grim/src/wallet/wallet.rs

// Copyright 2023 The Grim 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.

use crate::AppConfig;
use crate::node::{Node, NodeConfig};
use crate::tor::Tor;
use crate::wallet::seed::WalletSeed;
use crate::wallet::store::TxHeightStore;
use crate::wallet::types::{
	ConnectionMethod, PhraseMode, WalletAccount, WalletData, WalletInstance, WalletTask, WalletTx,
	WalletTxAction,
};
use crate::wallet::{ConnectionsConfig, Mnemonic, WalletConfig};

use chrono::Utc;
use futures::channel::oneshot;
use grin_api::{ApiServer, Router};
use grin_chain::SyncStatus;
use grin_keychain::{ExtKeychain, Keychain};
use grin_util::secp::SecretKey;
use grin_util::types::ZeroingString;
use grin_util::{Mutex, ToHex};
use grin_wallet_api::Owner;
use grin_wallet_controller::command::parse_slatepack;
use grin_wallet_controller::controller;
use grin_wallet_controller::controller::ForeignAPIHandlerV2;
use grin_wallet_impls::{DefaultLCProvider, DefaultWalletImpl, HTTPNodeClient};
use grin_wallet_libwallet::api_impl::owner::{
	cancel_tx, init_send_tx, retrieve_summary_info, retrieve_txs, verify_payment_proof,
};
use grin_wallet_libwallet::{
	Error, InitTxArgs, IssueInvoiceTxArgs, NodeClient, PaymentProof, Slate, SlateState,
	SlateVersion, SlatepackAddress, StatusMessage, StoredProofInfo, TxLogEntry, TxLogEntryType,
	VersionedSlate, WalletBackend, WalletInitStatus, WalletInst, WalletLCProvider, address,
};
use grin_wallet_util::OnionV3Address;
use log::{debug, error};
use num_bigint::BigInt;
use parking_lot::RwLock;
use rand::Rng;
use serde_json::{Value, json};
use std::fs::File;
use std::io::Write;
use std::net::{SocketAddr, TcpListener, ToSocketAddrs};
use std::path::PathBuf;
use std::str::FromStr;
use std::sync::atomic::{AtomicBool, AtomicI64, AtomicU8, Ordering};
use std::sync::mpsc::Sender;
use std::sync::{Arc, mpsc};
use std::thread::Thread;
use std::time::Duration;
use std::{fs, path, thread};
use tor_config::deps::Itertools;
use uuid::Uuid;

/// Contains wallet instance, configuration and state, handles wallet commands.
#[derive(Clone)]
pub struct Wallet {
	/// Wallet configuration.
	config: Arc<RwLock<WalletConfig>>,
	/// Wallet instance, initializing on wallet opening and clearing on wallet closing.
	instance: Arc<RwLock<Option<WalletInstance>>>,
	/// Connection of current wallet instance.
	connection: Arc<RwLock<ConnectionMethod>>,
	/// Keychain mask for API calls.
	keychain_mask: Arc<RwLock<Option<SecretKey>>>,

	/// Wallet Slatepack address to receive txs at transport.
	slatepack_address: Arc<RwLock<Option<String>>>,

	/// Wallet accounts.
	accounts: Arc<RwLock<Vec<WalletAccount>>>,
	/// Timestamp when wallet account was selected to form unique identifier for transport.
	account_time: Arc<AtomicI64>,

	/// Wallet sync thread.
	sync_thread: Arc<RwLock<Option<Thread>>>,
	/// Flag to check if wallet is syncing.
	syncing: Arc<AtomicBool>,
	/// Info loading progress in percents.
	info_sync_progress: Arc<AtomicU8>,
	/// Error on wallet loading.
	sync_error: Arc<AtomicBool>,
	/// Attempts amount to update wallet data.
	sync_attempts: Arc<AtomicU8>,

	/// Wallet data.
	data: Arc<RwLock<Option<WalletData>>>,
	/// Flag to check if wallet data was synced from node.
	from_node: Arc<AtomicBool>,
	/// Flag to check if more transactions need to be loaded.
	more_txs_loading: Arc<AtomicBool>,

	/// Flag to check if wallet reopening is needed.
	reopen: Arc<AtomicBool>,
	/// Flag to check if wallet is open.
	is_open: Arc<AtomicBool>,
	/// Flag to check if wallet is closing.
	closing: Arc<AtomicBool>,
	/// Flag to check if wallet was deleted to remove it from the list.
	deleted: Arc<AtomicBool>,

	/// Running wallet foreign API server and port.
	foreign_api_server: Arc<RwLock<Option<(ApiServer, u16)>>>,

	/// Flag to check if wallet repairing and restoring missing outputs is needed.
	repair_needed: Arc<AtomicBool>,
	/// Wallet repair progress in percents.
	repair_progress: Arc<AtomicU8>,

	/// Flag to check if wallet files are moving.
	files_moving: Arc<AtomicBool>,

	/// Flag to check if Slatepack message file is opening.
	message_opening: Arc<AtomicBool>,

	/// Amount requests to calculate fee.
	fee_calculating: Arc<AtomicU8>,

	/// Flag to check if sending request is creating.
	send_creating: Arc<AtomicBool>,
	/// Flag to check if invoice is creating.
	invoice_creating: Arc<AtomicBool>,

	/// Amount requests to calculate fee.
	proof_verifying: Arc<AtomicBool>,

	/// Tasks sender.
	tasks_sender: Arc<RwLock<Option<Sender<WalletTask>>>>,
	/// Task result with optional transaction identifier.
	task_result: Arc<RwLock<Option<(Option<u32>, WalletTask)>>>,
}

impl Wallet {
	/// Create new [`Wallet`] instance with provided [`WalletConfig`].
	fn new(config: WalletConfig) -> Self {
		let connection = config.connection();
		Self {
			config: Arc::new(RwLock::new(config)),
			instance: Arc::new(RwLock::new(None)),
			connection: Arc::new(RwLock::new(connection)),
			keychain_mask: Arc::new(RwLock::new(None)),
			slatepack_address: Arc::new(RwLock::new(None)),
			accounts: Arc::new(RwLock::new(vec![])),
			account_time: Arc::new(Default::default()),
			sync_thread: Arc::from(RwLock::new(None)),
			syncing: Arc::new(AtomicBool::new(false)),
			info_sync_progress: Arc::from(AtomicU8::new(0)),
			sync_error: Arc::from(AtomicBool::new(false)),
			sync_attempts: Arc::new(AtomicU8::new(0)),
			data: Arc::new(RwLock::new(None)),
			from_node: Arc::new(AtomicBool::new(false)),
			more_txs_loading: Arc::new(AtomicBool::new(false)),
			reopen: Arc::new(AtomicBool::new(false)),
			is_open: Arc::from(AtomicBool::new(false)),
			closing: Arc::new(AtomicBool::new(false)),
			deleted: Arc::new(AtomicBool::new(false)),
			foreign_api_server: Arc::new(RwLock::new(None)),
			repair_needed: Arc::new(AtomicBool::new(false)),
			repair_progress: Arc::new(AtomicU8::new(0)),
			files_moving: Arc::new(AtomicBool::new(false)),
			message_opening: Arc::new(AtomicBool::from(false)),
			send_creating: Arc::new(AtomicBool::new(false)),
			fee_calculating: Arc::new(AtomicU8::new(0)),
			invoice_creating: Arc::new(AtomicBool::new(false)),
			proof_verifying: Arc::new(AtomicBool::new(false)),
			tasks_sender: Arc::new(RwLock::new(None)),
			task_result: Arc::new(RwLock::new(None)),
		}
	}

	/// Create new wallet.
	pub fn create(
		name: &String,
		password: &ZeroingString,
		mnemonic: &Mnemonic,
		conn_method: &ConnectionMethod,
	) -> Result<Wallet, Error> {
		let config = WalletConfig::create(name.clone(), conn_method);
		let w = Wallet::new(config.clone());
		{
			// Wallet directory setup.
			let mut path = PathBuf::from(config.get_data_path());
			path.push(WalletConfig::DATA_DIR_NAME);
			fs::create_dir_all(&path)
				.map_err(|_| Error::IO("Directory creation error".to_string()))?;
			// Create seed file.
			let _ = WalletSeed::init_file(
				config.seed_path().as_str(),
				ZeroingString::from(mnemonic.get_phrase()),
				password.clone(),
			)
			.map_err(|_| Error::IO("Seed file creation error".to_string()))?;
			let node_client = Self::create_node_client(&config)?;
			let mut wallet: WalletBackend<HTTPNodeClient, ExtKeychain> =
				match WalletBackend::new(path.to_str().unwrap(), node_client) {
					Err(_) => {
						return Err(Error::Lifecycle("DB creation error".to_string()).into());
					}
					Ok(d) => d,
				};
			// Save init status of this wallet, to determine whether it needs a full UTXO scan.
			let mut batch = wallet.batch_no_mask()?;
			match mnemonic.mode() {
				PhraseMode::Generate => batch.save_init_status(WalletInitStatus::InitNoScanning)?,
				PhraseMode::Import => {
					batch.save_init_status(WalletInitStatus::InitNeedsScanning)?
				}
			}
			batch.commit()?;
		}
		Ok(w)
	}

	/// Initialize [`Wallet`] from provided data path.
	pub fn init(data_path: PathBuf) -> Option<Wallet> {
		let wallet_config = WalletConfig::load(data_path);
		if let Some(config) = wallet_config {
			return Some(Wallet::new(config));
		}
		None
	}

