Proces realtime data from Node.js in Python

Question

I have a Node.js script collecting realtime data from motion sensors. I would like to pass each frame of data to a Python script and process the data there. I found a guide on how to send data to Python, but it just opens a lot of Python processes.

Is there a better way to send pass data from Node.js to Python to proces realtime data?

server.js

transFunc:function( component, parameters )
    {

        data2Python = Object.values(parameters).join()';

        const spawn = require('child_process').spawn;

        const process = spawn('python', ['./calculate_risk.py', data2Python]);
        process.stdout.on('data', function (data) {
            res.send(data.toString());
        });

    }

calculations.py

import pandas as pd
import sys

data = int(sys.argv[1]) # 3

def calculate_stuff(data):

    # do something with the data
    print(data)
    sys.stdout.flush()

calculate_stuff(data)

what on earth? this is no C#, change your brackets, its killing me. Also you need to watch out, this might cause you with a bugs. JS puts ";" after each line. — Talg123
– Talg123, Commented Oct 15, 2020 at 13:15
You could write the node.js data to a file and read it it with python. Keep the python process alive by checking if the file has changed. — MWO
– MWO, Commented Oct 15, 2020 at 13:16

balderman · Accepted Answer · 2020-10-15 13:09:59Z

1

Is there a better way to send pass data from Node.js to Python to proces realtime data?

You can use a python framework like Flask and expose an API that will do the pandas part. It will return the result to the node client.

answered Oct 15, 2020 at 13:09

balderman

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