refactor: make postgresdb operations async

app/api/routers/user.py

@@ -1,13 +1,14 @@
-from typing import List
+import logging
 from fastapi import APIRouter, Depends, HTTPException
-from sqlalchemy.orm import Session
+from sqlalchemy.ext.asyncio import AsyncSession
 
-from app.engine.postgresdb import get_db
+from app.engine.postgresdb import get_db_session
 from app.schema.index import UserCreate, User as UserSchema
 from app.model.user import User as UserModel
 
 
 user_router = r = APIRouter(prefix="/api/v1/users", tags=["users"])
+logger = logging.getLogger(__name__)
 
 
 @r.post(
@@ -20,18 +21,15 @@ user_router = r = APIRouter(prefix="/api/v1/users", tags=["users"])
         500: {"description": "Internal server error"},
     },
 )
-async def create_user(user: UserCreate, db: Session = Depends(get_db)):
+async def create_user(user: UserCreate, db: AsyncSession = Depends(get_db_session)):
     try:
-        db_user = (
-            db.query(UserModel).filter(UserModel.email == user.email).sort_by(UserModel.updated_at, desc=True).first()
-        )
+        logger.info(f"Checking if user exists: {user.dict()}")
+        db_user = await UserModel.get(db, email=user.email)
         if db_user and not db_user.is_deleted:
             raise HTTPException(status_code=409, detail="User already exists")
 
-        db_user = UserModel(**user.dict())
-        db.add(db_user)
-        db.commit()
-        db.refresh(db_user)
+        logger.info(f"Creating user: {user.dict()}")
+        db_user = await UserModel.create(db, **user.dict())
         return db_user
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))
@@ -46,8 +44,8 @@ async def create_user(user: UserCreate, db: Session = Depends(get_db)):
         500: {"description": "Internal server error"},
     },
 )
-async def get_user(user_id: int, db: Session = Depends(get_db)):
-    user = db.query(UserModel).get(user_id)
+async def get_user(user_id: int, db: AsyncSession = Depends(get_db_session)):
+    user = await UserModel.get(db, id=user_id)
     if not user:
         raise HTTPException(status_code=404, detail="User not found")
     return user
@@ -62,14 +60,11 @@ async def get_user(user_id: int, db: Session = Depends(get_db)):
         500: {"description": "Internal server error"},
     },
 )
-async def update_user(user_id: int, user_payload: UserCreate, db: Session = Depends(get_db)):
-    user = db.query(UserModel).get(user_id)
+async def update_user(user_id: int, user_payload: UserCreate, db: AsyncSession = Depends(get_db_session)):
+    user = await UserModel.get(db, id=user_id)
     if not user:
         raise HTTPException(status_code=404, detail="User not found")
-    user.name = user_payload.name
-    user.email = user_payload.email
-    db.commit()
-    db.refresh(user)
+    user = await UserModel.update(db, id=user_id, **user_payload.dict())
     return user
 
 
@@ -82,11 +77,9 @@ async def update_user(user_id: int, user_payload: UserCreate, db: Session = Depe
         500: {"description": "Internal server error"},
     },
 )
-async def delete_user(user_id: int, db: Session = Depends(get_db)):
-    user = db.query(UserModel).get(user_id)
+async def delete_user(user_id: int, db: AsyncSession = Depends(get_db_session)):
+    user = await UserModel.get(db, id=user_id)
     if not user:
         raise HTTPException(status_code=404, detail="User not found")
-    user.is_deleted = True
-    db.commit()
-    db.refresh(user)
+    user = await UserModel.delete(db, id=user_id)
     return user

app/engine/postgresdb.py

@@ -1,35 +1,69 @@
-import os
 import logging
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker, declarative_base, Session
-from fastapi import Request
+import contextlib
+from typing import Any, AsyncIterator
 
-from dotenv import load_dotenv
+from sqlalchemy.ext.asyncio import (
+    AsyncConnection,
+    AsyncSession,
+    async_sessionmaker,
+    create_async_engine,
+)
+from sqlalchemy.orm import declarative_base
+
+from config.index import config as env
 