	/// Create [`HTTPNodeClient`] from provided config.
	fn create_node_client(config: &WalletConfig) -> Result<HTTPNodeClient, Error> {
		let integrated = || {
			let (api_address, api_port) = NodeConfig::get_api_address();
			let api_url = format!("http://{}:{}", api_address, api_port);
			let api_secret = NodeConfig::get_api_secret(true);
			(api_url, api_secret)
		};
		let (node_api_url, node_secret) = if let Some(id) = config.ext_conn_id {
			if let Some(conn) = ConnectionsConfig::ext_conn(id) {
				(conn.url, conn.secret)
			} else {
				integrated()
			}
		} else {
			integrated()
		};
		let client = if AppConfig::use_proxy() {
			let socks = AppConfig::use_socks_proxy();
			let url = if socks {
				AppConfig::socks_proxy_url()
			} else {
				AppConfig::http_proxy_url()
			}
			.unwrap_or("".to_string())
			.replace("http://", "")
			.replace("socks5://", "");

			// Convert URL to SocketAddr.
			let addr_res = match SocketAddr::from_str(url.as_str()) {
				Ok(ip_addr) => Some(ip_addr),
				Err(_) => {
					if let Ok(mut socket_addr_list) = url.to_socket_addrs() {
						if let Some(addr) = socket_addr_list.next() {
							Some(addr)
						} else {
							None
						}
					} else {
						None
					}
				}
			};

			match addr_res {
				None => HTTPNodeClient::new(&node_api_url, node_secret)?,
				Some(addr) => {
					let scheme = if socks { "socks5://" } else { "http://" };
					HTTPNodeClient::new_proxy(&node_api_url, node_secret, Some((addr, scheme)))?
				}
			}
		} else {
			HTTPNodeClient::new(&node_api_url, node_secret)?
		};
		Ok(client)
	}

	/// Create [`WalletInstance`] from provided [`WalletConfig`].
	fn create_wallet_instance(config: &mut WalletConfig) -> Result<WalletInstance, Error> {
		// Setup node client.
		let node_client = Self::create_node_client(config)?;

		// Create wallet instance.
		let wallet = Self::inst_wallet::<
			DefaultLCProvider<HTTPNodeClient, ExtKeychain>,
			HTTPNodeClient,
			ExtKeychain,
		>(config, node_client)?;
		Ok(wallet)
	}

	/// Instantiate [`WalletInstance`] from provided node client and [`WalletConfig`].
	fn inst_wallet<L, C, K>(
		config: &mut WalletConfig,
		node_client: C,
	) -> Result<Arc<Mutex<Box<dyn WalletInst<'static, L, C, K>>>>, Error>
	where
		DefaultWalletImpl<C>: WalletInst<'static, L, C, K>,
		L: WalletLCProvider<'static, C, K>,
		C: NodeClient + 'static,
		K: Keychain + 'static,
	{
		let mut wallet = Box::new(DefaultWalletImpl::<C>::new(node_client).unwrap())
			as Box<dyn WalletInst<'static, L, C, K>>;
		let lc = wallet.lc_provider()?;
		lc.set_top_level_directory(config.get_data_path().as_str())?;
		Ok(Arc::new(Mutex::new(wallet)))
	}

	/// Open the wallet and start [`WalletData`] sync at separate thread.
	pub fn open(&self, password: ZeroingString) -> Result<(), Error> {
		if self.is_open() {
			return Err(Error::GenericError("Already opened".to_string()));
		}

		// Create new wallet instance if sync thread was stopped or instance was not created.
		let has_instance = {
			let r_inst = self.instance.as_ref().read();
			r_inst.is_some()
		};
		if self.sync_thread.read().is_none() || !has_instance {
			let mut config = self.get_config();
			// Setup current connection.
			{
				let mut w_conn = self.connection.write();
				*w_conn = config.connection();
			}
			let new_instance = Self::create_wallet_instance(&mut config)?;
			let mut w_inst = self.instance.write();
			*w_inst = Some(new_instance);
		}

		// Open the wallet.
		{
			let instance = {
				let r_inst = self.instance.as_ref().read();
				r_inst.clone().unwrap()
			};
			let mut wallet_lock = instance.lock();
			let lc = wallet_lock.lc_provider()?;
			match lc.open_wallet(None, password, true, false) {
				Ok(m) => {
					{
						let mut w_mask = self.keychain_mask.write();
						*w_mask = m;
					}
					// Reset an error on opening.
					self.set_sync_error(false);
					self.reset_sync_attempts();

					// Set current account.
					let wallet_inst = lc.wallet_inst()?;
					let label = self.get_config().account.to_owned();
					wallet_inst.set_parent_key_id_by_name(label.as_str())?;
					self.account_time
						.store(Utc::now().timestamp(), Ordering::Relaxed);

					// Start new synchronization thread or wake up existing one.
					let mut thread_w = self.sync_thread.write();
					if thread_w.is_none() {
						let thread = start_sync(self.clone());
						*thread_w = Some(thread);
					} else {
						thread_w.clone().unwrap().unpark();
					}
					self.is_open.store(true, Ordering::Relaxed);
				}
				Err(e) => {
					if !self.syncing() {
						let mut w_inst = self.instance.write();
						*w_inst = None;
					}
					return Err(e);
				}
			}
		}

		// Update Slatepack address.
		self.update_slatepack_addr()?;

		Ok(())
	}

	/// Get keychain mask [`SecretKey`].
	pub fn keychain_mask(&self) -> Option<SecretKey> {
		let r_key = self.keychain_mask.read();
		r_key.clone()
	}

	/// Retrieve wallet Slatepack address for transport.
	fn update_slatepack_addr(&self) -> Result<(), Error> {
		let sec_key = self.retrieve_secret_key()?;
		let addr = SlatepackAddress::try_from(&sec_key)?;
		let mut w_address = self.slatepack_address.write();
		*w_address = Some(addr.to_string());
		Ok(())
	}

	/// Retrieve wallet [`SecretKey`] for transport.
	pub fn retrieve_secret_key(&self) -> Result<SecretKey, Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut w_lock = instance.lock();
		let lc = w_lock.lc_provider()?;
		let w_inst = lc.wallet_inst()?;
		let k = w_inst.keychain(self.keychain_mask().as_ref())?;
		let parent_key_id = w_inst.parent_key_id();
		let sec_key = address::address_from_derivation_path(&k, &parent_key_id, 0)
			.map_err(|e| Error::TorConfig(format!("{:?}", e)))?;
		Ok(sec_key)
	}

	/// Get unique opened wallet identifier, including current account.
	pub fn identifier(&self) -> String {
		let config = self.get_config();
		let account_ts = self.account_time.load(Ordering::Relaxed);
		format!("{}_{}_{}", config.id, config.account.to_hex(), account_ts)
	}

	/// Get Slatepack address to receive txs at transport.
	pub fn slatepack_address(&self) -> Option<String> {
		let r_address = self.slatepack_address.read();
		if r_address.is_some() {
			let addr = r_address.clone();
			return addr;
		}
		None
	}

	/// Get wallet config.
	pub fn get_config(&self) -> WalletConfig {
		self.config.read().clone()
	}

	/// Change wallet name.
	pub fn change_name(&self, name: String) {
		let mut w_config = self.config.write();
		w_config.name = name;
		w_config.save();
	}

	/// Check if start of Tor listener on wallet opening is needed.
	pub fn auto_start_tor_listener(&self) -> bool {
		let r_config = self.config.read();
		r_config.enable_tor_listener.unwrap_or(true)
	}

	/// Update start of Tor listener on wallet opening.
	pub fn update_auto_start_tor_listener(&self, start: bool) {
		let mut w_config = self.config.write();
		w_config.enable_tor_listener = Some(start);
		w_config.save();
	}

	/// Check if Dandelion usage is needed to post transactions.
	pub fn can_use_dandelion(&self) -> bool {
		let r_config = self.config.read();
		r_config.use_dandelion.unwrap_or(true)
	}

	/// Update usage of Dandelion to post transactions.
	pub fn update_use_dandelion(&self, use_dandelion: bool) {
		let mut w_config = self.config.write();
		w_config.use_dandelion = Some(use_dandelion);
		w_config.save();
	}

	/// Update minimal amount of confirmations.
	pub fn update_min_confirmations(&self, min_confirmations: u64) {
		let mut w_config = self.config.write();
		w_config.min_confirmations = min_confirmations;
		w_config.save();
	}

	/// Get transaction broadcasting delay in blocks.
	pub fn broadcasting_delay(&self) -> u64 {
		let r_config = self.config.read();
		r_config
			.tx_broadcast_timeout
			.unwrap_or(WalletConfig::BROADCASTING_TIMEOUT_DEFAULT)
	}

	/// Update transaction broadcasting delay in blocks.
	pub fn update_broadcasting_delay(&self, delay: u64) {
		let mut w_config = self.config.write();
		w_config.tx_broadcast_timeout = Some(delay);
		w_config.save();
	}

	/// Update external connection identifier.
	pub fn update_connection(&self, conn: &ConnectionMethod) {
		let mut w_config = self.config.write();
		w_config.ext_conn_id = match conn {
			ConnectionMethod::Integrated => None,
			ConnectionMethod::External(id, _) => Some(id.clone()),
		};
		w_config.save();
	}

	/// Get external connection URL applied to [`WalletInstance`]
	/// after wallet opening if sync is running or get it from config.
	pub fn get_current_connection(&self) -> ConnectionMethod {
		if self.sync_thread.read().is_some() {
			let r_conn = self.connection.read();
			r_conn.clone()
		} else {
			let config = self.get_config();
			config.connection()
		}
	}

	/// Check if wallet is open.
	pub fn is_open(&self) -> bool {
		self.is_open.load(Ordering::Relaxed)
	}

	/// Check if wallet is closing.
	pub fn is_closing(&self) -> bool {
		self.closing.load(Ordering::Relaxed)
	}

