WebSocket client & server library, WAMP real-time framework
Project description
WebSocket & WAMP for Python on Twisted and asyncio.
Introduction
Autobahn|Python is a subproject of Autobahn and provides open-source implementations of
for Python 2 and 3, and running on Twisted and asyncio.
You can use Autobahn|Python to create clients and servers in Python speaking just plain WebSocket or WAMP.
WebSocket allows bidirectional real-time messaging on the Web and beyond, while WAMP adds real-time application communication on top of WebSocket.
WAMP provides asynchronous Remote Procedure Calls and Publish & Subscribe for applications in one protocol running over WebSocket. WAMP is a routed protocol, so you need a WAMP Router to connect your Autobahn|Python based clients. We provide Crossbar.io, but there are other options as well.
Features
compatible with Python 2.7 and 3.4 or later (including 3.7)
runs under Twisted and asyncio - implements WebSocket RFC6455 and Draft Hybi-10+
implements WebSocket compression
implements WAMP, the Web Application Messaging Protocol
high-performance, fully asynchronous implementation
best-in-class standards conformance (100% strict passes with Autobahn Testsuite: Client Server)
message-, frame- and streaming-APIs for WebSocket
supports TLS (secure WebSocket) and proxies
Open-source (MIT license)
Native vector extensions (NVX)
Autobahn contains NVX, a network accelerator library that provides SIMD accelerated native vector code for WebSocket (XOR masking) and UTF-8 validation.
WAMP Serializers
Above is for advanced uses. In general we recommend to use CBOR where you can, and JSON (from the standard library) otherwise.
To install Autobahn with all available serializers:
pip install autobahn[serializers]or (development install)
pip install -e .[serializers]Further, to speed up JSON on CPython using ujson, set the environment variable:
AUTOBAHN_USE_UJSON=1To use cbor2, an alternative, highly flexible and standards complicant CBOR implementation, set the environment variable:
AUTOBAHN_USE_CBOR2=1Show me some code
To give you a first impression, here are two examples. We have lot more in the repo.
WebSocket Echo Server
Here is a simple WebSocket Echo Server that will echo back any WebSocket message received:
from autobahn.twisted.websocket import WebSocketServerProtocol
# or: from autobahn.asyncio.websocket import WebSocketServerProtocol
class MyServerProtocol(WebSocketServerProtocol):
def onConnect(self, request):
print("Client connecting: {}".format(request.peer))
def onOpen(self):
print("WebSocket connection open.")
def onMessage(self, payload, isBinary):
if isBinary:
print("Binary message received: {} bytes".format(len(payload)))
else:
print("Text message received: {}".format(payload.decode('utf8')))
# echo back message verbatim
self.sendMessage(payload, isBinary)
def onClose(self, wasClean, code, reason):
print("WebSocket connection closed: {}".format(reason))To actually run above server protocol, you need some lines of boilerplate.
WAMP Application Component
Here is a WAMP Application Component that performs all four types of actions that WAMP provides:
subscribe to a topic
publish an event
register a procedure
call a procedure
from autobahn.twisted.wamp import ApplicationSession
# or: from autobahn.asyncio.wamp import ApplicationSession
class MyComponent(ApplicationSession):
@inlineCallbacks
def onJoin(self, details):
# 1. subscribe to a topic so we receive events
def onevent(msg):
print("Got event: {}".format(msg))
yield self.subscribe(onevent, 'com.myapp.hello')
# 2. publish an event to a topic
self.publish('com.myapp.hello', 'Hello, world!')
# 3. register a procedure for remote calling
def add2(x, y):
return x + y
self.register(add2, 'com.myapp.add2')
# 4. call a remote procedure
res = yield self.call('com.myapp.add2', 2, 3)
print("Got result: {}".format(res))Above code will work on Twisted and asyncio by changing a single line (the base class of MyComponent). To actually run above application component, you need some lines of boilerplate and a WAMP Router.
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