SCRUM:

Task 499 'init_connect, init_slave options'


mysql-test/mysql-test-run.sh:
  Task 499 'init_connect, init_slave options'
  This change needs because mysql-test-run cuts string variable on first space
sql/mysql_priv.h:
  Task 499 'init_connect, init_slave options'
sql/mysqld.cc:
  Task 499 'init_connect, init_slave options'
sql/protocol.cc:
  Task 499 'init_connect, init_slave options'
sql/set_var.cc:
  Task 499 'init_connect, init_slave options'
sql/set_var.h:
  Task 499 'init_connect, init_slave options'
sql/slave.cc:
  Task 499 'init_connect, init_slave options'
sql/sql_class.cc:
  Task 499 'init_connect, init_slave options'
sql/sql_class.h:
  Task 499 'init_connect, init_slave options'
sql/sql_parse.cc:
  Task 499 'init_connect, init_slave options'
sql/sql_show.cc:
  Task 499 'init_connect, init_slave options'

mysql-test/mysql-test-run.sh

@@ -775,7 +775,7 @@ manager_launch()
   ident=$1
   shift
   if [ $USE_MANAGER = 0 ] ; then
-    $@  >> $CUR_MYERR 2>&1  &
+    echo $@ | /bin/sh  >> $CUR_MYERR 2>&1  &
     sleep 2 #hack
     return
   fi

mysql-test/r/init_connect.result

+select hex(@a);
+hex(@a)
+NULL
+select hex(@a);
+hex(@a)
+610063
+set global init_connect="set @a=2;set @b=3";
+select @a, @b;
+@a	@b
+2	3
+set GLOBAL init_connect=DEFAULT;
+select @a;
+@a
+NULL
+set global init_connect="create table t1(a char(10));\
+insert into t1 values ('\0');insert into t1 values('abc')";
+select hex(a) from t1;
+hex(a)
+00
+616263
+set GLOBAL init_connect="adsfsdfsdfs";
+select @a;
+ERROR HY000: Lost connection to MySQL server during query
+drop table t1;

mysql-test/r/rpl_init_slave.result

+stop slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+start slave;
+reset master;
+create table t1(n int);
+insert into t1 values (@a), (@b);
+select * from t1;
+n
+NULL
+NULL
+select * from t1;
+n
+1
+2
+set global init_connect="set @c=1";
+show variables like 'init_connect';
+Variable_name	Value
+init_connect	set @c=1
+drop table t1;
+stop slave;

mysql-test/t/init_connect-master.opt

+--set-variable=init_connect="set @a='a\0c'"

mysql-test/t/init_connect.test

+#
+# Test of init_connect variable
+#
+
+connect (con0,localhost,root,,);
+connection con0;
+select hex(@a);
+connect (con1,localhost,user_1,,);
+connection con1;
+select hex(@a);
+connection con0;
+set global init_connect="set @a=2;set @b=3";
+connect (con2,localhost,user_1,,);
+connection con2;
+select @a, @b;
+connection con0;
+set GLOBAL init_connect=DEFAULT;
+connect (con3,localhost,user_1,,);
+connection con3;
+select @a;
+connection con0;
+set global init_connect="create table t1(a char(10));\
+insert into t1 values ('\0');insert into t1 values('abc')";
+connect (con4,localhost,user_1,,);
+connection con4;
+select hex(a) from t1;
+connection con0;
+set GLOBAL init_connect="adsfsdfsdfs";
+connect (con5,localhost,user_1,,);
+connection con5;
+--error 2013
+select @a;
+connection con0;
+drop table t1;

mysql-test/t/rpl_init_slave-slave.opt

+--init-slave="set @a=1;set @b=2"

mysql-test/t/rpl_init_slave.test

+source include/master-slave.inc;
+
+#
+# Test of init_slave variable
+#
+
+save_master_pos;
+connection slave;
+sync_with_master;
+reset master;
+connection master;
+create table t1(n int);
+insert into t1 values (@a), (@b);
+select * from t1;
+save_master_pos;
+connection slave;
+sync_with_master;
+select * from t1;
+set global init_connect="set @c=1";
+show variables like 'init_connect';
+connection master;
+drop table t1;
+save_master_pos;
+connection slave;
+sync_with_master;
+stop slave;

