1 package Object::Remote::Role::Connector::PerlInterpreter;
7 use Object::Remote::Logging qw( :log :dlog );
8 use Object::Remote::ModuleSender;
9 use Object::Remote::Handle;
10 use Object::Remote::Future;
11 use Scalar::Util qw(blessed weaken);
14 with 'Object::Remote::Role::Connector';
16 has module_sender => (is => 'lazy');
17 has ulimit => ( is => 'ro' );
18 has nice => ( is => 'ro' );
19 has watchdog_timeout => ( is => 'ro', required => 1, default => sub { undef } );
20 has perl_command => (is => 'lazy');
22 #if no child_stderr file handle is specified then stderr
23 #of the child will be connected to stderr of the parent
24 has stderr => ( is => 'rw', default => sub { undef } );
26 sub _build_module_sender {
28 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
30 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
33 sub _build_perl_command {
35 my $nice = $self->nice;
36 my $ulimit = $self->ulimit;
39 if (defined($ulimit)) {
40 $shell_code .= "ulimit -v $ulimit; ";
44 $shell_code .= "nice -n $nice ";
47 $shell_code .= 'perl -';
49 return [ 'sh', '-c', $shell_code ];
52 around connect => sub {
53 my ($orig, $self) = (shift, shift);
54 my $f = $self->$start::start($orig => @_);
58 $self->_setup_watchdog_reset($conn);
59 my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
60 $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
61 Object::Remote::Handle->new(
63 class => 'Object::Remote::ModuleLoader',
64 args => { module_sender => $self->module_sender }
66 require Object::Remote::Prompt;
67 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
73 sub final_perl_command { shift->perl_command }
77 my $given_stderr = $self->stderr;
80 Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
82 if (defined($given_stderr)) {
83 #if the stderr data goes to an existing file handle
84 #an anonymous file handle is required
85 #as the other half of a pipe style file handle pair
86 #so the file handles can go into the run loop
87 $foreign_stderr = gensym();
89 #if no file handle has been specified
90 #for the child's stderr then connect
91 #the child stderr to the parent stderr
92 $foreign_stderr = ">&STDERR";
99 @{$self->final_perl_command},
100 ) or die "Failed to run perl at '$_[0]': $!";
102 if (defined($given_stderr)) {
103 Dlog_debug { "Child process STDERR is being handled via run loop" };
105 Object::Remote->current_loop
107 handle => $foreign_stderr,
108 on_read_ready => sub {
110 my $len = sysread($foreign_stderr, $buf, 32768);
111 if (!defined($len) or $len == 0) {
112 log_trace { "Got EOF or error on child stderr, removing from watcher" };
113 $self->stderr(undef);
114 Object::Remote->current_loop
116 handle => $foreign_stderr,
120 Dlog_trace { "got $len characters of stderr data for connection" };
121 print $given_stderr $buf or die "could not send stderr data: $!";
127 return ($foreign_stdin, $foreign_stdout, $pid);
132 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
133 my $to_send = $self->fatnode_text;
134 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
135 Object::Remote->current_loop
137 handle => $foreign_stdin,
138 on_write_ready => sub {
139 my $len = syswrite($foreign_stdin, $to_send, 32768);
141 substr($to_send, 0, $len) = '';
143 # if the stdin went away, we'll never get Shere
144 # so it's not a big deal to simply give up on !defined
145 if (!defined($len) or 0 == length($to_send)) {
146 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
147 Object::Remote->current_loop
149 handle => $foreign_stdin,
153 log_trace { "Sent $len bytes of fatnode data to remote side" };
157 return ($foreign_stdin, $foreign_stdout, $pid);
160 sub _setup_watchdog_reset {
161 my ($self, $conn) = @_;
164 return unless $self->watchdog_timeout;
166 Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
170 $timer_id = Object::Remote->current_loop->watch_time(
171 every => $self->watchdog_timeout / 3,
173 unless(defined($conn)) {
174 log_trace { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
175 Object::Remote->current_loop->unwatch_time($timer_id);
179 Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
180 #we do not want to block in the run loop so send the
181 #update off and ignore any result, we don't need it
183 $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
192 require Object::Remote::FatNode;
194 if (defined($self->watchdog_timeout)) {
195 $text = "my \$WATCHDOG_TIMEOUT = '" . $self->watchdog_timeout . "';\n";
196 $text .= "alarm(\$WATCHDOG_TIMEOUT);\n";
198 $text = "my \$WATCHDOG_TIMEOUT = undef;\n";
201 $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
202 if $ENV{OBJECT_REMOTE_DEBUG};
204 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
205 $Object::Remote::FatNode::DATA = <<'ENDFAT';
207 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
210 eval $Object::Remote::FatNode::DATA;
214 $text .= "__END__\n";