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/purge_chain_works.rs

@@ -0,0 +1,64 @@
+// 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, path::PathBuf, process::Command, thread, time::Duration};
+
+mod common;
+
+#[test]
+#[cfg(unix)]
+fn purge_chain_works() {
+	use nix::{
+		sys::signal::{kill, Signal::SIGINT},
+		unistd::Pid,
+	};
+
+	let base_path = "purge_chain_test";
+
+	let _ = fs::remove_dir_all(base_path);
+	let mut cmd = Command::new(cargo_bin("rococo-collator"))
+		.args(&["-d", base_path, "--", "--dev"])
+		.spawn()
+		.unwrap();
+
+	// Let it produce some blocks.
+	thread::sleep(Duration::from_secs(30));
+	assert!(
+		cmd.try_wait().unwrap().is_none(),
+		"the process should still be running"
+	);
+
+	// Stop the process
+	kill(Pid::from_raw(cmd.id().try_into().unwrap()), SIGINT).unwrap();
+	assert!(common::wait_for(&mut cmd, 30)
+		.map(|x| x.success())
+		.unwrap_or_default());
+
+	let status = Command::new(cargo_bin("rococo-collator"))
+		.args(&["purge-chain", "-d", base_path, "-y"])
+		.status()
+		.unwrap();
+	assert!(status.success());
+
+	// Make sure that the `parachain_local_testnet` chain folder exists, but the `db` is deleted.
+	assert!(PathBuf::from(base_path)
+		.join("chains/local_testnet/")
+		.exists());
+	assert!(!PathBuf::from(base_path)
+		.join("chains/local_testnet/db")
+		.exists());
+}