/*
This file is part of GNUnet.
- (C) 2009 Christian Grothoff (and other contributing authors)
+ (C) 2009, 2010, 2011 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"
#include "gnunet_statistics_service.h"
#include "gnunet_strings_lib.h"
#include "statistics.h"
-#define SET_TRANSMIT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
+/**
+ * How long do we wait until a statistics request for setting
+ * a value times out? (The update will be lost if the
+ * service does not react within this timeframe).
+ */
+#define SET_TRANSMIT_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
+#define LOG(kind,...) GNUNET_log_from (kind, "statistics-api",__VA_ARGS__)
/**
* Types of actions.
*/
enum ActionType
{
+ /**
+ * Get a value.
+ */
ACTION_GET,
+
+ /**
+ * Set a value.
+ */
ACTION_SET,
- ACTION_UPDATE
+
+ /**
+ * Update a value.
+ */
+ ACTION_UPDATE,
+
+ /**
+ * Watch a value.
+ */
+ 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;
+
};
/**
* Linked list of things we still need to do.
*/
-struct ActionItem
+struct GNUNET_STATISTICS_GetHandle
{
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct GNUNET_STATISTICS_GetHandle *next;
+
/**
- * This is a linked list.
+ * This is a doubly linked list.
*/
- struct ActionItem *next;
+ struct GNUNET_STATISTICS_GetHandle *prev;
+
+ /**
+ * Main statistics handle.
+ */
+ struct GNUNET_STATISTICS_Handle *sh;
/**
* What subsystem is this action about? (can be NULL)
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.
*/
* Head of the linked list of pending actions (first action
* to be performed).
*/
- struct ActionItem *action_head;
+ struct GNUNET_STATISTICS_GetHandle *action_head;
/**
* Tail of the linked list of actions (for fast append).
*/
- struct ActionItem *action_tail;
+ struct GNUNET_STATISTICS_GetHandle *action_tail;
/**
* Action we are currently busy with (action request has been
* transmitted, we're now receiving the response from the
* service).
*/
- struct ActionItem *current;
+ 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;
};
/**
- * Try to (re)connect to the statistics service.
+ * Schedule the next action to be performed.
*
- * @return GNUNET_YES on success, GNUNET_NO on failure.
+ * @param h statistics handle to reconnect
*/
-static int
-try_connect (struct GNUNET_STATISTICS_Handle *ret)
+static void
+schedule_action (struct GNUNET_STATISTICS_Handle *h);
+
+
+/**
+ * Transmit request to service that we want to watch
+ * the development of a particular value.
+ *
+ * @param h statistics handle
+ * @param watch watch entry of the value to watch
+ */
+static void
+schedule_watch_request (struct GNUNET_STATISTICS_Handle *h,
+ struct GNUNET_STATISTICS_WatchEntry *watch)
{
- if (ret->client != NULL)
- return GNUNET_OK;
- ret->client = GNUNET_CLIENT_connect (ret->sched, "statistics", ret->cfg);
- if (ret->client != NULL)
- return GNUNET_YES;
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Failed to connect to statistics service!\n"));
-#endif
- return GNUNET_NO;
+
+ struct GNUNET_STATISTICS_GetHandle *ai;
+ size_t slen;
+ size_t nlen;
+ size_t nsize;
+
+ GNUNET_assert (h != NULL);
+ 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;
+ GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
+ ai);
+ schedule_action (h);
}
/**
* Free memory associated with the given action item.
+ *
+ * @param gh action item to free
*/
static void
-free_action_item (struct ActionItem *ai)
+free_action_item (struct GNUNET_STATISTICS_GetHandle *gh)
{
- GNUNET_free_non_null (ai->subsystem);
- GNUNET_free_non_null (ai->name);
- GNUNET_free (ai);
+ GNUNET_free_non_null (gh->subsystem);
+ GNUNET_free_non_null (gh->name);
+ GNUNET_free (gh);
}
/**
- * Get handle for the statistics service.
