asgikit 0.9.0

Toolkit for building ASGI applications and libraries

Asgikit - ASGI Toolkit

Asgikit is a toolkit for building asgi applications and frameworks.

It is intended to be a minimal library and provide the building blocks for other libraries.

The examples directory contain usage examples of several use cases

Features:

• Request
  • Headers
  • Cookies
  • Body (bytes, str, json, stream)
  • Form
• Response
  • Plain text
  • Json
  • Streaming
  • File
• Websockets

Request and Response

Asgikit Request and Response were designed to be have minimal interfaces, so they only provide very few methods to read from the request and write to the response. In particular, the Response works differently from most tools, in which you do not return a response, but you write data into it.

It is provided several functions to interact with the request and the response, for instance, to read form data from the request and write json to the response.

This strategy allows for simpler extensibility. For example, to parse json from the request using an alternative json parser, you just need to write a function that reads the request. Similarly, to write another data format into the response, you just write a function that writes to the response.

Custom JSON encoder and decoder

By default, asgikit uses json.dumps and json.loads for dealing with JSON. If you want to use other libraries like orjson, just define the environment variable ASGIKIT_JSON_ENCODER of the module compatible with json, or the full path to the functions that perform encoding and decoding, in that order:

ASGIKIT_JSON_ENCODER=orjson
# or
ASGIKIT_JSON_ENCODER=msgspc.json.encode,msgspc.json.encode

Example request and response

from asgikit.requests import Request, read_json
from asgikit.responses import respond_json


async def main(scope, receive, send):
  request = Request(scope, receive, send)

  # request method
  method = request.method

  # request path
  path = request.path

  # request headers
  headers = request.headers

  # read body as json
  body_json = await read_json(request)

  data = {
    "lang": "Python",
    "async": True,
    "platform": "asgi",
    "method": method,
    "path": path,
    "headers": dict(headers.items()),
    "body": body_json,
  }

  # send json response
  await respond_json(request.response, data)

Example websocket

from asgikit.requests import Request
from asgikit.errors.websocket import WebSocketDisconnectError

async def app(scope, receive, send):
    request = Request(scope, receive, send)
    ws = request.websocket
    await ws.accept()

    while True:
        try:
            message = await ws.receive()
            await ws.send(message)
        except WebSocketDisconnectError:
            print("Client disconnect")
            break