def on_get(self, req, resp, name):
"""
Handles GET (or "status") requests for a Cluster restart.
:param req: Request instance that will be passed through.
:type req: falcon.Request
:param resp: Response instance that will be passed through.
:type resp: falcon.Response
:param name: The name of the Cluster being restarted.
:type name: str
"""
if not util.etcd_cluster_exists(name):
self.logger.info(
'Restart GET requested for nonexistent cluster {0}'.format(
name))
resp.status = falcon.HTTP_404
return
try:
cluster_restart = ClusterRestart.retrieve(name)
except:
# Return "204 No Content" if we have no status,
# meaning no restart is in progress. The client
# can't be expected to know that, so it's not a
# client error (4xx).
self.logger.debug((
'Restart GET requested for {0} but no restart '
'has ever been executed.').format(name))
resp.status = falcon.HTTP_204
return
resp.status = falcon.HTTP_200
req.context['model'] = cluster_restart
def on_put(self, req, resp, name):
"""
Handles PUT (or "initiate") requests for a Cluster restart.
:param req: Request instance that will be passed through.
:type req: falcon.Request
:param resp: Response instance that will be passed through.
:type resp: falcon.Response
:param name: The name of the Cluster being restarted.
:type name: str
"""
# Make sure the cluster name is valid.
if not util.etcd_cluster_exists(name):
self.logger.info(
'Restart PUT requested for nonexistent cluster {0}'.format(
name))
resp.status = falcon.HTTP_404
return
# If the operation is already in progress, return the current
# status with response code 200 OK.
try:
cluster_restart = ClusterRestart.retrieve(name)
self.logger.debug('Found a ClusterRestart for {0}'.format(name))
if not cluster_restart.finished_at:
self.logger.debug(
'Cluster {0} restart already in progress'.format(name))
resp.status = falcon.HTTP_200
req.context['model'] = cluster_restart
return
except:
# This means one doesn't already exist
pass
# TODO: Move to a poll?
p = Process(target=clusterexec, args=(name, 'restart'))
p.start()
self.logger.debug('Started restart in clusterexecpool for {0}'.format(
name))
cluster_restart_default = {
'status': 'in_process',
'restarted': [],
'in_process': [],
'started_at': datetime.datetime.utcnow().isoformat(),
'finished_at': None
}
cluster_restart = ClusterRestart(**cluster_restart_default)
cluster_restart.save(name)
resp.status = falcon.HTTP_201
req.context['model'] = cluster_restart