log_event.h

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/* Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License 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 _log_event_h
#define _log_event_h

#include <my_bitmap.h>
#include "rpl_constants.h"
#include "table_id.h"
#include <set>

#ifdef MYSQL_CLIENT
#include "sql_const.h"
#include "rpl_utility.h"
#include "hash.h"
#include "rpl_tblmap.h"
#endif

#ifdef MYSQL_SERVER
#include "rpl_record.h"
#include "rpl_reporting.h"
#include "sql_class.h"                          /* THD */
#include "rpl_utility.h"                        /* Hash_slave_rows */
#include "rpl_filter.h"
#include "key.h"                                /* key_copy, compare_keys */
#endif

/* Forward declarations */
class String;
typedef ulonglong sql_mode_t;
typedef struct st_db_worker_hash_entry db_worker_hash_entry;

#define PREFIX_SQL_LOAD "SQL_LOAD-"

#define TEMP_FILE_MAX_LEN UUID_LENGTH+38 

#ifdef DBUG_OFF
#define ASSERT_OR_RETURN_ERROR(COND, ERRNO) \
  do { if (!(COND)) return ERRNO; } while (0)
#else
#define ASSERT_OR_RETURN_ERROR(COND, ERRNO) \
  DBUG_ASSERT(COND)
#endif

#define LOG_READ_EOF    -1
#define LOG_READ_BOGUS  -2
#define LOG_READ_IO     -3
#define LOG_READ_MEM    -5
#define LOG_READ_TRUNC  -6
#define LOG_READ_TOO_LARGE -7
#define LOG_READ_CHECKSUM_FAILURE -8

#define LOG_EVENT_OFFSET 4

/*
   3 is MySQL 4.x; 4 is MySQL 5.0.0.
   Compared to version 3, version 4 has:
   - a different Start_log_event, which includes info about the binary log
   (sizes of headers); this info is included for better compatibility if the
   master's MySQL version is different from the slave's.
   - all events have a unique ID (the triplet (server_id, timestamp at server
   start, other) to be sure an event is not executed more than once in a
   multimaster setup, example:
                M1
              /   \
             v     v
             M2    M3
             \     /
              v   v
                S
   if a query is run on M1, it will arrive twice on S, so we need that S
   remembers the last unique ID it has processed, to compare and know if the
   event should be skipped or not. Example of ID: we already have the server id
   (4 bytes), plus:
   timestamp_when_the_master_started (4 bytes), a counter (a sequence number
   which increments every time we write an event to the binlog) (3 bytes).
   Q: how do we handle when the counter is overflowed and restarts from 0 ?

   - Query and Load (Create or Execute) events may have a more precise
     timestamp (with microseconds), number of matched/affected/warnings rows
   and fields of session variables: SQL_MODE,
   FOREIGN_KEY_CHECKS, UNIQUE_CHECKS, SQL_AUTO_IS_NULL, the collations and
   charsets, the PASSWORD() version (old/new/...).
*/
#define BINLOG_VERSION    4

/*
 We could have used SERVER_VERSION_LENGTH, but this introduces an
 obscure dependency - if somebody decided to change SERVER_VERSION_LENGTH
 this would break the replication protocol
*/
#define ST_SERVER_VER_LEN 50

/*
  These are flags and structs to handle all the LOAD DATA INFILE options (LINES
  TERMINATED etc).
*/

/*
  These are flags and structs to handle all the LOAD DATA INFILE options (LINES
  TERMINATED etc).
  DUMPFILE_FLAG is probably useless (DUMPFILE is a clause of SELECT, not of LOAD
  DATA).
*/
#define DUMPFILE_FLAG           0x1
#define OPT_ENCLOSED_FLAG       0x2
#define REPLACE_FLAG            0x4
#define IGNORE_FLAG             0x8

#define FIELD_TERM_EMPTY        0x1
#define ENCLOSED_EMPTY          0x2
#define LINE_TERM_EMPTY         0x4
#define LINE_START_EMPTY        0x8
#define ESCAPED_EMPTY           0x10

/*****************************************************************************

  old_sql_ex struct

 ****************************************************************************/
struct old_sql_ex
{
  char field_term;
  char enclosed;
  char line_term;
  char line_start;
  char escaped;
  char opt_flags;
  char empty_flags;
};

#define NUM_LOAD_DELIM_STRS 5

/*****************************************************************************

  sql_ex_info struct

 ****************************************************************************/
struct sql_ex_info
{
  sql_ex_info() {}                            /* Remove gcc warning */
  const char* field_term;
  const char* enclosed;
  const char* line_term;
  const char* line_start;
  const char* escaped;
  int cached_new_format;
  uint8 field_term_len,enclosed_len,line_term_len,line_start_len, escaped_len;
  char opt_flags;
  char empty_flags;

  // store in new format even if old is possible
  void force_new_format() { cached_new_format = 1;}
  int data_size()
  {
    return (new_format() ?
            field_term_len + enclosed_len + line_term_len +
            line_start_len + escaped_len + 6 : 7);
  }
  bool write_data(IO_CACHE* file);
  const char* init(const char* buf, const char* buf_end, bool use_new_format);
  bool new_format()
  {
    return ((cached_new_format != -1) ? cached_new_format :
            (cached_new_format=(field_term_len > 1 ||
                                enclosed_len > 1 ||
                                line_term_len > 1 || line_start_len > 1 ||
                                escaped_len > 1)));
  }
};

/*****************************************************************************

  MySQL Binary Log

  This log consists of events.  Each event has a fixed-length header,
  possibly followed by a variable length data body.

  The data body consists of an optional fixed length segment (post-header)
  and  an optional variable length segment.

  See the #defines below for the format specifics.

  The events which really update data are Query_log_event,
  Execute_load_query_log_event and old Load_log_event and
  Execute_load_log_event events (Execute_load_query is used together with
  Begin_load_query and Append_block events to replicate LOAD DATA INFILE.
  Create_file/Append_block/Execute_load (which includes Load_log_event)
  were used to replicate LOAD DATA before the 5.0.3).

 ****************************************************************************/

#define LOG_EVENT_HEADER_LEN 19U    /* the fixed header length */
#define OLD_HEADER_LEN       13U    /* the fixed header length in 3.23 */
/*
   Fixed header length, where 4.x and 5.0 agree. That is, 5.0 may have a longer
   header (it will for sure when we have the unique event's ID), but at least
   the first 19 bytes are the same in 4.x and 5.0. So when we have the unique
   event's ID, LOG_EVENT_HEADER_LEN will be something like 26, but
   LOG_EVENT_MINIMAL_HEADER_LEN will remain 19.
*/
#define LOG_EVENT_MINIMAL_HEADER_LEN 19U

/* event-specific post-header sizes */
// where 3.23, 4.x and 5.0 agree
#define QUERY_HEADER_MINIMAL_LEN     (4 + 4 + 1 + 2)
// where 5.0 differs: 2 for len of N-bytes vars.
#define QUERY_HEADER_LEN     (QUERY_HEADER_MINIMAL_LEN + 2)
#define STOP_HEADER_LEN      0
#define LOAD_HEADER_LEN      (4 + 4 + 4 + 1 +1 + 4)
#define START_V3_HEADER_LEN     (2 + ST_SERVER_VER_LEN + 4)
#define ROTATE_HEADER_LEN    8 // this is FROZEN (the Rotate post-header is frozen)
#define INTVAR_HEADER_LEN      0
#define CREATE_FILE_HEADER_LEN 4
#define APPEND_BLOCK_HEADER_LEN 4
#define EXEC_LOAD_HEADER_LEN   4
#define DELETE_FILE_HEADER_LEN 4
#define NEW_LOAD_HEADER_LEN    LOAD_HEADER_LEN
#define RAND_HEADER_LEN        0
#define USER_VAR_HEADER_LEN    0
#define FORMAT_DESCRIPTION_HEADER_LEN (START_V3_HEADER_LEN+1+LOG_EVENT_TYPES)
#define XID_HEADER_LEN         0
#define BEGIN_LOAD_QUERY_HEADER_LEN APPEND_BLOCK_HEADER_LEN
#define ROWS_HEADER_LEN_V1     8
#define TABLE_MAP_HEADER_LEN   8
#define EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN (4 + 4 + 4 + 1)
#define EXECUTE_LOAD_QUERY_HEADER_LEN  (QUERY_HEADER_LEN + EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN)
#define INCIDENT_HEADER_LEN    2
#define HEARTBEAT_HEADER_LEN   0
#define IGNORABLE_HEADER_LEN   0
#define ROWS_HEADER_LEN_V2     10

/*
   The maximum number of updated databases that a status of
   Query-log-event can carry.  It can redefined within a range
   [1.. OVER_MAX_DBS_IN_EVENT_MTS].
*/
#define MAX_DBS_IN_EVENT_MTS 16

/*
   When the actual number of databases exceeds MAX_DBS_IN_EVENT_MTS
   the value of OVER_MAX_DBS_IN_EVENT_MTS is is put into the
   mts_accessed_dbs status.
*/
#define OVER_MAX_DBS_IN_EVENT_MTS 254

/* 
  Max number of possible extra bytes in a replication event compared to a
  packet (i.e. a query) sent from client to master;
  First, an auxiliary log_event status vars estimation:
*/
#define MAX_SIZE_LOG_EVENT_STATUS (1U + 4          /* type, flags2 */   + \
                                   1U + 8          /* type, sql_mode */ + \
                                   1U + 1 + 255    /* type, length, catalog */ + \
                                   1U + 4          /* type, auto_increment */ + \
                                   1U + 6          /* type, charset */ + \
                                   1U + 1 + 255    /* type, length, time_zone */ + \
                                   1U + 2          /* type, lc_time_names_number */ + \
                                   1U + 2          /* type, charset_database_number */ + \
                                   1U + 8          /* type, table_map_for_update */ + \
                                   1U + 4          /* type, master_data_written */ + \
                                                   /* type, db_1, db_2, ... */  \
                                   1U + (MAX_DBS_IN_EVENT_MTS * (1 + NAME_LEN)) + \
                                   3U +            /* type, microseconds */ + \
                                   1U + 16 + 1 + 60/* type, user_len, user, host_len, host */)
#define MAX_LOG_EVENT_HEADER   ( /* in order of Query_log_event::write */ \
  LOG_EVENT_HEADER_LEN + /* write_header */ \
  QUERY_HEADER_LEN     + /* write_data */   \
  EXECUTE_LOAD_QUERY_EXTRA_HEADER_LEN + /*write_post_header_for_derived */ \
  MAX_SIZE_LOG_EVENT_STATUS + /* status */ \
  NAME_LEN + 1)

/*
  The new option is added to handle large packets that are sent from the master 
  to the slave. It is used to increase the thd(max_allowed) for both the
  DUMP thread on the master and the SQL/IO thread on the slave. 
*/
#define MAX_MAX_ALLOWED_PACKET 1024*1024*1024

/* 
   Event header offsets; 
   these point to places inside the fixed header.
*/

#define EVENT_TYPE_OFFSET    4
#define SERVER_ID_OFFSET     5
#define EVENT_LEN_OFFSET     9
#define LOG_POS_OFFSET       13
#define FLAGS_OFFSET         17

/* start event post-header (for v3 and v4) */

#define ST_BINLOG_VER_OFFSET  0
#define ST_SERVER_VER_OFFSET  2
#define ST_CREATED_OFFSET     (ST_SERVER_VER_OFFSET + ST_SERVER_VER_LEN)
#define ST_COMMON_HEADER_LEN_OFFSET (ST_CREATED_OFFSET + 4)

/* slave event post-header (this event is never written) */

#define SL_MASTER_PORT_OFFSET   8
#define SL_MASTER_POS_OFFSET    0
#define SL_MASTER_HOST_OFFSET   10

/* query event post-header */

#define Q_THREAD_ID_OFFSET      0
#define Q_EXEC_TIME_OFFSET      4
#define Q_DB_LEN_OFFSET         8
#define Q_ERR_CODE_OFFSET       9
#define Q_STATUS_VARS_LEN_OFFSET 11
#define Q_DATA_OFFSET           QUERY_HEADER_LEN
/* these are codes, not offsets; not more than 256 values (1 byte). */
#define Q_FLAGS2_CODE           0
#define Q_SQL_MODE_CODE         1
/*
  Q_CATALOG_CODE is catalog with end zero stored; it is used only by MySQL
  5.0.x where 0<=x<=3. We have to keep it to be able to replicate these
  old masters.
*/
#define Q_CATALOG_CODE          2
#define Q_AUTO_INCREMENT        3
#define Q_CHARSET_CODE          4
#define Q_TIME_ZONE_CODE        5
/*
  Q_CATALOG_NZ_CODE is catalog withOUT end zero stored; it is used by MySQL
  5.0.x where x>=4. Saves one byte in every Query_log_event in binlog,
  compared to Q_CATALOG_CODE. The reason we didn't simply re-use
  Q_CATALOG_CODE is that then a 5.0.3 slave of this 5.0.x (x>=4) master would
  crash (segfault etc) because it would expect a 0 when there is none.
*/
#define Q_CATALOG_NZ_CODE       6

