93 lines
2.8 KiB
Python
93 lines
2.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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proxy.py
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~~~~~~~~
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⚡⚡⚡ Fast, Lightweight, Pluggable, TLS interception capable proxy server focused on
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Network monitoring, controls & Application development, testing, debugging.
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:copyright: (c) 2013-present by Abhinav Singh and contributors.
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:license: BSD, see LICENSE for more details.
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"""
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import queue
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import threading
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import multiprocessing
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import logging
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import uuid
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from typing import Dict, Optional, Any, Callable
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from ...common.types import DictQueueType
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from .queue import EventQueue
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logger = logging.getLogger(__name__)
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class EventSubscriber:
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"""Core event subscriber."""
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def __init__(self, event_queue: EventQueue) -> None:
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self.manager = multiprocessing.Manager()
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self.event_queue = event_queue
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self.relay_thread: Optional[threading.Thread] = None
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self.relay_shutdown: Optional[threading.Event] = None
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self.relay_channel: Optional[DictQueueType] = None
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self.relay_sub_id: Optional[str] = None
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def subscribe(self, callback: Callable[[Dict[str, Any]], None]) -> None:
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self.relay_shutdown = threading.Event()
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self.relay_channel = self.manager.Queue()
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self.relay_thread = threading.Thread(
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target=self.relay,
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args=(self.relay_shutdown, self.relay_channel, callback))
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self.relay_thread.start()
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self.relay_sub_id = uuid.uuid4().hex
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self.event_queue.subscribe(self.relay_sub_id, self.relay_channel)
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logger.debug(
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'Subscribed relay sub id %s from core events',
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self.relay_sub_id)
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def unsubscribe(self) -> None:
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if self.relay_sub_id is None:
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logger.warning('Unsubscribe called without existing subscription')
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return
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assert self.relay_thread
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assert self.relay_shutdown
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assert self.relay_channel
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assert self.relay_sub_id
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try:
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self.event_queue.unsubscribe(self.relay_sub_id)
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except BrokenPipeError:
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pass
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except EOFError:
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pass
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self.relay_shutdown.set()
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self.relay_thread.join()
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logger.debug(
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'Un-subscribed relay sub id %s from core events',
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self.relay_sub_id)
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self.relay_thread = None
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self.relay_shutdown = None
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self.relay_channel = None
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self.relay_sub_id = None
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@staticmethod
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def relay(
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shutdown: threading.Event,
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channel: DictQueueType,
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callback: Callable[[Dict[str, Any]], None]) -> None:
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while not shutdown.is_set():
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try:
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ev = channel.get(timeout=1)
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callback(ev)
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except queue.Empty:
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pass
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except EOFError:
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break
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except KeyboardInterrupt:
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break
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