+ * Disconnect from 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
+ * @param h statistics handle to disconnect from
*/
-struct GNUNET_STATISTICS_Handle *
-GNUNET_STATISTICS_create (struct GNUNET_SCHEDULER_Handle *sched,
- const char *subsystem,
- const struct GNUNET_CONFIGURATION_Handle *cfg)
+static void
+do_disconnect (struct GNUNET_STATISTICS_Handle *h)
{
- 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);
- return ret;
+ struct GNUNET_STATISTICS_GetHandle *c;
+
+ 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;
+ }
+ h->receiving = GNUNET_NO;
+ if (NULL != (c = h->current))
+ {
+ h->current = NULL;
+ if (c->cont != NULL)
+ c->cont (c->cls, GNUNET_SYSERR);
+ free_action_item (c);
+ }
}
/**
- * Destroy a handle (free all state associated with
- * it).
+ * Try to (re)connect to the statistics service.
+ *
+ * @param h statistics handle to reconnect
+ * @return GNUNET_YES on success, GNUNET_NO on failure.
*/
-void
-GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *h)
+static int
+try_connect (struct GNUNET_STATISTICS_Handle *h)
{
- struct ActionItem *pos;
- if (NULL != h->th)
- {
- GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
- h->th = NULL;
- }
- if (h->current != NULL)
- free_action_item (h->current);
- while (NULL != (pos = h->action_head))
- {
- h->action_head = pos->next;
- free_action_item (pos);
- }
+ struct GNUNET_STATISTICS_GetHandle *gh;
+ struct GNUNET_STATISTICS_GetHandle *gn;
+ unsigned int i;
+
+ if (h->backoff_task != GNUNET_SCHEDULER_NO_TASK)
+ return GNUNET_NO;
+ if (h->client != NULL)
+ return GNUNET_YES;
+ h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
if (h->client != NULL)
+ {
+ gn = h->action_head;
+ while (NULL != (gh = gn))
{
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
+ gn = gh->next;
+ if (gh->type == ACTION_WATCH)
+ {
+ GNUNET_CONTAINER_DLL_remove (h->action_head,
+ h->action_tail,
+ gh);
+ free_action_item (gh);
+ }
}
- GNUNET_free (h->subsystem);
- GNUNET_free (h);
+ for (i = 0; i < h->watches_size; i++)
+ schedule_watch_request (h, h->watches[i]);
+ return GNUNET_YES;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to connect to statistics service!\n");
+ return GNUNET_NO;
}
/**
- * Process the message.
+ * We've waited long enough, reconnect now.
*
+ * @param cls the 'struct GNUNET_STATISTICS_Handle' to reconnect
+ * @param tc scheduler context (unused)
+ */
+static void
+reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct GNUNET_STATISTICS_Handle *h = cls;
+
+ h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
+ schedule_action (h);
+}
+
+
+/**
+ * Reconnect at a later time, respecting back-off.
+ *
+ * @param h statistics handle
+ */
+static void
+reconnect_later (struct GNUNET_STATISTICS_Handle *h)
+{
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == h->backoff_task);
+ if (h->do_destroy)
+ {
+ /* So we are shutting down and the service is not reachable.
+ * Chances are that it's down for good and we are not going to connect to
+ * it anymore.
+ * Give up and don't sync the rest of the data.
+ */
+ GNUNET_break (0);
+ h->do_destroy = GNUNET_NO;
+ GNUNET_STATISTICS_destroy (h, GNUNET_NO);
+ return;
+ }
+ h->backoff_task =
+ GNUNET_SCHEDULER_add_delayed (h->backoff, &reconnect_task, h);
+ h->backoff = GNUNET_TIME_relative_multiply (h->backoff, 2);
+ h->backoff =
+ GNUNET_TIME_relative_min (h->backoff, GNUNET_CONSTANTS_SERVICE_TIMEOUT);
+}
+
+
+/**
+ * Process a 'GNUNET_MESSAGE_TYPE_STATISTICS_VALUE' message.
