text: /* Copyright (c) 2007, 2013, Oracle and/or its affiliates.
  
     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 Street, Fifth Floor, Boston, MA  02110-1301, USA */
  
  #ifndef LOG_EVENT_OLD_H
  #define LOG_EVENT_OLD_H
  
  /*
    Need to include this file at the proper position of log_event.h
   */
  
  
  /**
    @file
  
    @brief This file contains classes handling old formats of row-based
    binlog events.
  */
  /*
    Around 2007-10-31, I made these classes completely separated from
    the new classes (before, there was a complex class hierarchy
    involving multiple inheritance; see BUG#31581), by simply copying
    and pasting the entire contents of Rows_log_event into
    Old_rows_log_event and the entire contents of
    {Write|Update|Delete}_rows_log_event into
    {Write|Update|Delete}_rows_log_event_old.  For clarity, I will keep
    the comments marking which code was cut-and-pasted for some time.
    With the classes collapsed into one, there is probably some
    redundancy (maybe some methods can be simplified and/or removed),
    but we keep them this way for now.  /Sven
  */
  
  /* These classes are based on the v1 RowsHeaderLen */
  #undef ROWS_HEADER_LEN
  #define ROWS_HEADER_LEN ROWS_HEADER_LEN_V1
  
  /**
    @class Old_rows_log_event
    
    Base class for the three types of row-based events
    {Write|Update|Delete}_row_log_event_old, with event type codes
    PRE_GA_{WRITE|UPDATE|DELETE}_ROWS_EVENT.  These events are never
    created any more, except when reading a relay log created by an old
    server.
  */
  class Old_rows_log_event : public Log_event
  {
    /********** BEGIN CUT & PASTE FROM Rows_log_event **********/
  public:
    /**
       Enumeration of the errors that can be returned.
     */
    enum enum_error
    {
      ERR_OPEN_FAILURE = -1,               /**< Failure to open table */
      ERR_OK = 0,                                 /**< No error */
      ERR_TABLE_LIMIT_EXCEEDED = 1,      /**< No more room for tables */
      ERR_OUT_OF_MEM = 2,                         /**< Out of memory */
      ERR_BAD_TABLE_DEF = 3,     /**< Table definition does not match */
      ERR_RBR_TO_SBR = 4  /**< daisy-chanining RBR to SBR not allowed */
    };
  
    /*
      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),
  
      /** 
        Indicates that rows in this event are complete, that is contain
        values for all columns of the table.
       */
      COMPLETE_ROWS_F = (1U << 3)
    };
  
    typedef uint16 flag_set;
  
    /* Special constants representing sets of flags */
    enum 
    {
        RLE_NO_FLAGS = 0U
    };
  
    virtual ~Old_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; }
  
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
    virtual void pack_info(Protocol *protocol);
  #endif
  
  #ifdef MYSQL_CLIENT
    /* not for direct call, each derived has its own ::print() */
    virtual bool print(FILE *file, PRINT_EVENT_INFO *print_event_info)= 0;
  #endif
  
  #ifndef MYSQL_CLIENT
    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; }
    size_t get_width() const          { return m_width; }
    ulong get_table_id() const        { return m_table_id; }
  
  #ifndef MYSQL_CLIENT
    virtual bool write_data_header();
    virtual bool write_data_body();
    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_old
      is valid is done in the Update_rows_log_event_old::is_valid()
      function.
    */
    virtual bool is_valid() const
    {
      return m_rows_buf && m_cols.bitmap;
    }
    bool is_part_of_group() { return 1; }
  
    uint     m_row_count;         /* The number of rows added to the event */
  
  protected:
    /* 
       The constructors are protected since you're supposed to inherit
       this class, not create instances of this class.
    */
  #ifndef MYSQL_CLIENT
    Old_rows_log_event(THD*, TABLE*, ulong table_id,
                       MY_BITMAP const *cols, bool is_transactional);
  #endif
    Old_rows_log_event(const char *row_data, uint event_len,
                       Log_event_type event_type,
                       const Format_description_log_event *description_event);
  
  #ifdef MYSQL_CLIENT
    bool print_helper(FILE *, PRINT_EVENT_INFO *, char const *const name);
  #endif
  
  #ifndef MYSQL_CLIENT
    virtual int do_add_row_data(uchar *data, size_t length);
  #endif
  
  #ifndef MYSQL_CLIENT
    TABLE *m_table;		/* The table the rows belong to */
  #endif
    ulong       m_table_id;	/* Table ID */
    MY_BITMAP   m_cols;		/* Bitmap denoting columns available */
    ulong       m_width;          /* The width of the columns bitmap */
  
