help pls with RuntimeError: no running event loop

[danial29rus]

Hello everyone!

Please tell me if anyone has encountered a problem in granian
with the error RuntimeError: no running event loop

I launch the application like this
command: >-
sh -c "
granian --interface asgi app.main:app --access-log --workers=12 --host=0.0.0.0 --port=8021 --backlog=16192
"
What could be the problem?

I'm switching back to uvicorn and I don't encounter this error

[gi0baro]

@danial29rus you have something in your application bootstrap that initialise the event loop, but that's not supported in Granian. You should use asyncio.get_event_loop() in case you need the running loop.

[gi0baro]

Then you should provide more details, like:

• a stacktrace
• OS, Python version, event-loop used
• runtime (docker, k8s, host)
• description of the type of workload (including but not limited to the framework/libs used)

[danial29rus]

Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/connection.py", line 782, in read_response
response = await self._parser.read_response(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
GeneratorExit

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.12/site-packages/opentelemetry/trace/init.py", line 570, in use_span
yield span
File "/usr/local/lib/python3.12/site-packages/opentelemetry/sdk/trace/init.py", line 1091, in start_as_current_span
yield span
File "/usr/local/lib/python3.12/site-packages/opentelemetry/trace/init.py", line 437, in start_as_current_span
yield span
File "/app/app/business_services/vehicles.py", line 434, in get_catalog_data_paginated
await self.cache_service.set_cache(cache_key=cache_key, data=data)
File "/app/app/business_services/cache.py", line 31, in set_cache
await self._client.set(
File "/app/app/db/cache/tools.py", line 50, in set
await cache_instance.set(hashed_key, b_value, ex=expire_time)
File "/usr/local/lib/python3.12/site-packages/sentry_sdk/integrations/redis/_async_common.py", line 98, in _sentry_execute_command
value = await old_execute_command(self, name, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/client.py", line 518, in execute_command
return await conn.retry.call_with_retry(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/retry.py", line 59, in call_with_retry
return await do()
^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/client.py", line 492, in _send_command_parse_response
return await self.parse_response(conn, command_name, **options)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/client.py", line 539, in parse_response
response = await connection.read_response()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/connection.py", line 802, in read_response
await self.disconnect(nowait=True)
File "/usr/local/lib/python3.12/site-packages/redis/asyncio/connection.py", line 666, in disconnect
async with async_timeout(self.socket_connect_timeout):
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.12/asyncio/timeouts.py", line 145, in timeout
loop = events.get_running_loop()
^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: no running event loop

[danial29rus]

filter-engine-app | ValueError: <Token var=<ContextVar name='current_context' default={} at 0xffff95272cf0> at 0xffff75babe80> was created in a different Context
filter-engine-app | Failed to detach context
filter-engine-app | Traceback (most recent call last):
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/opentelemetry/instrumentation/asgi/init.py", line 631, in call
filter-engine-app | await self.app(scope, otel_receive, otel_send)
filter-engine-app | GeneratorExit
filter-engine-app |
filter-engine-app | During handling of the above exception, another exception occurred:
filter-engine-app |
filter-engine-app | Traceback (most recent call last):
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/opentelemetry/context/init.py", line 154, in detach
filter-engine-app | _RUNTIME_CONTEXT.detach(token)
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/opentelemetry/context/contextvars_context.py", line 50, in detach
filter-engine-app | self._current_context.reset(token) # type: ignore
filter-engine-app | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
filter-engine-app | ValueError: <Token var=<ContextVar name='current_context' default={} at 0xffff95272cf0> at 0xffff75b85440> was created in a different Context
filter-engine-app | [2025-02-03 09:56:47 +0000] 172.21.0.1 - "POST /api/v1/filters/vehicles/list/paginated HTTP/1.1" 500 51109.854
filter-engine-app | [ERROR] Application callable raised an exception
filter-engine-app | Traceback (most recent call last):
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/granian/_futures.py", line 4, in future_watcher
filter-engine-app | await inner(watcher.scope, watcher.proto)
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/granian/asgi.py", line 118, in _http_logger
filter-engine-app | rv = await _runner(scope, proto)
filter-engine-app | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/fastapi/applications.py", line 1054, in call
filter-engine-app | await super().call(scope, receive, send)
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/sentry_sdk/integrations/starlette.py", line 375, in _sentry_patched_asgi_app
filter-engine-app | return await middleware(scope, receive, send)
filter-engine-app | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/sentry_sdk/integrations/asgi.py", line 153, in _run_asgi3
filter-engine-app | return await self._run_app(scope, receive, send, asgi_version=3)
filter-engine-app | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/sentry_sdk/integrations/asgi.py", line 172, in _run_app
filter-engine-app | with sentry_sdk.isolation_scope() as sentry_scope:
filter-engine-app | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
filter-engine-app | File "/usr/local/lib/python3.12/contextlib.py", line 158, in exit
filter-engine-app | self.gen.throw(value)
filter-engine-app | File "/usr/local/lib/python3.12/site-packages/sentry_sdk/scope.py", line 1639, in isolation_scope
filter-engine-app | _current_scope.reset(current_token)
filter-engine-app | ValueError: <Token var=<ContextVar name='current_scope' default=None at 0xffff9351a980> at 0xffff75b84d40> was created in a different Context

[danial29rus]

i update from 1.6 to 1.7.6, set flag --task-impl [asyncio] and errors disappeared