#define Q_LC_TIME_NAMES_CODE    7

#define Q_CHARSET_DATABASE_CODE 8

#define Q_TABLE_MAP_FOR_UPDATE_CODE 9

#define Q_MASTER_DATA_WRITTEN_CODE 10

#define Q_INVOKER 11

/*
  Q_UPDATED_DB_NAMES status variable collects of the updated databases
  total number and their names to be propagated to the slave in order
  to facilitate the parallel applying of the Query events.
*/
#define Q_UPDATED_DB_NAMES 12

#define Q_MICROSECONDS 13

/* Intvar event post-header */

/* Intvar event data */
#define I_TYPE_OFFSET        0
#define I_VAL_OFFSET         1

/* Rand event data */
#define RAND_SEED1_OFFSET 0
#define RAND_SEED2_OFFSET 8

/* User_var event data */
#define UV_VAL_LEN_SIZE        4
#define UV_VAL_IS_NULL         1
#define UV_VAL_TYPE_SIZE       1
#define UV_NAME_LEN_SIZE       4
#define UV_CHARSET_NUMBER_SIZE 4

/* Load event post-header */
#define L_THREAD_ID_OFFSET   0
#define L_EXEC_TIME_OFFSET   4
#define L_SKIP_LINES_OFFSET  8
#define L_TBL_LEN_OFFSET     12
#define L_DB_LEN_OFFSET      13
#define L_NUM_FIELDS_OFFSET  14
#define L_SQL_EX_OFFSET      18
#define L_DATA_OFFSET        LOAD_HEADER_LEN

/* Rotate event post-header */
#define R_POS_OFFSET       0
#define R_IDENT_OFFSET     8

/* CF to DF handle LOAD DATA INFILE */

/* CF = "Create File" */
#define CF_FILE_ID_OFFSET  0
#define CF_DATA_OFFSET     CREATE_FILE_HEADER_LEN

/* AB = "Append Block" */
#define AB_FILE_ID_OFFSET  0
#define AB_DATA_OFFSET     APPEND_BLOCK_HEADER_LEN

/* EL = "Execute Load" */
#define EL_FILE_ID_OFFSET  0

/* DF = "Delete File" */
#define DF_FILE_ID_OFFSET  0

/* TM = "Table Map" */
#define TM_MAPID_OFFSET    0
#define TM_FLAGS_OFFSET    6

/* RW = "RoWs" */
#define RW_MAPID_OFFSET    0
#define RW_FLAGS_OFFSET    6
#define RW_VHLEN_OFFSET    8
#define RW_V_TAG_LEN       1
#define RW_V_EXTRAINFO_TAG 0

/* ELQ = "Execute Load Query" */
#define ELQ_FILE_ID_OFFSET QUERY_HEADER_LEN
#define ELQ_FN_POS_START_OFFSET ELQ_FILE_ID_OFFSET + 4
#define ELQ_FN_POS_END_OFFSET ELQ_FILE_ID_OFFSET + 8
#define ELQ_DUP_HANDLING_OFFSET ELQ_FILE_ID_OFFSET + 12

/* 4 bytes which all binlogs should begin with */
#define BINLOG_MAGIC        "\xfe\x62\x69\x6e"

/*
  The 2 flags below were useless :
  - the first one was never set
  - the second one was set in all Rotate events on the master, but not used for
  anything useful.
  So they are now removed and their place may later be reused for other
  flags. Then one must remember that Rotate events in 4.x have
  LOG_EVENT_FORCED_ROTATE_F set, so one should not rely on the value of the
  replacing flag when reading a Rotate event.
  I keep the defines here just to remember what they were.
*/
#ifdef TO_BE_REMOVED
#define LOG_EVENT_TIME_F            0x1
#define LOG_EVENT_FORCED_ROTATE_F   0x2
#endif

/*
   This flag only makes sense for Format_description_log_event. It is set
   when the event is written, and *reset* when a binlog file is
   closed (yes, it's the only case when MySQL modifies already written
   part of binlog).  Thus it is a reliable indicator that binlog was
   closed correctly.  (Stop_log_event is not enough, there's always a
   small chance that mysqld crashes in the middle of insert and end of
   the binlog would look like a Stop_log_event).

   This flag is used to detect a restart after a crash, and to provide
   "unbreakable" binlog. The problem is that on a crash storage engines
   rollback automatically, while binlog does not.  To solve this we use this
   flag and automatically append ROLLBACK to every non-closed binlog (append
   virtually, on reading, file itself is not changed). If this flag is found,
   mysqlbinlog simply prints "ROLLBACK" Replication master does not abort on
   binlog corruption, but takes it as EOF, and replication slave forces a
   rollback in this case.

   Note, that old binlogs does not have this flag set, so we get a
   a backward-compatible behaviour.
*/

#define LOG_EVENT_BINLOG_IN_USE_F       0x1

#define LOG_EVENT_THREAD_SPECIFIC_F 0x4

#define LOG_EVENT_SUPPRESS_USE_F    0x8

/*
  Note: this is a place holder for the flag
  LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F (0x10), which is not used any
  more, please do not reused this value for other flags.
 */

#define LOG_EVENT_ARTIFICIAL_F 0x20

#define LOG_EVENT_RELAY_LOG_F 0x40

#define LOG_EVENT_IGNORABLE_F 0x80

#define LOG_EVENT_NO_FILTER_F 0x100

#define LOG_EVENT_MTS_ISOLATE_F 0x200


#define OPTIONS_WRITTEN_TO_BIN_LOG \
  (OPTION_AUTO_IS_NULL | OPTION_NO_FOREIGN_KEY_CHECKS |  \
   OPTION_RELAXED_UNIQUE_CHECKS | OPTION_NOT_AUTOCOMMIT)

/* Shouldn't be defined before */
#define EXPECTED_OPTIONS \
  ((ULL(1) << 14) | (ULL(1) << 26) | (ULL(1) << 27) | (ULL(1) << 19))

#if OPTIONS_WRITTEN_TO_BIN_LOG != EXPECTED_OPTIONS
#error OPTIONS_WRITTEN_TO_BIN_LOG must NOT change their values!
#endif
#undef EXPECTED_OPTIONS         /* You shouldn't use this one */

enum enum_binlog_checksum_alg {
  BINLOG_CHECKSUM_ALG_OFF= 0,    // Events are without checksum though its generator
                                 // is checksum-capable New Master (NM).
  BINLOG_CHECKSUM_ALG_CRC32= 1,  // CRC32 of zlib algorithm.
  BINLOG_CHECKSUM_ALG_ENUM_END,  // the cut line: valid alg range is [1, 0x7f].
  BINLOG_CHECKSUM_ALG_UNDEF= 255 // special value to tag undetermined yet checksum
                                 // or events from checksum-unaware servers
};

#define CHECKSUM_CRC32_SIGNATURE_LEN 4

#define BINLOG_CHECKSUM_LEN CHECKSUM_CRC32_SIGNATURE_LEN
#define BINLOG_CHECKSUM_ALG_DESC_LEN 1  /* 1 byte checksum alg descriptor */

enum Log_event_type
{
  /*
    Every time you update this enum (when you add a type), you have to
    fix Format_description_log_event::Format_description_log_event().
  */
  UNKNOWN_EVENT= 0,
  START_EVENT_V3= 1,
  QUERY_EVENT= 2,
  STOP_EVENT= 3,
  ROTATE_EVENT= 4,
  INTVAR_EVENT= 5,
  LOAD_EVENT= 6,
  SLAVE_EVENT= 7,  /* Unused. Slave_log_event code has been removed. (15th Oct. 2010) */
  CREATE_FILE_EVENT= 8,
  APPEND_BLOCK_EVENT= 9,
  EXEC_LOAD_EVENT= 10,
  DELETE_FILE_EVENT= 11,
  /*
    NEW_LOAD_EVENT is like LOAD_EVENT except that it has a longer
    sql_ex, allowing multibyte TERMINATED BY etc; both types share the
    same class (Load_log_event)
  */
  NEW_LOAD_EVENT= 12,
  RAND_EVENT= 13,
  USER_VAR_EVENT= 14,
  FORMAT_DESCRIPTION_EVENT= 15,
  XID_EVENT= 16,
  BEGIN_LOAD_QUERY_EVENT= 17,
  EXECUTE_LOAD_QUERY_EVENT= 18,

  TABLE_MAP_EVENT = 19,

  /*
    These event numbers were used for 5.1.0 to 5.1.15 and are
    therefore obsolete.
   */
  PRE_GA_WRITE_ROWS_EVENT = 20,
  PRE_GA_UPDATE_ROWS_EVENT = 21,
  PRE_GA_DELETE_ROWS_EVENT = 22,

  /*
    These event numbers are used from 5.1.16 until mysql-trunk-xx
   */
  WRITE_ROWS_EVENT_V1 = 23,
  UPDATE_ROWS_EVENT_V1 = 24,
  DELETE_ROWS_EVENT_V1 = 25,

  /*
    Something out of the ordinary happened on the master
   */
  INCIDENT_EVENT= 26,

  /*
    Heartbeat event to be send by master at its idle time 
    to ensure master's online status to slave 
  */
  HEARTBEAT_LOG_EVENT= 27,

  /*
    In some situations, it is necessary to send over ignorable
    data to the slave: data that a slave can handle in case there
    is code for handling it, but which can be ignored if it is not
    recognized.
  */
  IGNORABLE_LOG_EVENT= 28,
  ROWS_QUERY_LOG_EVENT= 29,

  /* Version 2 of the Row events */
  WRITE_ROWS_EVENT = 30,
  UPDATE_ROWS_EVENT = 31,
  DELETE_ROWS_EVENT = 32,

  GTID_LOG_EVENT= 33,
  ANONYMOUS_GTID_LOG_EVENT= 34,

  PREVIOUS_GTIDS_LOG_EVENT= 35,
  /*
    Add new events here - right above this comment!
    Existing events (except ENUM_END_EVENT) should never change their numbers
  */

  ENUM_END_EVENT /* end marker */
};

/*
   The number of types we handle in Format_description_log_event (UNKNOWN_EVENT
   is not to be handled, it does not exist in binlogs, it does not have a
   format).
*/
#define LOG_EVENT_TYPES (ENUM_END_EVENT-1)

enum Int_event_type
{
  INVALID_INT_EVENT = 0, LAST_INSERT_ID_EVENT = 1, INSERT_ID_EVENT = 2
};


#ifdef MYSQL_SERVER
class String;
class MYSQL_BIN_LOG;
class THD;
#endif

class Format_description_log_event;
class Relay_log_info;
class Slave_worker;
class Slave_committed_queue;

#ifdef MYSQL_CLIENT
enum enum_base64_output_mode {
  BASE64_OUTPUT_NEVER= 0,
  BASE64_OUTPUT_AUTO= 1,
  BASE64_OUTPUT_UNSPEC= 2,
  BASE64_OUTPUT_DECODE_ROWS= 3,
  /* insert new output modes here */
  BASE64_OUTPUT_MODE_COUNT
};

/*
  A structure for mysqlbinlog to know how to print events

  This structure is passed to the event's print() methods,

  There are two types of settings stored here:
  1. Last db, flags2, sql_mode etc comes from the last printed event.
     They are stored so that only the necessary USE and SET commands
     are printed.
  2. Other information on how to print the events, e.g. short_form,
     hexdump_from.  These are not dependent on the last event.
*/
typedef struct st_print_event_info
{
  /*
    Settings for database, sql_mode etc that comes from the last event
    that was printed.  We cache these so that we don't have to print
    them if they are unchanged.
  */
  // TODO: have the last catalog here ??
  char db[FN_REFLEN+1]; // TODO: make this a LEX_STRING when thd->db is
  bool flags2_inited;
  uint32 flags2;
  bool sql_mode_inited;
  sql_mode_t sql_mode;          /* must be same as THD.variables.sql_mode */
  ulong auto_increment_increment, auto_increment_offset;
  bool charset_inited;
  char charset[6]; // 3 variables, each of them storable in 2 bytes
  char time_zone_str[MAX_TIME_ZONE_NAME_LENGTH];
  uint lc_time_names_number;
  uint charset_database_number;
  uint thread_id;
  bool thread_id_printed;
  uint32 server_id_from_fd_event;

  st_print_event_info();

  ~st_print_event_info() {
    close_cached_file(&head_cache);
    close_cached_file(&body_cache);
  }
  bool init_ok() /* tells if construction was successful */
    { return my_b_inited(&head_cache) && my_b_inited(&body_cache); }


  /* Settings on how to print the events */
  bool short_form;
  enum_base64_output_mode base64_output_mode;
  /*
    This is set whenever a Format_description_event is printed.
    Later, when an event is printed in base64, this flag is tested: if
    no Format_description_event has been seen, it is unsafe to print
    the base64 event, so an error message is generated.
  */
  bool printed_fd_event;
  my_off_t hexdump_from;
  uint8 common_header_len;
  char delimiter[16];

  uint verbose;
  table_mapping m_table_map;
  table_mapping m_table_map_ignored;

  /*
     These two caches are used by the row-based replication events to
     collect the header information and the main body of the events
     making up a statement.
   */
  IO_CACHE head_cache;
  IO_CACHE body_cache;
  /* Indicate if the body cache has unflushed events */
  bool have_unflushed_events;

  /*
     True if an event was skipped while printing the events of
     a transaction and no COMMIT statement or XID event was ever
     output (ie, was filtered out as well). This can be triggered
     by the --database option of mysqlbinlog.

