Moved panick_hook to util/panic_hook (#7629)

util/panic_hook/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+description = "Parity custom panic hook"
+homepage = "http://parity.io"
+license = "GPL-3.0"
+name = "panic_hook"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+
+[dependencies]
+backtrace = "0.3.2"

util/panic_hook/src/lib.rs

@@ -0,0 +1,69 @@
+// 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/>.
+
+//! Custom panic hook with bug report link
+
+extern crate backtrace;
+
+use std::io::{self, Write};
+use std::panic::{self, PanicInfo};
+use std::thread;
+use backtrace::Backtrace;
+
+/// Set the panic hook
+pub fn set() {
+	panic::set_hook(Box::new(panic_hook));
+}
+
+static ABOUT_PANIC: &str = "
+This is a bug. Please report it at:
+
+    https://github.com/paritytech/parity/issues/new
+";
+
+fn panic_hook(info: &PanicInfo) {
+	let location = info.location();
+	let file = location.as_ref().map(|l| l.file()).unwrap_or("<unknown>");
+	let line = location.as_ref().map(|l| l.line()).unwrap_or(0);
+
+	let msg = match info.payload().downcast_ref::<&'static str>() {
+		Some(s) => *s,
+		None => match info.payload().downcast_ref::<String>() {
+			Some(s) => &s[..],
+			None => "Box<Any>",
+		}
+	};
+
+	let thread = thread::current();
+	let name = thread.name().unwrap_or("<unnamed>");
+
+	let backtrace = Backtrace::new();
+
+	let mut stderr = io::stderr();
+
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(stderr, "====================");
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(stderr, "{:?}", backtrace);
+	let _ = writeln!(stderr, "");
+	let _ = writeln!(
+		stderr,
+		"Thread '{}' panicked at '{}', {}:{}",
+		name, msg, file, line
+	);
+
+	let _ = writeln!(stderr, "{}", ABOUT_PANIC);
+}