Python Language Websockets Using Autobahn as a Websocket Factory
Example
The Autobahn package can be used for Python web socket server factories.
Python Autobahn package documentation
To install, typically one would simply use the terminal command
(For Linux):
sudo pip install autobahn
(For Windows):
python -m pip install autobahn
Then, a simple echo server can be created in a Python script:
from autobahn.asyncio.websocket import WebSocketServerProtocol
class MyServerProtocol(WebSocketServerProtocol):
'''When creating server protocol, the
user defined class inheriting the
WebSocketServerProtocol needs to override
the onMessage, onConnect, et-c events for
user specified functionality, these events
define your server's protocol, in essence'''
def onMessage(self,payload,isBinary):
'''The onMessage routine is called
when the server receives a message.
It has the required arguments payload
and the bool isBinary. The payload is the
actual contents of the "message" and isBinary
is simply a flag to let the user know that
the payload contains binary data. I typically
elsewise assume that the payload is a string.
In this example, the payload is returned to sender verbatim.'''
self.sendMessage(payload,isBinary)
if__name__=='__main__':
try:
importasyncio
except ImportError:
'''Trollius = 0.3 was renamed'''
import trollius as asyncio
from autobahn.asyncio.websocketimportWebSocketServerFactory
factory=WebSocketServerFactory()
'''Initialize the websocket factory, and set the protocol to the
above defined protocol(the class that inherits from
autobahn.asyncio.websocket.WebSocketServerProtocol)'''
factory.protocol=MyServerProtocol
'''This above line can be thought of as "binding" the methods
onConnect, onMessage, et-c that were described in the MyServerProtocol class
to the server, setting the servers functionality, ie, protocol'''
loop=asyncio.get_event_loop()
coro=loop.create_server(factory,'127.0.0.1',9000)
server=loop.run_until_complete(coro)
'''Run the server in an infinite loop'''
try:
loop.run_forever()
except KeyboardInterrupt:
pass
finally:
server.close()
loop.close()
In this example, a server is being created on the localhost (127.0.0.1) on port 9000. This is the listening IP and port. This is important information, as using this, you could identify your computer's LAN address and port forward from your modem, though whatever routers you have to the computer. Then, using google to investigate your WAN IP, you could design your website to send WebSocket messages to your WAN IP, on port 9000 (in this example).
It is important that you port forward from your modem back, meaning that if you have routers daisy chained to the modem, enter into the modem's configuration settings, port forward from the modem to the connected router, and so forth until the final router your computer is connected to is having the information being received on modem port 9000 (in this example) forwarded to it.
