stream_pipe.h

#ifndef SRC_STREAM_PIPE_H_
#define SRC_STREAM_PIPE_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "stream_base.h"

namespace node {

class StreamPipe : public AsyncWrap {
 public:
  ~StreamPipe() override;

  void Unpipe(bool is_in_deletion = false);

  // TODO(RaisinTen): Just like MessagePort, add the following overload:
  // static StreamPipe* New(StreamBase* source, StreamBase* sink,
  //                        v8::Local<v8::Object> obj);
  // so that we can indicate if there is a pending exception/termination.
  static void New(const v8::FunctionCallbackInfo<v8::Value>& args);
  static void Start(const v8::FunctionCallbackInfo<v8::Value>& args);
  static void Unpipe(const v8::FunctionCallbackInfo<v8::Value>& args);
  static void IsClosed(const v8::FunctionCallbackInfo<v8::Value>& args);
  static void PendingWrites(const v8::FunctionCallbackInfo<v8::Value>& args);

  SET_NO_MEMORY_INFO()
  SET_MEMORY_INFO_NAME(StreamPipe)
  SET_SELF_SIZE(StreamPipe)

 private:
  StreamPipe(StreamBase* source, StreamBase* sink, v8::Local<v8::Object> obj);

  inline StreamBase* source();
  inline StreamBase* sink();

  int pending_writes_ = 0;
  bool is_reading_ = false;
  bool is_eof_ = false;
  bool is_closed_ = true;
  bool sink_destroyed_ = false;
  bool source_destroyed_ = false;
  bool uses_wants_write_ = false;

  // Set a default value so that when we’re coming from Start(), we know
  // that we don’t want to read just yet.
  // This will likely need to be changed when supporting streams without
  // `OnStreamWantsWrite()` support.
  size_t wanted_data_ = 0;

  void ProcessData(size_t nread, std::unique_ptr<v8::BackingStore> bs);

  class ReadableListener : public StreamListener {
   public:
    uv_buf_t OnStreamAlloc(size_t suggested_size) override;
    void OnStreamRead(ssize_t nread, const uv_buf_t& buf) override;
    void OnStreamDestroy() override;
  };

  class WritableListener : public StreamListener {
   public:
    uv_buf_t OnStreamAlloc(size_t suggested_size) override;
    void OnStreamRead(ssize_t nread, const uv_buf_t& buf) override;
    void OnStreamAfterWrite(WriteWrap* w, int status) override;
    void OnStreamAfterShutdown(ShutdownWrap* w, int status) override;
    void OnStreamWantsWrite(size_t suggested_size) override;
    void OnStreamDestroy() override;
  };

  ReadableListener readable_listener_;
  WritableListener writable_listener_;
};

}  // namespace node

#endif

#endif  // SRC_STREAM_PIPE_H_