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/*
This file is part of GNUnet.
Copyright (C) 2009-2014, 2016 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
/**
* @file core/core_api_monitor_peers.c
* @brief implementation of the peer_iterate function
* @author Christian Grothoff
* @author Nathan Evans
*/
#include "platform.h"
#include "gnunet_core_service.h"
#include "core.h"
/**
* Handle to a CORE monitoring operation.
*/
struct GNUNET_CORE_MonitorHandle
{
/**
* Our configuration.
*/
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
* Our connection to the service.
*/
struct GNUNET_MQ_Handle *mq;
/**
* Function called with the peer.
*/
GNUNET_CORE_MonitorCallback peer_cb;
/**
* Closure for @e peer_cb.
*/
void *peer_cb_cls;
};
/**
* Protocol error, reconnect to CORE service and notify
* client.
*
* @param mh monitoring session to reconnect to CORE
*/
static void
reconnect (struct GNUNET_CORE_MonitorHandle *mh);
/**
* Generic error handler, called with the appropriate error code and
* the same closure specified at the creation of the message queue.
* Not every message queue implementation supports an error handler.
*
* @param cls closure, a `struct GNUNET_CORE_MonitorHandle *`
* @param error error code
*/
static void
handle_mq_error (void *cls,
enum GNUNET_MQ_Error error)
{
struct GNUNET_CORE_MonitorHandle *mh = cls;
reconnect (mh);
}
/**
* Receive reply from CORE service with information about a peer.
*
* @param cls our `struct GNUNET_CORE_MonitorHandle *`
* @param mon_message monitor message
*/
static void
handle_receive_info (void *cls,
const struct MonitorNotifyMessage *mon_message)
{
struct GNUNET_CORE_MonitorHandle *mh = cls;
mh->peer_cb (mh->peer_cb_cls,
&mon_message->peer,
(enum GNUNET_CORE_KxState) ntohl (mon_message->state),
GNUNET_TIME_absolute_ntoh (mon_message->timeout));
}
/**
* Protocol error, reconnect to CORE service and notify
* client.
*
* @param mh monitoring session to reconnect to CORE
*/
static void
reconnect (struct GNUNET_CORE_MonitorHandle *mh)
{
struct GNUNET_MQ_MessageHandler handlers[] = {
GNUNET_MQ_hd_fixed_size (receive_info,
GNUNET_MESSAGE_TYPE_CORE_MONITOR_NOTIFY,
struct MonitorNotifyMessage,
mh),
GNUNET_MQ_handler_end ()
};
struct GNUNET_MQ_Envelope *env;
struct GNUNET_MessageHeader *msg;
if (NULL != mh->mq)
GNUNET_MQ_destroy (mh->mq);
/* FIXME: use backoff? */
mh->mq = GNUNET_CLIENT_connect (mh->cfg,
"core",
handlers,
&handle_mq_error,
mh);
if (NULL == mh->mq)
return;
/* notify callback about reconnect */
if (NULL != mh->peer_cb)
mh->peer_cb (mh->peer_cb_cls,
NULL,
GNUNET_CORE_KX_CORE_DISCONNECT,
GNUNET_TIME_UNIT_FOREVER_ABS);
env = GNUNET_MQ_msg (msg,
GNUNET_MESSAGE_TYPE_CORE_MONITOR_PEERS);
GNUNET_MQ_send (mh->mq,
env);
}
/**
* Monitor connectivity and KX status of all peers known to CORE.
* Calls @a peer_cb with the current status for each connected peer,
* and then once with NULL to indicate that all peers that are
* currently active have been handled. After that, the iteration
* continues until it is cancelled. Normal users of the CORE API are
* not expected to use this function. It is different in that it
* truly lists all connections (including those where the KX is in
* progress), not just those relevant to the application. This
* function is used by special applications for diagnostics.
*
* @param cfg configuration handle
* @param peer_cb function to call with the peer information
* @param peer_cb_cls closure for @a peer_cb
* @return NULL on error
*/
struct GNUNET_CORE_MonitorHandle *
GNUNET_CORE_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
GNUNET_CORE_MonitorCallback peer_cb,
void *peer_cb_cls)
{
struct GNUNET_CORE_MonitorHandle *mh;
GNUNET_assert (NULL != peer_cb);
mh = GNUNET_new (struct GNUNET_CORE_MonitorHandle);
mh->cfg = cfg;
reconnect (mh);
mh->peer_cb = peer_cb;
mh->peer_cb_cls = peer_cb_cls;
if (NULL == mh->mq)
{
GNUNET_free (mh);
return NULL;
}
return mh;
}
/**
* Stop monitoring CORE activity.
*
* @param mh monitor to stop
*/
void
GNUNET_CORE_monitor_stop (struct GNUNET_CORE_MonitorHandle *mh)
{
if (NULL != mh->mq)
{
GNUNET_MQ_destroy (mh->mq);
mh->mq = NULL;
}
GNUNET_free (mh);
}
/* end of core_api_monitor_peers.c */
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