FastAPI Boilerplate

Features

• Async SQLAlchemy session
• Custom user class
• Top-level dependency
• Dependencies for specific permissions
• Celery
• Dockerize(Hot reload)
• Event dispatcher
• Cache

SQLAlchemy for asyncio context

from core.db import Transactional, session


@Transactional()
async def create_user(self):
    session.add(User(email="[email protected]"))

Do not use explicit commit(). Transactional class automatically do.

Standalone session

According to the current settings, the session is set through middleware.

However, it doesn't go through middleware in tests or background tasks.

So you need to use the @create_session decorator.

from core.db import create_session


@create_session
def test_something():
    ...

Custom user for authentication

from fastapi import Request


@home_router.get("/")
def home(request: Request):
    return request.user.id

Note. you have to pass jwt token via header like Authorization: Bearer 1234

Custom user class automatically decodes header token and store user information into request.user

If you want to modify custom user class, you have to update below files.

1. core/fastapi/schemas/current_user.py
2. core/fastapi/middlewares/authentication.py

CurrentUser

class CurrentUser(BaseModel):
    id: int = None

Simply add more fields based on your needs.

AuthBackend

current_user = CurrentUser()

After line 18, assign values that you added on CurrentUser.

Top-level dependency

Note. Available from version 0.62 or higher.

Set a callable function when initialize FastAPI() app through dependencies argument.

Refer Logging class inside of core/fastapi/dependencies/logging.py

Dependencies for specific permissions

Permissions IsAdmin and IsAuthenticated have already been implemented.

from core.fastapi.dependencies import (
    PermissionDependency,
    IsAdmin,
)


user_router = APIRouter()


@user_router.get(
    "",
    response_model=List[GetUserListResponseSchema],
    response_model_exclude={"id"},
    responses={"400": {"model": ExceptionResponseSchema}},
    dependencies=[Depends(PermissionDependency([IsAdmin]))],  # HERE
)
async def get_user_list(limit: int = 10, prev: int = None):
    pass

Insert permission through dependencies argument.

If you want to make your own permission, inherit BasePermission and implement has_permission() function.

Event dispatcher

Refer the README of https://github.com/teamhide/fastapi-event

Cache

from core.helpers.cache import Cacheable


@Cacheable(prefix="get_user", ttl=60)
async def get_user():
    ...

Use the Cacheable decorator to cache the return value of a function.

Depending on the argument of the function, caching is stored with a different value through internal processing.

Custom Key builder

from core.helpers.cache.base import BaseKeyMaker


class CustomKeyMaker(BaseKeyMaker):
    async def make(self, function: Callable) -> str:
        ...

If you want to create a custom key, inherit the BaseKeyMaker class and implement the make() method.

@Cacheable(prefix="get_user", ttl=60, key_maker=CustomKeyMaker)

And pass your class via key_maker arguments.

If no value is given to the key_maker argument, the function implemented by default is used.

Custom Backend

from core.helpers.cache.base import BaseBackend


class RedisBackend(BaseBackend):
    async def get(self, key: str) -> Any:
        ...

    async def save(self, response: Any, key: str) -> None:
        ...

If you want to create a custom key, inherit the BaseBackend class and implement the get() and save() method.

@Cacheable(prefix="get_user", ttl=60, backend=RedisBackend)

And pass your class via backend arguments.

If no value is given to the backend argument, the function implemented by default is used.

Set default backend/keymaker

Cacheable.init_backend(backend=RedisBackend)
Cacheable.init_key_maker(backend=CustomKeyMaker)

Add the above line when the server is startup.