1 package Object::Remote::Connection;
3 use Object::Remote::Future;
4 use Object::Remote::Null;
5 use Object::Remote::Handle;
8 use Module::Runtime qw(use_module);
9 use Scalar::Util qw(weaken blessed refaddr);
10 use JSON::PP qw(encode_json);
13 our $DEBUG = !!$ENV{OBJECT_REMOTE_DEBUG};
16 is => 'ro', required => 1,
17 trigger => sub { $_[1]->autoflush(1) },
20 has receive_from_fh => (
21 is => 'ro', required => 1,
25 Object::Remote->current_loop
28 on_read_ready => sub { $self->_receive_data_from($fh) }
33 has on_close => (is => 'rw', default => sub {});
35 has child_pid => (is => 'ro');
37 has is_ready => (is => 'rwp', trigger => sub {
38 my ($self, $value) = @_;
39 $self->ready_future->done if $value;
42 has ready_future => (is => 'lazy');
44 sub _build_ready_future { CPS::Future->new }
46 has _receive_data_buffer => (is => 'ro', default => sub { my $x = ''; \$x });
48 has local_objects_by_id => (is => 'ro', default => sub { {} });
50 has remote_objects_by_id => (is => 'ro', default => sub { {} });
55 _deserialize => 'decode',
61 weaken(my $self = shift);
62 my $remotes = $self->remote_objects_by_id;
63 JSON::PP->new->filter_json_single_key_object(
64 __remote_object__ => sub {
66 return bless({}, 'Object::Remote::Null') if $id eq 'NULL';
69 or Object::Remote::Handle->new(connection => $self, id => $id)
76 unshift our @Guess, sub { blessed($_[0]) ? $_[0] : undef };
77 eval { require Object::Remote::Connector::Local };
78 eval { require Object::Remote::Connector::LocalSudo };
79 eval { require Object::Remote::Connector::SSH };
83 my ($class, $spec) = @_;
84 foreach my $poss (do { our @Guess }) {
85 if (my $obj = $poss->($spec)) { return $obj }
87 die "Couldn't figure out what to do with ${spec}";
91 my ($self, $remote) = @_;
92 weaken($self->remote_objects_by_id->{$remote->id} = $remote);
98 return if $self->is_ready;
99 await_future($self->ready_future);
103 my ($self, $id) = @_;
104 delete $self->remote_objects_by_id->{$id};
105 $self->_send([ free => $id ]);
109 my ($self, $type, @call) = @_;
111 unshift @call, $type => my $future = CPS::Future->new;
113 $self->_send(\@call);
119 my ($self, $type, @call) = @_;
121 unshift @call, $type => { __remote_object__ => 'NULL' };
123 $self->_send(\@call);
127 my ($self, $to_send) = @_;
129 $self->await_ready unless $self->is_ready;
131 print { $self->send_to_fh } $self->_serialize($to_send)."\n";
135 my ($self, $data) = @_;
138 my $flat = $self->_encode($self->_deobjectify($data));
139 warn "$$ >>> ${flat}\n" if $DEBUG;
142 my $err = $@; # won't get here if the eval doesn't die
143 # don't keep refs to new things
144 delete @{$self->local_objects_by_id}{@New_Ids};
145 die "Error serializing: $err";
150 my ($self, $data) = @_;
151 if (blessed($data)) {
152 my $id = refaddr($data);
153 $self->local_objects_by_id->{$id} ||= do {
154 push our(@New_Ids), $id;
157 return +{ __remote_object__ => $id };
158 } elsif (my $ref = ref($data)) {
159 if ($ref eq 'HASH') {
160 return +{ map +($_ => $self->_deobjectify($data->{$_})), keys %$data };
161 } elsif ($ref eq 'ARRAY') {
162 return [ map $self->_deobjectify($_), @$data ];
164 die "Can't collapse reftype $ref";
167 return $data; # plain scalar
170 sub _receive_data_from {
171 my ($self, $fh) = @_;
172 my $rb = $self->_receive_data_buffer;
173 my $ready = $self->is_ready;
174 if (sysread($fh, $$rb, 1024, length($$rb)) > 0) {
175 while ($$rb =~ s/^(.*)\n//) {
180 die "New remote container did not send Shere - got ${line}"
181 unless $line eq "Shere";
182 $self->_set_is_ready($ready = 1);
186 $self->on_close->done();
191 my ($self, $flat) = @_;
192 warn "$$ <<< $flat\n" if $DEBUG;
193 my ($type, @rest) = eval { @{$self->_deserialize($flat)} }
194 or do { warn "Deserialize failed for ${flat}: $@"; return };
195 eval { $self->${\"receive_${type}"}(@rest); 1 }
196 or do { warn "Receive failed for ${flat}: $@"; return };
201 my ($self, $id) = @_;
202 delete $self->local_objects_by_id->{$id}
203 or warn "Free: no such object $id";
208 my ($self, $future, $id, @rest) = @_;
209 $future->{method} = 'call_discard_free';
210 my $local = $self->local_objects_by_id->{$id}
211 or do { $future->fail("No such object $id"); return };
212 $self->_invoke($future, $local, @rest);
215 sub receive_call_free {
216 my ($self, $future, $id, @rest) = @_;
217 $self->receive_call($future, $id, undef, @rest);
218 $self->receive_free($id);
221 sub receive_class_call {
222 my ($self, $future, $class, @rest) = @_;
223 $future->{method} = 'call_discard_free';
224 eval { use_module($class) }
225 or do { $future->fail("Error loading ${class}: $@"); return };
226 $self->_invoke($future, $class, @rest);
230 my ($self, $future, $local, $ctx, $method, @args) = @_;
231 if ($method =~ /^start::/) {
232 my $f = $local->$method(@args);
233 $f->on_done(sub { undef($f); $future->done(@_) });
235 $f->on_fail(sub { undef($f); $future->fail(@_) });
238 my $do = sub { $local->$method(@args) };
242 ? ($ctx ? $do->() : scalar($do->()))
246 } or do { $future->fail($@); return; };
251 my ($self, $gd) = @_;
253 Object::Remote->current_loop
255 handle => $self->receive_from_fh,