package Object::Remote::Connection;
+use Object::Remote::Logging qw (:log :dlog get_router);
use Object::Remote::Future;
use Object::Remote::Null;
use Object::Remote::Handle;
use Object::Remote::CodeContainer;
use Object::Remote::GlobProxy;
use Object::Remote::GlobContainer;
-use Object::Remote::Logging qw (:log :dlog);
+use Object::Remote::Tied;
use Object::Remote;
use Symbol;
use IO::Handle;
+use POSIX ":sys_wait_h";
use Module::Runtime qw(use_module);
-use Scalar::Util qw(weaken blessed refaddr);
+use Scalar::Util qw(weaken blessed refaddr openhandle);
use JSON::PP qw(encode_json);
use Moo;
-our $DEBUG = !!$ENV{OBJECT_REMOTE_DEBUG};
+BEGIN {
+ get_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" } };
+}
+
+END {
+ log_debug { "Killing all child processes in the process group" };
+
+ #send SIGINT to the process group for our children
+ kill(1, -2);
+}
+
+has _id => ( is => 'ro', required => 1, default => sub { our $NEXT_CONNECTION_ID++ } );
has send_to_fh => (
is => 'ro', required => 1,
- trigger => sub { $_[1]->autoflush(1) },
+ trigger => sub {
+ my $self = $_[0];
+ $_[1]->autoflush(1);
+ Dlog_trace { my $id = $self->_id; "connection had send_to_fh set to $_" } $_[1];
+ },
);
has read_channel => (
is => 'ro', required => 1,
trigger => sub {
my ($self, $ch) = @_;
+ my $id = $self->_id;
+ Dlog_trace { "trigger for read_channel has been invoked for connection $id; file handle is $_" } $ch->fh;
weaken($self);
$ch->on_line_call(sub { $self->_receive(@_) });
- $ch->on_close_call(sub { $self->on_close->done(@_) });
+ $ch->on_close_call(sub {
+ log_trace { "invoking 'done' on on_close handler for connection id '$id'" };
+ $self->on_close->done(@_);
+ });
},
);
has on_close => (
- is => 'ro', default => sub { CPS::Future->new },
- trigger => sub {
- my ($self, $f) = @_;
- weaken($self);
- $f->on_done(sub {
- $self->_fail_outstanding("Connection lost: ".($f->get)[0]);
- });
- }
+ is => 'rw', default => sub { $_[0]->_install_future_handlers(CPS::Future->new) },
+ trigger => \&_install_future_handlers,
);
has child_pid => (is => 'ro');
has outstanding_futures => (is => 'ro', default => sub { {} });
-sub _fail_outstanding {
- my ($self, $error) = @_;
- my $outstanding = $self->outstanding_futures;
- $_->fail($error) for values %$outstanding;
- %$outstanding = ();
- return;
-}
-
has _json => (
is => 'lazy',
handles => {
},
);
+after BUILD => sub {
+ my ($self) = @_;
+
+ return unless defined $self->child_pid;
+
+ log_debug { "Setting process group of child process" };
+
+ setpgrp($self->child_pid, 1);
+};
+
+sub BUILD { }
+
+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 %$outstanding;
+ %$outstanding = ();
+ return;
+}
+
+sub _install_future_handlers {
+ my ($self, $f) = @_;
+ Dlog_trace { "trigger for on_close has been invoked for connection $_" } $self->_id;
+ weaken($self);
+ $f->on_done(sub {
+ Dlog_trace { "failing all of the outstanding futures for connection $_" } $self->_id;
+ $self->_fail_outstanding("Object::Remote connection lost: " . ($f->get)[0]);
+ });
+ return $f;
+};
+
sub _id_to_remote_object {
my ($self, $id) = @_;
+ Dlog_trace { "fetching proxy for remote object with id '$id' for connection $_" } $self->_id;
return bless({}, 'Object::Remote::Null') if $id eq 'NULL';
(
$self->remote_objects_by_id->{$id}
__local_object__ => sub {
$self->local_objects_by_id->{$_[0]}
}
- );
+ )->filter_json_single_key_object(
+ __remote_tied_hash__ => sub {
+ my %tied_hash;
+ tie %tied_hash, 'Object::Remote::Tied', $self->_id_to_remote_object(@_);