+ *
+ * @param h statistics handle
+ * @param msg message received from the service, never NULL
* @return GNUNET_OK if the message was well-formed
*/
static int
-process_message (struct GNUNET_STATISTICS_Handle *h,
- const struct GNUNET_MessageHeader *msg)
+process_statistics_value_message (struct GNUNET_STATISTICS_Handle *h,
+ const struct GNUNET_MessageHeader *msg)
{
char *service;
char *name;
uint16_t size;
if (h->current->aborted)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Iteration was aborted, ignoring VALUE\n");
return GNUNET_OK; /* don't bother */
+ }
size = ntohs (msg->size);
if (size < sizeof (struct GNUNET_STATISTICS_ReplyMessage))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
smsg = (const struct GNUNET_STATISTICS_ReplyMessage *) msg;
size -= sizeof (struct GNUNET_STATISTICS_ReplyMessage);
- if (size != GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1],
- size, 2, &service, &name))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received valid statistic on `%s:%s': %llu\n",
- service, name, GNUNET_ntohll (smsg->value));
-#endif
+ if (size !=
+ GNUNET_STRINGS_buffer_tokenize ((const char *) &smsg[1], size, 2,
+ &service, &name))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Received valid statistic on `%s:%s': %llu\n",
+ service, name, GNUNET_ntohll (smsg->value));
if (GNUNET_OK !=
- h->current->proc (h->current->cls,
- service,
- name,
+ h->current->proc (h->current->cls, service, name,
GNUNET_ntohll (smsg->value),
0 !=
(ntohl (smsg->uid) & GNUNET_STATISTICS_PERSIST_BIT)))
- {
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Processing of remaining statistics aborted by client.\n");
-#endif
- h->current->aborted = GNUNET_YES;
- }
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing of remaining statistics aborted by client.\n");
+ h->current->aborted = GNUNET_YES;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "VALUE processed successfully\n");
return GNUNET_OK;
}
-
/**
- * Schedule the next action to be performed.
- */
-static void schedule_action (struct GNUNET_STATISTICS_Handle *h);
-
-
-/**
- * GET processing is complete, tell client about it.
+ * We have received a watch value from the service. Process it.
+ *
+ * @param h statistics handle
+ * @param msg the watch value message
+ * @return GNUNET_OK if the message was well-formed, GNUNET_SYSERR if not,
+ * GNUNET_NO if this watch has been cancelled
*/
-static void
-finish (struct GNUNET_STATISTICS_Handle *h, int code)
+static int
+process_watch_value (struct GNUNET_STATISTICS_Handle *h,
+ const struct GNUNET_MessageHeader *msg)
{
- struct ActionItem *pos = h->current;
- h->current = NULL;
- schedule_action (h);
- if (pos->cont != NULL)
- pos->cont (pos->cls, code);
- free_action_item (pos);
+ 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];
+ if (NULL == w)
+ return GNUNET_NO;
+ (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;
}
receive_stats (void *cls, const struct GNUNET_MessageHeader *msg)
{
struct GNUNET_STATISTICS_Handle *h = cls;
+ struct GNUNET_STATISTICS_GetHandle *c;
+ int ret;
if (msg == NULL)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
+ "Error receiving statistics from service, is the service running?\n");
+ do_disconnect (h);
+ reconnect_later (h);
+ return;
+ }
+ switch (ntohs (msg->type))
+ {
+ case GNUNET_MESSAGE_TYPE_STATISTICS_END:
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Received end of statistics marker\n");
+ if (NULL == (c = h->current))
{
- if (NULL != h->client)
- {
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
- }
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG | GNUNET_ERROR_TYPE_BULK,
- "Error receiving statistics from service, is the service running?\n" );
-#endif
- finish (h, GNUNET_SYSERR);
+ GNUNET_break (0);
+ do_disconnect (h);
+ reconnect_later (h);
return;
}
- switch (ntohs (msg->type))
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ if (h->watches_size > 0)
{
- case GNUNET_MESSAGE_TYPE_STATISTICS_END:
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received end of statistics marker\n");
-#endif
- finish (h, GNUNET_OK);
- return;
- case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
- if (GNUNET_OK == process_message (h, msg))
- {
- /* finally, look for more! */
