add feature to specify default backend

src/proxy/proxy_handler.rs

@@ -39,8 +39,11 @@ where
     } else {
       return http_error(StatusCode::SERVICE_UNAVAILABLE);
     };
-    let backend = if let Some(be) = self.backends.get(server_name.as_str()) {
+    let backend = if let Some(be) = self.backends.apps.get(server_name.as_str()) {
       be
+    } else if let Some(default_be) = &self.backends.default_app {
+      debug!("Serving by default app: {}", default_be);
+      self.backends.apps.get(default_be).unwrap()
     } else {
       return http_error(StatusCode::SERVICE_UNAVAILABLE);
     };

src/proxy/proxy_main.rs

@@ -1,9 +1,9 @@
 // use super::proxy_handler::handle_request;
-use crate::{backend::Backend, error::*, globals::Globals, log::*};
+use crate::{backend::Backends, error::*, globals::Globals, log::*};
 use hyper::{
   client::connect::Connect, server::conn::Http, service::service_fn, Body, Client, Request,
 };
-use std::{collections::HashMap, net::SocketAddr, sync::Arc};
+use std::{net::SocketAddr, sync::Arc};
 use tokio::{
   io::{AsyncRead, AsyncWrite},
   net::TcpListener,
@@ -38,8 +38,8 @@ where
   T: Connect + Clone + Sync + Send + 'static,
 {
   pub listening_on: SocketAddr,
-  pub tls_enabled: bool,                       // TCP待受がTLSかどうか
-  pub backends: Arc<HashMap<String, Backend>>, // TODO: hyper::uriで抜いたhostで引っ掛ける。Stringでいいのか？
+  pub tls_enabled: bool, // TCP待受がTLSかどうか
+  pub backends: Arc<Backends>,
   pub forwarder: Arc<Client<T>>,
   pub globals: Arc<Globals>,
 }

src/proxy/proxy_tls.rs

@@ -17,7 +17,7 @@ where
     let cert_service = async {
       info!("Start cert watch service for {}", self.listening_on);
       loop {
-        for (server_name, backend) in self.backends.iter() {
+        for (server_name, backend) in self.backends.apps.iter() {
           if backend.tls_cert_key_path.is_some() && backend.tls_cert_path.is_some() {
             if let Err(_e) = backend.update_server_config().await {
               warn!("Failed to update certs for {}", server_name);
@@ -53,7 +53,7 @@ where
               info!("No SNI in ClientHello");
               continue;
             };
-            let backend_serve = if let Some(backend_serve) = self.backends.get(svn){
+            let backend_serve = if let Some(backend_serve) = self.backends.apps.get(svn){
               backend_serve
             } else {
               info!("No configuration for the server name {} given in client_hello", svn);