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');
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;
37 my $perl_path = 'perl';
40 if (defined($ulimit)) {
41 $shell_code .= "ulimit $ulimit || exit 1; ";
45 $shell_code .= "nice -n $nice ";
48 if (defined($ENV{OBJECT_REMOTE_PERL_BIN})) {
49 log_debug { "Using OBJECT_REMOTE_PERL_BIN environment variable as perl path" };
50 $perl_path = $ENV{OBJECT_REMOTE_PERL_BIN};
53 $shell_code .= $perl_path . ' -';
55 return [ 'bash', '-c', $shell_code ];
59 around connect => sub {
60 my ($orig, $self) = (shift, shift);
61 my $f = $self->$start::start($orig => @_);
65 $self->_setup_watchdog_reset($conn);
66 my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
67 $sub->('Object::Remote::Logging', router => router(), connection_id => $conn->_id);
68 Object::Remote::Handle->new(
70 class => 'Object::Remote::ModuleLoader',
71 args => { module_sender => $self->module_sender }
73 require Object::Remote::Prompt;
74 Object::Remote::Prompt::maybe_set_prompt_command_on($conn);
80 sub final_perl_command { shift->perl_command }
84 my $given_stderr = $self->stderr;
87 Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
89 if (defined($given_stderr)) {
90 #if the stderr data goes to an existing file handle
91 #an anonymous file handle is required
92 #as the other half of a pipe style file handle pair
93 #so the file handles can go into the run loop
94 $foreign_stderr = gensym();
96 #if no file handle has been specified
97 #for the child's stderr then connect
98 #the child stderr to the parent stderr
99 $foreign_stderr = ">&STDERR";
106 @{$self->final_perl_command},
107 ) or die "Failed to run perl at '$_[0]': $!";
109 if (defined($given_stderr)) {
110 Dlog_debug { "Child process STDERR is being handled via run loop" };
112 Object::Remote->current_loop
114 handle => $foreign_stderr,
115 on_read_ready => sub {
117 my $len = sysread($foreign_stderr, $buf, 32768);
118 if (!defined($len) or $len == 0) {
119 log_trace { "Got EOF or error on child stderr, removing from watcher" };
120 $self->stderr(undef);
121 Object::Remote->current_loop->unwatch_io(
122 handle => $foreign_stderr,
126 Dlog_trace { "got $len characters of stderr data for connection" };
127 print $given_stderr $buf or die "could not send stderr data: $!";
133 return ($foreign_stdin, $foreign_stdout, $pid);
138 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
139 my $to_send = $self->fatnode_text;
140 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
141 Object::Remote->current_loop
143 handle => $foreign_stdin,
144 on_write_ready => sub {
145 my $len = syswrite($foreign_stdin, $to_send, 32768);
147 substr($to_send, 0, $len) = '';
149 # if the stdin went away, we'll never get Shere
150 # so it's not a big deal to simply give up on !defined
151 if (!defined($len) or 0 == length($to_send)) {
152 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
153 Object::Remote->current_loop
155 handle => $foreign_stdin,
159 log_trace { "Sent $len bytes of fatnode data to remote side" };
163 return ($foreign_stdin, $foreign_stdout, $pid);
166 sub _setup_watchdog_reset {
167 my ($self, $conn) = @_;
170 return unless $self->watchdog_timeout;
172 Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
176 $timer_id = Object::Remote->current_loop->watch_time(
177 every => $self->watchdog_timeout / 3,
179 unless(defined($conn)) {
180 log_trace { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
181 Object::Remote->current_loop->unwatch_time($timer_id);
185 Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
186 #we do not want to block in the run loop so send the
187 #update off and ignore any result, we don't need it
189 $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
196 my $connection_timeout = $self->timeout;
197 my $watchdog_timeout = $self->watchdog_timeout;
200 require Object::Remote::FatNode;
202 if (defined($connection_timeout)) {
203 $text .= "alarm($connection_timeout);\n";
206 if (defined($watchdog_timeout)) {
207 $text .= "my \$WATCHDOG_TIMEOUT = $watchdog_timeout;\n";
209 $text .= "my \$WATCHDOG_TIMEOUT = undef;\n";
213 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
214 $Object::Remote::FatNode::DATA = <<'ENDFAT';
216 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
219 eval $Object::Remote::FatNode::DATA;
223 $text .= "__END__\n";