/* Copyright (C) 2000-2004 MySQL AB
   
   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; either version 2 of the License, or
   (at your option) any later version.
   
   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


#ifndef MYSQL_CLIENT

#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation				// gcc: Class implementation
#endif

#include  "mysql_priv.h"
#include "slave.h"
#include <my_dir.h>
#endif /* MYSQL_CLIENT */

#define log_cs	&my_charset_latin1

/*
  pretty_print_str()
*/

#ifdef MYSQL_CLIENT
static void pretty_print_str(FILE* file, char* str, int len)
{
  char* end = str + len;
  fputc('\'', file);
  while (str < end)
  {
    char c;
    switch ((c=*str++)) {
    case '\n': fprintf(file, "\\n"); break;
    case '\r': fprintf(file, "\\r"); break;
    case '\\': fprintf(file, "\\\\"); break;
    case '\b': fprintf(file, "\\b"); break;
    case '\t': fprintf(file, "\\t"); break;
    case '\'': fprintf(file, "\\'"); break;
    case 0   : fprintf(file, "\\0"); break;
    default:
      fputc(c, file);
      break;
    }
  }
  fputc('\'', file);
}
#endif /* MYSQL_CLIENT */


#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)

static void clear_all_errors(THD *thd, struct st_relay_log_info *rli)
{
  thd->query_error = 0;
  thd->clear_error();
  *rli->last_slave_error = 0;
  rli->last_slave_errno = 0;
}


/*
  Ignore error code specified on command line
*/

inline int ignored_error_code(int err_code)
{
  return ((err_code == ER_SLAVE_IGNORED_TABLE) ||
          (use_slave_mask && bitmap_is_set(&slave_error_mask, err_code)));
}
#endif


/*
  pretty_print_str()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
static char *pretty_print_str(char *packet, char *str, int len)
{
  char *end= str + len;
  char *pos= packet;
  *pos++= '\'';
  while (str < end)
  {
    char c;
    switch ((c=*str++)) {
    case '\n': *pos++= '\\'; *pos++= 'n'; break;
    case '\r': *pos++= '\\'; *pos++= 'r'; break;
    case '\\': *pos++= '\\'; *pos++= '\\'; break;
    case '\b': *pos++= '\\'; *pos++= 'b'; break;
    case '\t': *pos++= '\\'; *pos++= 't'; break;
    case '\'': *pos++= '\\'; *pos++= '\''; break;
    case 0   : *pos++= '\\'; *pos++= '0'; break;
    default:
      *pos++= c;
      break;
    }
  }
  *pos++= '\'';
  return pos;
}
#endif /* !MYSQL_CLIENT */


/*
  slave_load_file_stem()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
static inline char* slave_load_file_stem(char*buf, uint file_id,
					 int event_server_id)
{
  fn_format(buf,"SQL_LOAD-",slave_load_tmpdir, "", MY_UNPACK_FILENAME);
  buf = strend(buf);
  buf = int10_to_str(::server_id, buf, 10);
  *buf++ = '-';
  buf = int10_to_str(event_server_id, buf, 10);
  *buf++ = '-';
  return int10_to_str(file_id, buf, 10);
}
#endif


/*
  Delete all temporary files used for SQL_LOAD.

  SYNOPSIS
    cleanup_load_tmpdir()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
static void cleanup_load_tmpdir()
{
  MY_DIR *dirp;
  FILEINFO *file;
  uint i;
  char fname[FN_REFLEN], prefbuf[31], *p;

  if (!(dirp=my_dir(slave_load_tmpdir,MYF(MY_WME))))
    return;

  /* 
     When we are deleting temporary files, we should only remove
     the files associated with the server id of our server.
     We don't use event_server_id here because since we've disabled
     direct binlogging of Create_file/Append_file/Exec_load events
     we cannot meet Start_log event in the middle of events from one 
     LOAD DATA.
  */
  p= strmake(prefbuf,"SQL_LOAD-",9);
  p= int10_to_str(::server_id, p, 10);
  *(p++)= '-';
  *p= 0;

  for (i=0 ; i < (uint)dirp->number_off_files; i++)
  {
    file=dirp->dir_entry+i;
    if (is_prefix(file->name, prefbuf))
    {
      fn_format(fname,file->name,slave_load_tmpdir,"",MY_UNPACK_FILENAME);
      my_delete(fname, MYF(0));
    }
  }

  my_dirend(dirp);
}
#endif


/*
  write_str()
*/

static bool write_str(IO_CACHE *file, char *str, byte length)
{
  return (my_b_safe_write(file, &length, 1) ||
	  my_b_safe_write(file, (byte*) str, (int) length));
}


/*
  read_str()
*/

static inline int read_str(char * &buf, char *buf_end, char * &str,
			   uint8 &len)
{
  if (buf + (uint) (uchar) *buf >= buf_end)
    return 1;
  len = (uint8) *buf;
  str= buf+1;
  buf+= (uint) len+1;
  return 0;
}

/*
  Transforms a string into "" or its expression in 0x... form.
*/
char *str_to_hex(char *to, const char *from, uint len)
{
  char *p= to;
  if (len)
  {
    p= strmov(p, "0x");
    for (uint i= 0; i < len; i++, p+= 2)
    {
      /* val[i] is char. Casting to uchar helps greatly if val[i] < 0 */
      uint tmp= (uint) (uchar) from[i];
      p[0]= _dig_vec_upper[tmp >> 4];
      p[1]= _dig_vec_upper[tmp & 15];
    }
    *p= 0;
  }
  else
    p= strmov(p, "\"\"");
  return p; // pointer to end 0 of 'to'
}


/**************************************************************************
	Log_event methods
**************************************************************************/

/*
  Log_event::get_type_str()
*/

const char* Log_event::get_type_str()
{
  switch(get_type_code()) {
  case START_EVENT:  return "Start";
  case STOP_EVENT:   return "Stop";
  case QUERY_EVENT:  return "Query";
  case ROTATE_EVENT: return "Rotate";
  case INTVAR_EVENT: return "Intvar";
  case LOAD_EVENT:   return "Load";
  case NEW_LOAD_EVENT:   return "New_load";
  case SLAVE_EVENT:  return "Slave";
  case CREATE_FILE_EVENT: return "Create_file";
  case APPEND_BLOCK_EVENT: return "Append_block";
  case DELETE_FILE_EVENT: return "Delete_file";
  case EXEC_LOAD_EVENT: return "Exec_load";
  case RAND_EVENT: return "RAND";
  case USER_VAR_EVENT: return "User var";
  default: return "Unknown";				/* impossible */ 
  }
}


/*
  Log_event::Log_event()
*/

#ifndef MYSQL_CLIENT
Log_event::Log_event(THD* thd_arg, uint16 flags_arg, bool using_trans)
  :log_pos(0), temp_buf(0), exec_time(0), cached_event_len(0),
   flags(flags_arg), thd(thd_arg)
{
  server_id=	thd->server_id;
  when=		thd->start_time;
  cache_stmt=	(using_trans &&
		 (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)));
}


/*
  This minimal constructor is for when you are not even sure that there is a
  valid THD. For example in the server when we are shutting down or flushing
  logs after receiving a SIGHUP (then we must write a Rotate to the binlog but
  we have no THD, so we need this minimal constructor).
*/

Log_event::Log_event()
  :temp_buf(0), exec_time(0), cached_event_len(0), flags(0), cache_stmt(0),
   thd(0)
{
  server_id=	::server_id;
  when=		time(NULL);
  log_pos=	0;
}
#endif /* !MYSQL_CLIENT */


/*
  Log_event::Log_event()
*/

Log_event::Log_event(const char* buf, bool old_format)
  :temp_buf(0), cached_event_len(0), cache_stmt(0)
{
  when = uint4korr(buf);
  server_id = uint4korr(buf + SERVER_ID_OFFSET);
  if (old_format)
  {
    log_pos=0;
    flags=0;
  }
  else
  {
    log_pos = uint4korr(buf + LOG_POS_OFFSET);
    flags = uint2korr(buf + FLAGS_OFFSET);
  }
#ifndef MYSQL_CLIENT
  thd = 0;
#endif  
}

#ifndef MYSQL_CLIENT
#ifdef HAVE_REPLICATION

/*
  Log_event::exec_event()
*/

int Log_event::exec_event(struct st_relay_log_info* rli)
{
  DBUG_ENTER("Log_event::exec_event");

  /*
    rli is null when (as far as I (Guilhem) know)
    the caller is
    Load_log_event::exec_event *and* that one is called from
    Execute_load_log_event::exec_event. 
    In this case, we don't do anything here ;
    Execute_load_log_event::exec_event will call Log_event::exec_event
    again later with the proper rli.
    Strictly speaking, if we were sure that rli is null
    only in the case discussed above, 'if (rli)' is useless here.
    But as we are not 100% sure, keep it for now.
  */
  if (rli)  
  {
    /*
      If in a transaction, and if the slave supports transactions,
      just inc_event_relay_log_pos(). We only have to check for OPTION_BEGIN
      (not OPTION_NOT_AUTOCOMMIT) as transactions are logged
      with BEGIN/COMMIT, not with SET AUTOCOMMIT= .
      
      CAUTION: opt_using_transactions means
      innodb || bdb ; suppose the master supports InnoDB and BDB, 
      but the slave supports only BDB, problems
      will arise: 
      - suppose an InnoDB table is created on the master,
      - then it will be MyISAM on the slave
      - but as opt_using_transactions is true, the slave will believe he is
      transactional with the MyISAM table. And problems will come when one
      does START SLAVE; STOP SLAVE; START SLAVE; (the slave will resume at
      BEGIN whereas there has not been any rollback). This is the problem of
      using opt_using_transactions instead of a finer
      "does the slave support _the_transactional_handler_used_on_the_master_".
      
      More generally, we'll have problems when a query mixes a transactional
      handler and MyISAM and STOP SLAVE is issued in the middle of the
      "transaction". START SLAVE will resume at BEGIN while the MyISAM table
      has already been updated.
    */
    if ((thd->options & OPTION_BEGIN) && opt_using_transactions)
      rli->inc_event_relay_log_pos(get_event_len());
    else
    {
      rli->inc_group_relay_log_pos(get_event_len(),log_pos);
      flush_relay_log_info(rli);
      /* 
         Note that Rotate_log_event::exec_event() does not call this function,
         so there is no chance that a fake rotate event resets
         last_master_timestamp.
         Note that we update without mutex (probably ok - except in some very
         rare cases, only consequence is that value may take some time to
         display in Seconds_Behind_Master - not critical).
      */
      rli->last_master_timestamp= when;
    }
  }
  DBUG_RETURN(0);
}


/*
  Log_event::pack_info()
*/

void Log_event::pack_info(Protocol *protocol)
{
  protocol->store("", &my_charset_bin);
}


/*
  Log_event::net_send()

  Only called by SHOW BINLOG EVENTS
*/

int Log_event::net_send(Protocol *protocol, const char* log_name, my_off_t pos)
{
  const char *p= strrchr(log_name, FN_LIBCHAR);
  const char *event_type;
  if (p)
    log_name = p + 1;
  
  protocol->prepare_for_resend();
  protocol->store(log_name, &my_charset_bin);
  protocol->store((ulonglong) pos);
  event_type = get_type_str();
  protocol->store(event_type, strlen(event_type), &my_charset_bin);
  protocol->store((uint32) server_id);
  protocol->store((ulonglong) log_pos);
  pack_info(protocol);
  return protocol->write();
}
#endif /* HAVE_REPLICATION */


/*
  Log_event::init_show_field_list()
*/

void Log_event::init_show_field_list(List<Item>* field_list)
{
  field_list->push_back(new Item_empty_string("Log_name", 20));
  field_list->push_back(new Item_return_int("Pos", 11,
					    MYSQL_TYPE_LONGLONG));
  field_list->push_back(new Item_empty_string("Event_type", 20));
  field_list->push_back(new Item_return_int("Server_id", 10,
					    MYSQL_TYPE_LONG));
  field_list->push_back(new Item_return_int("Orig_log_pos", 11,
					    MYSQL_TYPE_LONGLONG));
  field_list->push_back(new Item_empty_string("Info", 20));
}

#endif /* !MYSQL_CLIENT */

/*
  Log_event::write()
*/

int Log_event::write(IO_CACHE* file)
{
  return (write_header(file) || write_data(file)) ? -1 : 0;
}


/*
  Log_event::write_header()
*/

int Log_event::write_header(IO_CACHE* file)
{
  char buf[LOG_EVENT_HEADER_LEN];
  char* pos = buf;
  int4store(pos, (ulong) when); // timestamp
  pos += 4;
  *pos++ = get_type_code(); // event type code
  int4store(pos, server_id);
  pos += 4;
  long tmp=get_data_size() + LOG_EVENT_HEADER_LEN;
  int4store(pos, tmp);
  pos += 4;
  int4store(pos, log_pos);
  pos += 4;
  int2store(pos, flags);
  pos += 2;
  return (my_b_safe_write(file, (byte*) buf, (uint) (pos - buf)));
}


