added SHOW BINLOG EVENTS

fixed log sequence bugs
fixed bugs in handling Slave event
added test case with SHOW BINLOG EVENTS
have not fixed all the bugs - found some that are also in 3.23,
will fix them there first, then do pull and cleanup

will not push this changeset


include/mysqld_error.h:
  new error
mysql-test/mysql-test-run.sh:
  use quotes in expr
sql/lex.h:
  SHOW BINLOG EVENTS
sql/log.cc:
  fixed log sequence bugs
sql/log_event.cc:
  SHOW BINLOG EVENTS
  fixed bugs Slave event handling
sql/log_event.h:
  SHOW BINLOG EVENTS
sql/share/english/errmsg.txt:
  SHOW BINLOG EVENTS
sql/sql_lex.h:
  SHOW BINLOG EVENTS
sql/sql_parse.cc:
  SHOW BINLOG EVENTS
sql/sql_repl.cc:
  SHOW BINLOG EVENTS
sql/sql_repl.h:
  SHOW BINLOG EVENTS
sql/sql_yacc.yy:
  SHOW BINLOG EVENTS

include/mysqld_error.h

@@ -210,4 +210,5 @@
 #define ER_READ_ONLY_TRANSACTION 1207
 #define ER_CONNECT_TO_MASTER 1208
 #define ER_QUERY_ON_MASTER 1209
-#define ER_ERROR_MESSAGES 210
+#define ER_SHOW_BINLOG_EVENTS 1210
+#define ER_ERROR_MESSAGES 211

mysql-test/mysql-test-run.sh

@@ -659,7 +659,7 @@ run_testcase ()
  slave_master_info_file=$TESTDIR/$tname-slave-master-info.opt
  SKIP_SLAVE=`$EXPR \( $tname : rpl \) = 0`
  if [ -n $SKIP_TEST ] ; then 
-   SKIP_THIS_TEST=`$EXPR \( $tname : $SKIP_TEST \) != 0`
+   SKIP_THIS_TEST=`$EXPR \( $tname : '$SKIP_TEST' \) != 0`
    if [ x$SKIP_THIS_TEST = x1 ] ;
    then
     return;

mysql-test/r/rpl_log.result

+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.001	4	Start	1	1	Server ver: 4.0.0-debug-log, Binlog ver: 2
+master-bin.001	79	Query	1	2	use test; create table t1(n int not null auto_increment primary key)
+master-bin.001	172	Intvar	1	3	INSERT_ID=1
+master-bin.001	200	Query	1	4	use test; insert into t1 values (NULL)
+master-bin.001	263	Query	1	5	use test; drop table t1
+master-bin.001	311	Query	1	6	use test; create table t1 (word char(20) not null)
+master-bin.001	386	Load	1	7	use test; LOAD DATA INFILE '../../std_data/words.dat' INTO TABLE t1 FIELDS TERMINATED BY '\t' ESCAPED BY '\\' LINES TERMINATED BY '\n' (word)
+master-bin.001	468	Query	1	8	use test; drop table t1
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.001	79	Query	1	2	use test; create table t1(n int not null auto_increment primary key)
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.001	79	Query	1	2	use test; create table t1(n int not null auto_increment primary key)
+master-bin.001	172	Intvar	1	3	INSERT_ID=1
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.001	200	Query	1	4	use test; insert into t1 values (NULL)
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.001	4	Start	1	1	Server ver: 4.0.0-debug-log, Binlog ver: 2
+master-bin.001	79	Query	1	2	use test; create table t1(n int not null auto_increment primary key)
+master-bin.001	172	Intvar	1	3	INSERT_ID=1
+master-bin.001	200	Query	1	4	use test; insert into t1 values (NULL)
+master-bin.001	263	Query	1	5	use test; drop table t1
+master-bin.001	311	Query	1	6	use test; create table t1 (word char(20) not null)
+master-bin.001	386	Load	1	7	use test; LOAD DATA INFILE '../../std_data/words.dat' INTO TABLE t1 FIELDS TERMINATED BY '\t' ESCAPED BY '\\' LINES TERMINATED BY '\n' (word)
+master-bin.001	468	Query	1	8	use test; drop table t1
+master-bin.001	516	Rotate	1	9	master-bin.002
+master-bin.001	549	Stop	1	10	
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+master-bin.002	4	Start	1	1	Server ver: 4.0.0-debug-log, Binlog ver: 2
+Log_name
+slave-bin.001
+slave-bin.002
+slave-bin.003
+slave-bin.004
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+slave-bin.001	4	Start	2	1	Server ver: 4.0.0-debug-log, Binlog ver: 2
+slave-bin.001	79	Slave	2	2	
+slave-bin.001	118	Rotate	2	3	slave-bin.002
+slave-bin.001	150	Stop	2	4	
+Log_name	Pos	Event_type	Server_id	Log_seq	Info
+slave-bin.002	4	Start	2	1	Server ver: 4.0.0-debug-log, Binlog ver: 2
+slave-bin.002	79	Slave	1	2	
+slave-bin.002	132	Slave	1	3	
+slave-bin.002	185	Query	1	4	use test; create table t1(n int not null auto_increment primary key)
+slave-bin.002	278	Intvar	2	5	INSERT_ID=1
+slave-bin.002	306	Query	1	6	use test; insert into t1 values (NULL)
+slave-bin.002	369	Query	1	7	use test; drop table t1
+slave-bin.002	417	Query	1	8	use test; create table t1 (word char(20) not null)
+slave-bin.002	492	Query	1	9	use test; drop table t1
+slave-bin.002	540	Rotate	2	10	slave-bin.003
+slave-bin.002	572	Stop	2	11	

