asgi: Fix pylint and pycodestyle warnings

- Remove unused imports (ssl, os, base64, hashlib, traceback)
- Remove unused variables (body_parts, has_content_length, etc.)
- Fix no-else-break patterns in protocol.py and websocket.py
- Replace __anext__() with anext() builtin
- Remove unnecessary pass statements
- Add proper access logging to ASGI protocol handler
- Add ASGIResponseInfo class and _build_environ method for logging
- Disable too-many-return-statements for _read_frame method
- Fix raising-bad-type error (use 'is not None' check)
- Fix whitespace before colon in message.py

gunicorn/asgi/message.py

@@ -477,7 +477,7 @@ class AsyncRequest:
             self._body_reader = self._chunked_body_reader()
 
         try:
-            return await self._body_reader.__anext__()
+            return await anext(self._body_reader)
         except StopAsyncIteration:
             self._body_remaining = 0
             return b""

gunicorn/asgi/protocol.py

@@ -10,9 +10,6 @@ to ASGI applications.
 """
 
 import asyncio
-import base64
-import hashlib
-import traceback
 from datetime import datetime
 
 from gunicorn.asgi.unreader import AsyncUnreader
@@ -20,6 +17,22 @@ from gunicorn.asgi.message import AsyncRequest
 from gunicorn.http.errors import NoMoreData
 
 
+class ASGIResponseInfo:
+    """Simple container for ASGI response info for access logging."""
+
+    def __init__(self, status, headers, sent):
+        self.status = status
+        self.sent = sent
+        # Convert headers to list of string tuples for logging
+        self.headers = []
+        for name, value in headers:
+            if isinstance(name, bytes):
+                name = name.decode("latin-1")
+            if isinstance(value, bytes):
+                value = value.decode("latin-1")
+            self.headers.append((name, value))
+
+
 class ASGIProtocol(asyncio.Protocol):
     """HTTP/1.1 protocol handler for ASGI applications.
 
@@ -97,7 +110,7 @@ class ASGIProtocol(asyncio.Protocol):
                 if self._is_websocket_upgrade(request):
                     await self._handle_websocket(request, sockname, peername)
                     break  # WebSocket takes over the connection
-                else:
+
                 # Handle HTTP request
                 keepalive = await self._handle_http_request(
                     request, sockname, peername
@@ -155,9 +168,13 @@ class ASGIProtocol(asyncio.Protocol):
         scope = self._build_http_scope(request, sockname, peername)
         response_started = False
         response_complete = False
-        body_parts = []
         exc_to_raise = None
 
+        # Response tracking for access logging
+        response_status = 500
+        response_headers = []
+        response_sent = 0
+
         # Receive queue for body
         receive_queue = asyncio.Queue()
 
@@ -177,6 +194,7 @@ class ASGIProtocol(asyncio.Protocol):
 
         async def send(message):
             nonlocal response_started, response_complete, exc_to_raise
+            nonlocal response_status, response_headers, response_sent
 
             msg_type = message["type"]
 
@@ -185,9 +203,9 @@ class ASGIProtocol(asyncio.Protocol):
                     exc_to_raise = RuntimeError("Response already started")
                     return
                 response_started = True
-                status = message["status"]
+                response_status = message["status"]
-                headers = message.get("headers", [])
+                response_headers = message.get("headers", [])
-                await self._send_response_start(status, headers, request)
+                await self._send_response_start(response_status, response_headers, request)
 
             elif msg_type == "http.response.body":
                 if not response_started:
@@ -202,32 +220,42 @@ class ASGIProtocol(asyncio.Protocol):
 
                 if body:
                     await self._send_body(body)
+                    response_sent += len(body)
 
                 if not more_body:
                     response_complete = True
 
+        # Build environ for logging
+        environ = self._build_environ(request, sockname, peername)
+        resp = None
+
         try:
             request_start = datetime.now()
             self.cfg.pre_request(self.worker, request)
 
             await self.app(scope, receive, send)
 
-            if exc_to_raise:
+            if exc_to_raise is not None:
                 raise exc_to_raise
 
             # Ensure response was sent
             if not response_started:
                 await self._send_error_response(500, "Internal Server Error")
+                response_status = 500
 
