Adjusted files for isort & autopep

Co-authored-by: vikbhas <waraa.vignesh@gmail.com>

creyPY/fastapi/db/__init__.py

@@ -1 +1,2 @@
 from .session import *  # noqa
+from .async_session import * # noqa

creyPY/fastapi/db/async_session.py

@@ -0,0 +1,31 @@
+import os
+from typing import AsyncGenerator
+from dotenv import load_dotenv
+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import sessionmaker
+
+
+load_dotenv()
+
+host = os.getenv("POSTGRES_HOST", "localhost")
+user = os.getenv("POSTGRES_USER", "postgres")
+password = os.getenv("POSTGRES_PASSWORD", "root")
+port = os.getenv("POSTGRES_PORT", "5432")
+name = os.getenv("POSTGRES_DB", "fastapi")
+
+SQLALCHEMY_DATABASE_URL = f"postgresql+psycopg://{user}:{password}@{host}:{port}/"
+
+
+async_engine = create_async_engine(SQLALCHEMY_DATABASE_URL + name, pool_pre_ping=True)
+AsyncSessionLocal = sessionmaker(
+    bind=async_engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autoflush=False,
+    autocommit=False,
+)
+
+
+async def get_async_db() -> AsyncGenerator[AsyncSession, None]:
+    async with AsyncSessionLocal() as db:
+        yield db

creyPY/fastapi/pagination.py

@@ -1,5 +1,6 @@
 from math import ceil
-from typing import Any, Generic, Optional, Self, Sequence, TypeVar, Union
+from typing import Any, Generic, Optional, Self, Sequence, TypeVar, Union, overload
+from contextlib import suppress
 from pydantic import BaseModel
 from fastapi_pagination import Params
 from fastapi_pagination.bases import AbstractPage, AbstractParams
@@ -8,6 +9,8 @@ from fastapi_pagination.types import (
     GreaterEqualZero,
     AdditionalData,
     SyncItemsTransformer,
+    AsyncItemsTransformer,
+    ItemsTransformer,
 )
 from fastapi_pagination.api import create_page, apply_items_transformer
 from fastapi_pagination.utils import verify_params
@@ -17,7 +20,9 @@ from pydantic.json_schema import SkipJsonSchema
 from sqlalchemy.sql.selectable import Select
 from sqlalchemy.orm.session import Session
 from sqlalchemy import select, func
+from sqlalchemy.ext.asyncio import AsyncSession, async_scoped_session
 from fastapi import Query
+from sqlalchemy.util import await_only, greenlet_spawn
 
 T = TypeVar("T")
 
@@ -108,14 +113,58 @@ def unwrap_scalars(
     return [item[0] if force_unwrap else item for item in items]
 
 
+def _get_sync_conn_from_async(conn: Any) -> Session:  # pragma: no cover
+    if isinstance(conn, async_scoped_session):
+        conn = conn()
+
+    with suppress(AttributeError):
+        return conn.sync_session  # type: ignore
+
+    with suppress(AttributeError):
+        return conn.sync_connection  # type: ignore
+
+    raise TypeError("conn must be an AsyncConnection or AsyncSession")
+
+
+@overload
 def paginate(
     connection: Session,
     query: Select,
     params: Optional[AbstractParams] = None,
     transformer: Optional[SyncItemsTransformer] = None,
     additional_data: Optional[AdditionalData] = None,
+) -> Any:
+    pass
+
+
+@overload
+async def paginate(
+    connection: AsyncSession,
+    query: Select,
+    params: Optional[AbstractParams] = None,
+    transformer: Optional[AsyncItemsTransformer] = None,
+    additional_data: Optional[AdditionalData] = None,
+) -> Any:
+    pass
+
+
+def _paginate(
+    connection: Session,
+    query: Select,
+    params: Optional[AbstractParams] = None,
+    transformer: Optional[ItemsTransformer] = None,
+    additional_data: Optional[AdditionalData] = None,
+    async_: bool = False,
 ):
 
+    if async_:
+
+        def _apply_items_transformer(*args: Any, **kwargs: Any) -> Any:
+            return await_only(apply_items_transformer(*args, **kwargs, async_=True))
+
+    else:
+        _apply_items_transformer = apply_items_transformer
+
     params, raw_params = verify_params(params, "limit-offset", "cursor")
     count_query = create_count_query(query)
     total = connection.scalar(count_query)
@@ -129,7 +178,7 @@ def paginate(
     items = connection.execute(query).all()
 
     items = unwrap_scalars(items)
-    t_items = apply_items_transformer(items, transformer)
+    t_items = _apply_items_transformer(items, transformer)
 
     return create_page(
         t_items,
@@ -137,3 +186,19 @@ def paginate(
         total=total,
         **(additional_data or {}),
     )
+
+
+def paginate(
+    connection: Session,
+    query: Select,
+    params: Optional[AbstractParams] = None,
+    transformer: Optional[ItemsTransformer] = None,
+    additional_data: Optional[AdditionalData] = None,
+):
+    if isinstance(connection, AsyncSession):
+        connection = _get_sync_conn_from_async(connection)
+        return greenlet_spawn(
+            _paginate, connection, query, params, transformer, additional_data, async_=True
+        )
+
+    return _paginate(connection, query, params, transformer, additional_data, async_=False)

requirements.txt

@@ -21,3 +21,6 @@ psycopg-pool>=3.2.2 # PostgreSQL
 h11>=0.14.0 # Testing
 httpcore>=1.0.5 # Testing
 httpx>=0.27.0 # Testing
+
+asyncpg>=0.30.0 #SQLAlchemy
+greenlet>=3.1.1 #Async