experiment to test white listing Devel::GlobalDestruction and not shipping XS

[scpubgit/Object-Remote.git] / lib / Object / Remote / FatNode.pm

package Object::Remote::FatNode;

use strictures 1;
use Config;
use B qw(perlstring);

my @exclude_mods = qw(XSLoader.pm DynaLoader.pm);

#used by t/watchdog_fatnode
our $INHIBIT_RUN_NODE = 0;

sub stripspace {
  my ($text) = @_;
  $text =~ /^(\s+)/ && $text =~ s/^$1//mg;
  $text;
}

my %maybe_libs = map +($_ => 1), grep defined, (values %Config, '.');

my @extra_libs = grep not(ref($_) or $maybe_libs{$_}), @INC;

my $extra_libs = join '', map "  -I$_\n", @extra_libs;

my $command = qq(
  $^X
  $extra_libs
  -mObject::Remote
  -mObject::Remote::Connector::STDIO
  -mCPS::Future
  -mMRO::Compat
  -mClass::C3
  -mClass::C3::next
  -mAlgorithm::C3
  -mObject::Remote::ModuleLoader
  -mObject::Remote::Node
  -mMethod::Generate::BuildAll
  -mMethod::Generate::DemolishAll
  -mJSON::PP
  -e 'print join "\\n", \%INC'
);

$command =~ s/\n/ /g;

#warn $command;
chomp(my @inc = qx($command));

my %exclude = map { $_ => 1 } @exclude_mods;
my %mod_files = @inc;
my %mods = reverse @inc;

foreach(keys(%mods)) {
  if ($exclude{ $mods{$_} }) {
    delete($mods{$_});    
  }
}

#TODO quick and dirty mod for testing - vendorarchexp from a perlbrew build
#was set to '' which evaluates as a true regex

#use Data::Dumper;
#print STDERR Dumper([keys %mod_files]);
#print STDERR Dumper([keys %mods]);

my @non_core_non_arch = ( $mod_files{'Devel/GlobalDestruction.pm'} );
push @non_core_non_arch, grep +(
  not (
    $Config{privlibexp} ne '' && /^\Q$Config{privlibexp}/ 
      or $Config{archlibexp} ne '' && /^\Q$Config{archlibexp}/
      or $Config{vendorarchexp} ne '' && /^\Q$Config{vendorarchexp}/
      or $Config{sitearchexp} ne '' && /^\Q$Config{sitearchexp}/
  )
), grep !/\Q$Config{archname}/, grep !/\Q$Config{myarchname}/, keys %mods;

my @core_non_arch = grep +(
  $Config{privlibexp} ne '' && /^\Q$Config{privlibexp}/
  and not($Config{archlibexp} ne '' && /^\Q$Config{archlibexp}/
    or /\Q$Config{archname}/ or /\Q$Config{myarchname}/)
), keys %mods;

#print STDERR "non-core non-arch ", Dumper(\@non_core_non_arch);
#print STDERR "core non-arch ", Dumper(\@core_non_arch);

#TODO this is the wrong path to go down - fork() will bring
#the env vars with it and the ssh connector can handle
#forwarding the env vars
my $env_pass = '';
if (defined($ENV{OBJECT_REMOTE_LOG_LEVEL})) {
  my $level = $ENV{OBJECT_REMOTE_LOG_LEVEL};
  $env_pass .= '$ENV{OBJECT_REMOTE_LOG_LEVEL} = "' . $level . "\";\n";
}
if (defined($ENV{OBJECT_REMOTE_LOG_FORMAT})) {
  my $format = $ENV{OBJECT_REMOTE_LOG_FORMAT};
  $env_pass .= '$ENV{OBJECT_REMOTE_LOG_FORMAT} = "' . $format . "\";\n";
}
if (defined($ENV{OBJECT_REMOTE_LOG_SELECTIONS})) {
  my $selections = $ENV{OBJECT_REMOTE_LOG_SELECTIONS};
  $env_pass .= '$ENV{OBJECT_REMOTE_LOG_SELECTIONS} = "' . $selections . "\";\n";
}
if (defined($ENV{OBJECT_REMOTE_LOG_FORWARDING})) {
  my $forwarding = $ENV{OBJECT_REMOTE_LOG_FORWARDING};
  $env_pass .= '$ENV{OBJECT_REMOTE_LOG_FORWARDING} = "' . $forwarding . "\";\n";
}

my $start = stripspace <<'END_START';
  # This chunk of stuff was generated by Object::Remote::FatNode. To find
  # the original file's code, look for the end of this BEGIN block or the
  # string 'FATPACK'
  BEGIN {
  my (%fatpacked,%fatpacked_extra);
END_START

$start .= 'my %exclude = map { $_ => 1 } qw(' . join(' ', @exclude_mods) . ");\n";

my $end = stripspace <<'END_END';
  s/^  //mg for values %fatpacked, values %fatpacked_extra;

sub load_from_hash {
    if (my $fat = $_[0]->{$_[1]}) {
      if ($exclude{$_[1]}) {
        warn "Will not pre-load '$_[1]'";
        return undef; 
      }
 
      #warn "handling $_[1]";
      open my $fh, '<', \$fat;
      return $fh;
    }
    
    #Uncomment this to find brokenness
    #warn "Missing $_[1]";
    return;
  }

  unshift @INC, sub { load_from_hash(\%fatpacked, $_[1]) };
  push @INC, sub { load_from_hash(\%fatpacked_extra, $_[1]) };

  } # END OF FATPACK CODE

  use strictures 1;
  use Object::Remote::Node;
  
  unless ($Object::Remote::FatNode::INHIBIT_RUN_NODE) {
    Object::Remote::Node->run(watchdog_timeout => $WATCHDOG_TIMEOUT);    
  }
  
END_END

my %files = map +($mods{$_} => scalar do { local (@ARGV, $/) = ($_); <> }),
              @non_core_non_arch, @core_non_arch;

my %did_pack;
sub generate_fatpack_hash {
  my ($hash_name, $orig) = @_;
  (my $stub = $orig) =~ s/\.pm$//;
  my $name = uc join '_', split '/', $stub;
  my $data = $files{$orig} or die $orig; $data =~ s/^/  /mg;
  return () if $did_pack{$hash_name}{$orig};
  $did_pack{$hash_name}{$orig} = 1;
  return '$'.$hash_name.'{'.perlstring($orig).qq!} = <<'${name}';\n!
  .qq!${data}${name}\n!;
}

my @segments = (
    map(generate_fatpack_hash('fatpacked', $_), sort map $mods{$_}, @non_core_non_arch),
    map(generate_fatpack_hash('fatpacked_extra', $_), sort map $mods{$_}, @core_non_arch),
);

#print STDERR Dumper(\@segments);
our $DATA = join "\n", $start, $env_pass, @segments, $end;

1;