log_event.cc

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 __GNUC__
#pragma implementation				// gcc: Class implementation
#endif
#include  "mysql_priv.h"
#include "slave.h"
#include <my_dir.h>
#endif /* MYSQL_CLIENT */

#include <assert.h>

inline int my_b_safe_write(IO_CACHE* file, const byte *buf,
			   int len)
{
  /*
    Sasha: We are not writing this with the ? operator to avoid hitting
    a possible compiler bug. At least gcc 2.95 cannot deal with 
    several layers of ternary operators that evaluated comma(,) operator
    expressions inside - I do have a test case if somebody wants it
  */
  if (file->type == SEQ_READ_APPEND)
    return my_b_append(file, buf,len);
  return my_b_write(file, buf,len);
}

#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

#ifndef MYSQL_CLIENT

inline int ignored_error_code(int err_code)
{
  return use_slave_mask && bitmap_is_set(&slave_error_mask, err_code);
}


static void pretty_print_str(String* packet, char* str, int len)
{
  char* end = str + len;
  packet->append('\'');
  while (str < end)
  {
    char c;
    switch ((c=*str++)) {
    case '\n': packet->append( "\\n"); break;
    case '\r': packet->append( "\\r"); break;
    case '\\': packet->append( "\\\\"); break;
    case '\b': packet->append( "\\b"); break;
    case '\t': packet->append( "\\t"); break;
    case '\'': packet->append( "\\'"); break;
    case 0   : packet->append( "\\0"); break;
    default:
      packet->append((char)c);
      break;
    }
  }
  packet->append('\'');
}


static inline char* slave_load_file_stem(char*buf, uint file_id,
					 int event_server_id)
{
  fn_format(buf,"SQL_LOAD-",slave_load_tmpdir,"",0); /* 4+32); */
  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

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";
  default: /* impossible */ return "Unknown";
  }
}

#ifndef MYSQL_CLIENT
Log_event::Log_event(THD* thd_arg, uint16 flags_arg)
  :exec_time(0), flags(flags_arg), cached_event_len(0),
   temp_buf(0), thd(thd_arg)
{
  if (thd)
  {
    server_id = thd->server_id;
    when = thd->start_time;
    log_pos = thd->log_pos;
  }
  else
  {
    server_id = ::server_id;
    when = time(NULL);
    log_pos=0;
  }
}

/*
  Delete all temporary files used for SQL_LOAD.

  TODO
  - When we get a 'server start' event, we should only remove
    the files associated with the server id that just started.
    Easily fixable by adding server_id as a prefix to the log files.
*/

static void cleanup_load_tmpdir()
{
  MY_DIR *dirp;
  FILEINFO *file;
  uint i;
  if (!(dirp=my_dir(slave_load_tmpdir,MYF(MY_WME))))
    return;

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

  my_dirend(dirp);
}

#endif

Log_event::Log_event(const char* buf, bool old_format)
  :cached_event_len(0), temp_buf(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

int Log_event::exec_event(struct st_relay_log_info* rli)
{
  if (rli)					// QQ When is this not true ?
  {
    rli->inc_pos(get_event_len(),log_pos);
    DBUG_ASSERT(rli->sql_thd != 0);
    flush_relay_log_info(rli);
  }
  return 0;
}

void Log_event::pack_info(String* packet)
{
  net_store_data(packet, "", 0);
}

void Query_log_event::pack_info(String* packet)
{
  char buf[256];
  String tmp(buf, sizeof(buf), system_charset_info);
  tmp.length(0);
  if (db && db_len)
  {
   tmp.append("use `", 5);
   tmp.append(db, db_len);
   tmp.append("`; ", 3);
  }

  if (query && q_len)
    tmp.append(query, q_len);
  net_store_data(packet, (char*)tmp.ptr(), tmp.length());
}

void Start_log_event::pack_info(String* packet)
{
  char buf1[256];
  String tmp(buf1, sizeof(buf1), system_charset_info);
  tmp.length(0);
  char buf[22];