    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 */
  
    /* helper functions */
  
  #if !defined(MYSQL_CLIENT) && 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 */
  
    int find_row(rpl_group_info *);
    int write_row(rpl_group_info *, const bool);
  
    // Unpack the current row into m_table->record[0]
    int unpack_current_row(rpl_group_info *rgi)
    { 
      DBUG_ASSERT(m_table);
      ASSERT_OR_RETURN_ERROR(m_curr_row < m_rows_end, HA_ERR_CORRUPT_EVENT);
      return ::unpack_row(rgi, m_table, m_width, m_curr_row, &m_cols,
                                     &m_curr_row_end, &m_master_reclength, m_rows_end);
    }
  #endif
  
  private:
  
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
    virtual int do_apply_event(rpl_group_info *rgi);
    virtual int do_update_pos(rpl_group_info *rgi);
    virtual enum_skip_reason do_shall_skip(rpl_group_info *rgi);
  
    /*
      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(rpl_group_info *rgi) = 0;
  #endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
  
    /********** END OF CUT & PASTE FROM Rows_log_event **********/
   protected:
    
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
  
    int do_apply_event(Old_rows_log_event*, rpl_group_info *rgi);
  
    /*
      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(TABLE *table) = 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.
    */
    virtual int do_after_row_operations(TABLE *table, int error) = 0;
  
    /*
      Primitive to prepare for handling one row in a row-level event.
      
      DESCRIPTION 
  
        The member function prepares for execution of operations needed for one
        row in a row-level event by reading up data from the buffer containing
        the row. No specific interpretation of the data is normally done here,
        since SQL thread specific data is not available: that data is made
        available for the do_exec function.
  
        A pointer to the start of the next row, or NULL if the preparation
        failed. Currently, preparation cannot fail, but don't rely on this
        behavior. 
  
      RETURN VALUE
        Error code, if something went wrong, 0 otherwise.
     */
    virtual int do_prepare_row(THD*, rpl_group_info*, TABLE*,
                               uchar const *row_start,
                               uchar const **row_end) = 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.
  
      RETURN VALUE
        0 if execution succeeded, 1 if execution failed.
        
    */
    virtual int do_exec_row(TABLE *table) = 0;
  
  #endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
  };
  
  
  /**
    @class Write_rows_log_event_old
  
    Old class for binlog events that write new rows to a table (event
    type code PRE_GA_WRITE_ROWS_EVENT).  Such events are never produced
    by this version of the server, but they may be read from a relay log
    created by an old server.  New servers create events of class
    Write_rows_log_event (event type code WRITE_ROWS_EVENT) instead.
  */
  class Write_rows_log_event_old : public Old_rows_log_event
  {
    /********** BEGIN CUT & PASTE FROM Write_rows_log_event **********/
  public:
  #if !defined(MYSQL_CLIENT)
    Write_rows_log_event_old(THD*, TABLE*, ulong table_id,
                             MY_BITMAP const *cols, bool is_transactional);
  #endif
  #ifdef HAVE_REPLICATION
    Write_rows_log_event_old(const char *buf, uint event_len,
                             const Format_description_log_event *description_event);
  #endif
  #if !defined(MYSQL_CLIENT) 
    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);
    }
  #endif
  
  private:
  #ifdef MYSQL_CLIENT
    bool print(FILE *file, PRINT_EVENT_INFO *print_event_info);
  #endif
  
  #if !defined(MYSQL_CLIENT) && 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(rpl_group_info *);
  #endif
    /********** END OF CUT & PASTE FROM Write_rows_log_event **********/
  
  public:
    enum
    {
      /* Support interface to THD::binlog_prepare_pending_rows_event */
      TYPE_CODE = PRE_GA_WRITE_ROWS_EVENT
    };
  
  private:
    virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
  
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
    // use old definition of do_apply_event()
    virtual int do_apply_event(rpl_group_info *rgi)
    { return Old_rows_log_event::do_apply_event(this, rgi); }
  
    // primitives for old version of do_apply_event()
    virtual int do_before_row_operations(TABLE *table);
    virtual int do_after_row_operations(TABLE *table, int error);
    virtual int do_prepare_row(THD*, rpl_group_info*, TABLE*,
                               uchar const *row_start, uchar const **row_end);
    virtual int do_exec_row(TABLE *table);
  
  #endif
  };
  
  
  /**
    @class Update_rows_log_event_old
  
    Old class for binlog events that modify existing rows to a table
    (event type code PRE_GA_UPDATE_ROWS_EVENT).  Such events are never
    produced by this version of the server, but they may be read from a
    relay log created by an old server.  New servers create events of
    class Update_rows_log_event (event type code UPDATE_ROWS_EVENT)
    instead.
  */
  class Update_rows_log_event_old : public Old_rows_log_event
  {
    /********** BEGIN CUT & PASTE FROM Update_rows_log_event **********/
  public:
  #ifndef MYSQL_CLIENT
    Update_rows_log_event_old(THD*, TABLE*, ulong table_id,
                              MY_BITMAP const *cols,
                              bool is_transactional);
  #endif
  
