do not create sender at close (#208)

Author: methane

fluent/asynchandler.py

@@ -8,19 +8,3 @@ class FluentHandler(handler.FluentHandler):
 
     def getSenderClass(self):
         return asyncsender.FluentSender
-
-    def close(self):
-        self.acquire()
-        try:
-            try:
-                self.sender.close()
-            finally:
-                super().close()
-        finally:
-            self.release()
-
-    def __enter__(self):
-        return self
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        self.close()

fluent/handler.py

@@ -264,7 +264,9 @@ def close(self):
         self.acquire()
         try:
             try:
-                self.sender.close()
+                if self._sender is not None:
+                    self._sender.close()
+                    self._sender = None
             finally:
                 super().close()
         finally: