def on_put(self, req, resp, address):
"""
Handles the creation of a new Host.
: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 address: The address of the Host being requested.
:type address: str
"""
# TODO: Verify input
try:
host = self.store.get("/commissaire/hosts/{0}".format(address))
resp.status = falcon.HTTP_409
return
except etcd.EtcdKeyNotFound:
pass
data = req.stream.read().decode()
host_creation = json.loads(data)
ssh_priv_key = host_creation["ssh_priv_key"]
host_creation["address"] = address
host_creation["os"] = ""
host_creation["status"] = "investigating"
host_creation["cpus"] = -1
host_creation["memory"] = -1
host_creation["space"] = -1
host_creation["last_check"] = None
# Don't store the cluster name in etcd.
cluster_name = host_creation.pop("cluster", None)
# Verify the cluster exists, if given. Do it now
# so we can fail before writing anything to etcd.
if cluster_name:
# XXX: Based on ClusterSingleHostResource.on_put().
# Add a util module to share common operations.
cluster_key = "/commissaire/clusters/{0}".format(cluster_name)
try:
etcd_resp = self.store.get(cluster_key)
self.logger.info("Request for cluster {0}".format(cluster_name))
self.logger.debug("{0}".format(etcd_resp))
except etcd.EtcdKeyNotFound:
self.logger.info("Request for non-existent cluster {0}.".format(cluster_name))
resp.status = falcon.HTTP_409
return
cluster = Cluster(**json.loads(etcd_resp.value))
hostset = set(cluster.hostset)
hostset.add(address) # Ensures no duplicates
cluster.hostset = list(hostset)
host = Host(**host_creation)
new_host = self.store.set("/commissaire/hosts/{0}".format(address), host.to_json(secure=True))
INVESTIGATE_QUEUE.put((host_creation, ssh_priv_key))
# Add host to the requested cluster.
if cluster_name:
# 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.
self.store.set(cluster_key, cluster.to_json(secure=True))
resp.status = falcon.HTTP_201
req.context["model"] = Host(**json.loads(new_host.value))