	/// Close the wallet.
	pub fn close(&self) {
		let has_instance = {
			let r_inst = self.instance.read();
			r_inst.is_some()
		};
		if !self.is_open() || !has_instance {
			return;
		}
		// Stop repairing.
		if self.is_repairing() {
			self.repair_needed.store(false, Ordering::Relaxed);
		}
		// Close wallet at separate thread.
		let wallet_close = self.clone();
		let service_id = wallet_close.identifier();
		let conn = wallet_close.connection.clone();
		thread::spawn(move || {
			wallet_close.closing.store(true, Ordering::Relaxed);
			// Wait common operations to finish.
			while wallet_close.message_opening()
				|| wallet_close.send_creating()
				|| wallet_close.invoice_creating()
			{
				thread::sleep(Duration::from_millis(300));
			}
			// Stop running API server.
			let api_server_exists = { wallet_close.foreign_api_server.read().is_some() };
			if api_server_exists {
				let mut w_api_server = wallet_close.foreign_api_server.write();
				w_api_server.as_mut().unwrap().0.stop();
				*w_api_server = None;
			}
			// Stop running Tor service.
			Tor::stop_service(&service_id);
			// Close the wallet.
			let r_inst = wallet_close.instance.as_ref().read();
			let instance = r_inst.clone().unwrap();
			Self::close_wallet(&instance);
			wallet_close.closing.store(false, Ordering::Relaxed);
			wallet_close.is_open.store(false, Ordering::Relaxed);
			// Setup current connection.
			{
				let mut w_conn = conn.write();
				*w_conn = wallet_close.get_config().connection();
			}
			wallet_close.from_node.store(false, Ordering::Relaxed);
			// Start sync to exit from thread.
			wallet_close.sync();
		});
	}

	/// Close wallet for provided [`WalletInstance`].
	fn close_wallet(instance: &WalletInstance) {
		let mut wallet_lock = instance.lock();
		let lc = wallet_lock.lc_provider().unwrap();
		let _ = lc.close_wallet(None);
	}

	/// Set wallet reopen status.
	pub fn set_reopen(&self, reopen: bool) {
		self.reopen.store(reopen, Ordering::Relaxed);
	}

	/// Check if wallet reopen is needed.
	pub fn reopen_needed(&self) -> bool {
		self.reopen.load(Ordering::Relaxed)
	}

	/// Get wallet info synchronization progress.
	pub fn info_sync_progress(&self) -> u8 {
		self.info_sync_progress.load(Ordering::Relaxed)
	}

	/// Check if wallet had an error on synchronization.
	pub fn sync_error(&self) -> bool {
		self.sync_error.load(Ordering::Relaxed)
	}

	/// Set an error for wallet on synchronization.
	pub fn set_sync_error(&self, error: bool) {
		self.sync_error.store(error, Ordering::Relaxed);
	}

	/// Check if wallet was synced from node after opening.
	pub fn synced_from_node(&self) -> bool {
		self.from_node.load(Ordering::Relaxed)
	}

	/// Get current wallet synchronization attempts before setting an error.
	fn get_sync_attempts(&self) -> u8 {
		self.sync_attempts.load(Ordering::Relaxed)
	}

	/// Increment wallet synchronization attempts before setting an error.
	fn increment_sync_attempts(&self) {
		let mut attempts = self.get_sync_attempts();
		attempts += 1;
		self.sync_attempts.store(attempts, Ordering::Relaxed);
	}

	/// Reset wallet synchronization attempts.
	fn reset_sync_attempts(&self) {
		self.sync_attempts.store(0, Ordering::Relaxed);
	}

	/// Select transaction by slate id.
	fn retrieve_tx_by_id(&self, id: Option<u32>, slate_id: Option<Uuid>) -> Option<TxLogEntry> {
		let r_inst = self.instance.as_ref().read();
		let inst = r_inst.clone().unwrap();
		let mask = self.keychain_mask();
		if let Ok((_, txs)) = retrieve_txs(inst, mask.as_ref(), &None, false, id, slate_id, None) {
			if !txs.is_empty() {
				return Some(txs.get(0).unwrap().clone());
			}
		}
		None
	}

	/// Select transactions with provided limit.
	fn retrieve_txs(&self, limit: u32) -> Result<Vec<TxLogEntry>, Error> {
		let r_inst = self.instance.as_ref().read();
		let inst = r_inst.clone().unwrap();
		let mut wallet_lock = inst.lock();
		let lc = wallet_lock.lc_provider()?;
		let w = lc.wallet_inst()?;
		let parent_key_id = w.parent_key_id();
		// Retrieve txs from database.
		let txs: Vec<TxLogEntry> = w
			.tx_log_iter()?
			.filter(|tx| tx.is_ok())
			.map(|tx| tx.unwrap())
			.filter(|tx_entry| tx_entry.parent_key_id == parent_key_id)
			// Filter transactions to not show txs without slate (usually unspent outputs).
			.filter(|tx| {
				tx.tx_slate_id.is_some() || (tx.tx_slate_id.is_none() && tx.payment_proof.is_some())
			})
			.filter(|tx_entry| {
				if tx_entry.tx_type == TxLogEntryType::TxSent
					|| tx_entry.tx_type == TxLogEntryType::TxSentCancelled
				{
					BigInt::from(tx_entry.amount_debited) - BigInt::from(tx_entry.amount_credited)
						>= BigInt::from(1)
				} else {
					BigInt::from(tx_entry.amount_credited) - BigInt::from(tx_entry.amount_debited)
						>= BigInt::from(1)
				}
			})
			// Sort txs by creation date and confirmation status.
			.sorted_by_key(|tx| -tx.creation_ts.timestamp())
			// Sort to show unconfirmed at top.
			.sorted_by_key(|tx| {
				tx.confirmed
					|| tx.tx_type == TxLogEntryType::TxReceivedCancelled
					|| tx.tx_type == TxLogEntryType::TxSentCancelled
					|| tx.tx_type == TxLogEntryType::TxReverted
			})
			// Apply limit.
			.take(limit as usize)
			.collect();
		Ok(txs)
	}

	/// Delete txs with 0 amount.
	fn clear_empty_txs(&self) -> Result<(), Error> {
		let txs: Vec<TxLogEntry> = {
			let r_inst = self.instance.as_ref().read();
			let inst = r_inst.clone().unwrap();
			let mut wallet_lock = inst.lock();
			let lc = wallet_lock.lc_provider()?;
			let w = lc.wallet_inst()?;
			let parent_key_id = w.parent_key_id();
			// Retrieve txs from database.
			w.tx_log_iter()?
				.filter(|tx| tx.is_ok())
				.map(|tx| tx.unwrap())
				.filter(|tx_entry| tx_entry.parent_key_id == parent_key_id)
				.filter(|tx_entry| {
					if tx_entry.tx_type == TxLogEntryType::TxSent
						|| tx_entry.tx_type == TxLogEntryType::TxSentCancelled
					{
						BigInt::from(tx_entry.amount_debited)
							- BigInt::from(tx_entry.amount_credited)
							== BigInt::from(0)
					} else if tx_entry.tx_type == TxLogEntryType::TxReceived
						|| tx_entry.tx_type == TxLogEntryType::TxReceivedCancelled
					{
						BigInt::from(tx_entry.amount_credited)
							- BigInt::from(tx_entry.amount_debited)
							== BigInt::from(0)
					} else {
						false
					}
				})
				.collect()
		};
		for t in &txs {
			self.delete_tx(t.id)?;
		}
		Ok(())
	}

	/// Send a task to the wallet.
	pub fn task(&self, task: WalletTask) {
		let r_tasks = self.tasks_sender.read();
		if r_tasks.is_some() {
			match task {
				WalletTask::CalculateFee(_, _) => {
					let calculating = self.fee_calculating.load(Ordering::Relaxed);
					self.fee_calculating
						.store(calculating + 1, Ordering::Relaxed);
				}
				_ => {}
			}
			let _ = r_tasks.as_ref().unwrap().send(task);
		}
	}

	/// Create account into wallet.
	pub fn create_account(&self, label: &String) -> Result<(), Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		controller::owner_single_use(
			None,
			self.keychain_mask().as_ref(),
			Some(&mut api),
			|api, m| {
				let id = api.create_account_path(m, label)?;
				if self.get_data().is_none() {
					return Err(Error::GenericError("No wallet data".to_string()));
				}
				let current_height = self.get_data().unwrap().info.last_confirmed_height;
				if let Some(spendable_amount) = self.account_balance(current_height, api, m) {
					let mut w_data = self.accounts.write();
					w_data.push(WalletAccount {
						spendable_amount,
						label: label.clone(),
						path: id.to_bip_32_string(),
					});
					w_data.sort_by_key(|w| w.label != label.clone());
				}
				Ok(())
			},
		)
	}

	/// Set active account from provided label.
	pub fn set_active_account(&self, label: &String) -> Result<(), Error> {
		// Stop service from previous account.
		let cur_service_id = self.identifier();
		Tor::stop_service(&cur_service_id);

		// Set new active account.
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance.clone(), None);
		controller::owner_single_use(
			None,
			self.keychain_mask().as_ref(),
			Some(&mut api),
			|api, m| {
				api.set_active_account(m, label)?;
				self.account_time
					.store(Utc::now().timestamp(), Ordering::Relaxed);
				Ok(())
			},
		)?;

		// Update Slatepack address.
		self.update_slatepack_addr()?;

		// Save account label into config.
		let mut w_config = self.config.write();
		w_config.account = label.to_owned();
		w_config.save();

		// Clear wallet info.
		let mut w_data = self.data.write();
		*w_data = None;

		// Reset progress values.
		self.info_sync_progress.store(0, Ordering::Relaxed);

