aiohttp-apischema

API schema generation and input validation for aiohttp.web.

Installation

Install from PyPI:

pip install aiohttp-apischema

Developing

Install requirement and launch tests:

pip install -r requirements-dev.txt
pytest

Basic usage

First create a SchemaGenerator instance:

from aiohttp_apischema import SchemaGenerator
SCHEMA = SchemaGenerator()

Then decorate endpoint handlers which should be included in the schema:

from aiohttp_apischema import APIResponse

@SCHEMA.api()
async def foo(request: web.Request) -> APIResponse[list[str], Literal[200]]:
    return APIResponse(["foo"])

Or for Class Based Views:

@SCHEMA.api_view()
class Handler(web.View):
    async def get(self) -> APIResponse[int, Literal[200]] | APIResponse[None, Literal[404]]:
        bar_id = int(self.request.match_info["id"])
        if bar_id == 1:
            return APIResponse(42)
        return APIResponse[None, Literal[404]](None, status=404)

Then call the setup method when building your app:

app = web.Application()
app.router.add_get("/foo", foo)
app.router.add_view(r"/bar/{id:\d+}", Handler)
SCHEMA.setup(app)

You can now view the docs under the /swagger/ path.

Validation usage

Validation of the request body is achieved by adding a positional parameter:

async def handler(request: web.Request, body: dict[int, str]) -> APIResponse[int, Literal[200]]:
    # body has been validated, so we can be sure the keys are int now.
    return APIResponse(sum(body.keys()))

License

aiohttp_apischema is offered under the Apache 2 license.