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

easytier/src/vpn_portal/mod.rs

@@ -0,0 +1,24 @@
+// with vpn portal, user can use other vpn client to connect to easytier servers
+// without installing easytier.
+// these vpn client include:
+// 1. wireguard
+// 2. openvpn (TODO)
+// 3. shadowsocks (TODO)
+
+use std::sync::Arc;
+
+use crate::{common::global_ctx::ArcGlobalCtx, peers::peer_manager::PeerManager};
+
+pub mod wireguard;
+
+#[async_trait::async_trait]
+pub trait VpnPortal: Send + Sync {
+    async fn start(
+        &mut self,
+        global_ctx: ArcGlobalCtx,
+        peer_mgr: Arc<PeerManager>,
+    ) -> anyhow::Result<()>;
+    async fn dump_client_config(&self, peer_mgr: Arc<PeerManager>) -> String;
+    fn name(&self) -> String;
+    async fn list_clients(&self) -> Vec<String>;
+}