mysql-test/t/rpl_log.test

+source include/master-slave.inc;
+
+#clean up slave binlogs
+connection slave;
+reset master;
+
+connection master;
+drop table if exists t1;
+create table t1(n int not null auto_increment primary key);
+insert into t1 values (NULL);
+drop table t1;
+create table t1 (word char(20) not null);
+load data infile '../../std_data/words.dat' into table t1;
+drop table t1;
+show binlog events;
+show binlog events from 79 limit 1;
+show binlog events from 79 limit 2;
+show binlog events from 79 limit 2,1;
+flush logs;
+show binlog events;
+show binlog events in 'master-bin.002';
+save_master_pos;
+connection slave;
+sync_with_master;
+show master logs;
+show binlog events in 'slave-bin.001' from 4;
+show binlog events in 'slave-bin.002' from 4;

sql/lex.h

@@ -70,6 +70,7 @@ static SYMBOL symbols[] = {
   { "BIGINT",		SYM(BIGINT),0,0},
   { "BIT",		SYM(BIT_SYM),0,0},
   { "BINARY",		SYM(BINARY),0,0},
+  { "BINLOG",		SYM(BINLOG_SYM),0,0},
   { "BLOB",		SYM(BLOB_SYM),0,0},
   { "BOOL",		SYM(BOOL_SYM),0,0},
   { "BOTH",		SYM(BOTH),0,0},
@@ -128,6 +129,7 @@ static SYMBOL symbols[] = {
   { "ENABLE",		SYM(ENABLE_SYM),0,0},
   { "ENCLOSED",		SYM(ENCLOSED),0,0},
   { "ENUM",		SYM(ENUM),0,0},
+  { "EVENTS",		SYM(EVENTS_SYM),0,0},
   { "EXPLAIN",		SYM(DESCRIBE),0,0},
   { "EXISTS",		SYM(EXISTS),0,0},
   { "EXTENDED",		SYM(EXTENDED_SYM),0,0},

sql/log.cc

@@ -230,6 +230,8 @@ void MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
     if ((do_magic && my_b_write(&log_file, (byte*) BINLOG_MAGIC, 4)) ||
 	open_index(O_APPEND | O_RDWR | O_CREAT))
       goto err;
+
+    log_seq = 1;
     Start_log_event s;
     bool error;
     s.set_log_seq(0, this);
@@ -240,11 +242,13 @@ void MYSQL_LOG::open(const char *log_name, enum_log_type log_type_arg,
     {
       THD* thd = current_thd;
       Slave_log_event s(thd, &glob_mi);
-      s.set_log_seq(thd, this);
 	
       if(s.master_host)
+      {
+        s.set_log_seq(thd, this);
 	s.write(&log_file);
       }
+    }
 
