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package Sidecar;
# vim: ts=2 sw=2 noexpandtab
# "Sidecar" is what I call a subprocess that handles a particular
# object. The analogy is to motorcycle sidecars.
use warnings;
use strict;
use Storable qw(nfreeze thaw);
sub BUILD {
use IPC::Run qw(start);
use Symbol qw(gensym);
my ($fh_in, $fh_out, $fh_err) = (gensym(), gensym(), gensym());
my $ipc_run = start(
$cmd,
'<pipe', $fh_in,
'>pipe', $fh_out,
'2>pipe', $fh_err,
) or die "IPC::Run start() failed: $? ($!)";
return($ipc_run, $fh_in, $fh_out, $fh_err);
}
sub _sidecar_drive {
my $self = shift;
my $buffer = "";
my $read_length;
binmode(STDIN);
binmode(STDOUT);
select STDOUT; $| = 1;
use bytes;
while (1) {
if (defined $read_length) {
if (length($buffer) >= $read_length) {
my $request = thaw(substr($buffer, 0, $read_length, ""));
$read_length = undef;
my ($request_id, $context, $method, @args) = @$request;
my $streamable;
if ($context eq "array") {
my (@return) = eval { $self->$method(@args); };
$streamable = nfreeze( [ $request_id, $context, $@, @return ] );
}
elsif ($context eq "scalar") {
my $return = eval { $self->$method(@args); };
$streamable = nfreeze( [ $request_id, $context, $@, $return ] );
}
else {
eval { $self->$method(@args); undef; };
$streamable = nfreeze( [ $request_id, $context, $@ ] );
}
my $stream = length($streamable) . chr(0) . $streamable;
my $octets_wrote = syswrite(STDOUT, $stream);
die $! unless $octets_wrote == length($stream);
next;
}
}
elsif ($buffer =~ s/^(\d+)\0//) {
$read_length = $1;
next;
}
my $octets_read = sysread(STDIN, $buffer, 4096, length($buffer));
last unless $octets_read;
}
exit 0;
}
1;
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