/*
  Log_event::read_log_event()
*/

#ifndef MYSQL_CLIENT
int Log_event::read_log_event(IO_CACHE* file, String* packet,
			      pthread_mutex_t* log_lock)
{
  ulong data_len;
  int result=0;
  char buf[LOG_EVENT_HEADER_LEN];
  DBUG_ENTER("read_log_event");

  if (log_lock)
    pthread_mutex_lock(log_lock);
  if (my_b_read(file, (byte*) buf, sizeof(buf)))
  {
    /*
      If the read hits eof, we must report it as eof so the caller
      will know it can go into cond_wait to be woken up on the next
      update to the log.
    */
    DBUG_PRINT("error",("file->error: %d", file->error));
    if (!file->error)
      result= LOG_READ_EOF;
    else
      result= (file->error > 0 ? LOG_READ_TRUNC : LOG_READ_IO);
    goto end;
  }
  data_len= uint4korr(buf + EVENT_LEN_OFFSET);
  if (data_len < LOG_EVENT_HEADER_LEN ||
      data_len > current_thd->variables.max_allowed_packet)
  {
    DBUG_PRINT("error",("data_len: %ld", data_len));
    result= ((data_len < LOG_EVENT_HEADER_LEN) ? LOG_READ_BOGUS :
	     LOG_READ_TOO_LARGE);
    goto end;
  }
  packet->append(buf, sizeof(buf));
  data_len-= LOG_EVENT_HEADER_LEN;
  if (data_len)
  {
    if (packet->append(file, data_len))
    {
      /*
	Here we should never hit EOF in a non-error condition.
	EOF means we are reading the event partially, which should
	never happen.
      */
      result= file->error >= 0 ? LOG_READ_TRUNC: LOG_READ_IO;
      /* Implicit goto end; */
    }
  }

end:
  if (log_lock)
    pthread_mutex_unlock(log_lock);
  DBUG_RETURN(result);
}
#endif /* !MYSQL_CLIENT */

#ifndef MYSQL_CLIENT
#define UNLOCK_MUTEX if (log_lock) pthread_mutex_unlock(log_lock);
#define LOCK_MUTEX if (log_lock) pthread_mutex_lock(log_lock);
#define max_allowed_packet current_thd->variables.max_allowed_packet
#else
#define UNLOCK_MUTEX
#define LOCK_MUTEX
#define max_allowed_packet (*mysql_get_parameters()->p_max_allowed_packet)
#endif

/*
  Log_event::read_log_event()

  NOTE:
    Allocates memory;  The caller is responsible for clean-up
*/

#ifndef MYSQL_CLIENT
Log_event* Log_event::read_log_event(IO_CACHE* file,
				     pthread_mutex_t* log_lock,
				     bool old_format)
#else
Log_event* Log_event::read_log_event(IO_CACHE* file, bool old_format)
#endif  
{
  char head[LOG_EVENT_HEADER_LEN];
  uint header_size= old_format ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;

  LOCK_MUTEX;
  if (my_b_read(file, (byte *) head, header_size))
  {
    UNLOCK_MUTEX;
    return 0;
  }

  uint data_len = uint4korr(head + EVENT_LEN_OFFSET);
  char *buf= 0;
  const char *error= 0;
  Log_event *res=  0;

  if (data_len > max_allowed_packet)
  {
    error = "Event too big";
    goto err;
  }

  if (data_len < header_size)
  {
    error = "Event too small";
    goto err;
  }

  // some events use the extra byte to null-terminate strings
  if (!(buf = my_malloc(data_len+1, MYF(MY_WME))))
  {
    error = "Out of memory";
    goto err;
  }
  buf[data_len] = 0;
  memcpy(buf, head, header_size);
  if (my_b_read(file, (byte*) buf + header_size, data_len - header_size))
  {
    error = "read error";
    goto err;
  }
  if ((res = read_log_event(buf, data_len, &error, old_format)))
    res->register_temp_buf(buf);

err:
  UNLOCK_MUTEX;
  if (error)
  {
    sql_print_error("\
Error in Log_event::read_log_event(): '%s', data_len: %d, event_type: %d",
		    error,data_len,head[EVENT_TYPE_OFFSET]);
    my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
    /*
      The SQL slave thread will check if file->error<0 to know
      if there was an I/O error. Even if there is no "low-level" I/O errors
      with 'file', any of the high-level above errors is worrying
      enough to stop the SQL thread now ; as we are skipping the current event,
      going on with reading and successfully executing other events can
      only corrupt the slave's databases. So stop.
    */
    file->error= -1;
  }
  return res;
}


/*
  Log_event::read_log_event()
*/

Log_event* Log_event::read_log_event(const char* buf, int event_len,
				     const char **error, bool old_format)
{
  DBUG_ENTER("Log_event::read_log_event");

  if (event_len < EVENT_LEN_OFFSET ||
      (uint) event_len != uint4korr(buf+EVENT_LEN_OFFSET))
  {
    *error="Sanity check failed";		// Needed to free buffer
    DBUG_RETURN(NULL); // general sanity check - will fail on a partial read
  }
  
  Log_event* ev = NULL;
  
  switch(buf[EVENT_TYPE_OFFSET]) {
  case QUERY_EVENT:
    ev  = new Query_log_event(buf, event_len, old_format);
    break;
  case LOAD_EVENT:
    ev = new Create_file_log_event(buf, event_len, old_format);
    break;
  case NEW_LOAD_EVENT:
    ev = new Load_log_event(buf, event_len, old_format);
    break;
  case ROTATE_EVENT:
    ev = new Rotate_log_event(buf, event_len, old_format);
    break;
#ifdef HAVE_REPLICATION
  case SLAVE_EVENT:
    ev = new Slave_log_event(buf, event_len);
    break;
#endif /* HAVE_REPLICATION */
  case CREATE_FILE_EVENT:
    ev = new Create_file_log_event(buf, event_len, old_format);
    break;
  case APPEND_BLOCK_EVENT:
    ev = new Append_block_log_event(buf, event_len);
    break;
  case DELETE_FILE_EVENT:
    ev = new Delete_file_log_event(buf, event_len);
    break;
  case EXEC_LOAD_EVENT:
    ev = new Execute_load_log_event(buf, event_len);
    break;
  case START_EVENT:
    ev = new Start_log_event(buf, old_format);
    break;
#ifdef HAVE_REPLICATION
  case STOP_EVENT:
    ev = new Stop_log_event(buf, old_format);
    break;
#endif /* HAVE_REPLICATION */
  case INTVAR_EVENT:
    ev = new Intvar_log_event(buf, old_format);
    break;
  case RAND_EVENT:
    ev = new Rand_log_event(buf, old_format);
    break;
  case USER_VAR_EVENT:
    ev = new User_var_log_event(buf, old_format);
    break;
  default:
    break;
  }
  if (!ev || !ev->is_valid())
  {
    delete ev;
#ifdef MYSQL_CLIENT
    if (!force_opt)
    {
      *error= "Found invalid event in binary log";
      DBUG_RETURN(0);
    }
    ev= new Unknown_log_event(buf, old_format);
#else
    *error= "Found invalid event in binary log";
    DBUG_RETURN(0);
#endif
  }
  ev->cached_event_len = event_len;
  DBUG_RETURN(ev);  
}

#ifdef MYSQL_CLIENT

/*
  Log_event::print_header()
*/

void Log_event::print_header(FILE* file)
{
  char llbuff[22];
  fputc('#', file);
  print_timestamp(file);
  fprintf(file, " server id %d  log_pos %s ", server_id,
	  llstr(log_pos,llbuff)); 
}

/*
  Log_event::print_timestamp()
*/

void Log_event::print_timestamp(FILE* file, time_t* ts)
{
  struct tm *res;
  if (!ts)
    ts = &when;
#ifdef MYSQL_SERVER				// This is always false
  struct tm tm_tmp;
  localtime_r(ts,(res= &tm_tmp));
#else
  res=localtime(ts);
#endif

  fprintf(file,"%02d%02d%02d %2d:%02d:%02d",
	  res->tm_year % 100,
	  res->tm_mon+1,
	  res->tm_mday,
	  res->tm_hour,
	  res->tm_min,
	  res->tm_sec);
}

#endif /* MYSQL_CLIENT */


/*
  Log_event::set_log_pos()
*/

#ifndef MYSQL_CLIENT
void Log_event::set_log_pos(MYSQL_LOG* log)
{
  if (!log_pos)
    log_pos = my_b_tell(&log->log_file);
}
#endif /* !MYSQL_CLIENT */


/**************************************************************************
	Query_log_event methods
**************************************************************************/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)

/*
  Query_log_event::pack_info()
*/

void Query_log_event::pack_info(Protocol *protocol)
{
  char *buf, *pos;
  if (!(buf= my_malloc(9 + db_len + q_len, MYF(MY_WME))))
    return;
  pos= buf;    
  if (!(flags & LOG_EVENT_SUPPRESS_USE_F) 
      && db && db_len)
  {
    pos= strmov(buf, "use `");
    memcpy(pos, db, db_len);
    pos= strmov(pos+db_len, "`; ");
  }
  if (query && q_len)
  {
    memcpy(pos, query, q_len);
    pos+= q_len;
  }
  protocol->store(buf, pos-buf, &my_charset_bin);
  my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
}
#endif


/*
  Query_log_event::write()
*/

int Query_log_event::write(IO_CACHE* file)
{
  return query ? Log_event::write(file) : -1; 
}


/*
  Query_log_event::write_data()
*/

int Query_log_event::write_data(IO_CACHE* file)
{
  char buf[QUERY_HEADER_LEN]; 

  if (!query)
    return -1;
  
  /*
    We want to store the thread id:
    (- as an information for the user when he reads the binlog)
    - if the query uses temporary table: for the slave SQL thread to know to
    which master connection the temp table belongs.
    Now imagine we (write_data()) are called by the slave SQL thread (we are
    logging a query executed by this thread; the slave runs with
    --log-slave-updates). Then this query will be logged with
    thread_id=the_thread_id_of_the_SQL_thread. Imagine that 2 temp tables of
    the same name were created simultaneously on the master (in the master
    binlog you have
    CREATE TEMPORARY TABLE t; (thread 1)
    CREATE TEMPORARY TABLE t; (thread 2)
    ...)
    then in the slave's binlog there will be
    CREATE TEMPORARY TABLE t; (thread_id_of_the_slave_SQL_thread)
    CREATE TEMPORARY TABLE t; (thread_id_of_the_slave_SQL_thread)
    which is bad (same thread id!).

    To avoid this, we log the thread's thread id EXCEPT for the SQL
    slave thread for which we log the original (master's) thread id.
    Now this moves the bug: what happens if the thread id on the
    master was 10 and when the slave replicates the query, a
    connection number 10 is opened by a normal client on the slave,
    and updates a temp table of the same name? We get a problem
    again. To avoid this, in the handling of temp tables (sql_base.cc)
    we use thread_id AND server_id.  TODO when this is merged into
    4.1: in 4.1, slave_proxy_id has been renamed to pseudo_thread_id
    and is a session variable: that's to make mysqlbinlog work with
    temp tables. We probably need to introduce

    SET PSEUDO_SERVER_ID
    for mysqlbinlog in 4.1. mysqlbinlog would print:
    SET PSEUDO_SERVER_ID=
    SET PSEUDO_THREAD_ID=
    for each query using temp tables.
  */
  int4store(buf + Q_THREAD_ID_OFFSET, slave_proxy_id);
  int4store(buf + Q_EXEC_TIME_OFFSET, exec_time);
  buf[Q_DB_LEN_OFFSET] = (char) db_len;
  int2store(buf + Q_ERR_CODE_OFFSET, error_code);

  return (my_b_safe_write(file, (byte*) buf, QUERY_HEADER_LEN) ||
	  my_b_safe_write(file, (db) ? (byte*) db : (byte*)"", db_len + 1) ||
	  my_b_safe_write(file, (byte*) query, q_len)) ? -1 : 0;
}


/*
  Query_log_event::Query_log_event()
*/

#ifndef MYSQL_CLIENT
Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
				 ulong query_length, bool using_trans,
				 bool suppress_use)
  :Log_event(thd_arg, 
	     ((thd_arg->tmp_table_used ? LOG_EVENT_THREAD_SPECIFIC_F : 0)
	      | (suppress_use          ? LOG_EVENT_SUPPRESS_USE_F    : 0)),
	     using_trans),
   data_buf(0), query(query_arg),
   db(thd_arg->db), q_len((uint32) query_length),
   error_code(thd_arg->killed ?
              ((thd_arg->system_thread & SYSTEM_THREAD_DELAYED_INSERT) ?
               0 : ER_SERVER_SHUTDOWN) : thd_arg->net.last_errno),
   thread_id(thd_arg->thread_id),
   /* save the original thread id; we already know the server id */
   slave_proxy_id(thd_arg->variables.pseudo_thread_id)
{
  time_t end_time;
  time(&end_time);
  exec_time = (ulong) (end_time  - thd->start_time);
  db_len = (db) ? (uint32) strlen(db) : 0;
}
#endif /* MYSQL_CLIENT */


