steffo/greed
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Use threads instead of processes

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This commit is contained in:
Steffo 2017-12-14 08:53:16 +01:00
parent 15e80ad644
commit 1ee792e9ee
2 changed files with 25 additions and 26 deletions
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6
core.py
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@ -62,13 +62,13 @@ def main():
# Otherwise, forward the update to the corresponding worker
receiving_worker = chat_workers.get(update.message.chat.id)
# Ensure a worker exists for the chat and is alive
if receiving_worker is None or not receiving_worker.process.is_alive():
if receiving_worker is None or not receiving_worker.thread.is_alive():
# Suggest that the user restarts the chat with /start
bot.send_message(update.message.chat.id, strings.error_no_worker_for_chat)
# Skip the update
continue
# Forward the update to the worker
receiving_worker.pipe.send(update)
receiving_worker.queue.put(update)
# If the update is a inline keyboard press...
if update.inline_query is not None:
# Forward the update to the corresponding worker
@ -80,7 +80,7 @@ def main():
# Skip the update
continue
# Forward the update to the worker
receiving_worker.pipe.send(update)
receiving_worker.queue.put(update)
# If there were any updates...
if len(updates):
# Mark them as read by increasing the update_offset

45
worker.py
View file

@ -1,8 +1,9 @@
import multiprocessing
import threading
import telegram
import strings
import configloader
import sys
import queue as queuem
# Load the configuration
config = configloader.load_config()
@ -18,52 +19,50 @@ class ChatWorker:
"""A worker for a single conversation. A new one should be created every time the /start command is sent."""
def __init__(self, bot: telegram.Bot, chat: telegram.Chat):
# A pipe connecting the main process to the chat process is created
out_pipe, in_pipe = multiprocessing.Pipe(duplex=False)
# The sending pipe is stored in the ChatWorker class, allowing the forwarding of messages to the chat process
self.pipe = in_pipe
# A new process running the conversation handler is created, and the receiving pipe is passed to its arguments to enable the receiving of messages
self.process = multiprocessing.Process(target=conversation_handler, args=(bot, chat, out_pipe))
self.queue = queuem.Queue()
# A new thread running the conversation handler is created, and the queue is passed to its arguments to enable the receiving of messages
self.thread = threading.Thread(target=conversation_handler, args=(bot, chat, self.queue))
def start(self):
"""Start the worker process."""
self.process.start()
self.thread.start()
def stop(self, reason: str=""):
"""Gracefully stop the worker process"""
# Send a stop message to the process
self.pipe.send(StopSignal(reason))
# Wait for the process to stop
self.process.join()
# Send a stop message to the thread
self.queue.put(StopSignal(reason))
# Wait for the thread to stop
self.thread.join()
# TODO: maybe move these functions to a class
def graceful_stop(bot: telegram.Bot, chat: telegram.Chat, pipe):
def graceful_stop(bot: telegram.Bot, chat: telegram.Chat, queue):
"""Handle the graceful stop of the process."""
# Notify the user that the session has expired
bot.send_message(chat.id, strings.conversation_expired)
# End the process
sys.exit(0)
def receive_next_update(bot: telegram.Bot, chat: telegram.Chat, pipe) -> telegram.Update:
def receive_next_update(bot: telegram.Bot, chat: telegram.Chat, queue) -> telegram.Update:
"""Get the next update from a pipe.
If no update is found, block the process until one is received.
If a stop signal is sent, try to gracefully stop the process."""
# Wait until some data is present in the pipe or the wait time runs out
if not pipe.poll(int(config["Telegram"]["conversation_timeout"])):
# If the conversation times out, gracefully stop the process
graceful_stop(bot, chat, pipe)
# Receive data from the pipe
data = pipe.recv()
# Pop data from the queue
try:
data = queue.get(timeout=int(config["Telegram"]["conversation_timeout"]))
except queuem.Empty:
# If the conversation times out, gracefully stop the thread
graceful_stop(bot, chat, queue)
# Check if the data is a stop signal instance
if isinstance(data, StopSignal):
# Gracefully stop the process
graceful_stop(bot, chat, pipe)
graceful_stop(bot, chat, queue)
# Return the received update
return data
def conversation_handler(bot: telegram.Bot, chat: telegram.Chat, pipe):
def conversation_handler(bot: telegram.Bot, chat: telegram.Chat, queue):
"""This function is ran once for every conversation (/start command) by a separate process."""
# TODO: catch all the possible exceptions
# Welcome the user to the bot
@ -71,5 +70,5 @@ def conversation_handler(bot: telegram.Bot, chat: telegram.Chat, pipe):
# TODO: Send a command list or something
while True:
# For now, echo the sent message
update = receive_next_update(bot, chat, pipe)
bot.send_message(chat.id, f"{multiprocessing.current_process().name} {update.message.text}")
update = receive_next_update(bot, chat, queue)
bot.send_message(chat.id, f"{threading.current_thread().name} {update.message.text}")