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package Plack::Middleware::AutoRefresh; |
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3
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209394
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use strict; |
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3
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133
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use warnings; |
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81
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1136
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use parent qw( Plack::Middleware ); |
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325
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13
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6
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our $VERSION = '0.08'; |
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163276
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use Plack::Util; |
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3
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79
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3
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use Plack::Util::Accessor qw( dirs filter wait ); |
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10
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6329
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use AnyEvent; |
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30952
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3
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317
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12
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13207
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use AnyEvent::Filesys::Notify; |
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810949
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3
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123
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3
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3244
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use JSON::Any; |
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28148
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3
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32
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14
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3
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3
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26112
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use File::Slurp; |
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53040
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3
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398
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15
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3
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3
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3111
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use File::ShareDir qw(dist_file); |
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3
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24651
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3
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254
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3
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3
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27
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use File::Basename; |
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6
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3
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237
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use Carp; |
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3
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173
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18
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3
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3
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2751
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use Readonly; |
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10703
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3
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3900
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20
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Readonly my $URL => '/_plackAutoRefresh'; |
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Readonly my $JS => 'js/plackAutoRefresh.min.js'; |
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Readonly my $JS_DEV => 'js/plackAutoRefresh.js'; |
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24
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sub prepare_app { |
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1
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1
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1
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70
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my $self = shift; |
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27
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# Setup config params: filter, wait, dirs |
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29
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1
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50
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0
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103
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$self->{filter} ||= sub { $_[0] !~ qr/\.(swp|bak)$/ }; |
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0
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30
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0
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0
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0
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$self->{filter} = sub { $_[0] !~ $self->filter } |
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1
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50
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7
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if ref( $self->filter ) eq 'Regexp'; |
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1
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50
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15
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croak "AutoRefresh: filter must be a regex or code ref" |
33
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unless ref( $self->filter ) eq 'CODE'; |
34
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35
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1
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50
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16
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$self->{wait} ||= 5; |
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37
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1
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50
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8
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$self->{dirs} ||= ['.']; |
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1
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33
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2
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-d $_ or carp "AutoRefresh: can't find directory $_" for @{ $self->dirs }; |
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1
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8
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39
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40
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# Create the filesystem watcher |
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$self->{watcher} = AnyEvent::Filesys::Notify->new( |
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dirs => $self->dirs, |
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interval => 0.5, |
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cb => sub { |
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0
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0
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0
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my @events = grep { $self->filter->( $_->path ) } @_; |
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0
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0
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46
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0
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0
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0
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return unless @events; |
47
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48
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0
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0
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warn "detected change: ", substr( $_->path, -60 ), "\n" for @events; |
49
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0
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0
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$self->_change_handler(@events); |
50
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}, |
51
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1
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26
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); |
52
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53
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# Setup an hash to hold the condition vars, record the load time as |
54
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# the last change to deal with restarts, and get the raw js script |
55
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1
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52794
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$self->{condvars} = {}; |
56
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1
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11
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$self->{last_change} = time; |
57
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1
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6
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$self->{_script} = $self->_get_script; |
58
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59
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1
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194
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return; |
60
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} |
61
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62
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sub call { |
63
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1
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1
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1
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33380
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my ( $self, $env ) = @_; |
64
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65
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1
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50
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291
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carp "AutoRefresh middleware doesn't work if psgi.nonblocking is false.\n", |
66
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"Servers that are known to work: AnyEvent and Coro\n" |
67
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unless $env->{'psgi.nonblocking'}; |
68
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69
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# Client is looking for changed files |
70
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1
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50
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308
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if ( $env->{PATH_INFO} =~ m{^/_plackAutoRefresh(?:/(\d+)/(\d+))?} ) { |
71
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0
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0
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my ( $uid, $timestamp ) = ( $1, $2 ); |
72
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73
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# If a change has already happened return immediately, |
74
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# otherwise make the browser block while we wait for change events |
75
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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 ( defined $timestamp && $timestamp < $self->{last_change} ) { |
76
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0
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0
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return $self->_respond( { changed => $self->{last_change} } ); |
77
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} else { |
78
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79
