Async library for building Ruby on Rails Action Cable clients, built on top of websockets.
Project description
aioactioncable: async Action Cable client library
aioactioncable is a python library for building Ruby on Rails Action Cable clients.
The library is based on websockets and asyncio.
aioactioncable is thus an async Rails Action Cable client library.
Installation
$ python3 -m pip install aioactioncable
aioactioncable requires Python 3 and therefore needs to be installed using the Python 3 version of pip.
Requirements
- Python >= 3.7
- websockets
Usage
In addition to managing websockets connections, Action Cable servers manage multiple channels, that clients can subscribe to.
Here is a code example to connect to an Action Cable server, subscribe to a channel and receive messages on that channel:
#!/usr/bin/env python3
import aioactioncable
import asyncio
import json
def process(msg, identifier)
msg_json = json.loads(msg)
print(f'Message received on {json.dumps(identifier)}')
...
async def ac_recv(uri, identifier):
async with aioactioncable.connect(uri) as acconnect:
subscription = await acconnect.subscribe(identifier)
async for msg in subscription:
process(msg, identifier)
asyncio.run(ac_recv('wss://example.app', {'channel': 'ChatChannel'}))
All the code examples below must be run in an asyncio event loop. Examples are built "chronologically", object created in Connect section is reused in Subscribe section, and so on.
Connect to an Action Cable server
import aioactioncable
acconnect = aioactioncable.connect(uri)
aioactioncable Connect object is an async context manager, you can thus use it in an async with
statement:
import aioactioncable
import asyncio
async with aioactioncable.connect('wss://example.app') as acconnect:
...
Subscribe to an Action Cable channel
subscription = await acconnect.subscribe({'channel': 'ChatChannel'})
Recv messages on an Action Cable channel
Receive next message on subscription channel:
msg = await subscription.recv()
Subscription object is an iterable, you can thus iterate over to recv messages in an async for loop:
async for msg in subscription:
...
Send messages on an Action Cable channel
await subscription.send({'action': 'create', 'chatRoom': 'climbing'})
Unsubscribe from an Action Cable channel
await subscription.unsubscribe()
Close an Action Cable server connection
Explicit close of the connection is not needed if it is done in an async with
statement.
Otherwise:
await acconnect.close()
License
aioactioncable is distributed under the MIT license.
Contributions
Contributions are very welcome!
Feel free to open an issue for any bug report.
Feel free to propose bug fixes or features via a Pull Request.
Project details
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