def remove_from_compute(self, context, volume, instance_id, host):
"""Remove volume from specified compute host."""
rpc.call(context,
self.db.queue_get_for(context, FLAGS.compute_topic, host),
{"method": "remove_volume_connection",
"args": {'instance_id': instance_id,
'volume_id': volume['id']}})
def mounted_on_same_shared_storage(self, context, instance_ref, dest):
"""Check if the src and dest host mount same shared storage.
At first, dest host creates temp file, and src host can see
it if they mounts same shared storage. Then src host erase it.
:param context: security context
:param instance_ref: cinder.db.sqlalchemy.models.Instance object
:param dest: destination host
"""
src = instance_ref['host']
dst_t = db.queue_get_for(context, FLAGS.compute_topic, dest)
src_t = db.queue_get_for(context, FLAGS.compute_topic, src)
filename = rpc.call(context, dst_t,
{"method": 'create_shared_storage_test_file'})
try:
# make sure existence at src host.
ret = rpc.call(context, src_t,
{"method": 'check_shared_storage_test_file',
"args": {'filename': filename}})
finally:
rpc.cast(context, dst_t,
{"method": 'cleanup_shared_storage_test_file',
"args": {'filename': filename}})
return ret
def initialize_connection(self, context, volume, connector):
host = volume['host']
queue = self.db.queue_get_for(context, FLAGS.volume_topic, host)
return rpc.call(context, queue,
{"method": "initialize_connection",
"args": {"volume_id": volume['id'],
"connector": connector}})
def terminate_connection(self, context, volume, connector):
self.unreserve_volume(context, volume)
host = volume['host']
queue = self.db.queue_get_for(context, FLAGS.volume_topic, host)
return rpc.call(context, queue,
{"method": "terminate_connection",
"args": {"volume_id": volume['id'],
"connector": connector}})
def attach(self, context, volume, instance_id, mountpoint):
host = volume['host']
queue = self.db.queue_get_for(context, FLAGS.volume_topic, host)
return rpc.call(context, queue,
{"method": "attach_volume",
"args": {"volume_id": volume['id'],
"instance_id": instance_id,
"mountpoint": mountpoint}})
def _call_scheduler(method, context, params=None):
"""Generic handler for RPC calls to the scheduler.
:param params: Optional dictionary of arguments to be passed to the
scheduler worker
:retval: Result returned by scheduler worker
"""
if not params:
params = {}
queue = FLAGS.scheduler_topic
kwargs = {'method': method, 'args': params}
return rpc.call(context, queue, kwargs)
def detach(self, context, volume):
host = volume['host']
queue = self.db.queue_get_for(context, FLAGS.volume_topic, host)
return rpc.call(context, queue,
{"method": "detach_volume",
"args": {"volume_id": volume['id']}})
