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128 lines
3.8 KiB
128 lines
3.8 KiB
#ifndef SERVICES_INCLUDED
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#define SERVICES_INCLUDED
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/* Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file plugin/rewriter/services.h
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Conversion layer between the parser service and this plugin. This plugin is
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written in C++, while the parser service is written in C.
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The layer handles:
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- Copying between server and plugin memory. This is necessary on some
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platforms (e.g. Windows) where dynamicly linked libraries have their own
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heap.
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- Wrapping raw const char * in std::string classes.
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*/
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#include <mysql/service_parser.h>
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#include <string>
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#include <vector>
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#include "my_inttypes.h"
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namespace services {
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class Session {
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public:
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Session(MYSQL_THD current_session);
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MYSQL_THD thd() { return m_current_session; }
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private:
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MYSQL_THD m_previous_session;
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MYSQL_THD m_current_session;
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};
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class Digest {
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uchar m_buf[PARSER_SERVICE_DIGEST_LENGTH];
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public:
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/**
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Copies the digest buffer from the server.
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@retval false Server reported success.
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@retval true Server reported failure.
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*/
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bool load(MYSQL_THD thd);
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/// Needed because we use a C hash table to store digests.
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const uchar *c_ptr() const { return m_buf; }
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};
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class Literal_visitor {
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public:
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virtual ~Literal_visitor() {}
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virtual bool visit(MYSQL_ITEM item) = 0;
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};
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/**
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This class may inherited and passed to parse() in order to handle conditions
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raised by the server.
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*/
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class Condition_handler {
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public:
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/**
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This function will be called by the server via this API before raising a
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condition. The Condition_handler subclass may then decide to handle the
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condition by returning true, in which case the server does not raise it.
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@param sql_errno The condition number.
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@param sqlstate The SQLSTATE, allocated in the server.
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@param message The condition's message, allocated in the server.
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@retval true The condition is handled entirely by this object.
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@retval false The condition is not handled.
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*/
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virtual bool handle(int sql_errno, const char *sqlstate,
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const char *message) = 0;
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virtual ~Condition_handler() = 0;
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};
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std::string print_digest(const uchar *digest);
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void set_current_database(MYSQL_THD thd, const std::string &db);
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bool parse(MYSQL_THD thd, const std::string &query, bool is_prepared,
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Condition_handler *handler);
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bool parse(MYSQL_THD thd, const std::string &query, bool is_prepared);
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bool is_supported_statement(MYSQL_THD thd);
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int get_number_params(MYSQL_THD thd);
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bool visit_parse_tree(MYSQL_THD thd, Literal_visitor *visitor);
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/// Prints an Item as an std::string.
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std::string print_item(MYSQL_ITEM item);
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std::string get_current_query_normalized(MYSQL_THD thd);
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std::vector<int> get_parameter_positions(MYSQL_THD thd);
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} // namespace services
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#endif // SERVICES_INCLUDED
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