add handler name to request as endpoint

sanic/app.py

@@ -247,6 +247,7 @@ class Sanic:
         def response(handler):
             async def websocket_handler(request, *args, **kwargs):
                 request.app = self
+                request.endpoint = handler.__name__
                 try:
                     protocol = request.transport.get_protocol()
                 except AttributeError:
@@ -540,6 +541,7 @@ class Sanic:
 
                 # Fetch handler from router
                 handler, args, kwargs, uri = self.router.get(request)
+                request.endpoint = handler.__name__
                 request.uri_template = uri
                 if handler is None:
                     raise ServerError(

sanic/request.py

@@ -46,7 +46,8 @@ class Request(dict):
     __slots__ = (
         'app', 'headers', 'version', 'method', '_cookies', 'transport',
         'body', 'parsed_json', 'parsed_args', 'parsed_form', 'parsed_files',
-        '_ip', '_parsed_url', 'uri_template', 'stream', '_remote_addr'
+        '_ip', '_parsed_url', 'uri_template', 'stream', '_remote_addr',
+        'endpoint',
     )
 
     def __init__(self, url_bytes, headers, version, method, transport):
@@ -68,6 +69,7 @@ class Request(dict):
         self.uri_template = None
         self._cookies = None
         self.stream = None
+        self.endpoint = None
 
     def __repr__(self):
         if self.method is None or not self.path: