8577096e19
Raise BrickException instead of Exception for errors here. This makes it easier for callers to handle failures correctly. Change-Id: I8e433ad5d11873b39f578c98278e5d3b34cf7012
120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
# 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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import os
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from oslo_concurrency import processutils as putils
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from oslo_log import log as logging
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from os_brick import caches
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from os_brick import exception
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from os_brick import executor
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LOG = logging.getLogger(__name__)
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class OpenCASEngine(executor.Executor, caches.CacheEngineBase):
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def __init__(self, **kwargs):
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super(OpenCASEngine, self).__init__(**kwargs)
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self.cache_id = kwargs.get('opencas_cache_id')
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def os_execute(self, *cmd, **kwargs):
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LOG.debug('os_execute: cmd: %s, args: %s', cmd, kwargs)
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try:
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out, err = self._execute(*cmd, **kwargs)
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except putils.ProcessExecutionError as err:
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LOG.exception('os_execute error')
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LOG.error('Cmd :%s', err.cmd)
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LOG.error('StdOut :%s', err.stdout)
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LOG.error('StdErr :%s', err.stderr)
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raise
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return out, err
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def is_engine_ready(self, **kwargs):
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"""'casadm -L' will print like:
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type id disk status write policy device
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cache 1 /dev/nvme0n1 Running wt -
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"""
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cmd = ['casadm', '-L']
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kwargs = dict(run_as_root=True,
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root_helper=self._root_helper)
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out, err = self.os_execute(*cmd, **kwargs)
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for line in out.splitlines():
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fields = line.split()
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if str(self.cache_id) == fields[1] and 'Running' == fields[3]:
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return True
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return False
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def attach_volume(self, **kwargs):
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core = kwargs.get('dev_path')
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if core is None:
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LOG.error('dev_path is not specified')
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raise exception.VolumePathsNotFound()
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core = os.path.realpath(core)
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return self._map_casdisk(core)
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def detach_volume(self, **kwargs):
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casdev = kwargs.get('dev_path')
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if casdev is None:
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LOG.error('dev_path is not specified')
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raise exception.VolumePathsNotFound()
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coreid, coredev = self._get_mapped_coredev(casdev)
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LOG.info("opencas: coreid=%s,coredev=%s", coreid, coredev)
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self._unmap_casdisk(coreid)
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return coredev
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def _get_mapped_casdev(self, core):
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cmd = ['casadm', '-L']
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kwargs = dict(run_as_root=True,
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root_helper=self._root_helper)
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out, err = self.os_execute(*cmd, **kwargs)
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for line in out.splitlines():
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if line.find(core) < 0:
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continue
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fields = line.split()
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return fields[5]
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raise exception.BrickException('Cannot find emulated device.')
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def _get_mapped_coredev(self, casdev):
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cmd = ['casadm', '-L']
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kwargs = dict(run_as_root=True,
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root_helper=self._root_helper)
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out, err = self.os_execute(*cmd, **kwargs)
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for line in out.splitlines():
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if line.find(casdev) < 0:
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continue
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fields = line.split()
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return (fields[1], fields[2])
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raise exception.BrickException('Cannot find core device.')
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def _map_casdisk(self, core):
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cmd = ['casadm', '-A', '-i', self.cache_id, '-d', core]
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kwargs = dict(run_as_root=True,
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root_helper=self._root_helper)
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out, err = self.os_execute(*cmd, **kwargs)
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return self._get_mapped_casdev(core)
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def _unmap_casdisk(self, coreid):
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cmd = ['casadm', '-R', '-f', '-i', self.cache_id, '-j', coreid]
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kwargs = dict(run_as_root=True,
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root_helper=self._root_helper)
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out, err = self.os_execute(*cmd, **kwargs)
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