  tmp.append("Server ver: ");
  tmp.append(server_version);
  tmp.append(", Binlog ver: ");
  tmp.append(llstr(binlog_version, buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Load_log_event::pack_info(String* packet)
{
  char buf[256];
  String tmp(buf, sizeof(buf), system_charset_info);
  tmp.length(0);
  if (db && db_len)
  {
   tmp.append("use ");
   tmp.append(db, db_len);
   tmp.append("; ", 2);
  }

  tmp.append("LOAD DATA INFILE '");
  tmp.append(fname, fname_len);
  tmp.append("' ", 2);
  if (sql_ex.opt_flags && REPLACE_FLAG )
    tmp.append(" REPLACE ");
  else if (sql_ex.opt_flags && IGNORE_FLAG )
    tmp.append(" IGNORE ");
  
  tmp.append("INTO TABLE ");
  tmp.append(table_name);
  if (sql_ex.field_term_len)
  {
    tmp.append(" FIELDS TERMINATED BY ");
    pretty_print_str(&tmp, sql_ex.field_term, sql_ex.field_term_len);
  }

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

  if (sql_ex.line_start_len)
  {
    tmp.append(" LINES STARTING BY ");
    pretty_print_str(&tmp, sql_ex.line_start, sql_ex.line_start_len);
  }
     
  if ((int)skip_lines > 0)
    tmp.append( " IGNORE %ld LINES ", (long) skip_lines);

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

  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Rotate_log_event::pack_info(String* packet)
{
  char buf1[256], buf[22];
  String tmp(buf1, sizeof(buf1), system_charset_info);
  tmp.length(0);
  tmp.append(new_log_ident, ident_len);
  tmp.append(";pos=");
  tmp.append(llstr(pos,buf));
  if (flags & LOG_EVENT_FORCED_ROTATE_F)
    tmp.append("; forced by master");
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Intvar_log_event::pack_info(String* packet)
{
  char buf1[256], buf[22];
  String tmp(buf1, sizeof(buf1), system_charset_info);
  tmp.length(0);
  tmp.append(get_var_type_name());
  tmp.append('=');
  tmp.append(llstr(val, buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}

void Slave_log_event::pack_info(String* packet)
{
  char buf1[256], buf[22], *end;
  String tmp(buf1, sizeof(buf1), system_charset_info);
  tmp.length(0);
  tmp.append("host=");
  tmp.append(master_host);
  tmp.append(",port=");
  end= int10_to_str((long) master_port, buf, 10);
  tmp.append(buf, (uint32) (end-buf));
  tmp.append(",log=");
  tmp.append(master_log);
  tmp.append(",pos=");
  tmp.append(llstr(master_pos,buf));
  net_store_data(packet, tmp.ptr(), tmp.length());
}


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_empty_string("Pos", 20));
  field_list->push_back(new Item_empty_string("Event_type", 20));
  field_list->push_back(new Item_empty_string("Server_id", 20));
  field_list->push_back(new Item_empty_string("Orig_log_pos", 20));
  field_list->push_back(new Item_empty_string("Info", 20));
}

int Log_event::net_send(THD* thd, const char* log_name, my_off_t pos)
{
  String* packet = &thd->packet;
  const char* p = strrchr(log_name, FN_LIBCHAR);
  const char* event_type;
  if (p)
    log_name = p + 1;
  
  packet->length(0);
  net_store_data(packet, log_name, strlen(log_name));
  net_store_data(packet, (longlong) pos);
  event_type = get_type_str();
  net_store_data(packet, event_type, strlen(event_type));
  net_store_data(packet, server_id);
  net_store_data(packet, (longlong) log_pos);
  pack_info(packet);
  return my_net_write(&thd->net, (char*) packet->ptr(), packet->length());
}

