lesync 0.3.0

Http helpers for django-channels

Lesync

Http helpers for django-channels

Hello world

from lesync import login_required

@login_required
async def hello(request):
    return {'hello': request.user.username}

Install

pip install lesync

Add ApiConsumer into your routing.py:

from django.urls import path
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.sessions import SessionMiddlewareStack
from lesync import ApiConsumer

application = ProtocolTypeRouter({
    # ... websockets or something
    'http': SessionMiddlewareStack(
        URLRouter([
            path('/async/<path:path>', ApiConsumer),
            # ... fallback to sync views
        ]),
    ),
})

That's it. Now you can add async views which will be served win /async/ url prefix.

Request

Subclass of channels.http.AsgiRequest with:

• json attribute
• async load_user() method - which returns standard django user
• user attribute - it's available after calling load_user() of if you use @login_required or @staff_member_required decorators

Response

In addition to django.http.HttpResponse you can use sugary json responses and streaming:

async def standard(request):
    return HttpResponse('hello, world')

async def json_data(request):
    return {'hello': 'world'}

async def with_status(request):
    return {'bad': 'request'}, 400

async def with_headers(request):
    return {}, 200, {'my': 'header'}

async def streaming(request):
    async def stream():
        for i in range(1, 1000):
            yield f'{i},{i**2}\n'
            await asyncio.sleep(.1)
    return stream(), 200, {'Content-Type': 'text/csv'}

Auth

Familiar @login_required and @staff_member_required decorators:

from lesync import staff_member_required

@staff_member_required
async def hello(request):
    return {'admin': request.user.username}

Request validation

You can use @validate_query and @validate_json decorators to validate requests data. They're using trafaret library to perform validation, so make sure it's installed.

from lesync.trafaret import validate_json

@validate_json({'ids': [int], 'hello?': str})
async def foo(request):
    return request.json

Tests

    python -m venv .venv
    source .venv/bin/activate
    pip install -Ur requirements-dev.txt
    python -m pytest tests/