Implement Rust Client: TUN, Noise Crypto, Transport and Coordinator integration

src/main.rs

@@ -1,95 +0,0 @@
-use bytes::{Bytes, BytesMut};
-use crossbeam_queue::ArrayQueue;
-use std::sync::Arc;
-use tokio::net::UdpSocket;
-use std::io;
-
-mod noise;
-
-/// Configuration for the data plane memory limits.
-const MAX_PACKET_SIZE: usize = 16384; // 16KB
-const PACKET_POOL_SIZE: usize = 10000; // ~160MB (10k * 16KB)
-const MAX_RAM_USAGE_MB: usize = 256;
-
-/// A fixed-size packet pool to prevent excessive allocations and fragmentation.
-struct PacketPool {
-    pool: Arc<ArrayQueue<BytesMut>>,
-}
-
-impl PacketPool {
-    fn new(capacity: usize, packet_size: usize) -> Self {
-        let queue = ArrayQueue::new(capacity);
-        for _ in 0..capacity {
-            let _ = queue.push(BytesMut::with_capacity(packet_size));
-        }
-        Self {
-            pool: Arc::new(queue),
-        }
-    }
-
-    /// Acquires a buffer from the pool or creates a new one if the pool is empty
-    /// (though in a strict memory-constrained environment, we might prefer to drop packets).
-    fn acquire(&self) -> BytesMut {
-        self.pool.pop().unwrap_or_else(|| BytesMut::with_capacity(MAX_PACKET_SIZE))
-    }
-
-    /// Returns a buffer to the pool for reuse.
-    fn release(&self, mut buf: BytesMut) {
-        buf.clear();
-        let _ = self.pool.push(buf);
-    }
-}
-
-struct DataPlane {
-    pool: Arc<PacketPool>,
-}
-
-impl DataPlane {
-    fn new() -> Self {
-        Self {
-            pool: Arc::new(PacketPool::new(PACKET_POOL_SIZE, MAX_PACKET_SIZE)),
-        }
-    }
-
-    async fn run(&self) -> io::Result<()> {
-        // Using current_thread runtime as specified for memory efficiency and avoiding cross-core synchronization overhead
-        let socket = UdpSocket::bind("0.0.0.0:0").await?;
-        println!("Data plane listening on {}", socket.local_addr()?);
-
-        loop {
-            let mut buf = self.pool.acquire();
-
-            // Zero-copy receiving: reading directly into the pooled buffer
-            match socket.recv_from(&mut buf).await {
-                Ok((len, addr)) => {
-                    // Use BytesMut::split_to to create a zero-copy 'Bytes' view for processing
-                    let packet = buf.split_to(len).freeze();
-
-                    // Simulate processing the packet without copying data
-                    self.process_packet(packet, addr).await;
-
-                    // Return the remaining buffer to the pool
-                    self.pool.release(buf);
-                }
-                Err(e) => {
-                    eprintln!("Error receiving packet: {}", e);
-                    self.pool.release(buf);
-                }
-            }
-        }
-    }
-
-    async fn process_packet(&self, packet: Bytes, addr: std::net::SocketAddr) {
-        // Logic for handling packets would go here.
-        // 'packet' is a reference-counted view into the original buffer.
-        let _ = packet.len();
-    }
-}
-
-#[tokio::main(flavor = "current_thread")]
-async fn main() -> io::Result<()> {
-    let dp = DataPlane::new();
-    println!("Starting memory-efficient data plane...");
-    println!("Estimated pool memory: {} MB", (PACKET_POOL_SIZE * MAX_PACKET_SIZE) / 1024 / 1024);
-    dp.run().await
-}