feat: Kill monero-wallet-rpc on GUI exit

src-tauri/src/lib.rs

@@ -11,7 +11,7 @@ use swap::{
     },
     cli::command::{Bitcoin, Monero},
 };
-use tauri::{Manager, State};
+use tauri::{Manager, RunEvent, State};
 
 trait ToStringResult<T> {
     fn to_string_result(self) -> Result<T, String>;
@@ -107,6 +107,16 @@ pub fn run() {
             withdraw_btc
         ])
         .setup(setup)
-        .run(tauri::generate_context!())
+        .build(tauri::generate_context!())
-        .expect("error while running tauri application");
+        .expect("error while building tauri application")
+        .run(|app, event| match event {
+            RunEvent::Exit | RunEvent::ExitRequested { .. } => {
+                let context = app.state::<Arc<Context>>().inner();
+
+                if let Err(err) = context.cleanup() {
+                    println!("Cleanup failed {}", err);
+                }
+            }
+            _ => {}
+        })
 }

swap/src/api.rs

@@ -7,14 +7,14 @@ use crate::network::rendezvous::XmrBtcNamespace;
 use crate::protocol::Database;
 use crate::seed::Seed;
 use crate::{bitcoin, cli, monero};
-use anyhow::{bail, Context as AnyContext, Error, Result};
+use anyhow::{anyhow, bail, Context as AnyContext, Error, Result};
 use futures::future::try_join_all;
 use std::fmt;
 use std::future::Future;
 use std::net::SocketAddr;
 use std::path::PathBuf;
-use std::sync::{Arc, Once};
+use std::sync::{Arc, Mutex, Once};
-use tokio::sync::{broadcast, broadcast::Sender, Mutex, RwLock};
+use tokio::sync::{broadcast, broadcast::Sender, Mutex as TokioMutex, RwLock};
 use tokio::task::JoinHandle;
 use url::Url;
 
@@ -36,7 +36,7 @@ pub struct Config {
 use uuid::Uuid;
 
 #[derive(Default)]
-pub struct PendingTaskList(Mutex<Vec<JoinHandle<()>>>);
+pub struct PendingTaskList(TokioMutex<Vec<JoinHandle<()>>>);
 
 impl PendingTaskList {
     pub async fn spawn<F, T>(&self, future: F)
@@ -164,7 +164,7 @@ pub struct Context {
     pub db: Arc<dyn Database + Send + Sync>,
     bitcoin_wallet: Option<Arc<bitcoin::Wallet>>,
     monero_wallet: Option<Arc<monero::Wallet>>,
-    monero_rpc_process: Option<Arc<monero::WalletRpcProcess>>,
+    monero_rpc_process: Option<Arc<Mutex<monero::WalletRpcProcess>>>,
     pub swap_lock: Arc<SwapLock>,
     pub config: Config,
     pub tasks: Arc<PendingTaskList>,
@@ -228,7 +228,7 @@ impl Context {
             db: open_db(data_dir.join("sqlite")).await?,
             bitcoin_wallet,
             monero_wallet,
-            monero_rpc_process: monero_rpc_process.map(Arc::new),
+            monero_rpc_process: monero_rpc_process.map(|prc| Arc::new(Mutex::new(prc))),
             config: Config {
                 tor_socks5_port,
                 namespace: XmrBtcNamespace::from_is_testnet(is_testnet),
@@ -268,6 +268,19 @@ impl Context {
             tasks: Arc::new(PendingTaskList::default()),
         }
     }
+
+    pub fn cleanup(&self) -> Result<()> {
+        if let Some(ref monero_rpc_process) = self.monero_rpc_process {
+            let mut process = monero_rpc_process
+                .lock()
+                .map_err(|_| anyhow!("Failed to lock monero_rpc_process for cleanup"))?;
+
+            process.kill()?;
+            println!("Killed monero-wallet-rpc process");
+        }
+
+        Ok(())
+    }
 }
 
 impl fmt::Debug for Context {

swap/src/monero/wallet_rpc.rs

@@ -8,12 +8,12 @@ use reqwest::header::CONTENT_LENGTH;
 use reqwest::Url;
 use serde::Deserialize;
 use sha2::{Digest, Sha256};
-use std::fmt;
 use std::fmt::{Debug, Display, Formatter};
 use std::io::ErrorKind;
 use std::path::{Path, PathBuf};
 use std::process::Stdio;
 use std::time::Duration;
+use std::{fmt, io};
 use tokio::fs::{remove_file, OpenOptions};
 use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
 use tokio::process::{Child, Command};
@@ -178,6 +178,10 @@ impl WalletRpcProcess {
         Url::parse(&format!("http://127.0.0.1:{}/json_rpc", self.port))
             .expect("Static url template is always valid")
     }
+
+    pub fn kill(&mut self) -> io::Result<()> {
+        self._child.start_kill()
+    }
 }
 
 pub struct WalletRpc {