https://github.com/channelstream/channelstream

Channelstream is a websocket communication server for web applications
https://github.com/channelstream/channelstream

async broadcast chat comunication django flask gevent javascript long-pooling notification-service pyramid python socket-server webapp websocket websockets

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Channelstream is a websocket communication server for web applications

• Host: GitHub
• URL: https://github.com/channelstream/channelstream
• Owner: Channelstream
• License: bsd-3-clause
• Created: 2014-03-19T21:23:43.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2023-01-01T16:30:30.000Z (almost 2 years ago)
• Last Synced: 2024-05-19T05:39:29.635Z (6 months ago)
• Topics: async, broadcast, chat, comunication, django, flask, gevent, javascript, long-pooling, notification-service, pyramid, python, socket-server, webapp, websocket, websockets
• Language: Python
• Homepage:
• Size: 4.73 MB
• Stars: 60
• Watchers: 9
• Forks: 13
• Open Issues: 14
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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README

        
# Channelstream

[![Build Status]](https://travis-ci.org/Channelstream/channelstream)

This is a websocket-based real-time communication server,

your applications communicate with it via simple JSON REST API.

Visit http://channelstream.org for more information.

## Installation and Setup

Use from docker:

    docker pull channelstream/channelstream:latest

    docker run --rm -p 8000:8000 -e CHANNELSTREAM_ALLOW_POSTING_FROM=0.0.0.0 channelstream/channelstream:latest

# Direct usage

Obtain source from github and do:

    YOUR_PYTHON_ENV/bin/pip install channelstream

Generate new configuration:

    YOUR_PYTHON_ENV/bin/channelstream_utils make_config -o config.ini

Start the server:

    YOUR_PYTHON_ENV/bin/channelstream -i config.ini

## Demos

Demo applications live in https://github.com/Channelstream/channelstream_demos repository.

They show common patterns used in real-time applications.

### Security and communication model

Channelstream provides API explorer that you can use to interact with various

endpoints, it is available by default under http://127.0.0.1:8000/api-explorer.

To send information client interacts only with your normal www application.

Your app handled authentication and processing messages from client, then passed

them as signed message to channelstream server for broadcast.

websocket client -> webapp (security and transformation happens here) -> REST call to socket server -> broadcast to other clients

This model is easy to implement, secure, easy to scale and allows all kind of

languages/apps/work queues to interact with socket server.

All messages need to be signed with a HMAC of destination endpoint ::

    import requests

    from itsdangerous import TimestampSigner

    signer = TimestampSigner(SERVER_SECRET)

    sig_for_server = signer.sign('/connect')

    secret_headers = {'x-channelstream-secret': sig_for_server,

                      'Content-Type': 'application/json'}

    response = requests.post(url, data=json.dumps(payload),

                             headers=secret_headers).json()

## Data format and endpoints

Please consult API Explorer (http://127.0.0.1:8000/api-explorer) for in depth information

about endpoints.

Some examples:

* /connect **POST** connects users to the server

* /subscribe **POST** Subscribes connection to new channels

* /unsubscribe **POST** Removes connection from channels

* /user_state **POST** set the state of specific user

* /message **POST** Send message to channels and/or users

* /message **DELETE** Delete message from history and emit changes

* /message **PATCH** Edit existing message in history and emit changes

* /channel_config **POST** Set channel configuration

* /info **POST** Returns channel information

Client API

* /ws **GET** Handles websocket connections

* /listen **GET** Handles long polling connections

* /disconnect **GET** Permanently remove connection from server

* /disconnect **POST** Permanently remove connection from server

Admin API

* /admin/admin.json **GET** Return server information in json format for admin panel purposes

* /admin/admin.json **POST** Return server information in json format for admin panel purposes

### Responses to js client

Responses to client are in form of **list** containing **objects**:

examples:

**new message** ::

    {

    "date": "2011-09-15T11:36:18.471862",

    "message": MSG_PAYLOAD,

    "type": "message",

    "user": "NAME_OF_POSTER",

    "channel": "CHAN_NAME"

    }

**presence info** ::

    {

    "date": "2011-09-15T11:43:47.434905",

    "message": {"action":"joined/parted"},

    "type": "presence",

    "user": "NAME_OF_POSTER",

    "channel": "CHAN_NAME"

    }

Currently following message types are emited: `message`, `message:edit`,

`message:delete`, `presence`, `user_state_change`.

[Build Status]: https://travis-ci.org/Channelstream/channelstream.svg?branch=master