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/*
This file is part of GNUnet
(C) 2004, 2005, 2006, 2007, 2009 Christian Grothoff (and other contributing authors)
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 2, 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 datastore/gnunet-service-datastore.c
* @brief Management for the datastore for files stored on a GNUnet node
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_protocols.h"
#include "plugin_datastore.h"
#include "datastore.h"
/**
* Our datastore plugin.
*/
struct DatastorePlugin
{
/**
* API of the transport as returned by the plugin's
* initialization function.
*/
struct GNUNET_DATSTORE_PluginFunctions *api;
/**
* Short name for the plugin (i.e. "sqlite").
*/
char *short_name;
/**
* Name of the library (i.e. "gnunet_plugin_datastore_sqlite").
*/
char *lib_name;
/**
* Environment this transport service is using
* for this plugin.
*/
struct GNUNET_DATASTORE_PluginEnvironment env;
};
/**
* Our datastore plugin (NULL if not available).
*/
static struct DatastorePlugin *plugin;
/**
* List of handlers for the messages understood by this
* service.
*/
static struct GNUNET_SERVER_MessageHandler handlers[] = {
/* {&handle_xxx, NULL, GNUNET_MESSAGE_TYPE_DATASTORE_XXX, 0}, */
{NULL, NULL, 0, 0}
};
/**
* Load the datastore plugin.
*/
static struct DatastorePlugin *
load_plugin (struct GNUNET_CONFIGURATION_Handle *cfg,
struct GNUNET_SCHEDULER_Handle *sched)
{
struct DatastorePlugin *ret;
char *libname;
char *name;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
"DATASTORE", "DATABASE", &name))
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("No `%s' specified for `%s' in configuration!\n"),
"DATABASE",
"DATASTORE");
return NULL;
}
ret = GNUNET_malloc (sizeof(struct DatastorePlugin));
ret->env.cfg = cfg;
ret->env.sched = sched;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
_("Loading `%s' datastore plugin\n"), name);
GNUNET_asprintf (&libname, "libgnunet_plugin_datastore_%s", name);
ret->short_name = GNUNET_strdup (name);
ret->lib_name = libname;
ret->api = GNUNET_PLUGIN_load (libname, &ret->env);
if (ret->api == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
_("Failed to load datastore plugin for `%s'\n"), name);
GNUNET_free (ret->short_name);
GNUNET_free (libname);
GNUNET_free (ret);
return NULL;
}
return ret;
}
/**
* Function called when the service shuts
* down. Unloads our datastore plugin.
*
* @param cls closure
* @param cfg configuration to use
*/
static void
unload_plugin (struct DatastorePlugin *plug)
{
#if DEBUG_DATASTORE
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Datastore service is unloading plugin...\n");
#endif
GNUNET_break (NULL == GNUNET_PLUGIN_unload (plug->lib_name, plug->api));
GNUNET_free (plug->lib_name);
GNUNET_free (plug->short_name);
GNUNET_free (plug);
}
/**
* Last task run during shutdown. Disconnects us from
* the transport and core.
*/
static void
cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
unload_plugin (plugin);
plugin = NULL;
}
/**
* Process datastore requests.
*
* @param cls closure
* @param sched scheduler to use
* @param server the initialized server
* @param cfg configuration to use
*/
static void
run (void *cls,
struct GNUNET_SCHEDULER_Handle *sched,
struct GNUNET_SERVER_Handle *server,
struct GNUNET_CONFIGURATION_Handle *cfg)
{
plugin = load_plugin (cfg, sched);
if (NULL == plugin)
return;
GNUNET_SERVER_add_handlers (server, handlers);
GNUNET_SCHEDULER_add_delayed (sched,
GNUNET_YES,
GNUNET_SCHEDULER_PRIORITY_IDLE,
GNUNET_SCHEDULER_NO_PREREQUISITE_TASK,
GNUNET_TIME_UNIT_FOREVER_REL,
&cleaning_task, NULL);
}
/**
* The main function for the datastore service.
*
* @param argc number of arguments from the command line
* @param argv command line arguments
* @return 0 ok, 1 on error
*/
int
main (int argc, char *const *argv)
{
int ret;
ret = (GNUNET_OK ==
GNUNET_SERVICE_run (argc,
argv,
"datastore", &run, NULL, NULL, NULL)) ? 0 : 1;
return ret;
}
/* end of gnunet-service-datastore.c */
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