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 #SSH requires the entire remote command to be
34 #given as one single argument to the ssh
35 #command line program so this jumps through
38 #TODO this is SSH's problem not perl's so move
39 #this to the SSH connector
40 sub _build_perl_command {
42 my $nice = $self->nice;
43 my $ulimit = $self->ulimit;
44 my $shell_code = 'sh -c "';
46 if (defined($ulimit)) {
47 $shell_code .= "ulimit -v $ulimit; ";
51 $shell_code .= "nice -n $nice ";
54 $shell_code .= 'perl -"';
56 return [ $shell_code ];
59 around connect => sub {
60 my ($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', Object::Remote::Logging->arg_router);
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
123 handle => $foreign_stderr,
127 Dlog_trace { "got $len characters of stderr data for connection" };
128 print $given_stderr $buf or die "could not send stderr data: $!";
134 return ($foreign_stdin, $foreign_stdout, $pid);
139 my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
140 my $to_send = $self->fatnode_text;
141 log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
142 Object::Remote->current_loop
144 handle => $foreign_stdin,
145 on_write_ready => sub {
146 my $len = syswrite($foreign_stdin, $to_send, 32768);
148 substr($to_send, 0, $len) = '';
150 # if the stdin went away, we'll never get Shere
151 # so it's not a big deal to simply give up on !defined
152 if (!defined($len) or 0 == length($to_send)) {
153 log_trace { "Got EOF or error when writing fatnode data to filehandle, unwatching it" };
154 Object::Remote->current_loop
156 handle => $foreign_stdin,
160 log_trace { "Sent $len bytes of fatnode data to remote side" };
164 return ($foreign_stdin, $foreign_stdout, $pid);
167 sub _setup_watchdog_reset {
168 my ($self, $conn) = @_;
171 return unless $self->watchdog_timeout;
173 Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
177 $timer_id = Object::Remote->current_loop->watch_time(
178 every => $self->watchdog_timeout / 3,
180 unless(defined($conn)) {
181 log_trace { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
182 Object::Remote->current_loop->unwatch_time($timer_id);
186 Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
187 #we do not want to block in the run loop so send the
188 #update off and ignore any result, we don't need it
190 $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
199 require Object::Remote::FatNode;
201 if (defined($self->watchdog_timeout)) {
202 $text = "my \$WATCHDOG_TIMEOUT = '" . $self->watchdog_timeout . "';\n";
203 $text .= "alarm(\$WATCHDOG_TIMEOUT);\n";
205 $text = "my \$WATCHDOG_TIMEOUT = undef;\n";
208 $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
209 if $ENV{OBJECT_REMOTE_DEBUG};
211 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
212 $Object::Remote::FatNode::DATA = <<'ENDFAT';
214 $text .= do { no warnings 'once'; $Object::Remote::FatNode::DATA };
217 eval $Object::Remote::FatNode::DATA;
221 $text .= "__END__\n";