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/utils.rs

@@ -5,7 +5,10 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt, EnvFilte
 
 use crate::{
     common::{config::ConfigLoader, get_logger_timer_rfc3339},
-    rpc::cli::{NatType, PeerInfo, Route},
+    proto::{
+        cli::{PeerInfo, Route},
+        common::NatType,
+    },
 };
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -114,17 +117,11 @@ pub fn list_peer_route_pair(peers: Vec<PeerInfo>, routes: Vec<Route>) -> Vec<Pee
 
     for route in routes.iter() {
         let peer = peers.iter().find(|peer| peer.peer_id == route.peer_id);
-        let has_tunnel = peer.map(|p| !p.conns.is_empty()).unwrap_or(false);
-        let mut pair = PeerRoutePair {
+        let pair = PeerRoutePair {
             route: route.clone(),
             peer: peer.cloned(),
         };
 
-        // it is relayed by public server, adjust the cost
-        if !has_tunnel && pair.route.cost == 1 {
-            pair.route.cost = 2;
-        }
-
         pairs.push(pair);
     }