/*
  Query_log_event::Query_log_event()
*/

Query_log_event::Query_log_event(const char* buf, int event_len,
				 bool old_format)
  :Log_event(buf, old_format),data_buf(0), query(NULL), db(NULL)
{
  ulong data_len;
  if (old_format)
  {
    if ((uint)event_len < OLD_HEADER_LEN + QUERY_HEADER_LEN)
      return;				
    data_len = event_len - (QUERY_HEADER_LEN + OLD_HEADER_LEN);
    buf += OLD_HEADER_LEN;
  }
  else
  {
    if ((uint)event_len < QUERY_EVENT_OVERHEAD)
      return;				
    data_len = event_len - QUERY_EVENT_OVERHEAD;
    buf += LOG_EVENT_HEADER_LEN;
  }

  exec_time = uint4korr(buf + Q_EXEC_TIME_OFFSET);
  error_code = uint2korr(buf + Q_ERR_CODE_OFFSET);

  if (!(data_buf = (char*) my_malloc(data_len + 1, MYF(MY_WME))))
    return;

  memcpy(data_buf, buf + Q_DATA_OFFSET, data_len);
  slave_proxy_id= thread_id= uint4korr(buf + Q_THREAD_ID_OFFSET);
  db = data_buf;
  db_len = (uint)buf[Q_DB_LEN_OFFSET];
  query=data_buf + db_len + 1;
  q_len = data_len - 1 - db_len;
  *((char*)query+q_len) = 0;
}


/*
  Query_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Query_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char buff[40],*end;				// Enough for SET TIMESTAMP
  const uint set_len= sizeof("SET ONE_SHOT CHARACTER_SET_CLIENT=") - 1;
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tQuery\tthread_id=%lu\texec_time=%lu\terror_code=%d\n",
	    (ulong) thread_id, (ulong) exec_time, error_code);
  }

  bool different_db= 1;

  if (!(flags & LOG_EVENT_SUPPRESS_USE_F))
  {
    if (db && last_db) 
    {
      if (different_db= memcmp(last_db, db, db_len + 1))
        memcpy(last_db, db, db_len + 1);
    }
    
    if (db && db[0] && different_db) 
    {
      fprintf(file, "use %s;\n", db);
    }
  }

  end=int10_to_str((long) when, strmov(buff,"SET TIMESTAMP="),10);
  *end++=';';
  *end++='\n';
  my_fwrite(file, (byte*) buff, (uint) (end-buff),MYF(MY_NABP | MY_WME));
  if (flags & LOG_EVENT_THREAD_SPECIFIC_F)
    fprintf(file,"SET @@session.pseudo_thread_id=%lu;\n",(ulong)thread_id);
  /* charset_name command for mysql client */
  if (!strncmp(query, "SET ONE_SHOT CHARACTER_SET_CLIENT=", set_len))
  {
    char * endptr;
    int cs_number= strtoul(query + set_len, &endptr, 10);
    DBUG_ASSERT(*endptr == ',');
    CHARSET_INFO *cs_info= get_charset(cs_number, MYF(MY_WME));
    if (cs_info) {
      fprintf(file, "/*!\\C %s */;\n", cs_info->csname);
    }
  }
  my_fwrite(file, (byte*) query, q_len, MYF(MY_NABP | MY_WME));
  fprintf(file, ";\n");
}
#endif /* MYSQL_CLIENT */


/*
  Query_log_event::exec_event()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Query_log_event::exec_event(struct st_relay_log_info* rli)
{
  int expected_error,actual_error= 0;
  thd->db_length= db_len;
  thd->db= (char*) rewrite_db(db, &thd->db_length);

  /*
    InnoDB internally stores the master log position it has processed so far;
    position to store is of the END of the current log event.
  */
#if MYSQL_VERSION_ID < 50000
  rli->future_group_master_log_pos= log_pos + get_event_len() -
    (rli->mi->old_format ? (LOG_EVENT_HEADER_LEN - OLD_HEADER_LEN) : 0);
#else
  /* In 5.0 we store the end_log_pos in the relay log so no problem */
  rli->future_group_master_log_pos= log_pos;
#endif
  clear_all_errors(thd, rli);

  /*
    Note:   We do not need to execute reset_one_shot_variables() if this
            db_ok() test fails.
    Reason: The db stored in binlog events is the same for SET and for
            its companion query.  If the SET is ignored because of
            db_ok(), the companion query will also be ignored, and if
            the companion query is ignored in the db_ok() test of
            ::exec_event(), then the companion SET also have so we
            don't need to reset_one_shot_variables().
  */
  if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->set_time((time_t)when);
    thd->query_length= q_len;
    thd->query = (char*)query;
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    thd->variables.pseudo_thread_id= thread_id;		// for temp tables

    DBUG_PRINT("query",("%s",thd->query));
    if (ignored_error_code((expected_error= error_code)) ||
	!check_expected_error(thd,rli,expected_error))
      mysql_parse(thd, thd->query, q_len);
    else
    {
      /*
        The query got a really bad error on the master (thread killed etc),
        which could be inconsistent. Parse it to test the table names: if the
        replicate-*-do|ignore-table rules say "this query must be ignored" then
        we exit gracefully; otherwise we warn about the bad error and tell DBA
        to check/fix it.
      */
      if (mysql_test_parse_for_slave(thd, thd->query, q_len))
        clear_all_errors(thd, rli);        /* Can ignore query */
      else
      {
        slave_print_error(rli,expected_error, 
                          "\
Query partially completed on the master (error on master: %d) \
and was aborted. There is a chance that your master is inconsistent at this \
point. If you are sure that your master is ok, run this query manually on the \
slave and then restart the slave with SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1; \
START SLAVE; . Query: '%s'", expected_error, thd->query);
        thd->query_error= 1;
      }
      goto end;
    }

    /* If the query was not ignored, it is printed to the general log */
    if (thd->net.last_errno != ER_SLAVE_IGNORED_TABLE)
      mysql_log.write(thd,COM_QUERY,"%s",thd->query);

    /*
      If we expected a non-zero error code, and we don't get the same error
      code, and none of them should be ignored.
    */
    DBUG_PRINT("info",("expected_error: %d  last_errno: %d",
		       expected_error, thd->net.last_errno));
    if ((expected_error != (actual_error= thd->net.last_errno)) &&
	expected_error &&
	!ignored_error_code(actual_error) &&
	!ignored_error_code(expected_error))
    {
      slave_print_error(rli, 0,
			"\
Query caused different errors on master and slave. \
Error on master: '%s' (%d), Error on slave: '%s' (%d). \
Default database: '%s'. Query: '%s'",
			ER_SAFE(expected_error),
			expected_error,
			actual_error ? thd->net.last_error: "no error",
			actual_error,
			print_slave_db_safe(thd->db), query);
      thd->query_error= 1;
    }
    /*
      If we get the same error code as expected, or they should be ignored. 
    */
    else if (expected_error == actual_error ||
	     ignored_error_code(actual_error))
    {
      DBUG_PRINT("info",("error ignored"));
      clear_all_errors(thd, rli);
    }
    /*
      Other cases: mostly we expected no error and get one.
    */
    else if (thd->query_error || thd->is_fatal_error)
    {
      slave_print_error(rli,actual_error,
			"Error '%s' on query. Default database: '%s'. Query: '%s'",
			(actual_error ? thd->net.last_error :
			 "unexpected success or fatal error"),
			print_slave_db_safe(thd->db), query);
      thd->query_error= 1;
    }
  } /* End of if (db_ok(... */

end:
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->db= 0;	                        // prevent db from being freed
  thd->query= 0;			// just to be sure
  thd->query_length= thd->db_length =0;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  close_thread_tables(thd);      
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  /*
    If there was an error we stop. Otherwise we increment positions. Note that
    we will not increment group* positions if we are just after a SET
    ONE_SHOT, because SET ONE_SHOT should not be separated from its following
    updating query.
  */
  return (thd->query_error ? thd->query_error : 
          (thd->one_shot_set ? (rli->inc_event_relay_log_pos(get_event_len()),0) :
           Log_event::exec_event(rli))); 
}
#endif


/**************************************************************************
	Start_log_event methods
**************************************************************************/

/*
  Start_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Start_log_event::pack_info(Protocol *protocol)
{
  char buf[12 + ST_SERVER_VER_LEN + 14 + 22], *pos;
  pos= strmov(buf, "Server ver: ");
  pos= strmov(pos, server_version);
  pos= strmov(pos, ", Binlog ver: ");
  pos= int10_to_str(binlog_version, pos, 10);
  protocol->store(buf, (uint) (pos-buf), &my_charset_bin);
}
#endif


/*
  Start_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Start_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tStart: binlog v %d, server v %s created ", binlog_version,
	  server_version);
  print_timestamp(file);
  if (created)
    fprintf(file," at startup");
  fputc('\n', file);
  fflush(file);
}
#endif /* MYSQL_CLIENT */

/*
  Start_log_event::Start_log_event()
*/

Start_log_event::Start_log_event(const char* buf,
				 bool old_format)
  :Log_event(buf, old_format)
{
  buf += (old_format) ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  binlog_version = uint2korr(buf+ST_BINLOG_VER_OFFSET);
  memcpy(server_version, buf+ST_SERVER_VER_OFFSET,
	 ST_SERVER_VER_LEN);
  created = uint4korr(buf+ST_CREATED_OFFSET);
}


/*
  Start_log_event::write_data()
*/

int Start_log_event::write_data(IO_CACHE* file)
{
  char buff[START_HEADER_LEN];
  int2store(buff + ST_BINLOG_VER_OFFSET,binlog_version);
  memcpy(buff + ST_SERVER_VER_OFFSET,server_version,ST_SERVER_VER_LEN);
  int4store(buff + ST_CREATED_OFFSET,created);
  return (my_b_safe_write(file, (byte*) buff, sizeof(buff)) ? -1 : 0);
}

/*
  Start_log_event::exec_event()

  The master started

  IMPLEMENTATION
    - To handle the case where the master died without having time to write
      DROP TEMPORARY TABLE, DO RELEASE_LOCK (prepared statements' deletion is
      TODO), we clean up all temporary tables that we got, if we are sure we
      can (see below).

  TODO
    - Remove all active user locks.
      Guilhem 2003-06: this is true but not urgent: the worst it can cause is
      the use of a bit of memory for a user lock which will not be used
      anymore. If the user lock is later used, the old one will be released. In
      other words, no deadlock problem.
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Start_log_event::exec_event(struct st_relay_log_info* rli)
{
  DBUG_ENTER("Start_log_event::exec_event");

  /*
    If the I/O thread has not started, mi->old_format is BINLOG_FORMAT_CURRENT
    (that's what the MASTER_INFO constructor does), so the test below is not
    perfect at all.
  */
  switch (rli->mi->old_format) {
  case BINLOG_FORMAT_CURRENT:
    /* 
       This is 4.x, so a Start_log_event is only at master startup,
       so we are sure the master has restarted and cleared his temp tables.
    */
    close_temporary_tables(thd);
    cleanup_load_tmpdir();
    /*
      As a transaction NEVER spans on 2 or more binlogs:
      if we have an active transaction at this point, the master died while
      writing the transaction to the binary log, i.e. while flushing the binlog
      cache to the binlog. As the write was started, the transaction had been
      committed on the master, so we lack of information to replay this
      transaction on the slave; all we can do is stop with error.
    */
    if (thd->options & OPTION_BEGIN)
    {
      slave_print_error(rli, 0, "\
Rolling back unfinished transaction (no COMMIT or ROLLBACK) from relay log. \
A probable cause is that the master died while writing the transaction to its \
binary log.");
      return(1);
    }
    break;

    /* 
       Now the older formats; in that case load_tmpdir is cleaned up by the I/O
       thread.
    */
  case BINLOG_FORMAT_323_LESS_57:
    /*
      Cannot distinguish a Start_log_event generated at master startup and
      one generated by master FLUSH LOGS, so cannot be sure temp tables
      have to be dropped. So do nothing.
    */
    break;
  case BINLOG_FORMAT_323_GEQ_57:
    /*
      Can distinguish, based on the value of 'created',
      which was generated at master startup.
    */
    if (created)
      close_temporary_tables(thd);
    break;
  default:
    /* this case is impossible */
    return 1;
  }

  DBUG_RETURN(Log_event::exec_event(rli));
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */

/**************************************************************************
	Load_log_event methods
**************************************************************************/

/*
  Load_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Load_log_event::pack_info(Protocol *protocol)
{
  char *buf, *pos;
  uint buf_len;

  buf_len= 
    5 + db_len + 3 +                        // "use DB; "
    18 + fname_len + 2 +                    // "LOAD DATA INFILE 'file''"
    7 +					    // LOCAL
    9 +                                     // " REPLACE or IGNORE "
    13 + table_name_len*2 +                 // "INTO TABLE `table`"
    21 + sql_ex.field_term_len*4 + 2 +      // " FIELDS TERMINATED BY 'str'"
    23 + sql_ex.enclosed_len*4 + 2 +        // " OPTIONALLY ENCLOSED BY 'str'"
    12 + sql_ex.escaped_len*4 + 2 +         // " ESCAPED BY 'str'"
    21 + sql_ex.line_term_len*4 + 2 +       // " FIELDS TERMINATED BY 'str'"
    19 + sql_ex.line_start_len*4 + 2 +      // " LINES STARTING BY 'str'" 
    15 + 22 +                               // " IGNORE xxx  LINES" 
    3 + (num_fields-1)*2 + field_block_len; // " (field1, field2, ...)"

  if (!(buf= my_malloc(buf_len, MYF(MY_WME))))
    return;
  pos= buf;
  if (db && db_len)
  {
    pos= strmov(pos, "use `");
    memcpy(pos, db, db_len);
    pos= strmov(pos+db_len, "`; ");
  }

  pos= strmov(pos, "LOAD DATA ");
  if (check_fname_outside_temp_buf())
    pos= strmov(pos, "LOCAL ");
  pos= strmov(pos, "INFILE '");
  memcpy(pos, fname, fname_len);
  pos= strmov(pos+fname_len, "' ");

  if (sql_ex.opt_flags & REPLACE_FLAG)
    pos= strmov(pos, " REPLACE ");
  else if (sql_ex.opt_flags & IGNORE_FLAG)
    pos= strmov(pos, " IGNORE ");

  pos= strmov(pos ,"INTO TABLE `");
  memcpy(pos, table_name, table_name_len);
  pos+= table_name_len;

