Commit | Line | Data |
9e72f0cf |
1 | package Object::Remote::Connection; |
2 | |
dc28afe8 |
3 | use Object::Remote::Future; |
9d804009 |
4 | use Object::Remote::Null; |
676438a1 |
5 | use Object::Remote::Handle; |
fe6c9a7f |
6 | use Object::Remote::CodeContainer; |
ed5a8a8e |
7 | use Object::Remote::GlobProxy; |
8 | use Object::Remote::GlobContainer; |
9d64d2d9 |
9 | use Object::Remote::Logging qw (:log :dlog); |
7790ca36 |
10 | use Object::Remote::Tied; |
9e72f0cf |
11 | use Object::Remote; |
ed5a8a8e |
12 | use Symbol; |
9e72f0cf |
13 | use IO::Handle; |
14 | use Module::Runtime qw(use_module); |
f8080c1c |
15 | use Scalar::Util qw(weaken blessed refaddr openhandle); |
9e72f0cf |
16 | use JSON::PP qw(encode_json); |
17 | use Moo; |
18 | |
6db5156c |
19 | our $DEBUG = !!$ENV{OBJECT_REMOTE_DEBUG}; |
9031635d |
20 | #numbering each connection allows it to be |
21 | #tracked along with file handles in |
22 | #the logs |
23 | BEGIN { our $NEXT_CONNECTION_ID = 0 } |
24 | has _id => ( is => 'ro', required => 1, default => sub { our $NEXT_CONNECTION_ID++ } ); |
ad4f54b2 |
25 | |
9e72f0cf |
26 | has send_to_fh => ( |
27 | is => 'ro', required => 1, |
90115979 |
28 | trigger => sub { |
29 | my $self = $_[0]; |
30 | $_[1]->autoflush(1); |
31 | Dlog_trace { my $id = $self->_id; "connection had send_to_fh set to $_" } $_[1]; |
32 | }, |
9e72f0cf |
33 | ); |
34 | |
12fb4a80 |
35 | has read_channel => ( |
9e72f0cf |
36 | is => 'ro', required => 1, |
37 | trigger => sub { |
12fb4a80 |
38 | my ($self, $ch) = @_; |
f8080c1c |
39 | my $id = $self->_id; |
40 | Dlog_trace { "trigger for read_channel has been invoked for connection $id; file handle is $_" } $ch->fh; |
9e72f0cf |
41 | weaken($self); |
12fb4a80 |
42 | $ch->on_line_call(sub { $self->_receive(@_) }); |
f8080c1c |
43 | $ch->on_close_call(sub { |
44 | log_trace { "invoking 'done' on on_close handler for connection id '$id'" }; |
45 | $self->on_close->done(@_); |
46 | }); |
9e72f0cf |
47 | }, |
48 | ); |
49 | |
f8080c1c |
50 | #TODO properly fix this bug - |
51 | #trigger can't ever be invoked with a default |
52 | #value and the on_close attribute is read only.... |
53 | #the future never gets the on_done handler |
54 | #installed |
55 | sub BUILD { |
56 | my ($self) = @_; |
57 | $self->on_close(CPS::Future->new); |
58 | } |
59 | |
12fb4a80 |
60 | has on_close => ( |
f8080c1c |
61 | is => 'rw', default => sub { CPS::Future->new }, |
9031635d |
62 | trigger => sub { |
12fb4a80 |
63 | my ($self, $f) = @_; |
9031635d |
64 | Dlog_trace { "trigger for on_close has been invoked for connection $_" } $self->_id; |
12fb4a80 |
65 | weaken($self); |
66 | $f->on_done(sub { |
f8080c1c |
67 | Dlog_trace { "failing all of the outstanding futures for connection $_" } $self->_id; |
68 | $self->_fail_outstanding("Connection lost: " . ($f->get)[0]); |
12fb4a80 |
69 | }); |
70 | } |
71 | ); |
ad4f54b2 |
72 | |
47c83a13 |
73 | has child_pid => (is => 'ro'); |
74 | |
11dbd4a0 |
75 | has local_objects_by_id => ( |
76 | is => 'ro', default => sub { {} }, |
77 | coerce => sub { +{ %{$_[0]} } }, # shallow clone on the way in |
78 | ); |
9e72f0cf |
79 | |
11dbd4a0 |
80 | has remote_objects_by_id => ( |
81 | is => 'ro', default => sub { {} }, |
82 | coerce => sub { +{ %{$_[0]} } }, # shallow clone on the way in |
83 | ); |
9e72f0cf |
84 | |
a980b0b8 |
