# This program is copyright 2009-2011 Percona Ireland Ltd.
# Feedback and improvements are welcome.
#
# THIS PROGRAM IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#
# 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; OR the Perl Artistic License.  On UNIX and similar
# systems, you can issue `man perlgpl' or `man perlartistic' to read these
# licenses.
#
# 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., 59 Temple
# Place, Suite 330, Boston, MA  02111-1307  USA.
# ###########################################################################
# PerconaTest package
# ###########################################################################
{
# Package: PerconaTest
# PerconaTest is a collection of helper-subs for Percona Toolkit tests.
# Any file arguments (like no_diff() $expected_output) are relative to
# PERCONA_TOOLKIT_BRANCH.  So passing "commont/t/samples/foo" means
# "PERCONA_TOOLKIT_BRANCH/common/t/samples/foo".  Do not BAIL_OUT() because
# this terminates the *entire* test process; die instead.  All
# subs are exported by default, so is the variable $trunk, so there's
# no need to import() in the test scripts.
package PerconaTest;

use strict;
use warnings FATAL => 'all';
use English qw(-no_match_vars);
use constant PTDEVDEBUG => $ENV{PTDEVDEBUG} || 0;

use Carp qw(croak);

use Test::More;
use Time::HiRes qw(sleep time);
use File::Temp qw(tempfile);
use POSIX qw(signal_h);
use Data::Dumper;

require Exporter;
our @ISA         = qw(Exporter);
our %EXPORT_TAGS = ();
our @EXPORT_OK   = qw();
our @EXPORT      = qw(
   output
   full_output
   load_data
   load_file
   slurp_file
   parse_file
   wait_until
   wait_for
   wait_until_replica_running
   test_log_parser
   test_protocol_parser
   test_packet_parser
   no_diff
   throws_ok
   remove_traces
   test_bash_tool
   verify_test_data_integrity
   $trunk
   $dsn_opts
   $sandbox_version
   $can_load_data
   $test_diff
   $source_name
   $source_status
   $source_reset
   $source_change
   $replica_name
);

our $trunk = $ENV{PERCONA_TOOLKIT_BRANCH};

our $sandbox_version = '';
eval {
   chomp(my $v = `$trunk/sandbox/test-env version 2>/dev/null`);
   $sandbox_version = $v if $v;
};

our $source_name = 'source';
our $source_status = 'binary log';
our $source_reset = 'binary logs and gtids';
our $source_change = 'replication source';
our $replica_name = 'replica';
if ( $sandbox_version lt '8.1' || ( $ENV{FORK} || "" eq 'mariadb' ) ) {
   $source_name = 'master';
   $source_status = 'master';
   $source_reset = 'master';
   $source_change = 'master';
   $replica_name = 'slave';
}

our $can_load_data = can_load_data();

our $test_diff = '';

our $dsn_opts = [
   {
      key  => 'A',
      desc => 'Default character set',
      dsn  => 'charset',
      copy => 1,
   },
   {
      key  => 'D',
      desc => 'Database to use',
      dsn  => 'database',
      copy => 1,
   },
   {
      key  => 'F',
      desc => 'Only read default options from the given file',
      dsn  => 'mysql_read_default_file',
      copy => 1,
   },
   {
      key  => 'h',
      desc => 'Connect to host',
      dsn  => 'host',
      copy => 1,
   },
   {
      key  => 'p',
      desc => 'Password to use when connecting',
      dsn  => 'password',
      copy => 1,
   },
   {
      key  => 'P',
      desc => 'Port number to use for connection',
      dsn  => 'port',
      copy => 1,
   },
   {
      key  => 'S',
      desc => 'Socket file to use for connection',
      dsn  => 'mysql_socket',
      copy => 1,
   },
   {
      key  => 't',
      desc => 'Table',
      dsn  => undef,
      copy => 1,
   },
   {
      key  => 'u',
      desc => 'User for login if not current user',
      dsn  => 'user',
      copy => 1,
   },
   {
      key  => 's',
      desc => 'Use SSL',
      dsn  => 'mysql_ssl',
      copy => 1,
   },
];

# Runs code, captures and returns its output.
# Optional arguments:
#   * file    scalar: capture output to this file (default none)
#   * stderr  scalar: capture STDERR (default no)
#   * die     scalar: die if code dies (default no)
#   * trf     coderef: pass output to this coderef (default none)
sub output {
   my ( $code, %args ) = @_;
   die "I need a code argument" unless $code;
   my ($file, $stderr, $die, $trf) = @args{qw(file stderr die trf)};

   my $output = '';
   {
      if ( $file ) {
         open *output_fh, '>', $file
            or die "Cannot open file $file: $OS_ERROR";
      }
      else {
         open *output_fh, '>', \$output
            or die "Cannot capture output to variable: $OS_ERROR";
      }
      local *STDOUT = *output_fh;

