restructuring stuff

src/proxy/mod.rs

@@ -0,0 +1,27 @@
+mod tcp_proxy;
+
+use std::net::SocketAddr;
+use std::time::Instant;
+
+// owned and accessed by only one thread.
+pub struct ConnectionContext {
+    pub connection_id: u64,
+    pub client_addr: SocketAddr,
+    pub start_time: Instant,
+    pub backend_addr: Option<SocketAddr>,
+    pub bytes_transferred: usize,
+    // pub protocol: String,
+    // pub sticky_id: Option<String>,
+}
+
+impl ConnectionContext {
+    pub fn new(connection_id: u64, client_addr: SocketAddr) -> Self {
+        Self {
+            connection_id: connection_id,
+            client_addr: client_addr,
+            start_time: Instant::now(),
+            backend_addr: Default::default(),
+            bytes_transferred: 0,
+        }
+    }
+}

src/proxy/tcp_proxy.rs

@@ -0,0 +1,2 @@
+use super::*;
+