     False, otherwise.
   */
  bool skipped_event_in_transaction;

  /* true if gtid_next is set with a value */
  bool is_gtid_next_set;

  /*
    Determines if the current value of gtid_next needs to be restored
    to AUTOMATIC if the binary log would end after the current event.

    If the log ends after a transaction, then this should be false.
    If the log ends in the middle of a transaction, then this should
    be true; this can happen for relay logs where transactions are
    split over multiple logs.

    Set to true initially, and after a Gtid_log_event is processed.
    Set to false if is_gtid_next_set is true.
   */
  bool is_gtid_next_valid;
} PRINT_EVENT_INFO;
#endif

/*
  A specific to the database-scheduled MTS type.
*/
typedef struct st_mts_db_names
{
  const char *name[MAX_DBS_IN_EVENT_MTS];
  int  num;
} Mts_db_names;


class Log_event
{
public:
  enum enum_skip_reason {
    EVENT_SKIP_NOT,

    EVENT_SKIP_IGNORE,

    EVENT_SKIP_COUNT
  };

protected:
  enum enum_event_cache_type 
  {
    EVENT_INVALID_CACHE= 0,
    /* 
      If possible the event should use a non-transactional cache before
      being flushed to the binary log. This means that it must be flushed
      right after its correspondent statement is completed.
    */
    EVENT_STMT_CACHE,
    /* 
      The event should use a transactional cache before being flushed to
      the binary log. This means that it must be flushed upon commit or 
      rollback. 
    */
    EVENT_TRANSACTIONAL_CACHE,
    /* 
      The event must be written directly to the binary log without going
      through any cache.
    */
    EVENT_NO_CACHE,
    /*
       If there is a need for different types, introduce them before this.
    */
    EVENT_CACHE_COUNT
  };

  enum enum_event_logging_type
  {
    EVENT_INVALID_LOGGING= 0,
    /*
      The event must be written to a cache and upon commit or rollback
      written to the binary log.
    */
    EVENT_NORMAL_LOGGING,
    /*
      The event must be written to an empty cache and immediatly written
      to the binary log without waiting for any other event.
    */
    EVENT_IMMEDIATE_LOGGING,
    /*
       If there is a need for different types, introduce them before this.
    */
    EVENT_CACHE_LOGGING_COUNT
  };

public:
  /*
    The following type definition is to be used whenever data is placed 
    and manipulated in a common buffer. Use this typedef for buffers
    that contain data containing binary and character data.
  */
  typedef unsigned char Byte;

  /*
    The offset in the log where this event originally appeared (it is
    preserved in relay logs, making SHOW SLAVE STATUS able to print
    coordinates of the event in the master's binlog). Note: when a
    transaction is written by the master to its binlog (wrapped in
    BEGIN/COMMIT) the log_pos of all the queries it contains is the
    one of the BEGIN (this way, when one does SHOW SLAVE STATUS it
    sees the offset of the BEGIN, which is logical as rollback may
    occur), except the COMMIT query which has its real offset.
  */
  my_off_t log_pos;
  /*
     A temp buffer for read_log_event; it is later analysed according to the
     event's type, and its content is distributed in the event-specific fields.
  */
  char *temp_buf;
  /*
    Timestamp on the master(for debugging and replication of
    NOW()/TIMESTAMP).  It is important for queries and LOAD DATA
    INFILE. This is set at the event's creation time, except for Query
    and Load (et al.) events where this is set at the query's
    execution time, which guarantees good replication (otherwise, we
    could have a query and its event with different timestamps).
  */
  struct timeval when;
  /* The number of seconds the query took to run on the master. */
  ulong exec_time;
  /* Number of bytes written by write() function */
  ulong data_written;

  /*
    The master's server id (is preserved in the relay log; used to
    prevent from infinite loops in circular replication).
  */
  uint32 server_id;

  /*
    The server id read from the Binlog.  server_id above has
    lowest bits of this only according to the value of
    opt_server_id_bits
  */
  uint32 unmasked_server_id;

  uint16 flags;
  
  ulong slave_exec_mode;

  enum_event_cache_type event_cache_type;

  enum_event_logging_type event_logging_type;

  ha_checksum crc;

  ulong mts_group_idx;

  Relay_log_info *worker;

  ulonglong future_event_relay_log_pos;

#ifdef MYSQL_SERVER
  THD* thd;
  db_worker_hash_entry *mts_assigned_partitions[MAX_DBS_IN_EVENT_MTS];

  Log_event(enum_event_cache_type cache_type_arg= EVENT_INVALID_CACHE,
            enum_event_logging_type logging_type_arg= EVENT_INVALID_LOGGING);
  Log_event(THD* thd_arg, uint16 flags_arg,
            enum_event_cache_type cache_type_arg,
            enum_event_logging_type logging_type_arg);
  /*
    read_log_event() functions read an event from a binlog or relay
    log; used by SHOW BINLOG EVENTS, the binlog_dump thread on the
    master (reads master's binlog), the slave IO thread (reads the
    event sent by binlog_dump), the slave SQL thread (reads the event
    from the relay log).  If mutex is 0, the read will proceed without
    mutex.  We need the description_event to be able to parse the
    event (to know the post-header's size); in fact in read_log_event
    we detect the event's type, then call the specific event's
    constructor and pass description_event as an argument.
  */
  static Log_event* read_log_event(IO_CACHE* file,
                                   mysql_mutex_t* log_lock,
                                   const Format_description_log_event
                                   *description_event,
                                   my_bool crc_check);

  static int read_log_event(IO_CACHE* file, String* packet,
                            mysql_mutex_t* log_lock,
                            uint8 checksum_alg_arg,
                            const char *log_file_name_arg= NULL,
                            bool* is_binlog_active= NULL);
  /*
    init_show_field_list() prepares the column names and types for the
    output of SHOW BINLOG EVENTS; it is used only by SHOW BINLOG
    EVENTS.
  */
  static void init_show_field_list(List<Item>* field_list);
#ifdef HAVE_REPLICATION
  int net_send(Protocol *protocol, const char* log_name, my_off_t pos);

  virtual int pack_info(Protocol *protocol);

#endif /* HAVE_REPLICATION */
  virtual const char* get_db()
  {
    return thd ? thd->db : 0;
  }
#else // ifdef MYSQL_SERVER
  Log_event(enum_event_cache_type cache_type_arg= EVENT_INVALID_CACHE,
            enum_event_logging_type logging_type_arg= EVENT_INVALID_LOGGING)
  : temp_buf(0), flags(0), event_cache_type(cache_type_arg),
    event_logging_type(logging_type_arg)
  { }
    /* avoid having to link mysqlbinlog against libpthread */
  static Log_event* read_log_event(IO_CACHE* file,
                                   const Format_description_log_event
                                   *description_event, my_bool crc_check);
  /* print*() functions are used by mysqlbinlog */
  virtual void print(FILE* file, PRINT_EVENT_INFO* print_event_info) = 0;
  void print_timestamp(IO_CACHE* file, time_t* ts);
  void print_header(IO_CACHE* file, PRINT_EVENT_INFO* print_event_info,
                    bool is_more);
  void print_base64(IO_CACHE* file, PRINT_EVENT_INFO* print_event_info,
                    bool is_more);
#endif // ifdef MYSQL_SERVER ... else
  /* 
     The value is set by caller of FD constructor and
     Log_event::write_header() for the rest.
     In the FD case it's propagated into the last byte 
     of post_header_len[] at FD::write().
     On the slave side the value is assigned from post_header_len[last] 
     of the last seen FD event.
  */
  uint8 checksum_alg;

  static void *operator new(size_t size)
  {
    return (void*) my_malloc((uint)size, MYF(MY_WME|MY_FAE));
  }

  static void operator delete(void *ptr, size_t)
  {
    my_free(ptr);
  }

  /* Placement version of the above operators */
  static void *operator new(size_t, void* ptr) { return ptr; }
  static void operator delete(void*, void*) { }
  bool wrapper_my_b_safe_write(IO_CACHE* file, const uchar* buf, ulong data_length);

#ifdef MYSQL_SERVER
  bool write_header(IO_CACHE* file, ulong data_length);
  bool write_footer(IO_CACHE* file);
  my_bool need_checksum();

  virtual bool write(IO_CACHE* file)
  {
    return(write_header(file, get_data_size()) ||
           write_data_header(file) ||
           write_data_body(file) ||
           write_footer(file));
  }
  virtual bool write_data_header(IO_CACHE* file)
  { return 0; }
  virtual bool write_data_body(IO_CACHE* file __attribute__((unused)))
  { return 0; }
  inline time_t get_time()
  {
    if (!when.tv_sec && !when.tv_usec) /* Not previously initialized */
    {
      THD *tmp_thd= thd ? thd : current_thd;
      if (tmp_thd)
        when= tmp_thd->start_time;
      else
        my_micro_time_to_timeval(my_micro_time(), &when);
    }
    return (time_t) when.tv_sec;
  }
#endif
  virtual Log_event_type get_type_code() = 0;
  virtual bool is_valid() const = 0;
  void set_artificial_event() { flags |= LOG_EVENT_ARTIFICIAL_F; }
  void set_relay_log_event() { flags |= LOG_EVENT_RELAY_LOG_F; }
  bool is_artificial_event() const { return flags & LOG_EVENT_ARTIFICIAL_F; }
  bool is_relay_log_event() const { return flags & LOG_EVENT_RELAY_LOG_F; }
  bool is_ignorable_event() const { return flags & LOG_EVENT_IGNORABLE_F; }
  bool is_no_filter_event() const { return flags & LOG_EVENT_NO_FILTER_F; }
  inline bool is_using_trans_cache() const
  {
    return (event_cache_type == EVENT_TRANSACTIONAL_CACHE);
  }
  inline bool is_using_stmt_cache() const
  {
    return(event_cache_type == EVENT_STMT_CACHE);
  }
  inline bool is_using_immediate_logging() const
  {
    return(event_logging_type == EVENT_IMMEDIATE_LOGGING);
  }
  Log_event(const char* buf, const Format_description_log_event
            *description_event);
  virtual ~Log_event() { free_temp_buf();}
  void register_temp_buf(char* buf) { temp_buf = buf; }
  void free_temp_buf()
  {
    if (temp_buf)
    {
      my_free(temp_buf);
      temp_buf = 0;
    }
  }
  /*
    Get event length for simple events. For complicated events the length
    is calculated during write()
  */
  virtual int get_data_size() { return 0;}
  static Log_event* read_log_event(const char* buf, uint event_len,
                                   const char **error,
                                   const Format_description_log_event
                                   *description_event, my_bool crc_check);
  static const char* get_type_str(Log_event_type type);
  const char* get_type_str();

  /* Return start of query time or current time */

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)

private:

  /*
    possible decisions by get_mts_execution_mode().
    The execution mode can be PARALLEL or not (thereby sequential
    unless impossible at all). When it's sequential it further  breaks into
    ASYNChronous and SYNChronous.
  */
  enum enum_mts_event_exec_mode
  {
    /*
      Event is run by a Worker.
    */
    EVENT_EXEC_PARALLEL,
    /*
      Event is run by Coordinator.
    */
    EVENT_EXEC_ASYNC,
    /*
      Event is run by Coordinator and requires synchronization with Workers.
    */
    EVENT_EXEC_SYNC,
    /*
      Event can't be executed neither by Workers nor Coordinator.
    */
    EVENT_EXEC_CAN_NOT
  };

  bool is_mts_sequential_exec()
  {
    return
      get_type_code() == START_EVENT_V3          ||
      get_type_code() == STOP_EVENT              ||
      get_type_code() == ROTATE_EVENT            ||
      get_type_code() == LOAD_EVENT              ||
      get_type_code() == SLAVE_EVENT             ||
      get_type_code() == CREATE_FILE_EVENT       ||
      get_type_code() == DELETE_FILE_EVENT       ||
      get_type_code() == NEW_LOAD_EVENT          ||
      get_type_code() == EXEC_LOAD_EVENT         ||
      get_type_code() == FORMAT_DESCRIPTION_EVENT||

      get_type_code() == INCIDENT_EVENT;
  }

  enum enum_mts_event_exec_mode get_mts_execution_mode(ulong slave_server_id,
                                                   bool mts_in_group)
  {
    if ((get_type_code() == FORMAT_DESCRIPTION_EVENT &&
         ((server_id == (uint32) ::server_id) || (log_pos == 0))) ||
        (get_type_code() == ROTATE_EVENT &&
         ((server_id == (uint32) ::server_id) ||
          (log_pos == 0    /* very first fake Rotate (R_f) */
           && mts_in_group /* ignored event turned into R_f at slave stop */))))
      return EVENT_EXEC_ASYNC;
    else if (is_mts_sequential_exec())
      return EVENT_EXEC_SYNC;
    else
      return EVENT_EXEC_PARALLEL;
  }

  Slave_worker *get_slave_worker(Relay_log_info *rli);

  virtual uint8 get_mts_dbs(Mts_db_names *arg)
  {
    arg->name[0]= get_db();

    return arg->num= mts_number_dbs();
  }

  /*
    Group of events can be marked to force its execution
    in isolation from any other Workers.
    Typically that is done for a transaction that contains
    a query accessing more than OVER_MAX_DBS_IN_EVENT_MTS databases.
    Factually that's a sequential mode where a Worker remains to
    be the applier.
  */
  virtual void set_mts_isolate_group()
  {
    DBUG_ASSERT(ends_group() ||
                get_type_code() == QUERY_EVENT ||
                get_type_code() == EXEC_LOAD_EVENT ||
                get_type_code() == EXECUTE_LOAD_QUERY_EVENT);
    flags |= LOG_EVENT_MTS_ISOLATE_F;
  }


public:

  bool contains_partition_info(bool);

  /*
    @return  the number of updated by the event databases.