     flush_io_cache(&log_file);
     pthread_mutex_lock(&LOCK_index);
@@ -553,7 +557,6 @@ void MYSQL_LOG::new_file()
     open(old_name, log_type, new_name);
     my_free(old_name,MYF(0));
     last_time=query_start=0;
-    log_seq = 1;
     write_error=0;
     VOID(pthread_mutex_unlock(&LOCK_log));
   }
@@ -666,8 +669,12 @@ bool MYSQL_LOG::write(Query_log_event* event_info)
   if (is_open())
   {
     THD *thd=event_info->thd;
+#ifdef USING_TRANSACTIONS    
     IO_CACHE *file = (event_info->cache_stmt ? &thd->transaction.trans_log :
 		      &log_file);
+#else
+    IO_CACHE *file = &log_file;
+#endif    
     if ((!(thd->options & OPTION_BIN_LOG) &&
 	 (thd->master_access & PROCESS_ACL)) ||
 	!db_ok(event_info->db, binlog_do_db, binlog_ignore_db))
@@ -680,12 +687,14 @@ bool MYSQL_LOG::write(Query_log_event* event_info)
     if (thd->last_insert_id_used)
     {
       Intvar_log_event e((uchar)LAST_INSERT_ID_EVENT, thd->last_insert_id);
+      e.set_log_seq(thd, this);
       if (e.write(file))
 	goto err;
     }
     if (thd->insert_id_used)
     {
       Intvar_log_event e((uchar)INSERT_ID_EVENT, thd->last_insert_id);
+      e.set_log_seq(thd, this);
       if (e.write(file))
 	goto err;
     }
@@ -698,10 +707,12 @@ bool MYSQL_LOG::write(Query_log_event* event_info)
       // just in case somebody wants it later
       thd->query_length = (uint)(p - buf);
       Query_log_event e(thd, buf);
+      e.set_log_seq(thd, this);
       if (e.write(file))
 	goto err;
       thd->query_length = save_query_length; // clean up
     }
+    event_info->set_log_seq(thd, this);
     if (event_info->write(file) ||
 	file == &log_file && flush_io_cache(file))
       goto err;
@@ -796,6 +807,7 @@ bool MYSQL_LOG::write(Load_log_event* event_info)
       if ((thd->options & OPTION_BIN_LOG) ||
 	  !(thd->master_access & PROCESS_ACL))
       {
+	event_info->set_log_seq(thd, this);
 	if (event_info->write(&log_file) || flush_io_cache(&log_file))
 	{
 	  if (!write_error)
@@ -947,6 +959,7 @@ void MYSQL_LOG::close(bool exiting)
     if (log_type == LOG_BIN)
     {
       Stop_log_event s;
+      s.set_log_seq(0, this);
       s.write(&log_file);
       VOID(pthread_cond_broadcast(&COND_binlog_update));
     }

sql/log_event.cc

@@ -32,6 +32,7 @@ static void pretty_print_char(FILE* file, int c)
   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:
@@ -41,6 +42,203 @@ static void pretty_print_char(FILE* file, int c)
   fputc('\'', file);
 }
 
+#ifndef MYSQL_CLIENT
+
+static void pretty_print_char(String* packet, int c)
+{
+  packet->append('\'');
+  switch(c) {
+  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('\'');
+}
+
+#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 SLAVE_EVENT:  return "Slave";
+  default: /* impossible */ return "Unknown";
+  }
+}
+
+#ifndef MYSQL_CLIENT
+
+void Log_event::pack_info(String* packet)
+{
+  net_store_data(packet, "", 0);
+}
+
+void Query_log_event::pack_info(String* packet)
+{
+  String tmp;
+  if(db && db_len)
+  {
+   tmp.append("use ");
+   tmp.append(db, db_len);
+   tmp.append("; ", 2);
+  }
+
+  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)
+{
+  String tmp;
+  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)
+{
+  String tmp;
+  if(db && db_len)
+  {
+   tmp.append("use ");
+   tmp.append(db, db_len);
+   tmp.append("; ", 2);
+  }
+
+  tmp.append("LOAD DATA INFILE '");
+  tmp.append(fname);
+  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.empty_flags & FIELD_TERM_EMPTY))
+  {
+    tmp.append(" FIELDS TERMINATED BY ");
+    pretty_print_char(&tmp, sql_ex.field_term);
+  }
+
+  if (!(sql_ex.empty_flags & ENCLOSED_EMPTY))
+  {
+    if (sql_ex.opt_flags && OPT_ENCLOSED_FLAG )
+      tmp.append(" OPTIONALLY ");
+    tmp.append( " ENCLOSED BY ");
+    pretty_print_char(&tmp, sql_ex.enclosed);
+  }
+     
+  if (!(sql_ex.empty_flags & ESCAPED_EMPTY))
+  {
+    tmp.append( " ESCAPED BY ");
+    pretty_print_char(&tmp, sql_ex.escaped);
+  }
+     
+  if (!(sql_ex.empty_flags & LINE_TERM_EMPTY))
+  {
+    tmp.append(" LINES TERMINATED BY ");
+    pretty_print_char(&tmp, sql_ex.line_term);
+  }
+
+  if (!(sql_ex.empty_flags & LINE_START_EMPTY))
+  {
+    tmp.append(" LINES STARTING BY ");
+    pretty_print_char(&tmp, sql_ex.line_start);
+  }
+     
+  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)
+{
+  net_store_data(packet, new_log_ident, ident_len);
+}
+
+void Intvar_log_event::pack_info(String* packet)
+{
+  String tmp;
+  char buf[22];
+  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)
+{
+  net_store_data(packet, "", 0);
+}
+
+
+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("Log_seq", 20));
+  field_list->push_back(new Item_empty_string("Info", 20));
+}
+
+int Log_event::net_send(THD* thd, const char* log_name, ulong 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, log_seq);
+  pack_info(packet);
+  return my_net_write(&thd->net, (char*)packet->ptr(), packet->length());
+}
+
+#endif
+
 int Query_log_event::write(IO_CACHE* file)
 {
   return query ? Log_event::write(file) : -1; 
@@ -209,6 +407,17 @@ Log_event* Log_event::read_log_event(const char* buf, int event_len)
 