85 | has outstanding_futures => (is => 'ro', default => sub { {} }); |
86 | |
12fb4a80 |
87 | sub _fail_outstanding { |
88 | my ($self, $error) = @_; |
9031635d |
89 | Dlog_debug { "Failing outstanding futures with '$error' for connection $_" } $self->_id; |
12fb4a80 |
90 | my $outstanding = $self->outstanding_futures; |
91 | $_->fail($error) for values %$outstanding; |
92 | %$outstanding = (); |
93 | return; |
94 | } |
95 | |
9e72f0cf |
96 | has _json => ( |
97 | is => 'lazy', |
98 | handles => { |
99 | _deserialize => 'decode', |
100 | _encode => 'encode', |
101 | }, |
102 | ); |
103 | |
fe6c9a7f |
104 | sub _id_to_remote_object { |
105 | my ($self, $id) = @_; |
9031635d |
106 | Dlog_trace { "fetching proxy for remote object with id '$id' for connection $_" } $self->_id; |
fe6c9a7f |
107 | return bless({}, 'Object::Remote::Null') if $id eq 'NULL'; |
108 | ( |
109 | $self->remote_objects_by_id->{$id} |
110 | or Object::Remote::Handle->new(connection => $self, id => $id) |
111 | )->proxy; |
112 | } |
113 | |
9e72f0cf |
114 | sub _build__json { |
115 | weaken(my $self = shift); |
9e72f0cf |
116 | JSON::PP->new->filter_json_single_key_object( |
117 | __remote_object__ => sub { |
fe6c9a7f |
118 | $self->_id_to_remote_object(@_); |
119 | } |
120 | )->filter_json_single_key_object( |
121 | __remote_code__ => sub { |
122 | my $code_container = $self->_id_to_remote_object(@_); |
123 | sub { $code_container->call(@_) }; |
9e72f0cf |
124 | } |
6ed5d580 |
125 | )->filter_json_single_key_object( |
126 | __scalar_ref__ => sub { |
127 | my $value = shift; |
128 | return \$value; |
129 | } |
ed5a8a8e |
130 | )->filter_json_single_key_object( |
131 | __glob_ref__ => sub { |
132 | my $glob_container = $self->_id_to_remote_object(@_); |
133 | my $handle = Symbol::gensym; |
134 | tie *$handle, 'Object::Remote::GlobProxy', $glob_container; |
135 | return $handle; |
136 | } |
6163a5aa |
137 | )->filter_json_single_key_object( |
138 | __local_object__ => sub { |
139 | $self->local_objects_by_id->{$_[0]} |
140 | } |
7790ca36 |
141 | )->filter_json_single_key_object( |
142 | __remote_tied_hash__ => sub { |
143 | my %tied_hash; |
144 | tie %tied_hash, 'Object::Remote::Tied', $self->_id_to_remote_object(@_); |
145 | return \%tied_hash; |
146 | } |
147 | )->filter_json_single_key_object( |
148 | __remote_tied_array__ => sub { |
149 | my @tied_array; |
150 | tie @tied_array, 'Object::Remote::Tied', $self->_id_to_remote_object(@_); |
151 | return \@tied_array; |
152 | } |
153 | ); |
9e72f0cf |
154 | } |
155 | |
84b04178 |
156 | BEGIN { |
157 | unshift our @Guess, sub { blessed($_[0]) ? $_[0] : undef }; |
158 | eval { require Object::Remote::Connector::Local }; |
a9fdb55e |
159 | eval { require Object::Remote::Connector::LocalSudo }; |
84b04178 |
160 | eval { require Object::Remote::Connector::SSH }; |
1d26d6f9 |
161 | eval { require Object::Remote::Connector::UNIX }; |
84b04178 |
162 | } |
163 | |
164 | sub new_from_spec { |
165 | my ($class, $spec) = @_; |
e144d525 |
166 | return $spec if blessed $spec; |
9031635d |
167 | Dlog_debug { "creating a new connection from spec" }; |
84b04178 |
168 | foreach my $poss (do { our @Guess }) { |
fbd3b8ec |
169 | if (my $conn = $poss->($spec)) { |
170 | return $conn->maybe::start::connect; |
171 | } |
84b04178 |
172 | } |
173 | die "Couldn't figure out what to do with ${spec}"; |