+ return \%tied_hash;
+ }
+ )->filter_json_single_key_object(
+ __remote_tied_array__ => sub {
+ my @tied_array;
+ tie @tied_array, 'Object::Remote::Tied', $self->_id_to_remote_object(@_);
+ return \@tied_array;
+ }
+ );
+}
+
+sub _load_if_possible {
+ my ($class) = @_;
+
+ use_module($class);
+
+ if ($@) {
+ log_debug { "Attempt at loading '$class' failed with '$@'" };
+ }
+
}
BEGIN {
unshift our @Guess, sub { blessed($_[0]) ? $_[0] : undef };
- eval { require Object::Remote::Connector::Local };
- eval { require Object::Remote::Connector::LocalSudo };
- eval { require Object::Remote::Connector::SSH };
- eval { require Object::Remote::Connector::UNIX };
+ map _load_if_possible($_), qw(
+ Object::Remote::Connector::Local
+ Object::Remote::Connector::LocalSudo
+ Object::Remote::Connector::SSH
+ Object::Remote::Connector::UNIX
+ );
}
-sub new_from_spec {
- my ($class, $spec) = @_;
- return $spec if blessed $spec;
+sub conn_from_spec {
+ my ($class, $spec, @args) = @_;
foreach my $poss (do { our @Guess }) {
- if (my $conn = $poss->($spec)) {
- return $conn->maybe::start::connect;
+ if (my $conn = $poss->($spec, @args)) {
+ return $conn;
}
}
- die "Couldn't figure out what to do with ${spec}";
+
+ return undef;
+}
+
+sub new_from_spec {
+ my ($class, $spec) = @_;
+ return $spec if blessed $spec;
+ my $conn = $class->conn_from_spec($spec);
+
+ die "Couldn't figure out what to do with ${spec}"
+ unless defined $conn;
+
+ return $conn->maybe::start::connect;
}
sub remote_object {
sub connect {
my ($self, $to) = @_;
- Dlog_debug { "Creating connection to remote node $_" } $to;
+ Dlog_debug { "Creating connection to remote node '$to' for connection $_" } $self->_id;
return await_future(
$self->send_class_call(0, 'Object::Remote', connect => $to)
);
sub remote_sub {
my ($self, $sub) = @_;
my ($pkg, $name) = $sub =~ m/^(.*)::([^:]+)$/;
- log_debug { "Invoking remote sub '$sub'" };
+ Dlog_debug { "Invoking remote sub '$sub' for connection $_" } $self->_id;
return await_future($self->send_class_call(0, $pkg, can => $name));
}
sub send_class_call {
my ($self, $ctx, @call) = @_;
- log_trace { "Sending a non-blocking class call" };
+ Dlog_trace { "Sending a class call for connection $_" } $self->_id;
$self->send(call => class_call_handler => $ctx => call => @call);
}
sub register_remote {
my ($self, $remote) = @_;
- log_trace { my $i = $remote->id; "Registered a remote object with id of '$i'" };
+ Dlog_trace { my $i = $remote->id; "Registered a remote object with id of '$i' for connection $_" } $self->_id;
weaken($self->remote_objects_by_id->{$remote->id} = $remote);
return $remote;
}
sub send_free {
my ($self, $id) = @_;
- log_debug { "sending request to free object '$id'" };
+ Dlog_trace { "sending request to free object '$id' for connection $_" } $self->_id;
delete $self->remote_objects_by_id->{$id};
$self->_send([ free => $id ]);
}
sub _send {
my ($self, $to_send) = @_;
my $fh = $self->send_to_fh;
+ Dlog_trace { "Starting to serialize data in argument to _send for connection $_" } $self->_id;
my $serialized = $self->_serialize($to_send)."\n";
- Dlog_debug { my $l = length($serialized); "Sending '$l' characters of serialized data to $_" } $fh;
- #TODO this is very risky for deadlocks unless it's set to non-blocking and then with out extra
- #logic it could easily do short-writes to the remote side
- my $ret = print $fh $serialized;
- Dlog_trace { my $r = defined $ret ? $ret : 'undef'; "print() returned $r with $_" } $fh;
- #TODO hrm reason print's return value was ignored?