  /* We have to create all optinal fields as the default is not empty */
  pos= strmov(pos, "` FIELDS TERMINATED BY ");
  pos= pretty_print_str(pos, sql_ex.field_term, sql_ex.field_term_len);
  if (sql_ex.opt_flags & OPT_ENCLOSED_FLAG)
    pos= strmov(pos, " OPTIONALLY ");
  pos= strmov(pos, " ENCLOSED BY ");
  pos= pretty_print_str(pos, sql_ex.enclosed, sql_ex.enclosed_len);

  pos= strmov(pos, " ESCAPED BY ");
  pos= pretty_print_str(pos, sql_ex.escaped, sql_ex.escaped_len);

  pos= strmov(pos, " LINES TERMINATED BY ");
  pos= pretty_print_str(pos, sql_ex.line_term, sql_ex.line_term_len);
  if (sql_ex.line_start_len)
  {
    pos= strmov(pos, " STARTING BY ");
    pos= pretty_print_str(pos, sql_ex.line_start, sql_ex.line_start_len);
  }

  if ((long) skip_lines > 0)
  {
    pos= strmov(pos, " IGNORE ");
    pos= longlong10_to_str((longlong) skip_lines, pos, 10);
    pos= strmov(pos," LINES ");    
  }

  if (num_fields)
  {
    uint i;
    const char *field= fields;
    pos= strmov(pos, " (");
    for (i = 0; i < num_fields; i++)
    {
      if (i)
      {
        *pos++= ' ';
        *pos++= ',';
      }
      memcpy(pos, field, field_lens[i]);
      pos+=   field_lens[i];
      field+= field_lens[i]  + 1;
    }
    *pos++= ')';
  }

  protocol->store(buf, pos-buf, &my_charset_bin);
  my_free(buf, MYF(0));
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/*
  Load_log_event::write_data_header()
*/

int Load_log_event::write_data_header(IO_CACHE* file)
{
  char buf[LOAD_HEADER_LEN];
  int4store(buf + L_THREAD_ID_OFFSET, slave_proxy_id);
  int4store(buf + L_EXEC_TIME_OFFSET, exec_time);
  int4store(buf + L_SKIP_LINES_OFFSET, skip_lines);
  buf[L_TBL_LEN_OFFSET] = (char)table_name_len;
  buf[L_DB_LEN_OFFSET] = (char)db_len;
  int4store(buf + L_NUM_FIELDS_OFFSET, num_fields);
  return my_b_safe_write(file, (byte*)buf, LOAD_HEADER_LEN);
}


/*
  Load_log_event::write_data_body()
*/

int Load_log_event::write_data_body(IO_CACHE* file)
{
  if (sql_ex.write_data(file))
    return 1;
  if (num_fields && fields && field_lens)
  {
    if (my_b_safe_write(file, (byte*)field_lens, num_fields) ||
	my_b_safe_write(file, (byte*)fields, field_block_len))
      return 1;
  }
  return (my_b_safe_write(file, (byte*)table_name, table_name_len + 1) ||
	  my_b_safe_write(file, (byte*)db, db_len + 1) ||
	  my_b_safe_write(file, (byte*)fname, fname_len));
}


/*
  Load_log_event::Load_log_event()
*/

#ifndef MYSQL_CLIENT
Load_log_event::Load_log_event(THD *thd_arg, sql_exchange *ex,
			       const char *db_arg, const char *table_name_arg,
			       List<Item> &fields_arg,
			       enum enum_duplicates handle_dup,
			       bool ignore, bool using_trans)
  :Log_event(thd_arg, !thd_arg->tmp_table_used ?
	     0 : LOG_EVENT_THREAD_SPECIFIC_F, using_trans),
   thread_id(thd_arg->thread_id),
   slave_proxy_id(thd_arg->variables.pseudo_thread_id),
   num_fields(0),fields(0),
   field_lens(0),field_block_len(0),
   table_name(table_name_arg ? table_name_arg : ""),
   db(db_arg), fname(ex->file_name), local_fname(FALSE)
{
  time_t end_time;
  time(&end_time);
  exec_time = (ulong) (end_time  - thd_arg->start_time);
  /* db can never be a zero pointer in 4.0 */
  db_len = (uint32) strlen(db);
  table_name_len = (uint32) strlen(table_name);
  fname_len = (fname) ? (uint) strlen(fname) : 0;
  sql_ex.field_term = (char*) ex->field_term->ptr();
  sql_ex.field_term_len = (uint8) ex->field_term->length();
  sql_ex.enclosed = (char*) ex->enclosed->ptr();
  sql_ex.enclosed_len = (uint8) ex->enclosed->length();
  sql_ex.line_term = (char*) ex->line_term->ptr();
  sql_ex.line_term_len = (uint8) ex->line_term->length();
  sql_ex.line_start = (char*) ex->line_start->ptr();
  sql_ex.line_start_len = (uint8) ex->line_start->length();
  sql_ex.escaped = (char*) ex->escaped->ptr();
  sql_ex.escaped_len = (uint8) ex->escaped->length();
  sql_ex.opt_flags = 0;
  sql_ex.cached_new_format = -1;
    
  if (ex->dumpfile)
    sql_ex.opt_flags|= DUMPFILE_FLAG;
  if (ex->opt_enclosed)
    sql_ex.opt_flags|= OPT_ENCLOSED_FLAG;

  sql_ex.empty_flags= 0;

  switch (handle_dup) {
  case DUP_REPLACE:
    sql_ex.opt_flags|= REPLACE_FLAG;
    break;
  case DUP_UPDATE:				// Impossible here
  case DUP_ERROR:
    break;	
  }
  if (ignore)
    sql_ex.opt_flags|= IGNORE_FLAG;

  if (!ex->field_term->length())
    sql_ex.empty_flags |= FIELD_TERM_EMPTY;
  if (!ex->enclosed->length())
    sql_ex.empty_flags |= ENCLOSED_EMPTY;
  if (!ex->line_term->length())
    sql_ex.empty_flags |= LINE_TERM_EMPTY;
  if (!ex->line_start->length())
    sql_ex.empty_flags |= LINE_START_EMPTY;
  if (!ex->escaped->length())
    sql_ex.empty_flags |= ESCAPED_EMPTY;
    
  skip_lines = ex->skip_lines;

  List_iterator<Item> li(fields_arg);
  field_lens_buf.length(0);
  fields_buf.length(0);
  Item* item;
  while ((item = li++))
  {
    num_fields++;
    uchar len = (uchar) strlen(item->name);
    field_block_len += len + 1;
    fields_buf.append(item->name, len + 1);
    field_lens_buf.append((char*)&len, 1);
  }

  field_lens = (const uchar*)field_lens_buf.ptr();
  fields = fields_buf.ptr();
}
#endif /* !MYSQL_CLIENT */

/*
  Load_log_event::Load_log_event()

  NOTE
    The caller must do buf[event_len] = 0 before he starts using the
    constructed event.
*/

Load_log_event::Load_log_event(const char *buf, int event_len,
			       bool old_format)
  :Log_event(buf, old_format), num_fields(0), fields(0),
   field_lens(0), field_block_len(0),
   table_name(0), db(0), fname(0), local_fname(FALSE)
{
  DBUG_ENTER("Load_log_event");
  if (event_len) // derived class, will call copy_log_event() itself
    copy_log_event(buf, event_len, old_format);
  DBUG_VOID_RETURN;
}


/*
  Load_log_event::copy_log_event()
*/

int Load_log_event::copy_log_event(const char *buf, ulong event_len,
				   bool old_format)
{
  uint data_len;
  char* buf_end = (char*)buf + event_len;
  uint header_len= old_format ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  const char* data_head = buf + header_len;
  DBUG_ENTER("Load_log_event::copy_log_event");

  slave_proxy_id= thread_id= uint4korr(data_head + L_THREAD_ID_OFFSET);
  exec_time = uint4korr(data_head + L_EXEC_TIME_OFFSET);
  skip_lines = uint4korr(data_head + L_SKIP_LINES_OFFSET);
  table_name_len = (uint)data_head[L_TBL_LEN_OFFSET];
  db_len = (uint)data_head[L_DB_LEN_OFFSET];
  num_fields = uint4korr(data_head + L_NUM_FIELDS_OFFSET);
	  
  int body_offset = ((buf[EVENT_TYPE_OFFSET] == LOAD_EVENT) ?
		     LOAD_HEADER_LEN + header_len :
		     get_data_body_offset());
  
  if ((int) event_len < body_offset)
    DBUG_RETURN(1);
  /*
    Sql_ex.init() on success returns the pointer to the first byte after
    the sql_ex structure, which is the start of field lengths array.
  */
  if (!(field_lens=(uchar*)sql_ex.init((char*)buf + body_offset,
				       buf_end,
				       buf[EVENT_TYPE_OFFSET] != LOAD_EVENT)))
    DBUG_RETURN(1);

  data_len = event_len - body_offset;
  if (num_fields > data_len) // simple sanity check against corruption
    DBUG_RETURN(1);
  for (uint i = 0; i < num_fields; i++)
    field_block_len += (uint)field_lens[i] + 1;

  fields = (char*)field_lens + num_fields;
  table_name  = fields + field_block_len;
  db = table_name + table_name_len + 1;
  fname = db + db_len + 1;
  fname_len = strlen(fname);
  // null termination is accomplished by the caller doing buf[event_len]=0
  DBUG_RETURN(0);
}


/*
  Load_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Load_log_event::print(FILE* file, bool short_form, char* last_db)
{
  print(file, short_form, last_db, 0);
}


void Load_log_event::print(FILE* file, bool short_form, char* last_db,
			   bool commented)
{
  DBUG_ENTER("Load_log_event::print");
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tQuery\tthread_id=%ld\texec_time=%ld\n",
	    thread_id, exec_time);
  }

  bool different_db= 1;
  if (db && last_db)
  {
    /*
      If the database is different from the one of the previous statement, we
      need to print the "use" command, and we update the last_db.
      But if commented, the "use" is going to be commented so we should not
      update the last_db.
    */
    if ((different_db= memcmp(last_db, db, db_len + 1)) &&
        !commented)
      memcpy(last_db, db, db_len + 1);
  }
  
  if (db && db[0] && different_db)
    fprintf(file, "%suse %s;\n", 
            commented ? "# " : "",
            db);

  if (flags & LOG_EVENT_THREAD_SPECIFIC_F)
    fprintf(file,"%sSET @@session.pseudo_thread_id=%lu;\n",
            commented ? "# " : "", (ulong)thread_id);
  fprintf(file, "%sLOAD DATA ",
          commented ? "# " : "");
  if (check_fname_outside_temp_buf())
    fprintf(file, "LOCAL ");
  fprintf(file, "INFILE '%-*s' ", fname_len, fname);

  if (sql_ex.opt_flags & REPLACE_FLAG)
    fprintf(file," REPLACE ");
  else if (sql_ex.opt_flags & IGNORE_FLAG)
    fprintf(file," IGNORE ");
  
  fprintf(file, "INTO TABLE `%s`", table_name);
  fprintf(file, " FIELDS TERMINATED BY ");
  pretty_print_str(file, sql_ex.field_term, sql_ex.field_term_len);

  if (sql_ex.opt_flags & OPT_ENCLOSED_FLAG)
    fprintf(file," OPTIONALLY ");
  fprintf(file, " ENCLOSED BY ");
  pretty_print_str(file, sql_ex.enclosed, sql_ex.enclosed_len);
     
  fprintf(file, " ESCAPED BY ");
  pretty_print_str(file, sql_ex.escaped, sql_ex.escaped_len);
     
  fprintf(file," LINES TERMINATED BY ");
  pretty_print_str(file, sql_ex.line_term, sql_ex.line_term_len);


  if (sql_ex.line_start)
  {
    fprintf(file," STARTING BY ");
    pretty_print_str(file, sql_ex.line_start, sql_ex.line_start_len);
  }
  if ((long) skip_lines > 0)
    fprintf(file, " IGNORE %ld LINES", (long) skip_lines);

  if (num_fields)
  {
    uint i;
    const char* field = fields;
    fprintf(file, " (");
    for (i = 0; i < num_fields; i++)
    {
      if (i)
	fputc(',', file);
      fprintf(file, field);
	  
      field += field_lens[i]  + 1;
    }
    fputc(')', file);
  }

  fprintf(file, ";\n");
  DBUG_VOID_RETURN;
}
#endif /* MYSQL_CLIENT */


/*
  Load_log_event::set_fields()

  Note that this function can not use the member variable 
  for the database, since LOAD DATA INFILE on the slave
  can be for a different database than the current one.
  This is the reason for the affected_db argument to this method.
*/

#ifndef MYSQL_CLIENT
void Load_log_event::set_fields(const char* affected_db, 
				List<Item> &field_list)
{
  uint i;
  const char* field = fields;
  for (i= 0; i < num_fields; i++)
  {
    field_list.push_back(new Item_field(affected_db, table_name, field));
    field+= field_lens[i]  + 1;
  }
}
#endif /* !MYSQL_CLIENT */


#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
/*
  Does the data loading job when executing a LOAD DATA on the slave

  SYNOPSIS
    Load_log_event::exec_event
      net  
      rli                             
      use_rli_only_for_errors	  - if set to 1, rli is provided to 
                                  Load_log_event::exec_event only for this 
				  function to have RPL_LOG_NAME and 
				  rli->last_slave_error, both being used by 
				  error reports. rli's position advancing
				  is skipped (done by the caller which is
				  Execute_load_log_event::exec_event).
				  - if set to 0, rli is provided for full use,
				  i.e. for error reports and position
				  advancing.

