Fix empty and different level naming

reqwest-retry/src/middleware.rs

@@ -22,6 +22,7 @@ use ::log as LogTracing;
 #[doc(hidden)]
 // We need this macro because tracing expects the level to be const:
 // https://github.com/tokio-rs/tracing/issues/2730
+#[cfg(feature = "tracing")]
 macro_rules! log_retry {
     ($level:expr, $($args:tt)*) => {{
         match $level {
@@ -34,6 +35,13 @@ macro_rules! log_retry {
     }};
 }
 
+#[cfg(all(feature = "log", not(feature = "tracing")))]
+macro_rules! log_retry {
+    ($level:expr, $($args:tt)*) => {{
+        LogTracing::log!($level, $($args)*)
+    }};
+}
+
 /// `RetryTransientMiddleware` offers retry logic for requests that fail in a transient manner
 /// and can be safely executed again.
 ///
@@ -108,7 +116,10 @@ where
         Self {
             retry_policy,
             retryable_strategy,
+            #[cfg(feature = "tracing")]
             retry_log_level: LogLevel::WARN,
+            #[cfg(all(feature = "log", not(feature = "tracing")))]
+            retry_log_level: LogLevel::Warn,
         }
     }
 }
@@ -175,6 +186,7 @@ where
                             .duration_since(SystemTime::now())
                             .unwrap_or_else(|_| Duration::default());
                         // Sleep the requested amount before we try again.
+                        #[cfg(any(feature = "log", feature = "tracing"))]
                         log_retry!(
                             self.retry_log_level,
                             "Retry attempt #{}. Sleeping {:?} before the next attempt",