limit: Forward tower_load::Load (#429)

tower-limit/Cargo.toml

@@ -25,6 +25,7 @@ edition = "2018"
 futures-core = { version = "0.3", default-features = false }
 tower-service = "0.3"
 tower-layer = "0.3"
+tower-load = "0.3"
 tokio = { version = "0.2", features = ["time"] }
 pin-project = "0.4"
 

tower-limit/src/concurrency/service.rs

@@ -86,6 +86,16 @@ where
     }
 }
 
+impl<S> tower_load::Load for ConcurrencyLimit<S>
+where
+    S: tower_load::Load,
+{
+    type Metric = S::Metric;
+    fn load(&self) -> Self::Metric {
+        self.inner.load()
+    }
+}
+
 impl<S> Clone for ConcurrencyLimit<S>
 where
     S: Clone,

tower-limit/src/rate/service.rs

@@ -108,3 +108,13 @@ where
         }
     }
 }
+
+impl<S> tower_load::Load for RateLimit<S>
+where
+    S: tower_load::Load,
+{
+    type Metric = S::Metric;
+    fn load(&self) -> Self::Metric {
+        self.inner.load()
+    }
+}