use customized rpc implementation, remove Tarpc & Tonic (#348)

This patch removes Tarpc & Tonic GRPC and implements a customized rpc framework, which can be used by peer rpc and cli interface.

web config server can also use this rpc framework.

moreover, rewrite the public server logic, use ospf route to implement public server based networking. this make public server mesh possible.

easytier/src/peers/peer_map.rs

@@ -10,7 +10,7 @@ use crate::{
         global_ctx::{ArcGlobalCtx, GlobalCtxEvent},
         PeerId,
     },
-    rpc::PeerConnInfo,
+    proto::cli::PeerConnInfo,
     tunnel::packet_def::ZCPacket,
     tunnel::TunnelError,
 };
@@ -66,7 +66,7 @@ impl PeerMap {
     }
 
     pub fn has_peer(&self, peer_id: PeerId) -> bool {
-        self.peer_map.contains_key(&peer_id)
+        peer_id == self.my_peer_id || self.peer_map.contains_key(&peer_id)
     }
 
     pub async fn send_msg_directly(&self, msg: ZCPacket, dst_peer_id: PeerId) -> Result<(), Error> {
@@ -113,10 +113,8 @@ impl PeerMap {
                 .get_next_hop_with_policy(dst_peer_id, policy.clone())
                 .await
             {
-                // for foreign network, gateway_peer_id may not connect to me
-                if self.has_peer(gateway_peer_id) {
-                    return Some(gateway_peer_id);
-                }
+                // NOTIC: for foreign network, gateway_peer_id may not connect to me
+                return Some(gateway_peer_id);
             }
         }