classic_stmt_execute_forwarder.h

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/*
  Copyright (c) 2023, 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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*/
 
#ifndef ROUTING_CLASSIC_STMT_EXECUTE_FORWARDER_INCLUDED
#define ROUTING_CLASSIC_STMT_EXECUTE_FORWARDER_INCLUDED
 
#include "forwarding_processor.h"
 
class StmtExecuteForwarder : public ForwardingProcessor {
 public:
  using ForwardingProcessor::ForwardingProcessor;
 
  enum class Stage {
    Command,
    Forward,
    ForwardDone,
    Response,
    ColumnCount,
    Column,
    EndOfColumns,
    Row,
    EndOfRows,
    Ok,
    Error,
    Done,
  };
 
  static std::string_view prefix() { return "mysql/stmt_execute"; }
 
  stdx::expected<Result, std::error_code> process() override;
 
  void stage(Stage stage) { stage_ = stage; }
  Stage stage() const { return stage_; }
 
 private:
  stdx::expected<Result, std::error_code> command();
  stdx::expected<Result, std::error_code> forward();
  stdx::expected<Result, std::error_code> forward_done();
  stdx::expected<Result, std::error_code> response();
  stdx::expected<Result, std::error_code> column_count();
  stdx::expected<Result, std::error_code> column();
  stdx::expected<Result, std::error_code> end_of_columns();
  stdx::expected<Result, std::error_code> row();
  stdx::expected<Result, std::error_code> end_of_rows();
  stdx::expected<Result, std::error_code> ok();
  stdx::expected<Result, std::error_code> error();
 
  Stage stage_{Stage::Command};
 
  TraceEvent *trace_event_command_{};
  TraceEvent *trace_event_connect_and_forward_command_{};
  TraceEvent *trace_event_forward_command_{};
};
 
#endif