Add a command to purge the relay chain only (#306)

* Add a command to purge the relay chain only

* WIP

* Update rococo-parachains/src/cli.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Move cli stuff to its own crate

* Copyright dates

* Test not working for some reason...

* WIP

* Revert "WIP"

This reverts commit f97cd63742c7df822e4a6e52a29db5e0f56b7bfa.

* Fix test to use provided relay chain

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Add hint about which database could not be purged

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

cumulus/Cargo.lock

@@ -1112,6 +1112,15 @@ dependencies = [
  "rand 0.7.3",
 ]
 
+[[package]]
+name = "cumulus-cli"
+version = "0.1.0"
+dependencies = [
+ "sc-cli",
+ "sc-service",
+ "structopt",
+]
+
 [[package]]
 name = "cumulus-client-collator"
 version = "0.1.0"
@@ -7077,6 +7086,7 @@ name = "rococo-collator"
 version = "0.1.0"
 dependencies = [
  "assert_cmd",
+ "cumulus-cli",
  "cumulus-client-collator",
  "cumulus-client-consensus-relay-chain",
  "cumulus-client-network",
@@ -7133,6 +7143,7 @@ dependencies = [
  "substrate-build-script-utils",
  "substrate-test-client",
  "substrate-test-runtime-client",
+ "tempfile",
  "tokio 0.2.24",
  "trie-root 0.15.2",
 ]

cumulus/Cargo.toml

 [workspace]
 members = [
+	"cli",
 	"client/consensus/common",
 	"client/consensus/relay-chain",
 	"client/network",

cumulus/cli/Cargo.toml

+[package]
+name = "cumulus-cli"
+version = "0.1.0"
+authors = ["Parity Technologies <admin@parity.io>"]
+edition = "2018"
+
+[dependencies]
+structopt = "0.3.3"
+
+# Substrate dependencies
+sc-cli = { git = "https://github.com/paritytech/substrate", branch = "master" }
+sc-service = { git = "https://github.com/paritytech/substrate", branch = "master" }

cumulus/cli/src/lib.rs

+// Copyright 2021 Parity Technologies (UK) Ltd.
+// This file is part of Cumulus.
+
+// Cumulus 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.
+
+// Cumulus 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 Cumulus.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Cumulus CLI library.
+
+#![warn(missing_docs)]
+
+use sc_cli;
+use std::{
+	fs,
+	io::{self, Write},
+};
+use structopt::StructOpt;
+
+/// The `purge-chain` command used to remove the whole chain: the parachain and the relaychain.
+#[derive(Debug, StructOpt)]
+pub struct PurgeChainCmd {
+	/// The base struct of the purge-chain command.
+	#[structopt(flatten)]
+	pub base: sc_cli::PurgeChainCmd,
+
+	/// Only delete the para chain database
+	#[structopt(long, aliases = &["para"])]
+	pub parachain: bool,
+
+	/// Only delete the relay chain database
+	#[structopt(long, aliases = &["relay"])]
+	pub relaychain: bool,
+}
+
+impl PurgeChainCmd {
+	/// Run the purge command
+	pub fn run(
+		&self,
+		para_config: sc_service::Configuration,
+		relay_config: sc_service::Configuration,
+	) -> sc_cli::Result<()> {
+		let databases = match (self.parachain, self.relaychain) {
+			(true, true) | (false, false) => vec![
+				("parachain", para_config.database),
+				("relaychain", relay_config.database),
+			],
+			(true, false) => vec![("parachain", para_config.database)],
+			(false, true) => vec![("relaychain", relay_config.database)],
+		};
+
+		let db_paths = databases
+			.iter()
+			.map(|(chain_label, database)| {
+				database.path().ok_or_else(|| sc_cli::Error::Input(format!(
+					"Cannot purge custom database implementation of: {}",
+					chain_label,
+				)))
+			})
+			.collect::<sc_cli::Result<Vec<_>>>()?;
+
+		if !self.base.yes {
+			for db_path in &db_paths {
+				println!("{}", db_path.display());
+			}
+			print!("Are you sure to remove? [y/N]: ");
+			io::stdout().flush().expect("failed to flush stdout");
+
+			let mut input = String::new();
+			io::stdin().read_line(&mut input)?;
+			let input = input.trim();
+
+			match input.chars().nth(0) {
+				Some('y') | Some('Y') => {}
+				_ => {
+					println!("Aborted");
+					return Ok(());
+				}
+			}
+		}
+
+		for db_path in &db_paths {
+			match fs::remove_dir_all(&db_path) {
+				Ok(_) => {
+					println!("{:?} removed.", &db_path);
+				}
+				Err(ref err) if err.kind() == io::ErrorKind::NotFound => {
+					eprintln!("{:?} did not exist.", &db_path);
+				}
+				Err(err) => return Err(err.into()),
+			}
+		}
+
+		Ok(())
+	}
+}
+
+impl sc_cli::CliConfiguration for PurgeChainCmd {
+	fn shared_params(&self) -> &sc_cli::SharedParams {
+		&self.base.shared_params
+	}
+
+	fn database_params(&self) -> Option<&sc_cli::DatabaseParams> {
+		Some(&self.base.database_params)
+	}
+}

cumulus/client/collator/src/lib.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/client/consensus/common/src/lib.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Cumulus is free software: you can redistribute it and/or modify

cumulus/client/consensus/relay-chain/src/import_queue.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Cumulus is free software: you can redistribute it and/or modify

cumulus/client/network/src/lib.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Polkadot.
 
 // Polkadot is free software: you can redistribute it and/or modify

cumulus/client/network/src/tests.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Polkadot.
 
 // Polkadot is free software: you can redistribute it and/or modify

cumulus/client/network/src/wait_on_relay_chain_block.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Polkadot.
 
 // Polkadot is free software: you can redistribute it and/or modify

cumulus/client/service/src/genesis.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Cumulus is free software: you can redistribute it and/or modify

cumulus/client/service/src/lib.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/pallets/parachain-system/src/validate_block/implementation.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Substrate.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/pallets/parachain-system/src/validate_block/mod.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Substrate.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/pallets/parachain-system/src/validate_block/tests.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Substrate.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/pallets/xcm-handler/src/lib.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/primitives/core/src/lib.rs

-// Copyright 2020 Parity Technologies (UK) Ltd.
+// Copyright 2020-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/rococo-parachains/Cargo.toml

@@ -56,6 +56,7 @@ sp-offchain = { git = "https://github.com/paritytech/substrate", branch = "maste
 jsonrpc-core = "15.1.0"
 
 # Cumulus dependencies
+cumulus-cli = { path = "../cli" }
 cumulus-client-consensus-relay-chain = { path = "../client/consensus/relay-chain" }
 cumulus-client-collator = { path = "../client/collator" }
 cumulus-client-service = { path = "../client/service" }
@@ -76,6 +77,7 @@ substrate-build-script-utils = { git = "https://github.com/paritytech/substrate"
 assert_cmd = "0.12"
 nix = "0.17"
 rand = "0.7.3"
+tempfile = "3.2.0"
 tokio = { version = "0.2.13", features = ["macros"] }
 
 # Polkadot dependencies

cumulus/rococo-parachains/build.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Substrate is free software: you can redistribute it and/or modify

cumulus/rococo-parachains/contracts-runtime/src/lib.rs

-// Copyright 2019 Parity Technologies (UK) Ltd.
+// Copyright 2019-2021 Parity Technologies (UK) Ltd.
 // This file is part of Cumulus.
 
 // Cumulus is free software: you can redistribute it and/or modify