Deta Space Actions

Python package to interact with Deta Space Actions.

Ported from the Node package deta-space-actions.

This package is somewhat temporary, hopefully its functionality will be implemented in a future version of the official Deta Python SDK.

Features

• Dependency-free
• Includes type hints
• Supports Python 3.8 and above
• Object-oriented interface for defining and invoking actions
• Generic ASGI middleware
• Optional type checking support for the middleware

TODO

• Invocation function
• Better typing
• Add tests

Installation

To install the latest in-development version:

python -m pip install git+https://github.com/lemonyte/deta-space-actions

Or, to install a specific commit:

python -m pip install git+https://github.com/lemonyte/deta-space-actions@{commit}

If you want full type checking support for the ASGI middleware, you'll also need to install asgiref with:

python -m pip install asgiref

Or use the optional dependency syntax:

python -m pip install "deta-space-actions[typing] @ git+https://github.com/lemonyte/deta-space-actions"

Usage

Using the middleware

The package provides a generic ASGI middleware class that can be used with any ASGI framework.

from deta_space_actions import Actions, ActionsMiddleware, Input, InputType

# Create an ASGI app.
app = ...
# Create an Actions instance.
actions = Actions()
# Add the middleware if your framework has a helper method for adding middleware.
app.add_middleware(ActionsMiddleware, actions=actions)
# Otherwise, wrap the app instance.
app = ActionsMiddleware(app, actions=actions)


# Add an action.
@actions.action(
    title="Say hello",
    inputs=[
        Input(
            name="name",
            type=InputType.STRING,
            optional=False,
        ),
    ],
)
async def hello(payload):
    return f"Hello, {payload.get('name', 'world')}!"

Using your own path handler

Alternatively, you can write your own handler function and use it with your framework's routing system. An example for FastAPI is shown below.

import json

from fastapi import FastAPI, HTTPException, Request

from deta_space_actions import Actions, Input, InputType

# Create a FastAPI app.
app = FastAPI()
# Create an Actions instance.
actions = Actions()


# Add an action.
@actions.action(
    title="Say hello",
    inputs=[
        Input(
            name="name",
            type=InputType.STRING,
            optional=False,
        ),
    ],
)
async def hello(payload):
    return f"Hello, {payload.get('name', 'world')}!"


# Define a path handler.
@app.post("/__space/actions/{action_name}")
async def actions_handler(action_name: str, request: Request):
    action = actions.get(action_name)
    if not action:
        raise HTTPException(404)
    try:
        payload = await request.json()
    except json.JSONDecodeError:
        payload = {}
    return await action.run(payload)

License

MIT License