sql/mysql_priv.h

@@ -769,7 +769,7 @@ extern pthread_mutex_t LOCK_mysql_create_db,LOCK_Acl,LOCK_open,
        LOCK_delayed_status, LOCK_delayed_create, LOCK_crypt, LOCK_timezone,
        LOCK_slave_list, LOCK_active_mi, LOCK_manager,
        LOCK_global_system_variables;
-extern rw_lock_t	LOCK_grant;
+extern rw_lock_t LOCK_grant, LOCK_sys_init_connect, LOCK_sys_init_slave;
 extern pthread_cond_t COND_refresh, COND_thread_count, COND_manager;
 extern pthread_attr_t connection_attrib;
 extern I_List<THD> threads;

sql/mysqld.cc

@@ -300,7 +300,8 @@ char log_error_file[FN_REFLEN], glob_hostname[FN_REFLEN];
 char* log_error_file_ptr= log_error_file;
 char mysql_real_data_home[FN_REFLEN],
      language[LIBLEN],reg_ext[FN_EXTLEN], mysql_charsets_dir[FN_REFLEN],
-     max_sort_char,*mysqld_user,*mysqld_chroot, *opt_init_file;
+     max_sort_char,*mysqld_user,*mysqld_chroot, *opt_init_file,
+     *opt_init_connect, *opt_init_slave;
 char *language_ptr, *default_collation_name, *default_character_set_name;
 char mysql_data_home_buff[2], *mysql_data_home=mysql_real_data_home;
 char server_version[SERVER_VERSION_LENGTH]=MYSQL_SERVER_VERSION;
@@ -344,7 +345,7 @@ pthread_mutex_t LOCK_mysql_create_db, LOCK_Acl, LOCK_open, LOCK_thread_count,
 		LOCK_crypt, LOCK_bytes_sent, LOCK_bytes_received,
 	        LOCK_global_system_variables,
 		LOCK_user_conn, LOCK_slave_list, LOCK_active_mi;
-rw_lock_t	LOCK_grant;
+rw_lock_t	LOCK_grant, LOCK_sys_init_connect, LOCK_sys_init_slave;
 pthread_cond_t COND_refresh,COND_thread_count, COND_slave_stopped,
 	       COND_slave_start;
 pthread_cond_t COND_thread_cache,COND_flush_thread_cache;
@@ -883,6 +884,8 @@ void clean_up(bool print_message)
 #endif
   if (defaults_argv)
     free_defaults(defaults_argv);
+  my_free(sys_init_connect.value, MYF(MY_ALLOW_ZERO_PTR));
+  my_free(sys_init_slave.value, MYF(MY_ALLOW_ZERO_PTR));
   free_tmpdir(&mysql_tmpdir_list);
 #ifdef HAVE_REPLICATION
   my_free(slave_load_tmpdir,MYF(MY_ALLOW_ZERO_PTR));
@@ -949,6 +952,8 @@ static void clean_up_mutexes()
   (void) pthread_cond_destroy(&COND_rpl_status);
 #endif
   (void) pthread_mutex_destroy(&LOCK_active_mi);
+  (void) rwlock_destroy(&LOCK_sys_init_connect);
+  (void) rwlock_destroy(&LOCK_sys_init_slave);
   (void) pthread_mutex_destroy(&LOCK_global_system_variables);
   (void) pthread_cond_destroy(&COND_thread_count);
   (void) pthread_cond_destroy(&COND_refresh);
@@ -2056,6 +2061,14 @@ static int init_common_variables(const char *conf_file_name, int argc,
   global_system_variables.character_set_client= default_charset_info;
   global_system_variables.collation_connection= default_charset_info;
 
+  sys_init_connect.value_length= 0;
+  if ((sys_init_connect.value= opt_init_connect))
+    sys_init_connect.value_length= strlen(opt_init_connect);
+
+  sys_init_slave.value_length= 0;
+  if ((sys_init_slave.value= opt_init_slave))
+    sys_init_slave.value_length= strlen(opt_init_slave);
+
   if (use_temp_pool && bitmap_init(&temp_pool,1024,1))
     return 1;
   return 0;
@@ -2081,6 +2094,8 @@ static int init_thread_environment()
   (void) pthread_mutex_init(&LOCK_user_conn, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_active_mi, MY_MUTEX_INIT_FAST);
   (void) pthread_mutex_init(&LOCK_global_system_variables, MY_MUTEX_INIT_FAST);
+  (void) my_rwlock_init(&LOCK_sys_init_connect, NULL);
+  (void) my_rwlock_init(&LOCK_sys_init_slave, NULL);
   (void) my_rwlock_init(&LOCK_grant, NULL);
   (void) pthread_cond_init(&COND_thread_count,NULL);
   (void) pthread_cond_init(&COND_refresh,NULL);
@@ -3472,7 +3487,9 @@ enum options
   OPT_EXPIRE_LOGS_DAYS,
   OPT_DEFAULT_WEEK_FORMAT,
   OPT_GROUP_CONCAT_MAX_LEN,
-  OPT_DEFAULT_COLLATION
+  OPT_DEFAULT_COLLATION,
+  OPT_INIT_CONNECT,
+  OPT_INIT_SLAVE
 };
 
