Handler Reference

Handlers are used to extend the system's functionality by implementing custom functions. They are Python modules with implemented functions. In the system, they are represented as function pointers, such as noc.main.handlers.default_handlers.empty_handler. The actual functions are registered in the system using the import string as a pointer to the function. For example, there is a default handler in the system located at main/handlers/default.py. When called, it prints the passed arguments.

List of Available Handlers

Name	Interface	Trigger	Settings
Config Filter	Allow Config Filter	Config scan	Managed Object
Config Diff Filter	Allow Config Diff Filter	Config scan	Managed Object
Config Validation	Allow Config Validation	Config scan	Managed Object
Address Resolver	Allow Address Resolver	Discovery scan	Managed Object Profile
Housekeeper	Allow Housekeeping	HK scan	Managed Object Profile
DS Filter	Allow DS Filter	Datastream scan	DS Filter
Iface Description	Allow Iface Description	ifDesc scan	Managed Object Profile

Examples

You can check a handler through ./noc shell:

from noc.core.mongo.connection import connect
from noc.core.handler import get_handler

connect()
h = get_handler(<handler_path>)
h()

Dumping Variables

This handler prints the provided arguments.

    def empty_handler(*args, **kwargs):
        print("[empty_handler] Arguments", args, kwargs)