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package Dancer::Plugin::Tail; |
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use 5.006; |
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use strict; |
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use warnings FATAL => 'all'; |
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use Dancer ':syntax'; |
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use Dancer::Exception ':all'; |
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use Dancer::Plugin; |
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use Dancer::Session; |
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use String::Random; |
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my $STRRand = String::Random->new; |
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=head1 NAME |
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Dancer::Plugin::Tail - Tail a file from Dancer |
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=head1 VERSION |
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Version 0.0003 |
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=cut |
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our $VERSION = '0.0003'; |
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=head1 SYNOPSIS |
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use Dancer; |
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use Dancer::Plugin::Tail; |
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=head1 DESCRIPTION |
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This plugin will allow you to tail a file from within Dancer. It's designed to be unobtrusive. So, it is functional just by calling it from your scripts. Add or remove entries from the configuration file to activate or deactivate files that may be viewed. The plugin will dynamically generate a route in your application based on parameters from the configuration file. |
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=head1 CONFIGURATION |
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plugins: |
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tail: |
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interval: 3000 |
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tmpdir: '/tmp' |
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files: |
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id1: '/var/logs/access_log' |
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id2: '/var/logs/error_log' |
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You may specify the route and access to files. The plugin will only read files so it must have read access to them. The above configuration will generate '/showittome' as a route. |
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A sample HTML page is included in the samples directory. Use it as an example to build your own page. |
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=cut |
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# Generate a route based on configuration settings |
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my $conf = plugin_setting; |
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get '/tail/:id/:curr_pos' => sub { |
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my $id = params->{id}; # Id of file |
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my $curr_pos = params->{curr_pos} || 0; # Start reading from here |
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my $log_file = ''; |
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if ( defined $conf->{files}->{$id} ) { # is it predefined? |
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$log_file = $conf->{files}->{$id}; |
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} elsif ( session->{'tail_' . $id} ) { # is it a temp file? |
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$log_file = session->{'tail_' . $id}; |
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} else { |
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send_error('404'); |
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} |
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# Only do it if the file is defined |
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if ( $log_file ne '' ) { |
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debug "Tail file:$log_file"; |
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my ($output, $whence); |
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open(my $IN, '<', $log_file); # Open file for reading |
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# Add header if it's 1st request |
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if ( $curr_pos < 1 ) { |
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$output = "$log_file\n"; |
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} |
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# Determine where to start reading |
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if ( $curr_pos < 0 ) { |
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$whence = 2; # Relative to current position |
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} else { |
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$whence = 1; # Absolute current position |
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} |
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seek( $IN, $curr_pos, $whence ); # Seek the place where we were last |
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while ( my $line = <$IN> ) { # Continue until end |
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$output .= $line ; |
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} |
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my $file_end = tell($IN); # Figure out the end of the file |
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debug "File End: $file_end"; |
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close($IN); |
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106
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# Return JSON |
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to_json( { new_curr_pos => $file_end, |
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interval => $conf->{interval}, |
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output => $output } ); |
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} |
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}; |
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=head1 C |
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115
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=cut |
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117
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register temp_file_to_tail => sub { |
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0
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0
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my $file_id = $STRRand->randregex( '[A-Za-z]{16}' ) . time; |
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0
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my $log_file = $conf->{tmpdir} . '/' . $file_id ; |
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0
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session 'tail_' . $file_id => $log_file; |
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0
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return $file_id; |
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}; |
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register_plugin; |
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128
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=head1 AUTHOR |
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130
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Hagop "Jack" Bilemjian, C<< >> |
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132
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=head1 BUGS |
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Please report any bugs or feature requests to C, or through |
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the web interface at L. I will be notified, and then you'll |
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automatically be notified of progress on your bug as I make changes. |
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=head1 SUPPORT |
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143
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You can find documentation for this module with the perldoc command. |
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145
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perldoc Dancer::Plugin::Tail |
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147
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148
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You can also look for information at: |
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150
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=over 4 |
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152
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=item * RT: CPAN's request tracker (report bugs here) |
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L |
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156
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=item * AnnoCPAN: Annotated CPAN documentation |
157
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158
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L |
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160
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=item * CPAN Ratings |
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162
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L |
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164
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=item * Search CPAN |
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L |
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168
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=back |
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170
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171
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=head1 ACKNOWLEDGEMENTS |
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173
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174
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=head1 LICENSE AND COPYRIGHT |
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176
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Copyright 2015 Hagop "Jack" Bilemjian. |
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178
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This program is free software; you can redistribute it and/or modify it |
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under the terms of the the Artistic License (2.0). You may obtain a |
180
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copy of the full license at: |
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182
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L |
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184
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Any use, modification, and distribution of the Standard or Modified |
185
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Versions is governed by this Artistic License. By using, modifying or |
186
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distributing the Package, you accept this license. Do not use, modify, |
187
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or distribute the Package, if you do not accept this license. |
188
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189
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If your Modified Version has been derived from a Modified Version made |
190
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by someone other than you, you are nevertheless required to ensure that |
191
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your Modified Version complies with the requirements of this license. |
192
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193
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This license does not grant you the right to use any trademark, service |
194
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mark, tradename, or logo of the Copyright Holder. |
195
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196
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This license includes the non-exclusive, worldwide, free-of-charge |
197
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patent license to make, have made, use, offer to sell, sell, import and |
198
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otherwise transfer the Package with respect to any patent claims |
199
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licensable by the Copyright Holder that are necessarily infringed by the |
200
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Package. If you institute patent litigation (including a cross-claim or |
201
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counterclaim) against any party alleging that the Package constitutes |
202
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direct or contributory patent infringement, then this Artistic License |
203
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to you shall terminate on the date that such litigation is filed. |
204
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205
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Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER |
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AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. |
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THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR |
208
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PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY |
209
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YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR |
210
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CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR |
211
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CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, |
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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214
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215
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=head1 SEE ALSO |
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217
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L |
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219
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L |
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221
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=cut |
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223
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1; # End of Dancer::Plugin::Tail |
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225
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226
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