feat(daemon, cli): global DaemonConfig and an ability to get/save it using cli (#174)

* use one global Arc<DaemonConfig>

* implement commands

* replace Arc<DaemonConfig> with Arc<Mutex<DaemonConfig>> and fix pwsp-gui

* add pwsp-cli support

* replace serde_json::to_string_pretty with to_string

* refactor

* implement UpdateDaemonConfigCommand and use it in pwsp-gui so it now uses real in-memory config, not the saved one

* implement utils::gui get_daemon_config and update_daemon_config to simplify code

pwsp-lib/src/utils/daemon.rs

@@ -7,36 +7,52 @@ use crate::types::{
 use anyhow::Result;
 use std::os::unix::fs::{DirBuilderExt, MetadataExt, PermissionsExt};
 use std::path::PathBuf;
-use std::{env, error::Error, fs};
+use std::{
+    env,
+    error::Error,
+    fs,
+    sync::{Arc, Mutex, OnceLock},
+};
 use tokio::{
     io::{AsyncReadExt, AsyncWriteExt},
     net::UnixStream,
-    sync::{Mutex, OnceCell},
+    sync::{Mutex as AsyncMutex, OnceCell},
     time::{Duration, sleep},
 };
 
-static AUDIO_PLAYER: OnceCell<Mutex<AudioPlayer>> = OnceCell::const_new();
+static AUDIO_PLAYER: OnceCell<AsyncMutex<AudioPlayer>> = OnceCell::const_new();
+static DAEMON_CONFIG: OnceLock<Arc<Mutex<DaemonConfig>>> = OnceLock::new();
 
-pub async fn get_audio_player() -> Result<&'static Mutex<AudioPlayer>, String> {
+pub async fn get_audio_player() -> Result<&'static AsyncMutex<AudioPlayer>, String> {
     AUDIO_PLAYER
         .get_or_try_init(|| async {
             println!("Initializing audio player");
             match AudioPlayer::new().await {
-                Ok(player) => Ok(Mutex::new(player)),
+                Ok(player) => Ok(AsyncMutex::new(player)),
                 Err(err) => Err(err.to_string()),
             }
         })
         .await
 }
 
-pub fn get_daemon_config() -> DaemonConfig {
-    DaemonConfig::load_from_file().unwrap_or_else(|_| {
-        let config = DaemonConfig::default();
-        config.save_to_file().ok();
-        config
+pub fn get_daemon_config() -> &'static Arc<Mutex<DaemonConfig>> {
+    DAEMON_CONFIG.get_or_init(|| {
+        Arc::new(Mutex::new(DaemonConfig::load_from_file().unwrap_or_else(
+            |_| {
+                let config = DaemonConfig::default();
+                config.save_to_file().ok();
+                config
+            },
+        )))
     })
 }
 
+pub fn with_daemon_config<R>(f: impl FnOnce(&mut DaemonConfig) -> R) -> R {
+    let config = get_daemon_config().clone();
+    let mut guard = config.lock().unwrap();
+    f(&mut guard)
+}
+
 fn get_current_uid() -> u32 {
     rustix::process::geteuid().as_raw()
 }