[fix][client] prevent garbage collection of token-supplier (#412)

* Add persistent reference to Auth Object

* Update src/Client.cc

---------

Co-authored-by: Yunze Xu <xyzinfernity@163.com>

Author: klaatu01

src/Client.cc

@@ -144,7 +144,8 @@ Client::Client(const Napi::CallbackInfo &info) : Napi::ObjectWrap<Client>(info)
   if (clientConfig.Has(CFG_AUTH) && clientConfig.Get(CFG_AUTH).IsObject()) {
     Napi::Object obj = clientConfig.Get(CFG_AUTH).ToObject();
     if (obj.Has(CFG_AUTH_PROP) && obj.Get(CFG_AUTH_PROP).IsObject()) {
-      Authentication *auth = Authentication::Unwrap(obj.Get(CFG_AUTH_PROP).ToObject());
+      this->authRef_ = Napi::Persistent(obj.Get(CFG_AUTH_PROP).As<Napi::Object>());
+      Authentication *auth = Authentication::Unwrap(this->authRef_.Value());
       pulsar_client_configuration_set_auth(cClientConfig.get(), auth->GetCAuthentication());
     }
   }

src/Client.h

@@ -54,6 +54,7 @@ class Client : public Napi::ObjectWrap<Client> {
   std::shared_ptr<pulsar_client_t> cClient;
   std::shared_ptr<pulsar_client_configuration_t> cClientConfig;
   pulsar_logger_level_t logLevel = pulsar_logger_level_t::pulsar_INFO;
+  Napi::ObjectReference authRef_;
 
   Napi::Value CreateProducer(const Napi::CallbackInfo &info);
   Napi::Value Subscribe(const Napi::CallbackInfo &info);