keyring_metadata_query_service_impl_template.h

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#ifndef KEYRING_METADATA_QUERY_SERVICE_IMPL_TEMPLATE_INCLUDED
#define KEYRING_METADATA_QUERY_SERVICE_IMPL_TEMPLATE_INCLUDED
 
#include <cstring>
#include <functional>
#include <memory>
 
#include <my_dbug.h>
#include <mysql/components/services/log_builtins.h> /* LogComponentErr */
#include <mysqld_error.h>
 
#include <components/keyrings/common/component_helpers/include/service_requirements.h>
 
namespace keyring_common {
namespace service_implementation {
 
/**
  Returns status of the keyring component
 
  @param [in] callbacks Component specific callbacks
 
  @returns Status of keyring
    @retval true  Initialized
    @retval false Not initialized
*/
bool keyring_metadata_query_keyring_initialized_template(
    Component_callbacks &callbacks) {
  return callbacks.keyring_initialized();
}
 
/**
  Initialize metadata iterator
 
  @param [out] it         Metadata iterator handle
  @param [in]  callbacks  Component callback handle
 
  @returns Status of iterator initialization
    @retval false Success
    @retval true  Failure. Check error state.
*/
bool keyring_metadata_query_init_template(std::unique_ptr<config_vector> &it,
                                          Component_callbacks &callbacks) {
  try {
    return callbacks.create_config(it);
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "init",
                    "keyring_component_metadata_query");
    return true;
  }
}
 
/**
  Deinitialize metadata iterator
 
  @param [in, out] it          Metadata iterator handle
 
  @returns Status of iterator deinitialization
    @retval false Success
    @retval true  Failure. Check error state.
*/
bool keyring_metadata_query_deinit_template(
    std::unique_ptr<config_vector> &it) {
  try {
    it.reset(nullptr);
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "deinit",
                    "keyring_component_metadata_query");
    return true;
  }
}
 
/**
  Check validity of iterator
 
  @param [in] it Metadata iterator handle
 
  @returns Validity of the the iterator
    @retval true  Iterator valid
    @retval false Iterator invalid
*/
bool keyring_metadata_query_is_valid_template(
    std::unique_ptr<config_vector> &it) {
  try {
    return ((it.get() != nullptr) && (it.get()->size() > 0));
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "is_valid",
                    "keyring_component_metadata_query");
    return false;
  }
}
 
/**
  Move iterator forward
 
  @param [in, out] it          Metadata iterator handle
 
  @returns Status of operation
    @retval false Success
    @retval true  Failure.
*/
bool keyring_metadata_query_next_template(std::unique_ptr<config_vector> &it) {
  try {
    if (it.get()->size() == 0) {
      return true;
    }
    it.get()->erase(it.get()->begin());
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "next",
                    "keyring_component_metadata_query");
    return true;
  }
}
 
/**
  Get length information about metadata key and value
 
  @param [in]  it                  Metadata iterator handle
  @param [out] key_buffer_length   Length of the key buffer
  @param [out] value_buffer_length Length of the value buffer
 
  @returns Get length information about key and value
    @retval false Success check out parameters
    @retval true  Error
*/
bool keyring_metadata_query_get_length_template(
    std::unique_ptr<config_vector> &it, size_t *key_buffer_length,
    size_t *value_buffer_length) {
  try {
    if (it->size() == 0) {
      return true;
    }
 
    if (key_buffer_length == nullptr || value_buffer_length == nullptr) {
      assert(false);
      return true;
    }
 
    auto key_value = (*it)[0];
 
    // Account for null termination
    *key_buffer_length = key_value.first.length() + 1;
    *value_buffer_length = key_value.second.length() + 1;
 
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "get_length",
                    "keyring_component_metadata_query");
    return true;
  }
}
 
/**
  Get name and value of metadata at current position
 
  @param [out] key_buffer          Output buffer for key
  @param [in]  key_buffer_length   Length of key buffer
  @param [out] value_buffer        Output buffer for value
  @param [in]  value_buffer_length Length of value buffer
  @param [in]  it                  Metadata iterator handle
 
  @returns Status of fetch operation
    @retval false Success
    @retval true  Failure. Check error state.
*/
bool keyring_metadata_query_get_template(char *key_buffer,
                                         size_t key_buffer_length,
                                         char *value_buffer,
                                         size_t value_buffer_length,
                                         std::unique_ptr<config_vector> &it) {
  try {
    if (it->size() == 0) {
      return true;
    }
 
    auto key_value = (*it)[0];
 
    if (key_value.first.length() >= key_buffer_length) {
      assert(false);
      return true;
    }
 
    if (key_value.second.length() >= value_buffer_length) {
      assert(false);
      return true;
    }
 
    memcpy(key_buffer, key_value.first.c_str(), key_value.first.length());
    key_buffer[key_value.first.length()] = '\0';
    memcpy(value_buffer, key_value.second.c_str(), key_value.second.length());
    value_buffer[key_value.second.length()] = '\0';
 
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "get",
                    "keyring_component_metadata_query");
    return true;
  }
}
 
}  // namespace service_implementation
}  // namespace keyring_common
#endif  // !KEYRING_METADATA_QUERY_SERVICE_IMPL_TEMPLATE_INCLUDED