classic_init_schema_forwarder.h

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/*
  Copyright (c) 2023, 2026, 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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  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have either included with
  the program or referenced in the documentation.
 
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  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
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*/
 
#ifndef ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_INIT_SCHEMA_FORWARDER_H_
#define ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_INIT_SCHEMA_FORWARDER_H_
 
#include "processors/base/forwarding_processor.h"
 
class InitSchemaForwarder : public ForwardingProcessor {
 public:
  using ForwardingProcessor::ForwardingProcessor;
 
  enum class Stage {
    Command,
    Connect,
    Connected,
 
    Forward,
    ForwardDone,
 
    Response,
    Ok,
    Error,
    Done,
  };
 
  static std::string_view prefix() { return "mysql/init_schema"; }
 
  stdx::expected<Result, std::error_code> process() override;
 
  void stage(Stage stage) { stage_ = stage; }
  Stage stage() const { return stage_; }
 
  std::optional<std::string_view> diagnostic_stage_name() const override;
 
 private:
  stdx::expected<Result, std::error_code> command();
  stdx::expected<Result, std::error_code> connect();
  stdx::expected<Result, std::error_code> connected();
  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> 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  // ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_INIT_SCHEMA_FORWARDER_H_