Nagios-inspired system tray events desktop watcher / notifier


Build status


Nagios-inspired system tray events desktop watcher / notifier. The main difference, that it is desktop application.

There is too many programs (system update, news, weather etc), which notify you about it via it's own style.

Do you need to track and aggregate events from the different sources? PerlWatcher can do simplified infrastructure monitoring (pinging them), track stock quotes, weather, new software updates, poll the remote VCS for RSS updates, be notified by local news or by some changes on your /var/log/messages? Do you want to have possibility to easily write your own event-watcher in the case you local media-content provider does not have any API no notify you about new films and you fill yourself hackish enough to do some reverse engineering for writing your watcher?

If yes, than PerlWatcher is designed for that purpose.

PerlWatcher supports also an different levels of notification: "notice", "info" .. "alert". They indicate how important the event is for you: if you are doing an boring task it's natural to switch attention to anything else for couple of seconds; but if the task is serious you can rise the notification level to 'alert' to be disturbed only by blackout on remote servers :)

It looks like (Gtk2 UI):

PerlWatcher GTK2 screenshot

PerlWatcher and RSS-Aggregator

PerlWatcher isn't designed to be fully functional RSS-Aggregator, because:

  • RSS-feeds news often aren't complete as web version, because web-masters need you to go to the site and see the banners. It isn't very pleasant to read only the half part of the news, and then go to the site to see the full version.
  • PerlWatcher is designed to be lightweight: displaying simple text (headers) is enough for that, while showing the HTML with images isn't so.


Install perl and cpan-minus . The most easy way to do that is just do

curl -L | perl - --sudo App::cpanminus

Now it is time to intall PerlWatcher itself

cpanm App::PerlWatcher::Engine
cpanm App::PerlWatcher::UI::Gtk2
cpanm App::PerlWatcher::Watcher::FileTail

Running (GTK2-frontend)


Edit ~/.perl-watcher/engine.conf and add/modify watchers like:

            class => 'App::PerlWatcher::Watcher::Ping',
            config => {
                host    =>  '',
                port    =>  80,
                frequency   =>  10,
                on => { fail => { 5 => 'alert' } },

            class => 'App::PerlWatcher::Watcher::Rss',
            config => {
                url         =>  '',
                title       =>  'opennet',
                frequency   => 60,
                timeout     => 10,
                items       =>  5,
                on          => {
                        ok      => { 1  => 'notice' },
                        fail    => { 10 => 'info/max' },

Explanation: here the PerlWatcher will

  • montitor by pinging it's port 80 every 10 seconds, and after 5 unsuccessfull pings it will set status 'alert';
  • fetch top 5 news from every minute, and in case of 10 failures it will set 'info' status to the watcher.


Any help, critique, suggestions, requests, advises... are welcome. Especially, I have troubles with Gtk2 UI.

Current road map can be found here


PerlWatcher is written in Modern Perl using AnyEvent and Moo.

PerlWatcher is composed of Engine (including basic watchers) and UI. Watchers are completly decoupled from UI, so it should be possible to use any possible Watcher with any UI. Currently UI frontend use GTK2+, but it should be easy to use the others, like: KDE, console or even aggregate it as tmux-extension.


This software is copyright (c) 2013 by Ivan Baidakou.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.