-load_dotenv()
 logger = logging.getLogger(__name__)
 
-SQLALCHEMY_DATABASE_URL = os.getenv("SQLALCHEMY_DATABASE_URL")
-assert SQLALCHEMY_DATABASE_URL, f"SQLALCHEMY_DATABASE_URL is not set"
-logger.info(f"SQLALCHEMY_DATABASE_URL: {SQLALCHEMY_DATABASE_URL}")
+Base = declarative_base()
 
-engine = create_engine(SQLALCHEMY_DATABASE_URL)
 
-SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+class PostgresDatabase:
 
-Base = declarative_base()
+    def __init__(self, host: str, engine_kwargs: dict[str, Any] = {}):
+        self._engine = create_async_engine(host, **engine_kwargs)
+        self._sessionmaker = async_sessionmaker(autocommit=False, bind=self._engine)
+
+    async def close(self):
+        if self._engine is None:
+            raise Exception("DatabaseSessionManager is not initialized")
+        await self._engine.dispose()
+
+        self._engine = None
+        self._sessionmaker = None
+
+    @contextlib.asynccontextmanager
+    async def connect(self) -> AsyncIterator[AsyncConnection]:
+        if self._engine is None:
+            raise Exception("DatabaseSessionManager is not initialized")
+
+        async with self._engine.begin() as connection:
+            try:
+                yield connection
+            except Exception:
+                await connection.rollback()
+                raise
+
+    @contextlib.asynccontextmanager
+    async def session(self) -> AsyncIterator[AsyncSession]:
+        if self._sessionmaker is None:
+            raise Exception("DatabaseSessionManager is not initialized")
+
+        session = self._sessionmaker()
+        try:
+            yield session
+        except Exception:
+            await session.rollback()
+            raise
+        finally:
+            await session.close()
+
+    def get_engine(self):
+        return self._engine
 
 
-# def get_db():
-#     session = SessionLocal()
-#     logger.info("Postgres Session created successfully!")
-#     try:
-#         yield session
-#     finally:
-#         session.close()
-#         logger.info("Postgres Session closed successfully!")
+postgresdb = PostgresDatabase(env.SQLALCHEMY_DATABASE_URL, {"echo": True, "future": True})
 
 
-# Dependency
-def get_db(request: Request):
-    return request.state.db
+async def get_db_session():
+    async with postgresdb.session() as session:
+        yield session

app/model/base.py

@@ -1,9 +1,10 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from sqlalchemy import Column, DateTime, Integer
 
 from app.engine.postgresdb import Base
 
-class BaseModel():
+
+class BaseModel:
     id = Column(Integer, primary_key=True, index=True)
-    created_at = Column(DateTime, default=datetime.now())
-    updated_at = Column(DateTime, default=datetime.now(), onupdate=datetime.now())
+    created_at = Column(DateTime, default=datetime.now(timezone.utc))
+    updated_at = Column(DateTime, default=datetime.now(timezone.utc), onupdate=datetime.now(timezone.utc))

app/model/transaction.py

@@ -1,16 +1,18 @@
-from sqlalchemy import Column, DateTime, Float, ForeignKey, Integer, String
-from sqlalchemy.orm import relationship
+from datetime import datetime
+from sqlalchemy import ForeignKey
+from sqlalchemy.orm import relationship, Mapped, mapped_column
 
 from app.model.base import BaseModel
 from app.engine.postgresdb import Base
 
+
 class Transaction(Base, BaseModel):
     __tablename__ = "transactions"
-    transaction_date = Column(DateTime)
-    category = Column(String)
-    name_description = Column(String)
-    amount = Column(Float)
-    type = Column(String)
+    transaction_date: Mapped[datetime]
+    category: Mapped[str]
+    name_description: Mapped[str]
+    amount: Mapped[float]
+    type: Mapped[str]
 
