package Object::Remote::Role::Connector::PerlInterpreter;
use IPC::Open2;
+use IPC::Open3;
+use IO::Handle;
use Object::Remote::ModuleSender;
use Object::Remote::Handle;
+use Object::Remote::Future;
+use Object::Remote::Logging qw( :log :dlog );
use Scalar::Util qw(blessed);
use Moo::Role;
with 'Object::Remote::Role::Connector';
has module_sender => (is => 'lazy');
+#if no child_stderr file handle is specified then stderr
+#of the child will be connected to stderr of the parent
+has stderr => ( is => 'rw', default => sub { \*STDERR } );
sub _build_module_sender {
my ($hook) =
return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
}
+has perl_command => (is => 'lazy');
+
+#TODO convert nice value into optional feature enabled by
+#setting value of attribute
+#ulimit of ~500 megs of v-ram
+#TODO only works with ssh with quotes but only works locally
+#with out quotes
+#sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 80000; nice -n 15 perl -"' ] }
+sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 500000; nice -n 15 perl -"' ] }
+#sub _build_perl_command { [ 'perl', '-' ] }
+
around connect => sub {
my ($orig, $self) = (shift, shift);
- my $conn = $self->$orig(@_);
- Object::Remote::Handle->new(
- connection => $conn,
- class => 'Object::Remote::ModuleLoader',
- args => { module_sender => $self->module_sender }
- )->disarm_free;
- return $conn;
+ my $f = $self->$start::start($orig => @_);
+ return future {
+ $f->on_done(sub {
+ my ($conn) = $f->get;
+ my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
+ $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
+ Object::Remote::Handle->new(
+ connection => $conn,
+ class => 'Object::Remote::ModuleLoader',
+ args => { module_sender => $self->module_sender }
+ )->disarm_free;
+ require Object::Remote::Prompt;
+ Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
+ });
+ $f;
+ } 2;
};
-sub _perl_command { 'perl', '-' }
+sub final_perl_command { shift->perl_command }
-sub _open2_for {
+sub _start_perl {
my $self = shift;
- my $pid = open2(
- my $foreign_stdout,
+ my $given_stderr = $self->stderr;
+ my $foreign_stderr;
+
+ Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
+
+ use Symbol;
+
+ if (defined($given_stderr)) {
+ $foreign_stderr = gensym();
+ } else {
+ $foreign_stderr = ">&STDERR";
+ }
+
+ my $pid = open3(
my $foreign_stdin,
- $self->_perl_command(@_),
+ my $foreign_stdout,
+ $foreign_stderr,
+ @{$self->final_perl_command},
) or die "Failed to run perl at '$_[0]': $!";
- require Object::Remote::FatNode;
- print $foreign_stdin $Object::Remote::FatNode::DATA, "__END__\n"
- or die "Failed to send fatpacked data to new node on '$_[0]': $!";
+
+ if (defined($given_stderr)) {
+ log_warn { "using experimental cat for child stderr" };
+
+ #TODO refactor if this solves the problem
+ Object::Remote->current_loop
+ ->watch_io(
+ handle => $foreign_stderr,
+ on_read_ready => sub {
+ my $buf = '';
+ my $len = sysread($foreign_stderr, $buf, 32768);
+ if (!defined($len) or $len == 0) {
+ log_trace { "Got EOF or error on child stderr, removing from watcher" };
+ $self->stderr(undef);
+ Object::Remote->current_loop
+ ->unwatch_io(
+ handle => $foreign_stderr,
+ on_read_ready => 1
+ );
+ } else {
+ Dlog_trace { "got $len characters of stderr data for connection" };
+ print $given_stderr $buf or die "could not send stderr data: $!";
+ }
+ }
+ );
+ }
+
+ #TODO open2() dupes the child stderr into the calling
+ #process stderr which means if this process exits the
+ #child is still attached to the shell - using open3()
+ #and having the run loop manage the stderr means this
+ #won't happen BUT if the run loop just sends the remote
+ #stderr data to the local stderr the logs will interleave
+ #for sure - a simple test would be to use open3() and just
+ #close the remote stderr and see what happens - a longer
+ #term solution would be for Object::Remote to offer a feature
+ #where the user of a connection species a destination for output
+ #either a file name or their own file handle and the node output
+ #is dumped to it
+# my $pid = open2(
+# my $foreign_stdout,
+# my $foreign_stdin,
+# @{$self->final_perl_command},
+# ) or die "Failed to run perl at '$_[0]': $!";
+
+ Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ];
return ($foreign_stdin, $foreign_stdout, $pid);
}
+#TODO open2() forks off a child and I have not been able to locate
+#a mechanism for reaping dead children so they don't become zombies
+#CONFIRMED there is no reaping of children being done, find a safe
+#way to do it
+sub _open2_for {
+ my $self = shift;
+ my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
+ my $to_send = $self->fatnode_text;
+ log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
+ Object::Remote->current_loop
+ ->watch_io(
+ handle => $foreign_stdin,
+ on_write_ready => sub {
+ my $len = syswrite($foreign_stdin, $to_send, 32768);
+ if (defined $len) {
+ substr($to_send, 0, $len) = '';
+ }
+ # if the stdin went away, we'll never get Shere
+ # so it's not a big deal to simply give up on !defined
+ if (!defined($len) or 0 == length($to_send)) {
+ log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
+ Object::Remote->current_loop
+ ->unwatch_io(
+ handle => $foreign_stdin,
+ on_write_ready => 1
+ );
+ } else {
+ log_trace { "Sent $len bytes of fatnode data to remote side" };
+ }
+ }
+ );
+ return ($foreign_stdin, $foreign_stdout, $pid);
+}
+
+sub fatnode_text {
+ my ($self) = @_;
+ require Object::Remote::FatNode;
+ my $text = '';
+ $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
+ if $ENV{OBJECT_REMOTE_DEBUG};
+ $text .= <<'END';
+$INC{'Object/Remote/FatNode.pm'} = __FILE__;
+$Object::Remote::FatNode::DATA = <<'ENDFAT';
+END
+ $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
+ $text .= "ENDFAT\n";
+ $text .= <<'END';
+eval $Object::Remote::FatNode::DATA;
+die $@ if $@;
+END
+ $text .= "__END__\n";
+ return $text;
+}
+
1;
projects / scpubgit/Object-Remote.git / blobdiff