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Metadata-Version: 2.1
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Name: trio-websocket
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Version: 0.11.1
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Summary: WebSocket library for Trio
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Home-page: https://github.com/python-trio/trio-websocket
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Author: Mark E. Haase
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Author-email: mehaase@gmail.com
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Project-URL: Bug Reports, https://github.com/python-trio/trio-websocket/issues
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Project-URL: Source, https://github.com/python-trio/trio-websocket
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Keywords: websocket client server trio
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Classifier: Development Status :: 3 - Alpha
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Classifier: Intended Audience :: Developers
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Classifier: Topic :: Software Development :: Libraries
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Classifier: License :: OSI Approved :: MIT License
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Classifier: Programming Language :: Python :: 3.7
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Classifier: Programming Language :: Python :: 3.8
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Classifier: Programming Language :: Python :: 3.9
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Classifier: Programming Language :: Python :: 3.10
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Classifier: Programming Language :: Python :: 3.11
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Classifier: Programming Language :: Python :: 3.12
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Classifier: Programming Language :: Python :: Implementation :: CPython
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Classifier: Programming Language :: Python :: Implementation :: PyPy
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Requires-Python: >=3.7
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Description-Content-Type: text/markdown
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License-File: LICENSE
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Requires-Dist: trio >=0.11
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Requires-Dist: wsproto >=0.14
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Requires-Dist: exceptiongroup ; python_version < "3.11"
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# Trio WebSocket
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This library implements both server and client aspects of the [the WebSocket
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protocol](https://tools.ietf.org/html/rfc6455), striving for safety,
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correctness, and ergonomics. It is based on the [wsproto
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project](https://wsproto.readthedocs.io/en/latest/), which is a
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[Sans-IO](https://sans-io.readthedocs.io/) state machine that implements the
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majority of the WebSocket protocol, including framing, codecs, and events. This
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library handles I/O using [the Trio
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framework](https://trio.readthedocs.io/en/latest/). This library passes the
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[Autobahn Test Suite](https://github.com/crossbario/autobahn-testsuite).
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This README contains a brief introduction to the project. Full documentation [is
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available here](https://trio-websocket.readthedocs.io).
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[](https://pypi.org/project/trio-websocket/)
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[](https://github.com/python-trio/trio-websocket/actions/workflows/ci.yml)
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[](https://trio-websocket.readthedocs.io)
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## Alternatives
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If you happen to only need a server, using Quart via the [quart-trio](https://github.com/pgjones/quart-trio)
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extension may suffice. While trio-websocket is more flexible, Quart covers
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both HTTP and WebSocket within a single framework, and serving both from the
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same port is straightforward. There has yet to be a performance comparison.
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## Installation
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This library requires Python 3.7 or greater. To install from PyPI:
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pip install trio-websocket
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## Client Example
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This example demonstrates how to open a WebSocket URL:
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```python
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import trio
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from sys import stderr
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from trio_websocket import open_websocket_url
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async def main():
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try:
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async with open_websocket_url('wss://echo.websocket.org') as ws:
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await ws.send_message('hello world!')
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message = await ws.get_message()
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print('Received message: %s' % message)
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except OSError as ose:
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print('Connection attempt failed: %s' % ose, file=stderr)
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trio.run(main)
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```
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The WebSocket context manager connects automatically before entering the block
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and disconnects automatically before exiting the block. The full API offers a
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lot of flexibility and additional options.
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## Server Example
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A WebSocket server requires a bind address, a port, and a coroutine to handle
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incoming connections. This example demonstrates an "echo server" that replies to
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each incoming message with an identical outgoing message.
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```python
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import trio
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from trio_websocket import serve_websocket, ConnectionClosed
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async def echo_server(request):
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ws = await request.accept()
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while True:
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try:
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message = await ws.get_message()
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await ws.send_message(message)
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except ConnectionClosed:
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break
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async def main():
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await serve_websocket(echo_server, '127.0.0.1', 8000, ssl_context=None)
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trio.run(main)
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```
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The server's handler ``echo_server(…)`` receives a connection request object.
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This object can be used to inspect the client's request and modify the
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handshake, then it can be exchanged for an actual WebSocket object ``ws``.
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Again, the full API offers a lot of flexibility and additional options.
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