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                                                                                                                                                                                     # Copyright (C) 2015 Canonical Ltd.
#
# This file is part of cloud-init. See LICENSE file for license information.

"""
cloud-init reporting framework

The reporting framework is intended to allow all parts of cloud-init to
report events in a structured manner.
"""

from ..registry import DictRegistry
from .handlers import available_handlers

DEFAULT_CONFIG = {
    "logging": {"type": "log"},
}


def update_configuration(config):
    """Update the instantiated_handler_registry.

    :param config:
        The dictionary containing changes to apply.  If a key is given
        with a False-ish value, the registered handler matching that name
        will be unregistered.
    """
    for handler_name, handler_config in config.items():
        if not handler_config:
            instantiated_handler_registry.unregister_item(
                handler_name, force=True
            )
            continue
        handler_config = handler_config.copy()
        cls = available_handlers.registered_items[handler_config.pop("type")]
        instantiated_handler_registry.unregister_item(handler_name)
        instance = cls(**handler_config)
        instantiated_handler_registry.register_item(handler_name, instance)


def flush_events():
    for _, handler in instantiated_handler_registry.registered_items.items():
        if hasattr(handler, "flush"):
            handler.flush()


instantiated_handler_registry = DictRegistry()
update_configuration(DEFAULT_CONFIG)

# vi: ts=4 expandtab