tls_wrap: do not hold persistent ref to parent

Hold non-persistent reference in JS, rather than in C++ to avoid cycles.

PR-URL: #1078
Reviewed-By: Ben Noordhuis <[email protected]>

Author: indutny

lib/_tls_wrap.js

@@ -286,6 +286,7 @@ TLSSocket.prototype._wrapHandle = function(handle) {
                 tls.createSecureContext();
   res = tls_wrap.wrap(handle, context.context, options.isServer);
   res._parent = handle;
+  res._secureContext = context;
   res.reading = handle.reading;
   Object.defineProperty(handle, 'reading', {
     get: function readingGetter() {

src/tls_wrap.cc

@@ -37,17 +37,14 @@ using v8::Value;
 TLSWrap::TLSWrap(Environment* env,
                  Kind kind,
                  StreamBase* stream,
-                 Handle<Object> stream_obj,
-                 Handle<Object> sc)
-    : SSLWrap<TLSWrap>(env, Unwrap<SecureContext>(sc), kind),
+                 SecureContext* sc)
+    : SSLWrap<TLSWrap>(env, sc, kind),
       StreamBase(env),
       AsyncWrap(env,
                 env->tls_wrap_constructor_function()->NewInstance(),
                 AsyncWrap::PROVIDER_TLSWRAP),
-      sc_(Unwrap<SecureContext>(sc)),
-      sc_handle_(env->isolate(), sc),
+      sc_(sc),
       stream_(stream),
-      stream_handle_(env->isolate(), stream_obj),
       enc_in_(nullptr),
       enc_out_(nullptr),
       clear_in_(nullptr),
@@ -84,9 +81,6 @@ TLSWrap::~TLSWrap() {
   clear_in_ = nullptr;
 
   sc_ = nullptr;
-  sc_handle_.Reset();
-  stream_handle_.Reset();
-  persistent().Reset();
 
 #ifdef SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
   sni_context_.Reset();
@@ -196,9 +190,9 @@ void TLSWrap::Wrap(const FunctionCallbackInfo<Value>& args) {
   });
   CHECK_NE(stream, nullptr);
 
-  TLSWrap* res = new TLSWrap(env, kind, stream, stream_obj, sc);
+  TLSWrap* res = new TLSWrap(env, kind, stream, Unwrap<SecureContext>(sc));
 
-  args.GetReturnValue().Set(res->persistent());
+  args.GetReturnValue().Set(res->object());
 }
 
 

src/tls_wrap.h

@@ -78,8 +78,7 @@ class TLSWrap : public crypto::SSLWrap<TLSWrap>,
   TLSWrap(Environment* env,
           Kind kind,
           StreamBase* stream,
-          v8::Handle<v8::Object> stream_obj,
-          v8::Handle<v8::Object> sc);
+          crypto::SecureContext* sc);
 
   static void SSLInfoCallback(const SSL* ssl_, int where, int ret);
   void InitSSL();
@@ -141,9 +140,7 @@ class TLSWrap : public crypto::SSLWrap<TLSWrap>,
 #endif  // SSL_CTRL_SET_TLSEXT_SERVERNAME_CB
 
   crypto::SecureContext* sc_;
-  v8::Persistent<v8::Object> sc_handle_;
   StreamBase* stream_;
-  v8::Persistent<v8::Object> stream_handle_;
   BIO* enc_in_;
   BIO* enc_out_;
   NodeBIO* clear_in_;