core: custom slog handlers for modules (log contextual data) (#7346)

modules/caddyhttp/server.go

@@ -793,8 +793,10 @@ func (s *Server) logRequest(
 	accLog *zap.Logger, r *http.Request, wrec ResponseRecorder, duration *time.Duration,
 	repl *caddy.Replacer, bodyReader *lengthReader, shouldLogCredentials bool,
 ) {
+	ctx := r.Context()
+
 	// this request may be flagged as omitted from the logs
-	if skip, ok := GetVar(r.Context(), LogSkipVar).(bool); ok && skip {
+	if skip, ok := GetVar(ctx, LogSkipVar).(bool); ok && skip {
 		return
 	}
 
@@ -812,7 +814,7 @@ func (s *Server) logRequest(
 	}
 
 	message := "handled request"
-	if nop, ok := GetVar(r.Context(), "unhandled").(bool); ok && nop {
+	if nop, ok := GetVar(ctx, "unhandled").(bool); ok && nop {
 		message = "NOP"
 	}
 
@@ -836,7 +838,7 @@ func (s *Server) logRequest(
 				reqBodyLength = bodyReader.Length
 			}
 
-			extra := r.Context().Value(ExtraLogFieldsCtxKey).(*ExtraLogFields)
+			extra := ctx.Value(ExtraLogFieldsCtxKey).(*ExtraLogFields)
 
 			fieldCount := 6
 			fields = make([]zapcore.Field, 0, fieldCount+len(extra.fields))