#endif /* MYSQL_CLIENT */


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


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


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)));
}

#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
#endif

// 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));
  }
  return res;
}


Log_event* Log_event::read_log_event(const char* buf, int event_len,
				     const char **error, bool old_format)
{
  if (event_len < EVENT_LEN_OFFSET ||
      (uint) event_len != uint4korr(buf+EVENT_LEN_OFFSET))
  {
    *error="Sanity check failed";		// Needed to free buffer
    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;
  case SLAVE_EVENT:
    ev = new Slave_log_event(buf, event_len);
    break;
  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;
  case STOP_EVENT:
    ev = new Stop_log_event(buf, old_format);
    break;
  case INTVAR_EVENT:
    ev = new Intvar_log_event(buf, old_format);
    break;
  default:
    break;
  }
  if (!ev || !ev->is_valid())
  {
    *error= "Found invalid event in binary log";
    delete ev;
    return 0;
  }
  ev->cached_event_len = event_len;
  return ev;  
}


#ifdef MYSQL_CLIENT
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)); 
}

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);
}


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, (time_t*)&created);
  fputc('\n', file);
  fflush(file);
}

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);
}

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));
  if (flags & LOG_EVENT_FORCED_ROTATE_F)
    fprintf(file,"  forced by master");
  fputc('\n', file);
  fflush(file);
}

#endif /* #ifdef MYSQL_CLIENT */


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);
}

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);
}


Rotate_log_event::Rotate_log_event(const char* buf, int event_len,
				   bool old_format)
  :Log_event(buf, old_format),new_log_ident(NULL),alloced(0)
{
  // 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;
  if (event_len < header_size)
    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);
  if (!(new_log_ident= my_strdup_with_length((byte*) buf +
					     ident_offset,
					     (uint) ident_len,
					     MYF(MY_WME))))
    return;
  alloced = 1;
}


int Rotate_log_event::write_data(IO_CACHE* file)
{
  char buf[ROTATE_HEADER_LEN];
  int8store(buf, pos + R_POS_OFFSET);
  return (my_b_safe_write(file, (byte*)buf, ROTATE_HEADER_LEN) ||
	  my_b_safe_write(file, (byte*)new_log_ident, (uint) ident_len));
}


#ifndef MYSQL_CLIENT
Query_log_event::Query_log_event(THD* thd_arg, const char* query_arg,
				 ulong query_length, bool using_trans)
  :Log_event(thd_arg), data_buf(0), query(query_arg),  db(thd_arg->db),
  q_len((uint32) query_length),
  error_code(thd_arg->killed ? ER_SERVER_SHUTDOWN: thd_arg->net.last_errno),
  thread_id(thd_arg->thread_id),
  cache_stmt(using_trans &&
	     (thd_arg->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
{
  time_t end_time;
  time(&end_time);
  exec_time = (ulong) (end_time  - thd->start_time);
  db_len = (db) ? (uint32) strlen(db) : 0;
}
#endif

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);
  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;
}


#ifdef MYSQL_CLIENT

void Query_log_event::print(FILE* file, bool short_form, char* last_db)
{
  char buff[40],*end;				// Enough for SET TIMESTAMP
  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 same_db = 0;

  if (db && last_db)
  {
    if (!(same_db = !memcmp(last_db, db, db_len + 1)))
      memcpy(last_db, db, db_len + 1);
  }
  
  if (db && db[0] && !same_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));
  my_fwrite(file, (byte*) query, q_len, MYF(MY_NABP | MY_WME));
  fprintf(file, ";\n");
}
#endif


int Query_log_event::write_data(IO_CACHE* file)
{
  if (!query)
    return -1;
  
  char buf[QUERY_HEADER_LEN]; 
  int4store(buf + Q_THREAD_ID_OFFSET, thread_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;
}

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);
}

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";
  }
}

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));
}

#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


int Load_log_event::write_data_header(IO_CACHE* file)
{
  char buf[LOAD_HEADER_LEN];
  int4store(buf + L_THREAD_ID_OFFSET, thread_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);
}