 
@@ -3638,6 +3655,12 @@ Disable with --skip-bdb (will save memory).",
 #endif /* End HAVE_INNOBASE_DB */
   {"help", '?', "Display this help and exit.", 0, 0, 0, GET_NO_ARG, NO_ARG, 0,
    0, 0, 0, 0, 0},
+  {"init-connect", OPT_INIT_CONNECT, "Command what executes for all new connections",
+   (gptr*) &opt_init_connect, (gptr*) &opt_init_connect, 0, GET_STR_ALLOC, REQUIRED_ARG,
+   0, 0, 0, 0, 0, 0},
+  {"init-slave", OPT_INIT_SLAVE, "Command what is executed when replication is starting",
+   (gptr*) &opt_init_slave, (gptr*) &opt_init_slave, 0, GET_STR_ALLOC, REQUIRED_ARG,
+   0, 0, 0, 0, 0, 0},
   {"init-file", OPT_INIT_FILE, "Read SQL commands from this file at startup.",
    (gptr*) &opt_init_file, (gptr*) &opt_init_file, 0, GET_STR, REQUIRED_ARG,
    0, 0, 0, 0, 0, 0},

sql/protocol.cc

@@ -92,6 +92,7 @@ void send_error(THD *thd, uint sql_errno, const char *err)
       /* In bootstrap it's ok to print on stderr */
       fprintf(stderr,"ERROR: %d  %s\n",sql_errno,err);
     }
+    thd->init_connect_error= 1;
     DBUG_VOID_RETURN;
   }
 
@@ -210,6 +211,7 @@ net_printf(THD *thd, uint errcode, ...)
       fprintf(stderr,"ERROR: %d  %s\n",errcode,text_pos);
       thd->fatal_error();
     }
+    thd->init_connect_error= 1;
     DBUG_VOID_RETURN;
   }
 

sql/set_var.cc

@@ -75,6 +75,10 @@ TYPELIB delay_key_write_typelib=
 static bool sys_check_charset(THD *thd, set_var *var);
 static bool sys_update_charset(THD *thd, set_var *var);
 static void sys_set_default_charset(THD *thd, enum_var_type type);
+static bool sys_update_init_connect(THD*, set_var*);
+static void sys_default_init_connect(THD*, enum_var_type type);
+static bool sys_update_init_slave(THD*, set_var*);
+static void sys_default_init_slave(THD*, enum_var_type type);
 static bool set_option_bit(THD *thd, set_var *var);
 static bool set_option_autocommit(THD *thd, set_var *var);
 static bool set_log_update(THD *thd, set_var *var);
@@ -109,6 +113,12 @@ sys_var_str			sys_charset_system("character_set_system",
 				    sys_check_charset,
 				    sys_update_charset,
 				    sys_set_default_charset);
+sys_var_str                     sys_init_connect("init_connect", 0,
+                                                 sys_update_init_connect,
+                                                 sys_default_init_connect);
+sys_var_str                     sys_init_slave("init_slave", 0,
+                                               sys_update_init_slave,
+                                               sys_default_init_slave);
 sys_var_character_set_database	sys_character_set_database("character_set_database");
 sys_var_character_set_client  sys_character_set_client("character_set_client");
 sys_var_character_set_connection  sys_character_set_connection("character_set_connection");
@@ -386,6 +396,8 @@ sys_var *sys_variables[]=
   &sys_foreign_key_checks,
   &sys_group_concat_max_len,
   &sys_identity,
+  &sys_init_connect,
+  &sys_init_slave,
   &sys_insert_id,
   &sys_interactive_timeout,
   &sys_join_buffer_size,
@@ -522,6 +534,8 @@ struct show_var_st init_vars[]= {
   {"have_openssl",	      (char*) &have_openssl,		    SHOW_HAVE},
   {"have_query_cache",        (char*) &have_query_cache,            SHOW_HAVE},
   {"init_file",               (char*) &opt_init_file,               SHOW_CHAR_PTR},
+  {"init_connect",            (char*) &sys_init_connect,            SHOW_SYS},
+  {"init_slave",              (char*) &sys_init_slave,              SHOW_SYS},
 #ifdef HAVE_INNOBASE_DB
   {"innodb_additional_mem_pool_size", (char*) &innobase_additional_mem_pool_size, SHOW_LONG },
   {"innodb_buffer_pool_size", (char*) &innobase_buffer_pool_size, SHOW_LONG },
@@ -659,6 +673,83 @@ struct show_var_st init_vars[]= {
   Functions to check and update variables
 */
 
