/*
This file is part of GNUnet.
- (C) 2009 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010 Christian Grothoff (and other contributing authors)
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
*/
#include "platform.h"
#include "gnunet_client_lib.h"
+#include "gnunet_constants.h"
#include "gnunet_container_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_server_lib.h"
{
ACTION_GET,
ACTION_SET,
- ACTION_UPDATE
+ ACTION_UPDATE,
+ ACTION_WATCH
+};
+
+
+/**
+ * Entry kept for each value we are watching.
+ */
+struct GNUNET_STATISTICS_WatchEntry
+{
+
+ /**
+ * What subsystem is this action about? (never NULL)
+ */
+ char *subsystem;
+
+ /**
+ * What value is this action about? (never NULL)
+ */
+ char *name;
+
+ /**
+ * Function to call
+ */
+ GNUNET_STATISTICS_Iterator proc;
+
+ /**
+ * Closure for proc
+ */
+ void *proc_cls;
+
};
int aborted;
/**
- * Is this a GET, SET or UPDATE?
+ * Is this a GET, SET, UPDATE or WATCH?
*/
enum ActionType type;
*/
struct GNUNET_STATISTICS_Handle
{
- /**
- * Our scheduler.
- */
- struct GNUNET_SCHEDULER_Handle *sched;
-
/**
* Name of our subsystem.
*/
*/
struct GNUNET_STATISTICS_GetHandle *current;
+ /**
+ * Array of watch entries.
+ */
+ struct GNUNET_STATISTICS_WatchEntry **watches;
+
+ /**
+ * Task doing exponential back-off trying to reconnect.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier backoff_task;
+
+ /**
+ * Time for next connect retry.
+ */
+ struct GNUNET_TIME_Relative backoff;
+
+ /**
+ * Size of the 'watches' array.
+ */
+ unsigned int watches_size;
+
/**
* Should this handle auto-destruct once all actions have
* been processed?
*/
int do_destroy;
+ /**
+ * Are we currently receiving from the service?
+ */
+ int receiving;
+
};
+
+/**
+ * Schedule the next action to be performed.
+ */
+static void schedule_action (struct GNUNET_STATISTICS_Handle *h);
+
+/**
+ * Try to (re)connect to the statistics service.
+ *
+ * @return GNUNET_YES on success, GNUNET_NO on failure.
+ */
+static int
+try_connect (struct GNUNET_STATISTICS_Handle *ret);
+
+
+static void
+insert_ai (struct GNUNET_STATISTICS_Handle *h, struct GNUNET_STATISTICS_GetHandle *ai)
+{
+ GNUNET_CONTAINER_DLL_insert_after (h->action_head,
+ h->action_tail,
+ h->action_tail,
+ ai);
+ if (h->action_head == ai)
+ schedule_action (h);
+}
+
+
+static void
+schedule_watch_request (struct GNUNET_STATISTICS_Handle *h,
+ struct GNUNET_STATISTICS_WatchEntry *watch)
+{
+
+ struct GNUNET_STATISTICS_GetHandle *ai;
+ size_t slen;
+ size_t nlen;
+ size_t nsize;
+
+ GNUNET_assert (h != NULL);
+ if (GNUNET_YES != try_connect (h))
+ {
+ schedule_action (h);
+ return;
+ }
+ slen = strlen (watch->subsystem) + 1;
+ nlen = strlen (watch->name) + 1;
+ nsize = sizeof (struct GNUNET_MessageHeader) + slen + nlen;
+ if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
+ ai->sh = h;
+ ai->subsystem = GNUNET_strdup (watch->subsystem);
+ ai->name = GNUNET_strdup (watch->name);
+ ai->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
+ ai->msize = nsize;
+ ai->type = ACTION_WATCH;
+ ai->proc = watch->proc;
+ ai->cls = watch->proc_cls;
+ insert_ai (h, ai);
+}
+
+
/**
* Try to (re)connect to the statistics service.
*
static int
try_connect (struct GNUNET_STATISTICS_Handle *ret)
{
+ unsigned int i;
if (ret->client != NULL)
return GNUNET_YES;
- ret->client = GNUNET_CLIENT_connect (ret->sched, "statistics", ret->cfg);
+ ret->client = GNUNET_CLIENT_connect ("statistics", ret->cfg);
if (ret->client != NULL)
- return GNUNET_YES;
+ {
+ for (i=0;i<ret->watches_size;i++)
+ schedule_watch_request (ret, ret->watches[i]);
+ return GNUNET_YES;
+ }
#if DEBUG_STATISTICS
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
_("Failed to connect to statistics service!\n"));
}
-/**
- * Schedule the next action to be performed.
- */
-static void schedule_action (struct GNUNET_STATISTICS_Handle *h);
-
-
/**
* GET processing is complete, tell client about it.
