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###############################################################################
# Copyright (c) 2017 Koren Lev (Cisco Systems), Yaron Yogev (Cisco Systems) #
# and others #
# #
# All rights reserved. This program and the accompanying materials #
# are made available under the terms of the Apache License, Version 2.0 #
# which accompanies this distribution, and is available at #
# http://www.apache.org/licenses/LICENSE-2.0 #
###############################################################################
from discover.events.event_base import EventBase, EventResult
from utils.inventory_mgr import InventoryMgr
from utils.logging.full_logger import FullLogger
from utils.util import ClassResolver
class EventHandler:
def __init__(self, env: str, inventory_collection: str):
super().__init__()
self.inv = InventoryMgr()
self.inv.set_collections(inventory_collection)
self.env = env
self.log = FullLogger(env=env)
self.handlers = {}
def discover_handlers(self, handlers_package: str, event_handlers: dict):
if not event_handlers:
raise TypeError("Event handlers list is empty")
for event_name, handler_name in event_handlers.items():
handler = ClassResolver.get_instance_of_class(handler_name, handlers_package)
if not issubclass(handler.__class__, EventBase):
raise TypeError("Event handler '{}' is not a subclass of EventBase"
.format(handler_name))
if event_name in self.handlers:
self.log.warning("A handler is already registered for event type '{}'. Overwriting"
.format(event_name))
self.handlers[event_name] = handler
def handle(self, event_name: str, notification: dict) -> EventResult:
if event_name not in self.handlers:
self.log.info("No handler is able to process event of type '{}'"
.format(event_name))
return self.handlers[event_name].handle(self.env, notification)
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