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# 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.
import os
from oslo_concurrency import processutils as putils
from oslo_log import log as logging
from os_brick import caches
from os_brick import exception
from os_brick import executor
LOG = logging.getLogger(__name__)
class OpenCASEngine(executor.Executor, caches.CacheEngineBase):
def __init__(self, **kwargs):
super(OpenCASEngine, self).__init__(**kwargs)
self.cache_id = kwargs.get('opencas_cache_id')
def os_execute(self, *cmd, **kwargs):
LOG.debug('os_execute: cmd: %s, args: %s', cmd, kwargs)
try:
out, err = self._execute(*cmd, **kwargs)
except putils.ProcessExecutionError as err:
LOG.exception('os_execute error')
LOG.error('Cmd :%s', err.cmd)
LOG.error('StdOut :%s', err.stdout)
LOG.error('StdErr :%s', err.stderr)
raise
return out, err
def is_engine_ready(self, **kwargs):
"""'casadm -L' will print like:
type id disk status write policy device
cache 1 /dev/nvme0n1 Running wt -
"""
cmd = ['casadm', '-L']
kwargs = dict(run_as_root=True,
root_helper=self._root_helper)
out, err = self.os_execute(*cmd, **kwargs)
for line in out.splitlines():
fields = line.split()
if str(self.cache_id) == fields[1] and 'Running' == fields[3]:
return True
return False
def attach_volume(self, **kwargs):
core = kwargs.get('dev_path')
if core is None:
LOG.error('dev_path is not specified')
raise exception.VolumePathsNotFound()
core = os.path.realpath(core)
return self._map_casdisk(core)
def detach_volume(self, **kwargs):
casdev = kwargs.get('dev_path')
if casdev is None:
LOG.error('dev_path is not specified')
raise exception.VolumePathsNotFound()
coreid, coredev = self._get_mapped_coredev(casdev)
LOG.info("opencas: coreid=%s,coredev=%s", coreid, coredev)
self._unmap_casdisk(coreid)
return coredev
def _get_mapped_casdev(self, core):
cmd = ['casadm', '-L']
kwargs = dict(run_as_root=True,
root_helper=self._root_helper)
out, err = self.os_execute(*cmd, **kwargs)
for line in out.splitlines():
if line.find(core) < 0:
continue
fields = line.split()
return fields[5]
raise exception.BrickException('Cannot find emulated device.')
def _get_mapped_coredev(self, casdev):
cmd = ['casadm', '-L']
kwargs = dict(run_as_root=True,
root_helper=self._root_helper)
out, err = self.os_execute(*cmd, **kwargs)
for line in out.splitlines():
if line.find(casdev) < 0:
continue
fields = line.split()
return (fields[1], fields[2])
raise exception.BrickException('Cannot find core device.')
def _map_casdisk(self, core):
cmd = ['casadm', '-A', '-i', self.cache_id, '-d', core]
kwargs = dict(run_as_root=True,
root_helper=self._root_helper)
out, err = self.os_execute(*cmd, **kwargs)
return self._get_mapped_casdev(core)
def _unmap_casdisk(self, coreid):
cmd = ['casadm', '-R', '-f', '-i', self.cache_id, '-j', coreid]
kwargs = dict(run_as_root=True,
root_helper=self._root_helper)
out, err = self.os_execute(*cmd, **kwargs)
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