372 lines
12 KiB
Python
372 lines
12 KiB
Python
from contextlib import contextmanager
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import logging
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import os
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import signal
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import subprocess
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import sys
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from typing import Optional, Sequence
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from platypush.bus import Bus
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from platypush.bus.redis import RedisBus
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from platypush.cli import parse_cmdline
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from platypush.commands import CommandStream
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from platypush.config import Config
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from platypush.context import register_backends, register_plugins
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from platypush.cron.scheduler import CronScheduler
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from platypush.entities import init_entities_engine, EntitiesEngine
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from platypush.event.processor import EventProcessor
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from platypush.logger import Logger
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from platypush.message.event import Event
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from platypush.message.event.application import ApplicationStartedEvent
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from platypush.message.request import Request
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from platypush.message.response import Response
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from platypush.utils import get_enabled_plugins, get_redis_conf
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log = logging.getLogger('platypush')
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class Application:
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"""Main class for the Platypush application."""
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# Default Redis port
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_default_redis_port = 6379
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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__(
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self,
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config_file: Optional[str] = None,
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workdir: Optional[str] = None,
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logsdir: Optional[str] = None,
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pidfile: Optional[str] = None,
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requests_to_process: Optional[int] = None,
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no_capture_stdout: bool = False,
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no_capture_stderr: bool = False,
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redis_queue: Optional[str] = None,
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verbose: bool = False,
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start_redis: bool = False,
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redis_host: Optional[str] = None,
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redis_port: Optional[int] = None,
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ctrl_sock: Optional[str] = None,
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):
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"""
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:param config_file: Configuration file override (default: None).
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:param workdir: Overrides the ``workdir`` setting in the configuration
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file (default: None).
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:param logsdir: Set logging directory. If not specified, the
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``filename`` setting under the ``logging`` section of the
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configuration file is used. If not set, logging will be sent to
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stdout and stderr.
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:param pidfile: File where platypush will store its PID upon launch,
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useful if you're planning to integrate the application within a
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service or a launcher script (default: None).
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:param requests_to_process: Exit after processing the specified
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number of requests (default: None, loop forever).
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:param no_capture_stdout: Set to true if you want to disable the
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stdout capture by the logging system (default: False).
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:param no_capture_stderr: Set to true if you want to disable the
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stderr capture by the logging system (default: False).
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:param redis_queue: Name of the (Redis) queue used for dispatching
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messages (default: platypush/bus).
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:param verbose: Enable debug/verbose logging, overriding the stored
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configuration (default: False).
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:param start_redis: If set, it starts a managed Redis instance upon
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boot (it requires the ``redis-server`` executable installed on the
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server). This is particularly useful when running the application
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inside of Docker containers, without relying on ``docker-compose``
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to start multiple containers, and in tests (default: False).
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:param redis_host: Host of the Redis server to be used. It overrides
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the settings in the ``redis`` section of the configuration file.
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:param redis_port: Port of the local Redis server. It overrides the
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settings in the ``redis`` section of the configuration file.
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:param ctrl_sock: If set, it identifies a path to a UNIX domain socket
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that the application can use to send control messages (e.g. STOP
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and RESTART) to its parent.
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"""
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self.pidfile = pidfile
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self.bus: Optional[Bus] = None
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self.redis_queue = redis_queue or RedisBus.DEFAULT_REDIS_QUEUE
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self.config_file = config_file
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self._verbose = verbose
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self._logsdir = (
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os.path.abspath(os.path.expanduser(logsdir)) if logsdir else None
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)
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Config.init(self.config_file)
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Config.set('ctrl_sock', ctrl_sock)
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if workdir:
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Config.set('workdir', os.path.abspath(os.path.expanduser(workdir)))
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self.no_capture_stdout = no_capture_stdout
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self.no_capture_stderr = no_capture_stderr
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self.event_processor = EventProcessor()
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self.entities_engine: Optional[EntitiesEngine] = None
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self.requests_to_process = requests_to_process
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self.processed_requests = 0
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self.cron_scheduler = None
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self.start_redis = start_redis
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self.redis_host = redis_host
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self.redis_port = redis_port
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self.redis_conf = {}
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self._redis_proc: Optional[subprocess.Popen] = None
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self.cmd_stream = CommandStream(ctrl_sock)
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self._init_bus()
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self._init_logging()
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def _init_bus(self):
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self._redis_conf = get_redis_conf()
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self._redis_conf['port'] = self.redis_port or self._redis_conf.get(
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'port', self._default_redis_port
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)
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if self.redis_host:
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self._redis_conf['host'] = self.redis_host
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Config.set('redis', self._redis_conf)
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self.bus = RedisBus(
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redis_queue=self.redis_queue,
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on_message=self.on_message(),
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**self._redis_conf,
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)
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def _init_logging(self):
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logging_conf = Config.get('logging') or {}
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if self._verbose:
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logging_conf['level'] = logging.DEBUG
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if self._logsdir:
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logging_conf['filename'] = os.path.join(self._logsdir, 'platypush.log')
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logging_conf.pop('stream', None)
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Config.set('logging', logging_conf)
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logging.basicConfig(**logging_conf)
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def _start_redis(self):
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if self._redis_proc and self._redis_proc.poll() is None:
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log.warning(
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'A local Redis instance is already running, refusing to start it again'
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)
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return
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port = self._redis_conf['port']
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log.info('Starting local Redis instance on %s', port)
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redis_cmd_args = [
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'redis-server',
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'--bind',
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'localhost',
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'--port',
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str(port),
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]
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try:
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self._redis_proc = subprocess.Popen( # pylint: disable=consider-using-with
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redis_cmd_args,
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stdout=subprocess.PIPE,
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)
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except Exception as e:
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log.error(
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'Failed to start local Redis instance: "%s": %s',
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' '.join(redis_cmd_args),
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e,
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)
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sys.exit(1)
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log.info('Waiting for Redis to start')
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for line in self._redis_proc.stdout: # type: ignore
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if b'Ready to accept connections' in line:
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break
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def _stop_redis(self):
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if self._redis_proc and self._redis_proc.poll() is None:
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log.info('Stopping local Redis instance')
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self._redis_proc.kill()
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self._redis_proc = None
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@classmethod
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def from_cmdline(cls, args: Sequence[str]) -> "Application":
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"""
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Build the app from command line arguments.
