feat: Use Alembic with async driver (#6258)

Use Alembic with async driver
This commit is contained in:
Christophe Bornet 2025-02-12 00:11:55 +01:00 committed by GitHub
commit ffbc97bfc9
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6 changed files with 95 additions and 74 deletions

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@ -97,7 +97,7 @@ dependencies = [
"langchain-ollama==0.2.1",
"langchain-sambanova==0.1.0",
"langchain-community~=0.3.10",
"sqlalchemy[aiosqlite,postgresql_psycopg2binary,postgresql_psycopgbinary]>=2.0.36,<3.0.0",
"sqlalchemy[aiosqlite,postgresql_psycopg2binary,postgresql_psycopgbinary]>=2.0.38,<3.0.0",
"atlassian-python-api==3.41.16",
"mem0ai==0.1.34",
"needle-python>=0.4.0",
@ -186,7 +186,7 @@ dev-dependencies = [
"asgi-lifespan>=2.1.0",
"pytest-github-actions-annotate-failures>=0.2.0",
"pytest-codspeed>=3.0.0",
"blockbuster>=1.5.8,<1.6",
"blockbuster>=1.5.18,<1.6",
"types-aiofiles>=24.1.0.20240626",
"codeflash>=0.8.4",
"hypothesis>=6.123.17",

View file

@ -1,9 +1,11 @@
# noqa: INP001
import asyncio
from logging.config import fileConfig
from alembic import context
from sqlalchemy import engine_from_config, pool, text
from sqlalchemy import pool, text
from sqlalchemy.event import listen
from sqlalchemy.ext.asyncio import async_engine_from_config
from langflow.services.database.service import SQLModel
@ -68,14 +70,18 @@ def _sqlite_do_begin(conn):
conn.exec_driver_sql("BEGIN EXCLUSIVE")
def run_migrations_online() -> None:
"""Run migrations in 'online' mode.
def _do_run_migrations(connection):
context.configure(connection=connection, target_metadata=target_metadata, render_as_batch=True)
In this scenario we need to create an Engine
and associate a connection with the context.
with context.begin_transaction():
if connection.dialect.name == "postgresql":
connection.execute(text("SET LOCAL lock_timeout = '60s';"))
connection.execute(text("SELECT pg_advisory_xact_lock(112233);"))
context.run_migrations()
"""
connectable = engine_from_config(
async def _run_async_migrations() -> None:
connectable = async_engine_from_config(
config.get_section(config.config_ini_section, {}),
prefix="sqlalchemy.",
poolclass=pool.NullPool,
@ -83,17 +89,23 @@ def run_migrations_online() -> None:
if connectable.dialect.name == "sqlite":
# See https://docs.sqlalchemy.org/en/20/dialects/sqlite.html#serializable-isolation-savepoints-transactional-ddl
listen(connectable, "connect", _sqlite_do_connect)
listen(connectable, "begin", _sqlite_do_begin)
listen(connectable.sync_engine, "connect", _sqlite_do_connect)
listen(connectable.sync_engine, "begin", _sqlite_do_begin)
with connectable.connect() as connection:
context.configure(connection=connection, target_metadata=target_metadata, render_as_batch=True)
async with connectable.connect() as connection:
await connection.run_sync(_do_run_migrations)
with context.begin_transaction():
if connection.dialect.name == "postgresql":
connection.execute(text("SET LOCAL lock_timeout = '60s';"))
connection.execute(text("SELECT pg_advisory_xact_lock(112233);"))
context.run_migrations()
await connectable.dispose()
def run_migrations_online() -> None:
"""Run migrations in 'online' mode.
In this scenario we need to create an Engine
and associate a connection with the context.
"""
asyncio.run(_run_async_migrations())
if context.is_offline_mode():

