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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=========================================================
#
"""
ask service_activator for the mode_of_operation
that is whether the current site/cluster is active versus passive
active is the default and expects the polisy-handler
to receive the push notifications from policy-engine
as well as to periodically run the catch_up process
passive expects the polisy-handler
to stop listening for the policy-updates from the policy-engine
and to stop doing the periodic catch_up
"""
import json
from copy import deepcopy
from urllib.parse import urljoin
import requests
from .config import Config, Settings
from .onap.audit import (REQUEST_X_ECOMP_REQUESTID, Audit, AuditHttpCode,
Metrics)
from .policy_consts import TARGET_ENTITY
from .utils import Utils
_LOGGER = Utils.get_logger(__file__)
class ServiceActivator(object):
"""calling the service_activator web api to determine the mode_of_operation"""
DEFAULT_TARGET_ENTITY = "service_activator"
DEFAULT_TIMEOUT_IN_SECS = 10
MODE_OF_OPERATION_ACTIVE = "active"
SERVICE_MODE = "service_mode"
_lazy_inited = False
_settings = Settings(Config.MODE_OF_OPERATION, Config.SERVICE_ACTIVATOR)
_mode_of_operation = None
_url = None
_url_register = None
_post_register = {}
_target_entity = None
_custom_kwargs = {}
_timeout_in_secs = DEFAULT_TIMEOUT_IN_SECS
@staticmethod
def _init(audit):
"""
initialize service-activator client config based on discovered config:
"mode_of_operation" : "active",
"service_activator" : {
"target_entity" : "service_activator",
"url" : "https://service-activator-service:123",
"path_register" : "/register",
"tls_ca_mode" : "cert_directory",
"timeout_in_secs": 20,
"post_register" : {
"component_name" : "policy_handler",
"reconfigure_path" : "/reconfigure",
"http_protocol" : "http"
}
}
"""
ServiceActivator._custom_kwargs = {}
ServiceActivator._url = ServiceActivator._url_register = ""
Audit.register_item_health(ServiceActivator.SERVICE_MODE, ServiceActivator._get_service_mode)
try:
_, ServiceActivator._mode_of_operation = ServiceActivator._settings.get_by_key(
Config.MODE_OF_OPERATION, ServiceActivator._mode_of_operation)
_, config_sa = ServiceActivator._settings.get_by_key(Config.SERVICE_ACTIVATOR)
if config_sa and isinstance(config_sa, dict):
ServiceActivator._target_entity = config_sa.get(
TARGET_ENTITY, ServiceActivator.DEFAULT_TARGET_ENTITY)
ServiceActivator._url = config_sa.get("url", "")
if ServiceActivator._url:
ServiceActivator._url_register = urljoin(ServiceActivator._url,
config_sa.get("path_register", ""))
ServiceActivator._post_register = deepcopy(config_sa.get("post_register", {}))
tls_ca_mode = config_sa.get(Config.TLS_CA_MODE)
ServiceActivator._custom_kwargs = Config.get_requests_kwargs(tls_ca_mode)
_LOGGER.info(audit.info(
"dns based routing to %s: url(%s) tls_ca_mode(%s) custom_kwargs(%s)",
ServiceActivator._target_entity, ServiceActivator._url_register,
tls_ca_mode, json.dumps(ServiceActivator._custom_kwargs)))
ServiceActivator._timeout_in_secs = config_sa.get(Config.TIMEOUT_IN_SECS)
if not ServiceActivator._timeout_in_secs or ServiceActivator._timeout_in_secs < 1:
ServiceActivator._timeout_in_secs = ServiceActivator.DEFAULT_TIMEOUT_IN_SECS
ServiceActivator._settings.commit_change()
except Exception:
pass
ServiceActivator._lazy_inited = True
@staticmethod
def reconfigure(audit):
"""reconfigure"""
ServiceActivator._settings.set_config(Config.discovered_config)
if not ServiceActivator._settings.is_changed():
ServiceActivator._settings.commit_change()
return False
ServiceActivator._lazy_inited = False
ServiceActivator._init(audit)
return True
@staticmethod
def _lazy_init(audit):
"""set config"""
if ServiceActivator._lazy_inited:
return
ServiceActivator._settings.set_config(Config.discovered_config)
ServiceActivator._init(audit)
@staticmethod
def _get_service_mode():
"""returns the service_mode as json to be reported by the healthcheck"""
return {
"is_active_mode_of_operation": ServiceActivator.is_active_mode_of_operation(),
"is_pdp_api_default": Config.is_pdp_api_default(log_status=False)
}
@staticmethod
def is_active_mode_of_operation(audit=None):
"""
mode_of_operation - whether the service is
active == True or passive == False
based on the current value of the mode_of_operation
temporary for R4 Dublin - passive for new PDP API
"""
active = (ServiceActivator._mode_of_operation is None
or ServiceActivator._mode_of_operation
== ServiceActivator.MODE_OF_OPERATION_ACTIVE)
if active and Config.is_pdp_api_default():
active = False
if audit:
_LOGGER.info(audit.info("mode_of_operation = {} active = {}".format(
ServiceActivator._mode_of_operation, active)))
return active
@staticmethod
def determine_mode_of_operation(audit):
"""retrieves the mode_of_operation from service_activator"""
try:
ServiceActivator._lazy_init(audit)
target_entity = ServiceActivator._target_entity
if not ServiceActivator._url:
_LOGGER.info(audit.info("no url found for {}".format(target_entity)))
return ServiceActivator.is_active_mode_of_operation(audit)
url = ServiceActivator._url_register
json_body = deepcopy(ServiceActivator._post_register)
timeout_in_secs = ServiceActivator._timeout_in_secs
custom_kwargs = deepcopy(ServiceActivator._custom_kwargs)
metrics = Metrics(aud_parent=audit,
targetEntity="{} determine_mode_of_operation".format(target_entity),
targetServiceName=url)
headers = {REQUEST_X_ECOMP_REQUESTID : metrics.request_id}
log_action = "post to {} at {}".format(target_entity, url)
log_data = "headers={}, json_body={}, timeout_in_secs={}, custom_kwargs({})".format(
json.dumps(headers), json.dumps(json_body), timeout_in_secs,
json.dumps(custom_kwargs))
log_line = log_action + " " + log_data
_LOGGER.info(log_line)
metrics.metrics_start(log_line)
res = None
try:
res = requests.post(url, json=json_body, 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(
log_action, type(ex).__name__, str(ex), log_data)
_LOGGER.exception(error_msg)
metrics.set_http_status_code(error_code)
audit.set_http_status_code(error_code)
metrics.metrics(error_msg)
return ServiceActivator.is_active_mode_of_operation(audit)
metrics.set_http_status_code(res.status_code)
audit.set_http_status_code(res.status_code)
log_line = "response {} from {}: text={} {}".format(
res.status_code, log_action, res.text, log_data)
metrics.metrics(log_line)
if res.status_code != requests.codes.ok:
_LOGGER.error(log_line)
return ServiceActivator.is_active_mode_of_operation(audit)
result = res.json() or {}
ServiceActivator._mode_of_operation = (result.get(Config.MODE_OF_OPERATION)
or ServiceActivator._mode_of_operation)
return ServiceActivator.is_active_mode_of_operation(audit)
except Exception as ex:
return ServiceActivator.is_active_mode_of_operation(audit)
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