Convert metadata_length logging to CustomMetadata

Author: jtgeibel

src/controllers/krate/publish.rs

@@ -232,7 +232,7 @@ pub fn publish(req: &mut dyn Request) -> AppResult<Response> {
 fn parse_new_headers(req: &mut dyn Request) -> AppResult<EncodableCrateUpload> {
     // Read the json upload request
     let metadata_length = u64::from(read_le_u32(req.body())?);
-    req.mut_extensions().insert(metadata_length);
+    req.log_metadata("metadata_length", metadata_length);
 
     let max = req.app().config.max_upload_size;
     if metadata_length > max {

src/middleware/log_request.rs

@@ -98,10 +98,6 @@ impl Display for RequestLine<'_> {
             }
         }
 
-        if let Some(len) = self.req.extensions().find::<u64>() {
-            line.add_field("metadata_length", len)?;
-        }
-
         if let Err(err) = self.res {
             line.add_quoted_field("error", err)?;
         }