feature #1370: select session storage in configuration

src/sunstone/etc/sunstone-server.conf

@@ -31,6 +31,16 @@
 :host: 127.0.0.1
 :port: 9869
 
+# Place where to store sessions, this value can be memory or memcache
+# Use memcache when starting multiple server processes, for example,
+# with passenger
+:sessions: memory
+
+# Memcache configuration
+:memcache_host: localhost
+:memcache_port: 11211
+:memcache_namespace: opennebula.sunstone
+
 ################################################################################
 # Log
 ################################################################################

src/sunstone/sunstone-server.rb

@@ -80,7 +80,23 @@ set :config, conf
 set :bind, settings.config[:host]
 set :port, settings.config[:port]
 
-use Rack::Session::Pool, :key => 'sunstone'
+case settings.config[:sessions]
+when 'memory'
+    use Rack::Session::Pool, :key => 'sunstone'
+when 'memcache'
+    memcache_server=settings.config[:memcache_host]+':'<<
+        settings.config[:memcache_port].to_s
+
+    STDERR.puts memcache_server
+
+    use Rack::Session::Memcache,
+        :memcache_server => memcache_server,
+        :namespace => settings.config[:memcache_namespace]
+
+else
+    STDERR.puts "Wrong value for :sessions in configuration file"
+    exit(-1)
+end
 
 # Enable logger