inital commit, which is clearly not initial

Signed-off-by: Uncle Stretch <uncle.stretch@ghostchain.io>

metrics/src/lib.rs

@@ -0,0 +1,47 @@
+pub use metered;
+
+pub mod metronome;
+pub use self::metronome::Metronome;
+
+#[cfg(feature = "runtime-metrics")]
+pub mod runtime;
+#[cfg(feature = "runtime-metrics")]
+pub use self::runtime::logger_hook;
+
+/// Export a dummy logger hook when the `runtime-metrics` feature is not enbaled.
+#[cfg(not(feature = "runtime-metrics"))]
+pub fn logger_hook() -> impl FnOnce(&mut sc_cli::LoggerBuilder, &sc_service::Configuration) {
+    |_logger_builder, _config| {}
+}
+
+/// This module exports Prometheus types an:d defines 
+/// the [`Metrics`](metrics::Metrics) trait.
+pub mod metrics {
+    pub use prometheus_endpoint as prometheus;
+
+    pub trait Metrics: Default + Clone {
+        fn try_register(
+            registry: &prometheus::Registry,
+        ) -> Result<Self, prometheus::PrometheusError>;
+
+        fn register(
+            registry: Option<&prometheus::Registry>,
+        ) -> Result<Self, prometheus::PrometheusError> {
+            match registry {
+                None => Ok(Self::default()),
+                Some(registry) => Self::try_register(registry),
+            }
+        }
+    }
+
+    impl Metrics for () {
+        fn try_register(
+            _registry: &prometheus::Registry,
+        ) -> Result<(), prometheus::PrometheusError> {
+            Ok(())
+        }
+    }
+}
+
+#[cfg(all(feature = "runtime-metrics", not(feature = "runtime-benchmarks"), test))]
+mod tests;