    @note In other than Query-log-event case that's one.
  */
  virtual uint8 mts_number_dbs() { return 1; }

  bool is_mts_group_isolated() { return flags & LOG_EVENT_MTS_ISOLATE_F; }

  virtual bool starts_group() { return FALSE; }

  virtual bool ends_group()   { return FALSE; }

  int apply_event(Relay_log_info *rli);

  int update_pos(Relay_log_info *rli)
  {
    return do_update_pos(rli);
  }

  enum_skip_reason shall_skip(Relay_log_info *rli)
  {
    return do_shall_skip(rli);
  }

  virtual int do_apply_event(Relay_log_info const *rli)
  {
    return 0;                /* Default implementation does nothing */
  }

  virtual int do_apply_event_worker(Slave_worker *w);

protected:

  enum_skip_reason continue_group(Relay_log_info *rli);

  virtual int do_update_pos(Relay_log_info *rli);


  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


/*
   One class for each type of event.
   Two constructors for each class:
   - one to create the event for logging (when the server acts as a master),
   called after an update to the database is done,
   which accepts parameters like the query, the database, the options for LOAD
   DATA INFILE...
   - one to create the event from a packet (when the server acts as a slave),
   called before reproducing the update, which accepts parameters (like a
   buffer). Used to read from the master, from the relay log, and in
   mysqlbinlog. This constructor must be format-tolerant.
*/

class Query_log_event: public Log_event
{
  LEX_STRING user;
  LEX_STRING host;
protected:
  Log_event::Byte* data_buf;
public:
  const char* query;
  const char* catalog;
  const char* db;
  /*
    If we already know the length of the query string
    we pass it with q_len, so we would not have to call strlen()
    otherwise, set it to 0, in which case, we compute it with strlen()
  */
  uint32 q_len;
  uint32 db_len;
  uint16 error_code;
  ulong thread_id;
  /*
    For events created by Query_log_event::do_apply_event (and
    Load_log_event::do_apply_event()) we need the *original* thread
    id, to be able to log the event with the original (=master's)
    thread id (fix for BUG#1686).
  */
  ulong slave_proxy_id;

  /*
    Binlog format 3 and 4 start to differ (as far as class members are
    concerned) from here.
  */

  uint catalog_len;                     // <= 255 char; 0 means uninited

  /*
    We want to be able to store a variable number of N-bit status vars:
    (generally N=32; but N=64 for SQL_MODE) a user may want to log the number
    of affected rows (for debugging) while another does not want to lose 4
    bytes in this.
    The storage on disk is the following:
    status_vars_len is part of the post-header,
    status_vars are in the variable-length part, after the post-header, before
    the db & query.
    status_vars on disk is a sequence of pairs (code, value) where 'code' means
    'sql_mode', 'affected' etc. Sometimes 'value' must be a short string, so
    its first byte is its length. For now the order of status vars is:
    flags2 - sql_mode - catalog - autoinc - charset
    We should add the same thing to Load_log_event, but in fact
    LOAD DATA INFILE is going to be logged with a new type of event (logging of
    the plain text query), so Load_log_event would be frozen, so no need. The
    new way of logging LOAD DATA INFILE would use a derived class of
    Query_log_event, so automatically benefit from the work already done for
    status variables in Query_log_event.
 */
  uint16 status_vars_len;

  /*
    'flags2' is a second set of flags (on top of those in Log_event), for
    session variables. These are thd->options which is & against a mask
    (OPTIONS_WRITTEN_TO_BIN_LOG).
    flags2_inited helps make a difference between flags2==0 (3.23 or 4.x
    master, we don't know flags2, so use the slave server's global options) and
    flags2==0 (5.0 master, we know this has a meaning of flags all down which
    must influence the query).
  */
  bool flags2_inited;
  bool sql_mode_inited;
  bool charset_inited;

  uint32 flags2;
  /* In connections sql_mode is 32 bits now but will be 64 bits soon */
  sql_mode_t sql_mode;
  ulong auto_increment_increment, auto_increment_offset;
  char charset[6];
  uint time_zone_len; /* 0 means uninited */
  const char *time_zone_str;
  uint lc_time_names_number; /* 0 means en_US */
  uint charset_database_number;
  /*
    map for tables that will be updated for a multi-table update query
    statement, for other query statements, this will be zero.
  */
  ulonglong table_map_for_update;
  /*
    Holds the original length of a Query_log_event that comes from a
    master of version < 5.0 (i.e., binlog_version < 4). When the IO
    thread writes the relay log, it augments the Query_log_event with a
    Q_MASTER_DATA_WRITTEN_CODE status_var that holds the original event
    length. This field is initialized to non-zero in the SQL thread when
    it reads this augmented event. SQL thread does not write 
    Q_MASTER_DATA_WRITTEN_CODE to the slave's server binlog.
  */
  uint32 master_data_written;
  /*
    number of updated databases by the query and their names. This info
    is requested by both Coordinator and Worker.
  */
  uchar mts_accessed_dbs;
  char mts_accessed_db_names[MAX_DBS_IN_EVENT_MTS][NAME_LEN];

#ifdef MYSQL_SERVER

  Query_log_event(THD* thd_arg, const char* query_arg, ulong query_length,
                  bool using_trans, bool immediate, bool suppress_use,
                  int error, bool ignore_command= FALSE);
  const char* get_db() { return db; }

  virtual uint8 get_mts_dbs(Mts_db_names* arg)
  {
    if (mts_accessed_dbs == OVER_MAX_DBS_IN_EVENT_MTS)
    {
      // the empty string db name is special to indicate sequential applying
      mts_accessed_db_names[0][0]= 0;
    }
    else
    {
      for (uchar i= 0; i < mts_accessed_dbs; i++)
      {
        char *db_name= mts_accessed_db_names[i];

        // Only default database is rewritten.
        if (!rpl_filter->is_rewrite_empty() && !strcmp(get_db(), db_name))
        {
          size_t dummy_len;
          const char *db_filtered= rpl_filter->get_rewrite_db(db_name, &dummy_len);
          // db_name != db_filtered means that db_name is rewritten.
          if (strcmp(db_name, db_filtered))
            db_name= (char*)db_filtered;
        }
        arg->name[i]= db_name;
      }
    }
    return arg->num= mts_accessed_dbs;
  }

  void attach_temp_tables_worker(THD*);
  void detach_temp_tables_worker(THD*);

  virtual uchar mts_number_dbs() { return mts_accessed_dbs; }

#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print_query_header(IO_CACHE* file, PRINT_EVENT_INFO* print_event_info);
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Query_log_event();
  Query_log_event(const char* buf, uint event_len,
                  const Format_description_log_event *description_event,
                  Log_event_type event_type);
  ~Query_log_event()
  {
    if (data_buf)
      my_free(data_buf);
  }
  Log_event_type get_type_code() { return QUERY_EVENT; }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
  virtual bool write_post_header_for_derived(IO_CACHE* file) { return FALSE; }
#endif
  bool is_valid() const { return query != 0; }

  /*
    Returns number of bytes additionaly written to post header by derived
    events (so far it is only Execute_load_query event).
  */
  virtual ulong get_post_header_size_for_derived() { return 0; }
  /* Writes derived event-specific part of post header. */

public:        /* !!! Public in this patch to allow old usage */
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);

  int do_apply_event(Relay_log_info const *rli,
                       const char *query_arg,
                       uint32 q_len_arg);
#endif /* HAVE_REPLICATION */
  /*
    If true, the event always be applied by slave SQL thread or be printed by
    mysqlbinlog
   */
  bool is_trans_keyword()
  {
    /*
      Before the patch for bug#50407, The 'SAVEPOINT and ROLLBACK TO'
      queries input by user was written into log events directly.
      So the keywords can be written in both upper case and lower case
      together, strncasecmp is used to check both cases. they also could be
      binlogged with comments in the front of these keywords. for examples:
        / * bla bla * / SAVEPOINT a;
        / * bla bla * / ROLLBACK TO a;
      but we don't handle these cases and after the patch, both quiries are
      binlogged in upper case with no comments.
     */
    return !strncmp(query, "BEGIN", q_len) ||
      !strncmp(query, "COMMIT", q_len) ||
      !strncasecmp(query, "SAVEPOINT", 9) ||
      !strncasecmp(query, "ROLLBACK", 8);
  }
  bool starts_group() { return !strncmp(query, "BEGIN", q_len); }
  virtual bool ends_group()
  {  
    return
      !strncmp(query, "COMMIT", q_len) ||
      (!strncasecmp(query, STRING_WITH_LEN("ROLLBACK"))
       && strncasecmp(query, STRING_WITH_LEN("ROLLBACK TO ")));
  }
};


class Load_log_event: public Log_event
{
private:
protected:
  int copy_log_event(const char *buf, ulong event_len,
                     int body_offset,
                     const Format_description_log_event* description_event);

public:
  uint get_query_buffer_length();
  void print_query(bool need_db, const char *cs, char *buf, char **end,
                   char **fn_start, char **fn_end);
  ulong thread_id;
  ulong slave_proxy_id;
  uint32 table_name_len;
  /*
    No need to have a catalog, as these events can only come from 4.x.
    TODO: this may become false if Dmitri pushes his new LOAD DATA INFILE in
    5.0 only (not in 4.x).
  */
  uint32 db_len;
  uint32 fname_len;
  uint32 num_fields;
  const char* fields;
  const uchar* field_lens;
  uint32 field_block_len;

  const char* table_name;
  const char* db;
  const char* fname;
  uint32 skip_lines;
  sql_ex_info sql_ex;
  bool local_fname;
  bool is_concurrent;

  /* fname doesn't point to memory inside Log_event::temp_buf  */
  void set_fname_outside_temp_buf(const char *afname, uint alen)
  {
    fname= afname;
    fname_len= alen;
    local_fname= TRUE;
  }
  /* fname doesn't point to memory inside Log_event::temp_buf  */
  int  check_fname_outside_temp_buf()
  {
    return local_fname;
  }

#ifdef MYSQL_SERVER
  String field_lens_buf;
  String fields_buf;

  Load_log_event(THD* thd, sql_exchange* ex, const char* db_arg,
                 const char* table_name_arg,
                 List<Item>& fields_arg,
                 bool is_concurrent_arg,
                 enum enum_duplicates handle_dup, bool ignore,
                 bool using_trans);
  void set_fields(const char* db, List<Item> &fields_arg,
                  Name_resolution_context *context);
  const char* get_db() { return db; }
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info, bool commented);
#endif

  /*
    Note that for all the events related to LOAD DATA (Load_log_event,
    Create_file/Append/Exec/Delete, we pass description_event; however as
    logging of LOAD DATA is going to be changed in 4.1 or 5.0, this is only used
    for the common_header_len (post_header_len will not be changed).
  */
  Load_log_event(const char* buf, uint event_len,
                 const Format_description_log_event* description_event);
  ~Load_log_event()
  {}
  Log_event_type get_type_code()
  {
    return sql_ex.new_format() ? NEW_LOAD_EVENT: LOAD_EVENT;
  }
#ifdef MYSQL_SERVER
  bool write_data_header(IO_CACHE* file);
  bool write_data_body(IO_CACHE* file);
#endif
  bool is_valid() const { return table_name != 0; }
  int get_data_size()
  {
    return (table_name_len + db_len + 2 + fname_len
            + LOAD_HEADER_LEN
            + sql_ex.data_size() + field_block_len + num_fields);
  }

public:        /* !!! Public in this patch to allow old usage */
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const* rli)
  {
    return do_apply_event(thd->slave_net,rli,0);
  }

  int do_apply_event(NET *net, Relay_log_info const *rli,
                     bool use_rli_only_for_errors);
#endif
};

extern char server_version[SERVER_VERSION_LENGTH];

class Start_log_event_v3: public Log_event
{
public:
  /*
    If this event is at the start of the first binary log since server
    startup 'created' should be the timestamp when the event (and the
    binary log) was created.  In the other case (i.e. this event is at
    the start of a binary log created by FLUSH LOGS or automatic
    rotation), 'created' should be 0.  This "trick" is used by MySQL
    >=4.0.14 slaves to know whether they must drop stale temporary
    tables and whether they should abort unfinished transaction.

