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""" |
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syslog2irc.main |
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~~~~~~~~~~~~~~~ |
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Orchestration, application entry point |
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:Copyright: 2007-2021 Jochen Kupperschmidt |
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:License: MIT, see LICENSE for details. |
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""" |
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from __future__ import annotations |
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import logging |
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from queue import SimpleQueue |
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from typing import Callable, Optional, Tuple |
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from syslogmp import Message as SyslogMessage |
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from .cli import parse_args |
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from .config import Config, load_config |
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from .formatting import format_message |
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from .irc import create_bot |
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from .network import Port |
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from .routing import Router |
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from .signals import irc_channel_joined, syslog_message_received |
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from .syslog import start_syslog_message_receivers |
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from .util import configure_logging |
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logger = logging.getLogger(__name__) |
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FormatMessageCallable = Callable[[Tuple[str, int], SyslogMessage], str] |
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# A note on threads (implementation detail): |
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# |
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# This application uses threads. Besides the main thread there is one |
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# thread for *each* syslog message receiver (which itself is a threading |
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# server!) and one thread for the (actual) IRC bot. (The dummy bot does |
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# not run in a separate thread.) |
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# Those threads are configured to be daemon threads. A Python |
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# application exits if no more non-daemon threads are running. |
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# |
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# For details, consult the documentation on the `threading` module that |
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# is part of Python's standard library. |
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class Processor: |
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def __init__( |
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self, |
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config: Config, |
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*, |
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custom_format_message: Optional[FormatMessageCallable] = None, |
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) -> None: |
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self.irc_bot = create_bot(config.irc) |
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self.syslog_ports = {route.syslog_port for route in config.routes} |
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self.router = Router(config.routes) |
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self.message_queue: SimpleQueue = SimpleQueue() |
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if custom_format_message is not None: |
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self.format_message = custom_format_message |
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else: |
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self.format_message = format_message |
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# Up to this point, no signals must have been sent. |
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self.connect_to_signals() |
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# Signals are allowed be sent from here on. |
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def connect_to_signals(self) -> None: |
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irc_channel_joined.connect(self.router.enable_channel) |
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syslog_message_received.connect(self.handle_syslog_message) |
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def handle_syslog_message( |
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self, |
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port: Port, |
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*, |
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source_address: Optional[tuple[str, int]] = None, |
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message: Optional[SyslogMessage] = None, |
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) -> None: |
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"""Process an incoming syslog message.""" |
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self.message_queue.put((port, source_address, message)) |
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def announce_message( |
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self, |
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port: Port, |
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source_address: tuple[str, int], |
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message: SyslogMessage, |
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) -> None: |
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"""Announce message on IRC.""" |
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channel_names = self.router.get_channel_names_for_port(port) |
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text = self.format_message(source_address, message) |
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for channel_name in channel_names: |
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if self.router.is_channel_enabled(channel_name): |
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self.irc_bot.say(channel_name, text) |
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def run(self) -> None: |
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"""Start network-based components, run main loop.""" |
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self.irc_bot.start() |
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start_syslog_message_receivers(self.syslog_ports) |
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try: |
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while True: |
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port, source_address, message = self.message_queue.get() |
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self.announce_message(port, source_address, message) |
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except KeyboardInterrupt: |
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pass |
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logger.info('Shutting down ...') |
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self.irc_bot.disconnect('Bye.') # Joins bot thread. |
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def main( |
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*, custom_format_message: Optional[FormatMessageCallable] = None |
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) -> None: |
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"""Parse arguments, load configuration, and start the application.""" |
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args = parse_args() |
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config = load_config(args.config_filename) |
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configure_logging(config.log_level) |
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processor = Processor(config, custom_format_message=custom_format_message) |
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processor.run() |
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1 |
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if __name__ == '__main__': |
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main() |
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homeworkprod /
syslog2irc
