155 lines
4.4 KiB
Python
155 lines
4.4 KiB
Python
"""
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Platypush
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.. moduleauthor:: Fabio Manganiello <blacklight86@gmail.com>
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.. license:: MIT
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"""
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import argparse
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import logging
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import sys
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import traceback
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from threading import Thread
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from .bus import Bus
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from .config import Config
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from .context import register_backends
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from .cron.scheduler import CronScheduler
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from .event.processor import EventProcessor
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from .message.event import Event, StopEvent
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from .message.request import Request
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from .message.response import Response
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__author__ = 'Fabio Manganiello <blacklight86@gmail.com>'
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__version__ = '0.9'
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LOGGER = logging.getLogger(__name__)
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class Daemon:
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""" Main class for the Platypush daemon """
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# Configuration file (default: either ~/.config/platypush/config.yaml or
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# /etc/platypush/config.yaml
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config_file = None
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# Application bus. It's an internal queue where:
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# - backends will post the messages they receive
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# - plugins will post the responses they process
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bus = None
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# backend_name => backend_obj map
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backends = None
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# number of executions retries before a request fails
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n_tries = 2
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def __init__(self, config_file=None, requests_to_process=None):
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"""
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Constructor
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Params:
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config_file -- Configuration file override (default: None)
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requests_to_process -- Exit after processing the specified number
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of requests (default: None, loop forever)
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"""
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self.config_file = config_file
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self.event_processor = EventProcessor()
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self.requests_to_process = requests_to_process
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self.processed_requests = 0
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Config.init(self.config_file)
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logging.basicConfig(**Config.get('logging'))
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@classmethod
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def build_from_cmdline(cls, args):
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"""
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Build the app from command line arguments.
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Params:
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args -- Your sys.argv[1:] [List of strings]
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"""
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parser = argparse.ArgumentParser()
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parser.add_argument('--config', '-c', dest='config', required=False,
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default=None, help=cls.config_file.__doc__)
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opts, args = parser.parse_known_args(args)
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return cls(config_file=opts.config)
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def on_message(self):
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"""
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Default message handler
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"""
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def _f(msg):
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"""
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on_message closure
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Params:
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msg -- platypush.message.Message instance
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"""
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if isinstance(msg, Request):
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try:
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msg.execute(n_tries=self.n_tries)
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except PermissionError:
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LOGGER.info('Dropped unauthorized request: {}'.format(msg))
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self.processed_requests += 1
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if self.requests_to_process \
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and self.processed_requests >= self.requests_to_process:
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self.stop_app()
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elif isinstance(msg, Response):
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LOGGER.info('Received response: {}'.format(msg))
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elif isinstance(msg, StopEvent) and msg.targets_me():
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LOGGER.info('Received STOP event: {}'.format(msg))
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self.stop_app()
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elif isinstance(msg, Event):
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LOGGER.info('Received event: {}'.format(msg))
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self.event_processor.process_event(msg)
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return _f
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def stop_app(self):
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""" Stops the backends and the bus """
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for backend in self.backends.values():
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backend.stop()
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self.bus.stop()
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def start(self):
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""" Start the daemon """
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self.bus = Bus(on_message=self.on_message())
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# Initialize the backends and link them to the bus
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self.backends = register_backends(bus=self.bus, global_scope=True)
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# Start the backend threads
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for backend in self.backends.values():
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backend.start()
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# Start the cron scheduler
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if Config.get_cronjobs():
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CronScheduler(jobs=Config.get_cronjobs()).start()
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# Poll for messages on the bus
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try:
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self.bus.poll()
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except KeyboardInterrupt:
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LOGGER.info('SIGINT received, terminating application')
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finally:
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self.stop_app()
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def main():
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"""
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Platypush daemon main
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"""
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print('Starting platypush v.{}'.format(__version__))
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app = Daemon.build_from_cmdline(sys.argv[1:])
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app.start()
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# vim:sw=4:ts=4:et:
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