/*
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.
*/
/**
* @file nse/nse_api.c
* @brief api to get information from the network size estimation service
* @author Nathan Evans
- *
- * TODO:
*/
#include "platform.h"
-#include "gnunet_client_lib.h"
#include "gnunet_constants.h"
-#include "gnunet_container_lib.h"
#include "gnunet_arm_service.h"
#include "gnunet_hello_lib.h"
#include "gnunet_protocols.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_time_lib.h"
+#include "gnunet_util_lib.h"
#include "gnunet_nse_service.h"
#include "nse.h"
+#define LOG(kind,...) GNUNET_log_from (kind, "nse-api",__VA_ARGS__)
/**
- * Handle for the service.
+ * Handle for talking with the NSE service.
*/
struct GNUNET_NSE_Handle
{
const struct GNUNET_CONFIGURATION_Handle *cfg;
/**
- * Socket (if available).
- */
- struct GNUNET_CLIENT_Connection *client;
-
- /**
- * Currently pending transmission request.
+ * Message queue (if available).
*/
- struct GNUNET_CLIENT_TransmitHandle *th;
+ struct GNUNET_MQ_Handle *mq;
/**
* Task doing exponential back-off trying to reconnect.
*/
- GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
+ struct GNUNET_SCHEDULER_Task *reconnect_task;
/**
* Time for next connect retry.
*/
struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Should this handle auto-destruct once all actions have
- * been processed?
- */
- int do_destroy;
-
- /**
- * Are we currently receiving from the service?
- */
- int receiving;
-
/**
* Callback function to call when message is received.
*/
GNUNET_NSE_Callback recv_cb;
/**
- * Closure to pass to callback.
+ * Closure to pass to @e recv_cb callback.
*/
void *recv_cb_cls;
/**
- * Type of a function to call when we receive a message
- * from the service.
+ * Try again to connect to network size estimation service.
*
- * @param cls closure
- * @param msg message received, NULL on timeout or fatal error
+ * @param cls closure with the `struct GNUNET_NSE_Handle *`
*/
-void message_handler (void *cls,
- const struct GNUNET_MessageHeader * msg)
-{
- struct GNUNET_NSE_Handle *h = cls;
- struct GNUNET_NSE_ClientMessage *client_msg;
-
- if ((ntohs (msg->size) < sizeof(struct GNUNET_NSE_ClientMessage))
- || (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_NSE_ESTIMATE))
- {
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "%s: received incorrect message (size %d < %d) from service!",
- "NSE API", ntohs (msg->size),
- sizeof(struct GNUNET_NSE_ClientMessage));
-#endif
- return;
- }
-
- client_msg = (struct GNUNET_NSE_ClientMessage *)msg;
-
- h->recv_cb (h->recv_cb_cls, client_msg->size_estimate,
- client_msg->std_deviation);
-
- GNUNET_CLIENT_receive (h->client,
- &message_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
-}
-
static void
-reconnect (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
+reconnect (void *cls);
+
/**
- * Reschedule a connect attempt to 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 h transport service to reconnect
+ * @param cls closure with the `struct GNUNET_NSE_Handle *`
+ * @param error error code
*/
static void
-reschedule_connect (struct GNUNET_NSE_Handle *h)
+mq_error_handler (void *cls,
+ enum GNUNET_MQ_Error error)
{
- GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
-
- if (NULL != h->th)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
- h->th = NULL;
- }
- if (NULL != h->client)
- {
- GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
- h->client = NULL;
- }
+ struct GNUNET_NSE_Handle *h = cls;
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling task to reconnect to nse service in %llu ms.\n",
- h->reconnect_delay.rel_value);
-#endif
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
h->reconnect_task
= GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
- &reconnect, h);
- if (h->reconnect_delay.rel_value == 0)
- {
- h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
- }
- else
- {
- h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
- h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
- 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 unused
- * @param size number of bytes available in buf
- * @param buf where to copy the message
- * @return number of bytes copied to 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 (buf == NULL)
- {
- /* Connect error... */
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Shutdown while trying to transmit `%s' request.\n",
- "START");
-#endif
- reschedule_connect(h);
- return 0;
- }
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Transmitting `%s' request.\n", "START");
-#endif
- 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 handle to the transport service
- * @param tc scheduler context
+ * @param cls the `struct GNUNET_NSE_Handle *`
*/
static void
-reconnect (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+reconnect (void *cls)
{
struct GNUNET_NSE_Handle *h = cls;
-
- h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- {
- /* shutdown, just give up */
- return;
- }
-#if DEBUG_NSE
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Connecting to network size estimation service.\n");
-#endif
- GNUNET_assert (h->client == NULL);
- h->client = GNUNET_CLIENT_connect ("nse", h->cfg);
- GNUNET_assert (h->client != NULL);
-
- 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(h->th != NULL);
+ 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->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);
}
+
/**
* Connect to the network size estimation service.
*
* @param cfg the configuration to use
* @param func funtion to call with network size estimate
- * @param func_cls closure to pass for network size estimate callback
- *
+ * @param func_cls closure to pass to @a func
* @return handle to use
*/
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;
-
- ret = GNUNET_malloc (sizeof (struct GNUNET_NSE_Handle));
-
- if (func == NULL)
+ 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;
-
- 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;
+ }
+ return h;
}
+
/**
* Disconnect from network size estimation service
*
* @param h handle to destroy
- *
*/
void
GNUNET_NSE_disconnect (struct GNUNET_NSE_Handle *h)
{
- GNUNET_assert(h != NULL);
- if (h->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel(h->reconnect_task);
- h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (h->th != NULL)
- GNUNET_CLIENT_notify_transmit_ready_cancel(h->th);
- if (h->client != NULL)
- GNUNET_CLIENT_disconnect(h->client, GNUNET_NO);
-
- GNUNET_free(h);
+ if (NULL != h->reconnect_task)
+ {
+ GNUNET_SCHEDULER_cancel (h->reconnect_task);
+ h->reconnect_task = NULL;
+ }
+ if (NULL != h->mq)
+ {
+ GNUNET_MQ_destroy (h->mq);
+ h->mq = NULL;
+ }
+ GNUNET_free (h);
}
+
+/* end of nse_api.c */
projects / oweals / gnunet.git / blobdiff