+
+static bool sys_update_init_connect(THD *thd, set_var *var)
+{
+  char *res= 0, *old_value;
+  uint new_length;
+  /* If the string is "", delete old init command */
+  if ((new_length= var->value->str_value.length()))
+  {
+    if (!(res= my_strdup_with_length(var->value->str_value.c_ptr(),
+		     new_length,
+		     MYF(0))))
+      return 1;
+  }
+  /*
+    Replace the old value in such a way that the any thread using
+    the value will work.
+  */
+  rw_wrlock(&LOCK_sys_init_connect);
+  old_value= sys_init_connect.value;
+  sys_init_connect.value= res;
+  sys_init_connect.value_length= new_length;
+  rw_unlock(&LOCK_sys_init_connect);
+  my_free(old_value, MYF(MY_ALLOW_ZERO_PTR));
+  return 0;
+}
+
+
+static void sys_default_init_connect(THD* thd, enum_var_type type)
+{
+  char *old_value;
+  rw_wrlock(&LOCK_sys_init_connect);
+  old_value= sys_init_connect.value;
+  sys_init_connect.value= 0;
+  sys_init_connect.value_length= 0;
+  rw_unlock(&LOCK_sys_init_connect);
+  my_free(old_value, MYF(MY_ALLOW_ZERO_PTR));
+}
+
+
+static bool sys_update_init_slave(THD *thd, set_var *var)
+{
+  char *res= 0, *old_value;
+  uint new_length;
+  /* If the string is "", delete old init command */
+  if ((new_length= var->value->str_value.length()))
+  {
+    if (!(res= my_strdup_with_length(var->value->str_value.c_ptr(),
+		     new_length,
+		     MYF(0))))
+      return 1;
+  }
+  /*
+    Replace the old value in such a way that the any thread using
+    the value will work.
+  */
+  rw_wrlock(&LOCK_sys_init_slave);
+  old_value= sys_init_slave.value;
+  sys_init_slave.value= res;
+  sys_init_slave.value_length= new_length;
+  rw_unlock(&LOCK_sys_init_slave);
+  my_free(old_value, MYF(MY_ALLOW_ZERO_PTR));
+  return 0;
+}
+
+
+static void sys_default_init_slave(THD* thd, enum_var_type type)
+{
+  char *old_value;
+  rw_wrlock(&LOCK_sys_init_slave);
+  old_value= sys_init_slave.value;
+  sys_init_slave.value= 0;
+  sys_init_slave.value_length= 0;
+  rw_unlock(&LOCK_sys_init_slave);
+  my_free(old_value, MYF(MY_ALLOW_ZERO_PTR));
+}
+
+
 /*
   The following 3 functions need to be changed in 4.1 when we allow
   one to change character sets

sql/set_var.h

@@ -137,6 +137,7 @@ class sys_var_str :public sys_var
 {
 public:
   char *value;					// Pointer to allocated string
+  uint value_length;
   sys_check_func check_func;
   sys_update_func update_func;
   sys_set_default_func set_default_func;
@@ -704,6 +705,8 @@ int sql_set_variables(THD *thd, List<set_var_base> *var_list);
 void fix_delay_key_write(THD *thd, enum_var_type type);
 ulong fix_sql_mode(ulong sql_mode);
 extern sys_var_str sys_charset_system;
+extern sys_var_str sys_init_connect;
+extern sys_var_str sys_init_slave;
 CHARSET_INFO *get_old_charset_by_name(const char *old_name);
 gptr find_named(I_List<NAMED_LIST> *list, const char *name, uint length);
 void delete_elements(I_List<NAMED_LIST> *list, void (*free_element)(gptr));

sql/slave.cc

@@ -2448,6 +2448,24 @@ log space");
 }
 
 
+void init_slave_execute(THD *thd, sys_var_str *init_slave_var)
+{
+  Vio* save_vio;
+  ulong save_client_capabilities;
+
+  thd->proc_info= "Execution of init_slave";
+  thd->query= init_slave_var->value;
+  thd->query_length= init_slave_var->value_length;
+  save_client_capabilities= thd->client_capabilities;
+  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
+  save_vio= thd->net.vio;
+  thd->net.vio= 0;
+  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
+  thd->client_capabilities= save_client_capabilities;
+  thd->net.vio= save_vio;
+}
+
+
 /* Slave SQL Thread entry point */
 
 extern "C" pthread_handler_decl(handle_slave_sql,arg)
@@ -2530,6 +2548,20 @@ log '%s' at position %s, relay log '%s' position: %s", RPL_LOG_NAME,
 		    llstr(rli->group_master_log_pos,llbuff),rli->group_relay_log_name,
 		    llstr(rli->group_relay_log_pos,llbuff1));
 
