1 package Object::Remote::Role::Connector::PerlInterpreter;
6 use Object::Remote::Logging qw(:log :dlog router);
7 use Object::Remote::ModuleSender;
8 use Object::Remote::Handle;
9 use Object::Remote::Future;
10 use Scalar::Util qw(blessed weaken);
13 with 'Object::Remote::Role::Connector';
15 has module_sender => (is => 'lazy');
16 has ulimit => ( is => 'ro');
17 has nice => ( is => 'ro');
18 has watchdog_timeout => ( is => 'ro', required => 1, default => sub { undef });
19 has perl_command => (is => 'lazy');
20 has pid => (is => 'rwp');
21 has connection_id => (is => 'rwp');
23 #if no child_stderr file handle is specified then stderr
24 #of the child will be connected to stderr of the parent
25 has stderr => ( is => 'rw', default => sub { undef } );
27 BEGIN { router()->exclude_forwarding; }
29 sub _build_module_sender {
31 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
33 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
36 sub _build_perl_command {
38 my $nice = $self->nice;
39 my $ulimit = $self->ulimit;
40 my $perl_path = 'perl';
43 if (defined($ulimit)) {
44 $shell_code .= "ulimit $ulimit || exit 1; ";
48 $shell_code .= "nice -n $nice ";
51 if (defined($ENV{OBJECT_REMOTE_PERL_BIN})) {
52 log_debug { "Using OBJECT_REMOTE_PERL_BIN environment variable as perl path" };
53 $perl_path = $ENV{OBJECT_REMOTE_PERL_BIN};
56 $shell_code .= $perl_path . ' -';
58 return [ 'bash', '-c', $shell_code ];
61 around connect => sub {
62 my ($orig, $self) = (shift, shift);
63 my $f = $self->$start::start($orig => @_);
67 $self->_setup_watchdog_reset($conn);
68 my $sub = $conn->remote_sub('Object::Remote::Logging::init_remote_logging');
69 $sub->('Object::Remote::Logging', router => router(), connection_id => $conn->_id);
70 Object::Remote::Handle->new(
72 class => 'Object::Remote::ModuleLoader',
73 args => { module_sender => $self->module_sender }
75 require Object::Remote::Prompt;
76 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
82 sub final_perl_command { shift->perl_command }
86 my $given_stderr = $self->stderr;
90 s/\n/ /g; "invoking connection to perl interpreter using command line: $_"
91 } @{$self->final_perl_command};
93 if (defined($given_stderr)) {
94 #if the stderr data goes to an existing file handle
95 #an anonymous file handle is required
96 #as the other half of a pipe style file handle pair
97 #so the file handles can go into the run loop
98 $foreign_stderr = gensym();
100 #if no file handle has been specified
101 #for the child's stderr then connect
102 #the child stderr to the parent stderr
103 $foreign_stderr = ">&STDERR";
110 @{$self->final_perl_command},
111 ) or die "Failed to run perl at '$_[0]': $!";
113 $self->_set_pid($pid);
115 if (defined($given_stderr)) {
116 Dlog_debug { "Child process STDERR is being handled via run loop" };
118 Object::Remote->current_loop
120 handle => $foreign_stderr,
121 on_read_ready => sub {
123 my $len = sysread($foreign_stderr, $buf, 32768);
124 if (!defined($len) or $len == 0) {
125 log_trace { "Got EOF or error on child stderr, removing from watcher" };
126 $self->stderr(undef);
127 Object::Remote->current_loop->unwatch_io(
128 handle => $foreign_stderr,
132 Dlog_trace { "got $len characters of stderr data for connection" };
133 print $given_stderr $buf or die "could not send stderr data: $!";
139 return ($foreign_stdin, $foreign_stdout, $pid);
144 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
145 my $to_send = $self->fatnode_text;
146 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
147 Object::Remote->current_loop
149 handle => $foreign_stdin,
150 on_write_ready => sub {
151 my $len = syswrite($foreign_stdin, $to_send, 32768);
153 substr($to_send, 0, $len) = '';
155 # if the stdin went away, we'll never get Shere
156 # so it's not a big deal to simply give up on !defined
157 if (!defined($len) or 0 == length($to_send)) {
158 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
159 Object::Remote->current_loop
161 handle => $foreign_stdin,
165 log_trace { "Sent $len bytes of fatnode data to remote side" };
169 return ($foreign_stdin, $foreign_stdout, $pid);
172 sub _setup_watchdog_reset {
173 my ($self, $conn) = @_;
176 return unless $self->watchdog_timeout;
178 Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
182 $timer_id = Object::Remote->current_loop->watch_time(
183 every => $self->watchdog_timeout / 3,
185 unless(defined($conn)) {
186 log_warn { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
187 Object::Remote->current_loop->unwatch_time($timer_id);
191 unless($conn->is_valid) {
192 log_warn { "Watchdog timer found an invalid connection, removing the timer" };
193 Object::Remote->current_loop->unwatch_time($timer_id);
197 Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
198 #we do not want to block in the run loop so send the
199 #update off and ignore any result, we don't need it
201 $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
205 $conn->on_close->on_ready(sub {
206 log_debug { "Removing watchdog for connection that is now closed" };
207 Object::Remote->current_loop->unwatch_time($timer_id);
213 my $connection_timeout = $self->timeout;
214 my $watchdog_timeout = $self->watchdog_timeout;
217 require Object::Remote::FatNode;
219 if (defined($connection_timeout)) {
220 $text .= "alarm($connection_timeout);\n";
223 if (defined($watchdog_timeout)) {
224 $text .= "my \$WATCHDOG_TIMEOUT = $watchdog_timeout;\n";
226 $text .= "my \$WATCHDOG_TIMEOUT = undef;\n";
229 $text .= '$Object::Remote::FatNode::REMOTE_NODE = "1";' . "\n";
232 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
233 $Object::Remote::FatNode::DATA = <<'ENDFAT';
235 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
238 eval $Object::Remote::FatNode::DATA;
242 $text .= "__END__\n";