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# ============LICENSE_START=======================================================
# org.onap.dcae
# ================================================================================
# Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ============LICENSE_END=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
from urlparse import urlparse
import json
import consul
class DiscoveryError(RuntimeError):
pass
def _create_rel_key(service_component_name):
return "{0}:rel".format(service_component_name)
def _parse_host(host):
"""Parse host string
Returns:
Tuple of the hostname and port to use to connect to Consul
"""
def parse_urlparse_result(pr):
if not pr.hostname:
raise DiscoveryError("Invalid Consul host provided: {0}".format(host))
try:
# Port 8500 is the Consul default
return (pr.hostname, pr.port if pr.port else 8500)
except ValueError as e:
# Something bad happened with port
raise DiscoveryError("Invalid Consul host provided: {0}".format(host))
pr = urlparse(host)
# urlparse requires scheme to be set in order to be useful
if pr.scheme and pr.netloc:
return parse_urlparse_result(pr)
else:
return parse_urlparse_result(urlparse("http://{0}".format(host)))
def create_kv_conn(host):
"""Create connection to key-value store
Returns a Consul client to the specified Consul host
"""
(hostname, port) = _parse_host(host)
return consul.Consul(host=hostname, port=port)
def store_relationship(kv_conn, source_name, target_name):
# TODO: Rel entry may already exist in a one-to-many situation. Need to
# support that.
rel_key = _create_rel_key(source_name)
rel_value = [target_name] if target_name else []
kv_conn.kv.put(rel_key, json.dumps(rel_value))
print("Added relationship for {0}".format(rel_key))
def delete_relationship(kv_conn, service_component_name):
rel_key = _create_rel_key(service_component_name)
index, rels = kv_conn.kv.get(rel_key)
if rels:
rels = json.loads(rels["Value"].decode("utf-8"))
kv_conn.kv.delete(rel_key)
return rels
else:
return []
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