aiohttp-extracts

This library allows you to extract variable number of request parameters to a handler's arguments. It uses type hints to determine where each value must be extracted from.

For example

With aiohttp-extracts:

from aiohttp import web
from aiohttp_extracts import with_extraction
from aiohttp_extracts import RequestAttr, MatchInfo, QueryAttr


routes = web.RouteTableDef()


@routes.get(r'/chats/{chat_id:(\d+)}/')
@with_extraction
async def handler(
    user: RequestAttr[int],           # by default it uses argument name
    chat: MatchInfo['chat_id', int],  # but you can specify name what you want
    offset: QueryAttr[int] = 0,       # and you can simply set a default value
    count: QueryAttr[int] = 100
) -> web.Response:
    ...

Without aiohttp-extracts:

from aiohttp import web
from aiohttp_extracts import with_extraction


routes = web.RouteTableDef()


@routes.get(r'/chats/{chat_id:(\d+)}/')
async def handler(request: web.Request):
    user = request.get('user')
    chat = request.match_info.get('chat_id')
    offset = request.query.get('offset', 0)
    count = request.query.get('count', 100)
) -> web.Response:
    ...

Installation

Installation process as simple as:

$ pip install aiohttp-extracts

Usage

First we need to set a middleware to app.

from aiohttp import web
from aioservertiming import server_timing_mware

app = web.Applicalion(
    middlewares = [
        server_timing_mware
    ]
)

Usual handler

from aiohttp import web
from aiohttp_extracts import with_extraction
from aiohttp_extracts import RequestAttr, MatchInfo, QueryAttr


@with_extraction
async def handler(
    user: RequestAttr[int],
    chat: MatchInfo['chat_id', int],
    offset: QueryAttr[int] = 0,
    count: QueryAttr[int] = 100
) -> web.Response:
    ...

Classview

With decorator

from aiohttp import web
from aiohttp_extracts import with_extraction
from aiohttp_extracts import RequestAttr, MatchInfo, QueryAttr


@extract_classview
class ChatView(web.View):

    async def get(
        user: RequestAttr[int],
        chat: MatchInfo['chat_id', int],
        offset: QueryAttr[int] = 0,
        count: QueryAttr[int] = 100
    ) -> web.Response:
        ...

With metaclass

from aiohttp import web
from aiohttp_extracts import ExtractionMeta
from aiohttp_extracts import RequestAttr, MatchInfo, QueryAttr


class ChatView(web.View, metaclass=ExtractionMeta):

    async def get(
        user: RequestAttr[int],
        chat: MatchInfo['chat_id', int],
        offset: QueryAttr[int] = 0,
        count: QueryAttr[int] = 100
    ) -> web.Response:
        ...

Types that can be used in handlers args

Links

This library on PyPI