91e36ecaed
The operation of the statement to be prepared is no longer reported as the operation of the PREPARE statement. Instead, when the type of the statement is QUERY_TYPE_PREPARE_NAMED_STMT, the operation can be obtained using qc_get_prepare_operation(). The qc_mysqlembedded implementation will be provided in a subsequent commit.
420 lines
14 KiB
C
420 lines
14 KiB
C
#pragma once
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-07-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <maxscale/cdefs.h>
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#include <maxscale/buffer.h>
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MXS_BEGIN_DECLS
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#define QUERY_CLASSIFIER_VERSION {1, 1, 0}
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/**
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* qc_query_type_t defines bits that provide information about a
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* particular statement.
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*
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* Note that more than one bit may be set for a single statement.
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*/
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typedef enum qc_query_type
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{
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QUERY_TYPE_UNKNOWN = 0x000000, /*< Initial value, can't be tested bitwisely */
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QUERY_TYPE_LOCAL_READ = 0x000001, /*< Read non-database data, execute in MaxScale:any */
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QUERY_TYPE_READ = 0x000002, /*< Read database data:any */
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QUERY_TYPE_WRITE = 0x000004, /*< Master data will be modified:master */
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QUERY_TYPE_MASTER_READ = 0x000008, /*< Read from the master:master */
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QUERY_TYPE_SESSION_WRITE = 0x000010, /*< Session data will be modified:master or all */
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/** Not implemented yet */
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//QUERY_TYPE_USERVAR_WRITE = 0x000020, /*< Write a user variable:master or all */
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QUERY_TYPE_USERVAR_READ = 0x000040, /*< Read a user variable:master or any */
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QUERY_TYPE_SYSVAR_READ = 0x000080, /*< Read a system variable:master or any */
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/** Not implemented yet */
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//QUERY_TYPE_SYSVAR_WRITE = 0x000100, /*< Write a system variable:master or all */
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QUERY_TYPE_GSYSVAR_READ = 0x000200, /*< Read global system variable:master or any */
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QUERY_TYPE_GSYSVAR_WRITE = 0x000400, /*< Write global system variable:master or all */
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QUERY_TYPE_BEGIN_TRX = 0x000800, /*< BEGIN or START TRANSACTION */
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QUERY_TYPE_ENABLE_AUTOCOMMIT = 0x001000, /*< SET autocommit=1 */
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QUERY_TYPE_DISABLE_AUTOCOMMIT = 0x002000, /*< SET autocommit=0 */
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QUERY_TYPE_ROLLBACK = 0x004000, /*< ROLLBACK */
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QUERY_TYPE_COMMIT = 0x008000, /*< COMMIT */
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QUERY_TYPE_PREPARE_NAMED_STMT = 0x010000, /*< Prepared stmt with name from user:all */
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QUERY_TYPE_PREPARE_STMT = 0x020000, /*< Prepared stmt with id provided by server:all */
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QUERY_TYPE_EXEC_STMT = 0x040000, /*< Execute prepared statement:master or any */
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QUERY_TYPE_CREATE_TMP_TABLE = 0x080000, /*< Create temporary table:master (could be all) */
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QUERY_TYPE_READ_TMP_TABLE = 0x100000, /*< Read temporary table:master (could be any) */
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QUERY_TYPE_SHOW_DATABASES = 0x200000, /*< Show list of databases */
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QUERY_TYPE_SHOW_TABLES = 0x400000 /*< Show list of tables */
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} qc_query_type_t;
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/**
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* qc_query_op_t defines the operations a particular statement can perform.
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*/
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typedef enum qc_query_op
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{
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QUERY_OP_UNDEFINED = 0,
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QUERY_OP_SELECT = (1 << 0),
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QUERY_OP_UPDATE = (1 << 1),
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QUERY_OP_INSERT = (1 << 2),
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QUERY_OP_DELETE = (1 << 3),
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QUERY_OP_TRUNCATE = (1 << 4),
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QUERY_OP_ALTER = (1 << 5),
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QUERY_OP_CREATE = (1 << 6),
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QUERY_OP_DROP = (1 << 7),
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QUERY_OP_CHANGE_DB = (1 << 8),
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QUERY_OP_LOAD = (1 << 9),
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QUERY_OP_GRANT = (1 << 10),
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QUERY_OP_REVOKE = (1 << 11)
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} qc_query_op_t;
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/**
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* qc_parse_result_t defines the possible outcomes when a statement is parsed.
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*/
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typedef enum qc_parse_result
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{
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QC_QUERY_INVALID = 0, /*< The query was not recognized or could not be parsed. */
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QC_QUERY_TOKENIZED = 1, /*< The query was classified based on tokens; incompletely classified. */
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QC_QUERY_PARTIALLY_PARSED = 2, /*< The query was only partially parsed; incompletely classified. */
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QC_QUERY_PARSED = 3 /*< The query was fully parsed; completely classified. */
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} qc_parse_result_t;
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/**
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* QUERY_CLASSIFIER defines the object a query classifier plugin must
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* implement and return.
