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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems
* Copyright (C) 2010 Stewart Smith
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include <drizzled/plugin/function.h>
#include <drizzled/session.h>
using namespace std;
using namespace drizzled;
#include <drizzled/function/str/strfunc.h>
class UserFunction :public Item_str_func
{
protected:
bool init (const char *user, const char *host);
public:
UserFunction()
{
str_value.set("", 0, system_charset_info);
}
String *val_str(String *)
{
assert(fixed == 1);
return (null_value ? 0 : &str_value);
}
bool fix_fields(Session *session, Item **ref);
void fix_length_and_dec()
{
max_length= (USERNAME_CHAR_LENGTH + HOSTNAME_LENGTH + 1) *
system_charset_info->mbmaxlen;
}
const char *func_name() const { return "user"; }
const char *fully_qualified_func_name() const { return "user()"; }
int save_in_field(Field *field,
bool )
{
return save_str_value_in_field(field, &str_value);
}
};
/**
@todo
make USER() replicate properly (currently it is replicated to "")
*/
bool UserFunction::init(const char *user, const char *host)
{
assert(fixed == 1);
// For system threads (e.g. replication SQL thread) user may be empty
if (user)
{
const CHARSET_INFO * const cs= str_value.charset();
uint32_t res_length= (strlen(user)+strlen(host)+2) * cs->mbmaxlen;
if (str_value.alloc(res_length))
{
null_value=1;
return true;
}
res_length=cs->cset->snprintf(cs, (char*)str_value.ptr(), res_length,
"%s@%s", user, host);
str_value.length(res_length);
str_value.mark_as_const();
}
return false;
}
bool UserFunction::fix_fields(Session *session, Item **ref)
{
return (Item_str_func::fix_fields(session, ref) ||
init(session->getSecurityContext().getUser().c_str(),
session->getSecurityContext().getIp().c_str()));
}
plugin::Create_function<UserFunction> *user_function= NULL;
static int initialize(drizzled::module::Context &context)
{
user_function= new plugin::Create_function<UserFunction>("user");
context.add(user_function);
return 0;
}
DRIZZLE_DECLARE_PLUGIN
{
DRIZZLE_VERSION_ID,
"user_function",
"1.0",
"Stewart Smith",
"USER() and CURRENT_USER()",
PLUGIN_LICENSE_GPL,
initialize, /* Plugin Init */
NULL, /* system variables */
NULL /* config options */
}
DRIZZLE_DECLARE_PLUGIN_END;
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