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# Copyright (C) 2008-2009 Sun Microsystems, Inc. All rights reserved.
# Use is subject to license terms.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
# USA
use strict;
use lib 'lib';
use lib '../lib';
use DBI;
use Carp;
use Getopt::Long;
use Data::Dumper;
use GenTest;
use GenTest::Constants;
use GenTest::Grammar;
use GenTest::Properties;
use GenTest::Simplifier::Grammar;
use Time::HiRes;
#
# RQG grammar simplification with an oracle() function based on
# 1. RQG exit status codes (-> desired_status_codes)
# 2. expected RQG protocol output (-> expected_output)
# Hint: 2. will be not checked if 1. already failed
#
# You need to adjust parameters to your use case and environment.
# 1. Copy simplify-grammar_template.cfg to for example 1.cfg
# 2. Adjust the settings
# 2. perl util/simplify-grammar.pl --config 1.cfg
#
# This script is used to simplify grammar files to the smallest form
# that will still reproduce the desired outcome
# For the purpose, the GenTest::Simplifier::Grammar module provides
# progressively simple grammars, and we define an oracle() function
# that runs those grammars with the RQG and reports if the RQG returns
# the desired status code (usually something like
# STATUS_SERVER_CRASHED
#
# For more information, please see:
#
# http://forge.mysql.com/wiki/RandomQueryGeneratorSimplification
#
# get configuration
my $options = {};
GetOptions($options, 'config=s', 'trials=i','storage_prefix=s','expected_output=s@');
my $config = GenTest::Properties->new(
options => $options,
legal => ['desired_status_codes',
'expected_output',
'initial_grammar_file',
'mask',
'mask-level',
'grammar_flags',
'trials',
'initial_seed',
'search_var_size',
'rqg_options',
'vardir_prefix',
'storage_prefix'],
required=>['rqg_options',
'initial_grammar_file',
'vardir_prefix',
'storage_prefix'],
defaults => {expected_output => [],
desired_status_codes => [+STATUS_ANY_ERROR]}
);
# Dump settings
say("SIMPLIFY RQG GRAMMAR BASED ON EXPECTED CONTENT WITHIN SOME FILE");
say("---------------------------------------------------------------");
$config->printProps;
say("---------------------------------------------------------------");
## Calculate mysqld and rqg options
my $mysqlopt = $config->genOpt('--mysqld=--', $config->rqg_options->{mysqld});
## The one below is a hack.... Need support for nested options like these
delete $config->rqg_options->{mysqld};
my $rqgoptions = $config->genOpt('--', 'rqg_options');
# Determine some runtime parameter, check parameters, ....
my $run_id = time();
say("The ID of this run is $run_id.");
my $initial_grammar;
if ($config->property('mask') > 0) {
my $initial_grammar_obj = GenTest::Grammar->new( 'grammar_file' => $config->initial_grammar_file );
my $top_grammar = $initial_grammar_obj->topGrammar($config->property('mask-level'), "query", "query_init");
my $masked_top = $top_grammar->mask($config->property('mask'));
$initial_grammar = $initial_grammar_obj->patch($masked_top);
} else {
open(INITIAL_GRAMMAR, $config->initial_grammar_file) or croak "Unable to open initial_grammar_file '" . $config->initial_grammar_file . "' : $!";
read(INITIAL_GRAMMAR, $initial_grammar , -s $config->initial_grammar_file);
close(INITIAL_GRAMMAR);
}
if ( ! -d $config->vardir_prefix ) {
croak("vardir_prefix '" . $config->vardir_prefix . "' is not an existing directory");
}
# Calculate a unique vardir (use $MTR_BUILD_THREAD or $run_id)
my $vardir = $config->vardir_prefix . '/var_' . $run_id;
mkdir ($vardir);
push my @mtr_options, "--vardir=$vardir";
if ( ! -d $config->storage_prefix) {
croak("storage_prefix '" . $config->storage_prefix . "' is not an existing directory");
}
my $storage = $config->storage_prefix.'/'.$run_id;
say "Storage is $storage";
mkdir ($storage);
my $errfile = $vardir . '/log/master.err';
my $iteration;
my $good_seed = $config->initial_seed;
my $simplifier = GenTest::Simplifier::Grammar->new(
grammar_flags => $config->grammar_flags,
oracle => sub {
$iteration++;
my $oracle_grammar = shift;
my $current_grammar = $storage . '/' . $iteration . '.yy';
open (GRAMMAR, ">$current_grammar")
or croak "unable to create $current_grammar : $!";
print GRAMMAR $oracle_grammar;
close (GRAMMAR);
foreach my $trial (1..$config->trials) {
say("run_id = $run_id; iteration = $iteration; trial = $trial");