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*
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* To a user of the query classifier functionality, it can in general
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* be ignored.
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*/
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typedef struct query_classifier
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{
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bool (*qc_init)(const char* args);
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void (*qc_end)(void);
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bool (*qc_thread_init)(void);
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void (*qc_thread_end)(void);
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qc_parse_result_t (*qc_parse)(GWBUF* stmt);
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uint32_t (*qc_get_type)(GWBUF* stmt);
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qc_query_op_t (*qc_get_operation)(GWBUF* stmt);
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char* (*qc_get_created_table_name)(GWBUF* stmt);
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bool (*qc_is_drop_table_query)(GWBUF* stmt);
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bool (*qc_is_real_query)(GWBUF* stmt);
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char** (*qc_get_table_names)(GWBUF* stmt, int* tblsize, bool fullnames);
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char* (*qc_get_canonical)(GWBUF* stmt);
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bool (*qc_query_has_clause)(GWBUF* stmt);
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char* (*qc_get_affected_fields)(GWBUF* stmt);
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char** (*qc_get_database_names)(GWBUF* stmt, int* size);
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char* (*qc_get_prepare_name)(GWBUF* stmt);
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qc_query_op_t (*qc_get_prepare_operation)(GWBUF* stmt);
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} QUERY_CLASSIFIER;
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/**
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* Loads and initializes the default query classifier.
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*
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* This must be called once during the execution of a process. The query
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* classifier functions can only be used if this function returns true.
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* MaxScale calls this function, so plugins should not do that.
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*
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* @param plugin_name The name of the plugin from which the query classifier
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* should be loaded.
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* @param plugin_args The arguments to be provided to the query classifier.
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*
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* @return True if the query classifier could be loaded and initialized,
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* false otherwise.
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*
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* @see qc_end qc_thread_init
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*/
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bool qc_init(const char* plugin_name, const char* plugin_args);
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/**
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* Finalizes and unloads the query classifier.
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*
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* A successful call of qc_init() should before program exit be followed
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* by a call to this function. MaxScale calls this function, so plugins
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* should not do that.
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*
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* @see qc_init qc_thread_end
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*/
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void qc_end(void);
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/**
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* Loads a particular query classifier.
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*
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* In general there is no need to use this function, but rely upon qc_init().
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* However, if there is a need to use multiple query classifiers concurrently
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* then this function provides the means for that. Note that after a query
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* classifier has been loaded, it must explicitly be initialized before it
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* can be used.
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*
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* @param plugin_name The name of the plugin from which the query classifier
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* should be loaded.
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*
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* @return A QUERY_CLASSIFIER object if successful, NULL otherwise.
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*
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* @see qc_unload
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*/
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QUERY_CLASSIFIER* qc_load(const char* plugin_name);
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/**
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* Unloads an explicitly loaded query classifier.
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*
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* @see qc_load
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*/
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void qc_unload(QUERY_CLASSIFIER* classifier);
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/**
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* Performs thread initialization needed by the query classifier.
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* Should be called in every thread, except the one where qc_init()
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* was called. MaxScale calls this function, so plugins should not
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* do that.
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*
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* @return True if the initialization succeeded, false otherwise.
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*
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* @see qc_thread_end
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*/
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bool qc_thread_init(void);
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/**
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* Performs thread finalization needed by the query classifier.
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* A successful call to qc_thread_init() should at some point be followed
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* by a call to this function. MaxScale calls this function, so plugins
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* should not do that.
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*
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* @see qc_thread_init
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*/
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void qc_thread_end(void);
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/**
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* Parses the statement in the provided buffer and returns a value specifying
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* to what extent the statement could be parsed.
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*
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* There is no need to call this function explicitly before calling any of
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* the other functions; e.g. qc_get_type(). When some particular property of
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* a statement is asked for, the statement will be parsed if it has not been
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* parsed yet. Also, if the statement in the provided buffer has been parsed
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* already then this function will only return the result of that parsing;
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* the statement will not be parsed again.
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*
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* @param stmt A buffer containing an COM_QUERY packet.
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*
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* @return To what extent the statement could be parsed.
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*/
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qc_parse_result_t qc_parse(GWBUF* stmt);
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/**
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* Returns the fields the statement affects, as a string of names separated
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* by spaces. Note that the fields do not contain any table information.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return A string containing the fields or NULL if a memory allocation
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* failure occurs. The string must be freed by the caller.
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*/
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char* qc_get_affected_fields(GWBUF* stmt);
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/**
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* Returns the statement, with literals replaced with question marks.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return A statement in its canonical form, or NULL if a memory
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* allocation fails. The string must be freed by the caller.
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*/
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char* qc_get_canonical(GWBUF* stmt);
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/**
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* Returns the name of the created table.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return The name of the created table or NULL if the statement
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* does not create a table or a memory allocation failed.
