def _create_resource_class(self, name):
"""Calls the placement API to create a new resource class.
:param name: String name of the resource class to create.
:returns: None on successful creation.
:raises: `exception.InvalidResourceClass` upon error.
"""
url = "/resource_classes"
payload = {
'name': name,
}
resp = self.post(url, payload, version="1.2")
if 200 <= resp.status_code < 300:
msg = ("Created resource class record via placement API "
"for resource class %s.")
LOG.info(msg, name)
elif resp.status_code == 409:
# Another thread concurrently created a resource class with the
# same name. Log a warning and then just return
msg = ("Another thread already created a resource class "
"with the name %s. Returning.")
LOG.info(msg, name)
else:
msg = ("Failed to create resource class %(resource_class)s in "
"placement API. Got %(status_code)d: %(err_text)s.")
args = {
'resource_class': name,
'status_code': resp.status_code,
'err_text': resp.text,
}
LOG.error(msg, args)
raise exception.InvalidResourceClass(resource_class=name)
def _ensure_resource_class(self, name):
"""Make sure a custom resource class exists.
First attempt to PUT the resource class using microversion 1.7. If
this results in a 406, fail over to a GET and POST with version 1.2.
Returns the name of the resource class if it was successfully
created or already exists. Otherwise None.
:param name: String name of the resource class to check/create.
:raises: `exception.InvalidResourceClass` upon error.
"""
# no payload on the put request
response = self.put("/resource_classes/%s" % name, None, version="1.7")
if 200 <= response.status_code < 300:
return name
elif response.status_code == 406:
# microversion 1.7 not available so try the earlier way
# TODO(cdent): When we're happy that all placement
# servers support microversion 1.7 we can remove this
# call and the associated code.
LOG.debug('Falling back to placement API microversion 1.2 '
'for resource class management.')
return self._get_or_create_resource_class(name)
else:
msg = ("Failed to ensure resource class record with "
"placement API for resource class %(rc_name)s. "
"Got %(status_code)d: %(err_text)s.")
args = {
'rc_name': name,
'status_code': response.status_code,
'err_text': response.text,
}
LOG.error(msg, args)
raise exception.InvalidResourceClass(resource_class=name)