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#
# -------------------------------------------------------------------------
# Copyright (c) 2019 AT&T Intellectual Property
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# -------------------------------------------------------------------------
#
#!/usr/bin/env python3
from valet.engine.resource_manager.resources.datacenter import Datacenter
from valet.engine.resource_manager.resources.host_group import HostGroup
class TopologyManager(object):
"""Manager to maintain the layout of datacenter."""
def __init__(self, _source, _logger):
self.source = _source
self.datacenter = None
self.host_groups = {}
self.hosts = {}
self.logger = _logger
def get_topology(self, _resource):
"""Set datacenter layout into resource."""
self.logger.info("set datacenter layout...")
# Init first
self.datacenter = Datacenter(_resource.datacenter_id)
self.host_groups.clear()
self.hosts.clear()
if self.source.get_topology(self.datacenter, self.host_groups, self.hosts,
_resource.hosts) != "ok":
return False
self._check_updated(_resource)
return True
def _check_updated(self, _resource):
"""Check if the layout is changed."""
if _resource.datacenter is None:
_resource.datacenter = Datacenter(_resource.datacenter_id)
_resource.datacenter.updated = True
self.logger.info("new datacenter (" + _resource.datacenter_id + ") added")
for hgk in self.host_groups.keys():
if hgk not in _resource.host_groups.keys():
new_host_group = HostGroup(hgk)
new_host_group.host_type = self.host_groups[hgk].host_type
_resource.host_groups[new_host_group.name] = new_host_group
_resource.mark_host_group_updated(hgk)
self.logger.info("new host_group (" + hgk + ") added")
for rhgk in _resource.host_groups.keys():
if rhgk not in self.host_groups.keys():
host_group = _resource.host_groups[rhgk]
host_group.status = "disabled"
host_group.mark_host_group_updated(rhgk)
self.logger.info("host_group (" + rhgk + ") disabled")
# TODO(Gueyoung): what if host exists in topology,
# but does not in resource (DB or platform)?
for rhk in _resource.hosts.keys():
if not _resource.hosts[rhk].is_available():
continue
if rhk not in self.hosts.keys():
_resource.hosts[rhk].status = "disabled"
_resource.mark_host_updated(rhk)
self.logger.info("host (" + rhk + ") removed from topology")
if self._is_datacenter_updated(_resource):
_resource.datacenter.updated = True
for hgk in self.host_groups.keys():
hg = self.host_groups[hgk]
if self._is_host_group_updated(hg, _resource):
_resource.mark_host_group_updated(hgk)
for hk in self.hosts.keys():
if hk in _resource.hosts.keys():
if not _resource.hosts[hk].is_available():
continue
host = self.hosts[hk]
if self._is_host_updated(host, _resource):
_resource.mark_host_updated(hk)
# TODO(Gueyoung): Hierachical failure propagation
def _is_datacenter_updated(self, _resource):
"""Check if datacenter's resources are changed."""
updated = False
_rdatacenter = _resource.datacenter
for rk in self.datacenter.resources.keys():
h = None
if rk in _resource.host_groups.keys():
h = _resource.host_groups[rk]
elif rk in _resource.hosts.keys():
h = _resource.hosts[rk]
if h is not None and h.is_available():
if rk not in _rdatacenter.resources.keys() or h.updated:
_rdatacenter.resources[rk] = h
updated = True
self.logger.info("datacenter updated (new resource)")
for rk in _rdatacenter.resources.keys():
h = None
if rk in _resource.host_groups.keys():
h = _resource.host_groups[rk]
elif rk in _resource.hosts.keys():
h = _resource.hosts[rk]
if h is None or \
not h.is_available() or \
rk not in self.datacenter.resources.keys():
del _rdatacenter.resources[rk]
updated = True
self.logger.info("datacenter updated (resource removed)")
return updated
def _is_host_group_updated(self, _hg, _resource):
"""Check if host_group's parent or children are changed."""
updated = False
_rhg = _resource.host_groups[_hg.name]
if _hg.host_type != _rhg.host_type:
_rhg.host_type = _hg.host_type
updated = True
self.logger.info("host_group (" + _rhg.name + ") updated (hosting type)")
if _rhg.parent_resource is None or \
_rhg.parent_resource.name != _hg.parent_resource.name:
if _hg.parent_resource.name in _resource.host_groups.keys():
hg = _resource.host_groups[_hg.parent_resource.name]
if hg.is_available():
_rhg.parent_resource = hg
updated = True
elif _hg.parent_resource.name == _resource.datacenter.name:
_rhg.parent_resource = _resource.datacenter
updated = True
if updated:
self.logger.info("host_group (" + _rhg.name + ") updated (parent host_group)")
for rk in _hg.child_resources.keys():
h = None
if rk in _resource.hosts.keys():
h = _resource.hosts[rk]
elif rk in _resource.host_groups.keys():
h = _resource.host_groups[rk]
if h is not None and h.is_available():
if rk not in _rhg.child_resources.keys() or h.updated:
_rhg.child_resources[rk] = h
updated = True
self.logger.info("host_group (" + _rhg.name + ") updated (new child host)")
for rk in _rhg.child_resources.keys():
h = None
if rk in _resource.hosts.keys():
h = _resource.hosts[rk]
elif rk in _resource.host_groups.keys():
h = _resource.host_groups[rk]
if h is None or \
not h.is_available() or \
rk not in _hg.child_resources.keys():
del _rhg.child_resources[rk]
updated = True
self.logger.info("host_group (" + _rhg.name + ") updated (child host removed)")
return updated
def _is_host_updated(self, _host, _resource):
"""Check if host's parent (e.g., rack) is changed."""
updated = False
_rhost = _resource.hosts[_host.name]
if _rhost.host_group is None or \
_rhost.host_group.name != _host.host_group.name:
if _host.host_group.name in _resource.host_groups.keys():
rhost_group = _resource.host_groups[_host.host_group.name]
if rhost_group.is_available():
_rhost.host_group = rhost_group
updated = True
elif _host.host_group.name == _resource.datacenter.name:
_rhost.host_group = _resource.datacenter
updated = True
if updated:
self.logger.info("host (" + _rhost.name + ") updated (host_group)")
return False
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