- GNUNET_CLIENT_receive (h->client,
- &receive_stats,
- h,
- GNUNET_TIME_absolute_get_remaining
- (h->current->timeout));
- return;
- }
- GNUNET_break (0);
- break;
- default:
- GNUNET_break (0);
- break;
+ GNUNET_CLIENT_receive (h->client, &receive_stats, h,
+ GNUNET_TIME_UNIT_FOREVER_REL);
}
- if (NULL != h->client)
+ else
{
- GNUNET_CLIENT_disconnect (h->client);
- h->client = NULL;
+ h->receiving = GNUNET_NO;
+ }
+ h->current = NULL;
+ schedule_action (h);
+ if (c->cont != NULL)
+ c->cont (c->cls, GNUNET_OK);
+ free_action_item (c);
+ return;
+ case GNUNET_MESSAGE_TYPE_STATISTICS_VALUE:
+ if (GNUNET_OK != process_statistics_value_message (h, msg))
+ {
+ do_disconnect (h);
+ reconnect_later (h);
+ return;
+ }
+ /* finally, look for more! */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Processing VALUE done, now reading more\n");
+ GNUNET_CLIENT_receive (h->client, &receive_stats, h,
+ GNUNET_TIME_absolute_get_remaining (h->
+ current->timeout));
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ return;
+ case GNUNET_MESSAGE_TYPE_STATISTICS_WATCH_VALUE:
+ if (GNUNET_OK !=
+ (ret = process_watch_value (h, msg)))
+ {
+ do_disconnect (h);
+ if (GNUNET_NO == ret)
+ h->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ reconnect_later (h);
+ return;
}
- finish (h, GNUNET_SYSERR);
+ 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;
+ default:
+ GNUNET_break (0);
+ do_disconnect (h);
+ reconnect_later (h);
+ return;
+ }
}
/**
* Transmit a GET request (and if successful, start to receive
* the response).
+ *
+ * @param handle statistics handle
+ * @param size how many bytes can we write to buf
+ * @param buf where to write requests to the service
+ * @return number of bytes written to buf
*/
static size_t
transmit_get (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
{
+ struct GNUNET_STATISTICS_GetHandle *c;
struct GNUNET_MessageHeader *hdr;
size_t slen1;
size_t slen2;
uint16_t msize;
+ GNUNET_assert (NULL != (c = handle->current));
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;
- }
+ {
+ /* timeout / error */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of request for statistics failed!\n");
+ do_disconnect (handle);
+ reconnect_later (handle);
+ return 0;
+ }
+ slen1 = strlen (c->subsystem) + 1;
+ slen2 = strlen (c->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_GET);
+ GNUNET_assert (slen1 + slen2 ==
+ GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
+ c->subsystem,
+ c->name));
+ if (GNUNET_YES != handle->receiving)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of GET done, now reading response\n");
+ handle->receiving = GNUNET_YES;
+ GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
+ GNUNET_TIME_absolute_get_remaining (c->timeout));
+ }
+ return msize;
+}
+
+
+/**
+ * Transmit a WATCH request (and if successful, start to receive
+ * the response).
+ *
+ * @param handle statistics handle
+ * @param size how many bytes can we write to buf
+ * @param buf where to write requests to the service
+ * @return number of bytes written to buf
+ */
+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 */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmission of request for statistics failed!\n");
+ do_disconnect (handle);
+ reconnect_later (handle);
+ return 0;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting watch request for `%s'\n",
+ handle->current->name);
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_GET);
+ hdr->type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_WATCH);
GNUNET_assert (slen1 + slen2 ==
- GNUNET_STRINGS_buffer_fill ((char *) &hdr[1],
- slen1 + slen2,
- 2,
+ GNUNET_STRINGS_buffer_fill ((char *) &hdr[1], slen1 + slen2, 2,
handle->current->subsystem,
handle->current->name));
- GNUNET_CLIENT_receive (handle->client,
- &receive_stats,
- handle,
- GNUNET_TIME_absolute_get_remaining (handle->
- current->timeout));
+ if (GNUNET_YES != handle->receiving)
+ {
+ handle->receiving = GNUNET_YES;
+ GNUNET_CLIENT_receive (handle->client, &receive_stats, handle,
+ GNUNET_TIME_UNIT_FOREVER_REL);
+ }
+ GNUNET_assert (NULL == handle->current->cont);
+ free_action_item (handle->current);
+ handle->current = NULL;
return msize;
}
-
/**
* Transmit a SET/UPDATE request.
