Show HN: SharePad.io – A collaborative code editor and compiler

Post by yufw » Fri, Jan 01, 2021, 6:33 PM UTC

nulptr wrote: post #18

Some starter code for each language that prints hello world would be nice. ALso, you can look to coderpad.io for other features to add for fun.

Post by yufw » Fri, Jan 01, 2021, 6:51 PM UTC

thenanyu wrote: post #23

yufw wrote: post #2

Happy New Year! This is my first web dev side project and it's in early stage. As an interviewer in the tech industry, I often find myself cannot spot that subtle bug in candidates' code during phone screening, so I build this website which lets me do collaborative editing and also run the code. You may find it useful too. Please help try it out and provide some feedback. No registration is required (because I have y…

An engineer on my team years ago felt the same as you and built his own solution for us to use during interview, eventually spinning it into a very successful business. Check out coderpad.io if you wanna get some inspiration. They took a similar technical approach as you described, at least for the first versions.

Post by yufw » Sat, Jan 02, 2021, 12:55 AM UTC

mdaniel wrote: post #25

yufw wrote: post #15

Earlier quoted context omitted.

No, the code is executed in docker containers hosted on Azure VM.

Apologies for doing this "in public," but the About page has no contact info, nor does your HN profile You will want to /dev/null the IMDS ( https://docs.microsoft.com/en-us/azure/virtual-machines/linu... ); your setup didn't appear immediately exploitable, but I am also not an experienced Azure escape artist: https://sharepad.io/p/whno49w

Post by maxmcd » Sat, Jan 02, 2021, 1:42 AM UTC

    import urllib.request
    import json
    import threading

    def do_request():
        data = {"lang":"python", "code": open(__file__).read(), "stdin": ""}
        req = urllib.request.Request(
            "https://www.sharepad.io/run", 
            data=json.dumps(data).encode('utf-8'), 
            headers={
                'Content-Type': 'application/json'
            }
        )

        f = urllib.request.urlopen(req)
        print(f.read().decode('utf-8'))
    x = threading.Thread(target=do_request)
    x.start()
    do_request()
    x.join()

Post by alex-wallish » Sat, Jan 02, 2021, 3:05 AM UTC

yufw wrote: post #21

alex-wallish wrote: post #20

How are you handling timeouts and forks? The following to snippets have different results: #include int main() { while(1){ fork(); } return 1; } #include int main() { while(1){ } return 1; } The second snippet times out properly, but the first does not.

I have running time limit on the containers. The first snippet is a fork bomb and will cause the container to run out of memory before the timeout. It does terminate since I have set a 256M memory limit. However, it is not sending the correct response in this case and the message in the output tab is not updated properly. Fork works just fine, https://sharepad.io/p/aBn5Oxu