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# Copyright (c) 2020 Mirantis Inc.
#
# 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.
"""
Nova Client
"""
import itertools
import re
import time
from novaclient import client as nova_client_pkg
from oslo_log import log as logging
LOG = logging.getLogger(__name__)
class ForbiddenException(nova_client_pkg.exceptions.Forbidden):
"""
Custome Exception
"""
def get_available_compute_nodes(nova_client, flavor_name):
"""
Return available compute nodes
"""
try:
host_list = [dict(host=svc.host, zone=svc.zone)
for svc in
nova_client.services.list(binary='nova-compute')
if svc.state == 'up' and svc.status == 'enabled']
# If the flavor has aggregate_instance_extra_specs set then filter
# host_list to pick only the hosts matching the chosen flavor.
flavor = get_flavor(nova_client, flavor_name)
if flavor is not None:
extra_specs = flavor.get_keys()
for item in extra_specs:
if "aggregate_instance_extra_specs" in item:
LOG.debug('Flavor contains %s, using compute node '
'filtering', extra_specs)
# getting the extra spec seting for flavor in the
# standard format of extra_spec:value
extra_spec = item.split(":")[1]
extra_spec_value = extra_specs.get(item)
# create a set of aggregate host which match
agg_hosts = set(itertools.chain(
*[agg.hosts for agg in
nova_client.aggregates.list() if
agg.metadata.get(extra_spec) == extra_spec_value]))
# update list of available hosts with
# host_aggregate cross-check
host_list = [elem for elem in host_list if
elem['host'] in agg_hosts]
LOG.debug('Available compute nodes: %s ', host_list)
return host_list
except nova_client_pkg.exceptions.Forbidden as error:
msg = 'Forbidden to get list of compute nodes'
raise ForbiddenException(msg) from error
def does_flavor_exist(nova_client, flavor_name):
"""
Check if flavor exists
"""
for flavor in nova_client.flavors.list():
if flavor.name == flavor_name:
return True
return False
def create_flavor(nova_client, **kwargs):
"""
Create a flavor
"""
try:
nova_client.flavors.create(**kwargs)
except nova_client_pkg.exceptions.Forbidden as error:
msg = 'Forbidden to create flavor'
raise ForbiddenException(msg) from error
def get_server_ip(nova_client, server_name, ip_type):
"""
Get IP of the compute
"""
server = nova_client.servers.find(name=server_name)
addresses = server.addresses
ips = [v['addr'] for v in itertools.chain(*addresses.values())
if v['OS-EXT-IPS:type'] == ip_type]
if not ips:
raise Exception('Could not get IP address of server: %s' % server_name)
if len(ips) > 1:
raise Exception('Server %s has more than one IP addresses: %s' %
(server_name, ips))
return ips[0]
def get_server_host_id(nova_client, server_name):
"""
Get the host id
"""
server = nova_client.servers.find(name=server_name)
return server.hostId
def check_server_console(nova_client, server_id, len_limit=100):
"""
Check Server console
"""
try:
console = (nova_client.servers.get(server_id)
.get_console_output(len_limit))
except nova_client_pkg.exceptions.ClientException as exc:
LOG.warning('Error retrieving console output: %s. Ignoring', exc)
return None
for line in console.splitlines():
if (re.search(r'\[critical\]', line, flags=re.IGNORECASE) or
re.search(r'Cloud-init.*Datasource DataSourceNone\.', line)):
message = ('Instance %(id)s has critical cloud-init error: '
'%(msg)s. Check metadata service availability' %
dict(id=server_id, msg=line))
LOG.error(message)
return message
if re.search(r'\[error', line, flags=re.IGNORECASE):
LOG.error('Error message in instance %(id)s console: %(msg)s',
dict(id=server_id, msg=line))
elif re.search(r'warn', line, flags=re.IGNORECASE):
LOG.info('Warning message in instance %(id)s console: %(msg)s',
dict(id=server_id, msg=line))
return None
def _poll_for_status(nova_client, server_id, final_ok_states, poll_period=20,
status_field="status"):
"""
Poll for status
"""
LOG.debug('Poll instance %(id)s, waiting for any of statuses %(statuses)s',
dict(id=server_id, statuses=final_ok_states))
while True:
obj = nova_client.servers.get(server_id)
err_msg = check_server_console(nova_client, server_id)
if err_msg:
raise Exception('Critical error in instance %s console: %s' %
(server_id, err_msg))
status = getattr(obj, status_field)
if status:
status = status.lower()
LOG.debug('Instance %(id)s has status %(status)s',
dict(id=server_id, status=status))
if status in final_ok_states:
break
if status in ('error', 'paused'):
raise Exception(obj.fault['message'])
time.sleep(poll_period)
def wait_server_shutdown(nova_client, server_id):
"""
Wait server shutdown
"""
_poll_for_status(nova_client, server_id, ['shutoff'])
def wait_server_snapshot(nova_client, server_id):
"""
Wait server snapshot
"""
task_state_field = "OS-EXT-STS:task_state"
server = nova_client.servers.get(server_id)
if hasattr(server, task_state_field):
_poll_for_status(nova_client, server.id, [None, '-', ''],
status_field=task_state_field)
def get_flavor(nova_client, flavor_name):
"""
Get the flavor
"""
for flavor in nova_client.flavors.list():
if flavor.name == flavor_name:
return flavor
return None
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