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test_multi_connect.py
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import unittest
import _thread
import time
from mpos import App, AppManager, TaskManager
from websocket import WebSocketApp
# demo_multiple_ws.py
import asyncio
import aiohttp
from aiohttp import WSMsgType
import logging
import sys
from typing import List
# ----------------------------------------------------------------------
# Logging
# ----------------------------------------------------------------------
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s [%(levelname)s] %(message)s",
stream=sys.stdout,
)
log = logging.getLogger(__name__)
class TestTwoWebsockets(unittest.TestCase):
#class TestTwoWebsockets():
# ----------------------------------------------------------------------
# Configuration
# ----------------------------------------------------------------------
# Change these to point to a real echo / chat server you control.
WS_URLS = [
"wss://echo.websocket.org", # public echo service (may be down)
"wss://echo.websocket.org", # duplicate on purpose – shows concurrency
"wss://echo.websocket.org",
# add more URLs here…
]
nr_connected = 0
# How many messages each connection should send before closing gracefully
MESSAGES_PER_CONNECTION = 2
STOP_AFTER = 10
# ----------------------------------------------------------------------
# One connection worker
# ----------------------------------------------------------------------
async def ws_worker(self, session: aiohttp.ClientSession, url: str, idx: int) -> None:
"""
Handles a single WebSocket connection:
* sends a few messages,
* echoes back everything it receives,
* closes when the remote end says "close" or after MESSAGES_PER_CONNECTION.
"""
try:
async with session.ws_connect(url) as ws:
log.info(f"[{idx}] Connected to {url}")
self.nr_connected += 1
# ------------------------------------------------------------------
# 1. Send a few starter messages
# ------------------------------------------------------------------
for i in range(self.MESSAGES_PER_CONNECTION):
payload = f"Hello from client #{idx} – msg {i+1}"
await ws.send_str(payload)
log.info(f"[{idx}] → {payload}")
# give the server a moment to reply
await asyncio.sleep(0.5)
# ------------------------------------------------------------------
# 2. Echo-loop – react to incoming messages
# ------------------------------------------------------------------
msgcounter = 0
async for msg in ws:
msgcounter += 1
if msgcounter > self.STOP_AFTER:
print("Max reached, stopping...")
await ws.close()
break
if msg.type == WSMsgType.TEXT:
data: str = msg.data
log.info(f"[{idx}] ← {data}")
# Echo back (with a suffix)
reply = data + " / answer"
await ws.send_str(reply)
log.info(f"[{idx}] → {reply}")
# Close if server asks us to
if data.strip().lower() == "close cmd":
log.info(f"[{idx}] Server asked to close → closing")
await ws.close()
break
elif msg.type in (WSMsgType.CLOSE, WSMsgType.CLOSING, WSMsgType.CLOSED):
log.info(f"[{idx}] Connection closed by remote")
break
elif msg.type == WSMsgType.ERROR:
log.error(f"[{idx}] WebSocket error: {ws.exception()}")
break
except asyncio.CancelledError:
log.info(f"[{idx}] Task cancelled")
raise
except Exception as exc:
log.exception(f"[{idx}] Unexpected error on {url}: {exc}")
finally:
log.info(f"[{idx}] Worker finished for {url}")
# ----------------------------------------------------------------------
# Main entry point – creates a single ClientSession + many tasks
# ----------------------------------------------------------------------
async def main(self) -> None:
async with aiohttp.ClientSession() as session:
# Create one task per URL (they all run concurrently)
tasks = [
asyncio.create_task(self.ws_worker(session, url, idx))
for idx, url in enumerate(self.WS_URLS)
]
log.info(f"Starting {len(tasks)} concurrent WebSocket connections…")
# Wait for *all* of them to finish (or be cancelled)
await asyncio.gather(*tasks, return_exceptions=True)
log.info(f"All tasks stopped successfully!")
