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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/>.
*/
/**
* @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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