228 lines
6.6 KiB
C++
228 lines
6.6 KiB
C++
/*
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Copyright (c) 2012, 2019, 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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#ifndef NDB_REPL_TAB_H
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#define NDB_REPL_TAB_H
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#include <assert.h>
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#include "my_inttypes.h"
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#include "mysql_com.h" /* NAME_CHAR_LEN */
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#include "storage/ndb/include/ndbapi/NdbApi.hpp"
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/*
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Ndb_rep_tab_key
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This class represents the key columns of the
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mysql.ndb_replication system table
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It is used when reading values from that table
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*/
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class Ndb_rep_tab_key {
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public:
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static const uint DB_MAXLEN = NAME_CHAR_LEN - 1;
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static const uint TABNAME_MAXLEN = NAME_CHAR_LEN - 1;
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/* Char arrays in varchar format with 1 length byte and
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* trailing 0
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*/
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char db[DB_MAXLEN + 2];
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char table_name[TABNAME_MAXLEN + 2];
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uint server_id;
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Ndb_rep_tab_key() {
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db[0] = 0;
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table_name[0] = 0;
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server_id = 0;
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}
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/* Constructor from normal null terminated strings */
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Ndb_rep_tab_key(const char *_db, const char *_table_name, uint _server_id);
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/* Add null terminators to VARCHAR format string values */
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void null_terminate_strings();
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const char *get_db() const { return &db[1]; }
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const char *get_table_name() const { return &table_name[1]; }
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static const int MIN_MATCH_VAL = 1;
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static const int EXACT_MATCH_DB = 4;
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static const int EXACT_MATCH_TABLE_NAME = 2;
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static const int EXACT_MATCH_SERVER_ID = 1;
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static const int EXACT_MATCH_QUALITY = MIN_MATCH_VAL + EXACT_MATCH_DB +
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EXACT_MATCH_TABLE_NAME +
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EXACT_MATCH_SERVER_ID;
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/*
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This static method attempts an exact, then a wild
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match between the passed key (with optional wild
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characters), and the passed candidate row
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returns :
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1 : Exact match
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0 : Wild match
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-1 : No match
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*/
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static int attempt_match(const char *keyptr, const uint keylen,
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const char *candidateptr, const uint candidatelen,
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const int exactmatchvalue);
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/* This static method compares a fixed key value with
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* a possibly wildcard containing candidate_row.
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* If there is no match, 0 is returned.
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* >0 means there is a match, with larger numbers
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* indicating a better match quality.
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* An exact match returns EXACT_MATCH_QUALITY
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*/
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static int get_match_quality(const Ndb_rep_tab_key *key,
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const Ndb_rep_tab_key *candidate_row);
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};
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/*
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Ndb_rep_tab_row
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This class represents a row in the mysql.ndb_replication table
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*/
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class Ndb_rep_tab_row {
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public:
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static const uint MAX_CONFLICT_FN_SPEC_LEN = 255;
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static const uint CONFLICT_FN_SPEC_BUF_LEN =
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MAX_CONFLICT_FN_SPEC_LEN + 1; /* Trailing '\0' */
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Ndb_rep_tab_key key;
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uint binlog_type;
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bool cfs_is_null;
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/* Buffer has space for leading length byte */
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char conflict_fn_spec[CONFLICT_FN_SPEC_BUF_LEN + 1];
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Ndb_rep_tab_row();
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void null_terminate_strings() {
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key.null_terminate_strings();
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uint speclen = 0;
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speclen = conflict_fn_spec[0];
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assert(speclen <= MAX_CONFLICT_FN_SPEC_LEN);
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conflict_fn_spec[1 + speclen] = '\0';
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}
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const char *get_conflict_fn_spec() { return &conflict_fn_spec[1]; }
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void set_conflict_fn_spec_null(bool null) {
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if (null) {
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cfs_is_null = true;
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conflict_fn_spec[0] = 0;
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conflict_fn_spec[1] = 0;
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} else {
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cfs_is_null = false;
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}
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}
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};
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/**
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Ndb_rep_tab_reader
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A helper class for accessing the mysql.ndb_replication
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table
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*/
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class Ndb_rep_tab_reader {
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private:
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static const char *ndb_rep_db;
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static const char *ndb_replication_table;
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static const char *nrt_db;
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static const char *nrt_table_name;
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static const char *nrt_server_id;
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static const char *nrt_binlog_type;
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static const char *nrt_conflict_fn;
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Uint32 binlog_flags;
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char conflict_fn_buffer[Ndb_rep_tab_row::CONFLICT_FN_SPEC_BUF_LEN];
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char warning_msg_buffer[FN_REFLEN];
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const char *conflict_fn_spec;
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const char *warning_msg;
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/**
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check_schema
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Checks that the schema of the mysql.ndb_replication table
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is acceptable.
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Returns
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0 if ok
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-1 if a column has an error. Col name in error_str
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-2 if there's a more general error. Error description in
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error_str
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*/
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static int check_schema(const NdbDictionary::Table *reptab,
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const char **error_str);
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/**
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scan_candidates
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Scans the ndb_replication table for rows matching the
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passed db, table_name, server_id triple.
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Returns the quality of the match made.
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-1 = Error in processing, see msg
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0 = No match, use defaults.
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>0 = Use data in best_match
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if msg is set on return it contains a warning.
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Warnings may be produces in non error scenarios
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*/
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int scan_candidates(Ndb *ndb, const NdbDictionary::Table *reptab,
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const char *db, const char *table_name, uint server_id,
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Ndb_rep_tab_row &best_match);
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public:
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Ndb_rep_tab_reader();
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~Ndb_rep_tab_reader() {}
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/**
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lookup
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lookup scans the mysql.ndb_replication table for
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the best matching entry for the supplied db,
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table_name, server_id triple.
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A buffer for the conflict_fn spec, and for any
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error or warning messages must be supplied.
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The passed binlog_flags, conflict_fn_spec and
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message may be updated as a result
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Returns :
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0 : Success.
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<0 : Error.
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*/
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int lookup(Ndb *ndb,
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/* Keys */
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const char *db, const char *table_name, uint server_id);
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/* Following only valid after a call to lookup() */
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Uint32 get_binlog_flags() const;
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const char *get_conflict_fn_spec() const;
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const char *get_warning_message() const;
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};
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#endif
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