1 package Object::Remote::Role::Connector::PerlInterpreter;
7 use Object::Remote::Logging qw(:log :dlog router);
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');
21 has pid => (is => 'rwp');
22 has connection_id => (is => 'rwp');
24 #if no child_stderr file handle is specified then stderr
25 #of the child will be connected to stderr of the parent
26 has stderr => ( is => 'rw', default => sub { undef } );
28 BEGIN { router()->exclude_forwarding; }
30 sub _build_module_sender {
32 grep {blessed($_) && $_->isa('Object::Remote::ModuleLoader::Hook') }
34 return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
37 sub _build_perl_command {
39 my $nice = $self->nice;
40 my $ulimit = $self->ulimit;
41 my $perl_path = 'perl';
44 if (defined($ulimit)) {
45 $shell_code .= "ulimit $ulimit || exit 1; ";
49 $shell_code .= "nice -n $nice ";
52 if (defined($ENV{OBJECT_REMOTE_PERL_BIN})) {
53 log_debug { "Using OBJECT_REMOTE_PERL_BIN environment variable as perl path" };
54 $perl_path = $ENV{OBJECT_REMOTE_PERL_BIN};
57 $shell_code .= $perl_path . ' -';
59 return [ 'bash', '-c', $shell_code ];
62 around connect => sub {
63 my ($orig, $self) = (shift, shift);
64 my $f = $self->$start::start($orig => @_);
68 $self->_setup_watchdog_reset($conn);
69 my $sub = $conn->remote_sub('Object::Remote::Logging::init_remote_logging');
70 $sub->('Object::Remote::Logging', router => router(), connection_id => $conn->_id);
71 Object::Remote::Handle->new(
73 class => 'Object::Remote::ModuleLoader',
74 args => { module_sender => $self->module_sender }
76 require Object::Remote::Prompt;
77 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
83 sub final_perl_command { shift->perl_command }
87 my $given_stderr = $self->stderr;
91 s/\n/ /g; "invoking connection to perl interpreter using command line: $_"
92 } @{$self->final_perl_command};
94 if (defined($given_stderr)) {
95 #if the stderr data goes to an existing file handle
96 #an anonymous file handle is required
97 #as the other half of a pipe style file handle pair
98 #so the file handles can go into the run loop
99 $foreign_stderr = gensym();
101 #if no file handle has been specified
102 #for the child's stderr then connect
103 #the child stderr to the parent stderr
104 $foreign_stderr = ">&STDERR";
111 @{$self->final_perl_command},
112 ) or die "Failed to run perl at '$_[0]': $!";
114 $self->_set_pid($pid);
116 if (defined($given_stderr)) {
117 Dlog_debug { "Child process STDERR is being handled via run loop" };
119 Object::Remote->current_loop
121 handle => $foreign_stderr,
122 on_read_ready => sub {
124 my $len = sysread($foreign_stderr, $buf, 32768);
125 if (!defined($len) or $len == 0) {
126 log_trace { "Got EOF or error on child stderr, removing from watcher" };
127 $self->stderr(undef);
128 Object::Remote->current_loop->unwatch_io(
129 handle => $foreign_stderr,
133 Dlog_trace { "got $len characters of stderr data for connection" };
134 print $given_stderr $buf or die "could not send stderr data: $!";
140 return ($foreign_stdin, $foreign_stdout, $pid);
145 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
146 my $to_send = $self->fatnode_text;
147 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
148 Object::Remote->current_loop
150 handle => $foreign_stdin,
151 on_write_ready => sub {
152 my $len = syswrite($foreign_stdin, $to_send, 32768);
154 substr($to_send, 0, $len) = '';
156 # if the stdin went away, we'll never get Shere
157 # so it's not a big deal to simply give up on !defined
158 if (!defined($len) or 0 == length($to_send)) {
159 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
160 Object::Remote->current_loop
162 handle => $foreign_stdin,
166 log_trace { "Sent $len bytes of fatnode data to remote side" };
170 return ($foreign_stdin, $foreign_stdout, $pid);
173 sub _setup_watchdog_reset {
174 my ($self, $conn) = @_;
177 return unless $self->watchdog_timeout;
179 Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
183 $timer_id = Object::Remote->current_loop->watch_time(
184 every => $self->watchdog_timeout / 3,
186 unless(defined($conn)) {
187 log_warn { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
188 Object::Remote->current_loop->unwatch_time($timer_id);
192 unless($conn->is_valid) {
193 log_warn { "Watchdog timer found an invalid connection, removing the timer" };
194 Object::Remote->current_loop->unwatch_time($timer_id);
198 Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
199 #we do not want to block in the run loop so send the
200 #update off and ignore any result, we don't need it
202 $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
206 $conn->on_close->on_ready(sub {
207 log_debug { "Removing watchdog for connection that is now closed" };
208 Object::Remote->current_loop->unwatch_time($timer_id);
214 my $connection_timeout = $self->timeout;
215 my $watchdog_timeout = $self->watchdog_timeout;
218 require Object::Remote::FatNode;
220 if (defined($connection_timeout)) {
221 $text .= "alarm($connection_timeout);\n";
224 if (defined($watchdog_timeout)) {
225 $text .= "my \$WATCHDOG_TIMEOUT = $watchdog_timeout;\n";
227 $text .= "my \$WATCHDOG_TIMEOUT = undef;\n";
230 $text .= '$Object::Remote::FatNode::REMOTE_NODE = "1";' . "\n";
233 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
234 $Object::Remote::FatNode::DATA = <<'ENDFAT';
236 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
239 eval $Object::Remote::FatNode::DATA;
243 $text .= "__END__\n";