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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 services and kv"""
import base64
import json
import logging
import requests
from .config import Config
from .customize import CustomizerUser
from .onap.audit import AuditHttpCode, Metrics
class DiscoveryClient(object):
"""talking to consul at Config.consul_url
Config.consul_url is populated
from env var $CONSUL_URL
if not provided, then from consul_url in etc/config.json
if not provided, then from hardcoded value of 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 -e CONSUL_URL
--add-host "consul:<consul-agent ip>"
-v ${BASEDIR}/logs:${TARGETDIR}/logs
-v ${BASEDIR}/etc:${TARGETDIR}/etc
-p <outport>:<innerport>
${APPNAME}:latest
"""
CONSUL_ENTITY = "consul"
CONSUL_SERVICE_MASK = "{}/v1/catalog/service/{}"
CONSUL_KV_MASK = "{}/v1/kv/{}"
_logger = logging.getLogger("policy_handler.discovery")
@staticmethod
def _discover_service(audit, service_name, service_path):
"""find the service record in consul"""
response = requests.get(service_path, timeout=Config.consul_timeout_in_secs)
DiscoveryClient._logger.info(audit.info("response {} from {}: {}".format(
response.status_code, service_path, response.text)))
response.raise_for_status()
status_code = response.status_code
service = response.json()[0]
return (status_code,
CustomizerUser.get_customizer().get_service_url(audit, service_name, service))
@staticmethod
def get_service_url(audit, service_name):
"""find the service record in consul"""
service_path = DiscoveryClient.CONSUL_SERVICE_MASK.format(Config.consul_url, service_name)
metrics = Metrics(aud_parent=audit, targetEntity=DiscoveryClient.CONSUL_ENTITY,
targetServiceName=service_path)
log_line = "get from {} at {}".format(DiscoveryClient.CONSUL_ENTITY, service_path)
DiscoveryClient._logger.info(metrics.metrics_start(log_line))
status_code = None
try:
(status_code,
service_url) = DiscoveryClient._discover_service(audit, service_name, service_path)
except Exception as ex:
error_code = (AuditHttpCode.SERVICE_UNAVAILABLE_ERROR.value
if isinstance(ex, requests.exceptions.RequestException)
else AuditHttpCode.SERVER_INTERNAL_ERROR.value)
error_msg = ("failed {}/{} to {} {}: {}".format(status_code, error_code, log_line,
type(ex).__name__, str(ex)))
DiscoveryClient._logger.exception(error_msg)
metrics.set_http_status_code(error_code)
audit.set_http_status_code(error_code)
metrics.metrics(error_msg)
return None
if not service_url:
error_code = AuditHttpCode.DATA_ERROR.value
error_msg = "failed {}/{} to {}".format(status_code, error_code, log_line)
DiscoveryClient._logger.error(audit.error(error_msg))
metrics.set_http_status_code(error_code)
audit.set_http_status_code(error_code)
metrics.metrics(error_msg)
return None
log_line = "response {} {}".format(status_code, log_line)
DiscoveryClient._logger.info(audit.info("got service_url: {} after {}"
.format(service_url, log_line)))
metrics.set_http_status_code(status_code)
audit.set_http_status_code(status_code)
metrics.metrics(log_line)
return service_url
@staticmethod
def _get_value_from_kv(url):
"""get the value from consul-kv at discovery url"""
response = requests.get(url, timeout=Config.consul_timeout_in_secs)
response.raise_for_status()
data = response.json()
value = base64.b64decode(data[0]["Value"]).decode("utf-8")
return response.status_code, json.loads(value)
@staticmethod
def get_value(audit, key):
"""get the value for the key from consul-kv"""
discovery_url = DiscoveryClient.CONSUL_KV_MASK.format(Config.consul_url, key)
metrics = Metrics(aud_parent=audit, targetEntity=DiscoveryClient.CONSUL_ENTITY,
targetServiceName=discovery_url)
log_line = "get from {} at {}".format(DiscoveryClient.CONSUL_ENTITY, discovery_url)
DiscoveryClient._logger.info(metrics.metrics_start(log_line))
status_code = None
try:
status_code, value = DiscoveryClient._get_value_from_kv(discovery_url)
except Exception as ex:
error_code = (AuditHttpCode.SERVICE_UNAVAILABLE_ERROR.value
if isinstance(ex, requests.exceptions.RequestException)
else AuditHttpCode.SERVER_INTERNAL_ERROR.value)
error_msg = ("failed {}/{} to {} {}: {}".format(status_code, error_code, log_line,
type(ex).__name__, str(ex)))
DiscoveryClient._logger.exception(error_msg)
metrics.set_http_status_code(error_code)
audit.set_http_status_code(error_code)
metrics.metrics(error_msg)
return None
log_line = "response {} {}".format(status_code, log_line)
metrics.set_http_status_code(status_code)
audit.set_http_status_code(status_code)
metrics.metrics(log_line)
return value
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