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feat: Use Alembic with async driver (#6258)

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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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4
pyproject.toml
View file

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

44
src/backend/base/langflow/alembic/env.py
View file

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

42
src/backend/base/langflow/services/database/service.py
View file

@ -14,7 +14,7 @@ import sqlalchemy as sa
from alembic import command, util from alembic import command, util
from alembic.config import Config from alembic.config import Config
from loguru import logger 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.dialects import sqlite as dialect_sqlite
from sqlalchemy.engine import Engine from sqlalchemy.engine import Engine
from sqlalchemy.exc import OperationalError from sqlalchemy.exc import OperationalError
@ -81,12 +81,23 @@ class DatabaseService(Service):
self.engine = self._create_engine() self.engine = self._create_engine()
def _sanitize_database_url(self): def _sanitize_database_url(self):
if self.database_url.startswith("postgres://"): """Create the engine for the database."""
self.database_url = self.database_url.replace("postgres://", "postgresql://") url_components = self.database_url.split("://", maxsplit=1)
logger.warning(
"Fixed postgres dialect in database URL. Replacing postgres:// with postgresql://. " driver = url_components[0]
"To avoid this warning, update the database URL."
) 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): def _build_connection_kwargs(self):
"""Build connection kwargs by merging deprecated settings with db_connection_settings. """Build connection kwargs by merging deprecated settings with db_connection_settings.
@ -109,28 +120,13 @@ class DatabaseService(Service):
return connection_kwargs return connection_kwargs
def _create_engine(self) -> AsyncEngine: 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 # Get connection settings from config, with defaults if not specified
# if the user specifies an empty dict, we allow it. # if the user specifies an empty dict, we allow it.
kwargs = self._build_connection_kwargs() 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( return create_async_engine(
database_url, self.database_url,
connect_args=self._get_connect_args(), connect_args=self._get_connect_args(),
poolclass=pool,
**kwargs, **kwargs,
) )

5
src/backend/base/langflow/services/settings/base.py
View file

@ -70,7 +70,10 @@ class Settings(BaseSettings):
dev: bool = False dev: bool = False
"""If True, Langflow will run in development mode.""" """If True, Langflow will run in development mode."""
database_url: str | None = None 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 database_connection_retry: bool = False
"""If True, Langflow will retry to connect to the database if it fails.""" """If True, Langflow will retry to connect to the database if it fails."""
pool_size: int = 10 pool_size: int = 10

6
src/backend/tests/conftest.py
View file

@ -75,6 +75,12 @@ def blockbuster(request):
.can_block_in("langchain_core/_api/internal.py", "is_caller_internal") .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"] bb.functions["os.path.abspath"]
.can_block_in("loguru/_better_exceptions.py", {"_get_lib_dirs", "_format_exception"}) .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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version = "1.5.8" version = "1.5.18"
source = { registry = "https://pypi.org/simple" } source = { registry = "https://pypi.org/simple" }
dependencies = [ dependencies = [
{ name = "forbiddenfruit" }, { name = "forbiddenfruit" },
] ]
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wheels = [ wheels = [
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[[package]] [[package]]
@ -4051,7 +4051,7 @@ requires-dist = [
{ name = "scrapegraph-py", specifier = ">=1.10.2" }, { name = "scrapegraph-py", specifier = ">=1.10.2" },
{ name = "sentence-transformers", marker = "extra == 'local'", specifier = ">=2.3.1" }, { name = "sentence-transformers", marker = "extra == 'local'", specifier = ">=2.3.1" },
{ name = "spider-client", specifier = "==0.1.24" }, { 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 = "sseclient-py", specifier = "==1.8.0" },
{ name = "supabase", specifier = "==2.6.0" }, { name = "supabase", specifier = "==2.6.0" },
{ name = "types-cachetools", specifier = "==5.5.0.20240820" }, { name = "types-cachetools", specifier = "==5.5.0.20240820" },
@ -4068,7 +4068,7 @@ requires-dist = [
[package.metadata.requires-dev] [package.metadata.requires-dev]
dev = [ dev = [
{ name = "asgi-lifespan", specifier = ">=2.1.0" }, { name = "asgi-lifespan", specifier = ">=2.1.0" },
{ name = "blockbuster", specifier = ">=1.5.8,<1.6" }, { name = "blockbuster", specifier = ">=1.5.18,<1.6" },
{ name = "codeflash", specifier = ">=0.8.4" }, { name = "codeflash", specifier = ">=0.8.4" },
{ name = "dictdiffer", specifier = ">=0.9.0" }, { name = "dictdiffer", specifier = ">=0.9.0" },
{ name = "httpx", specifier = ">=0.27.0" }, { name = "httpx", specifier = ">=0.27.0" },
@ -5239,6 +5239,7 @@ name = "nvidia-nccl-cu12"
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[package.optional-dependencies] [package.optional-dependencies]