  DESCRIPTION
    Does the data loading job when executing a LOAD DATA on the slave
 
  RETURN VALUE
    0           Success                                                 
    1    	Failure
*/

int Load_log_event::exec_event(NET* net, struct st_relay_log_info* rli, 
			       bool use_rli_only_for_errors)
{
  char *load_data_query= 0;
  thd->db_length= db_len;
  thd->db= (char*) rewrite_db(db, &thd->db_length);
  DBUG_ASSERT(thd->query == 0);
  thd->query_length= 0;                         // Should not be needed
  thd->query_error= 0;
  clear_all_errors(thd, rli);
  /*
    Usually mysql_init_query() is called by mysql_parse(), but we need it here
    as the present method does not call mysql_parse().
  */
  mysql_init_query(thd, 0, 0);
  if (!use_rli_only_for_errors)
  {
#if MYSQL_VERSION_ID < 50000
    rli->future_group_master_log_pos= log_pos + get_event_len() -
      (rli->mi->old_format ? (LOG_EVENT_HEADER_LEN - OLD_HEADER_LEN) : 0);
#else
    rli->future_group_master_log_pos= log_pos;
#endif
  }

  /*
    We test replicate_*_db rules. Note that we have already prepared the file
    to load, even if we are going to ignore and delete it now. So it is
    possible that we did a lot of disk writes for nothing. In other words, a
    big LOAD DATA INFILE on the master will still consume a lot of space on
    the slave (space in the relay log + space of temp files: twice the space
    of the file to load...) even if it will finally be ignored.
    TODO: fix this; this can be done by testing rules in
    Create_file_log_event::exec_event() and then discarding Append_block and
    al. Another way is do the filtering in the I/O thread (more efficient: no
    disk writes at all).


    Note:   We do not need to execute reset_one_shot_variables() if this
            db_ok() test fails.
    Reason: The db stored in binlog events is the same for SET and for
            its companion query.  If the SET is ignored because of
            db_ok(), the companion query will also be ignored, and if
            the companion query is ignored in the db_ok() test of
            ::exec_event(), then the companion SET also have so we
            don't need to reset_one_shot_variables().
  */
  if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->set_time((time_t)when);
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    /*
      Initing thd->row_count is not necessary in theory as this variable has no
      influence in the case of the slave SQL thread (it is used to generate a
      "data truncated" warning but which is absorbed and never gets to the
      error log); still we init it to avoid a Valgrind message.
    */
    mysql_reset_errors(thd);

    TABLE_LIST tables;
    bzero((char*) &tables,sizeof(tables));
    tables.db = thd->db;
    tables.alias = tables.real_name = (char*)table_name;
    tables.lock_type = TL_WRITE;
    tables.updating= 1;

    // the table will be opened in mysql_load    
    if (table_rules_on && !tables_ok(thd, &tables))
    {
      // TODO: this is a bug - this needs to be moved to the I/O thread
      if (net)
        skip_load_data_infile(net);
    }
    else
    {
      char llbuff[22];
      enum enum_duplicates handle_dup;
      bool ignore= 0;
      /*
        Make a simplified LOAD DATA INFILE query, for the information of the
        user in SHOW PROCESSLIST. Note that db is known in the 'db' column.
      */
      if ((load_data_query= (char *) my_alloca(18 + strlen(fname) + 14 +
                                               strlen(tables.real_name) + 8)))
      {
        thd->query_length= (uint)(strxmov(load_data_query,
                                          "LOAD DATA INFILE '", fname,
                                          "' INTO TABLE `", tables.real_name,
                                          "` <...>", NullS) - load_data_query);
        thd->query= load_data_query;
      }

      if (sql_ex.opt_flags & REPLACE_FLAG)
      {
	handle_dup= DUP_REPLACE;
      }
      else if (sql_ex.opt_flags & IGNORE_FLAG)
      {
        ignore= 1;
        handle_dup= DUP_ERROR;
      }
      else
      {
        /*
	  When replication is running fine, if it was DUP_ERROR on the
          master then we could choose IGNORE here, because if DUP_ERROR
          suceeded on master, and data is identical on the master and slave,
          then there should be no uniqueness errors on slave, so IGNORE is
          the same as DUP_ERROR. But in the unlikely case of uniqueness errors
          (because the data on the master and slave happen to be different
	  (user error or bug), we want LOAD DATA to print an error message on
	  the slave to discover the problem.

          If reading from net (a 3.23 master), mysql_load() will change this
          to IGNORE.
        */
        handle_dup= DUP_ERROR;
      }
      /*
        We need to set thd->lex->sql_command and thd->lex->duplicates
        since InnoDB tests these variables to decide if this is a LOAD
        DATA ... REPLACE INTO ... statement even though mysql_parse()
        is not called.  This is not needed in 5.0 since there the LOAD
        DATA ... statement is replicated using mysql_parse(), which
        sets the thd->lex fields correctly.
      */
      thd->lex->sql_command= SQLCOM_LOAD;
      thd->lex->duplicates= handle_dup;

      sql_exchange ex((char*)fname, sql_ex.opt_flags & DUMPFILE_FLAG);
      String field_term(sql_ex.field_term,sql_ex.field_term_len,log_cs);
      String enclosed(sql_ex.enclosed,sql_ex.enclosed_len,log_cs);
      String line_term(sql_ex.line_term,sql_ex.line_term_len,log_cs);
      String line_start(sql_ex.line_start,sql_ex.line_start_len,log_cs);
      String escaped(sql_ex.escaped,sql_ex.escaped_len, log_cs);
      ex.field_term= &field_term;
      ex.enclosed= &enclosed;
      ex.line_term= &line_term;
      ex.line_start= &line_start;
      ex.escaped= &escaped;

      ex.opt_enclosed = (sql_ex.opt_flags & OPT_ENCLOSED_FLAG);
      if (sql_ex.empty_flags & FIELD_TERM_EMPTY)
	ex.field_term->length(0);

      ex.skip_lines = skip_lines;
      List<Item> field_list;
      set_fields(thd->db,field_list);
      thd->variables.pseudo_thread_id= thread_id;
      if (net)
      {
	// mysql_load will use thd->net to read the file
	thd->net.vio = net->vio;
	/*
	  Make sure the client does not get confused about the packet sequence
	*/
	thd->net.pkt_nr = net->pkt_nr;
      }
      if (mysql_load(thd, &ex, &tables, field_list, handle_dup, ignore, net != 0,
		     TL_WRITE))
	thd->query_error = 1;
      if (thd->cuted_fields)
      {
	/* log_pos is the position of the LOAD event in the master log */
        sql_print_warning("Slave: load data infile on table '%s' at "
                          "log position %s in log '%s' produced %ld "
                          "warning(s). Default database: '%s'",
                          (char*) table_name,
                          llstr(log_pos,llbuff), RPL_LOG_NAME, 
                          (ulong) thd->cuted_fields,
                          print_slave_db_safe(thd->db));
      }
      if (net)
        net->pkt_nr= thd->net.pkt_nr;
    }
  }
  else
  {
    /*
      We will just ask the master to send us /dev/null if we do not
      want to load the data.
      TODO: this a bug - needs to be done in I/O thread
    */
    if (net)
      skip_load_data_infile(net);
  }
	    
  thd->net.vio = 0; 
  char *save_db= thd->db;
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->db= 0;
  thd->query= 0;
  thd->query_length= thd->db_length= 0;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  close_thread_tables(thd);
  if (load_data_query)
    my_afree(load_data_query);
  if (thd->query_error)
  {
    /* this err/sql_errno code is copy-paste from send_error() */
    const char *err;
    int sql_errno;
    if ((err=thd->net.last_error)[0])
      sql_errno=thd->net.last_errno;
    else
    {
      sql_errno=ER_UNKNOWN_ERROR;
      err=ER(sql_errno);       
    }
    slave_print_error(rli,sql_errno,"\
Error '%s' running LOAD DATA INFILE on table '%s'. Default database: '%s'",
		      err, (char*)table_name, print_slave_db_safe(save_db));
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
    return 1;
  }
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
	    
  if (thd->is_fatal_error)
  {
    slave_print_error(rli,ER_UNKNOWN_ERROR, "\
Fatal error running LOAD DATA INFILE on table '%s'. Default database: '%s'",
		      (char*)table_name, print_slave_db_safe(save_db));
    return 1;
  }

  return ( use_rli_only_for_errors ? 0 : Log_event::exec_event(rli) ); 
}
#endif


/**************************************************************************
  Rotate_log_event methods
**************************************************************************/

/*
  Rotate_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Rotate_log_event::pack_info(Protocol *protocol)
{
  char buf1[256], buf[22];
  String tmp(buf1, sizeof(buf1), log_cs);
  tmp.length(0);
  tmp.append(new_log_ident, ident_len);
  tmp.append(";pos=");
  tmp.append(llstr(pos,buf));
  protocol->store(tmp.ptr(), tmp.length(), &my_charset_bin);
}
#endif


/*
  Rotate_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Rotate_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char buf[22];
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tRotate to ");
  if (new_log_ident)
    my_fwrite(file, (byte*) new_log_ident, (uint)ident_len, 
	      MYF(MY_NABP | MY_WME));
  fprintf(file, "  pos: %s", llstr(pos, buf));
  fputc('\n', file);
  fflush(file);
}
#endif /* MYSQL_CLIENT */



/*
  Rotate_log_event::Rotate_log_event() (2 constructors)
*/


#ifndef MYSQL_CLIENT
Rotate_log_event::Rotate_log_event(THD* thd_arg,
                                   const char* new_log_ident_arg,
                                   uint ident_len_arg, ulonglong pos_arg,
                                   uint flags_arg)
  :Log_event(), new_log_ident(new_log_ident_arg),
   pos(pos_arg),ident_len(ident_len_arg ? ident_len_arg :
                          (uint) strlen(new_log_ident_arg)), flags(flags_arg)
{
#ifndef DBUG_OFF
  char buff[22];
  DBUG_ENTER("Rotate_log_event::Rotate_log_event(THD*,...)");
  DBUG_PRINT("enter",("new_log_ident %s pos %s flags %lu", new_log_ident_arg,
                      llstr(pos_arg, buff), flags));
#endif
  if (flags & DUP_NAME)
    new_log_ident= my_strdup_with_length((byte*) new_log_ident_arg,
                                         ident_len,
                                         MYF(MY_WME));
  DBUG_VOID_RETURN;
}
#endif


Rotate_log_event::Rotate_log_event(const char* buf, int event_len,
				   bool old_format)
  :Log_event(buf, old_format), new_log_ident(0), flags(DUP_NAME)
{
  // The caller will ensure that event_len is what we have at EVENT_LEN_OFFSET
  int header_size = (old_format) ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  uint ident_offset;
  DBUG_ENTER("Rotate_log_event::Rotate_log_event(char*,...)");

  if (event_len < header_size)
    DBUG_VOID_RETURN;

  buf += header_size;
  if (old_format)
  {
    ident_len = (uint)(event_len - OLD_HEADER_LEN);
    pos = 4;
    ident_offset = 0;
  }
  else
  {
    ident_len = (uint)(event_len - ROTATE_EVENT_OVERHEAD);
    pos = uint8korr(buf + R_POS_OFFSET);
    ident_offset = ROTATE_HEADER_LEN;
  }
  set_if_smaller(ident_len,FN_REFLEN-1);
  new_log_ident= my_strdup_with_length((byte*) buf + ident_offset,
                                       (uint) ident_len,
                                       MYF(MY_WME));
  DBUG_VOID_RETURN;
}


/*
  Rotate_log_event::write_data()
*/

int Rotate_log_event::write_data(IO_CACHE* file)
{
  char buf[ROTATE_HEADER_LEN];
  DBUG_ASSERT(!(flags & ZERO_LEN)); // such an event cannot be written
  int8store(buf + R_POS_OFFSET, pos);
  return (my_b_safe_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
	  my_b_safe_write(file, (byte*)new_log_ident, (uint) ident_len));
}


/*
  Rotate_log_event::exec_event()

  Got a rotate log even from the master

  IMPLEMENTATION
    This is mainly used so that we can later figure out the logname and
    position for the master.

    We can't rotate the slave as this will cause infinitive rotations
    in a A -> B -> A setup.