		// Sync wallet data.
		self.sync();
		Ok(())
	}

	/// Calculate current account balance.
	fn account_balance(
		&self,
		current_height: u64,
		o: &mut Owner<DefaultLCProvider<HTTPNodeClient, ExtKeychain>, HTTPNodeClient, ExtKeychain>,
		m: Option<&SecretKey>,
	) -> Option<u64> {
		if let Ok(outputs) = o.retrieve_outputs(m, false, false, None) {
			let mut spendable = 0;
			let min_confirmations = self.get_config().min_confirmations;
			for out_mapping in outputs.1 {
				let out = out_mapping.output;
				if out.status == grin_wallet_libwallet::OutputStatus::Unspent {
					if !out.is_coinbase
						|| out.lock_height <= current_height
						|| out.num_confirmations(current_height) >= min_confirmations
					{
						spendable += out.value;
					}
				}
			}
			return Some(spendable);
		}
		None
	}

	/// Get list of accounts for the wallet.
	pub fn accounts(&self) -> Vec<WalletAccount> {
		self.accounts.read().clone()
	}

	/// Get wallet data.
	pub fn get_data(&self) -> Option<WalletData> {
		let r_data = self.data.read();
		r_data.clone()
	}

	/// Load more transactions at list by increasing limit.
	pub fn load_more_txs(&self) {
		self.more_txs_loading.store(true, Ordering::Relaxed);
		let wallet = self.clone();
		thread::spawn(move || {
			// Wait when current sync will be finished.
			while wallet.syncing() {
				thread::sleep(Duration::from_secs(1));
			}
			// Sync wallet data with new limit.
			{
				let mut w_data = wallet.data.write();
				if w_data.is_some() {
					w_data.as_mut().unwrap().txs_limit += WalletData::TXS_LIMIT;
				}
			}
			sync_wallet_data(&wallet, false);
			wallet.more_txs_loading.store(false, Ordering::Relaxed);
		});
	}

	/// Check if more transaction are loading.
	pub fn more_txs_loading(&self) -> bool {
		self.more_txs_loading.load(Ordering::Relaxed)
	}

	/// Sync wallet data from node at sync thread or locally synchronously.
	pub fn sync(&self) {
		let thread_r = self.sync_thread.read();
		if let Some(thread) = thread_r.as_ref() {
			thread.unpark();
		}
	}

	/// Check if wallet is syncing.
	pub fn syncing(&self) -> bool {
		self.syncing.load(Ordering::Relaxed)
	}

	/// Get running Foreign API server port.
	pub fn foreign_api_port(&self) -> Option<u16> {
		let r_api = self.foreign_api_server.read();
		if r_api.is_some() {
			let api = r_api.as_ref().unwrap();
			return Some(api.1);
		}
		None
	}

	/// Check if Slatepack message is opening.
	pub fn message_opening(&self) -> bool {
		self.message_opening.load(Ordering::Relaxed)
	}

	/// Parse Slatepack message into [`Slate`].
	pub fn parse_slatepack(
		&self,
		text: &String,
	) -> Result<(Slate, Option<SlatepackAddress>), grin_wallet_controller::Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		match parse_slatepack(
			&mut api,
			self.keychain_mask().as_ref(),
			None,
			Some(text.trim().to_string()),
		) {
			Ok(s) => Ok(s),
			Err(e) => Err(e),
		}
	}

	/// Create Slatepack message from provided slate.
	fn create_slatepack_message(
		&self,
		slate: &Slate,
		address: Option<SlatepackAddress>,
	) -> Result<String, Error> {
		let mut message = "".to_string();
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		controller::owner_single_use(
			None,
			self.keychain_mask().as_ref(),
			Some(&mut api),
			|api, m| {
				let addrs = match address {
					Some(a) => vec![a],
					None => vec![],
				};
				message = api.create_slatepack_message(m, &slate, Some(0), addrs)?;
				Ok(())
			},
		)?;

		// Write Slatepack message to file.
		let slatepack_dir = self.get_config().get_slate_path(slate.id, &slate.state);
		let mut output = File::create(slatepack_dir)?;
		output.write_all(message.as_bytes())?;
		output.sync_all()?;
		Ok(message)
	}

	/// Check if Slatepack file exists.
	pub fn slatepack_exists(&self, slate: &Slate) -> bool {
		let slatepack_path = self.get_config().get_slate_path(slate.id, &slate.state);
		fs::exists(slatepack_path).unwrap_or(false)
	}

	/// Calculate transaction fee for provided amount.
	fn calculate_fee(&self, a: u64) -> Result<u64, Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut w_lock = instance.lock();
		let w = w_lock.lc_provider()?.wallet_inst()?;
		let config = self.get_config();
		let args = InitTxArgs {
			src_acct_name: Some(config.account.clone()),
			amount: a,
			minimum_confirmations: config.min_confirmations,
			num_change_outputs: 1,
			selection_strategy_is_use_all: false,
			estimate_only: Some(true),
			..Default::default()
		};
		let res = init_send_tx(w, self.keychain_mask().as_ref(), args, false);
		match res {
			Ok(slate) => Ok(slate.fee_fields.fee()),
			Err(e) => match e {
				Error::NotEnoughFunds {
					available, needed, ..
				} => Ok(needed - available),
				e => Err(e),
			},
		}
	}

	/// Check if transaction fee is calculating.
	pub fn fee_calculating(&self) -> bool {
		self.fee_calculating.load(Ordering::Relaxed) > 0
	}

	/// Initialize a transaction to send amount.
	fn send(&self, a: u64, dest: Option<SlatepackAddress>) -> Result<Slate, Error> {
		let config = self.get_config();
		let args = InitTxArgs {
			payment_proof_recipient_address: dest.clone(),
			src_acct_name: Some(config.account),
			amount: a,
			minimum_confirmations: config.min_confirmations,
			num_change_outputs: 1,
			selection_strategy_is_use_all: false,
			..Default::default()
		};
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		let mut slate = None;
		let keychain_mask = self.keychain_mask();
		controller::owner_single_use(None, keychain_mask.as_ref(), Some(&mut api), |api, m| {
			let s = api.init_send_tx(m, args)?;
			// Create Slatepack message response.
			let _ = self.create_slatepack_message(&s, None)?;
			// Lock outputs to for this transaction.
			api.tx_lock_outputs(m, &s)?;
			slate = Some(s);
			Ok(())
		})?;
		if let Some(slate) = slate {
			Ok(slate)
		} else {
			Err(Error::GenericError("slate was not created".to_string()))
		}
	}

	/// Send slate to Tor address.
	async fn send_tor(&self, id: u32, s: &Slate, addr: &SlatepackAddress) -> Result<Slate, Error> {
		self.on_tx_action(id, Some(WalletTxAction::SendingTor));

		let tor_addr = OnionV3Address::try_from(addr).unwrap().to_http_str();
		let url = format!("{}/v2/foreign", tor_addr);
		let slate_send = VersionedSlate::into_version(s.clone(), SlateVersion::V4)?;
		let body = json!({
			"jsonrpc": "2.0",
			"method": "receive_tx",
			"id": 1,
			"params": [
						slate_send,
						null,
						null
					]
		})
		.to_string();
		// Wait Tor service to launch.
		while Tor::is_service_starting(&self.identifier()) {
			tokio::time::sleep(Duration::from_secs(1)).await;
		}
		// Send request to receiver.
		let req_res = Tor::post(body, url).await;
		if req_res.is_none() {
			return Err(Error::GenericError("Tor request error".to_string()));
		}

		// Parse response.
		if let Ok(res) = serde_json::from_str::<Value>(&req_res.unwrap()) {
			if res["error"] != json!(null) {
				return Err(Error::GenericError("Response error".to_string()));
			}
			let slate_value = res["result"]["Ok"].clone();
			if let Ok(res) = &serde_json::to_string::<Value>(&slate_value) {
				let res = Slate::deserialize_upgrade(res);
				return res;
			}
		}
		Err(Error::GenericError("Parse error".to_string()))
	}

	/// Check if request to send funds is creating.
	pub fn send_creating(&self) -> bool {
		self.send_creating.load(Ordering::Relaxed)
	}

	/// Initialize an invoice transaction to receive amount, return request for funds sender.
	fn issue_invoice(
		&self,
		amount: u64,
		address: Option<SlatepackAddress>,
	) -> Result<Slate, Error> {
		let args = IssueInvoiceTxArgs {
			dest_acct_name: None,
			amount,
			target_slate_version: None,
		};
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let api = Owner::new(instance, None);
		let slate = api.issue_invoice_tx(self.keychain_mask().as_ref(), args)?;

		// Create Slatepack message response.
		let _ = self.create_slatepack_message(&slate, address)?;

		Ok(slate)
	}

	/// Handle message from the invoice issuer to send founds, return response for funds receiver.
	fn pay(&self, slate: &Slate) -> Result<Slate, Error> {
		let config = self.get_config();
		let args = InitTxArgs {
			src_acct_name: None,
			amount: slate.amount,
			minimum_confirmations: config.min_confirmations,
			selection_strategy_is_use_all: false,
			..Default::default()
		};
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let api = Owner::new(instance, None);
		let slate = api.process_invoice_tx(self.keychain_mask().as_ref(), &slate, args)?;
		api.tx_lock_outputs(self.keychain_mask().as_ref(), &slate)?;

		// Create Slatepack message response.
		let _ = self.create_slatepack_message(&slate, None)?;

		Ok(slate)
	}

	/// Check if request to receive funds is creating.
	pub fn invoice_creating(&self) -> bool {
		self.invoice_creating.load(Ordering::Relaxed)
	}

