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/*
This file is part of TALER
(C) 2015, 2016, 2017, 2018 GNUnet e.V.
TALER 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.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file wire/wire.c
* @brief Functions for loading wire plugins
* @author Christian Grothoff <christian@grothoff.org>
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_wire_lib.h"
/**
* A wire plugin that we have loaded.
*/
struct WirePlugin
{
/**
* We keep these in a DLL.
*/
struct WirePlugin *next;
/**
* We keep these in a DLL.
*/
struct WirePlugin *prev;
/**
* Type of this wire plugin.
*/
char *type;
/**
* Wire plugin
*/
struct TALER_WIRE_Plugin *plugin;
/**
* Reference counter for the plugin.
*/
unsigned int rc;
};
/**
* Head of the DLL of loaded wire plugins.
*/
static struct WirePlugin *wp_head;
/**
* Tail of the DLL of loaded wire plugins.
*/
static struct WirePlugin *wp_tail;
/**
* Load a WIRE plugin.
*
* @param cfg configuration to use
* @param plugin_name name of the plugin to load
* @return #GNUNET_OK on success
*/
struct TALER_WIRE_Plugin *
TALER_WIRE_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *plugin_name)
{
char *lib_name;
struct TALER_WIRE_Plugin *plugin;
struct WirePlugin *wp;
for (wp = wp_head; NULL != wp; wp = wp->next)
if (0 == strcasecmp (plugin_name,
wp->type))
{
wp->rc++;
return wp->plugin;
}
(void) GNUNET_asprintf (&lib_name,
"libtaler_plugin_wire_%s",
plugin_name);
plugin = GNUNET_PLUGIN_load (lib_name,
(void *) cfg);
if (NULL != plugin)
plugin->library_name = lib_name;
else
GNUNET_free (lib_name);
if (NULL == plugin)
return NULL;
wp = GNUNET_new (struct WirePlugin);
wp->plugin = plugin;
wp->type = GNUNET_strdup (plugin_name);
GNUNET_CONTAINER_DLL_insert (wp_head,
wp_tail,
wp);
wp->rc = 1;
return plugin;
}
/**
* Unload a WIRE plugin.
*
* @param plugin the plugin to unload
*/
void
TALER_WIRE_plugin_unload (struct TALER_WIRE_Plugin *plugin)
{
struct WirePlugin *wp;
char *lib_name;
if (NULL == plugin)
return;
for (wp = wp_head; NULL != wp; wp = wp->next)
{
if (plugin == wp->plugin)
{
wp->rc--;
if (0 < wp->rc)
return;
GNUNET_CONTAINER_DLL_remove (wp_head,
wp_tail,
wp);
GNUNET_free (wp->type);
GNUNET_free (wp);
break;
}
}
lib_name = plugin->library_name;
GNUNET_assert (NULL == GNUNET_PLUGIN_unload (lib_name,
plugin));
GNUNET_free (lib_name);
}
/**
* Closure of #check_for_wire.
*/
struct FindEnabledWireContext
{
/**
* Configuration we are usign.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Callback to invoke.
*/
TALER_WIRE_EnabledCallback cb;
/**
* Closure for @e cb.
*/
void *cb_cls;
};
/**
* Check if @a section begins with "exchange-wire-", and if
* so if the "ENABLE" option is set to "YES". If both are
* true, call the callback from the context with the
* rest of the section name.
*
* @param cls our `struct FindEnabledWireContext`
* @param section name of a section in the configuration
*/
static void
check_for_wire (void *cls,
const char *section)
{
struct FindEnabledWireContext *ctx = cls;
const char *name;
if (0 != strncasecmp (section,
"exchange-wire-",
strlen ("exchange-wire-")))
return;
if (GNUNET_YES !=
GNUNET_CONFIGURATION_get_value_yesno (ctx->cfg,
section,
"ENABLE"))
return;
name = §ion[strlen ("exchange-wire-")];
ctx->cb (ctx->cb_cls,
name);
}
/**
* Check which wire plugins are enabled in @a cfg and call @a cb for each one.
*
* @param cfg configuration to use
* @param cb callback to invoke
* @param cb_cls closure for @a cb
*/
void
TALER_WIRE_find_enabled (const struct GNUNET_CONFIGURATION_Handle *cfg,
TALER_WIRE_EnabledCallback cb,
void *cb_cls)
{
struct FindEnabledWireContext ctx;
ctx.cfg = cfg;
ctx.cb = cb;
ctx.cb_cls = cb_cls;
GNUNET_CONFIGURATION_iterate_sections (cfg,
&check_for_wire,
&ctx);
}
/* end of wire.c */
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