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import typing
from collections.abc import AsyncGenerator
from logging import getLogger
import httpx
import pydantic
import pydantic_settings
from fastapi import Depends
from fastapi.templating import Jinja2Templates
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
log = getLogger(__name__)
class _Config(
pydantic_settings.BaseSettings,
env_prefix="backend_",
env_file=".env",
env_file_encoding="utf-8",
env_nested_delimiter="__",
extra="ignore",
):
"""General configuration settings for the service."""
debug: bool = False
git_sha: str = "development"
signing_key: pydantic.SecretStr
database_url: pydantic.SecretStr
super_admin_token: pydantic.SecretStr
printful_token: pydantic.SecretStr
app_prefix: str = ""
templates: Jinja2Templates = Jinja2Templates(directory="src/templates")
cors_origins: list[str] = []
CONFIG = _Config()
class Connections:
"""How to connect to other, internal services."""
DB_ENGINE = create_async_engine(CONFIG.database_url.get_secret_value(), echo=CONFIG.debug)
DB_SESSION_MAKER = async_sessionmaker(DB_ENGINE)
async def _get_printful_client() -> AsyncGenerator[httpx.AsyncClient, None]:
"""Yield an authenticated httpx client for printful, for use with a FastAPI dependency."""
client = httpx.AsyncClient(
headers={"Authorization": f"Bearer {CONFIG.printful_token.get_secret_value()}"},
base_url="https://api.printful.com",
)
async with client as c:
yield c
async def _get_db_session() -> AsyncGenerator[AsyncSession, None]:
"""Yield a database session, for use with a FastAPI dependency."""
async with Connections.DB_SESSION_MAKER() as session, session.begin():
yield session
DBSession = typing.Annotated[AsyncSession, Depends(_get_db_session)]
PrintfulClient = typing.Annotated[httpx.AsyncClient, Depends(_get_printful_client)]
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