     return r;
   }
+  case SLAVE_EVENT:
+  {
+    Slave_log_event* s = new Slave_log_event(buf, event_len);
+    if (!s->master_host)
+    {
+      delete s;
+      return NULL;
+    }
+
+    return s;
+  }
   case START_EVENT:  return  new Start_log_event(buf);
   case STOP_EVENT:  return  new Stop_log_event(buf);
   case INTVAR_EVENT:  return  new Intvar_log_event(buf);
@@ -394,6 +603,16 @@ Intvar_log_event::Intvar_log_event(const char* buf):Log_event(buf)
   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];
@@ -616,8 +835,7 @@ Slave_log_event::Slave_log_event(THD* thd_arg,MASTER_INFO* mi):
   if((mem_pool = (char*)my_malloc(get_data_size() + 1,
 				  MYF(MY_WME))))
   {
-    master_host = mem_pool + sizeof(uint32) +
-      sizeof(ulonglong) + sizeof(uint16);
+    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, mi->log_file_name, master_log_len + 1);
@@ -653,19 +871,15 @@ void Slave_log_event::print(FILE* file, bool short_form = 0,
 
 int Slave_log_event::get_data_size()
 {
-  return master_host_len + master_log_len + 1 + 4 /* data_size*/ +
-    8 /* master_pos */ +
-    2 /* master_port */;
+  return master_host_len + master_log_len + 1 + SL_MASTER_HOST_OFFSET;
 }
 
 int Slave_log_event::write_data(IO_CACHE* file)
 {
-  int data_size = get_data_size();
-  int4store(mem_pool, data_size);
   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_write(file, (byte*)mem_pool, data_size);
+  return my_b_write(file, (byte*)mem_pool, get_data_size());
 }
 
 void Slave_log_event::init_from_mem_pool(int data_size)
@@ -694,8 +908,3 @@ Slave_log_event::Slave_log_event(const char* buf, int event_len):
   mem_pool[event_len] = 0;
   init_from_mem_pool(event_len);
 }
-
-
-
-
-

sql/log_event.h

@@ -71,9 +71,9 @@
 
 /* slave event post-header */
 
-#define SL_MASTER_PORT_OFFSET   12
-#define SL_MASTER_POS_OFFSET    4
-#define SL_MASTER_HOST_OFFSET   14
+#define SL_MASTER_PORT_OFFSET   8
+#define SL_MASTER_POS_OFFSET    0
+#define SL_MASTER_HOST_OFFSET   10
 
 /* query event post-header */
 
@@ -177,11 +177,15 @@ public:
   // if mutex is 0, the read will proceed without mutex
   static Log_event* read_log_event(IO_CACHE* file, pthread_mutex_t* log_lock);
   static Log_event* read_log_event(const char* buf, int event_len);
+  const char* get_type_str();
 