-    user_id = Column(Integer, ForeignKey("users.id"))
-    user = relationship("User", back_populates="transactions")
+    user_id = mapped_column(ForeignKey("users.id"))
+    user = relationship("User", back_populates="transactions")

app/model/user.py

@@ -1,5 +1,6 @@
-from sqlalchemy import Column, String, Boolean
-from sqlalchemy.orm import relationship
+from sqlalchemy.orm import relationship, Mapped, mapped_column
+from sqlalchemy.sql import expression as sql
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.model.base import BaseModel
 from app.engine.postgresdb import Base
@@ -8,9 +9,56 @@ from app.engine.postgresdb import Base
 class User(Base, BaseModel):
     __tablename__ = "users"
 
-    name = Column(String)
-    email = Column(String)
-    hashed_password = Column(String)
-    is_deleted = Column(Boolean, default=False)
+    name: Mapped[str]
+    email: Mapped[str]
+    hashed_password: Mapped[str]
+    is_deleted: Mapped[bool] = mapped_column(default=False)
 
     transactions = relationship("Transaction", back_populates="user")
+
+    @classmethod
+    async def create(cls: "type[User]", db: AsyncSession, **kwargs) -> "User":
+        query = sql.insert(cls).values(**kwargs).returning(cls.id)
+        users = await db.execute(query)
+        await db.commit()
+        return users.first()
+
+    @classmethod
+    async def update(cls: "type[User]", db: AsyncSession, id: int, **kwargs) -> "User":
+        query = (
+            sql.update(cls)
+            .where(cls.id == id)
+            .values(**kwargs)
+            .execution_options(synchronize_session="fetch")
+            .returning(cls.id)
+        )
+        users = await db.execute(query)
+        await db.commit()
+        return users.first()
+
+    @classmethod
+    async def get(cls: "type[User]", db: AsyncSession, id: int) -> "User":
+        query = sql.select(cls).where(cls.id == id)
+        users = await db.execute(query)
+        (user,) = users.first()
+        return user
+
+    @classmethod
+    async def get(cls: "type[User]", db: AsyncSession, email: str) -> "User":
+        query = sql.select(cls).where(cls.email == email)
+        users = await db.execute(query)
+        (user,) = users.first()
+        return user
+
+    @classmethod
+    async def delete(cls: "type[User]", db: AsyncSession, id: int) -> "User":
+        query = (
+            sql.update(cls)
+            .where(cls.id == id)
+            .values(is_deleted=True)
+            .execution_options(synchronize_session="fetch")
+            .returning(cls.id)
+        )
+        users = await db.execute(query)
+        await db.commit()
+        return users.first()

app/schema/index.py

@@ -21,7 +21,7 @@ class User(BaseModel):
     email: str
     hashed_password: str
     is_deleted: bool = False
-    transactions: "List[Transaction]"
+    transactions: "List[Transaction]" = []
 
 
 class Transaction(BaseModel):

config/index.py

@@ -0,0 +1,34 @@
+import os
+from dotenv import load_dotenv
+
+load_dotenv()
+
+
+class Config:
+    DEBUG = os.getenv("DEBUG", False)
+    SQLALCHEMY_DATABASE_URI = os.getenv("SQLALCHEMY_DATABASE_URI")
+    SQLALCHEMY_TRACK_MODIFICATIONS = os.getenv("SQLALCHEMY_TRACK_MODIFICATIONS", False)
+    ENVIRONMENT = os.getenv("ENVIRONMENT", "dev")
+    APP_HOST = os.getenv("APP_HOST", "0.0.0.0")
+    APP_PORT = int(os.getenv("APP_PORT", "8000"))
+    PINECONE_API_KEY = os.getenv("PINECONE_API_KEY")
+    PINECONE_INDEX_NAME = os.getenv("PINECONE_INDEX_NAME")
+    PINECONE_ENVIRONMENT = os.getenv("PINECONE_ENVIRONMENT")
+    OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
+    OPENAI_ORGANIZATION = os.getenv("OPENAI_ORGANIZATION")
+    MODEL = os.getenv("MODEL", "gpt-3.5-turbo")
+    EMBEDDING_MODEL = os.getenv("EMBEDDING_MODEL", "text-embedding-ada-002")
+    EMBEDDING_DIM = os.getenv("EMBEDDING_DIM", "1536")
+    CHUNK_SIZE = int(os.getenv("CHUNK_SIZE", "1024"))
+    CHUNK_OVERLAP = int(os.getenv("CHUNK_OVERLAP", "20"))
+    MAX_TOKENS = int(os.getenv("MAX_TOKENS", "4000"))
+
+    POSTGRES_USER = os.getenv("POSTGRES_USER")
+    POSTGRES_PASSWORD = os.getenv("POSTGRES_PASSWORD")
+    POSTGRES_DB_NAME = os.getenv("POSTGRES_DB_NAME")
+    POSTGRES_DB_HOST = os.getenv("POSTGRES_DB_HOST")
+    POSTGRES_DB_PORT = os.getenv("POSTGRES_DB_PORT")
+    SQLALCHEMY_DATABASE_URL = f"postgresql+asyncpg://{POSTGRES_USER}:{POSTGRES_PASSWORD}@{POSTGRES_DB_HOST}:{POSTGRES_DB_PORT}/{POSTGRES_DB_NAME}"
+
+
+config = Config