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));
}



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));
}


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));
  }
}


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;
}


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;
}


#ifndef MYSQL_CLIENT
Load_log_event::Load_log_event(THD* thd, sql_exchange* ex,
			       const char* db_arg, const char* table_name_arg,
			       List<Item>& fields_arg,
			       enum enum_duplicates handle_dup)
  :Log_event(thd),thread_id(thd->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)
{
  time_t end_time;
  time(&end_time);
  exec_time = (ulong) (end_time  - thd->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_IGNORE: sql_ex.opt_flags |= IGNORE_FLAG; break;
  case DUP_REPLACE: sql_ex.opt_flags |= REPLACE_FLAG; break;
  case DUP_ERROR: break;	
  }

  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

/*
  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)
{
  if (!event_len) // derived class, will call copy_log_event() itself
    return;
  copy_log_event(buf, event_len, old_format);
}

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;
  const char* data_head = buf + ((old_format) ?
				 OLD_HEADER_LEN : LOG_EVENT_HEADER_LEN);
  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 + OLD_HEADER_LEN :
		     get_data_body_offset());
  
  if ((int) event_len < body_offset)
    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)))
    return 1;
  
  data_len = event_len - body_offset;
  if (num_fields > data_len) // simple sanity check against corruption
    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
  return 0;
}

#ifdef MYSQL_CLIENT

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

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

  fprintf(file, "LOAD DATA 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);
  if (sql_ex.field_term)
  {
    fprintf(file, " FIELDS TERMINATED BY ");
    pretty_print_str(file, sql_ex.field_term, sql_ex.field_term_len);
  }

  if (sql_ex.enclosed)
  {
    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);
  }
     
  if (sql_ex.escaped)
  {
    fprintf(file, " ESCAPED BY ");
    pretty_print_str(file, sql_ex.escaped, sql_ex.escaped_len);
  }
     
  if (sql_ex.line_term)
  {
    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," LINES STARTING BY ");
    pretty_print_str(file, sql_ex.line_start, sql_ex.line_start_len);
  }
     
  if ((int)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");
}

#endif /* #ifdef MYSQL_CLIENT */

#ifndef MYSQL_CLIENT

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


void Load_log_event::set_fields(List<Item> &fields)
{
  uint i;
  const char* field = this->fields;
  for (i = 0; i < num_fields; i++)
  {
    fields.push_back(new Item_field(db, table_name, field));	  
    field += field_lens[i]  + 1;
  }
}


Slave_log_event::Slave_log_event(THD* thd_arg,
				 struct st_relay_log_info* rli):
  Log_event(thd_arg),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->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->master_log_name, master_log_len + 1);
    master_port = mi->port;
    master_pos = rli->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
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,
			char* block_arg, uint block_len_arg)
  :Load_log_event(thd_arg,ex,db_arg,table_name_arg,fields_arg,handle_dup),
   fake_base(0),block(block_arg),block_len(block_len_arg),
   file_id(thd_arg->file_id = mysql_bin_log.next_file_id())
{
  sql_ex.force_new_format();
}
#endif

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));
}

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);
}

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::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;
  if (copy_log_event(buf,len,old_format))
    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;
  }
}


#ifdef MYSQL_CLIENT
void Create_file_log_event::print(FILE* file, bool short_form,
				  char* last_db)
{
  if (short_form)
    return;
  Load_log_event::print(file, 1, last_db);
  fprintf(file, " file_id: %d  block_len: %d\n", file_id, block_len);
}
#endif

#ifndef MYSQL_CLIENT
void Create_file_log_event::pack_info(String* packet)
{
  char buf1[256],buf[22], *end;
  String tmp(buf1, sizeof(buf1), system_charset_info);
  tmp.length(0);
  tmp.append("db=");
  tmp.append(db, db_len);
  tmp.append(";table=");
  tmp.append(table_name, table_name_len);
  tmp.append(";file_id=");
  end= int10_to_str((long) file_id, buf, 10);
  tmp.append(buf, (uint32) (end-buf));
  tmp.append(";block_len=");
  end= int10_to_str((long) block_len, buf, 10);
  tmp.append(buf, (uint32) (end-buf));
  net_store_data(packet, (char*) tmp.ptr(), tmp.length());
}
#endif  

