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=0964863b82024bf519f5e308e196ad45bdbf0aa3;hp=815ef3e61d9b651197ba36fb09ded8ccd4c09fef;hb=173c4fd41ad64aaa8e5f3af1596612f6a6b5ee81;hpb=5d59cb9859e004df5cde5d83aa7230e621a28b95

diff --git a/lib/Object/Remote/Role/Connector/PerlInterpreter.pm b/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
index 815ef3e..0964863 100644
--- a/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
+++ b/lib/Object/Remote/Role/Connector/PerlInterpreter.pm
@@ -1,17 +1,30 @@
 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 );
-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 ulimit => ( is => 'ro');
+has nice => ( is => 'ro');
+has watchdog_timeout => ( is => 'ro', required => 1, default => sub { undef });
+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) =
@@ -20,9 +33,30 @@ sub _build_module_sender {
   return $hook ? $hook->sender : Object::Remote::ModuleSender->new;
 }
 
-has perl_command => (is => 'lazy');
+sub _build_perl_command {
+  my ($self) = @_;
+  my $nice = $self->nice;
+  my $ulimit = $self->ulimit;
+  my $perl_path = 'perl';
+  my $shell_code = '';
 
-sub _build_perl_command { [ 'perl', '-' ] }
+  if (defined($ulimit)) {
+    $shell_code .= "ulimit $ulimit || exit 1; ";
+  }
+
+  if (defined($nice)) {
+    $shell_code .= "nice -n $nice ";
+  }
+
+  if (defined($ENV{OBJECT_REMOTE_PERL_BIN})) {
+    log_debug { "Using OBJECT_REMOTE_PERL_BIN environment variable as perl path" };
+    $perl_path = $ENV{OBJECT_REMOTE_PERL_BIN};
+  }
+
+  $shell_code .= $perl_path . ' -';
+
+  return [ 'bash', '-c', $shell_code ];
+}
 
 around connect => sub {
   my ($orig, $self) = (shift, shift);
@@ -30,8 +64,9 @@ 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',
@@ -48,26 +83,72 @@ sub final_perl_command { shift->perl_command }
 
 sub _start_perl {
   my $self = shift;
-  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]': $!";
+  
+  $self->_set_pid($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,
                     on_write_ready => sub {
-                      my $len = syswrite($foreign_stdin, $to_send, 4096);
+                      my $len = syswrite($foreign_stdin, $to_send, 32768);
                       if (defined $len) {
                         substr($to_send, 0, $len) = '';
                       }
@@ -79,7 +160,7 @@ sub _open2_for {
                                       ->unwatch_io(
                                           handle => $foreign_stdin,
                                           on_write_ready => 1
-                                        );
+                                      );
                       } else {
                           log_trace { "Sent $len bytes of fatnode data to remote side" };
                       }
@@ -88,12 +169,65 @@ sub _open2_for {
   return ($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";
+  }
+  
+  $text .= '$Object::Remote::FatNode::REMOTE_NODE = "1";' . "\n";
+  
   $text .= <<'END';
 $INC{'Object/Remote/FatNode.pm'} = __FILE__;
 $Object::Remote::FatNode::DATA = <<'ENDFAT';
@@ -104,6 +238,7 @@ END
 eval $Object::Remote::FatNode::DATA;
 die $@ if $@;
 END
+  
   $text .= "__END__\n";
   return $text;
 }