help pls, when func A and func B are in defference Sanic-Server, same global asyncio.Event() var in them cant sync

[ShelbyCheng]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

when func A and func B are in different Sanic-Server, same global asyncio.Event() var in them cant sync

Code snippet

generate_event = asyncio.Event()
generate_event.clear()

async def gg(req: request):
debug_logger.info('gg func start')
global generate_event
generate_event.clear()
async def generate_answer1(response):
i = 0
while i < 1000:
i += 1
response_str = "delta_answer"
response_status = "running"
debug_logger.info('gg func {} 1'.format(response_status))
stream_res = {
"code": 200,
"msg": str(i),
"question": "",
"response": response_str,
"history": [],
"source_documents": [],
}
debug_logger.info('gg func {} 2'.format(response_status))
await response.write(f"data: {json.dumps(stream_res, ensure_ascii=False)}\n\n")
debug_logger.info('gg func {} 3'.format(response_status))
await asyncio.sleep(0.001)
if generate_event.is_set():
response_str = "final"
response_status = "stop"
debug_logger.info('gg func {} 1'.format(response_status))
stream_res = {
"code": 200,
"msg": str(i),
"question": "",
"response": response_str,
"history": [],
"source_documents": [],
}
debug_logger.info('gg func {} 2'.format(response_status))
await response.write(f"data: {json.dumps(stream_res, ensure_ascii=False)}\n\n")
debug_logger.info('gg func {} 3'.format(response_status))
await response.eof()
debug_logger.info('gg func {} 4'.format(response_status))
response_stream = ResponseStream(generate_answer1, content_type='text/event-stream')
return response_stream

async def change_generate(req: request):
global generate_event
generate = safe_get(req, 'generate', True)
debug_logger.info('generate status change')
if not generate:
generate_event.set()
if generate_event.is_set():
debug_logger.info('generate_event is set')
debug_logger.info('generate became False')
else:
debug_logger.info('generate is True')
generate_event.clear()
return sanic_json({"code": 200, "msg": "generate status {}".format(generate)})

Expected Behavior

test function below does not work as expected, sometimes it works, and sometimes it does not.

def stream_requests(data_raw, func_name):
url = 'http://192.168.13.216:8777/api/local_doc_qa/{}'.format(func_name)
response = requests.post(
url,
json=data_raw,
timeout=60,
stream=True
)
for line in response.iter_lines(decode_unicode=False, delimiter=b"\n\n"):
if line:
yield line

def test():
data_raw = {
}
data_raw1 = {
"generate": False,
}
url = "http://192.168.13.216:8777/api/local_doc_qa/change_generate"
headers = {
"Content-Type": "application/json"
}
for i, chunk in enumerate(stream_requests(data_raw, "gg")):
if chunk:
chunkstr = chunk.decode("utf-8")[6:]
chunkjs = json.loads(chunkstr)
print(chunkjs)
if i == 5:
print('try to stop')
response = requests.post(url, headers=headers, data=json.dumps(data_raw1))
print(response.text)
print('did get through')

if name == 'main':
test()

logs like the below:

a case that works:

a case that does not work:

How do you run Sanic?

As a script (app.run or Sanic.serve)

Operating System

Linux

Sanic Version

23.12.1

Additional context

No response

[Adam Hopkins]

It is really hard to read this code, and it doesn't look like there's anything Sanic specific there. By your own admission it works sometime and not others which points to a race condition in your code and it doesn't sound like anything related to Sanic.

Furthermore, this is a support question, not a bug. Please see our help section for ways in which we can offer support: https://sanic.dev/en/help.html.