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1 | package Catalyst::Engine::HTTP::Restarter::Watcher; |
2 | |
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3 | use Moose; |
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4 | use File::Find; |
5 | use File::Modified; |
6 | use File::Spec; |
7 | use Time::HiRes qw/sleep/; |
8 | |
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9 | has delay => (is => 'rw'); |
10 | has regex => (is => 'rw'); |
11 | has modified => (is => 'rw'); |
12 | has directory => (is => 'rw'); |
13 | has watch_list => (is => 'rw'); |
14 | has follow_simlinks => (is => 'rw'); |
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15 | |
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16 | no Moose; |
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17 | |
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18 | sub BUILD { |
19 | shift->_init; |
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20 | } |
21 | |
22 | sub _init { |
23 | my $self = shift; |
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24 | |
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25 | my $watch_list = $self->_index_directory; |
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26 | $self->watch_list($watch_list); |
27 | |
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28 | $self->modified( |
29 | File::Modified->new( |
30 | method => 'mtime', |
31 | files => [ keys %{$watch_list} ], |
32 | ) |
33 | ); |
34 | } |
35 | |
36 | sub watch { |
37 | my $self = shift; |
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38 | |
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39 | my @changes; |
40 | my @changed_files; |
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41 | |
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42 | my $delay = ( defined $self->delay ) ? $self->delay : 1; |
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43 | |
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44 | sleep $delay if $delay > 0; |
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45 | |
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46 | eval { @changes = $self->modified->changed }; |
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47 | if ($@) { |
48 | |
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49 | # File::Modified will die if a file is deleted. |
50 | my ($deleted_file) = $@ =~ /stat '(.+)'/; |
51 | push @changed_files, $deleted_file || 'unknown file'; |
52 | } |
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53 | |
54 | if (@changes) { |
55 | |
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56 | # update all mtime information |
57 | $self->modified->update; |
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58 | |
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59 | # check if any files were changed |
60 | @changed_files = grep { -f $_ } @changes; |
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61 | |
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62 | # Check if only directories were changed. This means |
63 | # a new file was created. |
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64 | unless (@changed_files) { |
65 | |
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66 | # re-index to find new files |
67 | my $new_watch = $self->_index_directory; |
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68 | |
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69 | # look through the new list for new files |
70 | my $old_watch = $self->watch_list; |
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71 | @changed_files = grep { !defined $old_watch->{$_} } |
72 | keys %{$new_watch}; |
73 | |
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74 | return unless @changed_files; |
75 | } |
76 | |
77 | # Test modified pm's |
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78 | for my $file (@changed_files) { |
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79 | next unless $file =~ /\.pm$/; |
80 | if ( my $error = $self->_test($file) ) { |
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81 | print STDERR qq/File "$file" modified, not restarting\n\n/; |
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82 | print STDERR '*' x 80, "\n"; |
83 | print STDERR $error; |
84 | print STDERR '*' x 80, "\n"; |
85 | return; |
86 | } |
87 | } |
88 | } |
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89 | |
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90 | return @changed_files; |
91 | } |
92 | |
93 | sub _index_directory { |
94 | my $self = shift; |
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95 | |
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96 | my $dir = $self->directory; |
97 | die "No directory specified" if !$dir or ref($dir) && !@{$dir}; |
98 | |
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99 | my $regex = $self->regex || '\.pm$'; |
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100 | my %list; |
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101 | |
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102 | finddepth( |
103 | { |
104 | wanted => sub { |
105 | my $file = File::Spec->rel2abs($File::Find::name); |
106 | return unless $file =~ /$regex/; |
107 | return unless -f $file; |
108 | $file =~ s{/script/..}{}; |
109 | $list{$file} = 1; |
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110 | |
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111 | # also watch the directory for changes |
112 | my $cur_dir = File::Spec->rel2abs($File::Find::dir); |
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113 | $cur_dir =~ s{/script/..}{}; |
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114 | $list{$cur_dir} = 1; |
115 | }, |
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116 | follow_fast => $self->follow_symlinks ? 1 : 0, |
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117 | no_chdir => 1 |
118 | }, |
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119 | ref $dir eq 'ARRAY' ? @{$dir} : $dir |
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120 | ); |
121 | return \%list; |
122 | } |
123 | |
124 | sub _test { |
125 | my ( $self, $file ) = @_; |
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126 | |
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127 | delete $INC{$file}; |
128 | local $SIG{__WARN__} = sub { }; |
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129 | |
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130 | open my $olderr, '>&STDERR'; |
131 | open STDERR, '>', File::Spec->devnull; |
132 | eval "require '$file'"; |
133 | open STDERR, '>&', $olderr; |
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134 | |
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135 | return ($@) ? $@ : 0; |
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136 | } |
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137 | |
138 | 1; |
139 | __END__ |
140 | |
141 | =head1 NAME |
142 | |
143 | Catalyst::Engine::HTTP::Restarter::Watcher - Watch for changed application |
144 | files |
145 | |
146 | =head1 SYNOPSIS |
147 | |
148 | my $watcher = Catalyst::Engine::HTTP::Restarter::Watcher->new( |
149 | directory => '/path/to/MyApp', |
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150 | regex => '\.yml$|\.yaml$|\.conf|\.pm$', |
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151 | delay => 1, |
152 | ); |
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153 | |
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154 | while (1) { |
155 | my @changed_files = $watcher->watch(); |
156 | } |
157 | |
158 | =head1 DESCRIPTION |
159 | |
160 | This class monitors a directory of files for changes made to any file |
161 | matching a regular expression. It correctly handles new files added to the |
162 | application as well as files that are deleted. |
163 | |
164 | =head1 METHODS |
165 | |
166 | =head2 new ( directory => $path [, regex => $regex, delay => $delay ] ) |
167 | |
168 | Creates a new Watcher object. |
169 | |
170 | =head2 watch |
171 | |
172 | Returns a list of files that have been added, deleted, or changed since the |
173 | last time watch was called. |
174 | |
175 | =head1 SEE ALSO |
176 | |
177 | L<Catalyst>, L<Catalyst::Engine::HTTP::Restarter>, L<File::Modified> |
178 | |
179 | =head1 AUTHORS |
180 | |
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181 | Catalyst Contributors, see Catalyst.pm |
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182 | |
183 | =head1 THANKS |
184 | |
185 | Many parts are ripped out of C<HTTP::Server::Simple> by Jesse Vincent. |
186 | |
187 | =head1 COPYRIGHT |
188 | |
189 | This program is free software, you can redistribute it and/or modify it under |
190 | the same terms as Perl itself. |
191 | |
192 | =cut |