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# ================================================================================
# Copyright (c) 2017-2020 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=========================================================
#
"""client to talk to consul on standard port 8500"""
import base64
import json
import requests
from cloudify import ctx
from cloudify.exceptions import NonRecoverableError
# it is safe to assume that consul agent is at consul:8500
# define consul alis in /etc/hosts on cloudify manager vm
# $ cat /etc/hosts
# 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 consul
CONSUL_SERVICE_URL = "http://consul:8500/v1/catalog/service/{0}"
CONSUL_KV_MASK = "http://consul:8500/v1/kv/{0}"
def discover_service_url(service_name):
"""find the service record in consul"""
service_url = CONSUL_SERVICE_URL.format(service_name)
ctx.logger.info("getting service_url at {0}".format(service_url))
try:
response = requests.get(service_url, timeout=60)
except requests.ConnectionError as ex:
raise NonRecoverableError(
"ConnectionError - failed to get {0}: {1}".format(service_url, str(ex)))
ctx.logger.info("got {0} for service_url at {1} response: {2}"
.format(response.status_code, service_url, response.text))
if response.status_code != requests.codes.ok:
return
resp_json = response.json()
if resp_json:
service = resp_json[0]
return "http://{0}:{1}".format(service["ServiceAddress"], service["ServicePort"])
def discover_value(key):
"""get the value for the key from consul-kv"""
kv_url = CONSUL_KV_MASK.format(key)
ctx.logger.info("getting kv at {0}".format(kv_url))
try:
response = requests.get(kv_url, timeout=60)
except requests.ConnectionError as ex:
raise NonRecoverableError(
"ConnectionError - failed to get {0}: {1}".format(kv_url, str(ex)))
ctx.logger.info("got {0} for kv at {1} response: {2}"
.format(response.status_code, kv_url, response.text))
if response.status_code != requests.codes.ok:
return
data = response.json()
if not data:
ctx.logger.error("failed discover_value %s", key)
return
value = base64.b64decode(data[0]["Value"]).decode("utf-8")
ctx.logger.info("consul-kv key=%s value(%s) data=%s",
key, value, json.dumps(data))
return json.loads(value)
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