1 package Object::Remote::Role::Connector::PerlInterpreter;
6 use Object::Remote::ModuleSender;
7 use Object::Remote::Handle;
8 use Object::Remote::Future;
9 use Object::Remote::Logging qw( :log :dlog );
10 use Scalar::Util qw(blessed);
11 use POSIX ":sys_wait_h";
15 with 'Object::Remote::Role::Connector';
17 #TODO ugh breaks some of the stuff in System::Introspector::Util by
18 #screwing with status value of child
23 $kid = waitpid(-1, WNOHANG);
28 has module_sender => (is => 'lazy');
29 #if no child_stderr file handle is specified then stderr
30 #of the child will be connected to stderr of the parent
31 has stderr => ( is => 'rw', default => sub { \*STDERR } );
32 #has stderr => ( is => 'rw' );
34 sub _build_module_sender {
36 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
38 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
41 has perl_command => (is => 'lazy');
43 #TODO convert nice value into optional feature enabled by
44 #setting value of attribute
45 #ulimit of ~500 megs of v-ram
46 #TODO only works with ssh with quotes but only works locally
48 sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 200000; nice -n 15 perl -"' ] }
49 #sub _build_perl_command { [ 'perl', '-' ] }
51 around connect => sub {
52 my ($orig, $self) = (shift, shift);
53 my $f = $self->$start::start($orig => @_);
57 my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
58 $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
59 Object::Remote::Handle->new(
61 class => 'Object::Remote::ModuleLoader',
62 args => { module_sender => $self->module_sender }
64 require Object::Remote::Prompt;
65 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
71 sub final_perl_command { shift->perl_command }
75 my $given_stderr = $self->stderr;
78 Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
80 if (defined($given_stderr)) {
81 $foreign_stderr = gensym();
83 $foreign_stderr = ">&STDERR";
90 @{$self->final_perl_command},
91 ) or die "Failed to run perl at '$_[0]': $!";
93 if (defined($given_stderr)) {
94 log_warn { "using experimental cat for child stderr" };
96 #TODO refactor if this solves the problem
97 Object::Remote->current_loop
99 handle => $foreign_stderr,
100 on_read_ready => sub {
102 my $len = sysread($foreign_stderr, $buf, 32768);
103 if (!defined($len) or $len == 0) {
104 log_trace { "Got EOF or error on child stderr, removing from watcher" };
105 $self->stderr(undef);
106 Object::Remote->current_loop
108 handle => $foreign_stderr,
112 Dlog_trace { "got $len characters of stderr data for connection" };
113 print $given_stderr $buf or die "could not send stderr data: $!";
119 #TODO open2() dupes the child stderr into the calling
120 #process stderr which means if this process exits the
121 #child is still attached to the shell - using open3()
122 #and having the run loop manage the stderr means this
123 #won't happen BUT if the run loop just sends the remote
124 #stderr data to the local stderr the logs will interleave
125 #for sure - a simple test would be to use open3() and just
126 #close the remote stderr and see what happens - a longer
127 #term solution would be for Object::Remote to offer a feature
128 #where the user of a connection species a destination for output
129 #either a file name or their own file handle and the node output
132 # my $foreign_stdout,
134 # @{$self->final_perl_command},
135 # ) or die "Failed to run perl at '$_[0]': $!";
137 # Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ];
140 return ($foreign_stdin, $foreign_stdout, $pid);
143 #TODO open2() forks off a child and I have not been able to locate
144 #a mechanism for reaping dead children so they don't become zombies
145 #CONFIRMED there is no reaping of children being done, find a safe
149 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
150 my $to_send = $self->fatnode_text;
151 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
152 Object::Remote->current_loop
154 handle => $foreign_stdin,
155 on_write_ready => sub {
156 my $len = syswrite($foreign_stdin, $to_send, 32768);
158 substr($to_send, 0, $len) = '';
160 # if the stdin went away, we'll never get Shere
161 # so it's not a big deal to simply give up on !defined
162 if (!defined($len) or 0 == length($to_send)) {
163 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
164 Object::Remote->current_loop
166 handle => $foreign_stdin,
170 log_trace { "Sent $len bytes of fatnode data to remote side" };
174 return ($foreign_stdin, $foreign_stdout, $pid);
179 require Object::Remote::FatNode;
181 $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
182 if $ENV{OBJECT_REMOTE_DEBUG};
184 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
185 $Object::Remote::FatNode::DATA = <<'ENDFAT';
187 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
190 eval $Object::Remote::FatNode::DATA;
193 $text .= "__END__\n";