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/*
This file is part of GNUnet.
(C)
GNUnet 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; 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 License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @file peerstore/peerstore_api.c
* @brief API for peerstore
* @author Omar Tarabai
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "peerstore.h"
#include "peerstore_common.h"
#define LOG(kind,...) GNUNET_log_from (kind, "peerstore-api",__VA_ARGS__)
/******************************************************************************/
/************************ DATA STRUCTURES ****************************/
/******************************************************************************/
/**
* Handle to the PEERSTORE service.
*/
struct GNUNET_PEERSTORE_Handle
{
/**
* Our configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Connection to the service.
*/
struct GNUNET_CLIENT_Connection *client;
};
/**
* Context for a store request
*/
struct GNUNET_PEERSTORE_StoreContext
{
/**
* Handle to the PEERSTORE service.
*/
struct GNUNET_PEERSTORE_Handle *h;
/**
* Continuation called with service response
*/
GNUNET_PEERSTORE_Continuation cont;
/**
* Closure for 'cont'
*/
void *cont_cls;
};
/******************************************************************************/
/******************* CONNECTION FUNCTIONS *********************/
/******************************************************************************/
/**
* Close the existing connection to PEERSTORE and reconnect.
*
* @param h handle to the service
*/
static void
reconnect (struct GNUNET_PEERSTORE_Handle *h)
{
LOG(GNUNET_ERROR_TYPE_DEBUG, "Reconnecting...\n");
if (NULL != h->client)
{
GNUNET_CLIENT_disconnect (h->client);
h->client = NULL;
}
h->client = GNUNET_CLIENT_connect ("peerstore", h->cfg);
}
/**
* Connect to the PEERSTORE service.
*
* @return NULL on error
*/
struct GNUNET_PEERSTORE_Handle *
GNUNET_PEERSTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_CLIENT_Connection *client;
struct GNUNET_PEERSTORE_Handle *h;
client = GNUNET_CLIENT_connect ("peerstore", cfg);
if(NULL == client)
return NULL;
h = GNUNET_new (struct GNUNET_PEERSTORE_Handle);
h->client = client;
h->cfg = cfg;
LOG(GNUNET_ERROR_TYPE_DEBUG, "New connection created\n");
return h;
}
/**
* Disconnect from the PEERSTORE service
* Do not call in case of pending requests
*
* @param h handle to disconnect
*/
void
GNUNET_PEERSTORE_disconnect(struct GNUNET_PEERSTORE_Handle *h)
{
if (NULL != h->client)
{
GNUNET_CLIENT_disconnect (h->client);
h->client = NULL;
}
GNUNET_free(h);
LOG(GNUNET_ERROR_TYPE_DEBUG, "Disconnected, BYE!\n");
}
/******************************************************************************/
/******************* ADD FUNCTIONS *********************/
/******************************************************************************/
/**
* When a response for store request is received
*
* @param cls a 'struct GNUNET_PEERSTORE_StoreContext *'
* @param msg message received, NULL on timeout or fatal error
*/
void store_response_receiver (void *cls, const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_PEERSTORE_StoreContext *sc = cls;
uint16_t msg_type;
if(NULL == sc->cont)
return;
if(NULL == msg)
{
sc->cont(sc->cont_cls, GNUNET_SYSERR);
reconnect(sc->h);
return;
}
msg_type = ntohs(msg->type);
if(GNUNET_MESSAGE_TYPE_PEERSTORE_STORE_RESULT_OK == msg_type)
sc->cont(sc->cont_cls, GNUNET_OK);
else if(GNUNET_MESSAGE_TYPE_PEERSTORE_STORE_RESULT_FAIL == msg_type)
sc->cont(sc->cont_cls, GNUNET_SYSERR);
else
{
LOG(GNUNET_ERROR_TYPE_ERROR, "Invalid response from `PEERSTORE' service.\n");
sc->cont(sc->cont_cls, GNUNET_SYSERR);
}
}
/**
* Cancel a store request
*
* @param sc Store request context
*/
void
GNUNET_PEERSTORE_store_cancel (struct GNUNET_PEERSTORE_StoreContext *sc)
{
sc->cont = NULL;
}
/**
* Store a new entry in the PEERSTORE
*
* @param h Handle to the PEERSTORE service
* @param sub_system name of the sub system
* @param peer Peer Identity
* @param key entry key
* @param value entry value BLOB
* @param size size of 'value'
* @param lifetime relative time after which the entry is (possibly) deleted
* @param cont Continuation function after the store request is processed
* @param cont_cls Closure for 'cont'
*/
struct GNUNET_PEERSTORE_StoreContext *
GNUNET_PEERSTORE_store (struct GNUNET_PEERSTORE_Handle *h,
const char *sub_system,
const struct GNUNET_PeerIdentity *peer,
const char *key,
const void *value,
size_t size,
struct GNUNET_TIME_Relative lifetime,
GNUNET_PEERSTORE_Continuation cont,
void *cont_cls)
{
struct GNUNET_PEERSTORE_StoreContext *sc;
struct StoreRecordMessage *srm;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Storing value (size: %lu) for subsytem `%s', peer `%s', key `%s'\n",
size, sub_system, GNUNET_i2s (peer), key);
sc = GNUNET_new(struct GNUNET_PEERSTORE_StoreContext);
sc->cont = cont;
sc->cont_cls = cont_cls;
sc->h = h;
srm = PEERSTORE_create_record_message(sub_system,
peer,
key,
value,
size,
lifetime);
GNUNET_CLIENT_transmit_and_get_response(h->client,
(const struct GNUNET_MessageHeader *)srm,
GNUNET_TIME_UNIT_FOREVER_REL,
GNUNET_YES,
&store_response_receiver,
sc);
return sc;
}
/* end of peerstore_api.c */
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