keyring_reader_service_impl_template.h

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#ifndef KEYRING_READER_SERVICE_IMPL_TEMPLATE_INCLUDED
#define KEYRING_READER_SERVICE_IMPL_TEMPLATE_INCLUDED
 
#include <functional> /* std::function */
#include <sstream>
 
#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>
#include <components/keyrings/common/data/data.h>
#include <components/keyrings/common/data/meta.h>
#include <components/keyrings/common/memstore/iterator.h>
#include <components/keyrings/common/operations/operations.h>
 
using keyring_common::data::Data;
using keyring_common::iterator::Iterator;
using keyring_common::meta::Metadata;
using keyring_common::operations::Keyring_operations;
 
namespace keyring_common {
namespace service_implementation {
 
/**
  Initialize reader
 
  @param [in]  data_id             Data Identifier
  @param [in]  auth_id             Authorization ID
  @param [out] it                  Iterator
  @param [in]  keyring_operations  Reference to the object
                                   that handles cache and backend
  @param [in]  callbacks           Handle to component specific callbacks
 
  @returns status of the operation
    @retval -1 Keyring error. reader_object will not be created.
    @retval  0 Key not found OR error fetching keys.
               reader_object will not be created.
    @retval  1 Key found, check out parameters
*/
template <typename Backend, typename Data_extension = data::Data>
int init_reader_template(
    const char *data_id, const char *auth_id,
    std::unique_ptr<Iterator<Data_extension>> &it,
    Keyring_operations<Backend, Data_extension> &keyring_operations,
    Component_callbacks &callbacks) {
  try {
    if (callbacks.keyring_initialized() == false) {
      return -1;
    }
 
    if (data_id == nullptr || !*data_id) {
      assert(false);
      return 0;
    }
 
    Metadata metadata(data_id, auth_id);
    if (keyring_operations.init_read_iterator(it, metadata) == true) {
      return 0;
    }
 
    if (keyring_operations.is_valid(it) == false) {
      LogComponentErr(INFORMATION_LEVEL,
                      ER_NOTE_KEYRING_COMPONENT_READ_DATA_NOT_FOUND, data_id,
                      (auth_id == nullptr || !*auth_id) ? "NULL" : auth_id);
      keyring_operations.deinit_forward_iterator(it);
      return 0;
    }
 
    return 1;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "init",
                    "keyring_reader_with_status");
    return -1;
  }
}
 
/**
  Deinitialize reader
 
  @param [in, out] it                  Iterator
  @param [in]      keyring_operations  Reference to the object
                                       that handles cache and backend
  @param [in]      callbacks           Handle to component specific callbacks
 
  @returns status of the operation
    @retval false Success
    @retval true  Failure
*/
 
template <typename Backend, typename Data_extension = data::Data>
bool deinit_reader_template(
    std::unique_ptr<Iterator<Data_extension>> &it,
    Keyring_operations<Backend, Data_extension> &keyring_operations,
    Component_callbacks &callbacks) {
  try {
    if (callbacks.keyring_initialized() == false) {
      return true;
    }
    keyring_operations.deinit_forward_iterator(it);
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "deinit",
                    "keyring_reader_with_status");
    return true;
  }
}
 
/**
  Fetch length of the data
 
  @param [in]  it                 Iterator
  @param [out] data_size          Size of fetched data
  @param [out] data_type_size     Size of data type
  @param [in]  keyring_operations Reference to the object
                                  that handles cache and backend
  @param [in]  callbacks          Handle to component specific callbacks
  @returns status of the operation
    @retval false Success
    @retval true  Failure
*/
template <typename Backend, typename Data_extension = data::Data>
bool fetch_length_template(
    std::unique_ptr<Iterator<Data_extension>> &it, size_t *data_size,
    size_t *data_type_size,
    Keyring_operations<Backend, Data_extension> &keyring_operations,
    Component_callbacks &callbacks) {
  try {
    if (callbacks.keyring_initialized() == false) {
      return true;
    }
 
    if (data_size == nullptr || data_type_size == nullptr) {
      assert(false);
      return true;
    }
 
    Data_extension data;
    Metadata metadata;
    if (keyring_operations.get_iterator_data(it, metadata, data) == true) {
      return true;
    }
 
    *data_size = data.data().length();
    *data_type_size = data.type().length();
    return false;
  } catch (...) {
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "fetch_length",
                    "keyring_reader_with_status");
    return true;
  }
}
 
/**
  Fetches data from keyring
 
  @param [in]  it                      Iterator
  @param [out] data_buffer             Out buffer for data
  @param [in]  data_buffer_length      Length of out buffer
  @param [out] data_size               Size of fetched data
  @param [out] data_type_buffer        Type of data
  @param [in]  data_type_buffer_length Length of data type buffer
  @param [out] data_type_size          Size of data type
  @param [in]  keyring_operations      Reference to the object
                                       that handles cache and backend
  @param [in]  callbacks               Handle to component specific callbacks
 
  @returns status of the operation
    @retval false Success
    @retval true  Failure
*/
template <typename Backend, typename Data_extension = data::Data>
bool fetch_template(
    std::unique_ptr<Iterator<Data_extension>> &it, unsigned char *data_buffer,
    size_t data_buffer_length, size_t *data_size, char *data_type_buffer,
    size_t data_type_buffer_length, size_t *data_type_size,
    Keyring_operations<Backend, Data_extension> &keyring_operations,
    Component_callbacks &callbacks) {
  try {
    if (callbacks.keyring_initialized() == false) {
      return true;
    }
 
    Data_extension data;
    Metadata metadata;
    if (keyring_operations.get_iterator_data(it, metadata, data) == true) {
      return true;
    }
 
    if (data_buffer_length < data.data().length() || data_buffer == nullptr) {
      assert(false);
      return true;
    }
 
    if (data_type_buffer_length < data.type().length() ||
        data_type_buffer == nullptr) {
      assert(false);
      return true;
    }
 
    memset(data_buffer, 0, data_buffer_length);
    memset(data_type_buffer, 0, data_type_buffer_length);
 
    memcpy(data_buffer, data.data().c_str(), data.data().length());
    *data_size = data.data().length();
 
    memcpy(data_type_buffer, data.type().c_str(), data.type().length());
    *data_type_size = data.type().length();
 
    return false;
  } catch (...) {
    memset(data_buffer, 0, data_buffer_length);
    memset(data_type_buffer, 0, data_type_buffer_length);
    LogComponentErr(ERROR_LEVEL, ER_KEYRING_COMPONENT_EXCEPTION, "fetch",
                    "keyring_reader_with_status");
    return true;
  }
}
 
}  // namespace service_implementation
}  // namespace keyring_common
 
#endif  // KEYRING_READER_SERVICE_IMPL_TEMPLATE_INCLUDED