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/*
This file is part of GNUnet
Copyright (C) 2009, 2011 GNUnet e.V.
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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file datastore/plugin_datastore_template.c
* @brief template-based datastore backend
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_datastore_plugin.h"
/**
* Context for all functions in this plugin.
*/
struct Plugin
{
/**
* Our execution environment.
*/
struct GNUNET_DATASTORE_PluginEnvironment *env;
};
/**
* Get an estimate of how much space the database is
* currently using.
*
* @param cls our "struct Plugin*"
* @return number of bytes used on disk
*/
static void
template_plugin_estimate_size (void *cls, unsigned long long *estimate)
{
if (NULL == estimate)
return;
GNUNET_break (0);
*estimate = 0;
}
/**
* Store an item in the datastore.
*
* @param cls closure
* @param key key for the item
* @param absent true if the key was not found in the bloom filter
* @param size number of bytes in data
* @param data content stored
* @param type type of the content
* @param priority priority of the content
* @param anonymity anonymity-level for the content
* @param replication replication-level for the content
* @param expiration expiration time for the content
* @param cont continuation called with success or failure status
* @param cont_cls continuation closure
*/
static void
template_plugin_put (void *cls,
const struct GNUNET_HashCode *key,
bool absent,
uint32_t size,
const void *data,
enum GNUNET_BLOCK_Type type,
uint32_t priority,
uint32_t anonymity,
uint32_t replication,
struct GNUNET_TIME_Absolute expiration,
PluginPutCont cont,
void *cont_cls)
{
GNUNET_break (0);
cont (cont_cls, key, size, GNUNET_SYSERR, "not implemented");
}
/**
* Get one of the results for a particular key in the datastore.
*
* @param cls closure
* @param next_uid return the result with lowest uid >= next_uid
* @param random if true, return a random result instead of using next_uid
* @param key maybe NULL (to match all entries)
* @param type entries of which type are relevant?
* Use 0 for any type.
* @param proc function to call on each matching value;
* will be called with NULL if nothing matches
* @param proc_cls closure for proc
*/
static void
template_plugin_get_key (void *cls,
uint64_t next_uid,
bool random,
const struct GNUNET_HashCode *key,
enum GNUNET_BLOCK_Type type,
PluginDatumProcessor proc,
void *proc_cls)
{
GNUNET_break (0);
}
/**
* Get a random item for replication. Returns a single, not expired,
* random item from those with the highest replication counters. The
* item's replication counter is decremented by one IF it was positive
* before. Call 'proc' with all values ZERO or NULL if the datastore
* is empty.
*
* @param cls closure
* @param proc function to call the value (once only).
* @param proc_cls closure for proc
*/
static void
template_plugin_get_replication (void *cls, PluginDatumProcessor proc,
void *proc_cls)
{
GNUNET_break (0);
}
/**
* Get a random item for expiration. Call 'proc' with all values ZERO
* or NULL if the datastore is empty.
*
* @param cls closure
* @param proc function to call the value (once only).
* @param proc_cls closure for proc
*/
static void
template_plugin_get_expiration (void *cls, PluginDatumProcessor proc,
void *proc_cls)
{
GNUNET_break (0);
}
/**
* Call the given processor on an item with zero anonymity.
*
* @param cls our "struct Plugin*"
* @param next_uid return the result with lowest uid >= next_uid
* @param type entries of which type should be considered?
* Must not be zero (ANY).
* @param proc function to call on the matching value;
* will be called with NULL if no value matches
* @param proc_cls closure for proc
*/
static void
template_plugin_get_zero_anonymity (void *cls, uint64_t next_uid,
enum GNUNET_BLOCK_Type type,
PluginDatumProcessor proc, void *proc_cls)
{
GNUNET_break (0);
}
/**
* Drop database.
*/
static void
template_plugin_drop (void *cls)
{
GNUNET_break (0);
}
/**
* Get all of the keys in the datastore.
*
* @param cls closure
* @param proc function to call on each key
* @param proc_cls closure for proc
*/
static void
template_get_keys (void *cls,
PluginKeyProcessor proc,
void *proc_cls)
{
proc (proc_cls, NULL, 0);
}
/**
* Remove a particular key in the datastore.
*
* @param cls closure
* @param key key for the content
* @param size number of bytes in data
* @param data content stored
* @param cont continuation called with success or failure status
* @param cont_cls continuation closure for @a cont
*/
static void
template_plugin_remove_key (void *cls,
const struct GNUNET_HashCode *key,
uint32_t size,
const void *data,
PluginRemoveCont cont,
void *cont_cls)
{
GNUNET_break (0);
cont (cont_cls, key, size, GNUNET_SYSERR, "not implemented");
}
/**
* Entry point for the plugin.
*
* @param cls the "struct GNUNET_DATASTORE_PluginEnvironment*"
* @return our "struct Plugin*"
*/
void *
libgnunet_plugin_datastore_template_init (void *cls)
{
struct GNUNET_DATASTORE_PluginEnvironment *env = cls;
struct GNUNET_DATASTORE_PluginFunctions *api;
struct Plugin *plugin;
plugin = GNUNET_new (struct Plugin);
plugin->env = env;
api = GNUNET_new (struct GNUNET_DATASTORE_PluginFunctions);
api->cls = plugin;
api->estimate_size = &template_plugin_estimate_size;
api->put = &template_plugin_put;
api->get_key = &template_plugin_get_key;
api->get_replication = &template_plugin_get_replication;
api->get_expiration = &template_plugin_get_expiration;
api->get_zero_anonymity = &template_plugin_get_zero_anonymity;
api->drop = &template_plugin_drop;
api->get_keys = &template_get_keys;
api->remove_key = &template_plugin_remove_key;
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "template",
_("Template database running\n"));
return api;
}
/**
* Exit point from the plugin.
* @param cls our "struct Plugin*"
* @return always NULL
*/
void *
libgnunet_plugin_datastore_template_done (void *cls)
{
struct GNUNET_DATASTORE_PluginFunctions *api = cls;
struct Plugin *plugin = api->cls;
GNUNET_free (plugin);
GNUNET_free (api);
return NULL;
}
/* end of plugin_datastore_template.c */
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