aiohug

Goals:

• Unpack aiohttp (>=3.1) request to arguments with annotations
• Validate handlers arguments
• Generate swagger specification

Posts:

• Meet the aiohug

Examples

Arguments from path and query

from aiohttp import web
from aiohug import RouteTableDef
from marshmallow import fields

routes = RouteTableDef()


@routes.get("/hello/{name}/")
async def hello(name: fields.String(), greeting: fields.String() = "Hello"):
    return {"msg": f"{greeting}, {name}"}


app = web.Application()
app.add_routes(routes)


if __name__ == "__main__":
    web.run_app(app)

There is no request object in handler signature anymore - only required arguments.

Body with schema

from aiohttp import web
from aiohug import RouteTableDef

routes = RouteTableDef()

class PayloadSchema(Schema):
    count = fields.Int()

@routes.get("/")
async def with_body(body: PayloadSchema()):
    return body

app = create_app()
app.add_routes(routes)

client = await test_client(app)
resp = await client.get("/", json={"count": "5", "another": 7})

assert await resp.json() == {"count": 5}

Another shortcuts

@routes.post("/ping/")
async def ping():
  return 201, "pong"

Swagger

Use aiohug_swagger package.

Decorators

Because of the way aiohttp routing works all decorators to resource handlers must be applied BEFORE aiohug's routing decorator, i.e.

def some_decorator(func):

 @wraps(func)
 def wrapper(request, *args, **kwargs):
     # Some logic for decorator
     return func(*args, **kwargs)

 return wrapper


 @routes.get("/ping/")
 @some_decorator
 async def hello():
     return "pong"

Moreover, make sure to decorate wrapper functions with wraps decorator from functools module - otherwise aiohug won't be able to access original handler's arguments and annotations.

Why aiohug?

It's just hug API implementation for aiohttp

TODO:

• don’t pass default arguments