def on_get(self, req, resp, name):
"""
Handles GET (or "status") requests for a tree image deployment
across a Cluster.
: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 undergoing deployment.
:type name: str
"""
if not util.etcd_cluster_exists(name):
self.logger.info(
'Upgrade GET requested for nonexistent cluster {0}'.format(
name))
resp.status = falcon.HTTP_404
return
try:
cluster_deploy = ClusterDeploy.retrieve(name)
self.logger.debug('Found ClusterDeploy for {0}'.format(name))
except:
# Return "204 No Content" if we have no status,
# meaning no upgrade is in progress. The client
# can't be expected to know that, so it's not a
# client error (4xx).
self.logger.debug((
'Upgrade GET requested for {0} but no upgrade '
'has ever been executed.').format(name))
resp.status = falcon.HTTP_204
return
resp.status = falcon.HTTP_200
req.context['model'] = cluster_deploy
def on_put(self, req, resp, name):
"""
Handles PUT (or "initiate") requests for a tree image deployment
across a Cluster.
: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 undergoing deployment.
:type name: str
"""
data = req.stream.read().decode()
try:
args = json.loads(data)
version = args['version']
except (KeyError, ValueError):
resp.status = falcon.HTTP_400
return
# Make sure the cluster name is valid.
if not util.etcd_cluster_exists(name):
self.logger.info(
'Upgrade PUT requested for nonexistent cluster {0}'.format(
name))
resp.status = falcon.HTTP_404
return
# If the operation is already in progress and the requested version
# matches, return the current status with response code 200 OK.
# If the requested version conflicts with the operation in progress,
# return the current status with response code 409 Conflict.
try:
cluster_deploy = ClusterDeploy.retrieve(name)
self.logger.debug('Found ClusterDeploy for {0}'.format(name))
if not cluster_deploy.finished_at:
if cluster_deploy.version == version:
self.logger.debug(
'Cluster {0} deployment to {1} already in progress'.
format(name, version))
resp.status = falcon.HTTP_200
else:
self.logger.debug(
'Cluster deployment to {0} requested while '
'upgrade to {1} was already in progress'.
format(version, cluster_deploy.version))
resp.status = falcon.HTTP_409
req.context['model'] = cluster_deploy
return
except:
pass
p = Process(target=clusterexec,
args=(name, 'upgrade', {'version': version}))
p.start()
self.logger.debug('Started upgrade in clusterexecpool for {0}'.format(
name))
cluster_deploy_default = {
'status': 'in_process',
'version': version,
'deployed': [],
'in_process': [],
'started_at': datetime.datetime.utcnow().isoformat(),
'finished_at': None
}
cluster_deploy = ClusterDeploy(**cluster_deploy_default)
cluster_deploy.save(name)
resp.status = falcon.HTTP_201
req.context['model'] = cluster_deploy
