[dev] golang: time.Tick() and ntp

From: Markus Teich <markus.teich_AT_stusta.mhn.de>
Date: Wed, 8 Oct 2014 12:23:59 +0200


I am using a status bar script written in go[0]. Recently I have noticed two
problems related to the time display, but first here is the relevant part of the

        for clock := range time.Tick(time.Second) {
                // …
                clock.Format("Mon 02 15:04:05")
                // …

Now the first problem occured when I was travelling to another timezone and
updated my timezone information. Since clock only get's initialized once, we
don't catch the new timezone info and the displayed time stays in the old
timezone until the script is restarted.

The second problem is when using ntp to synchronize the clock. In this case the
channel provided by time.Tick() stops to send on that channel and therefore the
whole loop stops and the status bar is not updated anymore.

Can you help me with an idiomatic solution for these two problems? The first one
can be solved by using „time.Now()“ instead of „clock“ inside the loop, but I'm
stuck with the second one since I don't see a way to detect this case easily.
Maybe I could introduce another timeout channel which fires after two seconds on
a monotonic clock?

Thanks for your suggestions.


[0] https://github.com/schachmat/gods
Received on Wed Oct 08 2014 - 12:23:59 CEST

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