src,stream: improve WriteString

Introduce HasDoTryWrite and make use of it in WriteString

src/stream_base.cc

@@ -91,7 +91,7 @@ StreamWriteResult StreamBase::Write(uv_buf_t* bufs,
   for (size_t i = 0; i < count; ++i) total_bytes += bufs[i].len;
   bytes_written_ += total_bytes;
 
-  if (send_handle == nullptr && !skip_try_write) {
+  if (send_handle == nullptr && HasDoTryWrite() && !skip_try_write) {
     err = DoTryWrite(&bufs, &count);
     if (err != 0 || count == 0) {
       return StreamWriteResult{false, err, nullptr, total_bytes, {}};
@@ -365,7 +365,7 @@ int StreamBase::WriteString(const FunctionCallbackInfo<Value>& args) {
   size_t synchronously_written = 0;
   uv_buf_t buf;
 
-  bool try_write = storage_size <= sizeof(stack_storage) &&
+  bool try_write = HasDoTryWrite() && storage_size <= sizeof(stack_storage) &&
                    (!IsIPCPipe() || send_handle_obj.IsEmpty());
   if (try_write) {
     data_size = StringBytes::Write(isolate,

src/stream_base.h

@@ -244,6 +244,7 @@ class StreamResource {
   // `*bufs` and `*count` accordingly. This is a no-op by default.
   // Return 0 for success and a libuv error code for failures.
   virtual int DoTryWrite(uv_buf_t** bufs, size_t* count);
+  virtual inline bool HasDoTryWrite() const { return false; }
   // Initiate a write of data.
   // Upon an immediate failure, a libuv error code is returned,
   // w->Done() will never be called and caller should free `bufs`.

src/stream_wrap.h

@@ -52,6 +52,7 @@ class LibuvStreamWrap : public HandleWrap, public StreamBase {
   // Resource implementation
   int DoShutdown(ShutdownWrap* req_wrap) override;
   int DoTryWrite(uv_buf_t** bufs, size_t* count) override;
+  inline bool HasDoTryWrite() const override { return true; };
   int DoWrite(WriteWrap* w,
               uv_buf_t* bufs,
               size_t count,