- add: utils library

- add: packet-service to handle game client packets
- fix: health check for database-service
- fix: health check for auth-service

packet-service/src/bufferpool.rs

@@ -0,0 +1,31 @@
+use std::collections::VecDeque;
+use std::sync::Arc;
+use tokio::sync::{Semaphore, Mutex};
+
+const MAX_PACKET_SIZE: usize = 1024;
+
+pub struct BufferPool {
+    buffers: Mutex<VecDeque<Vec<u8>>>,
+    sem: Semaphore,
+}
+
+impl BufferPool {
+    pub fn new(pool_size: usize) -> Arc<Self> {
+        Arc::new(Self {
+            buffers: Mutex::new((0..pool_size).map(|_| vec![0u8; MAX_PACKET_SIZE]).collect()),
+            sem: Semaphore::new(pool_size),
+        })
+    }
+
+    pub async fn acquire(&self) -> Option<Vec<u8>> {
+        let _ = self.sem.acquire().await.ok()?;
+        let mut buffers = self.buffers.lock().await;
+        buffers.pop_front()
+    }
+
+    pub async fn release(&self, buffer: Vec<u8>) {
+        let mut buffers = self.buffers.lock().await;
+        buffers.push_back(buffer);
+        self.sem.add_permits(1);
+    }
+}