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# ================================================================================
# Copyright (c) 2019 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=========================================================
#
"""policy-client communicates with policy-engine thru REST API"""
import copy
import json
from threading import Lock
import requests
from ..config import Config, Settings
from ..onap.audit import AuditHttpCode, AuditResponseCode, Metrics
from ..utils import Utils
_LOGGER = Utils.get_logger(__file__)
class DmaapMr(object):
"""using the http API to policy-engine"""
_lazy_inited = False
DEFAULT_TIMEOUT_IN_SECS = 60
_lock = Lock()
_settings = Settings(Config.DMAAP_MR)
_requests_session = None
_long_polling = False
_target_entity = None
_url = None
_query = {}
_headers = None
_custom_kwargs = {}
_timeout_in_secs = DEFAULT_TIMEOUT_IN_SECS
@staticmethod
def _init(audit):
"""init static config"""
DmaapMr._custom_kwargs = {}
tls_ca_mode = None
if not DmaapMr._requests_session:
DmaapMr._requests_session = requests.Session()
DmaapMr._requests_session.mount(
'https://', requests.adapters.HTTPAdapter(pool_connections=1, pool_maxsize=1,
pool_block=True))
DmaapMr._requests_session.mount(
'http://', requests.adapters.HTTPAdapter(pool_connections=1, pool_maxsize=1,
pool_block=True))
_, config = DmaapMr._settings.get_by_key(Config.DMAAP_MR)
if config:
DmaapMr._url = config.get("url")
DmaapMr._headers = config.get("headers", {})
DmaapMr._query = copy.deepcopy(config.get("query", {}))
if DmaapMr._query.get(Config.QUERY_TIMEOUT, 0) < 1000:
DmaapMr._query[Config.QUERY_TIMEOUT] = 15000
DmaapMr._target_entity = config.get("target_entity", Config.DMAAP_MR)
tls_ca_mode = config.get(Config.TLS_CA_MODE)
DmaapMr._custom_kwargs = Config.get_requests_kwargs(tls_ca_mode)
DmaapMr._timeout_in_secs = config.get(Config.TIMEOUT_IN_SECS)
if not DmaapMr._timeout_in_secs or DmaapMr._timeout_in_secs < 1:
DmaapMr._timeout_in_secs = DmaapMr.DEFAULT_TIMEOUT_IN_SECS
_LOGGER.info(
audit.info(("config DMaaP MR({}) url({}) query({}) headers({}) "
"tls_ca_mode({}) custom_kwargs({}) timeout_in_secs({}): {}").format(
DmaapMr._target_entity, DmaapMr._url,
Metrics.json_dumps(DmaapMr._query),
Metrics.json_dumps(DmaapMr._headers), tls_ca_mode,
json.dumps(DmaapMr._custom_kwargs), DmaapMr._timeout_in_secs,
DmaapMr._settings)))
DmaapMr._settings.commit_change()
DmaapMr._lazy_inited = True
@staticmethod
def reconfigure(audit):
"""reconfigure"""
with DmaapMr._lock:
DmaapMr._settings.set_config(Config.discovered_config)
if not DmaapMr._settings.is_changed():
DmaapMr._settings.commit_change()
return False
DmaapMr._lazy_inited = False
DmaapMr._long_polling = False
DmaapMr._init(audit)
return True
@staticmethod
def _lazy_init(audit):
"""init static config"""
if DmaapMr._lazy_inited:
return
with DmaapMr._lock:
if DmaapMr._lazy_inited:
return
DmaapMr._settings.set_config(Config.discovered_config)
DmaapMr._long_polling = False
DmaapMr._init(audit)
@staticmethod
def get_policy_updates(audit):
"""
get from DMaaP MR - returns json list of stringified messages
example [
"{\"deployed-policies\":[
{\"policy-type\":\"onap.policies.monitoring.cdap.tca.hi.lo.app\",
\"policy-type-version\":\"1.0.0\",
\"policy-id\":\"onap.scaleout.tca\",
\"policy-version\":\"2.2.2\",
\"success-count\":3,
\"failure-count\":0
}],
\"undeployed-policies\":[
{\"policy-type\":\"onap.policies.monitoring.cdap.tca.hi.lo.app\",
\"policy-type-version\":\"1.0.0\",
\"policy-id\":\"onap.scaleout.tca\",
\"policy-version\":\"1.0.0\",
\"success-count\":3,
\"failure-count\":0
}]}"
]
"""
DmaapMr._lazy_init(audit)
if not DmaapMr._url:
_LOGGER.error(
audit.error("no url for DMaaP MR", error_code=AuditResponseCode.AVAILABILITY_ERROR))
audit.set_http_status_code(AuditHttpCode.SERVER_INTERNAL_ERROR.value)
return None
with DmaapMr._lock:
target_entity = DmaapMr._target_entity
url = DmaapMr._url
params = copy.deepcopy(DmaapMr._query) if DmaapMr._long_polling else None
headers = copy.deepcopy(DmaapMr._headers)
timeout_in_secs = DmaapMr._timeout_in_secs
custom_kwargs = copy.deepcopy(DmaapMr._custom_kwargs)
DmaapMr._long_polling = True
metrics = Metrics(aud_parent=audit, targetEntity=target_entity, targetServiceName=url)
headers = metrics.put_request_id_into_headers(headers)
log_line = (
"get from {} at {} with params={}, headers={}, custom_kwargs({}) timeout_in_secs({})"
.format(target_entity, url, json.dumps(params), Metrics.json_dumps(headers),
json.dumps(custom_kwargs), timeout_in_secs))
_LOGGER.info(metrics.metrics_start(log_line))
res = None
try:
res = DmaapMr._requests_session.get(url, params=params, headers=headers,
timeout=timeout_in_secs, **custom_kwargs)
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(type(ex).__name__, str(ex), log_line))
_LOGGER.exception(metrics.fatal(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 {} from {}: text={} headers={}".format(
res.status_code, log_line, res.text, Metrics.json_dumps(dict(res.headers.items())))
_LOGGER.info(log_line)
metrics.set_http_status_code(res.status_code)
audit.set_http_status_code(res.status_code)
metrics.metrics(log_line)
policy_updates = None
if res.status_code == requests.codes.ok:
policy_updates = res.json()
return policy_updates
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