Rescue from any error from SerfEventHandler

lib/droonga/command/serf_event_handler.rb

@@ -39,6 +39,13 @@ def run
         command.process if command.should_process?
         output_response(command.response)
         true
+      rescue Exception => exception
+        #XXX Any exception blocks following serf operations.
+        #    To keep it working, I rescue any exception for now.
+        File.open(Path.serf_event_handler_error_file, "w") do |file|
+          file.write(exception.inspect)
+        end
+        true
       end
 
       private

lib/droonga/path.rb

@@ -74,6 +74,14 @@ def buffer
       def serf_event_handler_errors
         state + "serf-event-handler-errors"
       end
+
+      def serf_event_handler_error_file
+        now = Time.now
+        name = sprintf("%04d-%02d-%02d_%02d-%02d-%02d.%d.error",
+                       now.year, now.month, now.day,
+                       now.hour, now.min, now.sec, now.nsec)
+        serf_event_handler_errors + name
+      end
     end
   end
 end