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

  
Append_block_log_event::Append_block_log_event(const char* buf, int len)
  :Log_event(buf, 0),block(0)
{
  if ((uint)len < APPEND_BLOCK_EVENT_OVERHEAD)
    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;
}

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));
}

#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  

#ifndef MYSQL_CLIENT
void Append_block_log_event::pack_info(String* packet)
{
  char buf[256];
  uint length;
  length= (uint) my_sprintf(buf,
			    (buf, ";file_id=%u;block_len=%u", file_id,
			     block_len));
  net_store_data(packet, buf, (int32) length);
}


Delete_file_log_event::Delete_file_log_event(THD* thd_arg)
  :Log_event(thd_arg),file_id(thd_arg->file_id)
{
}
#endif


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);
}


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);
}

#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

#ifndef MYSQL_CLIENT
void Delete_file_log_event::pack_info(String* packet)
{
  char buf[64];
  uint length;
  length= (uint) my_sprintf(buf, (buf, ";file_id=%u", (uint) file_id));
  net_store_data(packet, buf, (int32) length);
}
#endif  


#ifndef MYSQL_CLIENT  
Execute_load_log_event::Execute_load_log_event(THD* thd_arg)
  :Log_event(thd_arg),file_id(thd_arg->file_id)
{
}
#endif  
  

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);
}


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);
}

#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  
#ifndef MYSQL_CLIENT
void Execute_load_log_event::pack_info(String* packet)
{
  char buf[64];
  uint length;
  length= (uint) my_sprintf(buf, (buf, ";file_id=%u", (uint) file_id));
  net_store_data(packet, buf, (int32) length);
}
#endif

#ifndef MYSQL_CLIENT
int Query_log_event::exec_event(struct st_relay_log_info* rli)
{
  int expected_error,actual_error = 0;
  init_sql_alloc(&thd->mem_root, 8192,0);
  thd->db = rewrite_db((char*)db);

  /*
    InnoDB internally stores the master log position it has processed so far;
    position to store is really pos + pending + event_len
    since we must store the pos of the END of the current log event
  */
  rli->event_len= get_event_len();

  if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->query = (char*)query;
    thd->set_time((time_t)when);
    thd->current_tablenr = 0;
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    thd->query_error = 0;			// clear error
    thd->net.last_errno = 0;
    thd->net.last_error[0] = 0;
    thd->slave_proxy_id = thread_id;		// for temp tables
	
    /*
      Sanity check to make sure the master did not get a really bad
      error on the query.
    */
    if (ignored_error_code((expected_error = error_code)) ||
	!check_expected_error(thd,rli,expected_error))
    {
      mysql_log.write(thd,COM_QUERY,"%s",thd->query);
      DBUG_PRINT("query",("%s",thd->query));
      mysql_parse(thd, thd->query, q_len);
      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))
      {
	const char* errmsg = "Slave: did not get the expected error\
 running query from master - expected: '%s' (%d), got '%s' (%d)"; 
	sql_print_error(errmsg, ER_SAFE(expected_error),
			expected_error,
			actual_error ? thd->net.last_error: "no error",
			actual_error);
	thd->query_error = 1;
      }
      else if (expected_error == actual_error ||
	       ignored_error_code(actual_error))
      {
	DBUG_PRINT("info",("error ignored"));
	thd->query_error = 0;
	*rli->last_slave_error = 0;
	rli->last_slave_errno = 0;
      }
    }
    else
    {
      // master could be inconsistent, abort and tell DBA to check/fix it
      thd->db = thd->query = 0;
      thd->variables.convert_set = 0;
      close_thread_tables(thd);
      free_root(&thd->mem_root,0);
      return 1;
    }
  }
  thd->db= 0;				// prevent db from being freed
  thd->query= 0;			// just to be sure
  // assume no convert for next query unless set explictly
  thd->variables.convert_set = 0;
  close_thread_tables(thd);
      
