482 lines
18 KiB
Python
482 lines
18 KiB
Python
# Copyright (c) 2012 Rackspace Hosting
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# All Rights Reserved.
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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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"""
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CellState Manager
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"""
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import copy
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import datetime
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import functools
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from oslo.config import cfg
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from nova.cells import rpc_driver
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from nova import context
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from nova.db import base
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from nova import exception
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from nova.openstack.common import fileutils
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import jsonutils
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from nova.openstack.common import log as logging
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from nova.openstack.common import timeutils
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from nova import utils
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cell_state_manager_opts = [
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cfg.IntOpt('db_check_interval',
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default=60,
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help='Seconds between getting fresh cell info from db.'),
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cfg.StrOpt('cells_config',
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help='Configuration file from which to read cells '
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'configuration. If given, overrides reading cells '
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'from the database.'),
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]
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LOG = logging.getLogger(__name__)
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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('reserve_percent', 'nova.cells.opts', group='cells')
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CONF.import_opt('mute_child_interval', 'nova.cells.opts', group='cells')
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#CONF.import_opt('capabilities', 'nova.cells.opts', group='cells')
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CONF.register_opts(cell_state_manager_opts, group='cells')
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class CellState(object):
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"""Holds information for a particular cell."""
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def __init__(self, cell_name, is_me=False):
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self.name = cell_name
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self.is_me = is_me
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self.last_seen = datetime.datetime.min
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self.capabilities = {}
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self.capacities = {}
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self.db_info = {}
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# TODO(comstud): The DB will specify the driver to use to talk
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# to this cell, but there's no column for this yet. The only
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# available driver is the rpc driver.
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self.driver = rpc_driver.CellsRPCDriver()
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def update_db_info(self, cell_db_info):
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"""Update cell credentials from db."""
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self.db_info = dict(
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[(k, v) for k, v in cell_db_info.iteritems()
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if k != 'name'])
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def update_capabilities(self, cell_metadata):
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"""Update cell capabilities for a cell."""
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self.last_seen = timeutils.utcnow()
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self.capabilities = cell_metadata
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def update_capacities(self, capacities):
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"""Update capacity information for a cell."""
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self.last_seen = timeutils.utcnow()
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self.capacities = capacities
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def get_cell_info(self):
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"""Return subset of cell information for OS API use."""
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db_fields_to_return = ['is_parent', 'weight_scale', 'weight_offset']
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url_fields_to_return = {
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'username': 'username',
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'hostname': 'rpc_host',
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'port': 'rpc_port',
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}
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cell_info = dict(name=self.name, capabilities=self.capabilities)
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if self.db_info:
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for field in db_fields_to_return:
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cell_info[field] = self.db_info[field]
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url_info = rpc_driver.parse_transport_url(
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self.db_info['transport_url'])
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for field, canonical in url_fields_to_return.items():
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cell_info[canonical] = url_info[field]
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return cell_info
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def send_message(self, message):
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"""Send a message to a cell. Just forward this to the driver,
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passing ourselves and the message as arguments.
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"""
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self.driver.send_message_to_cell(self, message)
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def __repr__(self):
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me = "me" if self.is_me else "not_me"
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return "Cell '%s' (%s)" % (self.name, me)
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def sync_before(f):
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"""Use as a decorator to wrap methods that use cell information to
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make sure they sync the latest information from the DB periodically.
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"""
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@functools.wraps(f)
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def wrapper(self, *args, **kwargs):
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self._cell_data_sync()
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return f(self, *args, **kwargs)
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return wrapper
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def sync_after(f):
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"""Use as a decorator to wrap methods that update cell information
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in the database to make sure the data is synchronized immediately.