    Note that when 'created'!=0, it is always equal to the event's
    timestamp; indeed Start_log_event is written only in log.cc where
    the first constructor below is called, in which 'created' is set
    to 'when'.  So in fact 'created' is a useless variable. When it is
    0 we can read the actual value from timestamp ('when') and when it
    is non-zero we can read the same value from timestamp
    ('when'). Conclusion:
     - we use timestamp to print when the binlog was created.
     - we use 'created' only to know if this is a first binlog or not.
     In 3.23.57 we did not pay attention to this identity, so mysqlbinlog in
     3.23.57 does not print 'created the_date' if created was zero. This is now
     fixed.
  */
  time_t created;
  uint16 binlog_version;
  char server_version[ST_SERVER_VER_LEN];
  /*
    We set this to 1 if we don't want to have the created time in the log,
    which is the case when we rollover to a new log.
  */
  bool dont_set_created;

#ifdef MYSQL_SERVER
  Start_log_event_v3();
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  Start_log_event_v3() {}
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Start_log_event_v3(const char* buf, uint event_len,
                     const Format_description_log_event* description_event);
  ~Start_log_event_v3() {}
  Log_event_type get_type_code() { return START_EVENT_V3;}
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif
  bool is_valid() const { return server_version[0] != 0; }
  int get_data_size()
  {
    return START_V3_HEADER_LEN; //no variable-sized part
  }

protected:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info*)
  {
    /*
      Events from ourself should be skipped, but they should not
      decrease the slave skip counter.
     */
    if (this->server_id == ::server_id)
      return Log_event::EVENT_SKIP_IGNORE;
    else
      return Log_event::EVENT_SKIP_NOT;
  }
#endif
};


class Format_description_log_event: public Start_log_event_v3
{
public:
  /*
     The size of the fixed header which _all_ events have
     (for binlogs written by this version, this is equal to
     LOG_EVENT_HEADER_LEN), except FORMAT_DESCRIPTION_EVENT and ROTATE_EVENT
     (those have a header of size LOG_EVENT_MINIMAL_HEADER_LEN).
  */
  uint8 common_header_len;
  uint8 number_of_event_types;
  /* 
     The list of post-headers' lengths followed 
     by the checksum alg decription byte
  */
  uint8 *post_header_len;
  uchar server_version_split[3];
  const uint8 *event_type_permutation;

  Format_description_log_event(uint8 binlog_ver, const char* server_ver=0);
  Format_description_log_event(const char* buf, uint event_len,
                               const Format_description_log_event
                               *description_event);
  ~Format_description_log_event()
  {
    my_free(post_header_len);
  }
  Log_event_type get_type_code() { return FORMAT_DESCRIPTION_EVENT;}
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif
  bool header_is_valid() const
  {
    return ((common_header_len >= ((binlog_version==1) ? OLD_HEADER_LEN :
                                   LOG_EVENT_MINIMAL_HEADER_LEN)) &&
            (post_header_len != NULL));
  }

  bool version_is_valid() const
  {
    /* It is invalid only when all version numbers are 0 */
    return !(server_version_split[0] == 0 &&
             server_version_split[1] == 0 &&
             server_version_split[2] == 0);
  }

  bool is_valid() const
  {
    return header_is_valid() && version_is_valid();
  }

  int get_data_size()
  {
    /*
      The vector of post-header lengths is considered as part of the
      post-header, because in a given version it never changes (contrary to the
      query in a Query_log_event).
    */
    return FORMAT_DESCRIPTION_HEADER_LEN;
  }

  void calc_server_version_split();
  ulong get_version_product() const;
  bool is_version_before_checksum() const;
protected:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


class Intvar_log_event: public Log_event
{
public:
  ulonglong val;
  uchar type;

#ifdef MYSQL_SERVER
  Intvar_log_event(THD* thd_arg, uchar type_arg, ulonglong val_arg,
                   enum_event_cache_type cache_type_arg,
                   enum_event_logging_type logging_type_arg)
    :Log_event(thd_arg, 0, cache_type_arg, logging_type_arg),
    val(val_arg), type(type_arg) { }
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Intvar_log_event(const char* buf,
                   const Format_description_log_event *description_event);
  ~Intvar_log_event() {}
  Log_event_type get_type_code() { return INTVAR_EVENT;}
  const char* get_var_type_name();
  int get_data_size() { return  9; /* sizeof(type) + sizeof(val) */;}
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif
  bool is_valid() const { return 1; }

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


class Rand_log_event: public Log_event
{
 public:
  ulonglong seed1;
  ulonglong seed2;

#ifdef MYSQL_SERVER
  Rand_log_event(THD* thd_arg, ulonglong seed1_arg, ulonglong seed2_arg,
                 enum_event_cache_type cache_type_arg,
                 enum_event_logging_type logging_type_arg)
    :Log_event(thd_arg, 0, cache_type_arg, logging_type_arg),
    seed1(seed1_arg), seed2(seed2_arg) { }
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Rand_log_event(const char* buf,
                 const Format_description_log_event *description_event);
  ~Rand_log_event() {}
  Log_event_type get_type_code() { return RAND_EVENT;}
  int get_data_size() { return 16; /* sizeof(ulonglong) * 2*/ }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif
  bool is_valid() const { return 1; }

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};

#ifdef MYSQL_CLIENT
typedef ulonglong my_xid; // this line is the same as in handler.h
#endif

class Xid_log_event: public Log_event
{
 public:
   my_xid xid;

#ifdef MYSQL_SERVER
  Xid_log_event(THD* thd_arg, my_xid x)
  : Log_event(thd_arg, 0, 
              Log_event::EVENT_TRANSACTIONAL_CACHE,
              Log_event::EVENT_NORMAL_LOGGING),
  xid(x)
  { }
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Xid_log_event(const char* buf,
                const Format_description_log_event *description_event);
  ~Xid_log_event() {}
  Log_event_type get_type_code() { return XID_EVENT;}
  int get_data_size() { return sizeof(xid); }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif
  bool is_valid() const { return 1; }
  virtual bool ends_group() { return TRUE; }
private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_apply_event_worker(Slave_worker *rli);
  enum_skip_reason do_shall_skip(Relay_log_info *rli);
  bool do_commit(THD *thd);
#endif
};

class User_var_log_event: public Log_event
{
public:
  enum {
    UNDEF_F= 0,
    UNSIGNED_F= 1
  };
  const char *name;
  uint name_len;
  char *val;
  ulong val_len;
  Item_result type;
  uint charset_number;
  bool is_null;
  uchar flags;
#ifdef MYSQL_SERVER
  bool deferred;
  query_id_t query_id;
  User_var_log_event(THD* thd_arg, const char *name_arg, uint name_len_arg,
                     char *val_arg, ulong val_len_arg, Item_result type_arg,
                     uint charset_number_arg, uchar flags_arg,
                     enum_event_cache_type cache_type_arg,
                     enum_event_logging_type logging_type_arg)
    :Log_event(thd_arg, 0, cache_type_arg, logging_type_arg), name(name_arg),
     name_len(name_len_arg), val(val_arg), val_len(val_len_arg), type(type_arg),
     charset_number(charset_number_arg), flags(flags_arg), deferred(false)
    { 
      is_null= !val;
    }
  int pack_info(Protocol* protocol);
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  User_var_log_event(const char* buf, uint event_len,
                     const Format_description_log_event *description_event);
  ~User_var_log_event() {}
  Log_event_type get_type_code() { return USER_VAR_EVENT;}
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
  /* 
     Getter and setter for deferred User-event. 
     Returns true if the event is not applied directly 
     and which case the applier adjusts execution path.
  */
  bool is_deferred() { return deferred; }
  /*
    In case of the deffered applying the variable instance is flagged
    and the parsing time query id is stored to be used at applying time.
  */
  void set_deferred(query_id_t qid) { deferred= true; query_id= qid; }
#endif
  bool is_valid() const { return name != 0; }

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


class Stop_log_event: public Log_event
{
public:
#ifdef MYSQL_SERVER
  Stop_log_event() :Log_event()
  {}
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Stop_log_event(const char* buf,
                 const Format_description_log_event *description_event):
    Log_event(buf, description_event)
  {}
  ~Stop_log_event() {}
  Log_event_type get_type_code() { return STOP_EVENT;}
  bool is_valid() const { return 1; }

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli)
  {
    /*
      Events from ourself should be skipped, but they should not
      decrease the slave skip counter.
     */
    if (this->server_id == ::server_id)
      return Log_event::EVENT_SKIP_IGNORE;
    else
      return Log_event::EVENT_SKIP_NOT;
  }
#endif
};

class Rotate_log_event: public Log_event
{
public:
  enum {
    DUP_NAME= 2, // if constructor should dup the string argument
    RELAY_LOG=4  // rotate event for relay log
  };
  const char* new_log_ident;
  ulonglong pos;
  uint ident_len;
  uint flags;
#ifdef MYSQL_SERVER
  Rotate_log_event(const char* new_log_ident_arg,
                   uint ident_len_arg,
                   ulonglong pos_arg, uint flags);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Rotate_log_event(const char* buf, uint event_len,
                   const Format_description_log_event* description_event);
  ~Rotate_log_event()
  {
    if (flags & DUP_NAME)
      my_free((void*) new_log_ident);
  }
  Log_event_type get_type_code() { return ROTATE_EVENT;}
  int get_data_size() { return  ident_len + ROTATE_HEADER_LEN;}
  bool is_valid() const { return new_log_ident != 0; }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


/* the classes below are for the new LOAD DATA INFILE logging */

class Create_file_log_event: public Load_log_event
{
protected:
  /*
    Pretend we are Load event, so we can write out just
    our Load part - used on the slave when writing event out to
    SQL_LOAD-*.info file
  */
  bool fake_base;
public:
  uchar* block;
  const char *event_buf;
  uint block_len;
  uint file_id;
  bool inited_from_old;

#ifdef MYSQL_SERVER
  Create_file_log_event(THD* thd, sql_exchange* ex, const char* db_arg,
                        const char* table_name_arg,
                        List<Item>& fields_arg,
                        bool is_concurrent_arg,
                        enum enum_duplicates handle_dup, bool ignore,
                        uchar* block_arg, uint block_len_arg,
                        bool using_trans);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info,
             bool enable_local);
#endif

  Create_file_log_event(const char* buf, uint event_len,
                        const Format_description_log_event* description_event);
  ~Create_file_log_event()
  {
    my_free((void*) event_buf);
  }

  Log_event_type get_type_code()
  {
    return fake_base ? Load_log_event::get_type_code() : CREATE_FILE_EVENT;
  }
  int get_data_size()
  {
    return (fake_base ? Load_log_event::get_data_size() :
            Load_log_event::get_data_size() +
            4 + 1 + block_len);
  }
  bool is_valid() const { return inited_from_old || block != 0; }
#ifdef MYSQL_SERVER
  bool write_data_header(IO_CACHE* file);
  bool write_data_body(IO_CACHE* file);
  /*
    Cut out Create_file extentions and
    write it as Load event - used on the slave
  */
  bool write_base(IO_CACHE* file);
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif
};


class Append_block_log_event: public Log_event
{
public:
  uchar* block;
  uint block_len;
  uint file_id;
  /*
    'db' is filled when the event is created in mysql_load() (the
    event needs to have a 'db' member to be well filtered by
    binlog-*-db rules). 'db' is not written to the binlog (it's not
    used by Append_block_log_event::write()), so it can't be read in
    the Append_block_log_event(const char* buf, int event_len)
    constructor.  In other words, 'db' is used only for filtering by
    binlog-*-db rules.  Create_file_log_event is different: it's 'db'
    (which is inherited from Load_log_event) is written to the binlog
    and can be re-read.
  */
  const char* db;

