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code |
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package Plack::Handler::Stomp::NoNetwork; |
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$Plack::Handler::Stomp::NoNetwork::VERSION = '1.14'; |
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{ |
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$Plack::Handler::Stomp::NoNetwork::DIST = 'Plack-Handler-Stomp'; |
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} |
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12540
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use Moose; |
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use namespace::autoclean; |
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use Try::Tiny; |
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use File::ChangeNotify; |
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use Net::Stomp::MooseHelpers::ReadTrace 1.7; |
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use Path::Class; |
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1324
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extends 'Plack::Handler::Stomp'; |
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# ABSTRACT: like L<Plack::Handler::Stomp>, but without a network |
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with 'Net::Stomp::MooseHelpers::TraceOnly'; |
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sub _default_servers { |
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[ { |
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1
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hostname => 'not.using.the.network', |
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port => 9999, |
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} ] |
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} |
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has subscription_directory_map => ( |
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is => 'ro', |
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isa => 'HashRef', |
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default => sub { { } }, |
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); |
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after subscribe_single => sub { |
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my ($self,$sub,$headers) = @_; |
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my $dest_dir = $self->trace_basedir->subdir( |
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$self->_dirname_from_destination( |
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$headers->{destination} |
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) |
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); |
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$dest_dir->mkpath; |
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my $id = $headers->{id}; |
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$self->subscription_directory_map->{$dest_dir->stringify}=$id; |
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46
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return; |
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}; |
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49
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50
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has file_watcher => ( |
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is => 'ro', |
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isa => 'File::ChangeNotify::Watcher', |
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lazy_build => 1, |
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); |
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sub _build_file_watcher { |
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1
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1
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3
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my ($self) = @_; |
57
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58
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1
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2
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my @directories = keys %{$self->subscription_directory_map}; |
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29
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59
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60
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# File::ChangeNotify::Watcher::Default throws an exception if you |
61
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# ask it to monitor non-existent directories; coupled with the |
62
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# try/catch below, it would lead to an infinite loop. Let's make |
63
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# sure it does not happen |
64
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1
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12
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dir($_)->mkpath for @directories; |
65
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66
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1
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561
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return File::ChangeNotify->instantiate_watcher( |
67
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directories => \@directories, |
68
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filter => qr{^\d+\.\d+-send-}, |
69
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); |
70
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} |
71
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72
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73
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has frame_reader => ( |
74
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is => 'ro', |
75
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lazy_build => 1, |
76
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); |
77
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sub _build_frame_reader { |
78
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1
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1
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3
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my ($self) = @_; |
79
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80
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1
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31
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return Net::Stomp::MooseHelpers::ReadTrace->new({ |
81
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trace_basedir => $self->trace_basedir, |
82
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}); |
83
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} |
84
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85
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86
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sub frame_loop { |
87
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1
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1
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1
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3
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my ($self,$app) = @_; |
88
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89
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1
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2
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while (1) { |
90
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6
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15
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my @events; |
91
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# if someone deletes multiple directories while we're looking |
92
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# at them, File::ChangeNotify::Watcher::Default gets very |
93
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# confused and throws an exception. Let's catch it and just |
94
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# re-build the watcher. |
95
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6
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6
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487
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try { @events = $self->file_watcher->wait_for_events() } |
96
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catch { |
97
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0
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0
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0
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0
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if (/File::ChangeNotify::Watcher::Default::/) { |
98
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0
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0
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$self->clear_file_watcher; |
99
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} |
100
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0
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0
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else { die $_ } |
101
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6
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66
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}; |
102
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5
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10011423
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for my $event (@events) { |
103
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5
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50
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38
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next unless $event->type eq 'create'; |
104
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5
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50
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73