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* The string must be freed by the caller.
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*/
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char* qc_get_created_table_name(GWBUF* stmt);
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/**
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* Returns the databases accessed by the statement. Note that a
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* possible default database is not returned.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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* @param size Pointer to integer where the number of databases
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* is stored.
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*
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* @return Array of strings or NULL if a memory allocation fails.
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*
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* @note The returned array and the strings pointed to @b must be freed
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* by the caller.
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*/
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char** qc_get_database_names(GWBUF* stmt, int* size);
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/**
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* Returns the operation of the statement.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return The operation of the statement.
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*/
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qc_query_op_t qc_get_operation(GWBUF* stmt);
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/**
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* Returns the name of the prepared statement, if the statement
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* is a PREPARE or EXECUTE statement.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return The name of the prepared statement, if the statement
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* is a PREPARE or EXECUTE statement; otherwise NULL.
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*
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* @note The returned string @b must be freed by the caller.
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*
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* @note Even though a COM_STMT_PREPARE can be given to the query
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* classifier for parsing, this function will in that case
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* return NULL since the id of the statement is provided by
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* the server.
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*/
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char* qc_get_prepare_name(GWBUF* stmt);
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/**
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* Returns the operator of the prepared statement, if the statement
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* is a PREPARE statement.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return The operator of the prepared statement, if the statement
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* is a PREPARE statement; otherwise QUERY_OP_UNDEFINED.
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*/
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qc_query_op_t qc_get_prepare_operation(GWBUF* stmt);
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/**
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* Returns the tables accessed by the statement.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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* @param tblsize Pointer to integer where the number of tables is stored.
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* @param fullnames If true, a table names will include the database name
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* as well (if explicitly referred to in the statement).
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*
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* @return Array of strings or NULL if a memory allocation fails.
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*
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* @note The returned array and the strings pointed to @b must be freed
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* by the caller.
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*/
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char** qc_get_table_names(GWBUF* stmt, int* size, bool fullnames);
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/**
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* Returns a bitmask specifying the type(s) of the statement. The result
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* should be tested against specific qc_query_type_t values* using the
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* bitwise & operator, never using the == operator.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return A bitmask with the type(s) the query.
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*
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* @see qc_query_is_type
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*/
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uint32_t qc_get_type(GWBUF* stmt);
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/**
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* Returns whether the statement is a DROP TABLE statement.
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*
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* @param stmt A buffer containing a COM_QUERY packet.
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*
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* @return True if the statement is a DROP TABLE statement, false otherwise.
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*
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* @todo This function is far too specific.
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*/
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bool qc_is_drop_table_query(GWBUF* stmt);
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/**
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* Returns whether the statement is a "real" statement. Statements that affect
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* the underlying database are considered real statements, while statements that
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* target specific rows or variable data are regarded as real statement. That is,
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* a real statement is SELECT, UPDATE, INSERT, DELETE or a variation thereof.
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*
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* @param stmt A buffer containing a COM_QUERY.
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*
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* @return True if the statement is a real query, false otherwise.
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*
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* @todo Consider whether the function name should be changed or the function
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* removed altogether.
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*/
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bool qc_is_real_query(GWBUF* stmt);
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/**
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* Returns the string representation of a query operation.
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*
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* @param op A query operation.
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*
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* @return The corresponding string.
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*
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* @note The returned string is statically allocated and must *not* be freed.
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*/
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const char* qc_op_to_string(qc_query_op_t op);
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/**
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* Returns whether the typemask contains a particular type.
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*
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* @param typemask A bitmask of query types.
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* @param type A particular qc_query_type_t value.
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*
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* @return True, if the type is in the mask.
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*/
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static inline bool qc_query_is_type(uint32_t typemask, qc_query_type_t type)
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{
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return (typemask & type) == type;
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}
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/**
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* Returns whether the statement has a WHERE or a USING clause.
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*
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* @param stmt A buffer containing a COM_QUERY.
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*
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* @return True, if the statement has a WHERE or USING clause, false
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* otherwise.
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*/
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bool qc_query_has_clause(GWBUF* stmt);
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/**
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* Returns the string representation of a query type.
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*
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* @param type A query type (not a bitmask of several).
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*
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* @return The corresponding string.
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*
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* @note The returned string is statically allocated and must @b not be freed.
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*/
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const char* qc_type_to_string(qc_query_type_t type);
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/**
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* Returns a string representation of a type bitmask.
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*
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* @param typemask A bit mask of query types.
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*
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* @return The corresponding string or NULL if the allocation fails.
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*
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* @note The returned string is dynamically allocated and @b must be freed.
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*/
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char* qc_typemask_to_string(uint32_t typemask);
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/**
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* @deprecated
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* Synonym for qc_query_is_type().
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*
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* @see qc_query_is_type
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*/
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#define QUERY_IS_TYPE(typemask, type) qc_query_is_type(typemask, type)
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MXS_END_DECLS
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