+# Copyright 2019 Nokia
+
+# 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.
+import logging
+from Queue import Queue
+from threading import Thread
+
+from cmframework.server.cmsingleton import CMSingleton
+from cmframework.utils.cmalarmwork import CMAlarmWork
+from cmframework.apis import cmerror
+
+
+class AlarmHandler(Thread, CMSingleton):
+ def __init__(self):
+ super(AlarmHandler, self).__init__()
+
+ self.handler_lib = None
+ self.works = Queue()
+
+ self.daemon = True
+
+ def set_library_impl(self, handler_lib_impl_module, **kw):
+ try:
+ logging.debug('Loading alarmhandler lib from %s', handler_lib_impl_module)
+ # Separate class path and module name
+ parts = handler_lib_impl_module.rsplit('.', 1)
+ module_path = parts[0]
+ class_name = parts[1]
+ logging.debug('Importing %s from %s', class_name, module_path)
+ module = __import__(module_path, fromlist=[module_path])
+ classobj = getattr(module, class_name)
+ logging.debug('Constructing alarm handler lib with args %r', kw)
+ self.handler_lib = classobj(**kw)
+ except ImportError as exp1:
+ raise cmerror.CMError(str(exp1))
+ except Exception as exp2: # pylint: disable=broad-except
+ raise cmerror.CMError(str(exp2))
+
+ def cancel_alarm_with_dn(self,
+ alarm_id,
+ dn,
+ supplementary_info):
+ logging.debug('AlarmHandler.cancel_alarm_with_dn called')
+
+ alarmwork = CMAlarmWork(CMAlarmWork.OPER_CANCEL, alarm_id, dn, supplementary_info)
+
+ self._add_work(alarmwork)
+
+ def raise_alarm_with_dn(self,
+ alarm_id,
+ dn,
+ supplementary_info):
+ logging.debug('AlarmHandler.raise_alarm_with_dn called')
+
+ alarmwork = CMAlarmWork(CMAlarmWork.OPER_RAISE, alarm_id, dn, supplementary_info)
+
+ self._add_work(alarmwork)
+
+ def _get_work(self):
+ return self.works.get()
+
+ def _add_work(self, work):
+ logging.debug('AlarmHandler._add_work called with %s', work)
+
+ self.works.put(work)
+
+ def run(self):
+ while True:
+ work = self._get_work()
+ if self.handler_lib:
+ logging.debug('Asking handler lib to handle work: %s', work)
+ self.handler_lib.handle_alarm_work(work)
+ logging.debug('Handler lib handled work: %s', work)
+ else:
+ logging.warning('No handler lib set to handle work')