 #ifndef MYSQL_CLIENT
   static int read_log_event(IO_CACHE* file, String* packet,
 			    pthread_mutex_t* log_lock);
   void set_log_seq(THD* thd, MYSQL_LOG* log);
+  virtual void pack_info(String* packet);
+  int net_send(THD* thd, const char* log_name, ulong pos);
+  static void init_show_field_list(List<Item>* field_list);
 #endif
   
 };
@@ -217,6 +221,8 @@ public:
     exec_time = (ulong) (end_time  - thd->start_time);
     db_len = (db) ? (uint32) strlen(db) : 0;
   }
+  
+  void pack_info(String* packet);
 #endif
 
   Query_log_event(const char* buf, int event_len);
@@ -257,6 +263,7 @@ public:
 
 #ifndef MYSQL_CLIENT  
   Slave_log_event(THD* thd_arg, struct st_master_info* mi);
+  void pack_info(String* packet);
 #endif
   
   Slave_log_event(const char* buf, int event_len);
@@ -383,6 +390,7 @@ public:
     fields = fields_buf.ptr();
   }
   void set_fields(List<Item> &fields_arg);
+  void pack_info(String* packet);
 #endif
 
   Load_log_event(const char* buf, int event_len);
@@ -432,6 +440,9 @@ public:
   {
     return START_HEADER_LEN;
   }
+#ifndef MYSQL_CLIENT
+  void pack_info(String* packet);
+#endif  
   void print(FILE* file, bool short_form = 0, char* last_db = 0);
 };
 
@@ -446,8 +457,12 @@ public:
   Intvar_log_event(const char* buf);
   ~Intvar_log_event() {}
   Log_event_type get_type_code() { return INTVAR_EVENT;}
+  const char* get_var_type_name();
   int get_data_size() { return  sizeof(type) + sizeof(val);}
   int write_data(IO_CACHE* file);
+#ifndef MYSQL_CLIENT
+  void pack_info(String* packet);
+#endif  
   
   
   void print(FILE* file, bool short_form = 0, char* last_db = 0);
@@ -491,6 +506,12 @@ public:
   int write_data(IO_CACHE* file);
   
   void print(FILE* file, bool short_form = 0, char* last_db = 0);
+#ifndef MYSQL_CLIENT
+  void pack_info(String* packet);
+#endif  
 };
 
 #endif
+
+
+

sql/share/english/errmsg.txt

@@ -211,3 +211,5 @@
 "Update locks cannot be acquired during a READ UNCOMMITTED transaction",
 "Error connecting to master: %-.128s",
 "Error running query on master: %-.128s",
+"Error in SHOW BINLOG EVENTS: %-.128s",
+

sql/sql_lex.h

@@ -55,7 +55,8 @@ enum enum_sql_command {
   SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_SHOW_BINLOGS,
   SQLCOM_SHOW_OPEN_TABLES, SQLCOM_LOAD_MASTER_DATA,
   SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ,
-  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE, SQLCOM_UNION_SELECT
+  SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_MULTI_DELETE, SQLCOM_UNION_SELECT,
+  SQLCOM_SHOW_BINLOG_EVENTS
 };
 
 enum lex_states { STATE_START, STATE_CHAR, STATE_IDENT,

sql/sql_parse.cc

@@ -1179,6 +1179,13 @@ mysql_execute_command(void)
     res = show_slave_hosts(thd);
     break;
   }
+  case SQLCOM_SHOW_BINLOG_EVENTS:
+  {
+    if(check_access(thd, FILE_ACL, any_db))
+      goto error;
+    res = show_binlog_events(thd);
+    break;
+  }
   case SQLCOM_BACKUP_TABLE:
     {
       if (check_db_used(thd,tables) ||

sql/sql_repl.cc

@@ -381,7 +381,8 @@ void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
 
   if (pos < 4)
   {
-    errmsg = "Client requested master to start repliction from impossible position.\n";
+    errmsg = "Client requested master to start repliction from \
+impossible position";
     goto err;
   }
  
@@ -826,6 +827,105 @@ void reset_master()
 