self.assertTrue(self.nr_connected, len(self.WS_URLS))
def newthread(self):
asyncio.run(self.main())
def test_it(self):
_thread.stack_size(TaskManager.good_stack_size())
_thread.start_new_thread(self.newthread, ())
time.sleep(10)
# This demonstrates a crash when doing asyncio using different threads:
#class TestCrashingSeparateThreads(unittest.TestCase):
class TestCrashingSeparateThreads(): # Disabled
# ----------------------------------------------------------------------
# Configuration
# ----------------------------------------------------------------------
# Change these to point to a real echo / chat server you control.
WS_URLS = [
"wss://echo.websocket.org", # public echo service (may be down)
"wss://echo.websocket.org", # duplicate on purpose – shows concurrency
"wss://echo.websocket.org",
# add more URLs here…
]
# How many messages each connection should send before closing gracefully
MESSAGES_PER_CONNECTION = 2
STOP_AFTER = 10
# ----------------------------------------------------------------------
# One connection worker
# ----------------------------------------------------------------------
async def ws_worker(self, session: aiohttp.ClientSession, url: str, idx: int) -> None:
"""
Handles a single WebSocket connection:
* sends a few messages,
* echoes back everything it receives,
* closes when the remote end says "close" or after MESSAGES_PER_CONNECTION.
"""
try:
async with session.ws_connect(url) as ws:
log.info(f"[{idx}] Connected to {url}")
# ------------------------------------------------------------------
# 1. Send a few starter messages
# ------------------------------------------------------------------
for i in range(self.MESSAGES_PER_CONNECTION):
payload = f"Hello from client #{idx} – msg {i+1}"
await ws.send_str(payload)
log.info(f"[{idx}] → {payload}")
# give the server a moment to reply
await asyncio.sleep(0.5)
# ------------------------------------------------------------------
# 2. Echo-loop – react to incoming messages
# ------------------------------------------------------------------
msgcounter = 0
async for msg in ws:
msgcounter += 1
if msgcounter > self.STOP_AFTER:
print("Max reached, stopping...")
await ws.close()
break
if msg.type == WSMsgType.TEXT:
data: str = msg.data
log.info(f"[{idx}] ← {data}")
# Echo back (with a suffix)
reply = data + " / answer"
await ws.send_str(reply)
log.info(f"[{idx}] → {reply}")
# Close if server asks us to
if data.strip().lower() == "close cmd":
log.info(f"[{idx}] Server asked to close → closing")
await ws.close()
break
elif msg.type in (WSMsgType.CLOSE, WSMsgType.CLOSING, WSMsgType.CLOSED):
log.info(f"[{idx}] Connection closed by remote")
break
elif msg.type == WSMsgType.ERROR:
log.error(f"[{idx}] WebSocket error: {ws.exception()}")
break
except asyncio.CancelledError:
log.info(f"[{idx}] Task cancelled")
raise
except Exception as exc:
log.exception(f"[{idx}] Unexpected error on {url}: {exc}")
finally:
log.info(f"[{idx}] Worker finished for {url}")
# ----------------------------------------------------------------------
# Main entry point – creates a single ClientSession + many tasks
# ----------------------------------------------------------------------
async def main(self) -> None:
async with aiohttp.ClientSession() as session:
# Create one task per URL (they all run concurrently)
tasks = [
asyncio.create_task(self.ws_worker(session, url, idx))
for idx, url in enumerate(self.WS_URLS)
]
log.info(f"Starting {len(tasks)} concurrent WebSocket connections…")
# Wait for *all* of them to finish (or be cancelled)
await asyncio.gather(*tasks, return_exceptions=True)
async def almostmain(self, url):
async with aiohttp.ClientSession() as session:
asyncio.create_task(self.ws_worker(session, url, idx))
def newthread(self, url):
asyncio.run(self.main())
def test_it(self):
for url in self.WS_URLS:
_thread.stack_size(TaskManager.good_stack_size())
_thread.start_new_thread(self.newthread, (url,))
time.sleep(15)