Record clone times in Redis, add a '/status' API endpoint

lib/vmpooler/api.rb

@@ -168,6 +168,47 @@ module Vmpooler
           JSON.pretty_generate(result)
         end
 
+        get '/status/?' do
+          content_type :json
+
+          result = {}
+          clone_times = []
+
+          result['capacity_current'] = 0
+          result['capacity_total'] = 0
+
+          result['status'] = 1
+
+          $config[:pools].each do |pool|
+            pool['capacity_current'] = $redis.scard( 'vmpooler__ready__' + pool['name'] ).to_i 
+
+            result['capacity_current'] += pool['capacity_current']
+            result['capacity_total'] += pool['size'].to_i
+
+            if ( pool['capacity_current'] == 0 )
+              result['empty'] ||= []
+              result['empty'].push( pool['name'] )
+            end
+
+            $redis.smembers( 'vmpooler__ready__'+pool['name'] ).each do |vm|
+              clone_time = $redis.hget( 'vmpooler__vm__'+vm, 'clone_time' )
+              clone_times.push( clone_time ) if clone_time.to_f > 0
+            end
+          end
+
+          if ( result['empty'] )
+            result['status'] = 0
+          end
+
+          if ( clone_times.any? )
+            result['clone_average'] = clone_times.map( &:to_f ).reduce( :+ ) / clone_times.size
+          end
+
+          result['capacity_perecent'] = ( result['capacity_current'].to_f / result['capacity_total'].to_f ) * 100.0
+
+          JSON.pretty_generate(Hash[result.sort_by{|k,v| k}])
+        end
+
         get '/vm/?' do
           content_type :json