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);
13 with 'Object::Remote::Role::Connector';
15 has module_sender => (is => 'lazy');
16 #if no child_stderr file handle is specified then stderr
17 #of the child will be connected to stderr of the parent
18 has stderr => ( is => 'rw', default => sub { \*STDERR } );
20 sub _build_module_sender {
22 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
24 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
27 has perl_command => (is => 'lazy');
29 #TODO convert nice value into optional feature enabled by
30 #setting value of attribute
31 #ulimit of ~500 megs of v-ram
32 #TODO only works with ssh with quotes but only works locally
34 #sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 80000; nice -n 15 perl -"' ] }
35 sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 500000; nice -n 15 perl -"' ] }
36 #sub _build_perl_command { [ 'perl', '-' ] }
38 around connect => sub {
39 my ($orig, $self) = (shift, shift);
40 my $f = $self->$start::start($orig => @_);
44 my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
45 $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
46 Object::Remote::Handle->new(
48 class => 'Object::Remote::ModuleLoader',
49 args => { module_sender => $self->module_sender }
51 require Object::Remote::Prompt;
52 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
58 sub final_perl_command { shift->perl_command }
62 my $given_stderr = $self->stderr;
65 Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
69 if (defined($given_stderr)) {
70 $foreign_stderr = gensym();
72 $foreign_stderr = ">&STDERR";
79 @{$self->final_perl_command},
80 ) or die "Failed to run perl at '$_[0]': $!";
82 if (defined($given_stderr)) {
83 log_warn { "using experimental cat for child stderr" };
85 #TODO refactor if this solves the problem
86 Object::Remote->current_loop
88 handle => $foreign_stderr,
89 on_read_ready => sub {
91 my $len = sysread($foreign_stderr, $buf, 32768);
92 if (!defined($len) or $len == 0) {
93 log_trace { "Got EOF or error on child stderr, removing from watcher" };
95 Object::Remote->current_loop
97 handle => $foreign_stderr,
101 Dlog_trace { "got $len characters of stderr data for connection" };
102 print $given_stderr $buf or die "could not send stderr data: $!";
108 #TODO open2() dupes the child stderr into the calling
109 #process stderr which means if this process exits the
110 #child is still attached to the shell - using open3()
111 #and having the run loop manage the stderr means this
112 #won't happen BUT if the run loop just sends the remote
113 #stderr data to the local stderr the logs will interleave
114 #for sure - a simple test would be to use open3() and just
115 #close the remote stderr and see what happens - a longer
116 #term solution would be for Object::Remote to offer a feature
117 #where the user of a connection species a destination for output
118 #either a file name or their own file handle and the node output
121 # my $foreign_stdout,
123 # @{$self->final_perl_command},
124 # ) or die "Failed to run perl at '$_[0]': $!";
126 Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ];
127 return ($foreign_stdin, $foreign_stdout, $pid);
130 #TODO open2() forks off a child and I have not been able to locate
131 #a mechanism for reaping dead children so they don't become zombies
132 #CONFIRMED there is no reaping of children being done, find a safe
136 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
137 my $to_send = $self->fatnode_text;
138 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
139 Object::Remote->current_loop
141 handle => $foreign_stdin,
142 on_write_ready => sub {
143 my $len = syswrite($foreign_stdin, $to_send, 32768);
145 substr($to_send, 0, $len) = '';
147 # if the stdin went away, we'll never get Shere
148 # so it's not a big deal to simply give up on !defined
149 if (!defined($len) or 0 == length($to_send)) {
150 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
151 Object::Remote->current_loop
153 handle => $foreign_stdin,
157 log_trace { "Sent $len bytes of fatnode data to remote side" };
161 return ($foreign_stdin, $foreign_stdout, $pid);
166 require Object::Remote::FatNode;
168 $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
169 if $ENV{OBJECT_REMOTE_DEBUG};
171 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
172 $Object::Remote::FatNode::DATA = <<'ENDFAT';
174 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
177 eval $Object::Remote::FatNode::DATA;
180 $text .= "__END__\n";