*/
uint16_t size;
if (h->current->aborted)
- return GNUNET_OK; /* don't bother */
+ {
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Iteration was aborted, ignoring VALUE\n");
+#endif
+ return GNUNET_OK; /* don't bother */
+ }
size = ntohs (msg->size);
if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
{
#endif
h->current->aborted = GNUNET_YES;
}
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "VALUE processed successfully\n");
+#endif
+ return GNUNET_OK;
+}
+
+
+static int
+process_watch_value (struct GNUNET_STATISTICS_Handle *h,
+ const struct GNUNET_MessageHeader *msg)
+{
+ const struct GNUNET_STATISTICS_WatchValueMessage *wvm;
+ struct GNUNET_STATISTICS_WatchEntry *w;
+ uint32_t wid;
+
+ if (sizeof(struct GNUNET_STATISTICS_WatchValueMessage) !=
+ ntohs (msg->size))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ wvm = (const struct GNUNET_STATISTICS_WatchValueMessage *)msg;
+ GNUNET_break (0 == ntohl (wvm->reserved));
+ wid = ntohl (wvm->wid);
+ if (wid >= h->watches_size)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ w = h->watches[wid];
+ (void) w->proc (w->proc_cls,
+ w->subsystem,
+ w->name,
+ GNUNET_ntohll (wvm->value),
+ 0 !=
+ (ntohl (wvm->flags) & GNUNET_STATISTICS_PERSIST_BIT));
return GNUNET_OK;
}
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received end of statistics marker\n");
#endif
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ if (h->watches_size > 0)
+ {
+ GNUNET_CLIENT_receive (h->client,
+ &receive_stats,
+ h,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ }
+ else
+ {
+ h->receiving = GNUNET_NO;
+ }
finish (h, GNUNET_OK);
return;
case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
if (GNUNET_OK == process_message (h, msg))
{
/* finally, look for more! */
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing VALUE done, now reading more\n");
+#endif
GNUNET_CLIENT_receive (h->client,
&receive_stats,
h,
GNUNET_TIME_absolute_get_remaining
(h->current->timeout));
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
return;
}
GNUNET_break (0);
break;
+ case GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE:
+ if (GNUNET_OK ==
+ process_watch_value (h,
+ msg))
+ {
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ GNUNET_assert (h->watches_size > 0);
+ GNUNET_CLIENT_receive (h->client,
+ &receive_stats,
+ h,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ return;
+ }
+ GNUNET_break (0);
+ break;
default:
GNUNET_break (0);
break;
2,
handle->current->subsystem,
handle->current->name));
- GNUNET_CLIENT_receive (handle->client,
- &receive_stats,
- handle,
- GNUNET_TIME_absolute_get_remaining (handle->
- current->timeout));
+ if (! handle->receiving)
+ {
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of GET done, now reading response\n");
+#endif
+ handle->receiving = GNUNET_YES;
+ GNUNET_CLIENT_receive (handle->client,
+ &receive_stats,
+ handle,
+ GNUNET_TIME_absolute_get_remaining (handle->
+ current->timeout));
+ }
return msize;
}
+/**
+ * Transmit a WATCH request (and if successful, start to receive
+ * the response).
+ */
+static size_t
+transmit_watch (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
+{
+ struct GNUNET_MessageHeader *hdr;
+ size_t slen1;
+ size_t slen2;
+ uint16_t msize;
+
+ if (buf == NULL)
+ {
+ /* timeout / error */
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of request for statistics failed!\n");
+#endif
+ finish (handle, GNUNET_SYSERR);
+ return 0;
+ }
+#if DEBUG_STATISTICS
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting watch request for `%s'\n",
+ handle->current->name);
+#endif
+ slen1 = strlen (handle->current->subsystem) + 1;
+ slen2 = strlen (handle->current->name) + 1;
+ msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
+ GNUNET_assert (msize <= size);
+ hdr = (struct GNUNET_MessageHeader *) buf;
+ hdr->size = htons (msize);
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_WATCH);
+ GNUNET_assert (slen1 + slen2 ==
+ GNUNET_STRINGS_buffer_fill ((char *) &hdr[1],
+ slen1 + slen2,
+ 2,
+ handle->current->subsystem,
+ handle->current->name));
+ if (GNUNET_YES != handle->receiving)
+ {
+ handle->receiving = GNUNET_YES;
+ GNUNET_CLIENT_receive (handle->client,
+ &receive_stats,
+ handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ }
+ finish (handle, GNUNET_OK);
+ return msize;
+}
+
/**
* Transmit a SET/UPDATE request.
case ACTION_UPDATE:
ret = transmit_set (handle, size, buf);
break;
+ case ACTION_WATCH:
+ ret = transmit_watch (handle, size, buf);
+ break;
default:
ret = 0;
GNUNET_break (0);
/**
* Get handle for the statistics service.
