NAME

Dancer2::Plugin::Tail - Tail a file from Dancer2

VERSION

Version 0.017

SYNOPSIS

  use Dancer2;
  use Dancer2::Plugin::Tail;

DESCRIPTION

This plugin will allow you to tail a file from within Dancer2. It's designed to be unobtrusive. So, it is functional just by calling it from your scripts. Edit entries in the Dancer configuration to setup routes and activate files that may be tailed. Additionally, you may define or restrict definition of tailed files.

CONFIGURATION

You may specify the route to files. The plugin will only read files so Dancer2 must have read access to them. The following configuration will generate two routes: '/tail/display' and '/tail/read'.

A sample HTML page with Bootstrap and jQuery is included in the samples directory. Use it as an example to build your own page.

  plugins:
    Tail:
      update_interval: 3000
      stop_on_empty_cnt: 5
      tmpdir:          '/tmp'
      display:
        method:    'get'
        url:       '/tail/display'
        template:  'tail.tt'
        layout:    'nomenu.tt'
      data:
        method:    'get'
        url:       '/tail/read'
      files:
        id1:    
          heading: 'Server Access Log'
          file:    '/var/logs/access_log'
        id2:    
          heading: 'Server Error Log'
          file:    '/var/logs/error_log'
update_interval

Specify an update interval. Default is 3 seconds (3000). This value is passed to your web page or window. See example that's included.

stop_on_empty_cnt

Specify the number of empty responses before stopping. Default is 10. This value is passed to your web page or window. See example that's included.

tmpdir

location of user generted files to tail. Default is '/tmp'.

display

Defines display settings.

method

Default 'get'.

url

Route in Dancer2 to display template for tailing. Default = '/tail/display'

template

Template of tail screen. Default = 'tail.tt'

layout

Layout of template. This is useful when opening a window to tail files.

data

Defines file tail settings.

method

Default 'get'.

url

Route in Dancer2 to tail files. Default = '/tail/read'

files

List of predefined files that can be tailed.

ID

Define a unique ID for this file

heading

This is a heading or title of the html page to be passed to the template. Use it as a short description to the file you're taiing.

file

Full path and file name to tail.

Note that you must have a session provider configured to dynamically tail files using this plugin. This plugin requires sessions in order to track information about user defined tailed files for the logged in user. Please see Dancer2::Core::Session for information on how to configure session management within your application.

display_tail

This function displays the specified template with the data from the configuration file.

define_file_to_tail

A function called to dynamically define a file to tail. This is useful for launching long running applications and having their out put tailed. In general, this will generate a 32 character string that you should use to direct the output of your process. Then, Dancer2::Plugin::Tail will tail the content of this file.

_tail_the_file

This private function does the actual job of tailing the file.

_new_file_id

An internal functio that returns a 32 character string when called from define_file_to_tail.

AUTHOR

Hagop "Jack" Bilemjian, <jck000 at gmail.com>

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Dancer2::Plugin::Tail

You can also look for information at:

LICENSE AND COPYRIGHT

Copyright 2016-2017 Hagop "Jack" Bilemjian.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

SEE ALSO

Dancer2

Dancer2::Plugin