      # If capturing STDERR we must dynamically scope (local) STDERR
      # in the outer scope of the sub.  If we did,
      #   if ( $args{stderr} ) { local *STDERR; ... }
      # then STDERR would revert to its original value outside the if
      # block.
      local *STDERR     if $args{stderr};  # do in outer scope of this sub
      *STDERR = *STDOUT if $args{stderr};

      eval { $code->() };
      if ( $EVAL_ERROR ) {
         die $EVAL_ERROR if $die;
         warn $EVAL_ERROR;
      }

      close *output_fh;
   }

   select STDOUT;

   # Possible transform output before returning it.  This doesn't work
   # if output was captured to a file.
   $output = $trf->($output) if $trf;

   return $output;
}

# Load data from file and removes spaces.  Used to load tcpdump dumps.
sub load_data {
   my ( $file ) = @_;
   $file = "$trunk/$file";
   open my $fh, '<', $file or croak "Cannot open $file: $OS_ERROR";
   my $contents = do { local $/ = undef; <$fh> };
   close $fh;
   (my $data = join('', $contents =~ m/(.*)/g)) =~ s/\s+//g;
   return $data;
}

# Slurp file and return its entire contents.
sub load_file {
   my ( $file, %args ) = @_;
   $file = "$trunk/$file";
   my $contents = slurp_file($file);
   chomp $contents if $args{chomp_contents};
   return $contents;
}

sub slurp_file {
   my ($file) = @_;
   open my $fh, "<", $file or croak "Cannot open $file: $OS_ERROR";
   my $contents = do { local $/ = undef; <$fh> };
   close $fh;
   return $contents;
}

sub parse_file {
   my ( $file, $p, $ea ) = @_;
   $file = "$trunk/$file";
   my @e;
   eval {
      open my $fh, "<", $file or die "Cannot open $file: $OS_ERROR";
      my %args = (
         next_event => sub { return <$fh>;    },
         tell       => sub { return tell $fh; },
         fh         => $fh,
      );
      while ( my $e = $p->parse_event(%args) ) {
         push @e, $e;
         $ea->aggregate($e) if $ea;
      }
      close $fh;
   };
   die $EVAL_ERROR if $EVAL_ERROR;
   return \@e;
}

# Wait until code returns true.
sub wait_until {
   my ( $code, $t, $max_t ) = @_;
   $t     ||= .20;
   $max_t ||= 30;

   my $slept = 0;
   while ( $slept <= $max_t ) {
      return 1 if $code->();
      PTDEVDEBUG && _d('wait_until sleeping', $t);
      sleep $t;
      $slept += $t;
      PTDEVDEBUG && _d('wait_until slept', $slept, 'of', $max_t);
   }
   return 0;
}

# Wait t seconds for code to return.
sub wait_for {
   my ( $code, $t ) = @_;
   $t ||= 0;
   my $mask   = POSIX::SigSet->new(&POSIX::SIGALRM);
   my $action = POSIX::SigAction->new(
      sub { die },
      $mask,
   );
   my $oldaction = POSIX::SigAction->new();
   sigaction(&POSIX::SIGALRM, $action, $oldaction);
   eval {
      alarm $t;
      $code->();
      alarm 0;
   };
   if ( $EVAL_ERROR ) {
      # alarm was raised
      return 1;
   }
   return 0;
}

sub wait_for_table {
   my ($dbh, $tbl, $where) = @_;
   my $sql = "SELECT 1 FROM $tbl" . ($where ? " WHERE $where LIMIT 1" : "");
   return wait_until(
      sub {
         my $r;
         eval { $r = $dbh->selectrow_arrayref($sql); };
         if ( $EVAL_ERROR ) {
            PTDEVDEBUG && _d('Waiting on', $dbh, 'for table', $tbl,
               'error:', $EVAL_ERROR);
            return 0;
         }
         if ( $where && (!$r || !scalar @$r) ) {
            PTDEVDEBUG && _d('Waiting on', $dbh, 'for table', $tbl,
               'WHERE', $where);
            return 0;
         }
         return 1;
      },
   );
}