+ *
+ * @param handle statistics handle
+ * @param size how many bytes can we write to buf
+ * @param buf where to write requests to the service
+ * @return number of bytes written to buf
*/
static size_t
transmit_set (struct GNUNET_STATISTICS_Handle *handle, size_t size, void *buf)
size_t nsize;
if (NULL == buf)
- {
- finish (handle, GNUNET_SYSERR);
- return 0;
- }
-
+ {
+ do_disconnect (handle);
+ reconnect_later (handle);
+ return 0;
+ }
slen = strlen (handle->current->subsystem) + 1;
nlen = strlen (handle->current->name) + 1;
nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
if (size < nsize)
- {
- GNUNET_break (0);
- finish (handle, GNUNET_SYSERR);
- return 0;
- }
+ {
+ GNUNET_break (0);
+ do_disconnect (handle);
+ reconnect_later (handle);
+ return 0;
+ }
r = buf;
r->header.size = htons (nsize);
r->header.type = htons (GNUNET_MESSAGE_TYPE_STATISTICS_SET);
if (handle->current->type == ACTION_UPDATE)
r->flags |= htonl (GNUNET_STATISTICS_SETFLAG_RELATIVE);
GNUNET_assert (slen + nlen ==
- GNUNET_STRINGS_buffer_fill ((char *) &r[1],
- slen + nlen,
- 2,
+ GNUNET_STRINGS_buffer_fill ((char *) &r[1], slen + nlen, 2,
handle->current->subsystem,
handle->current->name));
- finish (handle, GNUNET_OK);
+ GNUNET_assert (NULL == handle->current->cont);
+ free_action_item (handle->current);
+ handle->current = NULL;
return nsize;
}
+/**
+ * Function called when we are ready to transmit a request to the service.
+ *
+ * @param cls the 'struct GNUNET_STATISTICS_Handle'
+ * @param size how many bytes can we write to buf
+ * @param buf where to write requests to the service
+ * @return number of bytes written to buf
+ */
static size_t
transmit_action (void *cls, size_t size, void *buf)
{
- struct GNUNET_STATISTICS_Handle *handle = cls;
+ struct GNUNET_STATISTICS_Handle *h = cls;
size_t ret;
- handle->th = NULL;
- switch (handle->current->type)
+ h->th = NULL;
+ ret = 0;
+ if (NULL != h->current)
+ switch (h->current->type)
{
case ACTION_GET:
- ret = transmit_get (handle, size, buf);
+ ret = transmit_get (h, size, buf);
break;
case ACTION_SET:
case ACTION_UPDATE:
- ret = transmit_set (handle, size, buf);
+ ret = transmit_set (h, size, buf);
+ break;
+ case ACTION_WATCH:
+ ret = transmit_watch (h, size, buf);
break;
default:
- ret = 0;
- GNUNET_break (0);
- break;
+ GNUNET_assert (0);
+ break;
}
+ schedule_action (h);
return ret;
}
/**
- * Schedule the next action to be performed.
+ * Get handle for the statistics service.
+ *
+ * @param subsystem name of subsystem using the service
+ * @param cfg services configuration in use
+ * @return handle to use
*/
-static void
-schedule_action (struct GNUNET_STATISTICS_Handle *h)
+struct GNUNET_STATISTICS_Handle *
+GNUNET_STATISTICS_create (const char *subsystem,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
{
+ struct GNUNET_STATISTICS_Handle *ret;
+
+ GNUNET_assert (subsystem != NULL);
+ GNUNET_assert (cfg != NULL);
+ ret = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_Handle));
+ ret->cfg = cfg;
+ ret->subsystem = GNUNET_strdup (subsystem);
+ ret->backoff = GNUNET_TIME_UNIT_MILLISECONDS;
+ return ret;
+}
+
+
+/**
+ * Destroy a handle (free all state associated with
+ * it).