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"""
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@functools.wraps(f)
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def wrapper(self, *args, **kwargs):
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result = f(self, *args, **kwargs)
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self._cell_data_sync(force=True)
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return result
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return wrapper
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_unset = object()
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class CellStateManager(base.Base):
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def __new__(cls, cell_state_cls=None, cells_config=_unset):
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if cls is not CellStateManager:
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return super(CellStateManager, cls).__new__(cls)
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if cells_config is _unset:
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cells_config = CONF.cells.cells_config
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if cells_config:
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config_path = CONF.find_file(cells_config)
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if not config_path:
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raise cfg.ConfigFilesNotFoundError(path=config_path)
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return CellStateManagerFile(cell_state_cls, config_path)
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return CellStateManagerDB(cell_state_cls)
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def __init__(self, cell_state_cls=None):
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super(CellStateManager, self).__init__()
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if not cell_state_cls:
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cell_state_cls = CellState
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self.cell_state_cls = cell_state_cls
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self.my_cell_state = cell_state_cls(CONF.cells.name, is_me=True)
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self.parent_cells = {}
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self.child_cells = {}
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self.last_cell_db_check = datetime.datetime.min
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self._cell_data_sync(force=True)
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my_cell_capabs = {}
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for cap in CONF.cells.capabilities:
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name, value = cap.split('=', 1)
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if ';' in value:
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values = set(value.split(';'))
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else:
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values = set([value])
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my_cell_capabs[name] = values
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self.my_cell_state.update_capabilities(my_cell_capabs)
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def _refresh_cells_from_dict(self, db_cells_dict):
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"""Make our cell info map match the db."""
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# Update current cells. Delete ones that disappeared
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for cells_dict in (self.parent_cells, self.child_cells):
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for cell_name, cell_info in cells_dict.items():
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is_parent = cell_info.db_info['is_parent']
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db_dict = db_cells_dict.get(cell_name)
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if db_dict and is_parent == db_dict['is_parent']:
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cell_info.update_db_info(db_dict)
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else:
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del cells_dict[cell_name]
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# Add new cells
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for cell_name, db_info in db_cells_dict.items():
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if db_info['is_parent']:
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cells_dict = self.parent_cells
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else:
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cells_dict = self.child_cells
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if cell_name not in cells_dict:
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cells_dict[cell_name] = self.cell_state_cls(cell_name)
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cells_dict[cell_name].update_db_info(db_info)
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def _time_to_sync(self):
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"""Is it time to sync the DB against our memory cache?"""
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diff = timeutils.utcnow() - self.last_cell_db_check
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return diff.seconds >= CONF.cells.db_check_interval
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def _update_our_capacity(self, ctxt=None):
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"""Update our capacity in the self.my_cell_state CellState.
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This will add/update 2 entries in our CellState.capacities,
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'ram_free' and 'disk_free'.
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The values of these are both dictionaries with the following
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format:
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{'total_mb': <total_memory_free_in_the_cell>,
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'units_by_mb: <units_dictionary>}
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<units_dictionary> contains the number of units that we can
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build for every instance_type that we have. This number is
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computed by looking at room available on every compute_node.
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Take the following instance_types as an example:
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[{'memory_mb': 1024, 'root_gb': 10, 'ephemeral_gb': 100},
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{'memory_mb': 2048, 'root_gb': 20, 'ephemeral_gb': 200}]
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capacities['ram_free']['units_by_mb'] would contain the following:
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{'1024': <number_of_instances_that_will_fit>,
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'2048': <number_of_instances_that_will_fit>}
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capacities['disk_free']['units_by_mb'] would contain the following:
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{'122880': <number_of_instances_that_will_fit>,
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'225280': <number_of_instances_that_will_fit>}
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Units are in MB, so 122880 = (10 + 100) * 1024.
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NOTE(comstud): Perhaps we should only report a single number
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available per instance_type.