main.py

@@ -1,89 +1,76 @@
-from dotenv import load_dotenv
-
-load_dotenv()
-
 import logging
 import os
 import uvicorn
 from contextlib import asynccontextmanager
-from fastapi import FastAPI, Request, Response
+from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import RedirectResponse
 from app.api.routers.chat import chat_router
 from app.api.routers.user import user_router
 from app.settings import init_settings
-from app.observability import init_observability
 from fastapi.staticfiles import StaticFiles
 from alembic.config import Config
 from alembic import command
 
 
-from app.engine.postgresdb import engine, Base, SessionLocal
+from app.engine.postgresdb import postgresdb
+from config.index import config
 
 logger = logging.getLogger("uvicorn")
 
-# Create all tables in the database
-Base.metadata.create_all(bind=engine)
 
+def run_migrations(connection, cfg):
+    cfg.attributes["connection"] = connection
+    command.upgrade(cfg, "head")
+
+
+async def run_async_migrations():
+    logger.info("Running migrations...")
+    async_engine = postgresdb.get_engine()
 
-def run_migrations():
-    alembic_cfg = Config("alembic.ini")
-    command.upgrade(alembic_cfg, "head")
+    async with async_engine.begin() as conn:
+        await conn.run_sync(run_migrations, Config("alembic.ini"))
+
+    logger.info("Finished running migrations")
 
 
 @asynccontextmanager
 async def lifespan(app_: FastAPI):
-    logger.info("Starting up...")
-    logger.info("Run 'alembic upgrade head' to apply migrations...")
-    run_migrations()
     yield
-    logger.info("Shutting down...")
+    if postgresdb.get_engine() is not None:
+        await postgresdb.close()
 
 
-app = FastAPI(lifespan=lifespan)
+init_settings()
+# init_observability()
 
 
-@app.middleware("http")
-async def db_session_middleware(request: Request, call_next):
-    response = Response("Internal server error", status_code=500)
-    try:
-        request.state.db = SessionLocal()
-        response = await call_next(request)
-    finally:
-        request.state.db.close()
-    return response
+def init_app():
+    app = FastAPI(lifespan=lifespan)
+    if config.ENVIRONMENT == "dev":
+        logger.warning("Running in development mode - allowing CORS for all origins")
+        app.add_middleware(
+            CORSMiddleware,
+            allow_origins=["*"],
+            allow_credentials=True,
+            allow_methods=["*"],
+            allow_headers=["*"],
+        )
 
+    if os.path.exists("data"):
+        app.mount("/api/data", StaticFiles(directory="data"), name="static")
+    app.include_router(chat_router, prefix="/api/chat")
+    app.include_router(user_router)
 
-init_settings()
-init_observability()
+    return app
 
-environment = os.getenv("ENVIRONMENT", "dev")  # Default to 'development' if not set
 