+ *
+ * @param h statistics handle to destroy
+ * @param sync_first set to GNUNET_YES if pending SET requests should
+ * be completed
+ */
+void
+GNUNET_STATISTICS_destroy (struct GNUNET_STATISTICS_Handle *h, int sync_first)
+{
+ struct GNUNET_STATISTICS_GetHandle *pos;
+ struct GNUNET_STATISTICS_GetHandle *next;
struct GNUNET_TIME_Relative timeout;
+ int i;
- if (h->current != NULL)
- return; /* action already pending */
- if (GNUNET_YES != try_connect (h))
+ if (h == NULL)
+ return;
+ GNUNET_assert (GNUNET_NO == h->do_destroy); // Don't call twice.
+ if (GNUNET_SCHEDULER_NO_TASK != h->backoff_task)
+ {
+ GNUNET_SCHEDULER_cancel (h->backoff_task);
+ h->backoff_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (sync_first)
+ {
+ if (h->current != NULL)
{
- finish (h, GNUNET_SYSERR);
- return;
+ if (h->current->type == ACTION_GET)
+ {
+ GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
+ h->th = NULL;
+ free_action_item (h->current);
+ h->current = NULL;
+ }
}
-
- /* schedule next action */
- h->current = h->action_head;
- if (NULL == h->current)
- return;
- h->action_head = h->action_head->next;
- if (NULL == h->action_head)
- h->action_tail = NULL;
- h->current->next = NULL;
- timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
- if (NULL ==
- (h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
- h->current->msize,
- timeout,
- GNUNET_YES,
- &transmit_action, h)))
+ next = h->action_head;
+ while (NULL != (pos = next))
{
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to transmit request to statistics service.\n");
-#endif
- finish (h, GNUNET_SYSERR);
+ next = pos->next;
+ if (pos->type == ACTION_GET)
+ {
+ GNUNET_CONTAINER_DLL_remove (h->action_head,
+ h->action_tail,
+ pos);
+ free_action_item (pos);
+ }
+ }
+ if ( (NULL == h->current) &&
+ (NULL != (h->current = h->action_head)) )
+ GNUNET_CONTAINER_DLL_remove (h->action_head,
+ h->action_tail,
+ h->current);
+ h->do_destroy = GNUNET_YES;
+ if ((h->current != NULL) && (h->th == NULL))
+ {
+ if (NULL == h->client)
+ {
+ /* instant-connect (regardless of back-off) to submit final value */
+ h->client = GNUNET_CLIENT_connect ("statistics", h->cfg);
+ }
+ if (NULL != h->client)
+ {
+ timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
+ h->th =
+ GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
+ timeout, GNUNET_YES,
+ &transmit_action, h);
+ GNUNET_assert (NULL != h->th);
+ }
}
+ if (h->th != NULL)
+ return; /* do not finish destruction just yet */
+ }
+ while (NULL != (pos = h->action_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (h->action_head,
+ h->action_tail,
+ pos);
+ free_action_item (pos);
+ }
+ do_disconnect (h);
+ for (i = 0; i < h->watches_size; i++)
+ {
+ if (NULL == h->watches[i])
+ continue;
+ 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);
}
+/**
+ * Schedule the next action to be performed.
