Late locking (experimental) (#530)

* Late locking (experimental)

* Error on fee change

* Improve comments

* Fix typo in comment

* Add late locking flag to CLI command

controller/tests/late_lock.rs

@@ -0,0 +1,163 @@
+// Copyright 2020 The Grin Developers
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Tests and experimentations with late locking
+#[macro_use]
+extern crate log;
+extern crate grin_wallet_controller as wallet;
+extern crate grin_wallet_impls as impls;
+extern crate grin_wallet_libwallet as libwallet;
+
+use self::libwallet::{InitTxArgs, Slate};
+use impls::test_framework::{self, LocalWalletClient};
+use std::sync::atomic::Ordering;
+use std::thread;
+use std::time::Duration;
+
+#[macro_use]
+mod common;
+use common::{clean_output_dir, create_wallet_proxy, setup};
+
+/// self send impl
+fn late_lock_test_impl(test_dir: &'static str) -> Result<(), libwallet::Error> {
+	// Create a new proxy to simulate server and wallet responses
+	let mut wallet_proxy = create_wallet_proxy(test_dir);
+	let chain = wallet_proxy.chain.clone();
+	let stopper = wallet_proxy.running.clone();
+
+	// Create a new wallet test client, and set its queues to communicate with the
+	// proxy
+	create_wallet_and_add!(
+		client1,
+		wallet1,
+		mask1_i,
+		test_dir,
+		"wallet1",
+		None,
+		&mut wallet_proxy,
+		false
+	);
+	let mask1 = (&mask1_i).as_ref();
+	create_wallet_and_add!(
+		client2,
+		wallet2,
+		mask2_i,
+		test_dir,
+		"wallet2",
+		None,
+		&mut wallet_proxy,
+		false
+	);
+	let mask2 = (&mask2_i).as_ref();
+
+	// Set the wallet proxy listener running
+	thread::spawn(move || {
+		if let Err(e) = wallet_proxy.run() {
+			error!("Wallet Proxy error: {}", e);
+		}
+	});
+
+	// add some accounts
+	wallet::controller::owner_single_use(Some(wallet1.clone()), mask1, None, |api, m| {
+		api.create_account_path(m, "mining")?;
+		api.create_account_path(m, "listener")?;
+		Ok(())
+	})?;
+
+	// add some accounts
+	wallet::controller::owner_single_use(Some(wallet2.clone()), mask2, None, |api, m| {
+		api.create_account_path(m, "account1")?;
+		api.create_account_path(m, "account2")?;
+		Ok(())
+	})?;
+
+	// Get some mining done
+	{
+		wallet_inst!(wallet1, w);
+		w.set_parent_key_id_by_name("mining")?;
+	}
+	{
+		wallet_inst!(wallet2, w);
+		w.set_parent_key_id_by_name("account1")?;
+	}
+
+	let bh = 10u64;
+	let _ =
+		test_framework::award_blocks_to_wallet(&chain, wallet1.clone(), mask1, bh as usize, false);
+
+	let mut slate = Slate::blank(2, false);
+	let amount = 60_000_000_000;
+
+	wallet::controller::owner_single_use(Some(wallet1.clone()), mask1, None, |sender_api, m| {
+		let args = InitTxArgs {
+			src_acct_name: Some("mining".to_owned()),
+			amount,
+			minimum_confirmations: 2,
+			max_outputs: 500,
+			num_change_outputs: 1,
+			selection_strategy_is_use_all: false,
+			late_lock: Some(true),
+			..Default::default()
+		};
+		let slate_i = sender_api.init_send_tx(m, args)?;
+		println!("S1 SLATE: {}", slate_i);
+		slate = client1.send_tx_slate_direct("wallet2", &slate_i)?;
+		println!("S2 SLATE: {}", slate);
+
+		// Note we don't call `tx_lock_outputs` on the sender side here,
+		// as the outputs will only be locked during finalization
+
+		slate = sender_api.finalize_tx(m, &slate)?;
+		println!("S3 SLATE: {}", slate);
+
+		Ok(())
+	})?;
+
+	let _ = test_framework::award_blocks_to_wallet(&chain, wallet1.clone(), mask1, 3, false);
+
+	// update/test contents of both accounts
+	wallet::controller::owner_single_use(Some(wallet1.clone()), mask1, None, |api, m| {
+		let (wallet1_refreshed, wallet_info) = api.retrieve_summary_info(m, true, 1)?;
+		assert!(wallet1_refreshed);
+		print!(
+			"Wallet 1 amount: {}",
+			wallet_info.amount_currently_spendable
+		);
+		Ok(())
+	})?;
+
+	wallet::controller::owner_single_use(Some(wallet2.clone()), mask2, None, |api, m| {
+		let (wallet2_refreshed, wallet_info) = api.retrieve_summary_info(m, true, 1)?;
+		assert!(wallet2_refreshed);
+		println!(
+			"Wallet 2 amount: {}",
+			wallet_info.amount_currently_spendable
+		);
+		Ok(())
+	})?;
+
+	// let logging finish
+	stopper.store(false, Ordering::Relaxed);
+	thread::sleep(Duration::from_millis(200));
+	Ok(())
+}
+
+#[test]
+fn late_lock() {
+	let test_dir = "test_output/late_lock";
+	setup(test_dir);
+	if let Err(e) = late_lock_test_impl(test_dir) {
+		panic!("Libwallet Error: {} - {}", e, e.backtrace().unwrap());
+	}
+	clean_output_dir(test_dir);
+}