Tailing files in sampler

[vcavallo]

Hello.

What is the recommended way to tail a file in sampler? Is this supported?

Thanks!

[vcavallo]

update:

this seems to be working..?

textboxes:
  - title: Some Title
    position: [[22, 20], [26, 11]]
    rate-ms: 100
    init: heroku logs -t                                     # this is the tailing command
    sample: stdout                                          # this was a stab in the dark
    border: false
    transform: echo $sample | cut -f 1 -d '#'   # the transform seems to work like this.

[sqshq]

If you just want to see a log rolling, you can do tail -n 50 every 100 ms (or heroku logs -n 50):

textboxes:
  - title: logs
    rate-ms: 100
    sample: tail -n 50 my.log

[vcavallo]

yup, that I get - which is running separate commands iteratively; but is there no way to stream a continuous output? thinking about services/commands where many calls are treated differently than one “tail -f” style command. or where the command itself takes some time to fire at first but then streams in real-time (as is the case with heroku logs)

On Sat, Aug 10, 2019 at 12:46 PM Alexander Lukyanchikov < ***@***.***> wrote: If you just want to see a log rolling, you can do tail -n 50 every 100 ms (or heroku logs -n 50): textboxes: - title: logs rate-ms: 100 sample: tail -n 50 my.log — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AAYNQ34NTYE3V3X7BDTJ4NTQD3WFLA5CNFSM4IJYMOLKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4ARBVY#issuecomment-520163543>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAYNQ34W72KYUFW4IMIRZ7LQD3WFLANCNFSM4IJYMOLA> .

-- Sent from a phone

[sqshq]

There is no such thing so far, and I wouldn't complicate things at this point. You concern regarding periodic sampling is performance?

[vcavallo]

I’m all for not complicating things. but yea i was mostly concerned with rate limits and the startup time of some periodic sampling commands. (again, the heroku logs example. takes a few variable moments to actually start returning anything. would probably miss results between samples)

On Sun, Aug 11, 2019 at 10:19 PM Alexander Lukyanchikov < ***@***.***> wrote: There is no such thing so far, and I wouldn't complicate things at this point. You concern regarding periodic sampling is performance? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AAYNQ3YD3IE44TDGECOTZS3QEDCEFA5CNFSM4IJYMOLKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4BOKII#issuecomment-520283425>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAYNQ36RDHYLOUSXG37PEBDQEDCEFANCNFSM4IJYMOLA> .

-- Sent from a phone

[sqshq]

I see. Yes, that makes sense. I'll think about it