Adds SharedData<T>

.gitignore

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+/target

Cargo.lock

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Cargo.toml

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+[package]
+name = "shard"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1.40.0", features = ["sync", "time"] }

src/lib.rs

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+use std::sync::Arc;
+use tokio::sync::{Mutex, MutexGuard};
+use tokio::time::{timeout, Duration};
+
+/// Provides a 30 second timeout for lock attempts
+const LOCK_TIMEOUT: u64 = 30;
+
+#[derive(Clone)]
+pub struct SharedData<T> {
+    pub data: Arc<Mutex<T>>,
+}
+
+impl<T> SharedData<T> {
+    pub fn new(data: T) -> Self {
+        SharedData {
+            data: Arc::new(Mutex::new(data)),
+        }
+    }
+
+    /// Acquire lock
+    ///
+    /// Using:
+    /// ```
+    /// {
+    ///    let data = shared.lock().await;
+    ///    // make changes to T
+    /// }
+    /// ```
+    pub async fn lock(&self) -> MutexGuard<'_, T> {
+        let result = timeout(Duration::from_secs(LOCK_TIMEOUT), self.data.lock()).await;
+        if let Ok(guard) = result {
+            return guard;
+        }
+        panic!(
+            "Failed to acquire lock in {} seconds.  Deadlock?",
+            LOCK_TIMEOUT
+        );
+
+        // self.data.lock().await
+    }
+}