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Add ability to write capture stats to a file. #155

Merged
merged 2 commits into from
Dec 6, 2016
Merged

Add ability to write capture stats to a file. #155

merged 2 commits into from
Dec 6, 2016

Commits on Dec 6, 2016

  1. Add ability to write capture stats to a file. 

    With -s, periodically fetch capture stats from the inspector and write
them to the provided file.

Separate class StatsFileWriter handles the details. It does rely on a
timer + SIGALRM handler so you can only practically create a single
object, but it does keep the code/state separate.

The output format has a sample number, the set of current stats, a
delta with the difference from the prior sample, and the percentage of
events dropped during that sample.
    @mstemm
    mstemm committed Dec 6, 2016
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  2. Add ability to write "extra" stuff to stats file. 

    When run via scripts like run_performance_tests.sh, it's useful to
include extra info like the test being run and the specific program
variant to the stats file. So support that via the
environment. Environment keys starting with FALCO_STATS_EXTRA_XXX will
have the XXX and environment value added to the stats file.

It's undocumented as I doubt other programs will need this functionality
and it keeps the docs simpler.
    @mstemm
    mstemm committed Dec 6, 2016
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