| .. image:: logo/horizontal.svg |
| :width: 480px |
| :alt: websockets |
| |
| |rtd| |pypi-v| |pypi-pyversions| |pypi-l| |pypi-wheel| |circleci| |codecov| |
| |
| .. |rtd| image:: https://readthedocs.org/projects/websockets/badge/?version=latest |
| :target: https://websockets.readthedocs.io/ |
| |
| .. |pypi-v| image:: https://img.shields.io/pypi/v/websockets.svg |
| :target: https://pypi.python.org/pypi/websockets |
| |
| .. |pypi-pyversions| image:: https://img.shields.io/pypi/pyversions/websockets.svg |
| :target: https://pypi.python.org/pypi/websockets |
| |
| .. |pypi-l| image:: https://img.shields.io/pypi/l/websockets.svg |
| :target: https://pypi.python.org/pypi/websockets |
| |
| .. |pypi-wheel| image:: https://img.shields.io/pypi/wheel/websockets.svg |
| :target: https://pypi.python.org/pypi/websockets |
| |
| .. |circleci| image:: https://img.shields.io/circleci/project/github/aaugustin/websockets.svg |
| :target: https://circleci.com/gh/aaugustin/websockets |
| |
| .. |codecov| image:: https://codecov.io/gh/aaugustin/websockets/branch/master/graph/badge.svg |
| :target: https://codecov.io/gh/aaugustin/websockets |
| |
| What is ``websockets``? |
| ----------------------- |
| |
| ``websockets`` is a library for building WebSocket servers_ and clients_ in |
| Python with a focus on correctness and simplicity. |
| |
| .. _servers: https://github.com/aaugustin/websockets/blob/master/example/server.py |
| .. _clients: https://github.com/aaugustin/websockets/blob/master/example/client.py |
| |
| Built on top of ``asyncio``, Python's standard asynchronous I/O framework, it |
| provides an elegant coroutine-based API. |
| |
| `Documentation is available on Read the Docs. <https://websockets.readthedocs.io/>`_ |
| |
| Here's how a client sends and receives messages: |
| |
| .. copy-pasted because GitHub doesn't support the include directive |
| |
| .. code:: python |
| |
| #!/usr/bin/env python |
| |
| import asyncio |
| import websockets |
| |
| async def hello(uri): |
| async with websockets.connect(uri) as websocket: |
| await websocket.send("Hello world!") |
| await websocket.recv() |
| |
| asyncio.get_event_loop().run_until_complete( |
| hello('ws://localhost:8765')) |
| |
| And here's an echo server: |
| |
| .. code:: python |
| |
| #!/usr/bin/env python |
| |
| import asyncio |
| import websockets |
| |
| async def echo(websocket, path): |
| async for message in websocket: |
| await websocket.send(message) |
| |
| asyncio.get_event_loop().run_until_complete( |
| websockets.serve(echo, 'localhost', 8765)) |
| asyncio.get_event_loop().run_forever() |
| |
| Does that look good? |
| |
| `Get started with the tutorial! <https://websockets.readthedocs.io/en/stable/intro.html>`_ |
| |
| .. raw:: html |
| |
| <hr> |
| <img align="left" height="150" width="150" src="https://raw.githubusercontent.com/aaugustin/websockets/master/logo/tidelift.png"> |
| <h3 align="center"><i>websockets for enterprise</i></h3> |
| <p align="center"><i>Available as part of the Tidelift Subscription</i></p> |
| <p align="center"><i>The maintainers of websockets and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. <a href="https://tidelift.com/subscription/pkg/pypi-websockets?utm_source=pypi-websockets&utm_medium=referral&utm_campaign=readme">Learn more.</a></i></p> |
| <hr> |
| <p>(If you contribute to <code>websockets</code> and would like to become an official support provider, <a href="https://fractalideas.com/">let me know</a>.)</p> |
| |
| Why should I use ``websockets``? |
| -------------------------------- |
| |
| The development of ``websockets`` is shaped by four principles: |
| |
| 1. **Simplicity**: all you need to understand is ``msg = await ws.recv()`` and |
| ``await ws.send(msg)``; ``websockets`` takes care of managing connections |
| so you can focus on your application. |
| |
| 2. **Robustness**: ``websockets`` is built for production; for example it was |
| the only library to `handle backpressure correctly`_ before the issue |
| became widely known in the Python community. |
| |
| 3. **Quality**: ``websockets`` is heavily tested. Continuous integration fails |
| under 100% branch coverage. Also it passes the industry-standard `Autobahn |
| Testsuite`_. |
| |
| 4. **Performance**: memory use is configurable. An extension written in C |
| accelerates expensive operations. It's pre-compiled for Linux, macOS and |
| Windows and packaged in the wheel format for each system and Python version. |
| |
| Documentation is a first class concern in the project. Head over to `Read the |
| Docs`_ and see for yourself. |
| |
| .. _Read the Docs: https://websockets.readthedocs.io/ |
| .. _handle backpressure correctly: https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#websocket-servers |
| .. _Autobahn Testsuite: https://github.com/aaugustin/websockets/blob/master/compliance/README.rst |
| |
| Why shouldn't I use ``websockets``? |
| ----------------------------------- |
| |
| * If you prefer callbacks over coroutines: ``websockets`` was created to |
| provide the best coroutine-based API to manage WebSocket connections in |
| Python. Pick another library for a callback-based API. |
| * If you're looking for a mixed HTTP / WebSocket library: ``websockets`` aims |
| at being an excellent implementation of :rfc:`6455`: The WebSocket Protocol |
| and :rfc:`7692`: Compression Extensions for WebSocket. Its support for HTTP |
| is minimal — just enough for a HTTP health check. |
| * If you want to use Python 2: ``websockets`` builds upon ``asyncio`` which |
| only works on Python 3. ``websockets`` requires Python ≥ 3.6.1. |
| |
| What else? |
| ---------- |
| |
| Bug reports, patches and suggestions are welcome! |
| |
| To report a security vulnerability, please use the `Tidelift security |
| contact`_. Tidelift will coordinate the fix and disclosure. |
| |
| .. _Tidelift security contact: https://tidelift.com/security |
| |
| For anything else, please open an issue_ or send a `pull request`_. |
| |
| .. _issue: https://github.com/aaugustin/websockets/issues/new |
| .. _pull request: https://github.com/aaugustin/websockets/compare/ |
| |
| Participants must uphold the `Contributor Covenant code of conduct`_. |
| |
| .. _Contributor Covenant code of conduct: https://github.com/aaugustin/websockets/blob/master/CODE_OF_CONDUCT.md |
| |
| ``websockets`` is released under the `BSD license`_. |
| |
| .. _BSD license: https://github.com/aaugustin/websockets/blob/master/LICENSE |