*
- * @param sched scheduler to use
* @param subsystem name of subsystem using the service
* @param cfg services configuration in use
* @return handle to use
*/
struct GNUNET_STATISTICS_Handle *
-GNUNET_STATISTICS_create (struct GNUNET_SCHEDULER_Handle *sched,
- const char *subsystem,
+GNUNET_STATISTICS_create (const char *subsystem,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
struct GNUNET_STATISTICS_Handle *ret;
GNUNET_assert (subsystem != NULL);
- GNUNET_assert (sched != NULL);
GNUNET_assert (cfg != NULL);
ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
- ret->sched = sched;
ret->cfg = cfg;
ret->subsystem = GNUNET_strdup (subsystem);
- try_connect (ret);
+ ret->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ if (GNUNET_YES != try_connect (ret))
+ {
+ GNUNET_free (ret->subsystem);
+ GNUNET_free (ret);
+ return NULL;
+ }
return ret;
}
struct GNUNET_STATISTICS_GetHandle *next;
struct GNUNET_STATISTICS_GetHandle *prev;
struct GNUNET_TIME_Relative timeout;
+ int i;
+ if (h == NULL) return;
+ if (GNUNET_SCHEDULER_NO_TASK != h->backoff_task)
+ GNUNET_SCHEDULER_cancel (h->backoff_task);
if (sync_first)
{
if (h->current != NULL)
GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
h->client = NULL;
}
+ for (i=0;i<h->watches_size;i++)
+ {
+ GNUNET_free (h->watches[i]->subsystem);
+ GNUNET_free (h->watches[i]->name);
+ GNUNET_free (h->watches[i]);
+ }
+ GNUNET_array_grow (h->watches,
+ h->watches_size,
+ 0);
GNUNET_free (h->subsystem);
GNUNET_free (h);
}
+static void
+finish_task (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_STATISTICS_Handle *h = cls;
+
+ h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
+ finish (h, GNUNET_SYSERR);
+}
+
/**
* Schedule the next action to be performed.
return; /* action already pending */
if (GNUNET_YES != try_connect (h))
{
- finish (h, GNUNET_SYSERR);
+ h->backoff_task = GNUNET_SCHEDULER_add_delayed (h->backoff,
+ &finish_task,
+ h);
+ h->backoff = GNUNET_TIME_relative_multiply (h->backoff, 2);
+ h->backoff = GNUNET_TIME_relative_min (h->backoff,
+ GNUNET_CONSTANTS_SERVICE_TIMEOUT);
return;
}
}
-static void
-insert_ai (struct GNUNET_STATISTICS_Handle *h, struct GNUNET_STATISTICS_GetHandle *ai)
-{
- GNUNET_CONTAINER_DLL_insert_after (h->action_head,
- h->action_tail,
- h->action_tail,
- ai);
- if (h->action_head == ai)
- schedule_action (h);
-}
-
-
/**
* Get statistic from the peer.
*
}
+/**
+ * Watch statistics from the peer (be notified whenever they change).
+ * Note that the only way to cancel a "watch" request is to destroy
+ * the statistics handle given as the first argument to this call.
+ *
+ * @param handle identification of the statistics service
+ * @param subsystem limit to the specified subsystem, never NULL
+ * @param name name of the statistic value, never NULL
+ * @param proc function to call on each value
+ * @param proc_cls closure for proc
+ * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ */
+int
+GNUNET_STATISTICS_watch (struct GNUNET_STATISTICS_Handle *handle,
+ const char *subsystem,
+ const char *name,
+ GNUNET_STATISTICS_Iterator proc,
+ void *proc_cls)
+{
+ struct GNUNET_STATISTICS_WatchEntry *w;
+
+ if (handle == NULL)
+ return GNUNET_SYSERR;
+ w = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_WatchEntry));
+ w->subsystem = GNUNET_strdup (subsystem);
+ w->name = GNUNET_strdup (name);
+ w->proc = proc;
+ w->proc_cls = proc_cls;
+ GNUNET_array_append (handle->watches,
+ handle->watches_size,
+ w);
+ schedule_watch_request (handle, w);
+ return GNUNET_OK;
+}
+
+
static void
add_setter_action (struct GNUNET_STATISTICS_Handle *h,
const char *name,
ai->type = type;
}
}
- ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
+ ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
+ ai->make_persistent = make_persistent;
return;
}
ai = ai->next;
ai->value = value;
ai->type = type;
insert_ai (h, ai);
- schedule_action (h);
}
projects / oweals / gnunet.git / blobdiff