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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