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Add fingerprint_md5 and preserve_embedded_numbers flags to QueryRewriter, used in fingerprint() to handle customer's requirements.

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This commit is contained in:
Daniel Nichter
2012-03-26 10:45:46 -06:00
parent 240062f847
commit a81d25c489
2 changed files with 83 additions and 5 deletions
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28
lib/QueryRewriter.pm
View File

@@ -175,10 +175,30 @@ sub fingerprint {
$query =~ s/\\["']//g; # quoted strings
$query =~ s/".*?"/?/sg; # quoted strings
$query =~ s/'.*?'/?/sg; # quoted strings
# This regex is extremely broad in its definition of what looks like a
# number. That is for speed.
$query =~ s/[0-9+-][0-9a-f.xb+-]*/?/g;# Anything vaguely resembling numbers
$query =~ s/[xb.+-]\?/?/g; # Clean up leftovers
# MD5 checksums which are always 32 hex chars
if ( $self->{fingerprint_md5} ) {
$query =~ s/([._-])[a-f0-9]{32}/$1?/g;
}
# Things resembling numbers/hex.
if ( !$self->{preserve_embedded_numbers} ) {
# For speed, this regex is extremely broad in its definition
# of what looks like a number.
$query =~ s/[0-9+-][0-9a-f.xb+-]*/?/g;
}
else {
$query =~ s/\b[0-9+-][0-9a-f.xb+-]*/?/g;
}
# Clean up leftovers
if ( $self->{fingerprint_md5} ) {
$query =~ s/[xb+-]\?/?/g;
}
else {
$query =~ s/[xb.+-]\?/?/g;
}
$query =~ s/\A\s+//; # Chop off leading whitespace
chomp $query; # Kill trailing whitespace
$query =~ tr[ \n\t\r\f][ ]s; # Collapse whitespace

60
t/lib/QueryRewriter.t
View File

@@ -10,7 +10,7 @@ BEGIN {
use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use Test::More tests => 266;
use Test::More tests => 271;
use QueryRewriter;
use QueryParser;
@@ -349,6 +349,64 @@ is(
"Fingerprint LOAD DATA INFILE"
);
# fingerprint MD5 checksums, 32 char hex strings. This is a
# special feature used by pt-fingerprint.
$qr = new QueryRewriter(
QueryParser => $qp,
fingerprint_md5 => 1,
);
is(
$qr->fingerprint(
"SELECT * FROM db.fbc5e685a5d3d45aa1d0347fdb7c4d35_temp where id=1"
),
"select * from db.?_temp where id=?",
"Fingerprint db.MD5_tbl"
);
is(
$qr->fingerprint(
"SELECT * FROM db.temp_fbc5e685a5d3d45aa1d0347fdb7c4d35 where id=1"
),
"select * from db.temp_? where id=?",
"Fingerprint db.tbl_MD5"
);
$qr = new QueryRewriter(
QueryParser => $qp,
fingerprint_md5 => 1,
preserve_embedded_numbers => 1,
);
is(
$qr->fingerprint(
"SELECT * FROM db.fbc5e685a5d3d45aa1d0347fdb7c4d35_temp where id=1"
),
"select * from db.?_temp where id=?",
"Fingerprint db.MD5_tbl (with preserve_embedded_numbers)"
);
is(
$qr->fingerprint(
"SELECT * FROM db.temp_fbc5e685a5d3d45aa1d0347fdb7c4d35 where id=1"
),
"select * from db.temp_? where id=?",
"Fingerprint db.tbl_MD5 (with preserve_embedded_numbers)"
);
$qr = new QueryRewriter(
QueryParser => $qp,
preserve_embedded_numbers => 1,
);
is(
$qr->fingerprint(
"SELECT * FROM prices.rt_5min where id=1"
),
"select * from prices.rt_5min where id=?",
"Fingerprint db.tbl<number>name (preserve number)"
);
# #############################################################################
# convert_to_select()
# #############################################################################