stream_wrap: add HandleScope's in uv callbacks

Ensure that no handles will leak into global HandleScope by adding
HandleScope's in all JS-calling libuv callbacks in `stream_wrap.cc`.

Fix: #1075
PR-URL: #1078
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>

src/stream_wrap.cc

@@ -145,6 +145,9 @@ void StreamWrap::OnAlloc(uv_handle_t* handle,
                          size_t suggested_size,
                          uv_buf_t* buf) {
   StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
+  HandleScope scope(wrap->env()->isolate());
+  Context::Scope context_scope(wrap->env()->context());
+
   CHECK_EQ(wrap->stream(), reinterpret_cast<uv_stream_t*>(handle));
 
   return static_cast<StreamBase*>(wrap)->OnAlloc(suggested_size, buf);
@@ -229,6 +232,7 @@ void StreamWrap::OnReadCommon(uv_stream_t* handle,
                               const uv_buf_t* buf,
                               uv_handle_type pending) {
   StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
+  HandleScope scope(wrap->env()->isolate());
 
   // We should not be getting this callback if someone as already called
   // uv_close() on the handle.
@@ -280,6 +284,8 @@ int StreamWrap::DoShutdown(ShutdownWrap* req_wrap) {
 
 void StreamWrap::AfterShutdown(uv_shutdown_t* req, int status) {
   ShutdownWrap* req_wrap = ContainerOf(&ShutdownWrap::req_, req);
+  HandleScope scope(req_wrap->env()->isolate());
+  Context::Scope context_scope(req_wrap->env()->context());
   req_wrap->Done(status);
 }
 
@@ -354,6 +360,8 @@ int StreamWrap::DoWrite(WriteWrap* w,
 
 void StreamWrap::AfterWrite(uv_write_t* req, int status) {
   WriteWrap* req_wrap = ContainerOf(&WriteWrap::req_, req);
+  HandleScope scope(req_wrap->env()->isolate());
+  Context::Scope context_scope(req_wrap->env()->context());
   req_wrap->Done(status);
 }
 

src/tls_wrap.cc

@@ -26,7 +26,6 @@ using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
 using v8::Handle;
-using v8::HandleScope;
 using v8::Integer;
 using v8::Local;
 using v8::Null;
@@ -251,8 +250,6 @@ void TLSWrap::SSLInfoCallback(const SSL* ssl_, int where, int ret) {
   SSL* ssl = const_cast<SSL*>(ssl_);
   TLSWrap* c = static_cast<TLSWrap*>(SSL_get_app_data(ssl));
   Environment* env = c->env();
-  HandleScope handle_scope(env->isolate());
-  Context::Scope context_scope(env->context());
   Local<Object> object = c->object();
 
   if (where & SSL_CB_HANDSHAKE_START) {
@@ -395,9 +392,6 @@ void TLSWrap::ClearOut() {
   if (eof_)
     return;
 
-  HandleScope handle_scope(env()->isolate());
-  Context::Scope context_scope(env()->context());
-
   CHECK_NE(ssl_, nullptr);
 
   char out[kClearOutChunkSize];
@@ -470,9 +464,6 @@ bool TLSWrap::ClearIn() {
     return true;
   }
 
-  HandleScope handle_scope(env()->isolate());
-  Context::Scope context_scope(env()->context());
-
   // Error or partial write
   int err;
   Local<Value> arg = GetSSLError(written, &err, &error_);
@@ -588,8 +579,6 @@ int TLSWrap::DoWrite(WriteWrap* w,
 
   if (i != count) {
     int err;
-    HandleScope handle_scope(env()->isolate());
-    Context::Scope context_scope(env()->context());
     Local<Value> arg = GetSSLError(written, &err, &error_);
     if (!arg.IsEmpty())
       return UV_EPROTO;
@@ -662,8 +651,6 @@ void TLSWrap::DoRead(ssize_t nread,
       eof_ = true;
     }
 
-    HandleScope handle_scope(env()->isolate());
-    Context::Scope context_scope(env()->context());
     OnRead(nread, nullptr);
     return;
   }
@@ -796,7 +783,6 @@ int TLSWrap::SelectSNIContextCallback(SSL* s, int* ad, void* arg) {
   if (servername == nullptr)
     return SSL_TLSEXT_ERR_OK;
 
-  HandleScope scope(env->isolate());
   // Call the SNI callback and use its return value as context
   Local<Object> object = p->object();
   Local<Value> ctx = object->Get(env->sni_context_string());