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";
14 with 'Object::Remote::Role::Connector';
20 $kid = waitpid(-1, WNOHANG);
25 has module_sender => (is => 'lazy');
26 #if no child_stderr file handle is specified then stderr
27 #of the child will be connected to stderr of the parent
28 has stderr => ( is => 'rw', default => sub { \*STDERR } );
30 sub _build_module_sender {
32 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
34 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
37 has perl_command => (is => 'lazy');
39 #TODO convert nice value into optional feature enabled by
40 #setting value of attribute
41 #ulimit of ~500 megs of v-ram
42 #TODO only works with ssh with quotes but only works locally
44 #sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 80000; nice -n 15 perl -"' ] }
45 sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 200000; nice -n 15 perl -"' ] }
46 #sub _build_perl_command { [ 'perl', '-' ] }
48 around connect => sub {
49 my ($orig, $self) = (shift, shift);
50 my $f = $self->$start::start($orig => @_);
54 my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
55 $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
56 Object::Remote::Handle->new(
58 class => 'Object::Remote::ModuleLoader',
59 args => { module_sender => $self->module_sender }
61 require Object::Remote::Prompt;
62 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
68 sub final_perl_command { shift->perl_command }
72 my $given_stderr = $self->stderr;
75 Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
79 if (defined($given_stderr)) {
80 $foreign_stderr = gensym();
82 $foreign_stderr = ">&STDERR";
89 @{$self->final_perl_command},
90 ) or die "Failed to run perl at '$_[0]': $!";
92 if (defined($given_stderr)) {
93 log_warn { "using experimental cat for child stderr" };
95 #TODO refactor if this solves the problem
96 Object::Remote->current_loop
98 handle => $foreign_stderr,
99 on_read_ready => sub {
101 my $len = sysread($foreign_stderr, $buf, 32768);
102 if (!defined($len) or $len == 0) {
103 log_trace { "Got EOF or error on child stderr, removing from watcher" };
104 $self->stderr(undef);
105 Object::Remote->current_loop
107 handle => $foreign_stderr,
111 Dlog_trace { "got $len characters of stderr data for connection" };
112 print $given_stderr $buf or die "could not send stderr data: $!";
118 #TODO open2() dupes the child stderr into the calling
119 #process stderr which means if this process exits the
120 #child is still attached to the shell - using open3()
121 #and having the run loop manage the stderr means this
122 #won't happen BUT if the run loop just sends the remote
123 #stderr data to the local stderr the logs will interleave
124 #for sure - a simple test would be to use open3() and just
125 #close the remote stderr and see what happens - a longer
126 #term solution would be for Object::Remote to offer a feature
127 #where the user of a connection species a destination for output
128 #either a file name or their own file handle and the node output
131 # my $foreign_stdout,
133 # @{$self->final_perl_command},
134 # ) or die "Failed to run perl at '$_[0]': $!";
136 Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ];
137 return ($foreign_stdin, $foreign_stdout, $pid);
140 #TODO open2() forks off a child and I have not been able to locate
141 #a mechanism for reaping dead children so they don't become zombies
142 #CONFIRMED there is no reaping of children being done, find a safe
146 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
147 my $to_send = $self->fatnode_text;
148 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
149 Object::Remote->current_loop
151 handle => $foreign_stdin,
152 on_write_ready => sub {
153 my $len = syswrite($foreign_stdin, $to_send, 32768);
155 substr($to_send, 0, $len) = '';
157 # if the stdin went away, we'll never get Shere
158 # so it's not a big deal to simply give up on !defined
159 if (!defined($len) or 0 == length($to_send)) {
160 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
161 Object::Remote->current_loop
163 handle => $foreign_stdin,
167 log_trace { "Sent $len bytes of fatnode data to remote side" };
171 return ($foreign_stdin, $foreign_stdout, $pid);
176 require Object::Remote::FatNode;
178 $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
179 if $ENV{OBJECT_REMOTE_DEBUG};
181 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
182 $Object::Remote::FatNode::DATA = <<'ENDFAT';
184 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
187 eval $Object::Remote::FatNode::DATA;
190 $text .= "__END__\n";