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"""
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if not ctxt:
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ctxt = context.get_admin_context()
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reserve_level = CONF.cells.reserve_percent / 100.0
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compute_hosts = {}
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def _get_compute_hosts():
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compute_nodes = self.db.compute_node_get_all(ctxt)
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for compute in compute_nodes:
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service = compute['service']
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if not service or service['disabled']:
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continue
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host = service['host']
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compute_hosts[host] = {
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'free_ram_mb': compute['free_ram_mb'],
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'free_disk_mb': compute['free_disk_gb'] * 1024,
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'total_ram_mb': compute['memory_mb'],
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'total_disk_mb': compute['local_gb'] * 1024}
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_get_compute_hosts()
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if not compute_hosts:
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self.my_cell_state.update_capacities({})
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return
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ram_mb_free_units = {}
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disk_mb_free_units = {}
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total_ram_mb_free = 0
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total_disk_mb_free = 0
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def _free_units(total, free, per_inst):
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if per_inst:
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min_free = total * reserve_level
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free = max(0, free - min_free)
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return int(free / per_inst)
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else:
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return 0
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def _update_from_values(values, instance_type):
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memory_mb = instance_type['memory_mb']
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disk_mb = (instance_type['root_gb'] +
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instance_type['ephemeral_gb']) * 1024
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ram_mb_free_units.setdefault(str(memory_mb), 0)
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disk_mb_free_units.setdefault(str(disk_mb), 0)
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ram_free_units = _free_units(compute_values['total_ram_mb'],
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compute_values['free_ram_mb'], memory_mb)
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disk_free_units = _free_units(compute_values['total_disk_mb'],
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compute_values['free_disk_mb'], disk_mb)
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ram_mb_free_units[str(memory_mb)] += ram_free_units
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disk_mb_free_units[str(disk_mb)] += disk_free_units
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instance_types = self.db.flavor_get_all(ctxt)
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for compute_values in compute_hosts.values():
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total_ram_mb_free += compute_values['free_ram_mb']
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total_disk_mb_free += compute_values['free_disk_mb']
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for instance_type in instance_types:
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_update_from_values(compute_values, instance_type)
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capacities = {'ram_free': {'total_mb': total_ram_mb_free,
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'units_by_mb': ram_mb_free_units},
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'disk_free': {'total_mb': total_disk_mb_free,
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'units_by_mb': disk_mb_free_units}}
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self.my_cell_state.update_capacities(capacities)
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@sync_before
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def get_cell_info_for_neighbors(self):
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"""Return cell information for all neighbor cells."""
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cell_list = [cell.get_cell_info()
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for cell in self.child_cells.itervalues()]
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cell_list.extend([cell.get_cell_info()
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for cell in self.parent_cells.itervalues()])
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return cell_list
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@sync_before
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def get_my_state(self):
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"""Return information for my (this) cell."""
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return self.my_cell_state
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@sync_before
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def get_child_cells(self):
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"""Return list of child cell_infos."""
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return self.child_cells.values()
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@sync_before
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def get_parent_cells(self):
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"""Return list of parent cell_infos."""
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return self.parent_cells.values()
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@sync_before
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def get_parent_cell(self, cell_name):
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return self.parent_cells.get(cell_name)
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@sync_before
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def get_child_cell(self, cell_name):
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return self.child_cells.get(cell_name)
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@sync_before
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def update_cell_capabilities(self, cell_name, capabilities):
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"""Update capabilities for a cell."""
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cell = (self.child_cells.get(cell_name) or
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self.parent_cells.get(cell_name))
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if not cell:
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LOG.error(_("Unknown cell '%(cell_name)s' when trying to "
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"update capabilities"),
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{'cell_name': cell_name})
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return
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# Make sure capabilities are sets.
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for capab_name, values in capabilities.items():
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capabilities[capab_name] = set(values)
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cell.update_capabilities(capabilities)
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@sync_before
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def update_cell_capacities(self, cell_name, capacities):
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"""Update capacities for a cell."""