+ *
+ * @param h statistics handle
+ */
static void
-insert_ai (struct GNUNET_STATISTICS_Handle *h, struct ActionItem *ai)
+schedule_action (struct GNUNET_STATISTICS_Handle *h)
{
- if (h->action_tail == NULL)
- {
- h->action_head = ai;
- h->action_tail = ai;
- schedule_action (h);
- }
- else
+ struct GNUNET_TIME_Relative timeout;
+
+ if ( (h->th != NULL) ||
+ (h->backoff_task != GNUNET_SCHEDULER_NO_TASK) )
+ return; /* action already pending */
+ if (GNUNET_YES != try_connect (h))
+ {
+ reconnect_later (h);
+ return;
+ }
+ if (NULL != h->current)
+ return; /* action already pending */
+ /* schedule next action */
+ h->current = h->action_head;
+ if (NULL == h->current)
+ {
+ if (h->do_destroy)
{
- h->action_tail->next = ai;
- h->action_tail = ai;
+ h->do_destroy = GNUNET_NO;
+ GNUNET_STATISTICS_destroy (h, GNUNET_YES);
}
+ return;
+ }
+ GNUNET_CONTAINER_DLL_remove (h->action_head, h->action_tail, h->current);
+ timeout = GNUNET_TIME_absolute_get_remaining (h->current->timeout);
+ if (NULL ==
+ (h->th =
+ GNUNET_CLIENT_notify_transmit_ready (h->client, h->current->msize,
+ timeout, GNUNET_YES,
+ &transmit_action, h)))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Failed to transmit request to statistics service.\n");
+ do_disconnect (h);
+ reconnect_later (h);
+ }
}
* @param cont continuation to call when done (can be NULL)
* @param proc function to call on each value
* @param cls closure for cont and proc
+ * @return NULL on error
*/
-void
+struct GNUNET_STATISTICS_GetHandle *
GNUNET_STATISTICS_get (struct GNUNET_STATISTICS_Handle *handle,
- const char *subsystem,
- const char *name,
+ const char *subsystem, const char *name,
struct GNUNET_TIME_Relative timeout,
GNUNET_STATISTICS_Callback cont,
GNUNET_STATISTICS_Iterator proc, void *cls)
{
size_t slen1;
size_t slen2;
- struct ActionItem *ai;
+ struct GNUNET_STATISTICS_GetHandle *ai;
- GNUNET_assert (handle != NULL);
+ if (NULL == handle)
+ return NULL;
GNUNET_assert (proc != NULL);
- if (GNUNET_YES != try_connect (handle))
- {
-#if DEBUG_STATISTICS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Failed to connect to statistics service, can not get value `%s:%s'.\n",
- strlen (subsystem) ? subsystem : "*",
- strlen (name) ? name : "*");
-#endif
- if (cont != NULL)
- cont (cls, GNUNET_SYSERR);
- return;
- }
+ GNUNET_assert (GNUNET_NO == handle->do_destroy);
if (subsystem == NULL)
subsystem = "";
if (name == NULL)
name = "";
- slen1 = strlen (subsystem);
- slen2 = strlen (name);
+ slen1 = strlen (subsystem) + 1;
+ slen2 = strlen (name) + 1;
GNUNET_assert (slen1 + slen2 + sizeof (struct GNUNET_MessageHeader) <
GNUNET_SERVER_MAX_MESSAGE_SIZE);
- ai = GNUNET_malloc (sizeof (struct ActionItem));
+ ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
+ ai->sh = handle;
ai->subsystem = GNUNET_strdup (subsystem);
ai->name = GNUNET_strdup (name);
ai->cont = cont;
ai->timeout = GNUNET_TIME_relative_to_absolute (timeout);
ai->type = ACTION_GET;
ai->msize = slen1 + slen2 + sizeof (struct GNUNET_MessageHeader);
- insert_ai (handle, ai);
+ GNUNET_CONTAINER_DLL_insert_tail (handle->action_head, handle->action_tail,
+ ai);
+ schedule_action (handle);
+ return ai;
}
+/**
+ * Cancel a 'get' request. Must be called before the 'cont'
+ * function is called.
+ *
+ * @param gh handle of the request to cancel
+ */
+void
+GNUNET_STATISTICS_get_cancel (struct GNUNET_STATISTICS_GetHandle *gh)
+{
+ if (NULL == gh)
+ return;
+ if (gh->sh->current == gh)
+ {
+ gh->aborted = GNUNET_YES;
+ }
+ else
+ {
+ GNUNET_CONTAINER_DLL_remove (gh->sh->action_head, gh->sh->action_tail, gh);
+ GNUNET_free (gh->name);
+ GNUNET_free (gh->subsystem);
+ GNUNET_free (gh);
+ }
+}
+
+
+/**
+ * Watch statistics from the peer (be notified whenever they change).
+ *
+ * @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;
+}
+
+
+/**
+ * Stop watching statistics from the peer.
