golang context package explained: the package that changed concurrency forever

In this video we go over a visualization of how the context package works in golang.
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[@kantancoding]

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[@user-tw8wb1id3l]

Thanks mate. I've enjoyed your video series on concurrency in GO. Nice and clear explanation. Very helpful. Keep on the good work.

[@kantancoding]

Hey! Thanks for the encouragement. I’m glad you enjoyed it 😊

[@folklinoff]

Amazingly structured comprehensive video! Thank you very much

[@kantancoding]

Thank you! Happy to help 😊

[@defnd3r]

Glad you're back to making Go videos man... They're super useful

[@kantancoding]

Thank you! More to come!

[@sinahassani9880]

This explanation is worth paying time for

[@kantancoding]

Thank you! I’m glad it helped 🙂

[@brandon_wallace]

Excellent!

[@kantancoding]

Glad you liked it!

[@ShadwTrooper]

Super helpful. Thanks!

[@kantancoding]

Happy to help 🙂

[@marioluigi2995]

hey man, welcome back, I'll watch your vid.

[@kantancoding]

Thank you for watching! More to come 😊

[@LeviElekes]

🙏

[@aamirshekh934]

can you do a video on ticker package and go sarama package. Both of them doesn't have any good resources on youtube.

[@kantancoding]

not sure at the moment but I will keep it in mind! ☺️

[@user-pc7bv8vk4p]

Sir upload go tutorial for beginners

[@kantancoding]

Hmm I have quite a few geared towards beginners. Is there anything specific you want to see?

[@user-pc7bv8vk4p]

@@kantancoding yes, I am beginner in programming. Golang is my first programming language

[@kantancoding]

Introduction to Programming Using Go
ruclips.net/video/08Blkpo1F8I/видео.html

[@Porumb007]

Good explanation. Do you really need to duplicate the code for ctx cancel handling? Can't you have it in a separate function? Your function naming in the example is kind of bad.

[@kantancoding]

Thanks! Happy to help 🙂

[@stupidfilip23]

hiii, we missed you

[@kantancoding]

Hello!! Me too!!

[@dawnrazor]

Great video, but what happens when you DO want to cancel a parent context from a child. I have this exact scenario and in this case I pass in the parents cancel to the child gr. this works fine but this seems to be going against the grain. How do you cancel the parent without passing cancel func? What is wrong with this?

[@kantancoding]

I can’t think of any valid scenario where you’d cancel the parent from a child goroutine. I’d say the fact that you want/need to do this points out a fundamental design flaw in your application.
I can help more if you tell me WHY you feel it is necessary to cancel the parent from the child.

[@dawnrazor]

@@kantancoding great thanks. I knew it was wrong but I couldn’t figure out how to fix it properly. I have designed a worker pool. The worker pool exposes an optional output channel that the client can read from for results. But if the client doesn’t define a consumer for the channel, then the pool will lockup. So I decided to introduce a feature that would timeout and allow the pool exit gracefully. I do this by allowing the worker to cancel the parent context so the whole pool including other workers to exit gracefully. Only the worker knows when the timeout occurs not the parent. How can I fix this? (gh/snivilised/lorax/boost/issues/68)

[@kantancoding]

@@dawnrazorif you’re just using a timeout mechanism, just set the timeout in the context that you pass from the parent to the children using WithTimeout() (I explained how to use it in the video). Hope that helps!

[@dawnrazor]

@@kantancoding hi again, actually I don’t think your approach will work and the reason is this. The worker is running a task and there is no way to know how long the task will take. So what value do you set for the timeout in the parent context. There is no sensible value that you could come up with. And besides, the timer should only start at the point when the worker has attempted to sent to the output channel. Am I wrong about this?

[@dawnrazor]

@@kantancoding just wanna say thanks for making me realise that trying to cancel a parent from a child was totally wrong. I’m junking my entire worker pool and starting again with a better design

[@NigelTatschner]

You alllll get a context 😂

[@kantancoding]

😂🤣

[@rishirajrao5337]

Honest feedback, it was bit verbose and was lacking clarity unlike other tutorials. Thanks anyway for the effort.

[@kantancoding]

Thanks for watching! 🙂