X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FObject%2FRemote%2FConnection.pm;h=5d4f4b6688cea29dd40d9db86c0f13275bfad28b;hb=1673aa538a25ee18a7e8b2af7d039f989f71c737;hp=b8145abeaf7bc01d867a2fcd2972bd1d4486dc36;hpb=f4a8508058f7bad5052775a8df3e683527c73333;p=scpubgit%2FObject-Remote.git

diff --git a/lib/Object/Remote/Connection.pm b/lib/Object/Remote/Connection.pm
index b8145ab..5d4f4b6 100644
--- a/lib/Object/Remote/Connection.pm
+++ b/lib/Object/Remote/Connection.pm
@@ -16,39 +16,9 @@ use Module::Runtime qw(use_module);
 use Scalar::Util qw(weaken blessed refaddr openhandle);
 use JSON::PP qw(encode_json);
 use Moo;
+use Carp qw(croak);
 
-BEGIN { 
-  router()->exclude_forwarding;
-
-  #this will reap child processes as soon
-  #as they are done executing so the process
-  #table cleans up as fast as possible but
-  #anything that needs to call waitpid()
-  #in the future to get the exit value of
-  #a child will get trash results if
-  #the signal handler was running. 
-  #If creating a child and getting the
-  #exit value is required then set
-  #a localized version of the signal
-  #handler for CHLD to be 'IGNORE'
-  #in the smallest block possible
-  #and outside the block send
-  #the process a CHLD signal
-  #to reap anything that may
-  #have exited while blocked
-  #in waitpid() 
-  $SIG{CHLD} = sub { 
-    my $kid; 
-    log_trace { "CHLD signal handler is executing" };
-    do {
-      $kid = waitpid(-1, WNOHANG);
-      log_debug { "waitpid() returned '$kid'" };
-    } while $kid > 0;
-    log_trace { "CHLD signal handler is done" };
-  };
-  
-  $SIG{PIPE} = sub { log_debug { "Got a PIPE signal" } };      
-}
+BEGIN { router()->exclude_forwarding }
 
 END {
   log_debug { "Killing all child processes in the process group" };
@@ -62,9 +32,9 @@ has _id => ( is => 'ro', required => 1, default => sub { our $NEXT_CONNECTION_ID
 has send_to_fh => (
   is => 'ro', required => 1,
   trigger => sub {
-      my $self = $_[0];
-      $_[1]->autoflush(1);
-      Dlog_trace { my $id = $self->_id; "connection had send_to_fh set to $_"  } $_[1];
+    my $self = $_[0];
+    $_[1]->autoflush(1);
+    Dlog_trace { my $id = $self->_id; "connection had send_to_fh set to $_"  } $_[1];
   },
 );
 
@@ -73,11 +43,11 @@ has read_channel => (
   trigger => sub {
     my ($self, $ch) = @_;
     my $id = $self->_id; 
-    Dlog_trace { "trigger for read_channel has been invoked for connection $id; file handle is $_" } $ch->fh; 
+    Dlog_trace { "trigger for read_channel has been invoked for connection $id; file handle is $_" } $ch->fh;
     weaken($self);
     $ch->on_line_call(sub { $self->_receive(@_) });
     $ch->on_close_call(sub { 
-      log_trace { "invoking 'done' on on_close handler for connection id '$id'" }; 
+      log_trace { "invoking 'done' on on_close handler for connection id '$id'" };
       $self->on_close->done(@_);
     });
   },
@@ -85,7 +55,10 @@ has read_channel => (
 
 has on_close => (
   is => 'rw', default => sub { $_[0]->_install_future_handlers(CPS::Future->new) },
-  trigger => \&_install_future_handlers,
+  trigger => sub {
+    log_trace { "Installing handlers into future via trigger" };
+    $_[0]->_install_future_handlers($_[1])
+  },
 );
 
 has child_pid => (is => 'ro');
@@ -111,33 +84,69 @@ has _json => (
 );
 
 after BUILD => sub {
-  my ($self) = @_; 
-  
-  return unless defined $self->child_pid; 
+  my ($self) = @_;
+  my $pid = $self->child_pid;
   