	/// Create response to sender to receive funds.
	fn receive(&self, slate: &Slate, dest: Option<SlatepackAddress>) -> Result<Slate, Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let api = Owner::new(instance, None);
		let mut slate = slate.clone();
		controller::foreign_single_use(api.wallet_inst.clone(), self.keychain_mask(), |api| {
			slate = api.receive_tx(&slate, Some(self.get_config().account.as_str()), None)?;
			Ok(())
		})?;

		// Create Slatepack message response.
		let _ = self.create_slatepack_message(&slate, dest)?;

		Ok(slate)
	}

	/// Finalize transaction from provided message as sender or invoice issuer.
	fn finalize(&self, slate: &Slate, id: u32) -> Result<Slate, Error> {
		self.on_tx_action(id, Some(WalletTxAction::Finalizing));

		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let api = Owner::new(instance, None);
		let mut slate = slate.clone();
		controller::foreign_single_use(api.wallet_inst.clone(), self.keychain_mask(), |api| {
			slate = api.finalize_tx(&slate, false)?;
			Ok(())
		})?;

		// Save Slatepack message to file.
		let _ = self.create_slatepack_message(&slate, None)?;

		// Clear tx action.
		self.on_tx_action(id, None);

		Ok(slate)
	}

	/// Post transaction to blockchain.
	fn post(&self, slate: &Slate, id: Option<u32>) -> Result<(), Error> {
		if let Some(id) = id {
			self.on_tx_action(id, Some(WalletTxAction::Posting));
		}

		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		controller::owner_single_use(
			None,
			self.keychain_mask().as_ref(),
			Some(&mut api),
			|api, m| {
				api.post_tx(m, &slate, self.can_use_dandelion())?;
				Ok(())
			},
		)?;

		// Clear tx action.
		if let Some(id) = id {
			self.on_tx_action(id, None);
		}
		Ok(())
	}

	/// Cancel transaction.
	fn cancel(&self, id: u32) -> Result<(), Error> {
		self.on_tx_action(id, Some(WalletTxAction::Cancelling));

		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		cancel_tx(
			instance,
			self.keychain_mask().as_ref(),
			&None,
			Some(id),
			None,
		)?;

		// Clear tx action.
		self.on_tx_action(id, None);

		Ok(())
	}

	/// Update transaction action status.
	fn on_tx_action(&self, id: u32, action: Option<WalletTxAction>) {
		let mut w_data = self.data.write();
		if let Some(data) = w_data.as_mut() {
			data.on_tx_action(id, action);
		}
	}

	/// Update transaction action error status.
	fn on_tx_error(&self, id: u32, err: Option<Error>) {
		let mut w_data = self.data.write();
		if let Some(data) = w_data.as_mut() {
			data.on_tx_error(id, err);
		}
	}

	/// Save task result to consume later.
	fn on_task_result(&self, tx: Option<TxLogEntry>, task: &WalletTask) {
		let mut w_res = self.task_result.write();
		let id = if let Some(t) = tx { Some(t.id) } else { None };
		*w_res = Some((id, task.clone()));
	}

	/// Consume result of successful task.
	pub fn consume_task_result(&self) -> Option<(Option<u32>, WalletTask)> {
		let res = {
			let r_res = self.task_result.read();
			r_res.clone()
		};
		// Clear result for task.
		let mut w_res = self.task_result.write();
		*w_res = None;
		res
	}

	/// Get possible transaction confirmation height.
	fn tx_height(&self, tx: &WalletTx) -> Result<Option<u64>, Error> {
		let mut tx_height = None;
		if tx.data.confirmed && tx.data.kernel_excess.is_some() {
			let r_inst = self.instance.as_ref().read();
			let instance = r_inst.clone().unwrap();
			let mut w_lock = instance.lock();
			let w = w_lock.lc_provider()?.wallet_inst()?;
			if let Ok(res) = w.w2n_client().get_kernel(
				tx.data.kernel_excess.as_ref().unwrap(),
				tx.data.kernel_lookup_min_height,
				None,
			) {
				tx_height = Some(match res {
					None => 0,
					Some((_, h, _)) => h,
				});
			}
		} else if tx.broadcasting() {
			tx_height = match self.get_data() {
				None => None,
				Some(data) => Some(data.info.last_confirmed_height),
			};
		}
		Ok(tx_height)
	}

	/// Get stored transaction Slate.
	fn get_tx_slate(&self, tx_id: u32) -> Option<Slate> {
		if let Some(tx) = self.retrieve_tx_by_id(Some(tx_id), None) {
			if let Some(slate_id) = tx.tx_slate_id {
				if let Some(slate_state) = tx.tx_slate_state {
					let slatepack_path = self.get_config().get_slate_path(slate_id, &slate_state);
					let msg = fs::read_to_string(slatepack_path).unwrap_or("".to_string());
					if let Ok((slate, _)) = self.parse_slatepack(&msg) {
						return Some(slate);
					}
				}
			}
		}
		None
	}

	/// Delete transaction from database.
	fn delete_tx(&self, id: u32) -> Result<(), Error> {
		self.on_tx_action(id, Some(WalletTxAction::Deleting));

		let slate = self.get_tx_slate(id);
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let keychain_mask = self.keychain_mask();
		let mut wallet_lock = instance.lock();
		let lc = wallet_lock.lc_provider()?;
		let w = lc.wallet_inst()?;
		let parent_key = w.parent_key_id();
		let mut batch = w.batch(keychain_mask.as_ref())?;
		batch.delete_tx_log_entry(id, &parent_key)?;
		batch.commit()?;

		// Delete transaction files.
		if let Some(s) = slate {
			let slatepack_path = self.get_config().get_slate_path(s.id, &s.state);
			fs::remove_file(&slatepack_path).unwrap_or_default();
			let path = path::Path::new(&self.get_config().get_data_path())
				.join("saved_txs")
				.join(format!("{}.grintx", s.id));
			fs::remove_file(&path).unwrap_or_default();
		}
		Ok(())
	}

	/// Change wallet password.
	pub fn change_password(&self, old: String, new: String) -> Result<(), Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut wallet_lock = instance.lock();
		let lc = wallet_lock.lc_provider()?;
		lc.change_password(None, ZeroingString::from(old), ZeroingString::from(new))
	}

	/// Initiate wallet repair by scanning its outputs.
	pub fn repair(&self) {
		self.repair_needed.store(true, Ordering::Relaxed);
		self.sync();
	}

	/// Check if wallet is repairing.
	pub fn is_repairing(&self) -> bool {
		self.repair_needed.load(Ordering::Relaxed)
	}

	/// Get wallet repairing progress.
	pub fn repairing_progress(&self) -> u8 {
		self.repair_progress.load(Ordering::Relaxed)
	}

	/// Change wallet data path, migrating all files to new directory.
	pub fn change_data_path(&self, path: String) {
		let wallet = self.clone();
		wallet.files_moving.store(true, Ordering::Relaxed);
		// Close wallet if open.
		if self.is_open() {
			self.close();
		}
		thread::spawn(move || {
			// Wait wallet to be closed.
			while wallet.is_open() || wallet.syncing() {
				thread::sleep(Duration::from_millis(100));
			}
			// Move wallet db files.
			if let Some(old_path) = wallet.get_config().data_path {
				let mut old = PathBuf::from(old_path.as_str());
				old.push(WalletConfig::DATA_DIR_NAME);
				let mut new = PathBuf::from(path.as_str());
				new.push(WalletConfig::DATA_DIR_NAME);
				if old.exists() {
					fs::create_dir_all(&new).unwrap_or_default();
					if let Ok(_) = fs::rename(old.as_path(), new.as_path()) {
						// Save new path to config.
						let mut w_config = wallet.config.write();
						w_config.data_path = Some(path);
						w_config.save();
					}
				}
			}
			wallet.files_moving.store(false, Ordering::Relaxed);
			// Mark wallet to reopen.
			if !wallet.is_open() {
				wallet.set_reopen(true);
			}
		});
	}

	/// Deleting wallet database files.
	pub fn delete_db(&self) {
		let wallet = self.clone();
		wallet.files_moving.store(true, Ordering::Relaxed);
		// Close wallet if open.
		if self.is_open() {
			self.close();
		}
		thread::spawn(move || {
			// Wait wallet to be closed.
			while wallet.is_open() || wallet.syncing() {
				thread::sleep(Duration::from_millis(100));
			}
			// Remove wallet db files.
			let _ = fs::remove_dir_all(wallet.get_config().get_db_path());
			wallet.files_moving.store(false, Ordering::Relaxed);
			// Mark wallet to repair.
			wallet.repair();
			// Mark wallet to reopen.
			if !wallet.is_open() {
				wallet.set_reopen(true);
			}
		});
	}

	/// Check if data files are moving.
	pub fn files_moving(&self) -> bool {
		self.files_moving.load(Ordering::Relaxed)
	}

	/// Retrieve payment proof.
	pub fn get_payment_proof(
		&self,
		tx_id: Option<u32>,
		slate_id: Option<Uuid>,
	) -> Result<Option<PaymentProof>, Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let key_mask = self.keychain_mask();
		let mut api = Owner::new(instance, None);
		let mut proof = None;
		controller::owner_single_use(None, key_mask.as_ref(), Some(&mut api), |api, m| {
			let result = api.retrieve_payment_proof(m, false, tx_id, slate_id);
			proof = match result {
				Ok(p) => Some(p),
				Err(e) => {
					error!("retrieve_payment_proof error: {}", e);
					None
				}
			};
			Ok(())
		})?;
		Ok(proof)
	}