174 | } |
175 | |
11dbd4a0 |
176 | sub remote_object { |
e144d525 |
177 | my ($self, @args) = @_; |
178 | Object::Remote::Handle->new( |
179 | connection => $self, @args |
180 | )->proxy; |
181 | } |
182 | |
4c17fea5 |
183 | sub connect { |
184 | my ($self, $to) = @_; |
9031635d |
185 | Dlog_debug { "Creating connection to remote node '$to' for connection $_" } $self->_id; |
deb77aaf |
186 | return await_future( |
187 | $self->send_class_call(0, 'Object::Remote', connect => $to) |
188 | ); |
4c17fea5 |
189 | } |
190 | |
11dbd4a0 |
191 | sub remote_sub { |
c6fe6fbd |
192 | my ($self, $sub) = @_; |
193 | my ($pkg, $name) = $sub =~ m/^(.*)::([^:]+)$/; |
9031635d |
194 | Dlog_debug { "Invoking remote sub '$sub' for connection $_" } $self->_id; |
deb77aaf |
195 | return await_future($self->send_class_call(0, $pkg, can => $name)); |
196 | } |
197 | |
198 | sub send_class_call { |
199 | my ($self, $ctx, @call) = @_; |
9031635d |
200 | Dlog_trace { "Sending a class call for connection $_" } $self->_id; |
deb77aaf |
201 | $self->send(call => class_call_handler => $ctx => call => @call); |
202 | } |
203 | |
204 | sub register_class_call_handler { |
205 | my ($self) = @_; |
3687a42d |
206 | $self->local_objects_by_id->{'class_call_handler'} ||= do { |
c5736e1c |
207 | my $o = $self->new_class_call_handler; |
3687a42d |
208 | $self->_local_object_to_id($o); |
209 | $o; |
210 | }; |
c6fe6fbd |
211 | } |
212 | |
c5736e1c |
213 | sub new_class_call_handler { |
214 | Object::Remote::CodeContainer->new( |
215 | code => sub { |
216 | my ($class, $method) = (shift, shift); |
217 | use_module($class)->$method(@_); |
218 | } |
219 | ); |
220 | } |
221 | |
9e72f0cf |
222 | sub register_remote { |
223 | my ($self, $remote) = @_; |
9031635d |
224 | Dlog_trace { my $i = $remote->id; "Registered a remote object with id of '$i' for connection $_" } $self->_id; |
9e72f0cf |
225 | weaken($self->remote_objects_by_id->{$remote->id} = $remote); |
226 | return $remote; |
227 | } |
228 | |
229 | sub send_free { |
230 | my ($self, $id) = @_; |
7790ca36 |
231 | Dlog_trace { "sending request to free object '$id' for connection $_" } $self->_id; |
9e72f0cf |
232 | delete $self->remote_objects_by_id->{$id}; |
233 | $self->_send([ free => $id ]); |
234 | } |
235 | |
236 | sub send { |
237 | my ($self, $type, @call) = @_; |
238 | |
deb77aaf |
239 | my $future = CPS::Future->new; |
a2d43709 |
240 | my $remote = $self->remote_objects_by_id->{$call[0]}; |
deb77aaf |
241 | |
242 | unshift @call, $type => $self->_local_object_to_id($future); |
9e72f0cf |
243 | |
a980b0b8 |
244 | my $outstanding = $self->outstanding_futures; |
245 | $outstanding->{$future} = $future; |
a2d43709 |
246 | $future->on_ready(sub { |
247 | undef($remote); |
248 | delete $outstanding->{$future} |
249 | }); |
a980b0b8 |
250 | |
9e72f0cf |
251 | $self->_send(\@call); |
252 | |
253 | return $future; |
254 | } |
255 | |
9d804009 |
256 | sub send_discard { |
257 | my ($self, $type, @call) = @_; |
258 | |
deb77aaf |
259 | unshift @call, $type => 'NULL'; |
9d804009 |
260 | |
261 | $self->_send(\@call); |
262 | } |
263 | |
9e72f0cf |
264 | sub _send { |
265 | my ($self, $to_send) = @_; |
9d64d2d9 |
266 | my $fh = $self->send_to_fh; |
9031635d |
267 | Dlog_trace { "Starting to serialize data in argument to _send for connection $_" } $self->_id; |