#ifdef MYSQL_SERVER
  Append_block_log_event(THD* thd, const char* db_arg, uchar* block_arg,
                         uint block_len_arg, bool using_trans);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
  virtual int get_create_or_append() const;
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Append_block_log_event(const char* buf, uint event_len,
                         const Format_description_log_event
                         *description_event);
  ~Append_block_log_event() {}
  Log_event_type get_type_code() { return APPEND_BLOCK_EVENT;}
  int get_data_size() { return  block_len + APPEND_BLOCK_HEADER_LEN ;}
  bool is_valid() const { return block != 0; }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
  const char* get_db() { return db; }
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif
};


class Delete_file_log_event: public Log_event
{
public:
  uint file_id;
  const char* db; /* see comment in Append_block_log_event */

#ifdef MYSQL_SERVER
  Delete_file_log_event(THD* thd, const char* db_arg, bool using_trans);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info,
             bool enable_local);
#endif

  Delete_file_log_event(const char* buf, uint event_len,
                        const Format_description_log_event* description_event);
  ~Delete_file_log_event() {}
  Log_event_type get_type_code() { return DELETE_FILE_EVENT;}
  int get_data_size() { return DELETE_FILE_HEADER_LEN ;}
  bool is_valid() const { return file_id != 0; }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
  const char* get_db() { return db; }
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif
};


class Execute_load_log_event: public Log_event
{
public:
  uint file_id;
  const char* db; /* see comment in Append_block_log_event */

#ifdef MYSQL_SERVER
  Execute_load_log_event(THD* thd, const char* db_arg, bool using_trans);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
#endif

  Execute_load_log_event(const char* buf, uint event_len,
                         const Format_description_log_event
                         *description_event);
  ~Execute_load_log_event() {}
  Log_event_type get_type_code() { return EXEC_LOAD_EVENT;}
  int get_data_size() { return  EXEC_LOAD_HEADER_LEN ;}
  bool is_valid() const { return file_id != 0; }
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file);
  const char* get_db() { return db; }
#endif
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual uint8 mts_number_dbs() { return OVER_MAX_DBS_IN_EVENT_MTS; }
  virtual uint8 get_mts_dbs(Mts_db_names *arg)
  {
    return arg->num= mts_number_dbs();
  }
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif
};


class Begin_load_query_log_event: public Append_block_log_event
{
public:
#ifdef MYSQL_SERVER
  Begin_load_query_log_event(THD* thd_arg, const char *db_arg,
                             uchar* block_arg, uint block_len_arg,
                             bool using_trans);
#ifdef HAVE_REPLICATION
  Begin_load_query_log_event(THD* thd);
  int get_create_or_append() const;
#endif /* HAVE_REPLICATION */
#endif
  Begin_load_query_log_event(const char* buf, uint event_len,
                             const Format_description_log_event
                             *description_event);
  ~Begin_load_query_log_event() {}
  Log_event_type get_type_code() { return BEGIN_LOAD_QUERY_EVENT; }
private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif
};


/*
  Elements of this enum describe how LOAD DATA handles duplicates.
*/
enum enum_load_dup_handling { LOAD_DUP_ERROR= 0, LOAD_DUP_IGNORE,
                              LOAD_DUP_REPLACE };

class Execute_load_query_log_event: public Query_log_event
{
public:
  uint file_id;       // file_id of temporary file
  uint fn_pos_start;  // pointer to the part of the query that should
                      // be substituted
  uint fn_pos_end;    // pointer to the end of this part of query
  /*
    We have to store type of duplicate handling explicitly, because
    for LOAD DATA it also depends on LOCAL option. And this part
    of query will be rewritten during replication so this information
    may be lost...
  */
  enum_load_dup_handling dup_handling;

#ifdef MYSQL_SERVER
  Execute_load_query_log_event(THD* thd, const char* query_arg,
                               ulong query_length, uint fn_pos_start_arg,
                               uint fn_pos_end_arg,
                               enum_load_dup_handling dup_handling_arg,
                               bool using_trans, bool immediate,
                               bool suppress_use, int errcode);
#ifdef HAVE_REPLICATION
  int pack_info(Protocol* protocol);
#endif /* HAVE_REPLICATION */
#else
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
  /* Prints the query as LOAD DATA LOCAL and with rewritten filename */
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info,
             const char *local_fname);
#endif
  Execute_load_query_log_event(const char* buf, uint event_len,
                               const Format_description_log_event
                               *description_event);
  ~Execute_load_query_log_event() {}

  Log_event_type get_type_code() { return EXECUTE_LOAD_QUERY_EVENT; }
  bool is_valid() const { return Query_log_event::is_valid() && file_id != 0; }

  ulong get_post_header_size_for_derived();
#ifdef MYSQL_SERVER
  bool write_post_header_for_derived(IO_CACHE* file);
#endif

private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif
};


#ifdef MYSQL_CLIENT

class Unknown_log_event: public Log_event
{
public:
  /*
    Even if this is an unknown event, we still pass description_event to
    Log_event's ctor, this way we can extract maximum information from the
    event's header (the unique ID for example).
  */
  Unknown_log_event(const char* buf,
                    const Format_description_log_event *description_event):
    Log_event(buf, description_event)
  {}
  ~Unknown_log_event() {}
  void print(FILE* file, PRINT_EVENT_INFO* print_event_info);
  Log_event_type get_type_code() { return UNKNOWN_EVENT;}
  bool is_valid() const { return 1; }
};
#endif
char *str_to_hex(char *to, const char *from, uint len);

class Table_map_log_event : public Log_event
{
public:
  /* Constants */
  enum
  {
    TYPE_CODE = TABLE_MAP_EVENT
  };

  enum enum_error
  {
    ERR_OPEN_FAILURE = -1,               
    ERR_OK = 0,                                 
    ERR_TABLE_LIMIT_EXCEEDED = 1,      
    ERR_OUT_OF_MEM = 2,                         
    ERR_BAD_TABLE_DEF = 3,     
    ERR_RBR_TO_SBR = 4  
  };

  enum enum_flag
  {
    /* 
       Nothing here right now, but the flags support is there in
       preparation for changes that are coming.  Need to add a
       constant to make it compile under HP-UX: aCC does not like
       empty enumerations.
    */
    ENUM_FLAG_COUNT
  };

  typedef uint16 flag_set;

  /* Special constants representing sets of flags */
  enum 
  {
    TM_NO_FLAGS = 0U,
    TM_BIT_LEN_EXACT_F = (1U << 0),
    TM_REFERRED_FK_DB_F = (1U << 1)
  };

  flag_set get_flags(flag_set flag) const { return m_flags & flag; }

#ifdef MYSQL_SERVER
  Table_map_log_event(THD *thd, TABLE *tbl, const Table_id& tid,
                      bool is_transactional);
#endif
#ifdef HAVE_REPLICATION
  Table_map_log_event(const char *buf, uint event_len, 
                      const Format_description_log_event *description_event);
#endif

  ~Table_map_log_event();

#ifdef MYSQL_CLIENT
  table_def *create_table_def()
  {
    return new table_def(m_coltype, m_colcnt, m_field_metadata,
                         m_field_metadata_size, m_null_bits, m_flags);
  }
#endif
  const Table_id& get_table_id() const { return m_table_id; }
  const char *get_table_name() const { return m_tblnam; }
  const char *get_db_name() const    { return m_dbnam; }

  virtual Log_event_type get_type_code() { return TABLE_MAP_EVENT; }
  virtual bool is_valid() const { return m_memory != NULL; /* we check malloc */ }

  virtual int get_data_size() { return (uint) m_data_size; }
#ifdef MYSQL_SERVER
  virtual int save_field_metadata();
  virtual bool write_data_header(IO_CACHE *file);
  virtual bool write_data_body(IO_CACHE *file);
  virtual const char *get_db() { return m_dbnam; }
  virtual uint8 mts_number_dbs()
  {
    return get_flags(TM_REFERRED_FK_DB_F) ? OVER_MAX_DBS_IN_EVENT_MTS : 1;
  }
  virtual uint8 get_mts_dbs(Mts_db_names *arg)
  {
    const char *db_name= get_db();

    if (!rpl_filter->is_rewrite_empty() && !get_flags(TM_REFERRED_FK_DB_F))
    {
      size_t dummy_len;
      const char *db_filtered= rpl_filter->get_rewrite_db(db_name, &dummy_len);
      // db_name != db_filtered means that db_name is rewritten.
      if (strcmp(db_name, db_filtered))
        db_name= db_filtered;
    }

    if (!get_flags(TM_REFERRED_FK_DB_F))
      arg->name[0]= db_name;

    return arg->num= mts_number_dbs();
  }

#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int pack_info(Protocol *protocol);
#endif

#ifdef MYSQL_CLIENT
  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif


private:
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);
#endif

#ifdef MYSQL_SERVER
  TABLE         *m_table;
#endif
  char const    *m_dbnam;
  size_t         m_dblen;
  char const    *m_tblnam;
  size_t         m_tbllen;
  ulong          m_colcnt;
  uchar         *m_coltype;

  uchar         *m_memory;
  Table_id       m_table_id;
  flag_set       m_flags;

  size_t         m_data_size;

  uchar          *m_field_metadata;        // buffer for field metadata
  /*
    The size of field metadata buffer set by calling save_field_metadata()
  */
  ulong          m_field_metadata_size;   
  uchar         *m_null_bits;
  uchar         *m_meta_memory;
};


class Rows_log_event : public Log_event
{
public:
  enum row_lookup_mode {
       ROW_LOOKUP_UNDEFINED= 0,
       ROW_LOOKUP_NOT_NEEDED= 1,
       ROW_LOOKUP_INDEX_SCAN= 2,
       ROW_LOOKUP_TABLE_SCAN= 3,
       ROW_LOOKUP_HASH_SCAN= 4
  };

  enum enum_error
  {
    ERR_OPEN_FAILURE = -1,               
    ERR_OK = 0,                                 
    ERR_TABLE_LIMIT_EXCEEDED = 1,      
    ERR_OUT_OF_MEM = 2,                         
    ERR_BAD_TABLE_DEF = 3,     
    ERR_RBR_TO_SBR = 4  
  };

  /*
    These definitions allow you to combine the flags into an
    appropriate flag set using the normal bitwise operators.  The
    implicit conversion from an enum-constant to an integer is
    accepted by the compiler, which is then used to set the real set
    of flags.
  */
  enum enum_flag
  {
    /* Last event of a statement */
    STMT_END_F = (1U << 0),

    /* Value of the OPTION_NO_FOREIGN_KEY_CHECKS flag in thd->options */
    NO_FOREIGN_KEY_CHECKS_F = (1U << 1),

    /* Value of the OPTION_RELAXED_UNIQUE_CHECKS flag in thd->options */
    RELAXED_UNIQUE_CHECKS_F = (1U << 2),

    COMPLETE_ROWS_F = (1U << 3)
  };

  typedef uint16 flag_set;

  /* Special constants representing sets of flags */
  enum 
  {
      RLE_NO_FLAGS = 0U
  };

  virtual ~Rows_log_event();

  void set_flags(flag_set flags_arg) { m_flags |= flags_arg; }
  void clear_flags(flag_set flags_arg) { m_flags &= ~flags_arg; }
  flag_set get_flags(flag_set flags_arg) const { return m_flags & flags_arg; }

  Log_event_type get_type_code() { return m_type; } /* Specific type (_V1 etc) */
  virtual Log_event_type get_general_type_code() = 0; /* General rows op type, no version */

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int pack_info(Protocol *protocol);
#endif

#ifdef MYSQL_CLIENT
  /* not for direct call, each derived has its own ::print() */
  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info)= 0;
  void print_verbose(IO_CACHE *file,
                     PRINT_EVENT_INFO *print_event_info);
  size_t print_verbose_one_row(IO_CACHE *file, table_def *td,
                               PRINT_EVENT_INFO *print_event_info,
                               MY_BITMAP *cols_bitmap,
                               const uchar *ptr, const uchar *prefix);
#endif

#ifdef MYSQL_SERVER
  int add_row_data(uchar *data, size_t length)
  {
    return do_add_row_data(data,length); 
  }
#endif

  /* Member functions to implement superclass interface */
  virtual int get_data_size();

  MY_BITMAP const *get_cols() const { return &m_cols; }
  MY_BITMAP const *get_cols_ai() const { return &m_cols_ai; }
  size_t get_width() const          { return m_width; }
  const Table_id& get_table_id() const        { return m_table_id; }

#if defined(MYSQL_SERVER)
  /*
    This member function compares the table's read/write_set
    with this event's m_cols and m_cols_ai. Comparison takes 
    into account what type of rows event is this: Delete, Write or
    Update, therefore it uses the correct m_cols[_ai] according
    to the event type code.

    Note that this member function should only be called for the
    following events:
    - Delete_rows_log_event
    - Write_rows_log_event
    - Update_rows_log_event

    @param[IN] table The table to compare this events bitmaps 
                     against.