  if (thd->query_error || thd->fatal_error)
  {
    slave_print_error(rli,actual_error, "error '%s' on query '%s'",
		      actual_error ? thd->net.last_error :
		      "unexpected success or fatal error", query);
    free_root(&thd->mem_root,0);
    return 1;
  }
  free_root(&thd->mem_root,0);
  return Log_event::exec_event(rli); 
}


int Load_log_event::exec_event(NET* net, struct st_relay_log_info* rli)
{
  init_sql_alloc(&thd->mem_root, 8192,0);
  thd->db = rewrite_db((char*)db);
  thd->query = 0;
  thd->query_error = 0;
	    
  if (db_ok(thd->db, replicate_do_db, replicate_ignore_db))
  {
    thd->set_time((time_t)when);
    thd->current_tablenr = 0;
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    thd->query_id = query_id++;
    VOID(pthread_mutex_unlock(&LOCK_thread_count));

    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;
    // 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 = DUP_IGNORE;
      if (sql_ex.opt_flags && REPLACE_FLAG)
	handle_dup = DUP_REPLACE;
      sql_exchange ex((char*)fname, sql_ex.opt_flags &&
		      DUMPFILE_FLAG );
      String field_term(sql_ex.field_term,sql_ex.field_term_len,
			system_charset_info);
      String enclosed(sql_ex.enclosed,sql_ex.enclosed_len,
		      system_charset_info);
      String line_term(sql_ex.line_term,sql_ex.line_term_len,
		       system_charset_info);
      String line_start(sql_ex.line_start,sql_ex.line_start_len,
			system_charset_info);
      String escaped(sql_ex.escaped,sql_ex.escaped_len, system_charset_info);

      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> fields;
      set_fields(fields);
      thd->slave_proxy_id = thd->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, fields, handle_dup, net != 0,
		     TL_WRITE))
	thd->query_error = 1;
      if (thd->cuted_fields)
	sql_print_error("Slave: load data infile at position %s in log \
'%s' produced %d warning(s)", llstr(rli->master_log_pos,llbuff), RPL_LOG_NAME,
			thd->cuted_fields );
      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; 
  thd->db= 0;					// prevent db from being freed
  close_thread_tables(thd);
  if (thd->query_error)
  {
    int sql_error = thd->net.last_errno;
    if (!sql_error)
      sql_error = ER_UNKNOWN_ERROR;
		
    slave_print_error(rli,sql_error,
		      "Slave: Error '%s' running load data infile ",
		      ER_SAFE(sql_error));
    free_root(&thd->mem_root,0);
    return 1;
  }
  free_root(&thd->mem_root,0);
	    
  if (thd->fatal_error)
  {
    sql_print_error("Slave: Fatal error running LOAD DATA INFILE ");
    return 1;
  }

  return Log_event::exec_event(rli); 
}


/*
  The master started

  IMPLEMENTATION
    - To handle the case where the master died without a stop event,
      we clean up all temporary tables + locks that we got.

  TODO
    - Remove all active user locks
    - If we have an active transaction at this point, the master died
      in the middle while writing the transaction to the binary log.
      In this case we should stop the slave.
*/

int Start_log_event::exec_event(struct st_relay_log_info* rli)
{
  /* All temporary tables was deleted on the master */
  close_temporary_tables(thd);
  /*
    If we have old format, load_tmpdir is cleaned up by the I/O thread
  */
  if (!rli->mi->old_format)
    cleanup_load_tmpdir();
  return Log_event::exec_event(rli);
}


/*
  The master stopped. Clean up all temporary tables + locks that the
  master may have set.

