transport_api_manipulation.c

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/*
     This file is part of GNUnet.
     Copyright (C) 2009-2013, 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
*/

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_arm_service.h"
#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_transport_service.h"
#include "transport.h"

#define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)


struct GNUNET_TRANSPORT_ManipulationHandle
{

  struct GNUNET_MQ_Handle *mq;

  const struct GNUNET_CONFIGURATION_Handle *cfg;

  struct GNUNET_SCHEDULER_Task *reconnect_task;

  struct GNUNET_TIME_Relative reconnect_delay;

  int reconnecting;
};


static void
disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_ManipulationHandle *h);


static void
mq_error_handler (void *cls,
                  enum GNUNET_MQ_Error error)
{
  struct GNUNET_TRANSPORT_ManipulationHandle *h = cls;

  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Error receiving from transport service, disconnecting temporarily.\n");
  h->reconnecting = GNUNET_YES;
  disconnect_and_schedule_reconnect (h);
}


static void
reconnect (void *cls)
{
  struct GNUNET_TRANSPORT_ManipulationHandle *h = cls;
  struct GNUNET_MQ_MessageHandler handlers[] = {
    GNUNET_MQ_handler_end ()
  };
  struct GNUNET_MQ_Envelope *env;
  struct StartMessage *s;

  h->reconnect_task = NULL;
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Connecting to transport service.\n");
  GNUNET_assert (NULL == h->mq);
  h->reconnecting = GNUNET_NO;
  h->mq = GNUNET_CLIENT_connect (h->cfg,
                                 "transport",
                                 handlers,
                                 &mq_error_handler,
                                 h);
  if (NULL == h->mq)
    return;
  env = GNUNET_MQ_msg (s,
                       GNUNET_MESSAGE_TYPE_TRANSPORT_START);
  GNUNET_MQ_send (h->mq,
                  env);
}


static void
disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_ManipulationHandle *h)
{
  GNUNET_assert (NULL == h->reconnect_task);
  if (NULL != h->mq)
  {
    GNUNET_MQ_destroy (h->mq);
    h->mq = NULL;
  }
  h->reconnect_task =
      GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
                                    &reconnect,
                                    h);
  h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
}


void
GNUNET_TRANSPORT_manipulation_set (struct GNUNET_TRANSPORT_ManipulationHandle *handle,
                                   const struct GNUNET_PeerIdentity *peer,
                                   const struct GNUNET_ATS_Properties *prop,
                                   struct GNUNET_TIME_Relative delay_in,
                                   struct GNUNET_TIME_Relative delay_out)
{
  struct GNUNET_MQ_Envelope *env;
  struct TrafficMetricMessage *msg;

  if (NULL == handle->mq)
    return;
  env = GNUNET_MQ_msg (msg,
                       GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
  msg->reserved = htonl (0);
  msg->peer = *peer;
  GNUNET_ATS_properties_hton (&msg->properties,
                              prop);
  msg->delay_in = GNUNET_TIME_relative_hton (delay_in);
  msg->delay_out = GNUNET_TIME_relative_hton (delay_out);
  GNUNET_MQ_send (handle->mq,
                  env);
}


struct GNUNET_TRANSPORT_ManipulationHandle *
GNUNET_TRANSPORT_manipulation_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_TRANSPORT_ManipulationHandle *h;

  h = GNUNET_new (struct GNUNET_TRANSPORT_ManipulationHandle);
  h->cfg = cfg;
  LOG (GNUNET_ERROR_TYPE_DEBUG,
       "Connecting to transport service.\n");
  reconnect (h);
  if (NULL == h->mq)
  {
    GNUNET_free (h);
    return NULL;
  }
  return h;
}


void
GNUNET_TRANSPORT_manipulation_disconnect (struct GNUNET_TRANSPORT_ManipulationHandle *handle)
{
  if (NULL == handle->reconnect_task)
    disconnect_and_schedule_reconnect (handle);
  /* and now we stop trying to connect again... */
  if (NULL != handle->reconnect_task)
  {
    GNUNET_SCHEDULER_cancel (handle->reconnect_task);
    handle->reconnect_task = NULL;
  }
  GNUNET_free (handle);
}


/* end of transport_api_manipulation.c */