log when client channels connect successfully

src/CatSession.cc

@@ -111,6 +111,9 @@ void CatSession::dispatch_on_channel_error(Channel& ch, short events) {
 }
 
 void CatSession::on_channel_error(short events) {
+  if (events & BEV_EVENT_CONNECTED) {
+    this->log.info("Channel connected");
+  }
   if (events & BEV_EVENT_ERROR) {
     int err = EVUTIL_SOCKET_ERROR();
     this->log.warning("Error %d (%s) in unlinked client stream", err,

src/ProxyServer.cc

@@ -602,6 +602,9 @@ void ProxyServer::LinkedSession::on_error(Channel& ch, short events) {
   auto* session = reinterpret_cast<LinkedSession*>(ch.context_obj);
   bool is_server_stream = (&ch == &session->server_channel);
 
+  if (events & BEV_EVENT_CONNECTED) {
+    session->log.info("%s channel connected", is_server_stream ? "Server" : "Client");
+  }
   if (events & BEV_EVENT_ERROR) {
     int err = EVUTIL_SOCKET_ERROR();
     session->log.warning("Error %d (%s) in %s stream",