    @return TRUE if sets match, FALSE otherwise. (following 
                 bitmap_cmp return logic).

   */
  virtual bool read_write_bitmaps_cmp(TABLE *table)
  {
    bool res= FALSE;

    switch (get_general_type_code())
    {
      case DELETE_ROWS_EVENT:
        res= bitmap_cmp(get_cols(), table->read_set);
        break;
      case UPDATE_ROWS_EVENT:
        res= (bitmap_cmp(get_cols(), table->read_set) &&
              bitmap_cmp(get_cols_ai(), table->write_set));
        break;
      case WRITE_ROWS_EVENT:
        res= bitmap_cmp(get_cols(), table->write_set);
        break;
      default:
        /* 
          We should just compare bitmaps for Delete, Write
          or Update rows events.
        */
        DBUG_ASSERT(0);
    }
    return res;
  }
#endif

#ifdef MYSQL_SERVER
  virtual bool write_data_header(IO_CACHE *file);
  virtual bool write_data_body(IO_CACHE *file);
  virtual const char *get_db() { return m_table->s->db.str; }
#endif
  /*
    Check that malloc() succeeded in allocating memory for the rows
    buffer and the COLS vector. Checking that an Update_rows_log_event
    is valid is done in the Update_rows_log_event::is_valid()
    function.
  */
  virtual bool is_valid() const
  {
    return m_rows_buf && m_cols.bitmap;
  }

  uint     m_row_count;         /* The number of rows added to the event */

  const uchar* get_extra_row_data() const   { return m_extra_row_data; }

protected:
  /* 
     The constructors are protected since you're supposed to inherit
     this class, not create instances of this class.
  */
#ifdef MYSQL_SERVER
  Rows_log_event(THD*, TABLE*, const Table_id& table_id,
                 MY_BITMAP const *cols, bool is_transactional,
                 Log_event_type event_type,
                 const uchar* extra_row_info);
#endif
  Rows_log_event(const char *row_data, uint event_len, 
                 const Format_description_log_event *description_event);

#ifdef MYSQL_CLIENT
  void print_helper(FILE *, PRINT_EVENT_INFO *, char const *const name);
#endif

#ifdef MYSQL_SERVER
  virtual int do_add_row_data(uchar *data, size_t length);
#endif

#ifdef MYSQL_SERVER
  TABLE *m_table;               /* The table the rows belong to */
#endif
  Table_id    m_table_id;       /* Table ID */
  MY_BITMAP   m_cols;           /* Bitmap denoting columns available */
  ulong       m_width;          /* The width of the columns bitmap */
#ifndef MYSQL_CLIENT

  Hash_slave_rows m_hash;

  uint            m_rows_lookup_algorithm;  
#endif
  /*
    Bitmap for columns available in the after image, if present. These
    fields are only available for Update_rows events. Observe that the
    width of both the before image COLS vector and the after image
    COLS vector is the same: the number of columns of the table on the
    master.
  */
  MY_BITMAP   m_cols_ai;

  ulong       m_master_reclength; /* Length of record on master side */

  /* Bit buffers in the same memory as the class */
  uint32    m_bitbuf[128/(sizeof(uint32)*8)];
  uint32    m_bitbuf_ai[128/(sizeof(uint32)*8)];

  uchar    *m_rows_buf;         /* The rows in packed format */
  uchar    *m_rows_cur;         /* One-after the end of the data */
  uchar    *m_rows_end;         /* One-after the end of the allocated space */

  flag_set m_flags;             /* Flags for row-level events */

  Log_event_type m_type;        /* Actual event type */

  uchar    *m_extra_row_data;   /* Pointer to extra row data if any */
                                /* If non null, first byte is length */

  /* helper functions */

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  const uchar *m_curr_row;     /* Start of the row being processed */
  const uchar *m_curr_row_end; /* One-after the end of the current row */
  uchar    *m_key;      /* Buffer to keep key value during searches */
  uint     m_key_index;
  KEY      *m_key_info; /* Points to description of index #m_key_index */
  class Key_compare
  {
public:
    Key_compare(KEY **ki= NULL) : m_key_info(ki) {}
    bool operator()(uchar *k1, uchar *k2) const
    {
      return key_cmp2((*m_key_info)->key_part,
                      k1, (*m_key_info)->key_length,
                      k2, (*m_key_info)->key_length) < 0 ;
    }
private:
    KEY **m_key_info;
  };
  std::set<uchar *, Key_compare> m_distinct_keys;
  std::set<uchar *, Key_compare>::iterator m_itr;
  uchar *m_distinct_key_spare_buf;

  // Unpack the current row into m_table->record[0]
  int unpack_current_row(const Relay_log_info *const rli,
                         MY_BITMAP const *cols)
  { 
    DBUG_ASSERT(m_table);

    ASSERT_OR_RETURN_ERROR(m_curr_row <= m_rows_end, HA_ERR_CORRUPT_EVENT);
    return ::unpack_row(rli, m_table, m_width, m_curr_row, cols,
                                   &m_curr_row_end, &m_master_reclength, m_rows_end);
  }

  /*
    This member function is called when deciding the algorithm to be used to
    find the rows to be updated on the slave during row based replication.
    This this functions sets the m_rows_lookup_algorithm and also the
    m_key_index with the key index to be used if the algorithm is dependent on
    an index.
   */
  void decide_row_lookup_algorithm_and_key();

  /*
    Encapsulates the  operations to be done before applying
    row event for update and delete.
   */
  int row_operations_scan_and_key_setup();

  /*
   Encapsulates the  operations to be done after applying
   row event for update and delete.
  */
  int row_operations_scan_and_key_teardown(int error);

  inline bool is_auto_inc_in_extra_columns()
  {
    DBUG_ASSERT(m_table);
    return (m_table->next_number_field &&
            m_table->next_number_field->field_index >= m_width);
  }
#endif

private:

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
  virtual int do_update_pos(Relay_log_info *rli);
  virtual enum_skip_reason do_shall_skip(Relay_log_info *rli);

  /*
    Primitive to prepare for a sequence of row executions.

    DESCRIPTION

      Before doing a sequence of do_prepare_row() and do_exec_row()
      calls, this member function should be called to prepare for the
      entire sequence. Typically, this member function will allocate
      space for any buffers that are needed for the two member
      functions mentioned above.

    RETURN VALUE

      The member function will return 0 if all went OK, or a non-zero
      error code otherwise.
  */
  virtual 
  int do_before_row_operations(const Slave_reporting_capability *const log) = 0;

  /*
    Primitive to clean up after a sequence of row executions.

    DESCRIPTION
    
      After doing a sequence of do_prepare_row() and do_exec_row(),
      this member function should be called to clean up and release
      any allocated buffers.
      
      The error argument, if non-zero, indicates an error which happened during
      row processing before this function was called. In this case, even if 
      function is successful, it should return the error code given in the argument.
  */
  virtual 
  int do_after_row_operations(const Slave_reporting_capability *const log,
                              int error) = 0;

  /*
    Primitive to do the actual execution necessary for a row.

    DESCRIPTION
      The member function will do the actual execution needed to handle a row.
      The row is located at m_curr_row. When the function returns, 
      m_curr_row_end should point at the next row (one byte after the end
      of the current row).    

    RETURN VALUE
      0 if execution succeeded, 1 if execution failed.
      
  */
  virtual int do_exec_row(const Relay_log_info *const rli) = 0;

  int handle_idempotent_and_ignored_errors(Relay_log_info const *rli, int *err);

  void do_post_row_operations(Relay_log_info const *rli, int err);

  int do_apply_row(Relay_log_info const *rli);

  int do_index_scan_and_update(Relay_log_info const *rli);
  
  int do_hash_scan_and_update(Relay_log_info const *rli);

  int do_table_scan_and_update(Relay_log_info const *rli);

  int open_record_scan();

  int close_record_scan();

  int next_record_scan(bool first_read);

  int add_key_to_distinct_keyset();

  int do_hash_row(Relay_log_info const *rli);

  int do_scan_and_update(Relay_log_info const *rli);
#endif /* defined(MYSQL_SERVER) && defined(HAVE_REPLICATION) */

  friend class Old_rows_log_event;
};

class Write_rows_log_event : public Rows_log_event
{
public:
  enum 
  {
    /* Support interface to THD::binlog_prepare_pending_rows_event */
    TYPE_CODE = WRITE_ROWS_EVENT
  };

#if defined(MYSQL_SERVER)
  Write_rows_log_event(THD*, TABLE*, const Table_id& table_id,
                       bool is_transactional,
                       const uchar* extra_row_info);
#endif
#ifdef HAVE_REPLICATION
  Write_rows_log_event(const char *buf, uint event_len, 
                       const Format_description_log_event *description_event);
#endif
#if defined(MYSQL_SERVER) 
  static bool binlog_row_logging_function(THD *thd, TABLE *table,
                                          bool is_transactional,
                                          const uchar *before_record
                                          __attribute__((unused)),
                                          const uchar *after_record)
  {
    return thd->binlog_write_row(table, is_transactional,
                                 after_record, NULL);
  }
#endif

protected:
  int write_row(const Relay_log_info *const, const bool);

private:
  virtual Log_event_type get_general_type_code() { return (Log_event_type)TYPE_CODE; }

#ifdef MYSQL_CLIENT
  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_before_row_operations(const Slave_reporting_capability *const);
  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
  virtual int do_exec_row(const Relay_log_info *const);
#endif
};


class Update_rows_log_event : public Rows_log_event
{
public:
  enum 
  {
    /* Support interface to THD::binlog_prepare_pending_rows_event */
    TYPE_CODE = UPDATE_ROWS_EVENT
  };

#ifdef MYSQL_SERVER
  Update_rows_log_event(THD*, TABLE*, const Table_id& table_id,
                        MY_BITMAP const *cols_bi,
                        MY_BITMAP const *cols_ai,
                        bool is_transactional,
                        const uchar* extra_row_info);

  Update_rows_log_event(THD*, TABLE*, const Table_id& table_id,
                        bool is_transactional,
                        const uchar* extra_row_info);

  void init(MY_BITMAP const *cols);
#endif

  virtual ~Update_rows_log_event();

#ifdef HAVE_REPLICATION
  Update_rows_log_event(const char *buf, uint event_len, 
                        const Format_description_log_event *description_event);
#endif

#ifdef MYSQL_SERVER
  static bool binlog_row_logging_function(THD *thd, TABLE *table,
                                          bool is_transactional,
                                          const uchar *before_record,
                                          const uchar *after_record)
  {
    return thd->binlog_update_row(table, is_transactional,
                                  before_record, after_record, NULL);
  }
#endif

  virtual bool is_valid() const
  {
    return Rows_log_event::is_valid() && m_cols_ai.bitmap;
  }

protected:
  virtual Log_event_type get_general_type_code() { return (Log_event_type)TYPE_CODE; }

#ifdef MYSQL_CLIENT
  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_before_row_operations(const Slave_reporting_capability *const);
  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
  virtual int do_exec_row(const Relay_log_info *const);
#endif /* defined(MYSQL_SERVER) && defined(HAVE_REPLICATION) */
};

class Delete_rows_log_event : public Rows_log_event
{
public:
  enum 
  {
    /* Support interface to THD::binlog_prepare_pending_rows_event */
    TYPE_CODE = DELETE_ROWS_EVENT
  };

#ifdef MYSQL_SERVER
  Delete_rows_log_event(THD*, TABLE*, const Table_id&,
                        bool is_transactional, const uchar* extra_row_info);
#endif
#ifdef HAVE_REPLICATION
  Delete_rows_log_event(const char *buf, uint event_len, 
                        const Format_description_log_event *description_event);
#endif
#ifdef MYSQL_SERVER
  static bool binlog_row_logging_function(THD *thd, TABLE *table,
                                          bool is_transactional,
                                          const uchar *before_record,
                                          const uchar *after_record
                                          __attribute__((unused)))
  {
    return thd->binlog_delete_row(table, is_transactional,
                                  before_record, NULL);
  }
#endif
  
protected:
  virtual Log_event_type get_general_type_code() { return (Log_event_type)TYPE_CODE; }

#ifdef MYSQL_CLIENT
  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_before_row_operations(const Slave_reporting_capability *const);
  virtual int do_after_row_operations(const Slave_reporting_capability *const,int);
  virtual int do_exec_row(const Relay_log_info *const);
#endif
};


#include "log_event_old.h"

class Incident_log_event : public Log_event {
public:
#ifdef MYSQL_SERVER
  Incident_log_event(THD *thd_arg, Incident incident)
    : Log_event(thd_arg, LOG_EVENT_NO_FILTER_F, Log_event::EVENT_NO_CACHE,
                Log_event::EVENT_IMMEDIATE_LOGGING), m_incident(incident)
  {
    DBUG_ENTER("Incident_log_event::Incident_log_event");
    DBUG_PRINT("enter", ("m_incident: %d", m_incident));
    m_message.str= NULL;                    /* Just as a precaution */
    m_message.length= 0;
    DBUG_VOID_RETURN;
  }

