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package Gruntmaster::Daemon::Format;
use 5.014000;
use strict;
use warnings;
use parent qw/Exporter/;
no if $] > 5.017011, warnings => 'experimental::smartmatch';
use Digest::SHA qw/sha256_hex/;
use Expect;
use File::Basename qw/fileparse/;
use File::Copy qw/cp/;
use File::Slurp qw/read_file write_file/;
use List::MoreUtils qw/natatime/;
use Log::Log4perl qw/get_logger/;
use String::ShellQuote qw/shell_quote/;
use Try::Tiny;
our $VERSION = '5999.000_005';
our @EXPORT_OK = qw/prepare_files stopvms/;
##################################################
our (%vm, %pid);
sub runvm {
        my ($name, $arg) = @_;
        return unless $ENV{GRUNTMASTER_VM};
        my $cmd = $ENV{GRUNTMASTER_VM};
        $cmd .= ' ' . $arg if $arg;
        get_logger->trace("Starting VM $name ($cmd)");
        $vm{$name} = Expect->new;
        $vm{$name}->raw_pty(1);
        $vm{$name}->log_stdout(0);
        $vm{$name}->spawn($cmd);
        $vm{$name}->expect(5, '# ') or get_logger->logdie("Error while starting VM $name: ". $vm{$name}->error);
}
sub stopvms {
        kill KILL => $_->pid for values %vm;
        %vm = %pid = ();
}
sub execlist_finish {
        my ($vm, $kill) = @_;
        if ($vm{$vm}) {
                warn "Cannot kill VM\n" if $kill;
                $vm{$vm}->expect(5, '# ');
        } else {
                kill KILL => $pid{$vm} if $kill;
                waitpid $pid{$vm}, 0;
        }
        return if $kill;
        my $er = "exec-result-$vm";
        die "gruntmaster-exec died\n" if -z $er;
        my ($excode, $exmsg) = read_file $er;
        unlink $er;
        chomp ($excode, $exmsg); ## no critic (ProhibitParensWithBuiltins)
        get_logger->trace("Exec result from $vm: $excode $exmsg");
        die [$excode, $exmsg] if $excode; ## no critic (RequireCarping)
}
sub execlist {
        my ($vm, @args) = @_;
        my $er = "exec-result-$vm";
        if ($vm{$vm}) {
                my $cmd = ">$er " . shell_quote 'gruntmaster-exec', @args;
                get_logger->trace("Running in VM $vm: $cmd");
                $vm{$vm}->send($cmd, "\n");
        } else {
                $pid{$vm} = fork // die "Cannot fork\n";
                unless ($pid{$vm}) {
                        open STDOUT, '>', $er or die "Cannot open $er\n";
                        get_logger->trace("Running: gruntmaster-exec @args");
                        exec 'gruntmaster-exec', @args;
                }
        }
}
sub mkrun{
        my $format = shift;
        sub{
                local *__ANON__ = 'mkrun_runner';
                my ($name, %args) = @_;
                get_logger->trace("Running $name...");
                my $basename = fileparse $name, qr/[.][^.]*/s;
                my @args = ('--sudo');
                push @args, '--keep-stderr' if $ENV{TEST_VERBOSE};
                push @args, '--timeout', $args{timeout} if $args{timeout};
                push @args, '--mlimit',  $args{mlimit}  if $args{mlimit};
                push @args, '--olimit',  $args{olimit}  if $args{olimit};
                my @fds = exists $args{fds} ? @{$args{fds}} : ();
                my $it = natatime 2, @fds;
                while (my ($fd, $file) = $it->()) {
                        push @args, "--fd=$fd $file";
                }
                execlist $basename, @args, '--', "./$basename", @{$args{args}};
                execlist_finish $basename unless $args{nonblocking}
        }
}
sub prepare{
        my ($name, $format) = @_;
        get_logger->trace("Preparing file $name...");
        try {
                execlist prog => '--fd=1 >>errors', '--fd=2 >>errors', 'gruntmaster-compile', $format, $name;
                execlist_finish 'prog';
        } catch {
                my $exmsg = $_->[1];
                die "Compile error ($exmsg)\n"
        } finally {
                $Gruntmaster::Daemon::errors .= read_file 'errors';
                $Gruntmaster::Daemon::errors .= "\n" if -s 'errors';
                unlink 'errors';
        };
}
sub prepare_files{
        my $meta = shift;
        if ($meta->{runner} eq 'Interactive') {
                runvm ver => '-serial unix:vm.sock,nowait,server';
                runvm prog => '-serial unix:vm.sock,nowait';
        } else {
                runvm $_ for keys %{$meta->{files}};
        }
        for my $file (values %{$meta->{files}}) {
                my ($format, $name, $content) = @{$file}{qw/format name content/};
                $file->{run} = mkrun($format);
                write_file $name, $content;
                if ($ENV{GRUNTMASTER_CCACHE}) {
                        my $key = lc sha256_hex($content) . '-' . $format;
                        my $cachefn = "$ENV{GRUNTMASTER_CCACHE}/$key";
                        my $exefn = fileparse $name, qr/[.][^.]*/s;
                        if (cp $cachefn, $exefn) {
                                get_logger->trace("File $name found in compilation cache")
                        } else {
                                prepare $name, $format;
                                cp $exefn, $cachefn
                        }
                } else {
                        prepare $name, $format
                }
        }
}
1;
__END__
HideShow 50 lines of Pod
=encoding utf-8
=head1 NAME
Gruntmaster::Daemon::Format - Utility functions for handling source files
=head1 SYNOPSIS
  use Gruntmaster::Daemon::Format qw/prepare_files/;
  prepare_files { files => {
    prog => {
      name => 'prog.pl',
      format => 'PERL',
      content => 'print "Hello, world!"'
    },
    ver => {
      name => 'ver.cpp',
      format => 'CPP',
      content => ...
    },
  }};
=head1 DESCRIPTION
Gruntmaster::Daemon::Format exports utility functions for handling source files.
=over
=item B<prepare_files> I<$meta>
Compiles all the source files in C<< $meta->{files} >>.
=back
=head1 AUTHOR
Marius Gavrilescu E<lt>marius@ieval.roE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2014 by Marius Gavrilescu
This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
=cut