tracinghandler.h

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#ifndef ION_REMOTE_TRACINGHANDLER_H_
#define ION_REMOTE_TRACINGHANDLER_H_

#include <functional>
#include <sstream>
#include <string>

#include "base/integral_types.h"
#include "ion/gfx/renderer.h"
#include "ion/gfxutils/frame.h"
#include "ion/port/semaphore.h"
#include "ion/remote/httpserver.h"

namespace ion {
namespace remote {

class ION_API TracingHandler : public HttpServer::RequestHandler {
 public:
  TracingHandler(const gfxutils::FramePtr& frame,
                 const gfx::RendererPtr& renderer);

  ~TracingHandler() override;

  const std::string HandleRequest(const std::string& path,
                                  const HttpServer::QueryMap& args,
                                  std::string* content_type) override;

 private:
  enum State {
    kInactive,              // Not actively tracing.
    kWaitingForBeginFrame,  // Waiting for BeginFrame() to be called.
    kWaitingForEndFrame,    // Waiting for EndFrame() to be called.
  };

  void TraceNextFrame(bool block_until_frame_rendered);

  void BeginFrame(const gfxutils::Frame& frame);
  void EndFrame(const gfxutils::Frame& frame);

  std::ostream* GetTracingStream() { return &tracing_stream_; }

  gfxutils::FramePtr frame_;
  gfx::RendererPtr renderer_;
  std::ostream* prev_stream_;
  std::ostringstream tracing_stream_;
  std::string html_string_;
  port::Semaphore semaphore_;
  State state_;
  uint64 frame_counter_;
  std::string resources_to_delete_;

  friend class TracingHandlerTest;
};

}  // namespace remote
}  // namespace ion

#endif  // ION_REMOTE_TRACINGHANDLER_H_