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This recipe is the JavaScript client side of an overall recipe that shows how to do system monitoring using WebSockets, Python, Go (using websocketd), and JavaScript + HTML. The server side of the recipe (in Python, and using websocketd which is written in Go), is here:

http://code.activestate.com/recipes/578803-using-websocketd-with-python-for-web-based-system-/?in=user-4173351

The system monitoring example shows the system disk space info (total, used and free) using the Python psutil module.

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<!DOCTYPE html>
<html>
    <head>
        <title>
        Disk space monitoring with websocketd (Go) and psutil (Python).
        </title>
    </head>
    <body>
        <h3>
        Disk space monitoring with websocketd (Go) and psutil (Python).
        </h3>
        <p>
            <div id="log"></div>
        </p>
        <script>
            // helper function: log message to screen
            function log(msg) {
                document.getElementById('log').innerText += msg + '\n';
            }

            // setup websocket with callbacks
            var ws = new WebSocket('ws://localhost:8080/');
            ws.onopen = function() {
                log('CONNECT');
            };
            ws.onclose = function() {
                log('DISCONNECT');
            };
            ws.onmessage = function(event) {
                log('MESSAGE: ' + event.data);
            };
        </script>
    </body>
</html>

Please refer to this recipe for the server side of this example:

http://code.activestate.com/recipes/578803-using-websocketd-with-python-for-web-based-system-/?in=user-4173351

Run the server side first (as shown at the above link), and then open the code shown in this recipe you are reading now, in a WebSocket-enabled browser.

This post has more details:

http://jugad2.blogspot.in/2014/01/websocketd-and-python-for-system.html

1 comment

Dalooete 5 years, 5 months ago  # | flag

Hello, I've tried to implement this example https://account.activestate.com/signin/?_ga=1.90995225.2017638630.1466061820&next=https%3A%2F%2Fcode.activestate.com%2Frecipes%2F578806-javascript-websocket-client-for-python-go-websocke%2F, but I can't install websocketd, or I didn't understand it. When I run in my cmd this command websocketd --port=8080 python psutil_disk_usage.py, I have this issue: "websocketd" is not recognized as an internal or external command. I've tried to download an archive websocketd-0.2.12-windows_amd64.zip from here https://github.com/joewalnes/websocketd/releases, but I don't know if it's well. I have Windows64, I put the .exe file in the same folder where are psutil_disk_usage.py and psutil_disk_usage.html. I also run the .exe file, but no chance.

Thank you for you help,