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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
- */
- /**
- * @file transport/transport_api_manipulation.c
- * @brief library to access the low-level P2P IO service
- * @author Christian Grothoff
- */
- #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__)
- /**
- * Handle for the transport service (includes all of the
- * state for the transport service).
- */
- struct GNUNET_TRANSPORT_ManipulationHandle
- {
- /**
- * My client connection to the transport service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * My configuration.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * ID of the task trying to reconnect to the service.
- */
- struct GNUNET_SCHEDULER_Task *reconnect_task;
- /**
- * Delay until we try to reconnect.
- */
- struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Reconnect in progress
- */
- int reconnecting;
- };
- /**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param h transport service to reconnect
- */
- static void
- disconnect_and_schedule_reconnect (struct
- GNUNET_TRANSPORT_ManipulationHandle *h);
- /**
- * 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 with the `struct GNUNET_TRANSPORT_ManipulationHandle *`
- * @param error error code
- */
- 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);
- }
- /**
- * Try again to connect to transport service.
- *
- * @param cls the handle to the transport service
- */
- 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);
- }
- /**
- * Function that will schedule the job that will try
- * to connect us again to the client.
- *
- * @param h transport service to reconnect
- */
- 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);
- }
- /**
- * Set transport metrics for a peer and a direction.
- *
- * @param handle transport handle
- * @param peer the peer to set the metric for
- * @param prop the performance metrics to set
- * @param delay_in inbound delay to introduce
- * @param delay_out outbound delay to introduce
- *
- * Note: Delay restrictions in receiving direction will be enforced
- * with one message 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);
- }
- /**
- * Connect to the transport service. Note that the connection may
- * complete (or fail) asynchronously.
- *
- * @param cfg configuration to use
- * @return NULL on error
- */
- 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;
- }
- /**
- * Disconnect from the transport service.
- *
- * @param handle handle to the service as returned from #GNUNET_TRANSPORT_manipulation_connect()
- */
- 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 */
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