	/// Verify payment proof.
	fn verify_payment_proof(&self, proof: &PaymentProof) -> Result<(u32, bool, bool), Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let keychain_mask = self.keychain_mask();
		let verify_res = verify_payment_proof(instance.clone(), keychain_mask.as_ref(), proof);
		let res = match verify_res {
			Ok((send, rec)) => {
				// Update proof at local database for valid proof.
				if send || rec {
					let mut wallet_lock = instance.lock();
					let lc = wallet_lock.lc_provider()?;
					let w = lc.wallet_inst()?;
					// Find wallet transaction to update or create.
					let txs = w
						.tx_log_iter()?
						.filter(|tx| tx.is_ok())
						.map(|tx| tx.unwrap())
						.filter(|entry| {
							if let Some(excess) = entry.kernel_excess {
								return excess == proof.excess;
							}
							false
						})
						.collect::<Vec<TxLogEntry>>();
					if let Some(tx) = txs.get(0) {
						let mut tx = tx.clone();
						let mut batch = w.batch(keychain_mask.as_ref())?;
						let parent_key = &tx.parent_key_id;
						tx.payment_proof = Some(StoredProofInfo {
							receiver_address: proof.recipient_address.pub_key,
							receiver_signature: Some(proof.recipient_sig),
							sender_address_path: 0,
							sender_address: proof.sender_address.pub_key,
							sender_signature: Some(proof.sender_sig),
						});
						batch.save_tx_log_entry(tx.clone(), &parent_key)?;
						batch.commit()?;
						Ok((tx.id, send, rec))
					} else {
						let parent_key = w.parent_key_id();
						let mut batch = w.batch(keychain_mask.as_ref())?;
						let log_id = batch.next_tx_log_id(&parent_key)?;
						let log_type = TxLogEntryType::TxSent;
						let mut tx = TxLogEntry::new(parent_key.clone(), log_type, log_id);
						tx.amount_debited = proof.amount;
						tx.kernel_excess = Some(proof.excess);
						tx.tx_type = TxLogEntryType::TxSent;
						tx.confirmed = true;
						tx.payment_proof = Some(StoredProofInfo {
							receiver_address: proof.recipient_address.pub_key,
							receiver_signature: Some(proof.recipient_sig),
							sender_address_path: 0,
							sender_address: proof.sender_address.pub_key,
							sender_signature: Some(proof.sender_sig),
						});
						batch.save_tx_log_entry(tx.clone(), &parent_key)?;
						batch.commit()?;
						Ok((tx.id, send, rec))
					}
				} else {
					Ok((0, send, rec))
				}
			}
			Err(e) => Err(e),
		};
		// Sync wallet data on success.
		if res.is_ok() {
			sync_wallet_data(self, false);
		}
		res
	}

	/// Check if payment proof is verifying.
	pub fn payment_proof_verifying(&self) -> bool {
		self.proof_verifying.load(Ordering::Relaxed)
	}

	/// Get recovery phrase.
	pub fn get_recovery(&self, password: String) -> Result<ZeroingString, Error> {
		let r_inst = self.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut wallet_lock = instance.lock();
		let lc = wallet_lock.lc_provider()?;
		lc.get_mnemonic(None, ZeroingString::from(password))
	}

	/// Close the wallet, delete its files and mark it as deleted.
	pub fn delete_wallet(&self) {
		if self.is_open() {
			self.close();
		}
		// Mark wallet as deleted.
		let wallet_delete = self.clone();
		wallet_delete.deleted.store(true, Ordering::Relaxed);

		thread::spawn(move || {
			// Wait wallet to be closed.
			if wallet_delete.is_open() {
				thread::sleep(Duration::from_millis(100));
			}
			// Remove wallet files.
			let _ = fs::remove_dir_all(wallet_delete.get_config().get_wallet_path());
			// Mark wallet as deleted.
			wallet_delete.deleted.store(true, Ordering::Relaxed);
			// Start sync to close thread.
			wallet_delete.sync();
		});
	}

	/// Check if wallet was deleted to remove it from list.
	pub fn is_deleted(&self) -> bool {
		self.deleted.load(Ordering::Relaxed)
	}
}

/// Delay in seconds to sync [`WalletData`] (60 seconds as average block time).
const SYNC_DELAY: Duration = Duration::from_millis(60 * 1000);
/// Delay in seconds for sync thread to wait before start of new attempt.
const ATTEMPT_DELAY: Duration = Duration::from_millis(3 * 1000);
/// Number of attempts to sync [`WalletData`] before setting an error.
const SYNC_ATTEMPTS: u8 = 10;

/// Launch thread to sync wallet data from node.
fn start_sync(wallet: Wallet) -> Thread {
	// Start tasks thread.
	let (tx, rx) = mpsc::channel();
	{
		let mut w_tasks = wallet.tasks_sender.write();
		*w_tasks = Some(tx);
	}
	let wallet_thread = wallet.clone();
	thread::spawn(move || {
		loop {
			let wallet_task = wallet_thread.clone();
			if let Ok(task) = rx.recv() {
				thread::spawn(move || {
					tokio::runtime::Builder::new_current_thread()
						.enable_all()
						.build()
						.unwrap()
						.block_on(async {
							handle_task(&wallet_task, task).await;
						});
				});
			}
			if wallet_thread.is_closing() || !wallet_thread.is_open() {
				break;
			}
		}
	});

	// Reset progress values.
	wallet.info_sync_progress.store(0, Ordering::Relaxed);
	wallet.repair_progress.store(0, Ordering::Relaxed);

	// To call on sync thread stop.
	let on_thread_stop = |wallet: Wallet| {
		// Clear thread instance.
		let mut thread_w = wallet.sync_thread.write();
		*thread_w = None;

		// Clear wallet info.
		let mut w_data = wallet.data.write();
		*w_data = None;

		// Clear syncing status.
		wallet.syncing.store(false, Ordering::Relaxed);
	};

	thread::spawn(move || {
		loop {
			// Set syncing status.
			wallet.syncing.store(true, Ordering::Relaxed);

			// Close wallet on chain type change.
			if wallet.get_config().chain_type != AppConfig::chain_type() {
				wallet.close();
			}

			// Stop syncing if wallet was closed.
			if !wallet.is_open() || wallet.is_closing() {
				on_thread_stop(wallet);
				return;
			}

			// Check integrated node state.
			if wallet.get_current_connection() == ConnectionMethod::Integrated {
				let not_enabled = !Node::is_running() || Node::is_stopping();
				if not_enabled {
					// Reset loading progress.
					wallet.info_sync_progress.store(0, Ordering::Relaxed);
				}
				// Set an error when integrated node is not enabled.
				wallet.set_sync_error(not_enabled);
				// Skip cycle when node sync is not finished.
				if !Node::is_running() || Node::get_sync_status() != Some(SyncStatus::NoSync) {
					thread::park_timeout(ATTEMPT_DELAY);
					continue;
				}
			}

			// Scan outputs if repair is needed or sync data if there is no error.
			if !wallet.sync_error() {
				if wallet.is_repairing() {
					repair_wallet(&wallet);
					// Stop sync if wallet was closed.
					if !wallet.is_open() || wallet.is_closing() {
						on_thread_stop(wallet);
						return;
					}
				}
				// Retrieve data from local database if current data is empty.
				if wallet.get_data().is_none() {
					sync_wallet_data(&wallet, false);
				}

				if wallet.is_open() && !wallet.is_closing() {
					// Start Foreign API listener if not running.
					let mut api_server_running = { wallet.foreign_api_server.read().is_some() };
					if !api_server_running {
						match start_api_server(&wallet) {
							Ok(api_server) => {
								let mut api_server_w = wallet.foreign_api_server.write();
								*api_server_w = Some(api_server);
								api_server_running = true;
							}
							Err(_) => {}
						}
						// Start unfailed Tor service if API server is running.
						let service_id = wallet.identifier();
						if wallet.auto_start_tor_listener()
							&& api_server_running && !Tor::is_service_failed(&service_id)
						{
							let r_foreign_api = wallet.foreign_api_server.read();
							let api = r_foreign_api.as_ref().unwrap();
							Tor::start_service(api.1, Some(&wallet), &service_id);
						}
					}
				}

				// Sync wallet from node.
				sync_wallet_data(&wallet, true);
			}

			// Stop sync if wallet was closed.
			if !wallet.is_open() || wallet.is_closing() {
				on_thread_stop(wallet);
				return;
			}

			// Setup flag to check if sync was failed.
			let failed_sync = wallet.sync_error() || wallet.get_sync_attempts() != 0;

			// Clear syncing status.
			if !failed_sync {
				wallet.syncing.store(false, Ordering::Relaxed);
			}

			// Repeat after default or attempt delay if synchronization was not successful.
			let delay = if failed_sync {
				ATTEMPT_DELAY
			} else {
				SYNC_DELAY
			};
			thread::park_timeout(delay);
		}
	})
	.thread()
	.clone()
}