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# Unblock any connections with the same uid. |
80
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# This should close the tcp session to avoid using up |
81
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# all the tcp ports. RT#56119 |
82
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0
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0
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0
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if ( my $old_connection = $self->{condvars}->{$uid} ) { |
83
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# The connection has already been dropped by the |
84
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# client, so it doesn't matter what we return. |
85
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0
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0
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$old_connection->send( [ 500, [], [] ] ); |
86
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} |
87
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88
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# Add this connection to the list |
89
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0
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0
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my $cv = AE::cv; |
90
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0
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0
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$self->{condvars}->{$uid} = $cv; |
91
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92
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# Finish up |
93
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return sub { |
94
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0
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0
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0
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my $respond = shift; |
95
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0
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0
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$cv->cb( sub { $respond->( $_[0]->recv ) } ); |
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0
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0
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96
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0
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0
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}; |
97
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} |
98
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} |
99
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100
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# Client wants something from the real app. |
101
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# Insert our script if it is an html file |
102
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1
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15
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my $response = $self->app->($env); |
103
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return $self->response_cb( |
104
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$response, |
105
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sub { |
106
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1
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1
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27
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my $res = shift; |
107
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1
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7
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my $ct = Plack::Util::header_get( $res->[1], 'Content-Type' ); |
108
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109
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1
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50
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47
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if ( $ct =~ m!^(?:text/html|application/xhtml\+xml)! ) { |
110
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return sub { |
111
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2
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44
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my $chunk = shift; |
112
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2
|
100
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9
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return unless defined $chunk; |
113
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1
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9
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$chunk =~ s{}{'' . $self->_insert}ei; |
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1
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5
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114
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1
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6
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$chunk; |
115
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} |
116
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1
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8
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} |
117
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1
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34
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} ); |
118
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} |
119
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120
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# Return the js script updating the time and adding config params |
121
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sub _insert { |
122
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1
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1
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4
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my ($self) = @_; |
123
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124
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1
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6
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my %var = ( |
125
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wait => $self->wait * 1000, |
126
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url => $URL, |
127
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uid => $self->_uid, |
128
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now => time, |
129
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); |
130
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131
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1
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21
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( my $script = $self->{_script} ) =~ s/{{([^}]*)}}/$var{$1}/eg; |
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5
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37
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132
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1
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16
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return $script; |
133
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} |
134
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135
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sub _uid { |
136
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1
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1
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10
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my $self = shift; |
137
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1
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15
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return ++$self->{_uid}; |
138
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} |
139
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140
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# AFN saw a change, respond to each blocked client |
141
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sub _change_handler { |
142
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0
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0
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0
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my $self = shift; |
143
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144
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0
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0
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my $now = $self->{last_change} = time; |
145
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0
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0
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for my $uid ( keys %{ $self->{condvars} } ) { |
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0
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0
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146
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0
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0
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my $condvar = delete $self->{condvars}->{$uid}; |
147
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0
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0
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$condvar->send( $self->_respond( { changed => $now } ) ); |
148
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} |
149
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150
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0
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0
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return 1; |
151
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} |
152
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153
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# Generate the plack response and encode any arguments as json |
154
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sub _respond { |
155
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0
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0
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0
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my ( $self, $resp ) = @_; |
156
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## TODO: check that resp is a hash ref |
157
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158
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return [ |
159
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0
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0
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200, |
160
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[ 'Content-Type' => 'application/json' ], |
161
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[ JSON::Any->new->encode($resp) ] ]; |
162
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} |
163
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164
|
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# Return the js script from ShareDir unless we are developing/testing PMA. |
165
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|
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# This is a bit hack-ish |
166
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sub _get_script { |
167
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1
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1
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4
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my $self = shift; |
168
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169
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1
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|
93
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my $script = |
170
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|
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File::Spec->catfile( dirname( $INC{'Plack/Middleware/AutoRefresh.pm'} ), |
171
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|
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qw( .. .. .. share ), $JS_DEV ); |
172
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173
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1
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50
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|
60
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$script = dist_file( 'Plack-Middleware-AutoRefresh', $JS ) |
174
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|
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unless -r $script; |
175
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176
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1
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|
263
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return ''; |
177
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} |
178
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179
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1; |
180
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181
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__END__ |