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cell = (self.child_cells.get(cell_name) or
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self.parent_cells.get(cell_name))
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if not cell:
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LOG.error(_("Unknown cell '%(cell_name)s' when trying to "
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"update capacities"),
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{'cell_name': cell_name})
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return
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cell.update_capacities(capacities)
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@sync_before
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def get_our_capabilities(self, include_children=True):
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capabs = copy.deepcopy(self.my_cell_state.capabilities)
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if include_children:
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for cell in self.child_cells.values():
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if timeutils.is_older_than(cell.last_seen,
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CONF.cells.mute_child_interval):
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continue
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for capab_name, values in cell.capabilities.items():
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if capab_name not in capabs:
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capabs[capab_name] = set([])
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capabs[capab_name] |= values
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return capabs
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def _add_to_dict(self, target, src):
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for key, value in src.items():
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if isinstance(value, dict):
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target.setdefault(key, {})
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self._add_to_dict(target[key], value)
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continue
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target.setdefault(key, 0)
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target[key] += value
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@sync_before
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def get_our_capacities(self, include_children=True):
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capacities = copy.deepcopy(self.my_cell_state.capacities)
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if include_children:
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for cell in self.child_cells.values():
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self._add_to_dict(capacities, cell.capacities)
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return capacities
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@sync_before
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def get_capacities(self, cell_name=None):
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if not cell_name or cell_name == self.my_cell_state.name:
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return self.get_our_capacities()
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if cell_name in self.child_cells:
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return self.child_cells[cell_name].capacities
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raise exception.CellNotFound(cell_name=cell_name)
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@sync_before
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def cell_get(self, ctxt, cell_name):
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for cells_dict in (self.parent_cells, self.child_cells):
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if cell_name in cells_dict:
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return cells_dict[cell_name]
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raise exception.CellNotFound(cell_name=cell_name)
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class CellStateManagerDB(CellStateManager):
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@utils.synchronized('cell-db-sync')
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def _cell_data_sync(self, force=False):
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"""
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Update cell status for all cells from the backing data store
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when necessary.
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:param force: If True, cell status will be updated regardless
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of whether it's time to do so.
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"""
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if force or self._time_to_sync():
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LOG.debug(_("Updating cell cache from db."))
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self.last_cell_db_check = timeutils.utcnow()
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ctxt = context.get_admin_context()
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db_cells = self.db.cell_get_all(ctxt)
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db_cells_dict = dict((cell['name'], cell) for cell in db_cells)
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self._refresh_cells_from_dict(db_cells_dict)
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self._update_our_capacity(ctxt)
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@sync_after
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def cell_create(self, ctxt, values):
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return self.db.cell_create(ctxt, values)
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@sync_after
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def cell_update(self, ctxt, cell_name, values):
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return self.db.cell_update(ctxt, cell_name, values)
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@sync_after
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def cell_delete(self, ctxt, cell_name):
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return self.db.cell_delete(ctxt, cell_name)
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class CellStateManagerFile(CellStateManager):
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def __init__(self, cell_state_cls, cells_config_path):
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self.cells_config_path = cells_config_path
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super(CellStateManagerFile, self).__init__(cell_state_cls)
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def _cell_data_sync(self, force=False):
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"""
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Update cell status for all cells from the backing data store
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when necessary.
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:param force: If True, cell status will be updated regardless
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of whether it's time to do so.
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"""
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reloaded, data = fileutils.read_cached_file(self.cells_config_path,
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force_reload=force)
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if reloaded:
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LOG.debug(_("Updating cell cache from config file."))
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self.cells_config_data = jsonutils.loads(data)
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self._refresh_cells_from_dict(self.cells_config_data)
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if force or self._time_to_sync():
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self.last_cell_db_check = timeutils.utcnow()
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self._update_our_capacity()
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def cell_create(self, ctxt, values):
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raise exception.CellsUpdateProhibited()
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def cell_update(self, ctxt, cell_name, values):
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raise exception.CellsUpdateProhibited()
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def cell_delete(self, ctxt, cell_name):
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raise exception.CellsUpdateProhibited()
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