Library seems incompatible with asyncpg

[brassy-endomorph]

A slightly modified version of the code from the README cannot make DB queries in a request handler.

Code:

from flask import Flask
from flask_sqlalchemy_lite import SQLAlchemy
from sqlalchemy import select
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column


class Base(DeclarativeBase):
    pass


class User(Base):
    __tablename__ = "user"
    id: Mapped[int] = mapped_column(primary_key=True)
    username: Mapped[str] = mapped_column(unique=True)


app = Flask(__name__)
app.config["SQLALCHEMY_ENGINES"] = {"default": "postgresql+psycopg://postgres:postgres@127.0.0.1:5432/postgres"}
app.config["SQLALCHEMY_ASYNC_ENGINES"] = {"default": "postgresql+asyncpg://postgres:postgres@127.0.0.1:5432/postgres"}
db = SQLAlchemy(app)

with app.app_context():
    Base.metadata.create_all(db.engine)
    db.session.add(User(username="example"))
    db.session.commit()


@app.route('/')
async def index():
    return await db.async_session.scalars(select(User))

Traceback (most recent call last):
  File "/tmp/wat/.venv/lib/python3.13/site-packages/werkzeug/serving.py", line 370, in run_wsgi
    execute(self.server.app)
    ~~~~~~~^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/werkzeug/serving.py", line 331, in execute
    application_iter = app(environ, start_response)
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask/app.py", line 1536, in __call__
    return self.wsgi_app(environ, start_response)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask/app.py", line 1527, in wsgi_app
    ctx.pop(error)
    ~~~~~~~^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask/ctx.py", line 426, in pop
    app_ctx.pop(exc)
    ~~~~~~~~~~~^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask/ctx.py", line 262, in pop
    self.app.do_teardown_appcontext(exc)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask/app.py", line 1382, in do_teardown_appcontext
    self.ensure_sync(func)(exc)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^
  File "/home/user/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/concurrent/futures/_base.py", line 449, in result
    return self.__get_result()
           ~~~~~~~~~~~~~~~~~^^
  File "/home/user/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_result
    raise self._exception
  File "/tmp/wat/.venv/lib/python3.13/site-packages/flask_sqlalchemy_lite/_extension.py", line 265, in _close_async_sessions
    await session.close()
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/ext/asyncio/session.py", line 1030, in close
    await greenlet_spawn(self.sync_session.close)
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 201, in greenlet_spawn
    result = context.throw(*sys.exc_info())
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/orm/session.py", line 2521, in close
    self._close_impl(invalidate=False)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/orm/session.py", line 2590, in _close_impl
    transaction.close(invalidate)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "<string>", line 2, in close
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/orm/state_changes.py", line 139, in _go
    ret_value = fn(self, *arg, **kw)
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/orm/session.py", line 1419, in close
    transaction.close()
    ~~~~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 2585, in close
    self._do_close()
    ~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 2723, in _do_close
    self._close_impl()
    ~~~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 2709, in _close_impl
    self._connection_rollback_impl()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 2701, in _connection_rollback_impl
    self.connection._rollback_impl()
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 1126, in _rollback_impl
    self._handle_dbapi_exception(e, None, None, None, None)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 2354, in _handle_dbapi_exception
    raise exc_info[1].with_traceback(exc_info[2])
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/base.py", line 1124, in _rollback_impl
    self.engine.dialect.do_rollback(self.connection)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/engine/default.py", line 703, in do_rollback
    dbapi_connection.rollback()
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/dialects/postgresql/asyncpg.py", line 882, in rollback
    self._handle_exception(error)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/dialects/postgresql/asyncpg.py", line 794, in _handle_exception
    raise error
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/dialects/postgresql/asyncpg.py", line 876, in rollback
    self.await_(self._rollback_and_discard())
    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 132, in await_only
    return current.parent.switch(awaitable)  # type: ignore[no-any-return,attr-defined] # noqa: E501
           ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/util/_concurrency_py3k.py", line 196, in greenlet_spawn
    value = await result
            ^^^^^^^^^^^^
  File "/tmp/wat/.venv/lib/python3.13/site-packages/sqlalchemy/dialects/postgresql/asyncpg.py", line 857, in _rollback_and_discard
    await self._transaction.rollback()
  File "/tmp/wat/.venv/lib/python3.13/site-packages/asyncpg/transaction.py", line 227, in rollback
    await self.__rollback()
  File "/tmp/wat/.venv/lib/python3.13/site-packages/asyncpg/transaction.py", line 206, in __rollback
    await self._connection.execute(query)
  File "/tmp/wat/.venv/lib/python3.13/site-packages/asyncpg/connection.py", line 349, in execute
    result = await self._protocol.query(query, timeout)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "asyncpg/protocol/protocol.pyx", line 375, in query
RuntimeError: Task <Task pending name='Task-4' coro=<AsyncToSync.__call__.<locals>.new_loop_wrap() running at /tmp/wat/.venv/lib/python3.13/site-packages/asgiref/sync.py:230> cb=[_run_until_complete_cb() at /home/user/.local/share/uv/python/cpython-3.13.5-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py:181]> got Future <Future pending cb=[BaseProtocol._on_waiter_completed()]> attached to a different loop

Python version 3.13.5

pyproject.toml contents:

[project]
name = "wat"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.13"
dependencies = [
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    "flask>=3.1.1",
    "flask-sqlalchemy-lite>=0.1.0",
    "psycopg[binary]>=3.2.9",
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]

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[davidism]

It seems like this might be an interaction with asgiref or SQLAlchemy's use of greenlet. I don't believe Flask-SQLAlchemy-Lite has any control over this, or is doing anything to affect it. Flask uses asgiref to run coroutines in the background, since it is a sync WSGI framework.

I don't personally use async, so I can't say why this isn't working beyond that. I'm happy to review a PR if you can fix it here, but it's likely a problem somewhere in the sqlalchemy/greenlet/asyncpg/asgiref interactions.

[davidism]

I think this is due to Flask's use of asgiref, since every async callback runs it its own loop, but certain objects like asyncpg hold a reference to the original loop. Flask would need some way to run an entire context in a single loop, which is a huge task that would require reimplementing our async handling.

You should see/request if it's possible for asyncpg/sqlalchemy/greenlet to not hold a reference to the loop. That's much more likely to happen on any reasonable timescale than rewriting Flask's async handling.

Alternatively, use Quart, ASGI will be much better at this than WSGI.

[brassy-endomorph]

Thanks for the answer. I suspected something like this was happening but didn't know enough of where to start looking to really be able to sort it out. Since this seems like "not a bug" I wouldn't object to it being moved to a discussion rather than an issue since others might find it helpful as I've seen similar issues with Flask / SqlA while trying to debug this.