  #ifdef HAVE_REPLICATION
    Update_rows_log_event_old(const char *buf, uint event_len,
                              const Format_description_log_event *description_event);
  #endif
  
  #if !defined(MYSQL_CLIENT) 
    static bool binlog_row_logging_function(THD *thd, TABLE *table,
                                            bool is_transactional,
                                            MY_BITMAP *cols,
                                            uint fields,
                                            const uchar *before_record,
                                            const uchar *after_record)
    {
      return thd->binlog_update_row(table, is_transactional,
                                    before_record, after_record);
    }
  #endif
  
  protected:
  #ifdef MYSQL_CLIENT
    bool print(FILE *file, PRINT_EVENT_INFO *print_event_info);
  #endif
  
  #if !defined(MYSQL_CLIENT) && 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(rpl_group_info *);
  #endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
    /********** END OF CUT & PASTE FROM Update_rows_log_event **********/
  
    uchar *m_after_image, *m_memory;
    
  public:
    enum 
    {
      /* Support interface to THD::binlog_prepare_pending_rows_event */
      TYPE_CODE = PRE_GA_UPDATE_ROWS_EVENT
    };
  
  private:
    virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
  
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
    // use old definition of do_apply_event()
    virtual int do_apply_event(rpl_group_info *rgi)
    { return Old_rows_log_event::do_apply_event(this, rgi); }
  
    // primitives for old version of do_apply_event()
    virtual int do_before_row_operations(TABLE *table);
    virtual int do_after_row_operations(TABLE *table, int error);
    virtual int do_prepare_row(THD*, rpl_group_info*, TABLE*,
                               uchar const *row_start, uchar const **row_end);
    virtual int do_exec_row(TABLE *table);
  #endif /* !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION) */
  };
  
  
  /**
    @class Delete_rows_log_event_old
  
    Old class for binlog events that delete existing rows from a table
    (event type code PRE_GA_DELETE_ROWS_EVENT).  Such events are never
    produced by this version of the server, but they may be read from a
    relay log created by an old server.  New servers create events of
    class Delete_rows_log_event (event type code DELETE_ROWS_EVENT)
    instead.
  */
  class Delete_rows_log_event_old : public Old_rows_log_event
  {
    /********** BEGIN CUT & PASTE FROM Update_rows_log_event **********/
  public:
  #ifndef MYSQL_CLIENT
    Delete_rows_log_event_old(THD*, TABLE*, ulong,
                              MY_BITMAP const *cols, bool is_transactional);
  #endif
  #ifdef HAVE_REPLICATION
    Delete_rows_log_event_old(const char *buf, uint event_len,
                              const Format_description_log_event *description_event);
  #endif
  #if !defined(MYSQL_CLIENT) 
    static bool binlog_row_logging_function(THD *thd, TABLE *table,
                                            bool is_transactional,
                                            MY_BITMAP *cols,
                                            uint fields,
                                            const uchar *before_record,
                                            const uchar *after_record
                                            __attribute__((unused)))
    {
      return thd->binlog_delete_row(table, is_transactional, before_record);
    }
  #endif
    
  protected:
  #ifdef MYSQL_CLIENT
    bool print(FILE *file, PRINT_EVENT_INFO *print_event_info);
  #endif
  
  #if !defined(MYSQL_CLIENT) && 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(rpl_group_info *);
  #endif
    /********** END CUT & PASTE FROM Delete_rows_log_event **********/
  
    uchar *m_after_image, *m_memory;
   
  public:
    enum 
    {
      /* Support interface to THD::binlog_prepare_pending_rows_event */
      TYPE_CODE = PRE_GA_DELETE_ROWS_EVENT
    };
  
  private:
    virtual Log_event_type get_type_code() { return (Log_event_type)TYPE_CODE; }
  
  #if !defined(MYSQL_CLIENT) && defined(HAVE_REPLICATION)
    // use old definition of do_apply_event()
    virtual int do_apply_event(rpl_group_info *rgi)
    { return Old_rows_log_event::do_apply_event(this, rgi); }
  
    // primitives for old version of do_apply_event()
    virtual int do_before_row_operations(TABLE *table);
    virtual int do_after_row_operations(TABLE *table, int error);
    virtual int do_prepare_row(THD*, rpl_group_info*, TABLE*,
                               uchar const *row_start, uchar const **row_end);
    virtual int do_exec_row(TABLE *table);
  #endif
  };
  
  
  #endif
  