/// Handle wallet task.
async fn handle_task(w: &Wallet, t: WalletTask) {
	let send_tor = async |tx: TxLogEntry, s: &Slate, r: &SlatepackAddress| match w
		.send_tor(tx.id, &s, r)
		.await
	{
		Ok(s) => match w.finalize(&s, tx.id) {
			Ok(s) => match w.post(&s, Some(tx.id)) {
				Ok(_) => {
					sync_wallet_data(&w, false);
					w.on_task_result(Some(tx), &t);
				}
				Err(e) => {
					error!("send tor post error: {:?}", e);
					w.on_tx_error(tx.id, Some(e));
				}
			},
			Err(e) => {
				error!("send tor finalize error: {:?}", e);
				w.task(WalletTask::Cancel(tx.id));
			}
		},
		Err(e) => {
			error!("send tor error: {:?}", e);
			w.on_tx_error(tx.id, Some(e));
			w.on_task_result(Some(tx), &t);
		}
	};
	match &t {
		WalletTask::OpenMessage(m) => {
			if !w.is_open() || m.is_empty() {
				return;
			}
			let w = w.clone();
			let msg = m.clone();
			w.message_opening.store(true, Ordering::Relaxed);
			if let Ok((s, dest)) = w.parse_slatepack(&msg) {
				let tx = w.retrieve_tx_by_id(None, Some(s.id));
				// Check if message already exists.
				let exists = {
					let mut exists = w.slatepack_exists(&s);
					if !exists
						&& (s.state == SlateState::Invoice2 || s.state == SlateState::Standard2)
					{
						let mut slate = s.clone();
						slate.state = if s.state == SlateState::Standard2 {
							SlateState::Standard3
						} else {
							SlateState::Invoice3
						};
						exists = w.slatepack_exists(&slate);
					}
					exists
				};
				if exists {
					w.on_task_result(tx, &t);
					w.message_opening.store(false, Ordering::Relaxed);
					return;
				}
				// Create response or finalize.
				match s.state {
					SlateState::Standard1 | SlateState::Invoice1 => {
						if s.state != SlateState::Standard1 {
							if let Ok(_) = w.pay(&s) {
								sync_wallet_data(&w, false);
								let tx = w.retrieve_tx_by_id(None, Some(s.id));
								w.on_task_result(tx, &t);
							}
						} else {
							if let Ok(_) = w.receive(&s, dest) {
								sync_wallet_data(&w, false);
								let tx = w.retrieve_tx_by_id(None, Some(s.id));
								w.on_task_result(tx, &t);
							}
						}
					}
					SlateState::Standard2 | SlateState::Invoice2 => {
						if let Some(tx) = tx {
							match w.finalize(&s, tx.id) {
								Ok(s) => match w.post(&s, Some(tx.id)) {
									Ok(_) => {
										sync_wallet_data(&w, false);
									}
									Err(e) => {
										error!("message tx post error: {:?}", e);
										w.on_tx_error(tx.id, Some(e));
									}
								},
								Err(e) => {
									error!("message tx finalize error: {:?}", e);
									w.task(WalletTask::Cancel(tx.id));
								}
							}
						}
					}
					_ => {}
				};
			}
			w.message_opening.store(false, Ordering::Relaxed);
		}
		WalletTask::CalculateFee(a, _) => {
			// Wait if there are no more fee tasks or handle next input value.
			let calculating = w.fee_calculating.load(Ordering::Relaxed);
			if calculating == 1 {
				async_std::task::sleep(Duration::from_millis(100)).await;
				let calculating = w.fee_calculating.load(Ordering::Relaxed);
				if calculating > 1 {
					w.fee_calculating.store(calculating - 1, Ordering::Relaxed);
					return;
				}
			} else {
				w.fee_calculating.store(calculating - 1, Ordering::Relaxed);
				return;
			}
			// Calculate fee for provided amount.
			if let Ok(fee) = w.calculate_fee(*a) {
				w.on_task_result(None, &WalletTask::CalculateFee(*a, fee))
			}
			let calculating = w.fee_calculating.load(Ordering::Relaxed);
			w.fee_calculating.store(calculating - 1, Ordering::Relaxed);
		}
		WalletTask::Send(a, r) => {
			w.send_creating.store(true, Ordering::Relaxed);
			if let Ok(s) = w.send(*a, r.clone()) {
				sync_wallet_data(&w, false);
				let tx = w.retrieve_tx_by_id(None, Some(s.id));
				if let Some(tx) = tx {
					if let Some(addr) = r {
						let id = w.identifier();
						if Tor::is_service_running(&id) || Tor::is_service_starting(&id) {
							w.send_creating.store(false, Ordering::Relaxed);
							send_tor(tx, &s, addr).await;
							return;
						} else {
							w.on_task_result(Some(tx), &t);
						}
					} else {
						w.on_task_result(Some(tx), &t);
					}
				}
			}
			w.send_creating.store(false, Ordering::Relaxed);
		}
		WalletTask::SendTor(tx, r) => {
			if let Some(s) = w.get_tx_slate(tx.id) {
				send_tor(tx.clone(), &s, r).await;
			}
		}
		WalletTask::Receive(amount, address) => {
			w.invoice_creating.store(true, Ordering::Relaxed);
			debug!("receive: {} at {:?}", amount, address.clone());
			if let Ok(s) = w.issue_invoice(*amount, address.clone()) {
				sync_wallet_data(&w, false);
				let tx = w.retrieve_tx_by_id(None, Some(s.id));
				if let Some(tx) = tx {
					w.on_task_result(Some(tx), &t);
				}
			}
			w.invoice_creating.store(false, Ordering::Relaxed);
		}
		WalletTask::Finalize(id) => {
			if let Some(s) = w.get_tx_slate(*id) {
				w.on_tx_error(*id, None);
				match w.finalize(&s, *id) {
					Ok(s) => match w.post(&s, Some(*id)) {
						Ok(_) => {
							sync_wallet_data(&w, false);
						}
						Err(e) => {
							error!("tx finalize post error: {:?}", e);
							w.on_tx_error(*id, Some(e));
						}
					},
					Err(e) => {
						error!("tx finalize error: {:?}", e);
						w.task(WalletTask::Cancel(*id));
					}
				}
			} else {
				error!("tx finalize: slate not found");
				w.task(WalletTask::Cancel(*id));
			}
		}
		WalletTask::Post(id) => {
			if let Some(s) = w.get_tx_slate(*id) {
				w.on_tx_error(*id, None);
				// Cleanup broadcasting tx height.
				let tx_height_store = TxHeightStore::new(w.get_config().get_extra_db_path());
				tx_height_store.delete_broadcasting_height(&id.to_string());
				let has_data = {
					let r_data = w.data.read();
					r_data.is_some()
				};
				if has_data {
					let mut w_data = w.data.write();
					for tx in w_data.as_mut().unwrap().txs.as_mut().unwrap() {
						if tx.data.id == *id {
							tx.broadcasting_height = None;
							break;
						}
					}
				}
				// Post transaction.
				match w.post(&s, Some(*id)) {
					Ok(_) => {
						sync_wallet_data(&w, false);
					}
					Err(e) => {
						error!("tx post error: {:?}", e);
						w.on_tx_error(*id, Some(e));
					}
				}
			} else {
				error!("tx post: slate not found");
				w.task(WalletTask::Cancel(*id));
			}
		}
		WalletTask::Cancel(id) => match w.cancel(*id) {
			Ok(_) => {
				sync_wallet_data(&w, false);
			}
			Err(e) => {
				error!("tx cancel error: {:?}", e);
				w.on_tx_error(*id, Some(e));
			}
		},
		WalletTask::VerifyProof(p, _) => {
			w.proof_verifying.store(true, Ordering::Relaxed);
			let res = w.verify_payment_proof(p);
			w.proof_verifying.store(false, Ordering::Relaxed);
			w.on_task_result(None, &WalletTask::VerifyProof(p.clone(), Some(res)));
		}
		WalletTask::Delete(id) => match w.delete_tx(*id) {
			Ok(_) => sync_wallet_data(&w, false),
			Err(e) => {
				error!("tx delete error: {:?}", e);
				w.on_tx_error(*id, Some(e));
			}
		},
		WalletTask::StartTor => {
			let r_foreign_api = w.foreign_api_server.read();
			if let Some(api) = r_foreign_api.as_ref() {
				let id = w.identifier();
				Tor::start_service(api.1, Some(w), &id);
			}
		}
	};
}

/// Refresh [`WalletData`] from local base or node.
fn sync_wallet_data(wallet: &Wallet, from_node: bool) {
	// Update info sync progress at separate thread.
	let wallet_info = wallet.clone();
	let (info_tx, info_rx) = mpsc::channel::<StatusMessage>();
	thread::spawn(move || {
		while let Ok(m) = info_rx.recv() {
			match m {
				StatusMessage::UpdatingOutputs(_) => {}
				StatusMessage::UpdatingTransactions(_) => {}
				StatusMessage::FullScanWarn(_) => {}
				StatusMessage::Scanning(_, progress) => {
					wallet_info
						.info_sync_progress
						.store(progress, Ordering::Relaxed);
				}
				StatusMessage::ScanningComplete(_) => {
					wallet_info.info_sync_progress.store(100, Ordering::Relaxed);
				}
				StatusMessage::UpdateWarning(_) => {}
			}
		}
	});

	let config = wallet.get_config();

	// Retrieve wallet info.
	let r_inst = wallet.instance.as_ref().read();
	if r_inst.is_some() {
		let instance = r_inst.clone().unwrap();
		if let Ok((_, info)) = retrieve_summary_info(
			instance.clone(),
			wallet.keychain_mask().as_ref(),
			&Some(info_tx),
			from_node,
			config.min_confirmations,
		) {
			// Do not retrieve txs if wallet was closed or its first sync.
			if !wallet.is_open()
				|| wallet.is_closing()
				|| (!from_node && info.last_confirmed_height == 0)
			{
				return;
			}

			// Setup accounts data.
			let last_height = info.last_confirmed_height;
			let spendable = if wallet.get_data().is_none() {
				None
			} else {
				Some(info.amount_currently_spendable)
			};
			update_accounts(wallet, last_height, spendable);

			if wallet.info_sync_progress() == 100 || !from_node {
				// Transactions limit setup.
				let txs_limit = {
					let r_data = wallet.data.read();
					if r_data.is_some() {
						let data = r_data.as_ref().unwrap();
						data.txs_limit
					} else {
						WalletData::TXS_LIMIT
					}
				};
				// Update wallet info.
				{
					let mut w_data = wallet.data.write();
					if w_data.is_some() {
						w_data.as_mut().unwrap().info = info;
					} else {
						*w_data = Some(WalletData {
							info,
							txs: None,
							txs_limit,
						});
					}
				}
				// Update wallet transactions.
				if update_txs(wallet, txs_limit).is_ok() {
					if !wallet.from_node.load(Ordering::Relaxed) {
						wallet.from_node.store(from_node, Ordering::Relaxed);
					}
					wallet.reset_sync_attempts();
					return;
				}
			}
		}
	}

