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# This file is part of cloud-init. See LICENSE file for license information. """Classes and functions related to event handling.""" import logging from enum import Enum from typing import Dict, Set LOG = logging.getLogger(__name__) class EventScope(Enum): # NETWORK is currently the only scope, but we want to leave room to # grow other scopes (e.g., STORAGE) without having to make breaking # changes to the user config NETWORK = "network" def __str__(self): # pylint: disable=invalid-str-returned return self.value class EventType(Enum): """Event types which can generate maintenance requests for cloud-init.""" # Cloud-init should grow support for the follow event types: # HOTPLUG # METADATA_CHANGE # USER_REQUEST BOOT = "boot" BOOT_NEW_INSTANCE = "boot-new-instance" BOOT_LEGACY = "boot-legacy" HOTPLUG = "hotplug" def __str__(self): # pylint: disable=invalid-str-returned return self.value def userdata_to_events(user_config: dict) -> Dict[EventScope, Set[EventType]]: """Convert userdata into update config format defined on datasource. Userdata is in the form of (e.g): {'network': {'when': ['boot']}} DataSource config is in the form of: {EventScope.Network: {EventType.BOOT}} Take the first and return the second """ update_config = {} for scope, scope_list in user_config.items(): try: new_scope = EventScope(scope) except ValueError as e: LOG.warning( "%s! Update data will be ignored for '%s' scope", str(e), scope, ) continue try: new_values = [EventType(x) for x in scope_list["when"]] except ValueError as e: LOG.warning( "%s! Update data will be ignored for '%s' scope", str(e), scope, ) new_values = [] update_config[new_scope] = set(new_values) return update_config