Suggestion on a way to stream output from a watch command

[rkpatel33]

I am trying to setup a widget that will show continuous output from a Kubernetes watch command or log follow command:

kubectl get events --watch
kubectl logs -f -l app=main --all-containers

I am trying to use Python subprocess to capture these logs and then render them on a 2 sec refresh, but I am having trouble with figuring out how to implement this in a Widget. All the methods I've tried result in a loop where the process never ends waiting for the next line, so you never get to the end of the render() method to return a chunk of output.

[mwalkerr]

@rkpatel33 I haven't programmed in Python in a while, so take this with a grain of salt, but what I think you'd need to do is this: create a thread that reads from that process and writes to a queue (or buffer?). Then create a timer which reads from the queue if it's not empty and renders all the new content in the widget

[rkpatel33]

Thank you for the suggestion, I will look into that approach.

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On Mon, Feb 14, 2022 at 12:13 AM mwalkerr ***@***.***> wrote: @rkpatel33 <https://github.com/rkpatel33> I haven't programmed in Python in a while, so take this with a grain of salt, but what I think you'd need to do is this: create a thread that reads from that process and writes to a queue (or buffer?). Then create a timer which reads from the queue if it's not empty and renders all the new content in the widget — Reply to this email directly, view it on GitHub <#245 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA47TQLMFZTKBMZC3LO2NPLU3C2TBANCNFSM5NFIFH6Q> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[mwlayne]

Did you ever solve this issue? I am thinking about doing something similar

[sminot]

I just saw this and thought it might help.
https://github.com/Textualize/textual#timers-and-intervals
I can imagine your using a timer to periodically update the display from the stream.

[rkpatel33]

I did not, have not had a chance to return. I am using straight intervals for certain panes that are refreshing a finite set amount of data.

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On Mon, Mar 21, 2022 at 7:23 PM mwlayne ***@***.***> wrote: Did you ever solve this issue? I am thinking about doing something similar — Reply to this email directly, view it on GitHub <#245 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AA47TQMYEPUTE64HJBSSG33VBEVKNANCNFSM5NFIFH6Q> . You are receiving this because you were mentioned.Message ID: ***@***.***>