classic_stmt_prepare_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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  as designated in a particular file or component or in included license
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  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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  You should have received a copy of the GNU General Public License
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*/
 
#ifndef ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_STMT_PREPARE_FORWARDER_H_
#define ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_STMT_PREPARE_FORWARDER_H_
 
#include "processors/base/forwarding_processor.h"
 
#include "mysqlrouter/classic_prepared_statement.h"
 
class StmtPrepareForwarder : public ForwardingProcessor {
 public:
  using ForwardingProcessor::ForwardingProcessor;
 
  enum class Stage {
    Command,
 
    ForbidCommand,
 
    PrepareBackend,
 
    Connect,
    Connected,
    Forward,
    ForwardDone,
    Response,
    Column,
    EndOfColumns,
    Param,
    EndOfParams,
    Ok,
    OkDone,
    Error,
    Done,
  };
 
  static std::string_view prefix() { return "mysql/stmt_prepare"; }
 
  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> forbid_command();
  stdx::expected<Result, std::error_code> prepare_backend();
  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> column();
  stdx::expected<Result, std::error_code> end_of_columns();
  stdx::expected<Result, std::error_code> param();
  stdx::expected<Result, std::error_code> end_of_params();
  stdx::expected<Result, std::error_code> ok_done();
  stdx::expected<Result, std::error_code> error();
 
  bool has_more_messages() const;
 
  Stage stage_{Stage::Command};
 
  size_t columns_left_{0};
  size_t params_left_{0};
 
  uint16_t stmt_id_{};
  PreparedStatement prep_stmt_{};
 
  TraceEvent *trace_event_command_{nullptr};
  TraceEvent *trace_event_connect_and_forward_command_{nullptr};
  TraceEvent *trace_event_forward_command_{nullptr};
};
 
#endif  // ROUTING_SRC_PROCESSORS_FORWARDERS_CLASSIC_STMT_PREPARE_FORWARDER_H_