# $current_seed -- The seed value to be used for the next run.
# The test results of many grammars are quite sensitive to the
# seed value.
# 1. Run the first trial on the initial grammar with
# $config->initial_seed . This should raise the chance
# that the initial oracle check passes.
# 2. Run the first trial on a just simplified grammar with the
# last successfull seed value. In case the last
# simplification did remove some random determined we
# should have a bigger likelihood to reach the expected
# result.
# 3. In case of "threads = 1" it turned out that after a minor
# simplification the desired bad effect disappeared
# sometimes on the next run with the same seed value
# whereas a different seed value was again
# successful. Therefore we manipulate the seed value. In
# case of "threads > 1" this manipulation might be not
# required, but it will not make the conditions worse.
my $current_seed = $good_seed - 1 + $trial;
my $current_rqg_log = $storage . '/' . $iteration . '-'. $trial . '.log';
my $start_time = Time::HiRes::time();
# Note(mleich): In case of "threads = 1" it turned out that
# after a minor simplification the desired bad effect
# disappeared sometimes on the next run with the same
# seed value whereas a different seed value was again
# successful. Therefore we manipulate the seed value. In
# case of "threads > 1" this manipulation might be not
# required, but it will not make the conditions worse.
my $rqgcmd =
"perl runall.pl $rqgoptions $mysqlopt ".
"--grammar=$current_grammar ".
"--vardir=$vardir ".
"--seed=$current_seed >$current_rqg_log 2>&1";
say($rqgcmd);
my $rqg_status = system($rqgcmd);
$rqg_status = $rqg_status >> 8;
my $end_time = Time::HiRes::time();
my $duration = $end_time - $start_time;
say("rqg_status = $rqg_status; duration = $duration");
return ORACLE_ISSUE_NO_LONGER_REPEATABLE
if $rqg_status == STATUS_ENVIRONMENT_FAILURE;
foreach my $desired_status_code (@{$config->desired_status_codes}) {
if (($rqg_status == $desired_status_code) ||
(($rqg_status != 0) && ($desired_status_code == STATUS_ANY_ERROR))) {
# "backtrace" output (independend of server crash
# or RQG kills the server) is in $current_rqg_log
open (my $my_logfile,'<'.$current_rqg_log)
or croak "unable to open $current_rqg_log : $!";
# If open (above) did not fail than size
# determination must be successful.
my @filestats = stat($current_rqg_log);
my $filesize = $filestats[7];
my $offset = $filesize - $config->search_var_size;
# Of course read fails if $offset < 0
$offset = 0 if $offset < 0;
read($my_logfile, my $rqgtest_output, $config->search_var_size, $offset );
close ($my_logfile);
# Debug print("$rqgtest_output");
# Every element of @expected_output must be found
# in $rqgtest_output.
my $success = 1;
foreach my $expected_output (@{$config->expected_output}) {
if ($rqgtest_output =~ m{$expected_output}sio) {
say ("###### Found pattern: $expected_output ######");
} else {
say ("###### Not found pattern: $expected_output ######");
$success = 0;
last;
}
}
if ( $success ) {
say ("###### SUCCESS with $current_grammar ######");
$good_seed = $current_seed;
return ORACLE_ISSUE_STILL_REPEATABLE;
}
} # End of check if the output matches given string patterns
} # End of loop over desired_status_codes
if ($rqg_status == STATUS_OK) {
# Run with exit status 0 -> RQG output is not of interest
unlink($current_rqg_log);
}
} # End of loop over the trials
return ORACLE_ISSUE_NO_LONGER_REPEATABLE;
}
);
my $simplified_grammar = $simplifier->simplify($initial_grammar);
print "Simplified grammar:\n\n$simplified_grammar;\n\n" if defined $simplified_grammar;
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