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/*
This file is part of GNUnet.
Copyright (C) 2013 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public Liceidentity as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet 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 Liceidentity for more details.
You should have received a copy of the GNU General Public Liceidentity
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file identity/identity_api_lookup.c
* @brief api to lookup an ego
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_identity_service.h"
#define LOG(kind,...) GNUNET_log_from (kind, "identity-api",__VA_ARGS__)
/**
* Handle for ego lookup.
*/
struct GNUNET_IDENTITY_EgoLookup
{
/**
* Handle to the identity service.
*/
struct GNUNET_IDENTITY_Handle *identity;
/**
* Name of the ego we are looking up.
*/
char *name;
/**
* Function to call with the result.
*/
GNUNET_IDENTITY_EgoCallback cb;
/**
* Closure for @e cb
*/
void *cb_cls;
};
/**
* Method called to inform about the egos of this peer.
*
* When used with #GNUNET_IDENTITY_connect, this function is
* initially called for all egos and then again whenever a
* ego's name changes or if it is deleted. At the end of
* the initial pass over all egos, the function is once called
* with 'NULL' for @a ego. That does NOT mean that the callback won't
* be invoked in the future or that there was an error.
*
* If the @a name matches the name from @a cls, we found the zone
* for our computation and will invoke the callback.
* If we have iterated over all egos and not found the name, we
* invoke the callback with NULL.
*
* @param cls closure with the `struct GNUNET_IDENTITY_EgoLookup`
* @param ego ego handle
* @param ctx context for application to store data for this ego
* (during the lifetime of this process, initially NULL)
* @param name name assigned by the user for this ego,
* NULL if the user just deleted the ego and it
* must thus no longer be used
*/
static void
identity_cb (void *cls,
struct GNUNET_IDENTITY_Ego *ego,
void **ctx,
const char *name)
{
struct GNUNET_IDENTITY_EgoLookup *el = cls;
if ( (NULL != name) &&
(0 == strcmp (name,
el->name)) )
{
el->cb (el->cb_cls,
ego);
GNUNET_IDENTITY_ego_lookup_cancel (el);
return;
}
if (NULL == ego)
{
/* not found */
el->cb (el->cb_cls,
NULL);
GNUNET_IDENTITY_ego_lookup_cancel (el);
return;
}
}
/**
* Lookup an ego by name.
*
* @param cfg configuration to use
* @param name name to look up
* @param cb callback to invoke with the result
* @param cb_cls closure for @a cb
* @return NULL on error
*/
struct GNUNET_IDENTITY_EgoLookup *
GNUNET_IDENTITY_ego_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *name,
GNUNET_IDENTITY_EgoCallback cb,
void *cb_cls)
{
struct GNUNET_IDENTITY_EgoLookup *el;
el = GNUNET_new (struct GNUNET_IDENTITY_EgoLookup);
el->name = GNUNET_strdup (name);
el->cb = cb;
el->cb_cls = cb_cls;
el->identity = GNUNET_IDENTITY_connect (cfg,
&identity_cb,
el);
return el;
}
/**
* Abort ego lookup attempt.
*
* @param el handle for lookup to abort
*/
void
GNUNET_IDENTITY_ego_lookup_cancel (struct GNUNET_IDENTITY_EgoLookup *el)
{
GNUNET_IDENTITY_disconnect (el->identity);
GNUNET_free (el->name);
GNUNET_free (el);
}
/* end of identity_api_lookup.c */
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