+  /* execute init_slave variable */
+  if (sys_init_slave.value)
+  {
+    rw_wrlock(&LOCK_sys_init_slave);
+    init_slave_execute(thd, &sys_init_slave);
+    rw_unlock(&LOCK_sys_init_slave);
+    if (thd->query_error)
+    {
+      sql_print_error("\
+Slave SQL thread aborted. Can't execute init_slave query");
+      goto err;
+    }
+  }
+
   /* Read queries from the IO/THREAD until this thread is killed */
 
   while (!sql_slave_killed(thd,rli))

sql/sql_class.cc

@@ -121,6 +121,7 @@ THD::THD():user_time(0), is_fatal_error(0),
   system_thread=cleanup_done=0;
   peer_port= 0;					// For SHOW PROCESSLIST
   transaction.changed_tables = 0;
+  init_connect_error= 0;
 #ifdef	__WIN__
   real_id = 0;
 #endif

sql/sql_class.h

@@ -560,6 +560,7 @@ class THD :public ilink
   bool       prepare_command;
   bool	     tmp_table_used;
 
+  bool       init_connect_error;
   /*
     If we do a purge of binary logs, log index info of the threads
     that are currently reading it needs to be adjusted. To do that

sql/sql_parse.cc

@@ -794,6 +794,24 @@ check_connections(THD *thd)
 }
 
 
+void init_connect_execute(THD *thd, sys_var_str *init_connect_var)
+{
+  Vio* save_vio;
+  ulong save_client_capabilities;
+
+  thd->proc_info= "Execution of init_connect";
+  thd->query= init_connect_var->value;
+  thd->query_length= init_connect_var->value_length;
+  save_client_capabilities= thd->client_capabilities;
+  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
+  save_vio= thd->net.vio;
+  thd->net.vio= 0;
+  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
+  thd->client_capabilities= save_client_capabilities;
+  thd->net.vio= save_vio;
+}
+
+
 pthread_handler_decl(handle_one_connection,arg)
 {
   THD *thd=(THD*) arg;
@@ -866,9 +884,35 @@ pthread_handler_decl(handle_one_connection,arg)
     if (thd->client_capabilities & CLIENT_COMPRESS)
       net->compress=1;				// Use compression
 
-    thd->proc_info=0;				// Remove 'login'
-    thd->command=COM_SLEEP;
-    thd->version=refresh_version;
+    thd->version= refresh_version;
+    if (sys_init_connect.value && !(thd->master_access & SUPER_ACL))
+    {
+      rw_wrlock(&LOCK_sys_init_connect);
+      init_connect_execute(thd, &sys_init_connect);
+      rw_unlock(&LOCK_sys_init_connect);
+      if (thd->init_connect_error)
+      {
+        if (thd->user_connect)
+          decrease_user_connections(thd->user_connect);
+        free_root(&thd->mem_root,MYF(0));
+        if (!thd->killed && thd->variables.log_warnings)
+        {
+          sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
+	          thd->thread_id,(thd->db ? thd->db : "unconnected"),
+	          thd->user ? thd->user : "unauthenticated",
+	          thd->host_or_ip,
+	          "Can't execute init_connect query");
+          statistic_increment(aborted_threads,&LOCK_status);
+        }
+        else if (thd->killed)
+        {
+          statistic_increment(aborted_threads,&LOCK_status);
+        }
+        goto end_thread;
+      }
+    }
+
+    thd->proc_info=0;
     thd->set_time();
     thd->init_for_queries();
     while (!net->error && net->vio != 0 && !thd->killed)

sql/sql_show.cc

@@ -1587,9 +1587,12 @@ int mysqld_show(THD *thd, const char *wild, show_var_st *variables,
         break;
       }
       case SHOW_CHAR:
-	pos= value;
-	end= strend(pos);
+      {
+        if (!(pos= value))
+          pos= "";
+        end= strend(pos);
         break;
+       }
       case SHOW_STARTTIME:
 	nr= (long) (thd->query_start() - start_time);
 	end= int10_to_str(nr, buff, 10);