-        except Exception as e:
+        except Exception:
             self.log.exception("Error in ASGI application")
             if not response_started:
                 await self._send_error_response(500, "Internal Server Error")
+                response_status = 500
             return False
         finally:
             try:
                 request_time = datetime.now() - request_start
-                self.cfg.post_request(self.worker, request, {}, None)
+                # Create response info for logging
+                resp = ASGIResponseInfo(response_status, response_headers, response_sent)
+                self.log.access(resp, request, environ, request_time)
+                self.cfg.post_request(self.worker, request, environ, resp)
             except Exception:
                 self.log.exception("Exception in post_request hook")
 
@@ -291,6 +319,24 @@ class ASGIProtocol(asyncio.Protocol):
 
         return scope
 
+    def _build_environ(self, request, sockname, peername):
+        """Build minimal WSGI-like environ dict for access logging."""
+        environ = {
+            "REQUEST_METHOD": request.method,
+            "RAW_URI": request.uri,
+            "PATH_INFO": request.path,
+            "QUERY_STRING": request.query or "",
+            "SERVER_PROTOCOL": f"HTTP/{request.version[0]}.{request.version[1]}",
+            "REMOTE_ADDR": peername[0] if peername else "-",
+        }
+
+        # Add HTTP headers as environ vars
+        for name, value in request.headers:
+            key = "HTTP_" + name.replace("-", "_")
+            environ[key] = value
+
+        return environ
+
     def _build_websocket_scope(self, request, sockname, peername):
         """Build ASGI WebSocket scope from parsed request."""
         # Build headers list as bytes tuples
@@ -334,9 +380,6 @@ class ASGIProtocol(asyncio.Protocol):
 
         # Build headers
         header_lines = []
-        has_content_length = False
-        has_transfer_encoding = False
-        has_connection = False
 
         for name, value in headers:
             if isinstance(name, bytes):
@@ -344,13 +387,6 @@ class ASGIProtocol(asyncio.Protocol):
             if isinstance(value, bytes):
                 value = value.decode("latin-1")
             header_lines.append(f"{name}: {value}\r\n")
-            name_lower = name.lower()
-            if name_lower == "content-length":
-                has_content_length = True
-            elif name_lower == "transfer-encoding":
-                has_transfer_encoding = True
-            elif name_lower == "connection":
-                has_connection = True
 
         # Add server header if not present
         header_lines.append("Server: gunicorn/asgi\r\n")

gunicorn/asgi/websocket.py

@@ -12,7 +12,6 @@ import asyncio
 import base64
 import hashlib
 import struct
-import os
 
 
 # WebSocket frame opcodes
@@ -81,7 +80,7 @@ class WebSocketProtocol:
 
         try:
             await self.app(self.scope, self._receive, self._send)
-        except Exception as e:
+        except Exception:
             self.log.exception("Error in WebSocket ASGI application")
         finally:
             read_task.cancel()
@@ -180,7 +179,8 @@ class WebSocketProtocol:
                 if opcode == OPCODE_CLOSE:
                     await self._handle_close(payload)
                     break
-                elif opcode == OPCODE_PING:
+
+                if opcode == OPCODE_PING:
                     await self._send_frame(OPCODE_PONG, payload)
                 elif opcode == OPCODE_PONG:
                     # Ignore pongs
@@ -212,7 +212,7 @@ class WebSocketProtocol:
                     "code": self.close_code or CLOSE_ABNORMAL,
                 })
 
-    async def _read_frame(self):
+    async def _read_frame(self):  # pylint: disable=too-many-return-statements
         """Read a single WebSocket frame.
 
         Returns:
@@ -326,10 +326,9 @@ class WebSocketProtocol:
 
         self.closed = True
 
-    async def _handle_continuation(self, payload):
+    async def _handle_continuation(self, payload):  # pylint: disable=unused-argument
         """Handle continuation frame (already processed in _read_frame)."""
-        # This is called for partial fragments, nothing to do
+        # This is called for partial fragments, nothing to do here
-        pass
 
     async def _send_frame(self, opcode, payload):
         """Send a WebSocket frame.

gunicorn/workers/gasgi.py

@@ -12,7 +12,6 @@ HTTP parsing infrastructure.
 import asyncio
 import os
 import signal
-import ssl
 import sys
 
 from gunicorn.workers import base