As work on webinterface for YaST is in progress we must learn new technologies suitable for web development. WebYast will be written in ruby and ruby on rails framework. Also because WebYast is new interface it could contain AJAX features for better user comfort. Today I found that ajax support in RoR is on good level and with documentation it takes few minutes to create first example which show current used memory on server. It is not connected anyhow to YaST because I want to focus on AJAX.
And here is a code. It update page every fifth second (but not refresh only update div, on bigger page it is really significant):
/views/home/index.html.erb:
<%= javascript_include_tag :defaults %>
<h1>Hello world!</h1>
<%= periodically_call_remote(:url => { :action => 'get_averages' }, :update => 'avg',:frequency => '5') %>
<div id="avg">
Memory usage is X MB </div>
controllers/home_controller.rb:
class HomeController < ApplicationController
def index
end
def get_averages
output = `free -m` # bash solution - | sed 's/Mem:[^0-9]+[0-9]+[^0-9]+([0-9]+).*$/1/;2q;1d'`
output = $1 if (output =~ /.*n(.*)n.*n.*n/) #let live second line
output = $1 if (output =~ /.*:s+S+s+(S+)s+/) #second field
render :text => "Usage mem is "+output+"MB RAM."
end
end
And thats all to watch your server usage.
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