 }
 
+
+int show_binlog_events(THD* thd)
+{
+  DBUG_ENTER("show_binlog_events");
+  List<Item> field_list;
+  const char* errmsg = 0;
+  IO_CACHE log;
+  File file = -1;
+  
+  Log_event::init_show_field_list(&field_list);  
+  if (send_fields(thd, field_list, 1))
+    DBUG_RETURN(-1);
+  
+  if (mysql_bin_log.is_open())
+  {
+    LOG_INFO linfo;
+    char search_file_name[FN_REFLEN];
+    LEX_MASTER_INFO* lex_mi = &thd->lex.mi;
+    uint event_count, limit_start, limit_end;
+    const char* log_file_name = lex_mi->log_file_name;
+    Log_event* ev;
+    ulong pos = (ulong) lex_mi->pos;
+      
+    limit_start = thd->lex.select->offset_limit;
+    limit_end = thd->lex.select->select_limit + limit_start;
+
+    if (log_file_name)
+      mysql_bin_log.make_log_name(search_file_name, log_file_name);
+    else
+      search_file_name[0] = 0;
+
+    linfo.index_file_offset = 0;
+    thd->current_linfo = &linfo;
+    
+    if (mysql_bin_log.find_first_log(&linfo, search_file_name))
+    {
+      errmsg = "Could not find target log";
+      goto err;
+    }
+
+    if ((file=open_binlog(&log, linfo.log_file_name, &errmsg)) < 0)
+      goto err;
+
+    if (pos < 4)
+    {
+      errmsg = "Invalid log position";
+      goto err;
+    }
+
+    pthread_mutex_lock(mysql_bin_log.get_log_lock());
+ 
+    my_b_seek(&log, pos);
+
+    for (event_count = 0;
+	(ev = Log_event::read_log_event(&log, 0));)
+    {
+      if (event_count >= limit_start &&
+	   ev->net_send(thd, linfo.log_file_name, pos))
+	{
+	  errmsg = "Net error";
+	  delete ev;
+	  pthread_mutex_unlock(mysql_bin_log.get_log_lock());
+          goto err;
+	}
+      
+      pos = my_b_tell(&log);	
+      delete ev;
+
+      if (++event_count >= limit_end)
+	break;
+    }
+
+    if (event_count < limit_end && log.error)
+    {
+      errmsg = "Wrong offset or I/O error";
+      goto err;
+    }
+    
+    pthread_mutex_unlock(mysql_bin_log.get_log_lock());
+  }
+
+err:
+  if (file >= 0)
+  {
+    end_io_cache(&log);
+    (void) my_close(file, MYF(MY_WME));
+  }
+  
+  if (errmsg)
+  {
+    net_printf(&thd->net, ER_SHOW_BINLOG_EVENTS, errmsg);
+    DBUG_RETURN(1);
+  }
+
+  send_eof(&thd->net);
+  DBUG_RETURN(0);
+}
+
+
 int show_slave_hosts(THD* thd)
 {
   DBUG_ENTER("show_slave_hosts");

sql/sql_repl.h

@@ -29,6 +29,7 @@ int load_master_data(THD* thd);
 int connect_to_master(THD *thd, MYSQL* mysql, MASTER_INFO* mi);
 int change_master(THD* thd);
 int show_slave_hosts(THD* thd);
+int show_binlog_events(THD* thd);
 void reset_slave();
 void reset_master();
 void init_slave_list();

sql/sql_yacc.yy

@@ -130,6 +130,8 @@ bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
 %token	LOAD
 %token	LOCK_SYM
 %token	UNLOCK_SYM
+%token  BINLOG_SYM
+%token  EVENTS_SYM
 
 %token	ACTION
 %token	AGGREGATE_SYM
@@ -2406,6 +2408,10 @@ show_param:
           {
 	    Lex->sql_command = SQLCOM_SHOW_SLAVE_HOSTS;
           }
+        | BINLOG_SYM EVENTS_SYM binlog_in binlog_from limit_clause
+          {
+	    Lex->sql_command = SQLCOM_SHOW_BINLOG_EVENTS;
+          } 
 	| keys_or_index FROM table_ident opt_db
 	  {
 	    Lex->sql_command= SQLCOM_SHOW_KEYS;
@@ -2456,6 +2462,15 @@ opt_full:
 	/* empty */ { Lex->verbose=0; }
 	| FULL	    { Lex->verbose=1; }
 
+binlog_in:
+	/* empty */ { Lex->mi.log_file_name = 0; }
+        | IN_SYM TEXT_STRING { Lex->mi.log_file_name = $2.str; }
+
+binlog_from:
+	/* empty */ { Lex->mi.pos = 4; /* skip magic number */ }
+        | FROM ULONGLONG_NUM { Lex->mi.pos = $2; }
+
+
 /* A Oracle compatible synonym for show */
 describe:
 	describe_command table_ident