-if environment == "dev":
-    logger.warning("Running in development mode - allowing CORS for all origins")
-    app.add_middleware(
-        CORSMiddleware,
-        allow_origins=["*"],
-        allow_credentials=True,
-        allow_methods=["*"],
-        allow_headers=["*"],
-    )
+app = init_app()
 
+if __name__ == "__main__":
     # Redirect to documentation page when accessing base URL
     @app.get("/")
     async def redirect_to_docs():
         return RedirectResponse(url="/docs")
 
-
-if os.path.exists("data"):
-    app.mount("/api/data", StaticFiles(directory="data"), name="static")
-app.include_router(chat_router, prefix="/api/chat")
-app.include_router(user_router)
-
-
-if __name__ == "__main__":
-    app_host = os.getenv("APP_HOST", "0.0.0.0")
-    app_port = int(os.getenv("APP_PORT", "8000"))
-    reload = True if environment == "dev" else False
-
-    uvicorn.run(app="main:app", host=app_host, port=app_port, reload=reload)
+    uvicorn.run(app="main:app", host=config.APP_HOST, port=config.APP_PORT, reload=(config.ENVIRONMENT == "dev"))

migration/env.py

@@ -1,21 +1,20 @@
-import os
+import asyncio
 from logging.config import fileConfig
 
 from app.engine.postgresdb import Base
-from sqlalchemy import engine_from_config
+from sqlalchemy import engine_from_config, Connection
 from sqlalchemy import pool
+from sqlalchemy.ext.asyncio import AsyncEngine, async_engine_from_config
 
-from alembic import context
-
-from dotenv import load_dotenv
+from config.index import config as env
 
-load_dotenv()
+from alembic import context
 
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
 config = context.config
 
-config.set_main_option("sqlalchemy.url", os.getenv("SQLALCHEMY_DATABASE_URL"))
+config.set_main_option("sqlalchemy.url", env.SQLALCHEMY_DATABASE_URL)
 
 # Interpret the config file for Python logging.
 # This line sets up loggers basically.
@@ -37,17 +36,14 @@ target_metadata = Base.metadata
 # ... etc.
 
 
-def run_migrations_offline() -> None:
+def run_migrations_offline():
     """Run migrations in 'offline' mode.
-
     This configures the context with just a URL
     and not an Engine, though an Engine is acceptable
     here as well.  By skipping the Engine creation
     we don't even need a DBAPI to be available.
-
     Calls to context.execute() here emit the given string to the
     script output.
-
     """
     url = config.get_main_option("sqlalchemy.url")
     context.configure(
@@ -61,29 +57,33 @@ def run_migrations_offline() -> None:
         context.run_migrations()
 
 
-def run_migrations_online() -> None:
-    """Run migrations in 'online' mode.
+def do_run_migrations(connection: Connection) -> None:
+    context.configure(connection=connection, target_metadata=target_metadata)
 
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_migrations_online():
+    """Run migrations in 'online' mode.
     In this scenario we need to create an Engine
     and associate a connection with the context.
-
     """
-    connectable = engine_from_config(
-        config.get_section(config.config_ini_section, {}),
+    configuration = config.get_section(config.config_ini_section)
+    configuration["sqlalchemy.url"] = env.SQLALCHEMY_DATABASE_URL
+    connectable = async_engine_from_config(
+        configuration,
         prefix="sqlalchemy.",
         poolclass=pool.NullPool,
     )
 
-    with connectable.connect() as connection:
-        context.configure(
-            connection=connection, target_metadata=target_metadata, compare_type=True
-        )
+    async with connectable.connect() as connection:
+        await connection.run_sync(do_run_migrations)
 
-        with context.begin_transaction():
-            context.run_migrations()
+    await connectable.dispose()
 
 
 if context.is_offline_mode():
     run_migrations_offline()
 else:
-    run_migrations_online()
+    asyncio.run(run_migrations_online())

poetry.lock

@@ -198,6 +198,87 @@ doc = ["Sphinx (>=7)", "packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphin
 test = ["anyio[trio]", "coverage[toml] (>=7)", "exceptiongroup (>=1.2.0)", "hypothesis (>=4.0)", "psutil (>=5.9)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (>=0.17)"]
 trio = ["trio (>=0.23)"]
 
