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Wolfram Language Operating System and Network Access

Support for Secure (Web) Sockets in the Wolfram Language?

Pedro Cabral

Pedro Cabral, Data Analyst @ Solar Coca-Cola | CS @ UNIFOR

Posted 3 years ago

Hello everyone! I'm trying to connect to a service that uses Websockets (RFC 6455), specifically, Secure Websockets, that work over `HTTPS` (this information will be useful later). I've tried many ways of doing so, first, using a `wss://` does not work. Of course, because `SocketConnect` is meant for a raw TCP socket. In[1]:= SocketConnect["wss://echo.websocket.org"] During evaluation of In[1]:= SocketConnect::addrspec: The host specification echo.websocket.org is wrong because it is missing the port specification Out[1]= $Failed One workaround was to use `:443` at the end to specify the "secure" port. In[2]:= SocketConnect["echo.websocket.org:443"] Out[2]= SocketObject["TCP-<<UUID>>"] Which worked fine, but later on, when sending a "homemade" Opening Handshake (Section 1.3 from RFC6455), one big catastrophic thing happened, the SocketConnect works over `HTTP`, and not `HTTPS`. The following Cloudfare message told me a very unhappy message for me. 400 Bad Request - Plain HTTP request sent over HTTPS. I've tried using the internal `SocketLink` library, but with no success, because it doesn't work with HTTPS as well. In[3]:= Needs["SocketLink`"] (* and some stuff i tried.. ) Out[3]= ¯\_(ツ)_/¯ ( also uses HTTP, and crashes the kernel sometimes ) My last resort would be to write a C external function for dealing with Websockets and Secure Websockets, but I'm here asking for any other possible and easier options. So.. what should I do? Should I wait for a `SecureSocketConnect`? Is there any workaround that does not involve using other programming languages? Any help would be extremely appreciated! Thanks! Pedro Cabral*.

POSTED BY: Pedro Cabral

3 Replies

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Nicolò Monti

Nicolò Monti, ASC27

Posted 3 years ago

Hello Pedro, Rather than writing that in C, you could use Python's websockets library, so in the meantime you find a solution you can get this done. I'm sure there is a better way to do it, but you can play around with this First install websockets: $ pip3 install websockets Then: send = " import asyncio import websockets output : object async def send(): global output uri = 'wss://echo.websocket.org' async with websockets.connect(uri) as websocket: await websocket.send('Hello World!') output = await websocket.recv() asyncio.get_event_loop().run_until_complete(send()) output " session = StartExternalSession["Python"] output = ExternalEvaluate[session, send] Output should be equal to "Hello World!"

Hello Pedro,

Rather than writing that in C, you could use Python's websockets library, so in the meantime you find a solution you can get this done.

I'm sure there is a better way to do it, but you can play around with this

First install websockets:

$ pip3 install websockets

Then:

send = "
import asyncio
import websockets

output : object

async def send():
    global output

    uri = 'wss://echo.websocket.org'

    async with websockets.connect(uri) as websocket:
       await websocket.send('Hello World!')
       output = await websocket.recv()

asyncio.get_event_loop().run_until_complete(send())

output
"

session = StartExternalSession["Python"]
output = ExternalEvaluate[session, send]

Output should be equal to "Hello World!"

POSTED BY: Nicolò Monti

Philipp Winkler

Posted 3 years ago

Hi Pedro, have you been able to come up with a working solution?

POSTED BY: Philipp Winkler

Philipp Winkler

Posted 3 years ago

I am also very interested in this for streaming quotes from exchanges and already made a feature request. Hopefully there will be a build in solution in the not too distant future.

POSTED BY: Philipp Winkler

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