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#!/usr/bin/perl
=head1 NAME
dbilogstrip - filter to normalize DBI trace logs for diff'ing
=head1 SYNOPSIS
Read DBI trace file C<dbitrace.log> and write out a stripped version to C<dbitrace_stripped.log>
dbilogstrip dbitrace.log > dbitrace_stripped.log
Run C<yourscript.pl> twice, each with different sets of arguments, with
DBI_TRACE enabled. Filter the output and trace through C<dbilogstrip> into a
separate file for each run. Then compare using diff. (This example assumes
you're using a standard shell.)
DBI_TRACE=2 perl yourscript.pl ...args1... 2>&1 | dbilogstrip > dbitrace1.log
DBI_TRACE=2 perl yourscript.pl ...args2... 2>&1 | dbilogstrip > dbitrace2.log
diff -u dbitrace1.log dbitrace2.log
=head1 DESCRIPTION
Replaces any hex addresses, e.g, C<0x128f72ce> with C<0xN>.
Replaces any references to process id or thread id, like C<pid#6254> with C<pidN>.
So a DBI trace line like this:
-> STORE for DBD::DBM::st (DBI::st=HASH(0x19162a0)~0x191f9c8 'f_params' ARRAY(0x1922018)) thr#1800400
will look like this:
-> STORE for DBD::DBM::st (DBI::st=HASH(0xN)~0xN 'f_params' ARRAY(0xN)) thrN
=cut
use strict;
while (<>) {
# normalize hex addresses: 0xDEADHEAD => 0xN
s/ \b 0x [0-9a-f]+ /0xN/gx;
# normalize process and thread id number
s/ \b (pid|tid|thr) \W? \d+ /${1}N/gx;
} continue {
print or die "-p destination: $!\n";
}