language_service.h

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/* Copyright (c) 2022, 2024, 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.
 
This program is designed to work with certain software (including
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as designated in a particular file or component or in included license
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the program or referenced in the documentation.
 
This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License, version 2.0, for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef LANGUAGE_SERVICE_GUARD
#define LANGUAGE_SERVICE_GUARD
 
#include "mysql/components/service.h"
#include "mysql/components/services/bits/thd.h"
#include "mysql/components/services/defs/mysql_string_defs.h"
 
/**
  The handle is created by the caller of
  external_program_execution service.
 
  It is guaranteed to be available only during the execution of
  external_program_execution service API's methods.
*/
DEFINE_SERVICE_HANDLE(external_program_handle);
 
/**
  The handle is an opaque pointer to a sp_head item.
*/
DEFINE_SERVICE_HANDLE(stored_program_handle);
 
/**
  The handle is an opaque pointer to the Stored Program's statement state.
*/
DEFINE_SERVICE_HANDLE(stored_program_statement_handle);
 
/**
  @ingroup group_components_services_inventory
 
  A service to query various properties/capabilities of the implementer of
  @ref s_mysql_external_program_execution service.
*/
BEGIN_SERVICE_DEFINITION(external_program_capability_query)
 
/**
  Retrieve capability information
 
  Supported capabilities and value type
 
  capability: "supports_language"
  property: "<language>"
  value: Boolean (true - Supported, false - Not supported)
 
  @param [in]     capability Capability name (see description above)
  @param [in,out] property   Capability's property (may be null)
                             Must be one of the capability's
                             supported properties.
  @param [out]    value      Implementation's capability/property information
 
  @returns Status
    @retval false Success
    @retval true  Error
*/
DECLARE_BOOL_METHOD(get, (const char *capability, char *property, void *value));
 
END_SERVICE_DEFINITION(external_program_capability_query)
 
/**
  @ingroup group_components_services_inventory
 
  A service to setup and execute multi-lingual stored procedures
*/
BEGIN_SERVICE_DEFINITION(external_program_execution)
/**
  Create and initialize stored program state if language is supported.
 
  @param [in]  sp           The stored program used for associating
                            language sp state.
  @param [in]  sp_statement The statement where this stored program
                            is created (optional).
  @param [out] lang_sp      external program pointer if created,
                            nullptr otherwise.
  @return status of initialization
    @retval false Success
    @retval true  Error
*/
DECLARE_BOOL_METHOD(init, (stored_program_handle sp,
                           stored_program_statement_handle sp_statement,
                           external_program_handle *lang_sp));
 
/**
  Deinits and cleans up stored program state.
 
  @param [in] thd     (optional) The THD this stored program was attached to.
  @param [in] lang_sp (optional) The stored program state to clean up.
  @param [in] sp      (optional) The stored program used for associating
                                 language sp state when lang_sp was created.
  @note: At least one of lang_sp or sp should be provided.
  @returns status of de-initialization
    @retval false Success
    @retval true  Error
*/
DECLARE_BOOL_METHOD(deinit, (MYSQL_THD thd, external_program_handle lang_sp,
                             stored_program_handle sp));
 
/**
  Parse given external program
 
  @param [in] lang_sp      The stored program state
  @param [in] sp_statement The statement where this stored program
                           is parsed (optional).
  @returns Status of parsing
    @retval false Success
    @retval true  Error
*/
DECLARE_BOOL_METHOD(parse, (external_program_handle lang_sp,
                            stored_program_statement_handle sp_statement));
 
/**
  Execute given external program
 
  @param [in] lang_sp      The stored program state
  @param [in] sp_statement The statement where this stored program
                           is executed (optional).
  @returns Status of execution
    @retval false Success
    @retval true  Error
*/
DECLARE_BOOL_METHOD(execute, (external_program_handle lang_sp,
                              stored_program_statement_handle sp_statement));
 
END_SERVICE_DEFINITION(external_program_execution)
 
/**
  @ingroup group_components_services_inventory
 
  A service to parse library code
*/
BEGIN_SERVICE_DEFINITION(external_library)
 
/**
  Check if the language of the library is supported
 
  @param [in]  language   Language of the library source code
  @param [out] result     Returns true if the language is supported
 
  @return Status of the performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(is_language_supported,
                    (mysql_cstring_with_length language, bool *result));
 
/**
  Parses library code.
 
  @param [in]  name       Name of the library
  @param [in]  language   Language of the library source code
  @param [in]  body       Library's source code in UTF8MB4 charset
 
  @return Status of the performed operation
  @retval false success
  @retval true failure
*/
DECLARE_BOOL_METHOD(parse, (mysql_cstring_with_length name,
                            mysql_cstring_with_length language,
                            mysql_cstring_with_length body));
 
END_SERVICE_DEFINITION(external_library)
 
#endif /* LANGUAGE_SERVICE_GUARD */