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# ================================================================================
# Copyright (c) 2017-2018 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.
"""client to talk to consul at the standard port 8500"""
import logging
import json
import base64
import requests
class DiscoveryClient(object):
"""talking to consul at http://consul:8500
relies on proper --add-host "consul:<consul-agent ip>" in
docker run command that runs along the consul-agent:
docker run --name ${APPNAME} -d
-e HOSTNAME
--add-host "consul:<consul-agent ip>"
-v ${BASEDIR}/logs:${TARGETDIR}/logs
-v ${BASEDIR}/etc:${TARGETDIR}/etc
-p <outport>:<innerport>
${APPNAME}:latest
"""
CONSUL_SERVICE_MASK = "http://consul:8500/v1/catalog/service/{0}"
CONSUL_KV_MASK = "http://consul:8500/v1/kv/{0}"
SERVICE_MASK = "http://{0}:{1}"
SERVICE_ADDRESS = "ServiceAddress"
SERVICE_PORT = "ServicePort"
_logger = logging.getLogger("policy_handler.discovery")
@staticmethod
def get_service_url(service_name):
"""find the service record in consul"""
service_path = DiscoveryClient.CONSUL_SERVICE_MASK.format(service_name)
DiscoveryClient._logger.info("discover %s", service_path)
response = requests.get(service_path)
response.raise_for_status()
service = response.json()
if not service:
DiscoveryClient._logger.error("failed discover %s", service_path)
return
service = service[0]
return DiscoveryClient.SERVICE_MASK.format(
service[DiscoveryClient.SERVICE_ADDRESS], service[DiscoveryClient.SERVICE_PORT]
)
@staticmethod
def get_value(key):
"""get the value for the key from consul-kv"""
response = requests.get(DiscoveryClient.CONSUL_KV_MASK.format(key))
response.raise_for_status()
data = response.json()
if not data:
DiscoveryClient._logger.error("failed get_value %s", key)
return
value = base64.b64decode(data[0]["Value"]).decode("utf-8")
DiscoveryClient._logger.info("consul-kv key=%s value(%s) data=%s",
key, value, json.dumps(data))
return json.loads(value)
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