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MDEV-8931: (server part of) session state tracking

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System variables tracking
This commit is contained in:
Oleksandr Byelkin
2016-04-15 20:47:45 +02:00
parent e7608a78ef
commit c8948b0d0d
22 changed files with 1486 additions and 156 deletions
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230
sql/sql_show.cc
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@ -3212,6 +3212,132 @@ void remove_status_vars(SHOW_VAR *list)
}
/**
@brief Returns the value of a system or a status variable.
@param thd [in] The handle of the current THD.
@param variable [in] Details of the variable.
@param value_type [in] Variable type.
@param show_type [in] Variable show type.
@param charset [out] Character set of the value.
@param buff [in,out] Buffer to store the value.
(Needs to have enough memory
to hold the value of variable.)
@param length [out] Length of the value.
@return Pointer to the value buffer.
*/
const char* get_one_variable(THD *thd,
const SHOW_VAR *variable,
enum_var_type value_type, SHOW_TYPE show_type,
system_status_var *status_var,
const CHARSET_INFO **charset, char *buff,
size_t *length)
{
void *value= variable->value;
const char *pos= buff;
const char *end= buff;
if (show_type == SHOW_SYS)
{
sys_var *var= (sys_var *) value;
show_type= var->show_type();
value= var->value_ptr(thd, value_type, &null_lex_str);
*charset= var->charset(thd);
}
/*
note that value may be == buff. All SHOW_xxx code below
should still work in this case
*/
switch (show_type) {
case SHOW_DOUBLE_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_DOUBLE:
/* 6 is the default precision for '%f' in sprintf() */
end= buff + my_fcvt(*(double *) value, 6, buff, NULL);
break;
case SHOW_LONG_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_ULONG:
case SHOW_LONG_NOFLUSH: // the difference lies in refresh_status()
end= int10_to_str(*(long*) value, buff, 10);
break;
case SHOW_LONGLONG_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_ULONGLONG:
end= longlong10_to_str(*(longlong*) value, buff, 10);
break;
case SHOW_HA_ROWS:
end= longlong10_to_str((longlong) *(ha_rows*) value, buff, 10);
break;
case SHOW_BOOL:
end= strmov(buff, *(bool*) value ? "ON" : "OFF");
break;
case SHOW_MY_BOOL:
end= strmov(buff, *(my_bool*) value ? "ON" : "OFF");
break;
case SHOW_UINT:
end= int10_to_str((long) *(uint*) value, buff, 10);
break;
case SHOW_SINT:
end= int10_to_str((long) *(int*) value, buff, -10);
break;
case SHOW_SLONG:
end= int10_to_str(*(long*) value, buff, -10);
break;
case SHOW_SLONGLONG:
end= longlong10_to_str(*(longlong*) value, buff, -10);
break;
case SHOW_HAVE:
{
SHOW_COMP_OPTION tmp= *(SHOW_COMP_OPTION*) value;
pos= show_comp_option_name[(int) tmp];
end= strend(pos);
break;
}
case SHOW_CHAR:
{
if (!(pos= (char*)value))
pos= "";
end= strend(pos);
break;
}
case SHOW_CHAR_PTR:
{
if (!(pos= *(char**) value))
pos= "";
end= strend(pos);
break;
}
case SHOW_LEX_STRING:
{
LEX_STRING *ls=(LEX_STRING*)value;
if (!(pos= ls->str))
end= pos= "";
else
end= pos + ls->length;
break;
}
case SHOW_UNDEF:
break; // Return empty string
case SHOW_SYS: // Cannot happen
default:
DBUG_ASSERT(0);
break;
}
*length= (size_t) (end - pos);
return pos;
}
static bool show_status_array(THD *thd, const char *wild,
SHOW_VAR *variables,
enum enum_var_type scope,
@ -3324,109 +3450,21 @@ static bool show_status_array(THD *thd, const char *wild,
name_buffer, wild))) &&
(!cond || cond->val_int()))
{
void *value=var->value;
const char *pos, *end; // We assign a lot of const's
const char *pos; // We assign a lot of const's
size_t length;
if (show_type == SHOW_SYS)
{
sys_var *var= (sys_var *) value;
show_type= var->show_type();
mysql_mutex_lock(&LOCK_global_system_variables);
value= var->value_ptr(thd, scope, &null_lex_str);
charset= var->charset(thd);
}
pos= get_one_variable(thd, var, scope, show_type, status_var,
&charset, buff, &length);
pos= end= buff;
/*
note that value may be == buff. All SHOW_xxx code below
should still work in this case
*/
switch (show_type) {
case SHOW_DOUBLE_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_DOUBLE:
/* 6 is the default precision for '%f' in sprintf() */
end= buff + my_fcvt(*(double *) value, 6, buff, NULL);
break;
case SHOW_LONG_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_ULONG:
case SHOW_LONG_NOFLUSH: // the difference lies in refresh_status()
end= int10_to_str(*(long*) value, buff, 10);
break;
case SHOW_LONGLONG_STATUS:
value= ((char *) status_var + (intptr) value);
/* fall through */
case SHOW_ULONGLONG:
end= longlong10_to_str(*(longlong*) value, buff, 10);
break;
case SHOW_HA_ROWS:
end= longlong10_to_str((longlong) *(ha_rows*) value, buff, 10);
break;
case SHOW_BOOL:
end= strmov(buff, *(bool*) value ? "ON" : "OFF");
break;
case SHOW_MY_BOOL:
end= strmov(buff, *(my_bool*) value ? "ON" : "OFF");
break;
case SHOW_UINT:
end= int10_to_str((long) *(uint*) value, buff, 10);
break;
case SHOW_SINT:
end= int10_to_str((long) *(int*) value, buff, -10);
break;
case SHOW_SLONG:
end= int10_to_str(*(long*) value, buff, -10);
break;
case SHOW_SLONGLONG:
end= longlong10_to_str(*(longlong*) value, buff, -10);
break;
case SHOW_HAVE:
{
SHOW_COMP_OPTION tmp= *(SHOW_COMP_OPTION*) value;
pos= show_comp_option_name[(int) tmp];
end= strend(pos);
break;
}
case SHOW_CHAR:
{
if (!(pos= (char*)value))
pos= "";
end= strend(pos);
break;
}
case SHOW_CHAR_PTR:
{
if (!(pos= *(char**) value))
pos= "";
end= strend(pos);
break;
}
case SHOW_LEX_STRING:
{
LEX_STRING *ls=(LEX_STRING*)value;
if (!(pos= ls->str))
end= pos= "";
else
end= pos + ls->length;
break;
}
case SHOW_UNDEF:
break; // Return empty string
case SHOW_SYS: // Cannot happen
default:
DBUG_ASSERT(0);
break;
}
table->field[1]->store(pos, (uint32) (end - pos), charset);
table->field[1]->store(pos, (uint32) length, charset);
thd->count_cuted_fields= CHECK_FIELD_IGNORE;
table->field[1]->set_notnull();
if (var->type == SHOW_SYS)
if (show_type == SHOW_SYS)
mysql_mutex_unlock(&LOCK_global_system_variables);
if (schema_table_store_record(thd, table))
{
res= TRUE;