X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=scpubgit%2FObject-Remote.git;a=blobdiff_plain;f=lib%2FObject%2FRemote%2FRole%2FConnector%2FPerlInterpreter.pm;h=c430fa6e48dafdcd76a8a3bb5986056a9b51cecf;hp=b8e3f755432e4685d07d1338364d6702c631923e;hb=55c0d0209fa9d9265ff178f54ae9fe5fdddef3c1;hpb=9031635d18e754da303557b656c63ce8e7eb8e77

diff --git a/lib/Object/Remote/Role/Connector/PerlInterpreter.pm b/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
index b8e3f75..c430fa6 100644
--- a/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
+++ b/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
@@ -1,17 +1,29 @@
 package Object::Remote::Role::Connector::PerlInterpreter;
 
-use IPC::Open2;
+use IPC::Open3;
 use IO::Handle;
+use Symbol;
+use Object::Remote::Logging qw(:log :dlog router);
 use Object::Remote::ModuleSender;
 use Object::Remote::Handle;
 use Object::Remote::Future;
-use Object::Remote::Logging qw( :log :dlog );
-use Scalar::Util qw(blessed);
+use Scalar::Util qw(blessed weaken);
 use Moo::Role;
 
 with 'Object::Remote::Role::Connector';
 
 has module_sender => (is => 'lazy');
+has watchdog_timeout => ( is => 'ro', required => 1, default => sub { undef });
+has forward_env => (is => 'ro', required => 1, builder => 1);
+has perl_command => (is => 'lazy');
+has pid => (is => 'rwp');
+has connection_id => (is => 'rwp');
+
+#if no child_stderr file handle is specified then stderr
+#of the child will be connected to stderr of the parent
+has stderr => ( is => 'rw', default => sub { undef } );
+
+BEGIN { router()->exclude_forwarding; }
 
 sub _build_module_sender {
   my ($hook) =
@@ -20,15 +32,23 @@ sub _build_module_sender {
   return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
 }
 
-has perl_command => (is => 'lazy');
+#By policy object-remote does not invoke a shell
+sub _build_perl_command {
+  my $perl_bin = 'perl';
+
+  if (exists $ENV{OBJECT_REMOTE_PERL_BIN}) {
+    $perl_bin = $ENV{OBJECT_REMOTE_PERL_BIN};
+  }
+  return [qw(perl -)];
+}
 
-#TODO convert nice value into optional feature enabled by
-#setting value of attribute
-#ulimit of ~500 megs of v-ram
-#TODO only works with ssh with quotes but only works locally
-#with out quotes
-sub _build_perl_command { [ 'sh', '-c', '"ulimit -v 500000; nice -n 15 perl -"' ] }
-#sub _build_perl_command { [ 'perl', '-' ] }
+sub _build_forward_env {
+  return [qw(
+    OBJECT_REMOTE_PERL_BIN
+    OBJECT_REMOTE_LOG_LEVEL OBJECT_REMOTE_LOG_FORMAT OBJECT_REMOTE_LOG_SELECTIONS
+    OBJECT_REMOTE_LOG_FORWARDING
+  )];
+}
 
 around connect => sub {
   my ($orig, $self) = (shift, shift);
@@ -36,8 +56,9 @@ around connect => sub {
   return future {
     $f->on_done(sub {
       my ($conn) = $f->get;
-      my $sub = $conn->remote_sub('Object::Remote::Logging::init_logging_forwarding');
-      $sub->('Object::Remote::Logging', Object::Remote::Logging->arg_router);
+      $self->_setup_watchdog_reset($conn);
+      my $sub = $conn->remote_sub('Object::Remote::Logging::init_remote_logging');
+      $sub->('Object::Remote::Logging', router => router(), connection_id => $conn->_id);
       Object::Remote::Handle->new(
         connection => $conn,
         class => 'Object::Remote::ModuleLoader',
@@ -54,23 +75,67 @@ sub final_perl_command { shift->perl_command }
 
 sub _start_perl {
   my $self = shift;
-  Dlog_debug { "invoking connection to perl interpreter using command line: $_" } @{$self->final_perl_command};
-  my $pid = open2(
-    my $foreign_stdout,
+  my $given_stderr = $self->stderr;
+  my $foreign_stderr;
+
+  Dlog_verbose {
+    s/\n/ /g; "invoking connection to perl interpreter using command line: $_"
+  } @{$self->final_perl_command};
+
+  if (defined($given_stderr)) {
+    #if the stderr data goes to an existing file handle
+    #an anonymous file handle is required
+    #as the other half of a pipe style file handle pair
+    #so the file handles can go into the run loop
+    $foreign_stderr = gensym();
+  } else {
+    #if no file handle has been specified
+    #for the child's stderr then connect
+    #the child stderr to the parent stderr
+    $foreign_stderr = ">&STDERR";
+  }
+
+  my $pid = open3(
     my $foreign_stdin,
+    my $foreign_stdout,
+    $foreign_stderr,
     @{$self->final_perl_command},
   ) or die "Failed to run perl at '$_[0]': $!";
-  Dlog_trace { "Connection to remote side successful; remote stdin and stdout: $_" } [ $foreign_stdin, $foreign_stdout ];
+
+  $self->_set_pid($pid);
+
+  if (defined($given_stderr)) {
+    Dlog_debug { "Child process STDERR is being handled via run loop" };
+
+    Object::Remote->current_loop
+                  ->watch_io(
+                      handle => $foreign_stderr,
+                      on_read_ready => sub {
+                        my $buf = '';
+                        my $len = sysread($foreign_stderr, $buf, 32768);
+                        if (!defined($len) or $len == 0) {
+                          log_trace { "Got EOF or error on child stderr, removing from watcher" };
+                          $self->stderr(undef);
+                          Object::Remote->current_loop->unwatch_io(
+                                         handle => $foreign_stderr,
+                                         on_read_ready => 1
+                                       );
+                          } else {
+                            Dlog_trace { "got $len characters of stderr data for connection" };
+                            print $given_stderr $buf or die "could not send stderr data: $!";
+                          }
+                         }
+                      );
+  }
+
   return ($foreign_stdin, $foreign_stdout, $pid);
 }
 