	// Reset progress.
	wallet.info_sync_progress.store(0, Ordering::Relaxed);

	// Exit if wallet was closed or closing.
	if !wallet.is_open() || wallet.is_closing() {
		return;
	}

	// Set an error if data was not loaded after opening or increment attempts count.
	if wallet.get_data().is_none() {
		wallet.set_sync_error(true);
	} else {
		wallet.increment_sync_attempts();
	}

	// Set an error if maximum number of attempts was reached.
	if wallet.get_sync_attempts() >= SYNC_ATTEMPTS {
		wallet.reset_sync_attempts();
		wallet.set_sync_error(true);
	}
}

/// Update wallet transactions.
fn update_txs(wallet: &Wallet, mut txs_limit: u32) -> Result<(), Error> {
	let _ = wallet.clear_empty_txs();
	let txs = wallet.retrieve_txs(txs_limit)?;

	// Exit if wallet was closed.
	if !wallet.is_open() || wallet.is_closing() {
		return Err(Error::GenericError("Wallet is not open".to_string()));
	}

	// Update limit with actual length.
	let txs_size = txs.len() as u32;
	let filter_size = txs.len() as u32;

	if txs_size > filter_size && txs_limit >= filter_size {
		txs_limit = txs_limit - (txs_size - filter_size);
	}

	// Update existing tx list.
	let tx_height_store = TxHeightStore::new(wallet.get_config().get_extra_db_path());
	let data = wallet.get_data().unwrap();
	let data_txs = data.txs.unwrap_or(vec![]);
	let mut new_txs: Vec<WalletTx> = vec![];
	for tx in &txs {
		let mut height: Option<u64> = None;
		let mut broadcasting_height: Option<u64> = None;
		let mut action: Option<WalletTxAction> = None;
		let mut action_error: Option<Error> = None;
		let mut proof: Option<PaymentProof> = None;
		for t in &data_txs {
			if t.data.id == tx.id {
				action = t.action.clone();
				action_error = t.action_error.clone();
				height = t.height;
				broadcasting_height = t.broadcasting_height;
				proof = t.proof.clone();
				break;
			}
		}
		let mut new = WalletTx::new(
			tx.clone(),
			proof.clone(),
			height,
			broadcasting_height,
			action,
			action_error,
		);
		// Payment proof setup.
		if proof.is_none()
			&& tx.payment_proof.is_some()
			&& tx
				.payment_proof
				.as_ref()
				.unwrap()
				.receiver_signature
				.is_some()
			&& tx
				.payment_proof
				.as_ref()
				.unwrap()
				.sender_signature
				.is_some()
			&& tx.kernel_excess.is_some()
		{
			if let Ok(p) = wallet.get_payment_proof(Some(tx.id), tx.tx_slate_id) {
				proof = p.clone();
				new.proof = proof;
			}
		}
		// Initial tx heights setup.
		if let Some(slate_id) = tx.tx_slate_id {
			let id = slate_id.to_string();
			if height.is_none() && tx.confirmed {
				height = if let Some(height) = tx_height_store.read_tx_height(&id) {
					Some(height)
				} else {
					tx_height_store.delete_broadcasting_height(&id);
					let h = wallet.tx_height(&new)?;
					if let Some(h) = h {
						tx_height_store.write_tx_height(&id, h);
					}
					h
				};
				new.height = height;
			} else if broadcasting_height.is_none() && new.broadcasting() {
				let br_height = tx_height_store.read_broadcasting_height(&id);
				broadcasting_height = if br_height.is_none() || br_height.unwrap() == 0 {
					let h = data.info.last_confirmed_height;
					tx_height_store.write_broadcasting_height(&id, h);
					Some(h)
				} else {
					Some(br_height.unwrap())
				};
				new.broadcasting_height = broadcasting_height;
			}
		}
		if !new.deleting() {
			new_txs.push(new);
		}
	}
	// Update wallet txs.
	let mut w_data = wallet.data.write();
	if w_data.is_some() {
		w_data.as_mut().unwrap().txs_limit = txs_limit;
		w_data.as_mut().unwrap().txs = Some(new_txs);
	}
	Ok(())
}

/// Start Foreign API server to receive txs over transport and mining rewards.
fn start_api_server(wallet: &Wallet) -> Result<(ApiServer, u16), Error> {
	let host = "127.0.0.1";
	let port = wallet
		.get_config()
		.api_port
		.unwrap_or(rand::rng().random_range(10000..30000));
	let free_port = (port..)
		.find(|port| {
			return match TcpListener::bind((host, port.to_owned())) {
				Ok(_) => {
					let node_p2p_port = NodeConfig::get_p2p_port();
					let node_api_port = NodeConfig::get_api_address().1;
					let free =
						port.to_string() != node_p2p_port && port.to_string() != node_api_port;
					if free {
						let mut config = wallet.config.write();
						config.api_port = Some(*port);
						config.save();
					}
					free
				}
				Err(_) => false,
			};
		})
		.unwrap();

	// Setup API server address.
	let api_addr = format!("{}:{}", host, free_port);

	// Start Foreign API server thread.
	let r_inst = wallet.instance.as_ref().read();
	let instance = r_inst.clone().unwrap();
	let keychain_mask = wallet.keychain_mask();
	let api_handler_v2 = ForeignAPIHandlerV2::new(
		instance,
		Arc::new(Mutex::new(keychain_mask)),
		false,
		Mutex::new(None),
	);
	let mut router = Router::new();
	router
		.add_route("/v2/foreign", Arc::new(api_handler_v2))
		.map_err(|_| Error::GenericError("Router failed to add route".to_string()))?;

	let api_chan: &'static mut (oneshot::Sender<()>, oneshot::Receiver<()>) =
		Box::leak(Box::new(oneshot::channel::<()>()));

	let mut apis = ApiServer::new();
	let socket_addr: SocketAddr = api_addr.parse().unwrap();
	let _ = apis
		.start(socket_addr, router, None, api_chan)
		.map_err(|_| Error::GenericError("API thread failed to start".to_string()))?;
	Ok((apis, free_port))
}

/// Update wallet accounts data.
fn update_accounts(wallet: &Wallet, height: u64, spendable: Option<u64>) {
	let current_account = wallet.get_config().account;
	if let Some(amount) = spendable {
		let mut accounts = wallet.accounts.read().clone();
		for a in accounts.iter_mut() {
			if a.label == current_account {
				a.spendable_amount = amount;
			}
		}
		// Save accounts data.
		let mut w_data = wallet.accounts.write();
		*w_data = accounts;
	} else {
		let r_inst = wallet.instance.as_ref().read();
		let instance = r_inst.clone().unwrap();
		let mut api = Owner::new(instance, None);
		let key_mask = wallet.keychain_mask();
		let _ = controller::owner_single_use(None, key_mask.as_ref(), Some(&mut api), |api, m| {
			let mut accounts = vec![];
			for a in api.accounts(m)? {
				api.set_active_account(m, a.label.as_str())?;
				// Calculate account balance.
				if let Some(spendable_amount) = wallet.account_balance(height, api, m) {
					accounts.push(WalletAccount {
						spendable_amount,
						label: a.label,
						path: a.path.to_bip_32_string(),
					});
				}
			}
			accounts.sort_by_key(|w| w.label != current_account);

			// Save accounts data.
			let mut w_data = wallet.accounts.write();
			*w_data = accounts;

			// Set current active account from config.
			api.set_active_account(m, current_account.as_str())?;

			Ok(())
		});
	}
}

/// Scan wallet's outputs, repairing and restoring missing outputs if required.
fn repair_wallet(wallet: &Wallet) {
	let (info_tx, info_rx) = mpsc::channel::<StatusMessage>();
	// Update scan progress at separate thread.
	let wallet_scan = wallet.clone();
	thread::spawn(move || {
		while let Ok(m) = info_rx.recv() {
			match m {
				StatusMessage::UpdatingOutputs(_) => {}
				StatusMessage::UpdatingTransactions(_) => {}
				StatusMessage::FullScanWarn(_) => {}
				StatusMessage::Scanning(_, progress) => {
					wallet_scan
						.repair_progress
						.store(progress, Ordering::Relaxed);
				}
				StatusMessage::ScanningComplete(_) => {
					wallet_scan.repair_progress.store(100, Ordering::Relaxed);
				}
				StatusMessage::UpdateWarning(_) => {}
			}
		}
	});

	let r_inst = wallet.instance.as_ref().read();
	let instance = r_inst.clone().unwrap();
	let api = Owner::new(instance, Some(info_tx));
	// Start wallet scanning.
	match api.scan(wallet.keychain_mask().as_ref(), Some(1), false) {
		Ok(()) => {
			// Set sync error if scanning was not complete and wallet is open.
			if wallet.is_open() && wallet.repair_progress.load(Ordering::Relaxed) != 100 {
				wallet.set_sync_error(true);
			} else {
				wallet.repair_needed.store(false, Ordering::Relaxed);
			}
		}
		Err(_) => {
			// Set sync error if wallet is open.
			if wallet.is_open() {
				wallet.set_sync_error(true);
			} else {
				wallet.repair_needed.store(false, Ordering::Relaxed);
			}
		}
	}

	// Reset repair progress.
	wallet.repair_progress.store(0, Ordering::Relaxed);
}