classic_flow.h

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*/
 
#ifndef ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_FLOW_H_
#define ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_FLOW_H_
 
#include <system_error>
 
#include "processors/base/processor.h"
 
/**
 * the classic protocol flow.
 *
 * 1. Greeting handshake
 * 2. Commands
 */
class FlowProcessor : public Processor {
 public:
  using Processor::Processor;
 
  enum class Stage {
    Greeting,
    Command,
 
    Done,
  };
 
  stdx::expected<Processor::Result, std::error_code> process() override;
 
  void stage(Stage stage) { stage_ = stage; }
  [[nodiscard]] Stage stage() const { return stage_; }
 
  std::optional<std::string_view> diagnostic_stage_name() const override;
 
 private:
  stdx::expected<Processor::Result, std::error_code> greeting();
  stdx::expected<Processor::Result, std::error_code> command();
 
  Stage stage_{Stage::Greeting};
};
 
#endif  // ROUTING_SRC_PROCESSORS_SESSION_CLASSIC_FLOW_H_