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67 lines
2.6 KiB
Python
67 lines
2.6 KiB
Python
import threading
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import telegram
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import strings
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import configloader
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import sys
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import queue as queuem
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class StopSignal:
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"""A data class that should be sent to the worker when the conversation has to be stopped abnormally."""
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def __init__(self, reason: str=""):
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self.reason = reason
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class ChatWorker(threading.Thread):
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"""A worker for a single conversation. A new one is created every time the /start command is sent."""
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def __init__(self, bot: telegram.Bot, chat: telegram.Chat, *args, **kwargs):
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# Initialize the thread
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super().__init__(name=f"ChatThread {chat.first_name}", *args, **kwargs)
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# Store the bot and chat info inside the class
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self.bot = bot
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self.chat = chat
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# The sending pipe is stored in the ChatWorker class, allowing the forwarding of messages to the chat process
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self.queue = queuem.Queue()
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def run(self):
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"""The conversation code."""
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# TODO: catch all the possible exceptions
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# Welcome the user to the bot
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self.bot.send_message(self.chat.id, strings.conversation_after_start)
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# TODO: Send a command list or something
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while True:
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# For now, echo the sent message
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update = self._receive_next_update()
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self.bot.send_message(self.chat.id, f"{threading.current_thread().name} {update.message.text}")
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def stop(self, reason: str=""):
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"""Gracefully stop the worker process"""
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# Send a stop message to the thread
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self.queue.put(StopSignal(reason))
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# Wait for the thread to stop
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self.join()
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def _receive_next_update(self) -> telegram.Update:
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"""Get the next update from the queue.
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If no update is found, block the process until one is received.
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If a stop signal is sent, try to gracefully stop the thread."""
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# Pop data from the queue
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try:
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data = self.queue.get(timeout=int(configloader.config["Telegram"]["conversation_timeout"]))
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except queuem.Empty:
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# If the conversation times out, gracefully stop the thread
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self._graceful_stop()
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# Check if the data is a stop signal instance
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if isinstance(data, StopSignal):
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# Gracefully stop the process
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self._graceful_stop()
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# Return the received update
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return data
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def _graceful_stop(self):
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"""Handle the graceful stop of the thread."""
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# Notify the user that the session has expired
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self.bot.send_message(self.chat.id, strings.conversation_expired)
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# End the process
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sys.exit(0)
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