use workspace, prepare for config server and gui (#48)

easytier/src/common/constants.rs

@@ -0,0 +1,24 @@
+macro_rules! define_global_var {
+    ($name:ident, $type:ty, $init:expr) => {
+        pub static $name: once_cell::sync::Lazy<tokio::sync::Mutex<$type>> =
+            once_cell::sync::Lazy::new(|| tokio::sync::Mutex::new($init));
+    };
+}
+
+#[macro_export]
+macro_rules! use_global_var {
+    ($name:ident) => {
+        crate::common::constants::$name.lock().await.to_owned()
+    };
+}
+
+#[macro_export]
+macro_rules! set_global_var {
+    ($name:ident, $val:expr) => {
+        *crate::common::constants::$name.lock().await = $val
+    };
+}
+
+define_global_var!(MANUAL_CONNECTOR_RECONNECT_INTERVAL_MS, u64, 1000);
+
+pub const UDP_HOLE_PUNCH_CONNECTOR_SERVICE_ID: u32 = 2;