  RETURN VALUES
    0	ok
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Rotate_log_event::exec_event(struct st_relay_log_info* rli)
{
  DBUG_ENTER("Rotate_log_event::exec_event");

  pthread_mutex_lock(&rli->data_lock);
  rli->event_relay_log_pos += get_event_len();
  /*
    If we are in a transaction: the only normal case is when the I/O thread was
    copying a big transaction, then it was stopped and restarted: we have this
    in the relay log:
    BEGIN
    ...
    ROTATE (a fake one)
    ...
    COMMIT or ROLLBACK
    In that case, we don't want to touch the coordinates which correspond to
    the beginning of the transaction.
  */
  if (!(thd->options & OPTION_BEGIN))
  {
    memcpy(rli->group_master_log_name, new_log_ident, ident_len+1);
    rli->notify_group_master_log_name_update();
    rli->group_master_log_pos = pos;
    rli->group_relay_log_pos = rli->event_relay_log_pos;
    DBUG_PRINT("info", ("group_master_log_pos: %lu",
                        (ulong) rli->group_master_log_pos));
  }
  pthread_mutex_unlock(&rli->data_lock);
  pthread_cond_broadcast(&rli->data_cond);
  flush_relay_log_info(rli);
  DBUG_RETURN(0);
}
#endif


/**************************************************************************
	Intvar_log_event methods
**************************************************************************/

/*
  Intvar_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Intvar_log_event::pack_info(Protocol *protocol)
{
  char buf[256], *pos;
  pos= strmake(buf, get_var_type_name(), sizeof(buf)-23);
  *pos++= '=';
  pos= longlong10_to_str(val, pos, -10);
  protocol->store(buf, (uint) (pos-buf), &my_charset_bin);
}
#endif


/*
  Intvar_log_event::Intvar_log_event()
*/

Intvar_log_event::Intvar_log_event(const char* buf, bool old_format)
  :Log_event(buf, old_format)
{
  buf += (old_format) ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  type = buf[I_TYPE_OFFSET];
  val = uint8korr(buf+I_VAL_OFFSET);
}


/*
  Intvar_log_event::get_var_type_name()
*/

const char* Intvar_log_event::get_var_type_name()
{
  switch(type) {
  case LAST_INSERT_ID_EVENT: return "LAST_INSERT_ID";
  case INSERT_ID_EVENT: return "INSERT_ID";
  default: /* impossible */ return "UNKNOWN";
  }
}


/*
  Intvar_log_event::write_data()
*/

int Intvar_log_event::write_data(IO_CACHE* file)
{
  char buf[9];
  buf[I_TYPE_OFFSET] = type;
  int8store(buf + I_VAL_OFFSET, val);
  return my_b_safe_write(file, (byte*) buf, sizeof(buf));
}


/*
  Intvar_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Intvar_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char llbuff[22];
  const char *msg;
  LINT_INIT(msg);

  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tIntvar\n");
  }

  fprintf(file, "SET ");
  switch (type) {
  case LAST_INSERT_ID_EVENT:
    msg="LAST_INSERT_ID";
    break;
  case INSERT_ID_EVENT:
    msg="INSERT_ID";
    break;
  }
  fprintf(file, "%s=%s;\n", msg, llstr(val,llbuff));
  fflush(file);
}
#endif


/*
  Intvar_log_event::exec_event()
*/

#if defined(HAVE_REPLICATION)&& !defined(MYSQL_CLIENT)
int Intvar_log_event::exec_event(struct st_relay_log_info* rli)
{
  switch (type) {
  case LAST_INSERT_ID_EVENT:
    thd->last_insert_id = val;
    break;
  case INSERT_ID_EVENT:
    thd->next_insert_id = val;
    break;
  }
  rli->inc_event_relay_log_pos(get_event_len());
  return 0;
}
#endif


/**************************************************************************
  Rand_log_event methods
**************************************************************************/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Rand_log_event::pack_info(Protocol *protocol)
{
  char buf1[256], *pos;
  pos= strmov(buf1,"rand_seed1=");
  pos= int10_to_str((long) seed1, pos, 10);
  pos= strmov(pos, ",rand_seed2=");
  pos= int10_to_str((long) seed2, pos, 10);
  protocol->store(buf1, (uint) (pos-buf1), &my_charset_bin);
}
#endif


Rand_log_event::Rand_log_event(const char* buf, bool old_format)
  :Log_event(buf, old_format)
{
  buf += (old_format) ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  seed1 = uint8korr(buf+RAND_SEED1_OFFSET);
  seed2 = uint8korr(buf+RAND_SEED2_OFFSET);
}


int Rand_log_event::write_data(IO_CACHE* file)
{
  char buf[16];
  int8store(buf + RAND_SEED1_OFFSET, seed1);
  int8store(buf + RAND_SEED2_OFFSET, seed2);
  return my_b_safe_write(file, (byte*) buf, sizeof(buf));
}


#ifdef MYSQL_CLIENT
void Rand_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char llbuff[22],llbuff2[22];
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tRand\n");
  }
  fprintf(file, "SET @@RAND_SEED1=%s, @@RAND_SEED2=%s;\n",
	  llstr(seed1, llbuff),llstr(seed2, llbuff2));
  fflush(file);
}
#endif /* MYSQL_CLIENT */


#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Rand_log_event::exec_event(struct st_relay_log_info* rli)
{
  thd->rand.seed1= (ulong) seed1;
  thd->rand.seed2= (ulong) seed2;
  rli->inc_event_relay_log_pos(get_event_len());
  return 0;
}
#endif /* !MYSQL_CLIENT */


/**************************************************************************
  User_var_log_event methods
**************************************************************************/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void User_var_log_event::pack_info(Protocol* protocol)
{
  char *buf= 0;
  uint val_offset= 4 + name_len;
  uint event_len= val_offset;

  if (is_null)
  {
    buf= my_malloc(val_offset + 5, MYF(MY_WME));
    strmov(buf + val_offset, "NULL");
    event_len= val_offset + 4;
  }
  else
  {
    switch (type) {
    case REAL_RESULT:
      double real_val;
      float8get(real_val, val);
      buf= my_malloc(val_offset + FLOATING_POINT_BUFFER, MYF(MY_WME));
      event_len+= my_sprintf(buf + val_offset,
			     (buf + val_offset, "%.14g", real_val));
      break;
    case INT_RESULT:
      buf= my_malloc(val_offset + 22, MYF(MY_WME));
      event_len= longlong10_to_str(uint8korr(val), buf + val_offset,-10)-buf;
      break;
    case STRING_RESULT:
      /* 15 is for 'COLLATE' and other chars */
      buf= my_malloc(event_len+val_len*2+1+2*MY_CS_NAME_SIZE+15, MYF(MY_WME));
      CHARSET_INFO *cs;
      if (!(cs= get_charset(charset_number, MYF(0))))
      {
        strmov(buf+val_offset, "???");
        event_len+= 3;
      }
      else
      {
        char *p= strxmov(buf + val_offset, "_", cs->csname, " ", NullS);
        p= str_to_hex(p, val, val_len);
        p= strxmov(p, " COLLATE ", cs->name, NullS);
        event_len= p-buf;
      }
      break;
    case ROW_RESULT:
    default:
      DBUG_ASSERT(1);
      return;
    }
  }
  buf[0]= '@';
  buf[1]= '`';
  buf[2+name_len]= '`';
  buf[3+name_len]= '=';
  memcpy(buf+2, name, name_len);
  protocol->store(buf, event_len, &my_charset_bin);
  my_free(buf, MYF(MY_ALLOW_ZERO_PTR));
}
#endif /* !MYSQL_CLIENT */


User_var_log_event::User_var_log_event(const char* buf, bool old_format)
  :Log_event(buf, old_format)
{
  buf+= (old_format) ? OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN;
  name_len= uint4korr(buf);
  name= (char *) buf + UV_NAME_LEN_SIZE;
  buf+= UV_NAME_LEN_SIZE + name_len;
  is_null= (bool) *buf;
  if (is_null)
  {
    type= STRING_RESULT;
    charset_number= my_charset_bin.number;
    val_len= 0;
    val= 0;  
  }
  else
  {
    type= (Item_result) buf[UV_VAL_IS_NULL];
    charset_number= uint4korr(buf + UV_VAL_IS_NULL + UV_VAL_TYPE_SIZE);
    val_len= uint4korr(buf + UV_VAL_IS_NULL + UV_VAL_TYPE_SIZE + 
		       UV_CHARSET_NUMBER_SIZE);
    val= (char *) (buf + UV_VAL_IS_NULL + UV_VAL_TYPE_SIZE +
		   UV_CHARSET_NUMBER_SIZE + UV_VAL_LEN_SIZE);
  }
}


int User_var_log_event::write_data(IO_CACHE* file)
{
  char buf[UV_NAME_LEN_SIZE];
  char buf1[UV_VAL_IS_NULL + UV_VAL_TYPE_SIZE + 
	    UV_CHARSET_NUMBER_SIZE + UV_VAL_LEN_SIZE];
  char buf2[8], *pos= buf2;
  uint buf1_length;

  int4store(buf, name_len);
  
  if ((buf1[0]= is_null))
  {
    buf1_length= 1;
    val_len= 0;
  }    
  else
  {
    buf1[1]= type;
    int4store(buf1 + 2, charset_number);
    int4store(buf1 + 2 + UV_CHARSET_NUMBER_SIZE, val_len);
    buf1_length= 10;

    switch (type) {
    case REAL_RESULT:
      float8store(buf2, *(double*) val);
      break;
    case INT_RESULT:
      int8store(buf2, *(longlong*) val);
      break;
    case STRING_RESULT:
      pos= val;
      break;
    case ROW_RESULT:
    default:
      DBUG_ASSERT(1);
      return 0;
    }
  }
  return (my_b_safe_write(file, (byte*) buf, sizeof(buf))   ||
	  my_b_safe_write(file, (byte*) name, name_len)     ||
	  my_b_safe_write(file, (byte*) buf1, buf1_length) ||
	  my_b_safe_write(file, (byte*) pos, val_len));
}


/*
  User_var_log_event::print()
*/

#ifdef MYSQL_CLIENT
void User_var_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (!short_form)
  {
    print_header(file);
    fprintf(file, "\tUser_var\n");
  }

  fprintf(file, "SET @`");
  my_fwrite(file, (byte*) name, (uint) (name_len), MYF(MY_NABP | MY_WME));
  fprintf(file, "`");

  if (is_null)
  {
    fprintf(file, ":=NULL;\n");
  }
  else
  {
    switch (type) {
    case REAL_RESULT:
      double real_val;
      float8get(real_val, val);
      fprintf(file, ":=%.14g;\n", real_val);
      break;
    case INT_RESULT:
      char int_buf[22];
      longlong10_to_str(uint8korr(val), int_buf, -10);
      fprintf(file, ":=%s;\n", int_buf);
      break;
    case STRING_RESULT:
    {
      /*
        Let's express the string in hex. That's the most robust way. If we
        print it in character form instead, we need to escape it with
        character_set_client which we don't know (we will know it in 5.0, but
        in 4.1 we don't know it easily when we are printing
        User_var_log_event). Explanation why we would need to bother with
        character_set_client (quoting Bar):
        > Note, the parser doesn't switch to another unescaping mode after
        > it has met a character set introducer.
        > For example, if an SJIS client says something like:
        > SET @a= _ucs2 \0a\0b'
        > the string constant is still unescaped according to SJIS, not
        > according to UCS2.
      */
      char *hex_str;
      CHARSET_INFO *cs;

      if (!(hex_str= (char *)my_alloca(2*val_len+1+2))) // 2 hex digits / byte
        break; // no error, as we are 'void'
      str_to_hex(hex_str, val, val_len);
      /*
        For proper behaviour when mysqlbinlog|mysql, we need to explicitely
        specify the variable's collation. It will however cause problems when
        people want to mysqlbinlog|mysql into another server not supporting the
        character set. But there's not much to do about this and it's unlikely.
      */
      if (!(cs= get_charset(charset_number, MYF(0))))
        /*
          Generate an unusable command (=> syntax error) is probably the best
          thing we can do here.
        */
        fprintf(file, ":=???;\n");
      else
        fprintf(file, ":=_%s %s COLLATE `%s`;\n", cs->csname, hex_str, cs->name);
      my_afree(hex_str);
    }
      break;
    case ROW_RESULT:
    default:
      DBUG_ASSERT(1);
      return;
    }
  }
  fflush(file);
}
#endif


/*
  User_var_log_event::exec_event()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int User_var_log_event::exec_event(struct st_relay_log_info* rli)
{
  Item *it= 0;
  CHARSET_INFO *charset;
  if (!(charset= get_charset(charset_number, MYF(MY_WME))))
    return 1;
  LEX_STRING user_var_name;
  user_var_name.str= name;
  user_var_name.length= name_len;
  double real_val;
  longlong int_val;

  if (is_null)
  {
    it= new Item_null();
  }
  else
  {
    switch (type) {
    case REAL_RESULT:
      float8get(real_val, val);
      it= new Item_real(real_val);
      val= (char*) &real_val;		// Pointer to value in native format
      val_len= 8;
      break;
    case INT_RESULT:
      int_val= (longlong) uint8korr(val);
      it= new Item_int(int_val);
      val= (char*) &int_val;		// Pointer to value in native format
      val_len= 8;
      break;
    case STRING_RESULT:
      it= new Item_string(val, val_len, charset);
      break;
    case ROW_RESULT:
    default:
      DBUG_ASSERT(1);
      return 0;
    }
  }
  Item_func_set_user_var e(user_var_name, it);
  /*
    Item_func_set_user_var can't substitute something else on its place =>
    0 can be passed as last argument (reference on item)
  */
  e.fix_fields(thd, 0, 0);
  /*
    A variable can just be considered as a table with
    a single record and with a single column. Thus, like
    a column value, it could always have IMPLICIT derivation.
   */
  e.update_hash(val, val_len, type, charset, DERIVATION_IMPLICIT);
  free_root(thd->mem_root,0);

  rli->inc_event_relay_log_pos(get_event_len());
  return 0;
}
#endif /* !MYSQL_CLIENT */


