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167 lines
6.6 KiB
C++
167 lines
6.6 KiB
C++
/* Copyright (c) 2003, 2011, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 02110-1335 USA */
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#include <zlib.h>
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#include "azlib.h"
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/*
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Please read ha_archive.cc first. If you are looking for more general
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answers on how storage engines work, look at ha_example.cc and
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ha_example.h.
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*/
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typedef struct st_archive_record_buffer {
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uchar *buffer;
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uint32 length;
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} archive_record_buffer;
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class Archive_share : public Handler_share
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{
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public:
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mysql_mutex_t mutex;
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THR_LOCK lock;
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azio_stream archive_write; /* Archive file we are working with */
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ha_rows rows_recorded; /* Number of rows in tables */
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char table_name[FN_REFLEN];
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char data_file_name[FN_REFLEN];
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bool in_optimize;
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bool archive_write_open;
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bool dirty; /* Flag for if a flush should occur */
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bool crashed; /* Meta file is crashed */
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Archive_share();
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virtual ~Archive_share();
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int init_archive_writer();
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void close_archive_writer();
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int write_v1_metafile();
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int read_v1_metafile();
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};
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/*
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Version for file format.
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1 - Initial Version (Never Released)
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2 - Stream Compression, seperate blobs, no packing
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3 - One stream (row and blobs), with packing
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*/
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#define ARCHIVE_VERSION 3
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class ha_archive final : public handler
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{
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THR_LOCK_DATA lock; /* MySQL lock */
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Archive_share *share; /* Shared lock info */
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azio_stream archive; /* Archive file we are working with */
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my_off_t current_position; /* The position of the row we just read */
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uchar byte_buffer[IO_SIZE]; /* Initial buffer for our string */
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String buffer; /* Buffer used for blob storage */
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ha_rows scan_rows; /* Number of rows left in scan */
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bool delayed_insert; /* If the insert is delayed */
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bool bulk_insert; /* If we are performing a bulk insert */
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const uchar *current_key;
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uint current_key_len;
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uint current_k_offset;
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archive_record_buffer *record_buffer;
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bool archive_reader_open;
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archive_record_buffer *create_record_buffer(unsigned int length);
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void destroy_record_buffer(archive_record_buffer *r);
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int frm_copy(azio_stream *src, azio_stream *dst);
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int frm_compare(azio_stream *src);
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unsigned int pack_row_v1(const uchar *record);
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public:
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ha_archive(handlerton *hton, TABLE_SHARE *table_arg);
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~ha_archive() = default;
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const char *index_type(uint inx) override { return "NONE"; }
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ulonglong table_flags() const override
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{
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return (HA_NO_TRANSACTIONS | HA_REC_NOT_IN_SEQ | HA_CAN_BIT_FIELD |
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HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE |
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HA_STATS_RECORDS_IS_EXACT | HA_CAN_EXPORT |
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HA_HAS_RECORDS | HA_CAN_REPAIR | HA_SLOW_RND_POS |
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HA_FILE_BASED | HA_CAN_INSERT_DELAYED | HA_CAN_GEOMETRY);
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}
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ulong index_flags(uint idx, uint part, bool all_parts) const override
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{
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return HA_ONLY_WHOLE_INDEX;
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}
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virtual void get_auto_increment(ulonglong offset, ulonglong increment,
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ulonglong nb_desired_values,
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ulonglong *first_value,
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ulonglong *nb_reserved_values) override;
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uint max_supported_keys() const override { return 1; }
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uint max_supported_key_length() const override { return sizeof(ulonglong); }
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uint max_supported_key_part_length() const override
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{ return sizeof(ulonglong); }
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ha_rows records() override { return share->rows_recorded; }
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IO_AND_CPU_COST scan_time() override;
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IO_AND_CPU_COST keyread_time(uint index, ulong ranges, ha_rows rows,
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ulonglong blocks) override;
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IO_AND_CPU_COST rnd_pos_time(ha_rows rows) override;
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int index_init(uint keynr, bool sorted) override;
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virtual int index_read(uchar * buf, const uchar * key,
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uint key_len, enum ha_rkey_function find_flag)
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override;
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virtual int index_read_idx(uchar * buf, uint index, const uchar * key,
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uint key_len, enum ha_rkey_function find_flag);
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int index_next(uchar * buf) override;
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int open(const char *name, int mode, uint test_if_locked) override;
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int close(void) override;
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int write_row(const uchar * buf) override;
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int real_write_row(const uchar *buf, azio_stream *writer);
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int truncate() override;
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int rnd_init(bool scan=1) override;
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int rnd_next(uchar *buf) override;
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int rnd_pos(uchar * buf, uchar *pos) override;
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int get_row(azio_stream *file_to_read, uchar *buf);
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int get_row_version2(azio_stream *file_to_read, uchar *buf);
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int get_row_version3(azio_stream *file_to_read, uchar *buf);
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Archive_share *get_share(const char *table_name, int *rc);
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int init_archive_reader();
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// Always try auto_repair in case of HA_ERR_CRASHED_ON_USAGE
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bool auto_repair(int error) const override
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{ return error == HA_ERR_CRASHED_ON_USAGE; }
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int read_data_header(azio_stream *file_to_read);
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void position(const uchar *record) override;
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int info(uint) override;
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int extra(enum ha_extra_function operation) override;
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void update_create_info(HA_CREATE_INFO *create_info) override;
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int create(const char *name, TABLE *form, HA_CREATE_INFO *create_info)
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override;
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int optimize(THD* thd, HA_CHECK_OPT* check_opt) override;
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int repair(THD* thd, HA_CHECK_OPT* check_opt) override;
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int check_for_upgrade(HA_CHECK_OPT *check_opt) override;
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void start_bulk_insert(ha_rows rows, uint flags) override;
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int end_bulk_insert() override;
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enum row_type get_row_type() const override
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{
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return ROW_TYPE_COMPRESSED;
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}
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THR_LOCK_DATA **store_lock(THD *thd, THR_LOCK_DATA **to,
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enum thr_lock_type lock_type) override;
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bool is_crashed() const override;
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int check(THD* thd, HA_CHECK_OPT* check_opt) override;
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bool check_and_repair(THD *thd) override;
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uint32 max_row_length(const uchar *buf);
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bool fix_rec_buff(unsigned int length);
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int unpack_row(azio_stream *file_to_read, uchar *record);
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unsigned int pack_row(const uchar *record, azio_stream *writer);
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bool check_if_incompatible_data(HA_CREATE_INFO *info, uint table_changes)
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override;
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int external_lock(THD *thd, int lock_type) override;
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private:
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void flush_and_clear_pending_writes();
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};
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