Commit | Line | Data |
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1 | package Object::Remote::Connection; |
2 | |
3 | use CPS::Future; |
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4 | use Object::Remote::Null; |
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5 | use Object::Remote; |
6 | use IO::Handle; |
7 | use Module::Runtime qw(use_module); |
8 | use Scalar::Util qw(weaken blessed refaddr); |
9 | use JSON::PP qw(encode_json); |
10 | use Moo; |
11 | |
ad4f54b2 |
12 | our $DEBUG; |
13 | |
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14 | has send_to_fh => ( |
15 | is => 'ro', required => 1, |
16 | trigger => sub { $_[1]->autoflush(1) }, |
17 | ); |
18 | |
19 | has receive_from_fh => ( |
20 | is => 'ro', required => 1, |
21 | trigger => sub { |
22 | my ($self, $fh) = @_; |
23 | weaken($self); |
24 | Object::Remote->current_loop |
25 | ->watch_io( |
26 | handle => $fh, |
27 | on_read_ready => sub { $self->_receive_data_from($fh) } |
28 | ); |
29 | }, |
30 | ); |
31 | |
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32 | has on_close => (is => 'rw', default => sub {}); |
33 | |
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34 | has _receive_data_buffer => (is => 'ro', default => sub { my $x = ''; \$x }); |
35 | |
36 | has local_objects_by_id => (is => 'ro', default => sub { {} }); |
37 | |
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38 | has remote_objects_by_id => (is => 'ro', default => sub { {} }); |
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39 | |
40 | has _json => ( |
41 | is => 'lazy', |
42 | handles => { |
43 | _deserialize => 'decode', |
44 | _encode => 'encode', |
45 | }, |
46 | ); |
47 | |
48 | sub _build__json { |
49 | weaken(my $self = shift); |
50 | my $remotes = $self->remote_objects_by_id; |
51 | JSON::PP->new->filter_json_single_key_object( |
52 | __remote_object__ => sub { |
53 | my $id = shift; |
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54 | return bless({}, 'Object::Remote::Null') if $id eq 'NULL'; |
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55 | ( |
56 | $remotes->{$id} |
57 | or Object::Remote->new(connection => $self, id => $id) |
58 | )->proxy; |
59 | } |
60 | ); |
61 | } |
62 | |
63 | sub register_remote { |
64 | my ($self, $remote) = @_; |
65 | weaken($self->remote_objects_by_id->{$remote->id} = $remote); |
66 | return $remote; |
67 | } |
68 | |
69 | sub send_free { |
70 | my ($self, $id) = @_; |
71 | delete $self->remote_objects_by_id->{$id}; |
72 | $self->_send([ free => $id ]); |
73 | } |
74 | |
75 | sub send { |
76 | my ($self, $type, @call) = @_; |
77 | |
78 | unshift @call, $type => my $future = CPS::Future->new; |
79 | |
80 | $self->_send(\@call); |
81 | |
82 | return $future; |
83 | } |
84 | |
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85 | sub send_discard { |
86 | my ($self, $type, @call) = @_; |
87 | |
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88 | unshift @call, $type => { __remote_object__ => 'NULL' }; |
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89 | |
90 | $self->_send(\@call); |
91 | } |
92 | |
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93 | sub _send { |
94 | my ($self, $to_send) = @_; |
95 | |
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96 | print { $self->send_to_fh } $self->_serialize($to_send)."\n"; |
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97 | } |
98 | |
99 | sub _serialize { |
100 | my ($self, $data) = @_; |
101 | local our @New_Ids; |
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102 | return eval { |
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103 | my $flat = $self->_encode($self->_deobjectify($data)); |
104 | warn "$$ >>> ${flat}\n" if $DEBUG; |
105 | $flat; |
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106 | } or do { |
107 | my $err = $@; # won't get here if the eval doesn't die |
108 | # don't keep refs to new things |
109 | delete @{$self->local_objects_by_id}{@New_Ids}; |
110 | die "Error serializing: $err"; |
111 | }; |
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112 | } |
113 | |
114 | sub _deobjectify { |
115 | my ($self, $data) = @_; |
116 | if (blessed($data)) { |
117 | my $id = refaddr($data); |
118 | $self->local_objects_by_id->{$id} ||= do { |
119 | push our(@New_Ids), $id; |
120 | $data; |
121 | }; |
122 | return +{ __remote_object__ => $id }; |
123 | } elsif (my $ref = ref($data)) { |
124 | if ($ref eq 'HASH') { |
125 | return +{ map +($_ => $self->_deobjectify($data->{$_})), keys %$data }; |
126 | } elsif ($ref eq 'ARRAY') { |
127 | return [ map $self->_deobjectify($_), @$data ]; |
128 | } else { |
129 | die "Can't collapse reftype $ref"; |
130 | } |
131 | } |
132 | return $data; # plain scalar |
133 | } |
134 | |
135 | sub _receive_data_from { |
136 | my ($self, $fh) = @_; |
137 | my $rb = $self->_receive_data_buffer; |
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138 | if (sysread($fh, $$rb, 1024, length($$rb)) > 0) { |
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139 | while ($$rb =~ s/^(.*)\n//) { |
140 | $self->_receive($1); |
141 | } |
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142 | } else { |
143 | $self->on_close->(); |
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144 | } |
145 | } |
146 | |
147 | sub _receive { |
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148 | my ($self, $flat) = @_; |
149 | warn "$$ <<< $flat\n" if $DEBUG; |
150 | my ($type, @rest) = eval { @{$self->_deserialize($flat)} } |
151 | or do { warn "Deserialize failed for ${flat}: $@"; return }; |
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152 | eval { $self->${\"receive_${type}"}(@rest); 1 } |
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153 | or do { warn "Receive failed for ${flat}: $@"; return }; |
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154 | return; |
155 | } |
156 | |
157 | sub receive_free { |
158 | my ($self, $id) = @_; |
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159 | delete $self->local_objects_by_id->{$id} |
160 | or warn "Free: no such object $id"; |
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161 | return; |
162 | } |
163 | |
164 | sub receive_call { |
165 | my ($self, $future, $id, @rest) = @_; |
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166 | $future->{method} = 'call_discard'; |
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167 | my $local = $self->local_objects_by_id->{$id} |
168 | or do { $future->fail("No such object $id"); return }; |
169 | $self->_invoke($future, $local, @rest); |
170 | } |
171 | |
172 | sub receive_class_call { |
173 | my ($self, $future, $class, @rest) = @_; |
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174 | $future->{method} = 'call_discard'; |
9e72f0cf |
175 | eval { use_module($class) } |
176 | or do { $future->fail("Error loading ${class}: $@"); return }; |
177 | $self->_invoke($future, $class, @rest); |
178 | } |
179 | |
180 | sub _invoke { |
181 | my ($self, $future, $local, $method, @args) = @_; |
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182 | eval { $future->done(scalar $local->$method(@args)); 1 } |
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183 | or do { $future->fail($@); return; }; |
184 | return; |
185 | } |
186 | |
187 | sub DEMOLISH { |
188 | my ($self, $gd) = @_; |
189 | return if $gd; |
190 | Object::Remote->current_loop |
191 | ->unwatch_io( |
192 | handle => $self->receive_from_fh, |
193 | on_read_ready => 1 |
194 | ); |
195 | } |
196 | |
197 | 1; |