- die "could not write to filehandle: $!" unless $ret;
+ Dlog_trace { my $l = length($serialized); "serialization is completed; sending '$l' characters of serialized data to $_" } $fh;
+ my $ret;
+ eval {
+ #TODO this should be converted over to a non-blocking ::WriteChannel class
+ die "filehandle is not open" unless openhandle($fh);
+ log_trace { "file handle has passed openhandle() test; printing to it" };
+ $ret = print $fh $serialized;
+ die "print was not successful: $!" unless defined $ret
+ };
+
+ if ($@) {
+ Dlog_debug { "exception encountered when trying to write to file handle $_: $@" } $fh;
+ my $error = $@; chomp($error);
+ $self->on_close->done("could not write to file handle: $error") unless $self->on_close->is_ready;
+ return;
+ }
+
return $ret;
}
local our @New_Ids = (-1);
return eval {
my $flat = $self->_encode($self->_deobjectify($data));
- warn "$$ >>> ${flat}\n" if $DEBUG;
$flat;
} || do {
my $err = $@; # won't get here if the eval doesn't die
}
} elsif (my $ref = ref($data)) {
if ($ref eq 'HASH') {
- return +{ map +($_ => $self->_deobjectify($data->{$_})), keys %$data };
+ my $tied_to = tied(%$data);
+ if(defined($tied_to)) {
+ return +{__remote_tied_hash__ => $self->_local_object_to_id($tied_to)};
+ } else {
+ return +{ map +($_ => $self->_deobjectify($data->{$_})), keys %$data };
+ }
} elsif ($ref eq 'ARRAY') {
- return [ map $self->_deobjectify($_), @$data ];
+ my $tied_to = tied(@$data);
+ if (defined($tied_to)) {
+ return +{__remote_tied_array__ => $self->_local_object_to_id($tied_to)};
+ } else {
+ return [ map $self->_deobjectify($_), @$data ];
+ }
} elsif ($ref eq 'CODE') {
my $id = $self->_local_object_to_id(
Object::Remote::CodeContainer->new(code => $data)
sub _receive {
my ($self, $flat) = @_;
- warn "$$ <<< $flat\n" if $DEBUG;
+ Dlog_trace { my $l = length($flat); "Starting to deserialize $l characters of data for connection $_" } $self->_id;
my ($type, @rest) = eval { @{$self->_deserialize($flat)} }
or do { warn "Deserialize failed for ${flat}: $@"; return };
+ Dlog_trace { "deserialization complete for connection $_" } $self->_id;
eval { $self->${\"receive_${type}"}(@rest); 1 }
or do { warn "Receive failed for ${flat}: $@"; return };
return;
sub receive_free {
my ($self, $id) = @_;
+ Dlog_trace { "got a receive_free for object '$id' for connection $_" } $self->_id;
delete $self->local_objects_by_id->{$id}
or warn "Free: no such object $id";
return;
sub receive_call {
my ($self, $future_id, $id, @rest) = @_;
+ Dlog_trace { "got a receive_call for object '$id' for connection $_" } $self->_id;
my $future = $self->_id_to_remote_object($future_id);
$future->{method} = 'call_discard_free';
my $local = $self->local_objects_by_id->{$id}
sub receive_call_free {
my ($self, $future, $id, @rest) = @_;
+ Dlog_trace { "got a receive_call_free for object '$id' for connection $_" } $self->_id;
$self->receive_call($future, $id, undef, @rest);
$self->receive_free($id);
}
sub _invoke {
my ($self, $future, $local, $ctx, $method, @args) = @_;
+ Dlog_trace { "got _invoke for a method named '$method' for connection $_" } $self->_id;
if ($method =~ /^start::/) {
my $f = $local->$method(@args);
$f->on_done(sub { undef($f); $future->done(@_) });
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