sub wait_for_files {
   my (@files) = @_;
   return wait_until(
      sub {
         foreach my $file (@files) {
            if ( ! -f $file ) {
               PTDEVDEBUG && _d('Waiting for file', $file);
               return 0;
            }
         }
         return 1;
      },
   );
}

sub wait_for_sh {
   my ($cmd) = @_;
   return wait_until(
      sub {
         my $retval = system("$cmd 2>/dev/null");
         return $retval >> 8 == 0 ? 1 : 0;
      }
   );
};

sub kill_program {
   my (%args) = @_;

   my $pid_file = $args{pid_file};
   my $pid      = $args{pid};

   if ( $pid_file ) {
      chomp($pid = `cat $pid_file 2>/dev/null`);
   }

   if ( $pid ) {
      PTDEVDEBUG && _d('Killing PID', $pid);
      kill(15, $pid);
      wait_until(
         sub { my $is_alive = kill(0, $pid);  return !$is_alive; },
         1.5,  # sleep between tries
         15,   # max time to try
      );
      if ( kill(0, $pid) ) {
         warn "PID $pid did not die; using kill -9\n";
         kill(9, $pid);
      }
   }
   else {
      PTDEVDEBUG && _d('No PID to kill');
   }

   if ( $pid_file && -f $pid_file ) {
      PTDEVDEBUG && _d('Removing PID file', $pid_file);
      unlink $pid_file;
   }
}

sub not_running {
   my ($cmd) = @_;
   PTDEVDEBUG && _d('Wait until not running:', $cmd);
   return wait_until(
      sub {
         my $output = `ps x | grep -v grep | grep "$cmd"`;
         PTDEVDEBUG && _d($output);
         return 1 unless $output;
         return 0;
      }
   );
}

sub _read {
   my ( $fh ) = @_;
   return <$fh>;
}

sub test_log_parser {
   my ( %args ) = @_;
   foreach my $arg ( qw(parser file) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $p = $args{parser};

   # Make sure caller isn't giving us something we don't understand.
   # We could ignore it, but then caller might not get the results
   # they expected.
   map  { die "What is $_ for?"; }
   grep { $_ !~ m/^(?:parser|misc|file|result|num_events|oktorun)$/ }
   keys %args;

   my $file = "$trunk/$args{file}";
   my @e;
   eval {
      open my $fh, "<", $file or die "Cannot open $file: $OS_ERROR";
      my %parser_args = (
         next_event => sub { return _read($fh); },
         tell       => sub { return tell($fh);  },
         fh         => $fh,
         misc       => $args{misc},
         oktorun    => $args{oktorun},
      );
      while ( my $e = $p->parse_event(%parser_args) ) {
         push @e, $e;
      }
      close $fh;
   };

   # sort the array just to make this testeable.
   @e = sort { $a->{pos_in_log} <=> $b->{pos_in_log} } @e;

   my ($base_file_name) = $args{file} =~ m/([^\/]+)$/;
   is(
      $EVAL_ERROR,
      '',
      "$base_file_name: no errors"
   );

   if ( defined $args{result} ) {
      is_deeply(
         \@e,
         $args{result},
         "$base_file_name: results"
      ) or diag(Dumper(\@e));
   }

   if ( defined $args{num_events} ) {
      is(
         scalar @e,
         $args{num_events},
         "$base_file_name: $args{num_events} events"
      );
   }

   return \@e;
}

sub test_protocol_parser {
   my ( %args ) = @_;
   foreach my $arg ( qw(parser protocol file) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $parser   = $args{parser};
   my $protocol = $args{protocol};

   # Make sure caller isn't giving us something we don't understand.
   # We could ignore it, but then caller might not get the results
   # they expected.
   map { die "What is $_ for?"; }
   grep { $_ !~ m/^(?:parser|protocol|misc|file|result|num_events|desc)$/ }
   keys %args;

   my $file = "$trunk/$args{file}";
   my ($base_file_name) = $args{file} =~ m/([^\/]+)$/;
   my @e;
   eval {
      open my $fh, "<", $file or die "Cannot open $file: $OS_ERROR";
      my %parser_args = (
         next_event => sub { return _read($fh); },
         tell       => sub { return tell($fh);  },
         misc       => $args{misc},
      );
      while ( my $p = $parser->parse_event(%parser_args) ) {
         my $e = $protocol->parse_event(%parser_args, event => $p);
         push @e, $e if $e;
      }
      close $fh;
   };

   is(
      $EVAL_ERROR,
      '',
      "$base_file_name: no perl errors"
   );

   if ( defined $args{result} ) {
      is_deeply(
         \@e,
         $args{result},
         "$base_file_name: " . ($args{desc} || "results")
      ) or diag(Dumper(\@e));
   }

   if ( defined $args{num_events} ) {
      is(
         scalar @e,
         $args{num_events},
         "$base_file_name: $args{num_events} events"
      );
   }

   return \@e;
}

sub test_packet_parser {
   my ( %args ) = @_;
   foreach my $arg ( qw(parser file) ) {
      die "I need a $arg argument" unless $args{$arg};
   }
   my $parser   = $args{parser};

