fixed buzzer use in tokio thread

src/buzzer.rs

@@ -1,5 +1,5 @@
 use rppal::gpio::{Gpio, OutputPin};
-use std::time;
+use std::{error::Error, time};
 use tokio::time::sleep;
 
 pub struct GPIOBuzzer {
@@ -7,7 +7,7 @@ pub struct GPIOBuzzer {
 }
 
 impl GPIOBuzzer {
-    pub fn new(pin_num: u8) -> Result<Self, Box<dyn std::error::Error>> {
+    pub fn new(pin_num: u8) -> Result<Self, Box<dyn Error>> {
         let gpio = Gpio::new()?;
         let pin = gpio.get(pin_num)?.into_output();
 

src/id_store.rs

@@ -4,7 +4,6 @@ use std::{
     error::Error,
     fmt::Display,
 };
-
 use tokio::fs;
 
 /// Represents the ID that is stored on the Tally
@@ -67,7 +66,7 @@ impl IDStore {
     }
 
     /// Writes the store to a json file
-    pub async fn export_json(&self, filepath: &str) -> Result<(), Box<dyn Error>> {
+    pub async fn export_json(&self, filepath: &str) -> Result<(), Box<dyn Error + Send + Sync>> {
         fs::write(filepath, serde_json::to_string(&self)?).await?;
         Ok(())
     }

src/main.rs

@@ -1,3 +1,4 @@
+use buzzer::GPIOBuzzer;
 use color::NamedColor;
 use id_store::IDStore;
 use log::{LevelFilter, error, info, warn};
@@ -69,8 +70,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
     };
 
     let store: Arc<Mutex<IDStore>> = Arc::new(Mutex::new(raw_store));
-
-    let mut gpio_buzzer = buzzer::GPIOBuzzer::new(4)?;
+    let gpio_buzzer: Arc<Mutex<GPIOBuzzer>> = Arc::new(Mutex::new(buzzer::GPIOBuzzer::new(4)?));
 
     let channel_store = store.clone();
     tokio::spawn(async move {
@@ -82,11 +82,12 @@ async fn main() -> Result<(), Box<dyn Error>> {
             {
                 info!("Added new id to current day");
                 // led.set_named_color_time(NamedColor::Green, 1); //led is green for 1 sec
-                gpio_buzzer.beep_ack().await;
+                gpio_buzzer.lock().await.beep_ack().await;
 
                 if let Err(e) = channel_store.lock().await.export_json(STORE_PATH).await {
                     error!("Failed to save id store to file: {}", e);
                     // TODO: How to handle a failure to save ?
+                    gpio_buzzer.lock().await.beep_nak().await;
                 }
             }
         }