Serve files directly from Django.

django_fileresponse (link to documentation) is a library that allows you to serve files directly from Django.

Features of django_fileresponse

django_fileresponse provides the following features for developers:

  • Use asyncio to serve files with high concurrency directly from Django.
  • Uses aiofiles to asynchronously read from filesystem and aiobotocore to asynchronously read from s3 compatible object stores

Installing

django_fileresponse is on PyPI so you can just run pip install django_fileresponse.

Replace Default ASGIHandler

You have to replace Djangos ASGIHandler, because it synchronously calls __next__ in for part in response which makes it impossible to await reading from a filesystem/object-store.

So you have to replace the default ASGIHandler in asgi.py.

So instead of building your application like this:

from django.core.asgi import get_asgi_application

application = get_asgi_application()

You have to import a modified ASGIHandler from fileresponse:

from fileresponse.asgi import get_asgi_application

application = get_asgi_application()

If you use a different mechanism to launch your application, you could also just import the modified AsyncFileASGIHandler directly:

from fileresponse.handlers import AsyncFileASGIHandler

django.setup(set_prefix=False)
application = AsyncFileASGIHandler()

How to use Async Fileresponses in your Views

Add functions below to your views.py

Serving from Filesystem 

from fileresponse.http import AiofileFileResponse as AiofileFileResponse


async def get_file(request, path):
    file_path = Path(path)
    return AiofileFileResponse(file_path)

Serve Files from an S3 Compatible Object Store 

from fileresponse.http import AiobotocoreFileResponse


async def get_file(request, key):
    bucket = settings.FILERESPONSE_S3_ACCESS_KEY_ID
    return AiobotocoreFileResponse(bucket, key, chunk_size=4096)

Settings

Example Settings for an S3 Compatible Object Store 

FILERESPONSE_S3_ACCESS_KEY_ID="minioadmin"
FILERESPONSE_S3_SECRET_ACCESS_KEY="minioadmin"
FILERESPONSE_S3_REGION="us-west-2"
FILERESPONSE_S3_STORAGE_BUCKET_NAME="fileresponse"
FILERESPONSE_S3_ENDPOINT_URL="http://localhost:9000"

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