  TODO
    - Remove all active user locks
*/

int Stop_log_event::exec_event(struct st_relay_log_info* rli)
{
  // do not clean up immediately after rotate event
  if (rli->master_log_pos > BIN_LOG_HEADER_SIZE) 
  {
    close_temporary_tables(thd);
    cleanup_load_tmpdir();
  }
  /*
    We do not want to update master_log pos because we get a rotate event
    before stop, so by now 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_pos(get_event_len(), 0);  
  flush_relay_log_info(rli);
  return 0;
}


/*
  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
 */
  

int Rotate_log_event::exec_event(struct st_relay_log_info* rli)
{
  char* log_name = rli->master_log_name;
  DBUG_ENTER("Rotate_log_event::exec_event");

  pthread_mutex_lock(&rli->data_lock);
  memcpy(log_name, new_log_ident, ident_len+1);
  rli->master_log_pos = pos;
  rli->relay_log_pos += get_event_len();
  DBUG_PRINT("info", ("master_log_pos: %d", (ulong) rli->master_log_pos));
  pthread_mutex_unlock(&rli->data_lock);
  pthread_cond_broadcast(&rli->data_cond);
  flush_relay_log_info(rli);
  DBUG_RETURN(0);
}


int Intvar_log_event::exec_event(struct st_relay_log_info* rli)
{
  switch (type) {
  case LAST_INSERT_ID_EVENT:
    thd->last_insert_id_used = 1;
    thd->last_insert_id = val;
    break;
  case INSERT_ID_EVENT:
    thd->next_insert_id = val;
    break;
  }
  rli->inc_pending(get_event_len());
  return 0;
}

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);
}

int Create_file_log_event::exec_event(struct st_relay_log_info* rli)
{
  char fname_buf[FN_REFLEN+10];
  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
  if ((fd = my_open(fname_buf, O_WRONLY|O_CREAT|O_BINARY|O_TRUNC,
		    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, "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, "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
  if ((fd = my_open(fname_buf, O_WRONLY|O_CREAT|O_BINARY|O_TRUNC,
		    MYF(MY_WME))) < 0)
  {
    slave_print_error(rli,my_errno, "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, "Write to '%s' failed", fname_buf);
    goto err;
  }
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  error=0;					// Everything is ok

err:
  if (error)
    end_io_cache(&file);
  if (fd >= 0)
    my_close(fd, MYF(0));
  return error ? 1 : Log_event::exec_event(rli);
}

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));
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  return Log_event::exec_event(rli);
}

int Append_block_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;

  memcpy(p, ".data", 6);
  if ((fd = my_open(fname, O_WRONLY|O_APPEND|O_BINARY, MYF(MY_WME))) < 0)
  {
    slave_print_error(rli,my_errno, "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, "Write to '%s' failed", fname);
    goto err;
  }
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  error=0;

err:
  if (fd >= 0)
    my_close(fd, MYF(0));
  return error ? error : Log_event::exec_event(rli);
}

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;
  ulong save_options;
  IO_CACHE file;
  Load_log_event* lev = 0;

  memcpy(p, ".info", 6);
  if ((fd = my_open(fname, O_RDONLY|O_BINARY, 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, "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, "File '%s' appears corrupted", fname);
    goto err;
  }
  /*
    We want to disable binary logging in slave thread because we need the file
    events to appear in the same order as they do on the master relative to
    other events, so that we can preserve ascending order of log sequence
    numbers - needed to handle failover .
  */
  save_options = thd->options;
  thd->options &= ~ (ulong) (OPTION_BIN_LOG);
  lev->thd = thd;
  if (lev->exec_event(0,0))
  {
    slave_print_error(rli,my_errno, "Failed executing load from '%s'", fname);
    thd->options = save_options;
    goto err;
  }
  thd->options = save_options;
  (void) my_delete(fname, MYF(MY_WME));
  memcpy(p, ".data", 6);
  (void) my_delete(fname, MYF(MY_WME));
  if (mysql_bin_log.is_open())
    mysql_bin_log.write(this);
  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 /* !MYSQL_CLIENT */