/**************************************************************************
  Slave_log_event methods
**************************************************************************/

#ifdef HAVE_REPLICATION
#ifdef MYSQL_CLIENT
void Unknown_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "# %s", "Unknown event\n");
}
#endif  

#ifndef MYSQL_CLIENT
void Slave_log_event::pack_info(Protocol *protocol)
{
  char buf[256+HOSTNAME_LENGTH], *pos;
  pos= strmov(buf, "host=");
  pos= strnmov(pos, master_host, HOSTNAME_LENGTH);
  pos= strmov(pos, ",port=");
  pos= int10_to_str((long) master_port, pos, 10);
  pos= strmov(pos, ",log=");
  pos= strmov(pos, master_log);
  pos= strmov(pos, ",pos=");
  pos= longlong10_to_str(master_pos, pos, 10);
  protocol->store(buf, pos-buf, &my_charset_bin);
}
#endif /* !MYSQL_CLIENT */


#ifndef MYSQL_CLIENT
Slave_log_event::Slave_log_event(THD* thd_arg,
				 struct st_relay_log_info* rli)
  :Log_event(thd_arg, 0, 0), mem_pool(0), master_host(0)
{
  DBUG_ENTER("Slave_log_event");
  if (!rli->inited)				// QQ When can this happen ?
    DBUG_VOID_RETURN;
  
  MASTER_INFO* mi = rli->mi;
  // TODO: re-write this better without holding both locks at the same time
  pthread_mutex_lock(&mi->data_lock);
  pthread_mutex_lock(&rli->data_lock);
  master_host_len = strlen(mi->host);
  master_log_len = strlen(rli->group_master_log_name);
  // on OOM, just do not initialize the structure and print the error
  if ((mem_pool = (char*)my_malloc(get_data_size() + 1,
				   MYF(MY_WME))))
  {
    master_host = mem_pool + SL_MASTER_HOST_OFFSET ;
    memcpy(master_host, mi->host, master_host_len + 1);
    master_log = master_host + master_host_len + 1;
    memcpy(master_log, rli->group_master_log_name, master_log_len + 1);
    master_port = mi->port;
    master_pos = rli->group_master_log_pos;
    DBUG_PRINT("info", ("master_log: %s  pos: %d", master_log,
			(ulong) master_pos));
  }
  else
    sql_print_error("Out of memory while recording slave event");
  pthread_mutex_unlock(&rli->data_lock);
  pthread_mutex_unlock(&mi->data_lock);
  DBUG_VOID_RETURN;
}
#endif /* !MYSQL_CLIENT */


Slave_log_event::~Slave_log_event()
{
  my_free(mem_pool, MYF(MY_ALLOW_ZERO_PTR));
}


#ifdef MYSQL_CLIENT
void Slave_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char llbuff[22];
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "\
Slave: master_host: '%s'  master_port: %d  master_log: '%s'  master_pos: %s\n",
	  master_host, master_port, master_log, llstr(master_pos, llbuff));
}
#endif /* MYSQL_CLIENT */


int Slave_log_event::get_data_size()
{
  return master_host_len + master_log_len + 1 + SL_MASTER_HOST_OFFSET;
}


int Slave_log_event::write_data(IO_CACHE* file)
{
  int8store(mem_pool + SL_MASTER_POS_OFFSET, master_pos);
  int2store(mem_pool + SL_MASTER_PORT_OFFSET, master_port);
  // log and host are already there
  return my_b_safe_write(file, (byte*)mem_pool, get_data_size());
}


void Slave_log_event::init_from_mem_pool(int data_size)
{
  master_pos = uint8korr(mem_pool + SL_MASTER_POS_OFFSET);
  master_port = uint2korr(mem_pool + SL_MASTER_PORT_OFFSET);
  master_host = mem_pool + SL_MASTER_HOST_OFFSET;
  master_host_len = strlen(master_host);
  // safety
  master_log = master_host + master_host_len + 1;
  if (master_log > mem_pool + data_size)
  {
    master_host = 0;
    return;
  }
  master_log_len = strlen(master_log);
}


Slave_log_event::Slave_log_event(const char* buf, int event_len)
  :Log_event(buf,0),mem_pool(0),master_host(0)
{
  event_len -= LOG_EVENT_HEADER_LEN;
  if (event_len < 0)
    return;
  if (!(mem_pool = (char*) my_malloc(event_len + 1, MYF(MY_WME))))
    return;
  memcpy(mem_pool, buf + LOG_EVENT_HEADER_LEN, event_len);
  mem_pool[event_len] = 0;
  init_from_mem_pool(event_len);
}


#ifndef MYSQL_CLIENT
int Slave_log_event::exec_event(struct st_relay_log_info* rli)
{
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  return Log_event::exec_event(rli);
}
#endif /* !MYSQL_CLIENT */


/**************************************************************************
	Stop_log_event methods
**************************************************************************/

/*
  Stop_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Stop_log_event::print(FILE* file, bool short_form, char* last_db)
{
  if (short_form)
    return;

  print_header(file);
  fprintf(file, "\tStop\n");
  fflush(file);
}
#endif /* MYSQL_CLIENT */


/*
  Stop_log_event::exec_event()

  The master stopped. 
  We used to clean up all temporary tables but this is useless as, as the
  master has shut down properly, it has written all DROP TEMPORARY TABLE and DO
  RELEASE_LOCK (prepared statements' deletion is TODO).
  We used to clean up slave_load_tmpdir, but this is useless as it has been
  cleared at the end of LOAD DATA INFILE.
  So we have nothing to do here.
  The place were we must do this cleaning is in Start_log_event::exec_event(),
  not here. Because if we come here, the master was sane.
*/

#ifndef MYSQL_CLIENT
int Stop_log_event::exec_event(struct st_relay_log_info* rli)
{
  /*
    We do not want to update master_log pos because we get a rotate event
    before stop, so by now group_master_log_name is set to the next log.
    If we updated it, we will have incorrect master coordinates and this
    could give false triggers in MASTER_POS_WAIT() that we have reached
    the target position when in fact we have not.
  */
  rli->inc_group_relay_log_pos(get_event_len(), 0);
  flush_relay_log_info(rli);
  return 0;
}
#endif /* !MYSQL_CLIENT */
#endif /* HAVE_REPLICATION */


/**************************************************************************
	Create_file_log_event methods
**************************************************************************/

/*
  Create_file_log_event ctor
*/

#ifndef MYSQL_CLIENT
Create_file_log_event::
Create_file_log_event(THD* thd_arg, sql_exchange* ex,
		      const char* db_arg, const char* table_name_arg,
		      List<Item>& fields_arg, enum enum_duplicates handle_dup,
                      bool ignore,
		      char* block_arg, uint block_len_arg, bool using_trans)
  :Load_log_event(thd_arg,ex,db_arg,table_name_arg,fields_arg,handle_dup, ignore,
		  using_trans),
   fake_base(0), block(block_arg), event_buf(0), block_len(block_len_arg),
   file_id(thd_arg->file_id = mysql_bin_log.next_file_id())
{
  DBUG_ENTER("Create_file_log_event");
  sql_ex.force_new_format();
  DBUG_VOID_RETURN;
}
#endif /* !MYSQL_CLIENT */


/*
  Create_file_log_event::write_data_body()
*/

int Create_file_log_event::write_data_body(IO_CACHE* file)
{
  int res;
  if ((res = Load_log_event::write_data_body(file)) || fake_base)
    return res;
  return (my_b_safe_write(file, (byte*) "", 1) ||
	  my_b_safe_write(file, (byte*) block, block_len));
}


/*
  Create_file_log_event::write_data_header()
*/

int Create_file_log_event::write_data_header(IO_CACHE* file)
{
  int res;
  if ((res = Load_log_event::write_data_header(file)) || fake_base)
    return res;
  byte buf[CREATE_FILE_HEADER_LEN];
  int4store(buf + CF_FILE_ID_OFFSET, file_id);
  return my_b_safe_write(file, buf, CREATE_FILE_HEADER_LEN);
}


/*
  Create_file_log_event::write_base()
*/

int Create_file_log_event::write_base(IO_CACHE* file)
{
  int res;
  fake_base = 1; // pretend we are Load event
  res = write(file);
  fake_base = 0;
  return res;
}


/*
  Create_file_log_event ctor
*/

Create_file_log_event::Create_file_log_event(const char* buf, int len,
					     bool old_format)
  :Load_log_event(buf,0,old_format),fake_base(0),block(0),inited_from_old(0)
{
  int block_offset;
  DBUG_ENTER("Create_file_log_event");

  /*
    We must make copy of 'buf' as this event may have to live over a
    rotate log entry when used in mysqlbinlog
  */
  if (!(event_buf= my_memdup((byte*) buf, len, MYF(MY_WME))) ||
      (copy_log_event(event_buf, len, old_format)))
    DBUG_VOID_RETURN;

  if (!old_format)
  {
    file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN +
			+ LOAD_HEADER_LEN + CF_FILE_ID_OFFSET);
    // + 1 for \0 terminating fname  
    block_offset = (LOG_EVENT_HEADER_LEN + Load_log_event::get_data_size() +
		    CREATE_FILE_HEADER_LEN + 1);
    if (len < block_offset)
      return;
    block = (char*)buf + block_offset;
    block_len = len - block_offset;
  }
  else
  {
    sql_ex.force_new_format();
    inited_from_old = 1;
  }
  DBUG_VOID_RETURN;
}


/*
  Create_file_log_event::print()
*/

#ifdef MYSQL_CLIENT
void Create_file_log_event::print(FILE* file, bool short_form, 
				  char* last_db, bool enable_local)
{
  if (short_form)
  {
    if (enable_local && check_fname_outside_temp_buf())
      Load_log_event::print(file, 1, last_db);
    return;
  }

  if (enable_local)
  {
    Load_log_event::print(file, short_form, last_db, !check_fname_outside_temp_buf());
    /* 
       That one is for "file_id: etc" below: in mysqlbinlog we want the #, in
       SHOW BINLOG EVENTS we don't.
    */
    fprintf(file, "#"); 
  }

  fprintf(file, " file_id: %d  block_len: %d\n", file_id, block_len);
}


void Create_file_log_event::print(FILE* file, bool short_form,
				  char* last_db)
{
  print(file,short_form,last_db,0);
}
#endif /* MYSQL_CLIENT */


/*
  Create_file_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Create_file_log_event::pack_info(Protocol *protocol)
{
  char buf[NAME_LEN*2 + 30 + 21*2], *pos;
  pos= strmov(buf, "db=");
  memcpy(pos, db, db_len);
  pos= strmov(pos + db_len, ";table=");
  memcpy(pos, table_name, table_name_len);
  pos= strmov(pos + table_name_len, ";file_id=");
  pos= int10_to_str((long) file_id, pos, 10);
  pos= strmov(pos, ";block_len=");
  pos= int10_to_str((long) block_len, pos, 10);
  protocol->store(buf, (uint) (pos-buf), &my_charset_bin);
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/*
  Create_file_log_event::exec_event()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Create_file_log_event::exec_event(struct st_relay_log_info* rli)
{
  char proc_info[17+FN_REFLEN+10], *fname_buf= proc_info+17;
  char *p;
  int fd = -1;
  IO_CACHE file;
  int error = 1;

  bzero((char*)&file, sizeof(file));
  p = slave_load_file_stem(fname_buf, file_id, server_id);
  strmov(p, ".info");			// strmov takes less code than memcpy
  strnmov(proc_info, "Making temp file ", 17); // no end 0
  thd->proc_info= proc_info;
  my_delete(fname_buf, MYF(0)); // old copy may exist already
  if ((fd= my_create(fname_buf, CREATE_MODE,
		     O_WRONLY | O_BINARY | O_EXCL | O_NOFOLLOW,
		     MYF(MY_WME))) < 0 ||
      init_io_cache(&file, fd, IO_SIZE, WRITE_CACHE, (my_off_t)0, 0,
		    MYF(MY_WME|MY_NABP)))
  {
    slave_print_error(rli,my_errno, "Error in Create_file event: could not open file '%s'", fname_buf);
    goto err;
  }
  
  // a trick to avoid allocating another buffer
  strmov(p, ".data");
  fname = fname_buf;
  fname_len = (uint)(p-fname) + 5;
  if (write_base(&file))
  {
    strmov(p, ".info"); // to have it right in the error message
    slave_print_error(rli,my_errno,
		      "Error in Create_file event: could not write to file '%s'",
		      fname_buf);
    goto err;
  }
  end_io_cache(&file);
  my_close(fd, MYF(0));
  
  // fname_buf now already has .data, not .info, because we did our trick
  my_delete(fname_buf, MYF(0)); // old copy may exist already
  if ((fd= my_create(fname_buf, CREATE_MODE,
		     O_WRONLY | O_BINARY | O_EXCL | O_NOFOLLOW,
		     MYF(MY_WME))) < 0)
  {
    slave_print_error(rli,my_errno, "Error in Create_file event: could not open file '%s'", fname_buf);
    goto err;
  }
  if (my_write(fd, (byte*) block, block_len, MYF(MY_WME+MY_NABP)))
  {
    slave_print_error(rli,my_errno, "Error in Create_file event: write to '%s' failed", fname_buf);
    goto err;
  }
  error=0;					// Everything is ok

err:
  if (error)
    end_io_cache(&file);
  if (fd >= 0)
    my_close(fd, MYF(0));
  thd->proc_info= 0;
  return error ? 1 : Log_event::exec_event(rli);
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/**************************************************************************
	Append_block_log_event methods
**************************************************************************/

