From 5ed3c71b12ddfcc9a11753d213c8def11c32f3bf Mon Sep 17 00:00:00 2001
From: Marek Kotewicz <marek.kotewicz@gmail.com>
Date: Fri, 23 Feb 2018 19:49:08 +0100
Subject: [PATCH] moved PerfTimer to a separate crate - "trace-time" (#7985)

---
 Cargo.toml |  8 ++++++++
 src/lib.rs | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..e184f66
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "trace-time"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+time = "0.1.34"
+log = "0.3"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..3848135
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,53 @@
+// Copyright 2015-2017 Parity Technologies (UK) Ltd.
+// This file is part of Parity.
+
+// Parity is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Parity is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Parity.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Performance timer with logging
+
+extern crate time;
+#[macro_use]
+extern crate log;
+
+use time::precise_time_ns;
+
+#[macro_export]
+macro_rules! trace_time {
+	($name: expr) => {
+		let _timer = $crate::PerfTimer::new($name);
+	}
+}
+
+/// Performance timer with logging. Starts measuring time in the constructor, prints
+/// elapsed time in the destructor or when `stop` is called.
+pub struct PerfTimer {
+	name: &'static str,
+	start: u64,
+}
+
+impl PerfTimer {
+	/// Create an instance with given name.
+	pub fn new(name: &'static str) -> PerfTimer {
+		PerfTimer {
+			name,
+			start: precise_time_ns(),
+		}
+	}
+}
+
+impl Drop for PerfTimer {
+	fn drop(&mut self) {
+		trace!(target: "perf", "{}: {:.2}ms", self.name, (precise_time_ns()  - self.start) as f32 / 1000_000.0);
+	}
+}