Class: Nanite::Admin

Inherits:
Object show all
Defined in:
lib/nanite/admin.rb

Overview

This is a Rack app for nanite-admin. You need to have an async capable version of Thin installed for this to work. See bin/nanite-admin for install instructions.

Constant Summary collapse

AsyncResponse = 
[-1, {}, []].freeze

Instance Method Summary collapse

Constructor Details

#initialize(mapper) ⇒ Admin

Returns a new instance of Admin.



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# File 'lib/nanite/admin.rb', line 8

def initialize(mapper)
  @mapper = mapper
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/nanite/admin.rb', line 14

def call(env)
  req = Rack::Request.new(env)
  if cmd = req.params['command']
    @command = cmd
    @selection = req.params['type'] if req.params['type']
    
    options = {}
    case @selection
    when 'least_loaded', 'random', 'all', 'rr'
      options[:selector] = @selection
    else
      options[:target] = @selection
    end

    @mapper.request(cmd, req.params['payload'], options) do |response, responsejob|
      env['async.callback'].call [200, {'Content-Type' => 'text/html'}, [layout(ul(response, responsejob))]]
    end
    AsyncResponse
  else
    [200, {'Content-Type' => 'text/html'}, layout]
  end
end

#layout(content = nil) ⇒ Object 



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# File 'lib/nanite/admin.rb', line 59

def layout(content=nil)
  %Q{
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns='http://www.w3.org/1999/xhtml'>
      <head>
        <meta content='text/html; charset=utf-8' http-equiv='Content-Type' />
        <meta content='en' http-equiv='Content-Language' />
        <meta content='Engineyard' name='author' />
        <title>Nanite Control Tower</title>

        <style>
          body {margin: 0; font-family: verdana; background-color: #fcfcfc;}
          ul {margin: 0; padding: 0; margin-left: 10px}
          li {list-style-type: none; margin-bottom: 6px}
          li .nanite {font-weight: bold; font-size: 12px}
          li .response {padding: 8px}
          li .intermediatestates {padding: 8px; font-size: 10px;}
          li .intermediatestates span.statenote {font-style: italic;}
          h1, h2, h3 {margin-top: none; padding: none; margin-left: 40px;}
          h1 {font-size: 22px; margin-top: 40px; margin-bottom: 30px; border-bottom: 1px solid #ddd; padding-bottom: 6px;
            margin-right: 40px}
          h2 {font-size: 16px;}
          h3 {margin-left: 0; font-size: 14px}
          .section {border: 1px solid #ccc; background-color: #fefefe; padding: 10px; margin: 20px 40px; padding: 20px;
            font-size: 14px}
          #footer {text-align: center; color: #AAA; font-size: 12px}
        </style>

      </head>

      <body>
        <div id="header">
          <h1>Nanite Control Tower</h1>
        </div>

        <h2>#{@mapper.options[:vhost]}</h2>
        <div class="section">
          <form method="post" action="/">
            <input type="hidden" value="POST" name="_method"/>

              <label>Send</label>
              <select name="type">
                <option #{@selection == 'least_loaded' ? 'selected="true"' : ''} value="least_loaded">the least loaded nanite</option>
                <option #{@selection == 'random' ? 'selected="true"' : ''} value="random">a random nanite</option>
                <option #{@selection == 'all' ? 'selected="true"' : ''} value="all">all nanites</option>
                <option #{@selection == 'rr' ? 'selected="true"' : ''} value="rr">a nanite chosen by round robin</option>
                #{@mapper.cluster.nanites.map {|k,v| "<option #{@selection == k ? 'selected="true"' : ''} value='#{k}'>#{k}</option>" }.join}
              </select>

              <label>providing service</label>
              #{services}

              <label>the payload</label>
              <input type="text" class="text" name="payload" id="payload"/>

              <input type="submit" class="submit" value="Go!" name="submit"/>
          </form>

          #{"<h3>Responses</h3>" if content}
          #{content}
        </div>

        <h2>Running nanites</h2>
        <div class="section">
          #{"No nanites online." if @mapper.cluster.nanites.size == 0}
          <ul>
            #{@mapper.cluster.nanites.map {|k,v| "<li>identity : #{k}<br />load : #{v[:status]}<br />services : #{v[:services].to_a.inspect}<br />tags: #{v[:tags].to_a.inspect}</li>" }.join}
          </ul>
        </div>
        <div id="footer">
          Nanite #{Nanite::VERSION}
          <br />
          &copy; 2009 a bunch of random geeks
        </div>
      </body>
    </html>
  }
end

#services ⇒ Object 



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# File 'lib/nanite/admin.rb', line 37

def services
  buf = "<select name='command'>"
  @mapper.cluster.nanites.all_services.each do |srv|
    buf << "<option value='#{srv}' #{@command == srv ? 'selected="true"' : ''}>#{srv}</option>"
  end
  buf << "</select>"
  buf
end

#ul(hash, job) ⇒ Object 



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# File 'lib/nanite/admin.rb', line 46

def ul(hash, job)
  buf = "<ul>"
  hash.each do |k,v|
    buf << "<li><div class=\"nanite\">#{k}:</div><div class=\"response\">#{v.inspect}</div>"
    if job.intermediate_state && job.intermediate_state[k]
      buf << "<div class=\"intermediatestates\"><span class=\"statenote\">intermediate state:</span> #{job.intermediate_state[k].inspect}</div>"
    end
    buf << "</li>"
  end
  buf << "</ul>"
  buf
end