-  log_debug { "Setting process group of child process" };
+  unless (defined $pid) {
+    log_trace { "After BUILD invoked for connection but there was no pid" };
+    return;
+  }
+    
+  log_trace { "Setting process group of child process '$pid'" };
   
   setpgrp($self->child_pid, 1);
 };
 
 sub BUILD { }
 
+sub is_valid {
+  my ($self) = @_;
+  my $closed = $self->on_close->is_ready;
+  
+  log_trace { "Connection closed: $closed" };
+  return ! $closed;
+}
+
 sub _fail_outstanding {
   my ($self, $error) = @_;
-  Dlog_debug { "Failing outstanding futures with '$error' for connection $_" } $self->_id;
   my $outstanding = $self->outstanding_futures;
-  $_->fail("$error\n") for values %$outstanding;
+  
+  Dlog_debug { 
+    sprintf "Failing %i outstanding futures with '$error'", scalar(keys(%$outstanding))
+  };
+
+  foreach(keys(%$outstanding)) {
+    log_trace { "Failing future for $_" };
+    my $future = $outstanding->{$_};
+    $future->fail("$error\n");
+  }
+
   %$outstanding = ();
   return;
 }
 
 sub _install_future_handlers {
     my ($self, $f) = @_;
-    Dlog_trace { "trigger for on_close has been invoked for connection $_" } $self->_id;
+    Dlog_trace { "Installing handlers into future for connection $_" } $self->_id;
     weaken($self);
     $f->on_done(sub {
-      Dlog_trace { "failing all of the outstanding futures for connection $_" } $self->_id;
+      my $pid = $self->child_pid;
+      Dlog_trace { "Executing on_done handler in future for connection $_" } $self->_id;
       $self->_fail_outstanding("Object::Remote connection lost: " . ($f->get)[0]);
+      return unless defined $pid;
+      log_debug { "Waiting for child '$pid' to exit" };
+      my $ret = waitpid($pid, 0);
+      if ($ret != $pid) {
+        log_debug { "Waited for pid $pid but waitpid() returned $ret" };
+        return;
+      } elsif ($? & 127) {
+          log_warn { "Remote interpreter did not exit cleanly" };
+      } else {
+        log_verbose {
+          my $exit_value = $? >> 8;
+          "Remote Perl interpreter exited with value '$exit_value'"
+        };
+      }
     });
     return $f; 
 };
@@ -293,6 +302,9 @@ sub register_remote {
 sub send_free {
   my ($self, $id) = @_;
   Dlog_trace { "sending request to free object '$id' for connection $_" } $self->_id;
+  #TODO this shows up some times when a remote side dies in the middle of a remote
+  #method invocation - possibly only when the object is being constructed?
+  #(in cleanup) Use of uninitialized value $id in delete at ../Object-Remote/lib/Object/Remote/Connection.
   delete $self->remote_objects_by_id->{$id};
   $self->_send([ free => $id ]);
 }
@@ -328,6 +340,11 @@ sub send_discard {
 sub _send {
   my ($self, $to_send) = @_;
   my $fh = $self->send_to_fh;
+  
+  unless ($self->is_valid) {
+    croak "Attempt to invoke _send on a connection that is not valid";
+  }
+  
   Dlog_trace { "Starting to serialize data in argument to _send for connection $_" } $self->_id;
   my $serialized = $self->_serialize($to_send)."\n";
   Dlog_trace { my $l = length($serialized); "serialization is completed; sending '$l' characters of serialized data to $_" } $fh;
@@ -342,7 +359,8 @@ sub _send {
     
   if ($@) {
     Dlog_debug { "exception encountered when trying to write to file handle $_: $@" } $fh;
-    my $error = $@; chomp($error);
+    my $error = $@;
+    chomp($error);
     $self->on_close->done("could not write to file handle: $error") unless $self->on_close->is_ready;
     return; 
   }