package Object::Remote::Connection;
+use Object::Remote::Logging qw (:log :dlog 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};
-#numbering each connection allows it to be
-#tracked along with file handles in
-#the logs
-BEGIN { our $NEXT_CONNECTION_ID = 0 }
+BEGIN {
+ router()->exclude_forwarding;
+ $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 $NEXT_CONNECTION_ID++ } );
has send_to_fh => (
is => 'ro', required => 1,
trigger => sub {
my ($self, $ch) = @_;
- Dlog_trace { my $id = $self->_id; "trigger for read_channel has been invoked for connection $id; file handle is " } $ch->fh;
+ 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 },
+ is => 'rw', default => sub { $_[0]->_install_future_handlers(CPS::Future->new) },
trigger => sub {
- my ($self, $f) = @_;
- Dlog_trace { "trigger for on_close has been invoked for connection $_" } $self->_id;
- weaken($self);
- $f->on_done(sub {
- $self->_fail_outstanding("Connection lost: ".($f->get)[0]);
- });
- }
+ log_trace { "Installing handlers into future via trigger" };
+ $_[0]->_install_future_handlers($_[1])
+ },
);
has child_pid => (is => 'ro');
has outstanding_futures => (is => 'ro', default => sub { {} });
-sub _fail_outstanding {
- my ($self, $error) = @_;
- Dlog_debug { "Failing outstanding futures with '$error' for connection $_" } $self->_id;
- my $outstanding = $self->outstanding_futures;
- $_->fail($error) for values %$outstanding;
- %$outstanding = ();
- return;
-}
-
has _json => (
is => 'lazy',
handles => {
},
);
+after BUILD => sub {
+ my ($self) = @_;
+ my $pid = $self->child_pid;
+
+ 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($self->child_pid, 1);
+};
+
+sub BUILD { }
+
+sub _fail_outstanding {
+ my ($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 { "Installing handlers into future for connection $_" } $self->_id;
+ weaken($self);
+ $f->on_done(sub {
+ 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;
+};
+
sub _id_to_remote_object {
my ($self, $id) = @_;
Dlog_trace { "fetching proxy for remote object with id '$id' for connection $_" } $self->_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;
- Dlog_debug { "creating a new connection from spec" };
+sub conn_from_spec {
+ my ($class, $spec, @args) = @_;
foreach my $poss (do { our @Guess }) {
- if (my $conn = $poss->($spec)) {
- #Dlog_debug { my $id = $conn->_id; "created connection $id for spec $_" } $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 send_free {
my ($self, $id) = @_;
- Dlog_debug { "sending request to free object '$id' for connection $_" } $self->_id;
+ Dlog_trace { "sending request to free object '$id' for connection $_" } $self->_id;
delete $self->remote_objects_by_id->{$id};
$self->_send([ free => $id ]);
}
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); "serialization is completed; 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;
}
sub _serialize {
my ($self, $data) = @_;
local our @New_Ids = (-1);
- Dlog_debug { "starting to serialize data for connection $_" } $self->_id;
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 };
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