9d64d2d9 |
268 | my $serialized = $self->_serialize($to_send)."\n"; |
6b7b2732 |
269 | Dlog_trace { my $l = length($serialized); "serialization is completed; sending '$l' characters of serialized data to $_" } $fh; |
9d64d2d9 |
270 | #TODO this is very risky for deadlocks unless it's set to non-blocking and then with out extra |
7790ca36 |
271 | #logic it could easily do short-writes to the remote side - how about taking this entire buffer |
272 | #and having the run loop send it to the file handle so this doesn't block while the sending |
273 | #is happening? |
f8080c1c |
274 | my $ret; |
275 | eval { |
276 | local($SIG{PIPE}) = 'IGNORE'; |
277 | die "filehandle is not open" unless openhandle($fh); |
278 | log_trace { "file handle has passed openhandle() test; printing to it" }; |
279 | $ret = print $fh $serialized; |
280 | die "print was not successful: $!" unless defined $ret |
281 | }; |
282 | |
283 | if ($@) { |
284 | Dlog_debug { "exception encountered when trying to write to file handle $_: $@" } $fh; |
285 | my $error = $@; chomp($error); |
286 | $self->on_close->done("could not write to file handle: $error") unless $self->on_close->is_ready; |
287 | return; |
288 | } |
289 | |
9d64d2d9 |
290 | return $ret; |
9e72f0cf |
291 | } |
292 | |
293 | sub _serialize { |
294 | my ($self, $data) = @_; |
3687a42d |
295 | local our @New_Ids = (-1); |
9d804009 |
296 | return eval { |
ad4f54b2 |
297 | my $flat = $self->_encode($self->_deobjectify($data)); |
298 | warn "$$ >>> ${flat}\n" if $DEBUG; |
299 | $flat; |
70a578ac |
300 | } || do { |
9d804009 |
301 | my $err = $@; # won't get here if the eval doesn't die |
302 | # don't keep refs to new things |
303 | delete @{$self->local_objects_by_id}{@New_Ids}; |
304 | die "Error serializing: $err"; |
305 | }; |
9e72f0cf |
306 | } |
307 | |
a76f2f60 |
308 | sub _local_object_to_id { |
309 | my ($self, $object) = @_; |
310 | my $id = refaddr($object); |
311 | $self->local_objects_by_id->{$id} ||= do { |
3687a42d |
312 | push our(@New_Ids), $id if @New_Ids; |
a76f2f60 |
313 | $object; |
314 | }; |
315 | return $id; |
316 | } |
317 | |
9e72f0cf |
318 | sub _deobjectify { |
319 | my ($self, $data) = @_; |
320 | if (blessed($data)) { |
6163a5aa |
321 | if ( |
322 | $data->isa('Object::Remote::Proxy') |
323 | and $data->{remote}->connection == $self |
324 | ) { |
325 | return +{ __local_object__ => $data->{remote}->id }; |
326 | } else { |
327 | return +{ __remote_object__ => $self->_local_object_to_id($data) }; |
328 | } |
9e72f0cf |
329 | } elsif (my $ref = ref($data)) { |
330 | if ($ref eq 'HASH') { |
7790ca36 |
331 | my $tied_to = tied(%$data); |
332 | if(defined($tied_to)) { |
333 | return +{__remote_tied_hash__ => $self->_local_object_to_id($tied_to)}; |
334 | } else { |
335 | return +{ map +($_ => $self->_deobjectify($data->{$_})), keys %$data }; |
336 | } |
9e72f0cf |
337 | } elsif ($ref eq 'ARRAY') { |
7790ca36 |
338 | my $tied_to = tied(@$data); |
339 | if (defined($tied_to)) { |
340 | return +{__remote_tied_array__ => $self->_local_object_to_id($tied_to)}; |
341 | } else { |
342 | return [ map $self->_deobjectify($_), @$data ]; |
343 | } |
fe6c9a7f |
344 | } elsif ($ref eq 'CODE') { |
345 | my $id = $self->_local_object_to_id( |
346 | Object::Remote::CodeContainer->new(code => $data) |
347 | ); |
348 | return +{ __remote_code__ => $id }; |
