disassemble the existing transport URL...
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transport_url = existing.get('transport_url') if existing else None
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transport_url = rpc.get_transport_url(transport_url)
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if 'rpc_virtual_host' in cell:
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transport_url.virtual_host = cell.pop('rpc_virtual_host')
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if not transport_url.hosts:
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transport_url.hosts.append(messaging.TransportHost())
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transport_host = transport_url.hosts[0]
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if 'rpc_port' in cell:
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cell['rpc_port'] = int(cell['rpc_port'])
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# Copy over the input fields
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transport_field_map = {
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'username': 'username',
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'password': 'password',
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'hostname': 'rpc_host',
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'port': 'rpc_port',
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}
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for key, input_field in transport_field_map.items():
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# Only override the value if we're given an override
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if input_field in cell:
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setattr(transport_host, key, cell.pop(input_field))
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# Now set the transport URL
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cell['transport_url'] = str(transport_url)
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# NOTE(gmann): Returns 200 for backwards compatibility but should be 201
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# as this operation complete the creation of aggregates resource when
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# returning a response.
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@extensions.expected_errors((400, 403, 501))
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@common.check_cells_enabled
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@validation.schema(cells.create_v20, '2.0', '2.0')
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@validation.schema(cells.create, '2.1')
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def create(self, req, body):
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"""Create a child cell entry."""
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context = req.environ['nova.context']
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authorize(context, action="create")
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cell = body['cell']
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self._normalize_cell(cell)
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try:
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cell = self.cells_rpcapi.cell_create(context, cell)
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except exception.CellsUpdateUnsupported as e:
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raise exc.HTTPForbidden(explanation=e.format_message())
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return dict(cell=_scrub_cell(cell))
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@extensions.expected_errors((400, 403, 404, 501))
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@common.check_cells_enabled
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@validation.schema(cells.update_v20, '2.0', '2.0')
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@validation.schema(cells.update, '2.1')
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def update(self, req, id, body):
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"""Update a child cell entry. 'id' is the cell name to update."""
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context = req.environ['nova.context']
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authorize(context, action="update")
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cell = body['cell']
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cell.pop('id', None)
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try:
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# NOTE(Vek): There is a race condition here if multiple
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# callers are trying to update the cell
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# information simultaneously. Since this
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# operation is administrative in nature, and
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# will be going away in the future, I don't see
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# it as much of a problem...
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existing = self.cells_rpcapi.cell_get(context, id)
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except exception.CellNotFound as e:
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raise exc.HTTPNotFound(explanation=e.format_message())
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self._normalize_cell(cell, existing)
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try:
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cell = self.cells_rpcapi.cell_update(context, id, cell)
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except exception.CellNotFound as e:
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raise exc.HTTPNotFound(explanation=e.format_message())
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except exception.CellsUpdateUnsupported as e:
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raise exc.HTTPForbidden(explanation=e.format_message())
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return dict(cell=_scrub_cell(cell))
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# NOTE(gmann): Returns 200 for backwards compatibility but should be 204
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# as this operation complete the sync instance info and return
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# no response body.
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@extensions.expected_errors((400, 501))
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@common.check_cells_enabled
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@validation.schema(cells.sync_instances)
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def sync_instances(self, req, body):
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"""Tell all cells to sync instance info."""
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context = req.environ['nova.context']
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authorize(context, action="sync_instances")
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project_id = body.pop('project_id', None)
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deleted = body.pop('deleted', False)
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updated_since = body.pop('updated_since', None)
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if isinstance(deleted, six.string_types):
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deleted = strutils.bool_from_string(deleted, strict=True)
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self.cells_rpcapi.sync_instances(context, project_id=project_id,
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updated_since=updated_since, deleted=deleted)
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class Cells(extensions.V21APIExtensionBase):
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"""Enables cells-related functionality such as adding neighbor cells,
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listing neighbor cells, and getting the capabilities of the local cell.
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"""
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name = "Cells"
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alias = ALIAS
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version = 1
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def get_resources(self):
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coll_actions = {
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'detail': 'GET',
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'info': 'GET',
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'sync_instances': 'POST',
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'capacities': 'GET',
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}
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memb_actions = {
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'capacities': 'GET',
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}
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res = extensions.ResourceExtension(ALIAS, CellsController(),
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collection_actions=coll_actions,
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member_actions=memb_actions)
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return [res]
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def get_controller_extensions(self):
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return []
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