parsing idlelog..log in Perl (was: historystats file format documentation)

Zdeněk Kedaj <[email protected]> writes:

> 2010/4/25 Joe Wells <[email protected]>
>
>     Sorry for being confusing.  The information you want is in the
>     “idlelog..log” file.  If you look for earlier postings on this mailing
>     list, you can find programs that process this data.
>
> Hm, but this file is in binary format which is quite hard to parse. Does it
> contain any more data than the historystats file?

It contains the start and stop time of each idle interval.

I remember posting Perl code that would parse it.  The format is not
complicated.  Each record is fixed length, and each field is a fixed
size at a fixed offset within each record.  Here is the relevant Perl
code that unpacks the entire file:

  # C: unsigned 8-bit integer (“c” is for “char”)
  # n: unsigned 16-bit integer in big-endian order (“n” is for “network” order)
  # N: unsigned 32-bit integer in big-endian order

  # 17 bytes total
  my $IdleLogRecordFormat = '
   n # size (should always be 15, encoded in bytes as 0 followed by 15)
   C # format version (should always be 2, encoded as the byte 2)
   N # begin time
   N # end idle time
   N # end time
   n # active time
  ';

  ...

  my $contents = get_file_contents ($file); # grab entire file as a single string
  my @all_record_fields = unpack ("($IdleLogRecordFormat)*", $contents);

After this code runs, each record takes 6 consecutive slots in
@all_record_fields.

I hope this helps.

-- 
Joe


-- 
Heriot-Watt University is a Scottish charity
registered under charity number SC000278.


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