root: further cleanup in asgi logger

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/root/asgi.py

@@ -8,7 +8,6 @@ https://docs.djangoproject.com/en/3.0/howto/deployment/asgi/
 """
 import typing
 from time import time
-from typing import Any, ByteString
 
 import django
 from asgiref.compatibility import guarantee_single_callable
@@ -51,20 +50,15 @@ class ASGILogger:
 
     app: ASGIApp
 
-    headers: dict[ByteString, Any]
-
     status_code: int
     start: float
-    content_length: int
-    request_id: str
 
     def __init__(self, app: ASGIApp):
         self.app = app
 
     async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
-        self.content_length = 0
-        self.headers = dict(scope.get("headers", []))
-        self.request_id = ""
+        content_length = 0
+        request_id = ""
 
         async def send_hooked(message: Message) -> None:
             """Hooked send method, which records status code and content-length, and for the final
@@ -74,11 +68,13 @@ class ASGILogger:
                 self.status_code = message["status"]
 
             if b"Content-Length" in headers:
-                self.content_length += int(headers.get(b"Content-Length", b"0"))
+                nonlocal content_length
+                content_length += int(headers.get(b"Content-Length", b"0"))
 
             if message["type"] == "http.response.start":
                 response_headers = dict(message["headers"])
-                self.request_id = response_headers.get(
+                nonlocal request_id
+                request_id = response_headers.get(
                     RESPONSE_HEADER_ID.encode(), b""
                 ).decode()
 
@@ -86,7 +82,7 @@ class ASGILogger:
                 "more_body", True
             ):
                 runtime = int((time() - self.start) * 1000)
-                self.log(scope, runtime, request_id=self.request_id)
+                self.log(scope, runtime, content_length, request_id=request_id)
             await send(message)
 
         self.start = time()
@@ -98,15 +94,16 @@ class ASGILogger:
 
     def _get_ip(self, scope: Scope) -> str:
         client_ip = None
+        headers = dict(scope.get("headers", []))
         for header in ASGI_IP_HEADERS:
-            if header in self.headers:
-                client_ip = self.headers[header].decode()
+            if header in headers:
+                client_ip = headers[header].decode()
         if not client_ip:
             client_ip, _ = scope.get("client", ("", 0))
         # Check if header has multiple values, and use the first one
         return client_ip.split(", ")[0]
 
-    def log(self, scope: Scope, runtime: float, **kwargs):
+    def log(self, scope: Scope, content_length: int, runtime: float, **kwargs):
         """Outpot access logs in a structured format"""
         host = self._get_ip(scope)
         query_string = ""
@@ -118,7 +115,7 @@ class ASGILogger:
             method=scope.get("method", ""),
             scheme=scope.get("scheme", ""),
             status=self.status_code,
-            size=self.content_length / 1000 if self.content_length > 0 else 0,
+            size=content_length / 1000 if content_length > 0 else 0,
             runtime=runtime,
             **kwargs,
         )