Proof of concept: Add a new runtime that uses pallet_contracts (#186)

* seal: Copy over a legacy version of pallet_contracts from substrate

* seal: Fix substrate dependency pathes and add as dependency to runtime

* seal: Adapt pallet to current substrate version

* seal: Add contracts pallet to runtime

* seal: Implement rpc runtime api

* seal: Update to latest rpc output format

* seal: Replace child trie by prefix trie

* seal: Add contracts endpoint to the client

* seal: fixup rpc test

* Fix whitespace issue

Co-authored-by: Sergei Shulepov <sergei@parity.io>

* seal: Move pallet out of the runtime directory

* seal: Create a seperate runtime for contracts

* Move parachains to top level directory

* seal: Disable rent for easier testing

Co-authored-by: Sergei Shulepov <sergei@parity.io>

cumulus/rococo-parachains/tests/running_the_node_and_interrupt.rs

@@ -0,0 +1,56 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate 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.
+
+// Substrate 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+use assert_cmd::cargo::cargo_bin;
+use std::{convert::TryInto, fs, process::Command, thread, time::Duration};
+
+mod common;
+
+#[test]
+#[cfg(unix)]
+fn running_the_node_works_and_can_be_interrupted() {
+	use nix::{
+		sys::signal::{
+			kill,
+			Signal::{self, SIGINT, SIGTERM},
+		},
+		unistd::Pid,
+	};
+
+	fn run_command_and_kill(signal: Signal) {
+		let _ = fs::remove_dir_all("interrupt_test");
+		let mut cmd = Command::new(cargo_bin("rococo-collator"))
+			.args(&["-d", "interrupt_test", "--", "--dev"])
+			.spawn()
+			.unwrap();
+
+		thread::sleep(Duration::from_secs(30));
+		assert!(
+			cmd.try_wait().unwrap().is_none(),
+			"the process should still be running"
+		);
+		kill(Pid::from_raw(cmd.id().try_into().unwrap()), signal).unwrap();
+		assert_eq!(
+			common::wait_for(&mut cmd, 30).map(|x| x.success()),
+			Some(true),
+			"the process must exit gracefully after signal {}",
+			signal,
+		);
+	}
+
+	run_command_and_kill(SIGINT);
+	run_command_and_kill(SIGTERM);
+}