6ed5d580 |
349 | } elsif ($ref eq 'SCALAR') { |
350 | return +{ __scalar_ref__ => $$data }; |
ed5a8a8e |
351 | } elsif ($ref eq 'GLOB') { |
352 | return +{ __glob_ref__ => $self->_local_object_to_id( |
353 | Object::Remote::GlobContainer->new(handle => $data) |
354 | ) }; |
9e72f0cf |
355 | } else { |
356 | die "Can't collapse reftype $ref"; |
357 | } |
358 | } |
359 | return $data; # plain scalar |
360 | } |
361 | |
9e72f0cf |
362 | sub _receive { |
ad4f54b2 |
363 | my ($self, $flat) = @_; |
364 | warn "$$ <<< $flat\n" if $DEBUG; |
9031635d |
365 | Dlog_trace { my $l = length($flat); "Starting to deserialize $l characters of data for connection $_" } $self->_id; |
ad4f54b2 |
366 | my ($type, @rest) = eval { @{$self->_deserialize($flat)} } |
367 | or do { warn "Deserialize failed for ${flat}: $@"; return }; |
9031635d |
368 | Dlog_trace { "deserialization complete for connection $_" } $self->_id; |
9e72f0cf |
369 | eval { $self->${\"receive_${type}"}(@rest); 1 } |
ad4f54b2 |
370 | or do { warn "Receive failed for ${flat}: $@"; return }; |
9e72f0cf |
371 | return; |
372 | } |
373 | |
374 | sub receive_free { |
375 | my ($self, $id) = @_; |
9031635d |
376 | Dlog_trace { "got a receive_free for object '$id' for connection $_" } $self->_id; |
9d804009 |
377 | delete $self->local_objects_by_id->{$id} |
378 | or warn "Free: no such object $id"; |
9e72f0cf |
379 | return; |
380 | } |
381 | |
382 | sub receive_call { |
deb77aaf |
383 | my ($self, $future_id, $id, @rest) = @_; |
9031635d |
384 | Dlog_trace { "got a receive_call for object '$id' for connection $_" } $self->_id; |
deb77aaf |
385 | my $future = $self->_id_to_remote_object($future_id); |
8131a88a |
386 | $future->{method} = 'call_discard_free'; |
9e72f0cf |
387 | my $local = $self->local_objects_by_id->{$id} |
388 | or do { $future->fail("No such object $id"); return }; |
389 | $self->_invoke($future, $local, @rest); |
390 | } |
391 | |
8131a88a |
392 | sub receive_call_free { |
393 | my ($self, $future, $id, @rest) = @_; |
9031635d |
394 | Dlog_trace { "got a receive_call_free for object '$id' for connection $_" } $self->_id; |
84b04178 |
395 | $self->receive_call($future, $id, undef, @rest); |
8131a88a |
396 | $self->receive_free($id); |
397 | } |
398 | |
9e72f0cf |
399 | sub _invoke { |
84b04178 |
400 | my ($self, $future, $local, $ctx, $method, @args) = @_; |
9031635d |
401 | Dlog_trace { "got _invoke for a method named '$method' for connection $_" } $self->_id; |
dc28afe8 |
402 | if ($method =~ /^start::/) { |
403 | my $f = $local->$method(@args); |
404 | $f->on_done(sub { undef($f); $future->done(@_) }); |
3f1f1e66 |
405 | return unless $f; |
dc28afe8 |
406 | $f->on_fail(sub { undef($f); $future->fail(@_) }); |
407 | return; |
408 | } |
84b04178 |
409 | my $do = sub { $local->$method(@args) }; |
410 | eval { |
411 | $future->done( |
412 | defined($ctx) |
413 | ? ($ctx ? $do->() : scalar($do->())) |
414 | : do { $do->(); () } |
415 | ); |
416 | 1; |
417 | } or do { $future->fail($@); return; }; |
9e72f0cf |
418 | return; |
419 | } |
420 | |
9e72f0cf |
421 | 1; |
b9a9982d |
422 | |
423 | =head1 NAME |
424 | |
425 | Object::Remote::Connection - An underlying connection for L<Object::Remote> |
426 | |
427 | =head1 LAME |
428 | |
429 | Shipping prioritised over writing this part up. Blame mst. |
430 | |
431 | =cut |