View file

@ -14,7 +14,7 @@ import sqlalchemy as sa
from alembic import command, util
from alembic.config import Config
from loguru import logger
from sqlalchemy import AsyncAdaptedQueuePool, event, exc, inspect
from sqlalchemy import event, exc, inspect
from sqlalchemy.dialects import sqlite as dialect_sqlite
from sqlalchemy.engine import Engine
from sqlalchemy.exc import OperationalError
@ -81,12 +81,23 @@ class DatabaseService(Service):
self.engine = self._create_engine()
def _sanitize_database_url(self):
if self.database_url.startswith("postgres://"):
self.database_url = self.database_url.replace("postgres://", "postgresql://")
logger.warning(
"Fixed postgres dialect in database URL. Replacing postgres:// with postgresql://. "
"To avoid this warning, update the database URL."
)
"""Create the engine for the database."""
url_components = self.database_url.split("://", maxsplit=1)
driver = url_components[0]
if driver == "sqlite":
driver = "sqlite+aiosqlite"
elif driver in {"postgresql", "postgres"}:
if driver == "postgres":
logger.warning(
"The postgres dialect in the database URL is deprecated. "
"Use postgresql instead. "
"To avoid this warning, update the database URL."
)
driver = "postgresql+psycopg"
self.database_url = f"{driver}://{url_components[1]}"
def _build_connection_kwargs(self):
"""Build connection kwargs by merging deprecated settings with db_connection_settings.
@ -109,28 +120,13 @@ class DatabaseService(Service):
return connection_kwargs
def _create_engine(self) -> AsyncEngine:
"""Create the engine for the database."""
url_components = self.database_url.split("://", maxsplit=1)
# Get connection settings from config, with defaults if not specified
# if the user specifies an empty dict, we allow it.
kwargs = self._build_connection_kwargs()
if url_components[0].startswith("sqlite"):
scheme = "sqlite+aiosqlite"
# Even though the docs say this is the default, it raises an error
# if we don't specify it.
# https://docs.sqlalchemy.org/en/20/errors.html#pool-class-cannot-be-used-with-asyncio-engine-or-vice-versa
pool = AsyncAdaptedQueuePool
else:
scheme = "postgresql+psycopg" if url_components[0].startswith("postgresql") else url_components[0]
pool = None
database_url = f"{scheme}://{url_components[1]}"
return create_async_engine(
database_url,
self.database_url,
connect_args=self._get_connect_args(),
poolclass=pool,
**kwargs,
)

View file

@ -70,7 +70,10 @@ class Settings(BaseSettings):
dev: bool = False
"""If True, Langflow will run in development mode."""
database_url: str | None = None
"""Database URL for Langflow. If not provided, Langflow will use a SQLite database."""
"""Database URL for Langflow. If not provided, Langflow will use a SQLite database.
The driver shall be an async one like `sqlite+aiosqlite` (`sqlite` and `postgresql`
will be automatically converted to the async drivers `sqlite+aiosqlite` and
`postgresql+psycopg` respectively)."""
database_connection_retry: bool = False
"""If True, Langflow will retry to connect to the database if it fails."""
pool_size: int = 10

View file

@ -75,6 +75,12 @@ def blockbuster(request):
.can_block_in("langchain_core/_api/internal.py", "is_caller_internal")
)
for func in ["os.stat", "os.path.abspath", "os.scandir"]:
bb.functions[func].can_block_in("alembic/util/pyfiles.py", "load_python_file")
for func in ["os.path.abspath", "os.scandir"]:
bb.functions[func].can_block_in("alembic/script/base.py", "_load_revisions")
(
bb.functions["os.path.abspath"]
.can_block_in("loguru/_better_exceptions.py", {"_get_lib_dirs", "_format_exception"})

68
uv.lock generated
View file

@ -523,14 +523,14 @@ wheels = [
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@ -4051,7 +4051,7 @@ requires-dist = [
{ name = "scrapegraph-py", specifier = ">=1.10.2" },
{ name = "sentence-transformers", marker = "extra == 'local'", specifier = ">=2.3.1" },
{ name = "spider-client", specifier = "==0.1.24" },
{ name = "sqlalchemy", extras = ["aiosqlite", "postgresql-psycopg2binary", "postgresql-psycopgbinary"], specifier = ">=2.0.36,<3.0.0" },
{ name = "sqlalchemy", extras = ["aiosqlite", "postgresql-psycopg2binary", "postgresql-psycopgbinary"], specifier = ">=2.0.38,<3.0.0" },
{ name = "sseclient-py", specifier = "==1.8.0" },
{ name = "supabase", specifier = "==2.6.0" },
{ name = "types-cachetools", specifier = "==5.5.0.20240820" },
@ -4068,7 +4068,7 @@ requires-dist = [
[package.metadata.requires-dev]
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{ name = "dictdiffer", specifier = ">=0.9.0" },
{ name = "httpx", specifier = ">=0.27.0" },
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