Log bytes count

Cargo.toml

@@ -16,6 +16,7 @@ edition = "2018"
 actix-threadpool = "0.3.2"
 bytes = "0.5.4"
 futures = "0.3.5"
+log = "0.4"
 thiserror = "1.0"
 
 [dev-dependencies]

src/file.rs

@@ -592,6 +592,7 @@ where
 
     fn start_send(mut self: Pin<&mut Self>, item: Bytes) -> Result<(), Self::Error> {
         let mut file = self.file.take().expect("Use after completion");
+        log::debug!("Writing {} bytes", item.len());
 
         self.fut = Some(
             run(move || {