def on_put(self, req, resp, name):
"""
Handles PUT requests for Cluster hosts.
This replaces the entire host list for 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 being requested.
:type name: str
"""
try:
req_body = json.loads(req.stream.read().decode())
old_hosts = set(req_body['old']) # Ensures no duplicates
new_hosts = set(req_body['new']) # Ensures no duplicates
except (KeyError, TypeError):
self.logger.info(
'Bad client PUT request for cluster {0}: {1}'.
format(name, req_body))
resp.status = falcon.HTTP_400
return
cluster = util.get_cluster_model(name)
if not cluster:
resp.status = falcon.HTTP_404
return
# old_hosts must match current hosts to accept new_hosts.
# Note: Order doesn't matter, so etcd's atomic comparison
# of the raw values would be too strict.
if old_hosts != set(cluster.hostset):
self.logger.info(
'Conflict setting hosts for cluster {0}'.format(name))
resp.status = falcon.HTTP_409
return
# FIXME: Need input validation. For each new host,
# - Does the host exist at /commissaire/hosts/{IP}?
# - Does the host already belong to another cluster?
# FIXME: Should guard against races here, since we're fetching
# the cluster record and writing it back with some parts
# unmodified. Use either locking or a conditional write
# with the etcd 'modifiedIndex'. Deferring for now.
cluster.hostset = list(new_hosts)
cherrypy.engine.publish(
'store-save', cluster.etcd.key, cluster.to_json(secure=True))
resp.status = falcon.HTTP_200
def on_put(self, req, resp, name):
"""
Handles PUT requests for Cluster hosts.
This replaces the entire host list for 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 being requested.
:type name: str
"""
try:
req_body = json.loads(req.stream.read().decode())
old_hosts = set(req_body['old']) # Ensures no duplicates
new_hosts = set(req_body['new']) # Ensures no duplicates
except (KeyError, TypeError):
self.logger.info(
'Bad client PUT request for cluster {0}: {1}'.format(
name, req_body))
resp.status = falcon.HTTP_400
return
cluster = util.get_cluster_model(name)
if not cluster:
resp.status = falcon.HTTP_404
return
# old_hosts must match current hosts to accept new_hosts.
# Note: Order doesn't matter, so etcd's atomic comparison
# of the raw values would be too strict.
if old_hosts != set(cluster.hostset):
self.logger.info(
'Conflict setting hosts for cluster {0}'.format(name))
resp.status = falcon.HTTP_409
return
# FIXME: Need input validation. For each new host,
# - Does the host exist at /commissaire/hosts/{IP}?
# - Does the host already belong to another cluster?
# FIXME: Should guard against races here, since we're fetching
# the cluster record and writing it back with some parts
# unmodified. Use either locking or a conditional write
# with the etcd 'modifiedIndex'. Deferring for now.
cluster.hostset = list(new_hosts)
cherrypy.engine.publish('store-save', cluster.etcd.key,
cluster.to_json(secure=True))
resp.status = falcon.HTTP_200
def on_get(self, req, resp, name):
"""
Handles GET requests for Cluster hosts.
: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 requested.
:type name: str
"""
cluster = util.get_cluster_model(self.store, name)
if not cluster:
resp.status = falcon.HTTP_404
return
resp.body = json.dumps(cluster.hostset)
resp.status = falcon.HTTP_200
def on_get(self, req, resp, name):
"""
Handles GET requests for Cluster hosts.
: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 requested.
:type name: str
"""
cluster = util.get_cluster_model(name)
if not cluster:
resp.status = falcon.HTTP_404
return
resp.body = json.dumps(cluster.hostset)
resp.status = falcon.HTTP_200
def on_get(self, req, resp, name):
"""
Handles retrieval of an existing 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 being requested.
:type name: str
"""
cluster = util.get_cluster_model(self.store, name)
if not cluster:
resp.status = falcon.HTTP_404
return
self._calculate_hosts(cluster)
# Have to set resp.body explicitly to include Hosts.
resp.body = cluster.to_json_with_hosts()
resp.status = falcon.HTTP_200
def on_get(self, req, resp, name):
"""
Handles retrieval of an existing 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 being requested.
:type name: str
"""
cluster = util.get_cluster_model(self.store, name)
if not cluster:
resp.status = falcon.HTTP_404
return
self._calculate_hosts(cluster)
# Have to set resp.body explicitly to include Hosts.
resp.body = cluster.to_json_with_hosts()
resp.status = falcon.HTTP_200
def on_get(self, req, resp, name, address):
"""
Handles GET requests for individual hosts in a Cluster.
This is a membership test, returning 200 OK if the host
address is part of the cluster, or else 404 Not Found.
: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 requested.
:type name: str
:param address: The address of the Host being requested.
:type address: str
"""
cluster = util.get_cluster_model(self.store, name)
if not cluster:
resp.status = falcon.HTTP_404
return
if address in cluster.hostset:
resp.status = falcon.HTTP_200
else:
resp.status = falcon.HTTP_404
def on_get(self, req, resp, name, address):
"""
Handles GET requests for individual hosts in a Cluster.
This is a membership test, returning 200 OK if the host
address is part of the cluster, or else 404 Not Found.
: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 requested.
:type name: str
:param address: The address of the Host being requested.
:type address: str
"""
cluster = util.get_cluster_model(name)
if not cluster:
resp.status = falcon.HTTP_404
return
if address in cluster.hostset:
resp.status = falcon.HTTP_200
else:
resp.status = falcon.HTTP_404