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"""
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opts = parse_cmdline(args)
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return cls(
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config_file=opts.config,
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workdir=opts.workdir,
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logsdir=opts.logsdir,
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pidfile=opts.pidfile,
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no_capture_stdout=opts.no_capture_stdout,
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no_capture_stderr=opts.no_capture_stderr,
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redis_queue=opts.redis_queue,
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verbose=opts.verbose,
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start_redis=opts.start_redis,
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redis_host=opts.redis_host,
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redis_port=opts.redis_port,
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ctrl_sock=opts.ctrl_sock,
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)
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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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log.info('Dropped unauthorized request: %s', msg)
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self.processed_requests += 1
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if (
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self.requests_to_process
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and self.processed_requests >= self.requests_to_process
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):
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self.stop()
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elif isinstance(msg, Response):
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msg.log()
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elif isinstance(msg, Event):
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msg.log()
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self.event_processor.process_event(msg)
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return _f
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def stop(self):
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"""Stops the backends and the bus."""
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from platypush.plugins import RunnablePlugin
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log.info('Stopping the application')
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backends = (self.backends or {}).copy().values()
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runnable_plugins = [
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plugin
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for plugin in get_enabled_plugins().values()
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if isinstance(plugin, RunnablePlugin)
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]
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for backend in backends:
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backend.stop()
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for plugin in runnable_plugins:
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plugin.stop()
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for backend in backends:
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backend.wait_stop()
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for plugin in runnable_plugins:
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plugin.wait_stop()
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if self.entities_engine:
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self.entities_engine.stop()
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self.entities_engine.wait_stop()
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self.entities_engine = None
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if self.cron_scheduler:
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self.cron_scheduler.stop()
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self.cron_scheduler.wait_stop()
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self.cron_scheduler = None
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if self.bus:
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self.bus.stop()
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self.bus = None
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if self.start_redis:
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self._stop_redis()
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log.info('Exiting application')
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@contextmanager
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def _open_pidfile(self):
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if self.pidfile:
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try:
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with open(self.pidfile, 'w') as f:
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f.write(str(os.getpid()))
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except OSError as e:
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log.warning('Failed to create PID file %s: %s', self.pidfile, e)
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yield
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if self.pidfile:
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try:
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os.remove(self.pidfile)
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except OSError as e:
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log.warning('Failed to remove PID file %s: %s', self.pidfile, e)
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def _run(self):
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from platypush import __version__
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if not self.no_capture_stdout:
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sys.stdout = Logger(log.info)
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if not self.no_capture_stderr:
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sys.stderr = Logger(log.warning)
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log.info('---- Starting platypush v.%s', __version__)
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# Start the local Redis service if required
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if self.start_redis:
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self._start_redis()
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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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# Initialize the plugins
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register_plugins(bus=self.bus)
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# Initialize the entities engine
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self.entities_engine = init_entities_engine()
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# Start the cron scheduler
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if Config.get_cronjobs():
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self.cron_scheduler = CronScheduler(jobs=Config.get_cronjobs())
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self.cron_scheduler.start()
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assert self.bus, 'The bus is not running'
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self.bus.post(ApplicationStartedEvent())
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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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log.info('SIGINT received, terminating application')
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# Ignore other SIGINT signals
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signal.signal(signal.SIGINT, signal.SIG_IGN)
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finally:
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self.stop()
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def run(self):
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"""Run the application."""
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with self._open_pidfile():
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self._run()
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def main(*args: str):
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"""
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Application entry point.
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"""
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app = Application.from_cmdline(args)
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try:
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app.run()
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except KeyboardInterrupt:
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pass
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return 0
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# vim:sw=4:ts=4:et:
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