/*
This file is part of GNUnet.
- (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Socket (if available).
+ * Message queue (if available).
*/
- struct GNUNET_CLIENT_Connection *client;
-
- /**
- * Currently pending transmission request.
- */
- struct GNUNET_CLIENT_TransmitHandle *th;
+ struct GNUNET_MQ_Handle *mq;
/**
* Task doing exponential back-off trying to reconnect.
*/
- struct GNUNET_SCHEDULER_Task * reconnect_task;
+ struct GNUNET_SCHEDULER_Task *reconnect_task;
/**
* Time for next connect retry.
/**
* Try again to connect to network size estimation service.
*
- * @param cls the handle to the transport service
- * @param tc scheduler context
+ * @param cls closure with the `struct GNUNET_NSE_Handle *`
*/
static void
-reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+reconnect (void *cls);
/**
- * Type of a function to call when we receive a message
- * from the service.
+ * 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
- * @param msg message received, NULL on timeout or fatal error
+ * @param cls closure with the `struct GNUNET_NSE_Handle *`
+ * @param error error code
*/
static void
-message_handler (void *cls, const struct GNUNET_MessageHeader *msg)
+mq_error_handler (void *cls,
+ enum GNUNET_MQ_Error error)
{
struct GNUNET_NSE_Handle *h = cls;
- const struct GNUNET_NSE_ClientMessage *client_msg;
-
- if (NULL == msg)
- {
- /* Error, timeout, death */
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
- h->reconnect_task =
- GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
- &reconnect, h);
- return;
- }
- if ((ntohs (msg->size) != sizeof (struct GNUNET_NSE_ClientMessage)) ||
- (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_NSE_ESTIMATE))
- {
- GNUNET_break (0);
- return;
- }
- client_msg = (const struct GNUNET_NSE_ClientMessage *) msg;
- h->recv_cb (h->recv_cb_cls, GNUNET_TIME_absolute_ntoh (client_msg->timestamp),
- GNUNET_ntoh_double (client_msg->size_estimate),
- GNUNET_ntoh_double (client_msg->std_deviation));
- GNUNET_CLIENT_receive (h->client, &message_handler, h,
- GNUNET_TIME_UNIT_FOREVER_REL);
-}
-
-
-/**
- * Reschedule a connect attempt to the service.
- *
- * @param h transport service to reconnect
- */
-static void
-reschedule_connect (struct GNUNET_NSE_Handle *h)
-{
- GNUNET_assert (h->reconnect_task == NULL);
-
- if (NULL != h->th)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
- h->th = NULL;
- }
- if (NULL != h->client)
- {
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling task to reconnect to nse service in %s.\n",
- GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay,
- GNUNET_YES));
- h->reconnect_task =
- GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
+ 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);
}
/**
- * Transmit START message to service.
+ * Type of a function to call when we receive a message
+ * from the service.
*
- * @param cls the `struct GNUNET_NSE_Handle *`
- * @param size number of bytes available in @a buf
- * @param buf where to copy the message
- * @return number of bytes copied to @a buf
+ * @param cls closure
+ * @param client_msg message received
*/
-static size_t
-send_start (void *cls, size_t size, void *buf)
+static void
+handle_estimate (void *cls,
+ const struct GNUNET_NSE_ClientMessage *client_msg)
{
struct GNUNET_NSE_Handle *h = cls;
- struct GNUNET_MessageHeader *msg;
-
- h->th = NULL;
- if (NULL == buf)
- {
- /* Connect error... */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Error while trying to transmit `%s' request.\n",
- "START");
- reschedule_connect (h);
- return 0;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request.\n",
- "START");
- GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
- msg = (struct GNUNET_MessageHeader *) buf;
- msg->size = htons (sizeof (struct GNUNET_MessageHeader));
- msg->type = htons (GNUNET_MESSAGE_TYPE_NSE_START);
- GNUNET_CLIENT_receive (h->client, &message_handler, h,
- GNUNET_TIME_UNIT_FOREVER_REL);
- return sizeof (struct GNUNET_MessageHeader);
+ h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
+ h->recv_cb (h->recv_cb_cls,
+ GNUNET_TIME_absolute_ntoh (client_msg->timestamp),
+ GNUNET_ntoh_double (client_msg->size_estimate),
+ GNUNET_ntoh_double (client_msg->std_deviation));
}
* Try again to connect to network size estimation service.
*
* @param cls the `struct GNUNET_NSE_Handle *`
- * @param tc scheduler context
*/
static void
-reconnect (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+reconnect (void *cls)
{
struct GNUNET_NSE_Handle *h = cls;
+ struct GNUNET_MQ_MessageHandler handlers[] = {
+ GNUNET_MQ_hd_fixed_size (estimate,
+ GNUNET_MESSAGE_TYPE_NSE_ESTIMATE,
+ struct GNUNET_NSE_ClientMessage,
+ h),
+ GNUNET_MQ_handler_end ()
+ };
+ struct GNUNET_MessageHeader *msg;
+ struct GNUNET_MQ_Envelope *env;
h->reconnect_task = NULL;
LOG (GNUNET_ERROR_TYPE_DEBUG,
"Connecting to network size estimation service.\n");
- GNUNET_assert (NULL == h->client);
- h->client = GNUNET_CLIENT_connect ("nse", h->cfg);
- GNUNET_assert (NULL != h->client);
- GNUNET_assert (NULL == h->th);
- h->th =
- GNUNET_CLIENT_notify_transmit_ready (h->client,
- sizeof (struct GNUNET_MessageHeader),
- GNUNET_TIME_UNIT_FOREVER_REL,
- GNUNET_NO, &send_start, h);
- GNUNET_assert (NULL != h->th);
+ GNUNET_assert (NULL == h->mq);
+ h->mq = GNUNET_CLIENT_connect (h->cfg,
+ "nse",
+ handlers,
+ &mq_error_handler,
+ h);
+ if (NULL == h->mq)
+ return;
+ env = GNUNET_MQ_msg (msg,
+ GNUNET_MESSAGE_TYPE_NSE_START);
+ GNUNET_MQ_send (h->mq,
+ env);
}
*/
struct GNUNET_NSE_Handle *
GNUNET_NSE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_NSE_Callback func, void *func_cls)
+ GNUNET_NSE_Callback func,
+ void *func_cls)
{
- struct GNUNET_NSE_Handle *ret;
-
- GNUNET_assert (func != NULL);
- ret = GNUNET_new (struct GNUNET_NSE_Handle);
- ret->cfg = cfg;
- ret->recv_cb = func;
- ret->recv_cb_cls = func_cls;
- ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
- ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
- return ret;
+ struct GNUNET_NSE_Handle *h;
+
+ GNUNET_assert (NULL != func);
+ h = GNUNET_new (struct GNUNET_NSE_Handle);
+ h->cfg = cfg;
+ h->recv_cb = func;
+ h->recv_cb_cls = func_cls;
+ h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
+ reconnect (h);
+ if (NULL == h->mq)
+ {
+ GNUNET_free (h);
+ return NULL;
+ }
+ return h;
}
void
GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h)
{
- GNUNET_assert (NULL != h);
- if (h->reconnect_task != NULL)
+ if (NULL != h->reconnect_task)
{
GNUNET_SCHEDULER_cancel (h->reconnect_task);
h->reconnect_task = NULL;
}
- if (NULL != h->th)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
- h->th = NULL;
- }
- if (NULL != h->client)
+ if (NULL != h->mq)
{
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
}
GNUNET_free (h);
}