Add performance tracing to validate_transaction (#5671)

* Validate transaction timeouts

* Add timing

* Add tracing to transaction validation.

* Fix docs.

Co-authored-by: NikVolf <nikvolf@gmail.com>

substrate/frame/executive/src/lib.rs

@@ -348,11 +348,25 @@ where
 		source: TransactionSource,
 		uxt: Block::Extrinsic,
 	) -> TransactionValidity {
-		let encoded_len = uxt.using_encoded(|d| d.len());
-		let xt = uxt.check(&Default::default())?;
+		use frame_support::tracing_span;
 
-		let dispatch_info = xt.get_dispatch_info();
-		xt.validate::<UnsignedValidator>(source, &dispatch_info, encoded_len)
+		tracing_span!{ "validate_transaction::using_encoded";
+			let encoded_len = uxt.using_encoded(|d| d.len());
+		};
+
+		tracing_span!{ "validate_transaction::check";
+			let xt = uxt.check(&Default::default())?;
+		};
+
+		tracing_span!{ "validate_transaction::dispatch_info";
+			let dispatch_info = xt.get_dispatch_info();
+		};
+
+		tracing_span!{ "validate_transaction::validate";
+			let result = xt.validate::<UnsignedValidator>(source, &dispatch_info, encoded_len);
+		};
+
+		result
 	}
 
 	/// Start an offchain worker and generate extrinsics.

substrate/frame/support/src/lib.rs

@@ -222,6 +222,38 @@ macro_rules! assert_ok {
 	}
 }
 
+/// Runs given code within a tracing span, measuring it's execution time.
+///
+/// Has effect only when running in native environment. In WASM, it simply inserts the
+/// code in-place, without any metrics added.
+#[macro_export]
+macro_rules! tracing_span {
+	($name:expr; $( $code:tt )*) => {
+		let span = $crate::if_tracing!(
+			$crate::tracing::span!($crate::tracing::Level::TRACE, $name)
+		,
+			()
+		);
+		let guard = $crate::if_tracing!(span.enter(), ());
+		$( $code )*
+
+		$crate::sp_std::mem::drop(guard);
+		$crate::sp_std::mem::drop(span);
+	}
+}
+
+#[macro_export]
+#[cfg(feature = "tracing")]
+macro_rules! if_tracing {
+	( $if:expr, $else:expr ) => {{ $if }}
+}
+
+#[macro_export]
+#[cfg(not(feature = "tracing"))]
+macro_rules! if_tracing {
+	( $if:expr, $else:expr ) => {{ $else }}
+}
+
 /// The void type - it cannot exist.
 // Oh rust, you crack me up...
 #[derive(Clone, Eq, PartialEq, RuntimeDebug)]