/*
  Append_block_log_event ctor
*/

#ifndef MYSQL_CLIENT  
Append_block_log_event::Append_block_log_event(THD* thd_arg, const char* db_arg,
					       char* block_arg,
					       uint block_len_arg,
					       bool using_trans)
  :Log_event(thd_arg,0, using_trans), block(block_arg),
   block_len(block_len_arg), file_id(thd_arg->file_id), db(db_arg)
{
}
#endif


/*
  Append_block_log_event ctor
*/

Append_block_log_event::Append_block_log_event(const char* buf, int len)
  :Log_event(buf, 0),block(0)
{
  DBUG_ENTER("Append_block_log_event");
  if ((uint)len < APPEND_BLOCK_EVENT_OVERHEAD)
    DBUG_VOID_RETURN;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + AB_FILE_ID_OFFSET);
  block = (char*)buf + APPEND_BLOCK_EVENT_OVERHEAD;
  block_len = len - APPEND_BLOCK_EVENT_OVERHEAD;
  DBUG_VOID_RETURN;
}


/*
  Append_block_log_event::write_data()
*/

int Append_block_log_event::write_data(IO_CACHE* file)
{
  byte buf[APPEND_BLOCK_HEADER_LEN];
  int4store(buf + AB_FILE_ID_OFFSET, file_id);
  return (my_b_safe_write(file, buf, APPEND_BLOCK_HEADER_LEN) ||
	  my_b_safe_write(file, (byte*) block, block_len));
}


/*
  Append_block_log_event::print()
*/

#ifdef MYSQL_CLIENT  
void Append_block_log_event::print(FILE* file, bool short_form,
				   char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Append_block: file_id: %d  block_len: %d\n",
	  file_id, block_len);
}
#endif /* MYSQL_CLIENT */


/*
  Append_block_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Append_block_log_event::pack_info(Protocol *protocol)
{
  char buf[256];
  uint length;
  length= (uint) my_sprintf(buf,
			    (buf, ";file_id=%u;block_len=%u", file_id,
			     block_len));
  protocol->store(buf, length, &my_charset_bin);
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/*
  Append_block_log_event::exec_event()
*/

#if defined( HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Append_block_log_event::exec_event(struct st_relay_log_info* rli)
{
  char proc_info[17+FN_REFLEN+10], *fname= proc_info+17;
  char *p= slave_load_file_stem(fname, file_id, server_id);
  int fd;
  int error = 1;
  DBUG_ENTER("Append_block_log_event::exec_event");

  memcpy(p, ".data", 6);
  strnmov(proc_info, "Making temp file ", 17); // no end 0
  thd->proc_info= proc_info;
  if ((fd = my_open(fname, O_WRONLY|O_APPEND|O_BINARY|O_NOFOLLOW, MYF(MY_WME))) < 0)
  {
    slave_print_error(rli,my_errno, "Error in Append_block event: could not open file '%s'", fname);
    goto err;
  }
  if (my_write(fd, (byte*) block, block_len, MYF(MY_WME+MY_NABP)))
  {
    slave_print_error(rli,my_errno, "Error in Append_block event: write to '%s' failed", fname);
    goto err;
  }
  error=0;

err:
  if (fd >= 0)
    my_close(fd, MYF(0));
  thd->proc_info= 0;
  DBUG_RETURN(error ? error : Log_event::exec_event(rli));
}
#endif


/**************************************************************************
	Delete_file_log_event methods
**************************************************************************/

/*
  Delete_file_log_event ctor
*/

#ifndef MYSQL_CLIENT
Delete_file_log_event::Delete_file_log_event(THD *thd_arg, const char* db_arg,
					     bool using_trans)
  :Log_event(thd_arg, 0, using_trans), file_id(thd_arg->file_id), db(db_arg)
{
}
#endif

/*
  Delete_file_log_event ctor
*/

Delete_file_log_event::Delete_file_log_event(const char* buf, int len)
  :Log_event(buf, 0),file_id(0)
{
  if ((uint)len < DELETE_FILE_EVENT_OVERHEAD)
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + AB_FILE_ID_OFFSET);
}


/*
  Delete_file_log_event::write_data()
*/

int Delete_file_log_event::write_data(IO_CACHE* file)
{
 byte buf[DELETE_FILE_HEADER_LEN];
 int4store(buf + DF_FILE_ID_OFFSET, file_id);
 return my_b_safe_write(file, buf, DELETE_FILE_HEADER_LEN);
}


/*
  Delete_file_log_event::print()
*/

#ifdef MYSQL_CLIENT  
void Delete_file_log_event::print(FILE* file, bool short_form,
				  char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Delete_file: file_id=%u\n", file_id);
}
#endif /* MYSQL_CLIENT */

/*
  Delete_file_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Delete_file_log_event::pack_info(Protocol *protocol)
{
  char buf[64];
  uint length;
  length= (uint) my_sprintf(buf, (buf, ";file_id=%u", (uint) file_id));
  protocol->store(buf, (int32) length, &my_charset_bin);
}
#endif

/*
  Delete_file_log_event::exec_event()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
int Delete_file_log_event::exec_event(struct st_relay_log_info* rli)
{
  char fname[FN_REFLEN+10];
  char *p= slave_load_file_stem(fname, file_id, server_id);
  memcpy(p, ".data", 6);
  (void) my_delete(fname, MYF(MY_WME));
  memcpy(p, ".info", 6);
  (void) my_delete(fname, MYF(MY_WME));
  return Log_event::exec_event(rli);
}
#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/**************************************************************************
	Execute_load_log_event methods
**************************************************************************/

/*
  Execute_load_log_event ctor
*/

#ifndef MYSQL_CLIENT  
Execute_load_log_event::Execute_load_log_event(THD *thd_arg, const char* db_arg,
					       bool using_trans)
  :Log_event(thd_arg, 0, using_trans), file_id(thd_arg->file_id), db(db_arg)
{
}
#endif
  

/*
  Execute_load_log_event ctor
*/

Execute_load_log_event::Execute_load_log_event(const char* buf, int len)
  :Log_event(buf, 0), file_id(0)
{
  if ((uint)len < EXEC_LOAD_EVENT_OVERHEAD)
    return;
  file_id = uint4korr(buf + LOG_EVENT_HEADER_LEN + EL_FILE_ID_OFFSET);
}


/*
  Execute_load_log_event::write_data()
*/

int Execute_load_log_event::write_data(IO_CACHE* file)
{
  byte buf[EXEC_LOAD_HEADER_LEN];
  int4store(buf + EL_FILE_ID_OFFSET, file_id);
  return my_b_safe_write(file, buf, EXEC_LOAD_HEADER_LEN);
}


/*
  Execute_load_log_event::print()
*/

#ifdef MYSQL_CLIENT  
void Execute_load_log_event::print(FILE* file, bool short_form,
				   char* last_db)
{
  if (short_form)
    return;
  print_header(file);
  fputc('\n', file);
  fprintf(file, "#Exec_load: file_id=%d\n",
	  file_id);
}
#endif

/*
  Execute_load_log_event::pack_info()
*/

#if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
void Execute_load_log_event::pack_info(Protocol *protocol)
{
  char buf[64];
  uint length;
  length= (uint) my_sprintf(buf, (buf, ";file_id=%u", (uint) file_id));
  protocol->store(buf, (int32) length, &my_charset_bin);
}


/*
  Execute_load_log_event::exec_event()
*/

int Execute_load_log_event::exec_event(struct st_relay_log_info* rli)
{
  char fname[FN_REFLEN+10];
  char *p= slave_load_file_stem(fname, file_id, server_id);
  int fd;
  int error = 1;
  IO_CACHE file;
  Load_log_event* lev = 0;

  memcpy(p, ".info", 6);
  if ((fd = my_open(fname, O_RDONLY|O_BINARY|O_NOFOLLOW, MYF(MY_WME))) < 0 ||
      init_io_cache(&file, fd, IO_SIZE, READ_CACHE, (my_off_t)0, 0,
		    MYF(MY_WME|MY_NABP)))
  {
    slave_print_error(rli,my_errno, "Error in Exec_load event: could not open file '%s'", fname);
    goto err;
  }
  if (!(lev = (Load_log_event*)Log_event::read_log_event(&file,
							 (pthread_mutex_t*)0,
							 (bool)0)) ||
      lev->get_type_code() != NEW_LOAD_EVENT)
  {
    slave_print_error(rli,0, "Error in Exec_load event: file '%s' appears corrupted", fname);
    goto err;
  }

  lev->thd = thd;
  /*
    lev->exec_event should use rli only for errors
    i.e. should not advance rli's position.
    lev->exec_event is the place where the table is loaded (it calls
    mysql_load()).
  */

#if MYSQL_VERSION_ID < 40100
    rli->future_master_log_pos= log_pos + get_event_len() -
      (rli->mi->old_format ? (LOG_EVENT_HEADER_LEN - OLD_HEADER_LEN) : 0);
#elif MYSQL_VERSION_ID < 50000
    rli->future_group_master_log_pos= log_pos + get_event_len() -
      (rli->mi->old_format ? (LOG_EVENT_HEADER_LEN - OLD_HEADER_LEN) : 0);
#else
    rli->future_group_master_log_pos= log_pos;
#endif
  if (lev->exec_event(0,rli,1)) 
  {
    /*
      We want to indicate the name of the file that could not be loaded
      (SQL_LOADxxx).
      But as we are here we are sure the error is in rli->last_slave_error and
      rli->last_slave_errno (example of error: duplicate entry for key), so we
      don't want to overwrite it with the filename.
      What we want instead is add the filename to the current error message.
    */
    char *tmp= my_strdup(rli->last_slave_error,MYF(MY_WME));
    if (tmp)
    {
      slave_print_error(rli,
			rli->last_slave_errno, /* ok to re-use error code */
			"%s. Failed executing load from '%s'", 
			tmp, fname);
      my_free(tmp,MYF(0));
    }
    goto err;
  }
  /*
    We have an open file descriptor to the .info file; we need to close it
    or Windows will refuse to delete the file in my_delete().
  */
  if (fd >= 0)
  {
    my_close(fd, MYF(0));
    end_io_cache(&file);
    fd= -1;
  }
  (void) my_delete(fname, MYF(MY_WME));
  memcpy(p, ".data", 6);
  (void) my_delete(fname, MYF(MY_WME));
  error = 0;

err:
  delete lev;
  if (fd >= 0)
  {
    my_close(fd, MYF(0));
    end_io_cache(&file);
  }
  return error ? error : Log_event::exec_event(rli);
}

#endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */


/**************************************************************************
	sql_ex_info methods
**************************************************************************/

/*
  sql_ex_info::write_data()
*/

int sql_ex_info::write_data(IO_CACHE* file)
{
  if (new_format())
  {
    return (write_str(file, field_term, field_term_len) ||
	    write_str(file, enclosed,   enclosed_len) ||
	    write_str(file, line_term,  line_term_len) ||
	    write_str(file, line_start, line_start_len) ||
	    write_str(file, escaped,    escaped_len) ||
	    my_b_safe_write(file,(byte*) &opt_flags,1));
  }
  else
  {
    old_sql_ex old_ex;
    old_ex.field_term= *field_term;
    old_ex.enclosed=   *enclosed;
    old_ex.line_term=  *line_term;
    old_ex.line_start= *line_start;
    old_ex.escaped=    *escaped;
    old_ex.opt_flags=  opt_flags;
    old_ex.empty_flags=empty_flags;
    return my_b_safe_write(file, (byte*) &old_ex, sizeof(old_ex));
  }
}


/*
  sql_ex_info::init()
*/

char* sql_ex_info::init(char* buf,char* buf_end,bool use_new_format)
{
  cached_new_format = use_new_format;
  if (use_new_format)
  {
    empty_flags=0;
    /*
      The code below assumes that buf will not disappear from
      under our feet during the lifetime of the event. This assumption
      holds true in the slave thread if the log is in new format, but is not
      the case when we have old format because we will be reusing net buffer
      to read the actual file before we write out the Create_file event.
    */
    if (read_str(buf, buf_end, field_term, field_term_len) ||
	read_str(buf, buf_end, enclosed,   enclosed_len) ||
	read_str(buf, buf_end, line_term,  line_term_len) ||
	read_str(buf, buf_end, line_start, line_start_len) ||
	read_str(buf, buf_end, escaped,	   escaped_len))
      return 0;
    opt_flags = *buf++;
  }
  else
  {
    field_term_len= enclosed_len= line_term_len= line_start_len= escaped_len=1;
    field_term = buf++;			// Use first byte in string
    enclosed=	 buf++;
    line_term=   buf++;
    line_start=  buf++;
    escaped=     buf++;
    opt_flags =  *buf++;
    empty_flags= *buf++;
    if (empty_flags & FIELD_TERM_EMPTY)
      field_term_len=0;
    if (empty_flags & ENCLOSED_EMPTY)
      enclosed_len=0;
    if (empty_flags & LINE_TERM_EMPTY)
      line_term_len=0;
    if (empty_flags & LINE_START_EMPTY)
      line_start_len=0;
    if (empty_flags & ESCAPED_EMPTY)
      escaped_len=0;
  }
  return buf;
}