-#TODO open2() forks off a child and I have not been able to locate
-#a mechanism for reaping dead children so they don't become zombies
 sub _open2_for {
   my $self = shift;
   my ($foreign_stdin, $foreign_stdout, $pid) = $self->_start_perl(@_);
   my $to_send = $self->fatnode_text;
-  log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters"  };
+  log_debug { my $len = length($to_send); "Sending contents of fat node to remote node; size is '$len' characters" };
   Object::Remote->current_loop
                 ->watch_io(
                     handle => $foreign_stdin,
@@ -87,7 +152,7 @@ sub _open2_for {
                                       ->unwatch_io(
                                           handle => $foreign_stdin,
                                           on_write_ready => 1
-                                        );
+                                      );
                       } else {
                           log_trace { "Sent $len bytes of fatnode data to remote side" };
                       }
@@ -96,12 +161,72 @@ sub _open2_for {
   return ($foreign_stdin, $foreign_stdout, $pid);
 }
 
+sub _setup_watchdog_reset {
+  my ($self, $conn) = @_;
+  my $timer_id;
+
+  return unless $self->watchdog_timeout;
+
+  Dlog_trace { "Creating Watchdog management timer for connection id $_" } $conn->_id;
+
+  weaken($conn);
+
+  $timer_id = Object::Remote->current_loop->watch_time(
+    every => $self->watchdog_timeout / 3,
+    code => sub {
+      unless(defined($conn)) {
+        log_warn { "Weak reference to connection in Watchdog was lost, terminating update timer $timer_id" };
+        Object::Remote->current_loop->unwatch_time($timer_id);
+        return;
+      }
+
+      unless($conn->is_valid) {
+        log_warn { "Watchdog timer found an invalid connection, removing the timer" };
+        Object::Remote->current_loop->unwatch_time($timer_id);
+        return;
+      }
+
+      Dlog_trace { "Reseting Watchdog for connection id $_" } $conn->_id;
+      #we do not want to block in the run loop so send the
+      #update off and ignore any result, we don't need it
+      #anyway
+      $conn->send_class_call(0, 'Object::Remote::WatchDog', 'reset');
+    }
+  );
+
+  $conn->on_close->on_ready(sub {
+    log_debug { "Removing watchdog for connection that is now closed" };
+    Object::Remote->current_loop->unwatch_time($timer_id);
+  });
+}
+
 sub fatnode_text {
   my ($self) = @_;
-  require Object::Remote::FatNode;
+  my $connection_timeout = $self->timeout;
+  my $watchdog_timeout = $self->watchdog_timeout;
   my $text = '';
-  $text .= 'BEGIN { $ENV{OBJECT_REMOTE_DEBUG} = 1 }'."\n"
-    if $ENV{OBJECT_REMOTE_DEBUG};
+
+  require Object::Remote::FatNode;
+
+  if (defined($connection_timeout)) {
+    $text .= "alarm($connection_timeout);\n";
+  }
+
+  if (defined($watchdog_timeout)) {
+    $text .= "my \$WATCHDOG_TIMEOUT = $watchdog_timeout;\n";
+  } else {
+    $text .= "my \$WATCHDOG_TIMEOUT = undef;\n";
+  }
+
+  $text .= $self->_create_env_forward(@{$self->forward_env});
+
+  #Action at a distance but at least it's not spooky - the logging
+  #system needs to know if a node is remote but there is a period
+  #during init where the remote connection information has not been
+  #setup on the remote side yet so this flag allows a graceful
+  #degredation to happen
+  $text .= '$Object::Remote::FatNode::REMOTE_NODE = "1";' . "\n";
+
   $text .= <<'END';
 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
 $Object::Remote::FatNode::DATA = <<'ENDFAT';
@@ -112,8 +237,29 @@ END
 eval $Object::Remote::FatNode::DATA;
 die $@ if $@;
 END
+
   $text .= "__END__\n";
   return $text;
 }
 
+sub _create_env_forward {
+  my ($self, @env_names) = @_;
+  my $code = '';
+
+  foreach my $name (@env_names) {
+    next unless exists $ENV{$name};
+    my $value = $ENV{$name};
+    $name =~ s/'/\\'/g;
+    if(defined($value)) {
+      $value =~ s/'/\\'/g;
+      $value = "'$value'";
+    } else {
+      $value = 'undef';
+    }
+    $code .= "\$ENV{'$name'} = $value;\n";
+  }
+
+  return $code;
+}
+
 1;