   # Make sure caller isn't giving us something we don't understand.
   # We could ignore it, but then caller might not get the results
   # they expected.
   map { die "What is $_ for?"; }
   grep { $_ !~ m/^(?:parser|misc|file|result|desc|oktorun)$/ }
   keys %args;

   my $file = "$trunk/$args{file}";
   my @packets;
   open my $fh, '<', $file or die "Cannot open $file: $OS_ERROR";
   my %parser_args = (
      next_event => sub { return _read($fh); },
      tell       => sub { return tell($fh);  },
      misc       => $args{misc},
      oktorun    => $args{oktorun},
   );
   while ( my $packet = $parser->parse_event(%parser_args) ) {
      push @packets, $packet;
   }

   # raw_packet is the actual dump text from the file.  It's used
   # in MySQLProtocolParser but I don't think we need to double-check
   # it here.  It will make the results very long.
   foreach my $packet ( @packets ) {
      delete $packet->{raw_packet};
   }

   if ( !is_deeply(
         \@packets,
         $args{result},
         "$args{file}" . ($args{desc} ? ": $args{desc}" : '')
      ) ) {
      diag(Dumper(\@packets));
   }

   return;
}

# no_diff() compares the STDOUT output of a cmd or code to expected output.
# Returns true if there are no differences between the two outputs,
# else returns false.  Dies if the cmd/code dies.  Does not capture STDERR.
# Args:
#   * cmd                 scalar or coderef: if cmd is a scalar then the
#                         cmd is ran via the shell.  if it's a coderef then
#                         the code is ran.  the latter is preferred because
#                         it generates test coverage.
#   * expected_output     scalar: file name relative to PERCONA_TOOLKIT_BRANCH
#   * args                hash: (optional) may include
#       update_sample            overwrite expected_output with cmd/code output
#       keep_output              keep last cmd/code output file
#       transform_result         transform the code to be compared but do not
#                                reflect these changes on the original file
#                                if update_sample is passed in
#       transform_sample         similar to the above, but with the sample
#                                file
#   *   trf                      transform cmd/code output before diff
# The sub dies if cmd or code dies.  STDERR is not captured.
sub no_diff {
   my ( $cmd, $expected_output, %args ) = @_;
   die "I need a cmd argument" unless $cmd;
   die "I need an expected_output argument" unless $expected_output;

   if ( $args{full_path} ) {
      die "$expected_output does not exist" unless -f $expected_output;
   }
   else {
      die "$expected_output does not exist" unless -f "$trunk/$expected_output";
      $expected_output = "$trunk/$expected_output";
   }

   my $tmp_file      = '/tmp/percona-toolkit-test-output.txt';
   my $tmp_file_orig = '/tmp/percona-toolkit-test-output-original.txt';

   if ( my $sed_args = $args{sed_out} ) {
      `cat $expected_output | sed $sed_args > /tmp/pt-test-outfile-trf`;
      $expected_output = "/tmp/pt-test-outfile-trf";
   }
   # Determine cmd type and run it.
   if ( ref $cmd eq 'CODE' ) {
      output($cmd, file => $tmp_file);
   }
   elsif ( $args{cmd_output} ) {
      # Copy cmd output to tmp file so we don't with the original.
      open my $tmp_fh, '>', $tmp_file or die "Cannot open $tmp_file: $OS_ERROR";
      print $tmp_fh $cmd;
      close $tmp_fh;
   }
   elsif ( -f $cmd ) {
      `cp $cmd $tmp_file`;
   }
   else {
      `$cmd > $tmp_file`;
   }