+[[package]]
+name = "async-timeout"
+version = "4.0.3"
+description = "Timeout context manager for asyncio programs"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "async-timeout-4.0.3.tar.gz", hash = "sha256:4640d96be84d82d02ed59ea2b7105a0f7b33abe8703703cd0ab0bf87c427522f"},
+    {file = "async_timeout-4.0.3-py3-none-any.whl", hash = "sha256:7405140ff1230c310e51dc27b3145b9092d659ce68ff733fb0cefe3ee42be028"},
+]
+
+[[package]]
+name = "asyncio"
+version = "3.4.3"
+description = "reference implementation of PEP 3156"
+optional = false
+python-versions = "*"
+files = [
+    {file = "asyncio-3.4.3-cp33-none-win32.whl", hash = "sha256:b62c9157d36187eca799c378e572c969f0da87cd5fc42ca372d92cdb06e7e1de"},
+    {file = "asyncio-3.4.3-cp33-none-win_amd64.whl", hash = "sha256:c46a87b48213d7464f22d9a497b9eef8c1928b68320a2fa94240f969f6fec08c"},
+    {file = "asyncio-3.4.3-py3-none-any.whl", hash = "sha256:c4d18b22701821de07bd6aea8b53d21449ec0ec5680645e5317062ea21817d2d"},
+    {file = "asyncio-3.4.3.tar.gz", hash = "sha256:83360ff8bc97980e4ff25c964c7bd3923d333d177aa4f7fb736b019f26c7cb41"},
+]
+
+[[package]]
+name = "asyncpg"
+version = "0.29.0"
+description = "An asyncio PostgreSQL driver"
+optional = false
+python-versions = ">=3.8.0"
+files = [
+    {file = "asyncpg-0.29.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:72fd0ef9f00aeed37179c62282a3d14262dbbafb74ec0ba16e1b1864d8a12169"},
+    {file = "asyncpg-0.29.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:52e8f8f9ff6e21f9b39ca9f8e3e33a5fcdceaf5667a8c5c32bee158e313be385"},
+    {file = "asyncpg-0.29.0-cp310-cp310-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:a9e6823a7012be8b68301342ba33b4740e5a166f6bbda0aee32bc01638491a22"},
+    {file = "asyncpg-0.29.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:746e80d83ad5d5464cfbf94315eb6744222ab00aa4e522b704322fb182b83610"},
+    {file = "asyncpg-0.29.0-cp310-cp310-musllinux_1_1_aarch64.whl", hash = "sha256:ff8e8109cd6a46ff852a5e6bab8b0a047d7ea42fcb7ca5ae6eaae97d8eacf397"},
+    {file = "asyncpg-0.29.0-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:97eb024685b1d7e72b1972863de527c11ff87960837919dac6e34754768098eb"},
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-]
-
 [[package]]
 name = "pydantic"
 version = "2.7.2"
@@ -4210,4 +4210,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "jaraco.test", "more
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11,<3.12"
-content-hash = "527fd744fa60d7638490e59133486e40e1a5303635e9f0fd7286ce5ec97ad4d1"
+content-hash = "ea7579f435b0c476a57fe23453277a8e90d2815e0a86efc7ff300a5ddbd434bb"

pyproject.toml

@@ -28,11 +28,12 @@ pydantic = "^2.7.2"
 dateparser = "^1.2.0"
 pandas = "^2.2.2"
 path = "^16.14.0"
-psycopg2-binary = "^2.9.9"
 pytest-xdist = "^3.6.1"
 pytest-asyncio = "^0.23.7"
 httpx = "^0.27.0"
 alembic = "^1.13.1"
+asyncpg = "^0.29.0"
+asyncio = "^3.4.3"
 
 [tool.poetry.dependencies.uvicorn]
 extras = [ "standard" ]