  Incident_log_event(THD *thd_arg, Incident incident, LEX_STRING const msg)
    : Log_event(thd_arg, LOG_EVENT_NO_FILTER_F,
                Log_event::EVENT_NO_CACHE,
                Log_event::EVENT_IMMEDIATE_LOGGING), m_incident(incident)
  {
    DBUG_ENTER("Incident_log_event::Incident_log_event");
    DBUG_PRINT("enter", ("m_incident: %d", m_incident));
    m_message.str= NULL;
    m_message.length= 0;
    if (!(m_message.str= (char*) my_malloc(msg.length+1, MYF(MY_WME))))
    {
      /* Mark this event invalid */
      m_incident= INCIDENT_NONE;
      DBUG_VOID_RETURN;
    }
    strmake(m_message.str, msg.str, msg.length);
    m_message.length= msg.length;
    DBUG_VOID_RETURN;
  }
#endif

#ifdef MYSQL_SERVER
  int pack_info(Protocol*);
#endif

  Incident_log_event(const char *buf, uint event_len,
                     const Format_description_log_event *descr_event);

  virtual ~Incident_log_event();

#ifdef MYSQL_CLIENT
  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif

  virtual bool write_data_header(IO_CACHE *file);
  virtual bool write_data_body(IO_CACHE *file);

  virtual Log_event_type get_type_code() { return INCIDENT_EVENT; }

  virtual bool is_valid() const
  {
    return m_incident > INCIDENT_NONE && m_incident < INCIDENT_COUNT;
  }
  virtual int get_data_size() {
    return INCIDENT_HEADER_LEN + 1 + (uint) m_message.length;
  }

private:
  const char *description() const;

  Incident m_incident;
  LEX_STRING m_message;
};


class Ignorable_log_event : public Log_event {
public:
#ifndef MYSQL_CLIENT
  Ignorable_log_event(THD *thd_arg)
      : Log_event(thd_arg, LOG_EVENT_IGNORABLE_F, 
                  Log_event::EVENT_STMT_CACHE,
                  Log_event::EVENT_NORMAL_LOGGING)
  {
    DBUG_ENTER("Ignorable_log_event::Ignorable_log_event");
    DBUG_VOID_RETURN;
  }
#endif

  Ignorable_log_event(const char *buf,
                      const Format_description_log_event *descr_event);
  virtual ~Ignorable_log_event();

#ifndef MYSQL_CLIENT
  int pack_info(Protocol*);
#endif

#ifdef MYSQL_CLIENT
  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif

  virtual Log_event_type get_type_code() { return IGNORABLE_LOG_EVENT; }

  virtual bool is_valid() const { return 1; }

  virtual int get_data_size() { return IGNORABLE_HEADER_LEN; }
};


class Rows_query_log_event : public Ignorable_log_event {
public:
#ifndef MYSQL_CLIENT
  Rows_query_log_event(THD *thd_arg, const char * query, ulong query_len)
    : Ignorable_log_event(thd_arg)
  {
    DBUG_ENTER("Rows_query_log_event::Rows_query_log_event");
    if (!(m_rows_query= (char*) my_malloc(query_len + 1, MYF(MY_WME))))
      return;
    my_snprintf(m_rows_query, query_len + 1, "%s", query);
    DBUG_PRINT("enter", ("%s", m_rows_query));
    DBUG_VOID_RETURN;
  }
#endif

#ifndef MYSQL_CLIENT
  int pack_info(Protocol*);
#endif

  Rows_query_log_event(const char *buf, uint event_len,
                     const Format_description_log_event *descr_event);

  virtual ~Rows_query_log_event();

#ifdef MYSQL_CLIENT
  virtual void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif
  virtual bool write_data_body(IO_CACHE *file);

  virtual Log_event_type get_type_code() { return ROWS_QUERY_LOG_EVENT; }

  virtual int get_data_size()
  {
    return IGNORABLE_HEADER_LEN + 1 + (uint) strlen(m_rows_query);
  }
#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  virtual int do_apply_event(Relay_log_info const *rli);
#endif

private:

  char * m_rows_query;
};



static inline bool copy_event_cache_to_file_and_reinit(IO_CACHE *cache,
                                                       FILE *file,
                                                       bool flush_stream)
{
  return         
    my_b_copy_to_file(cache, file) ||
    (flush_stream ? (fflush(file) || ferror(file)) : 0) ||
    reinit_io_cache(cache, WRITE_CACHE, 0, FALSE, TRUE);
}

#ifdef MYSQL_SERVER
/*****************************************************************************

  Heartbeat Log Event class

  Replication event to ensure to slave that master is alive.
  The event is originated by master's dump thread and sent straight to
  slave without being logged. Slave itself does not store it in relay log
  but rather uses a data for immediate checks and throws away the event.

  Two members of the class log_ident and Log_event::log_pos comprise 
  @see the event_coordinates instance. The coordinates that a heartbeat
  instance carries correspond to the last event master has sent from
  its binlog.

 ****************************************************************************/
class Heartbeat_log_event: public Log_event
{
public:
  Heartbeat_log_event(const char* buf, uint event_len,
                      const Format_description_log_event* description_event);
  Log_event_type get_type_code() { return HEARTBEAT_LOG_EVENT; }
  bool is_valid() const
    {
      return (log_ident != NULL &&
              log_pos >= BIN_LOG_HEADER_SIZE);
    }
  const char * get_log_ident() { return log_ident; }
  uint get_ident_len() { return ident_len; }
  
private:
  const char* log_ident;
  uint ident_len;
};

bool slave_execute_deferred_events(THD *thd);
#endif

int append_query_string(THD *thd, const CHARSET_INFO *csinfo,
                        String const *from, String *to);
bool event_checksum_test(uchar *buf, ulong event_len, uint8 alg);
uint8 get_checksum_alg(const char* buf, ulong len);
extern TYPELIB binlog_checksum_typelib;

class Gtid_log_event : public Log_event
{
public:
#ifndef MYSQL_CLIENT

  Gtid_log_event(THD *thd_arg, bool using_trans,
                 const Gtid_specification *spec= NULL);
#endif

#ifndef MYSQL_CLIENT
  int pack_info(Protocol*);
#endif

  Gtid_log_event(const char *buffer, uint event_len,
                 const Format_description_log_event *descr_event);

  virtual ~Gtid_log_event() {}

  Log_event_type get_type_code()
  {
    DBUG_ENTER("Gtid_log_event::get_type_code()");
    Log_event_type ret= (spec.type == ANONYMOUS_GROUP ?
                         ANONYMOUS_GTID_LOG_EVENT : GTID_LOG_EVENT);
    DBUG_PRINT("info", ("code=%d=%s", ret, get_type_str(ret)));
    DBUG_RETURN(ret);
  }

  int get_data_size() { return POST_HEADER_LENGTH; }

private:
  size_t to_string(char *buf) const;

public:
#ifdef MYSQL_CLIENT
  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif
#ifdef MYSQL_SERVER
  bool write_data_header(IO_CACHE *file);
#endif

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  int do_apply_event(Relay_log_info const *rli);
  int do_update_pos(Relay_log_info *rli);
#endif

  enum_group_type get_type() const { return spec.type; }
  bool is_valid() const { return true; }

  const rpl_sid* get_sid() const { return &sid; }
  rpl_sidno get_sidno(bool need_lock)
  {
    if (spec.gtid.sidno < 0)
    {
      if (need_lock)
        global_sid_lock->rdlock();
      else
        global_sid_lock->assert_some_lock();
      spec.gtid.sidno= global_sid_map->add_sid(sid);
      if (need_lock)
        global_sid_lock->unlock();
    }
    return spec.gtid.sidno;
  }
  rpl_sidno get_sidno(Sid_map *sid_map)
  {
    return sid_map->add_sid(sid);
  }
  rpl_gno get_gno() const { return spec.gtid.gno; }
  bool get_commit_flag() const { return commit_flag; }

  static const char *SET_STRING_PREFIX;
private:
  static const size_t SET_STRING_PREFIX_LENGTH= 26;
  static const size_t MAX_SET_STRING_LENGTH= SET_STRING_PREFIX_LENGTH +
    rpl_sid::TEXT_LENGTH + 1 + MAX_GNO_TEXT_LENGTH + 1;

  static const int ENCODED_FLAG_LENGTH= 1;
  static const int ENCODED_SID_LENGTH= rpl_sid::BYTE_LENGTH;
  static const int ENCODED_GNO_LENGTH= 8;

public:
  static const int POST_HEADER_LENGTH=
    ENCODED_FLAG_LENGTH + ENCODED_SID_LENGTH + ENCODED_GNO_LENGTH;

private:
  Gtid_specification spec;
  rpl_sid sid;
  bool commit_flag;
};


class Previous_gtids_log_event : public Log_event
{
public:
#ifndef MYSQL_CLIENT
  Previous_gtids_log_event(const Gtid_set *set);
#endif

#ifndef MYSQL_CLIENT
  int pack_info(Protocol*);
#endif

  Previous_gtids_log_event(const char *buffer, uint event_len,
                           const Format_description_log_event *descr_event);
  virtual ~Previous_gtids_log_event() {}

  Log_event_type get_type_code() { return PREVIOUS_GTIDS_LOG_EVENT; }

  bool is_valid() const { return buf != NULL; }
  int get_data_size() { return buf_size; }

#ifdef MYSQL_CLIENT
  void print(FILE *file, PRINT_EVENT_INFO *print_event_info);
#endif
#ifdef MYSQL_SERVER
  bool write(IO_CACHE* file)
  {
    if (DBUG_EVALUATE_IF("skip_writing_previous_gtids_log_event", 1, 0))
    {
      DBUG_PRINT("info", ("skip writing Previous_gtids_log_event because of debug option 'skip_writing_previous_gtids_log_event'"));
      return false;
    }

    if (DBUG_EVALUATE_IF("write_partial_previous_gtids_log_event", 1, 0))
    {
      DBUG_PRINT("info", ("writing partial Previous_gtids_log_event because of debug option 'write_partial_previous_gtids_log_event'"));
      return (Log_event::write_header(file, get_data_size()) ||
              Log_event::write_data_header(file));
    }
  
    return (Log_event::write_header(file, get_data_size()) ||
            Log_event::write_data_header(file) ||
            write_data_body(file) ||
            Log_event::write_footer(file));
  }
  bool write_data_body(IO_CACHE *file);
#endif

  const uchar *get_buf() { return buf; }
  char *get_str(size_t *length,
                const Gtid_set::String_format *string_format) const;
  int add_to_set(Gtid_set *gtid_set) const;
  /*
    Previous Gtid Log events should always be skipped
    there is nothing to apply there, whether it is
    relay log's (generated on Slave) or it is binary log's
    (generated on Master, copied to slave as relay log).
    Also, we should not increment slave_skip_counter
    for this event, hence return EVENT_SKIP_IGNORE.
   */
  enum_skip_reason do_shall_skip(Relay_log_info *rli)
  {
    return EVENT_SKIP_IGNORE;
  }

#if defined(MYSQL_SERVER) && defined(HAVE_REPLICATION)
  int do_apply_event(Relay_log_info const *rli) { return 0; }
  int do_update_pos(Relay_log_info *rli);
#endif

private:
  int buf_size;
  const uchar *buf;
};

inline bool is_gtid_event(Log_event* evt)
{
  return (evt->get_type_code() == GTID_LOG_EVENT ||
          evt->get_type_code() == ANONYMOUS_GTID_LOG_EVENT);
}

inline ulong version_product(const uchar* version_split)
{
  return ((version_split[0] * 256 + version_split[1]) * 256
          + version_split[2]);
}

inline void do_server_version_split(char* version, uchar split_versions[3])
{
  char *p= version, *r;
  ulong number;
  for (uint i= 0; i<=2; i++)
  {
    number= strtoul(p, &r, 10);
    /*
      It is an invalid version if any version number greater than 255 or
      first number is not followed by '.'.
    */
    if (number < 256 && (*r == '.' || i != 0))
      split_versions[i]= (uchar)number;
    else
    {
      split_versions[0]= 0;
      split_versions[1]= 0;
      split_versions[2]= 0;
      break;
    }

    p= r;
    if (*r == '.')
      p++; // skip the dot
  }
}

#ifdef MYSQL_SERVER
/*
  This is an utility function that adds a quoted identifier into the a buffer.
  This also escapes any existance of the quote string inside the identifier.
 */
size_t my_strmov_quoted_identifier(THD *thd, char *buffer,
                                   const char* identifier,
                                   uint length);
#else
size_t my_strmov_quoted_identifier(char *buffer, const char* identifier);
#endif
size_t my_strmov_quoted_identifier_helper(int q, char *buffer,
                                          const char* identifier,
                                          uint length);

#endif /* _log_event_h */