   # Do optional arg stuff.
   `cp $tmp_file $tmp_file_orig`;
   if ( my $trf = $args{trf} ) {
      `$trf $tmp_file_orig > $tmp_file`;
   }
   if ( my $post_pipe = $args{post_pipe} ) {
      `cat $tmp_file | $post_pipe > $tmp_file-2`;
       `mv $tmp_file-2 $tmp_file`;
   }
   if ( my $sed_args = $args{sed} ) {
      foreach my $sed_args ( @{$args{sed}} ) {
         `cat $tmp_file | sed $sed_args > $tmp_file-2`;
         `mv $tmp_file-2 $tmp_file`;
      }
   }
   if ( defined(my $sort_args = $args{sort}) ) {
      `cat $tmp_file | sort $sort_args > $tmp_file-2`;
      `mv $tmp_file-2 $tmp_file`;
   }

   my $res_file = $tmp_file;
   if ( $args{transform_result} ) {
      (undef, $res_file) = tempfile();
      output(
         sub { $args{transform_result}->($tmp_file) },
         file => $res_file,
      );
   }

   my $cmp_file = $expected_output;
   if ( $args{transform_sample} ) {
      (undef, $cmp_file) = tempfile();
      output(
         sub { $args{transform_sample}->($expected_output) },
         file => $cmp_file,
      );
   }

   # diff the outputs.
   $test_diff = `diff $res_file $cmp_file 2>&1`;
   my $retval = $?;

   # diff returns 0 if there were no differences,
   # so !0 = 1 = no diff in our testing parlance.
   $retval = $retval >> 8;

   if ( $retval ) {
      if ( $ENV{UPDATE_SAMPLES} || $args{update_sample} ) {
         `cat $tmp_file > $expected_output`;
         diag("Updated $expected_output");
      }
   }

   # Remove our tmp files.
   `rm -f $tmp_file $tmp_file_orig /tmp/pt-test-outfile-trf >/dev/null 2>&1`
      unless $ENV{KEEP_OUTPUT} || $args{keep_output};

   if ( $res_file ne $tmp_file ) {
      unlink $res_file if -f $res_file;
   }

   if ( $cmp_file ne $expected_output ) {
      unlink $cmp_file if -f $cmp_file;
   }

   return !$retval;
}

sub throws_ok {
   my ( $code, $pat, $msg ) = @_;
   eval { $code->(); };
   like ( $EVAL_ERROR, $pat, $msg );
}

# Remove /*percona-toolkit ...*/ trace comments from the given SQL statement(s).
# Traces are added in ChangeHandler::process_rows().
sub remove_traces {
   my ( $sql ) = @_;
   my $trace_pat = qr/ \/\*percona-toolkit .+?\*\//;
   if ( ref $sql && ref $sql eq 'ARRAY' ) {
      map { $_ =~ s/$trace_pat//gm } @$sql;
   }
   else {
      $sql =~ s/$trace_pat//gm;
   }
   return $sql;
}

sub test_bash_tool {
   my ( $tool ) = @_;
   die "I need a tool argument" unless $tool;
   my $outfile = "/tmp/$tool-test-results.txt";
   `rm -rf $outfile >/dev/null`;
   `$trunk/util/test-bash-tool $tool > $outfile`;
   print `cat $outfile`;
   return;
}

my %checksum_result_col = (
   ts        => 0,
   errors    => 1,
   diffs     => 2,
   rows      => 3,
   diff_rows => 4,
   chunks    => 5,
   skipped   => 6,
   time      => 7,
   table     => 7,
);
sub count_checksum_results {
   my ($output, $column, $table) = @_;

   my (@res) = map {
      my $line = $_;
      my (@cols) = $line =~ m/(\S+)/g;
      \@cols;
   }
   grep {
      my $line = $_;
      if ( !$table ) {
         $line;
      }
      else {
         $line =~ m/$table$/m ? $line : '';
      }
   }
   grep { m/^\d+\-\d+T\d\d:\d\d:\d\d\s+\d+/ } split /\n/, $output;
   my $colno = $checksum_result_col{lc $column};
   die "Invalid checksum result column: $column" unless defined $colno;
   my $total = 0;
   map { $total += $_->[$colno] } @res;
   return $total;
}

sub normalize_checksum_results {
   my ($output) = @_;
   my $tmp_file = "/tmp/test-checksum-results-output";
   open my $fh, ">", $tmp_file or die "Cannot open $tmp_file: $OS_ERROR";
   printf $fh $output;
   close $fh;
   my $normal_output = `cat $tmp_file | awk '/^[0-9 ]/ {print \$2 " " \$3 " " \$4 " " \$5 " " \$6 " " \$7 " " \$9} /^[A-Z]/ {print \$0}'`;
   if ( wantarray ) {
      my $original_output = `cat $tmp_file`;
      return $normal_output, $original_output;
   }
   `rm $tmp_file >/dev/null`;
   return $normal_output;
}