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next unless -f $event->path; |
105
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# loop until the reader can get a complete frame, to work |
106
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# around race conditions between the writer and us |
107
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5
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10
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my $frame; |
108
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5
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25
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while (!$frame) { |
109
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5
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199
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$frame = $self->frame_reader |
110
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->read_frame_from_filename($event->path); |
111
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} |
112
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113
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# messages sent will be of type "SEND", but they would |
114
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# come back ask "MESSAGE" if they passed through a broker |
115
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5
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50
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2664
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$frame->command('MESSAGE') if $frame->command eq 'SEND'; |
116
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117
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$frame->headers->{subscription} = |
118
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$self->subscription_directory_map->{ |
119
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5
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307
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file($event->path)->dir->stringify |
120
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}; |
121
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122
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5
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669
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$self->handle_stomp_frame($app, $frame); |
123
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124
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5
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50
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395
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Plack::Handler::Stomp::Exceptions::OneShot->throw() |
125
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if $self->one_shot; |
126
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} |
127
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} |
128
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} |
129
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130
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__PACKAGE__->meta->make_immutable; |
131
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132
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1; |
133
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134
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__END__ |
135
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136
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=pod |
137
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138
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=encoding UTF-8 |
139
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140
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=head1 NAME |
141
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142
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Plack::Handler::Stomp::NoNetwork - like L<Plack::Handler::Stomp>, but without a network |
143
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144
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=head1 VERSION |
145
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146
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version 1.14 |
147
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148
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=head1 SYNOPSIS |
149
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150
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my $runner = Plack::Handler::Stomp::NoNetwork->new({ |
151
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trace_basedir => '/tmp/mq', |
152
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subscriptions => [ |
153
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{ destination => '/queue/plack-handler-stomp-test' }, |
154
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{ destination => '/topic/plack-handler-stomp-test', |
155
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path_info => '/topic/ch1', }, |
156
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{ destination => '/topic/plack-handler-stomp-test', |
157
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path_info => '/topic/ch2', }, |
158
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], |
159
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}); |
160
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$runner->run(MyApp->get_app()); |
161
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162
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=head1 DESCRIPTION |
163
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164
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Just like L<Plack::Handler::Stomp>, but instead of using a network |
165
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connection, we get our frames from a directory. |
166
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167
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This class uses L<File::ChangeNotify> to monitor the |
168
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L<trace_basedir|Net::Stomp::MooseHelpers::TraceOnly/trace_basedir>, |
169
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and L<Net::Stomp::MooseHelpers::ReadTrace> to read the frames. |
170
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171
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It also consumes L<Net::Stomp::MooseHelpers::TraceOnly> to make sure |
172
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that every reply we try to send is actually written to disk instead of |
173
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a broker. |
174
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175
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=head2 WARNING! |
176
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177
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This class does not implement subscription selectors. If you have |
178
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multiple subscriptions for the same destination, a random one will be |
179
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used. |
180
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181
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|
=head1 ATTRIBUTES |
182
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183
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=head2 C<file_watcher> |
184
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185
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Instance of L<File::ChangeNotify::Watcher>, set up to monitor |
186
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C<trace_basedir> for sent messages. |
187
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188
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=head2 C<frame_reader> |
189
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190
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Instance of L<Net::Stomp::MooseHelpers::ReadTrace> used to parse |
191
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frames from disk. |
192
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193
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|
=head1 METHODS |
194
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195
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=head2 C<frame_loop> |
196
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197
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This method overrides the corresponding one from |
198
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L<Plack::Handler::Stomp>. |
199
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200
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Loop forever, collecting C<create> events from the |
201
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L</file_watcher>. Each new file is parsed by the L</frame_reader>, |
202
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then passed to |
203
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L<handle_stomp_frame|Plack::Handler::Stomp/handle_stomp_frame> as |
204
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usual. |
205
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206
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=head1 AUTHOR |
207
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208
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Gianni Ceccarelli <gianni.ceccarelli@net-a-porter.com> |
209
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210
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=head1 COPYRIGHT AND LICENSE |
211
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212
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This software is copyright (c) 2012 by Net-a-porter.com. |
213
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214
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This is free software; you can redistribute it and/or modify it under |
215
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the same terms as the Perl 5 programming language system itself. |
216
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217
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=cut |