query_version.h

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/*
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  it under the terms of the GNU General Public License, version 2.0,
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  You should have received a copy of the GNU General Public License
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*/
 
#ifndef ROUTER_SRC_REST_MRS_SRC_MRS_DATABASE_QUERY_VERSION_H_
#define ROUTER_SRC_REST_MRS_SRC_MRS_DATABASE_QUERY_VERSION_H_
 
#include <array>
 
#include "mrs/database/entry/auth_user.h"
#include "mrs/database/helper/query.h"
 
namespace mrs {
namespace database {
 
struct MrsSchemaVersion {
  int major{0};
  int minor{0};
  int patch{0};
 
  bool is_compatible(
      std::initializer_list<MrsSchemaVersion> accepted_versions) const {
    for (const auto &other : accepted_versions) {
      if (major == other.major) {
        return true;
      }
    }
 
    return false;
  }
 
  bool operator==(const MrsSchemaVersion &o) const {
    return major == o.major && minor == o.minor && patch == o.patch;
  }
 
  bool operator!=(const MrsSchemaVersion &o) const { return !operator==(o); }
 
  bool operator<(const MrsSchemaVersion &o) const {
    if (major == o.major) {
      if (minor == o.minor) {
        return patch < o.patch;
      } else {
        return minor < o.minor;
      }
    } else {
      return major < o.major;
    }
  }
 
  std::string str() const {
    return std::to_string(major) + "." + std::to_string(minor) + "." +
           std::to_string(patch);
  }
};
 
class QueryVersion : private Query {
 public:
  MrsSchemaVersion query_version(MySQLSession *session);
 
 private:
  void on_metadata(unsigned number, MYSQL_FIELD *fields) override;
  void on_row(const ResultRow &r) override;
  MrsSchemaVersion v_;
};
 
constexpr MrsSchemaVersion kCurrentMrsMetadataVersion{4, 0, 0};
 
constexpr MrsSchemaVersion kSchemaUpgradeMrsMetadataVersion{0, 0, 0};
 
constexpr std::initializer_list<MrsSchemaVersion>
    kCompatibleMrsMetadataVersions{mrs::database::kCurrentMrsMetadataVersion,
                                   {2, 2}};
 
}  // namespace database
}  // namespace mrs
 
#endif  // ROUTER_SRC_REST_MRS_SRC_MRS_DATABASE_QUERY_VERSION_H_