sub get_source_binlog_pos {
   my ($dbh) = @_;

   my $vp = VersionParser->new($dbh);
   my $source_name = 'source';
   if ( $vp->cmp('8.1') < 0 || $vp->flavor() =~ m/maria/i ) {
      $source_name = 'master';
   }

   my $sql = "SHOW ${source_status} STATUS";
   my $ms  = $dbh->selectrow_hashref($sql);
   return $ms->{position};
}

sub get_replica_pos_relative_to_source {
   my ($dbh) = @_;

   my $vp = VersionParser->new($dbh);
   my $source_name = 'source';
   my $replica_name = 'replica';
   if ( $vp->cmp('8.1') < 0 || $vp->flavor() =~ m/maria/i ) {
      $source_name = 'master';
      $replica_name = 'slave';
   }

   my $sql = "SHOW ${replica_name} STATUS";
   my $ss  = $dbh->selectrow_hashref($sql);
   return $ss->{"exec_${source_name}_log_pos"};
}

# Like output(), but forks a process to execute the coderef.
# This is because otherwise, errors thrown during cleanup
# would be skipped.
sub full_output {
   my ( $code, %args ) = @_;
   die "I need a code argument" unless $code;

   local (*STDOUT, *STDERR);
   require IO::File;

   my (undef, $file) = tempfile();
   open *STDOUT, '>', $file
         or die "Cannot open file $file: $OS_ERROR";
   *STDOUT->autoflush(1);

   my (undef, $file2) = tempfile();
   open *STDERR, '>', $file2
      or die "Cannot open file $file2: $OS_ERROR";
   *STDERR->autoflush(1);

   my $status;
   if (my $pid = fork) {
      if ( my $t = $args{wait_for} ) {
         # Wait for t seconds then kill the child.
         sleep $t;
         my $tries = 3;
         # Most tools require 2 interrupts to make them stop.
         while ( kill(0, $pid) && $tries-- ) {
            kill SIGTERM, $pid;
            sleep 0.10;
         }
         # Child didn't respond to SIGTERM?  Then kill -9 it.
         kill SIGKILL, $pid if kill(0, $pid);
         sleep 0.25;
      }
      waitpid($pid, 0);
      $status = $? >> 8;
   }
   else {
      exit $code->();
   }
   close $_ or die "Cannot close $_: $OS_ERROR" for qw(STDOUT STDERR);
   my $output = slurp_file($file) . slurp_file($file2);

   unlink $file;
   unlink $file2;

   return ($output, $status);
}

sub tables_used {
   my ($file) = @_;
   local $INPUT_RECORD_SEPARATOR = '';
   open my $fh, '<', $file or die "Cannot open $file: $OS_ERROR";
   my %tables;
   while ( defined(my $chunk = <$fh>) ) {
      map {
         my $db_tbl = $_;
         $db_tbl =~ s/^\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d\.\d+Z?//;  # strip leading timestamp (MySQL 5.7+)
         $db_tbl =~ s/^\s*`?//;  # strip leading space and `
         $db_tbl =~ s/\s*`?$//;  # strip trailing space and `
         $db_tbl =~ s/`\.`/./;   # strip inner `.`
         $tables{$db_tbl} = 1 if !($db_tbl =~ m/^\s*$/);
      }
      grep {
         m/(?:\w\.\w|`\.`)/  # only db.tbl, not just db
      }
      $chunk =~ m/(?:FROM|INTO|UPDATE)\s+(\S+)/gi;
   }
   return [ sort keys %tables ];
}

sub get_cmd_pid {
   my $cmd = shift;
   $cmd =~ s/\./\\./g;
   $cmd =~ s/-/\\-/g;
   my $output = `ps xww | grep -v grep | grep '$cmd'`;
   my @cmds = $output =~ m/\n/g;
   if ( @cmds > 1 ) {
      die "Found " . scalar @cmds . " commands matching '$cmd': @cmds";
   }
   my ($pid) = $output =~ m/^\s*(\d+)/;
   return wantarray ? ($pid, $output) : $pid;
}


sub can_load_data {
    my $output = `/tmp/12345/use -e "SELECT * FROM percona_test.load_data" 2>/dev/null`;
    return ($output || '') =~ /1/;
}

1;
}
# ###########################################################################
# End PerconaTest package
# ###########################################################################