fixup! Server: rewrite to use fibers and non-blocking IO

lib/moneta/server.rb

@@ -82,7 +82,7 @@ def write(obj)
         buffer = pack(obj)
         until buffer.empty?
           begin
-            len = @io.sendmsg_nonblock(buffer)
+            len = @io.write_nonblock(buffer)
             buffer = buffer.byteslice(len...buffer.length)
           rescue IO::WaitWritable, Errno::EINTR
             yield_to_reactor(:write)
@@ -226,6 +226,7 @@ def delete_connection(io)
     def close_connection(io)
       delete_connection(io)
       @connections.delete(io).resume(:close)
+    rescue FiberError
     end
 
     def resume(io)
@@ -259,5 +260,14 @@ def start(options)
         TCPServer.open(options[:host] || '127.0.0.1', options[:port] || 9000)
       end
     end
+
+    def stats
+      {
+        connections: @connections.length,
+        reading: @reads.length,
+        writing: @writes.length,
+        total: @ios.length
+      }
+    end
   end
 end