+ *
+ * @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 (no such watch)
+ */
+int
+GNUNET_STATISTICS_watch_cancel (struct GNUNET_STATISTICS_Handle *handle,
+ const char *subsystem, const char *name,
+ GNUNET_STATISTICS_Iterator proc, void *proc_cls)
+{
+ struct GNUNET_STATISTICS_WatchEntry *w;
+ unsigned int i;
+
+ if (handle == NULL)
+ return GNUNET_SYSERR;
+ for (i=0;i<handle->watches_size;i++)
+ {
+ w = handle->watches[i];
+ if ( (w->proc == proc) &&
+ (w->proc_cls == proc_cls) &&
+ (0 == strcmp (w->name, name)) &&
+ (0 == strcmp (w->subsystem, subsystem)) )
+ {
+ GNUNET_free (w->name);
+ GNUNET_free (w->subsystem);
+ GNUNET_free (w);
+ handle->watches[i] = NULL;
+ return GNUNET_OK;
+ }
+ }
+ return GNUNET_SYSERR;
+}
+
+
+
+/**
+ * Queue a request to change a statistic.
+ *
+ * @param h statistics handle
+ * @param name name of the value
+ * @param make_persistent should the value be kept across restarts?
+ * @param value new value or change
+ * @param type type of the action (ACTION_SET or ACTION_UPDATE)
+ */
static void
-add_setter_action (struct GNUNET_STATISTICS_Handle *h,
- const char *name,
- int make_persistent,
- uint64_t value, enum ActionType type)
+add_setter_action (struct GNUNET_STATISTICS_Handle *h, const char *name,
+ int make_persistent, uint64_t value, enum ActionType type)
{
- struct ActionItem *ai;
+ struct GNUNET_STATISTICS_GetHandle *ai;
size_t slen;
size_t nlen;
size_t nsize;
+ int64_t delta;
GNUNET_assert (h != NULL);
GNUNET_assert (name != NULL);
- if (GNUNET_YES != try_connect (h))
- return;
slen = strlen (h->subsystem) + 1;
nlen = strlen (name) + 1;
nsize = sizeof (struct GNUNET_STATISTICS_SetMessage) + slen + nlen;
if (nsize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ for (ai = h->action_head; ai != NULL; ai = ai->next)
+ {
+ if (! ( (0 == strcmp (ai->subsystem, h->subsystem)) &&
+ (0 == strcmp (ai->name, name)) &&
+ ( (ai->type == ACTION_UPDATE) ||
+ (ai->type == ACTION_SET) ) ) )
+ continue;
+ if (ai->type == ACTION_SET)
{
- GNUNET_break (0);
- return;
+ if (type == ACTION_UPDATE)
+ {
+ delta = (int64_t) value;
+ if (delta > 0)
+ {
+ /* update old set by new delta */
+ ai->value += delta;
+ }
+ else
+ {
+ /* update old set by new delta, but never go negative */
+ if (ai->value < -delta)
+ ai->value = 0;
+ else
+ ai->value += delta;
+ }
+ }
+ else
+ {
+ /* new set overrides old set */
+ ai->value = value;
+ }
}
- ai = GNUNET_malloc (sizeof (struct ActionItem));
+ else
+ {
+ if (type == ACTION_UPDATE)
+ {
+ /* make delta cummulative */
+ delta = (int64_t) value;
+ ai->value += delta;
+ }
+ else
+ {
+ /* drop old 'update', use new 'set' instead */
+ ai->value = value;
+ ai->type = type;
+ }
+ }
+ ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
+ ai->make_persistent = make_persistent;
+ return;
+ }
+ /* no existing entry matches, create a fresh one */
+ ai = GNUNET_malloc (sizeof (struct GNUNET_STATISTICS_GetHandle));
+ ai->sh = h;
ai->subsystem = GNUNET_strdup (h->subsystem);
ai->name = GNUNET_strdup (name);
ai->timeout = GNUNET_TIME_relative_to_absolute (SET_TRANSMIT_TIMEOUT);
ai->msize = nsize;
ai->value = value;
ai->type = type;
- insert_ai (h, ai);
+ GNUNET_CONTAINER_DLL_insert_tail (h->action_head, h->action_tail,
+ ai);
schedule_action (h);
}
*/
void
GNUNET_STATISTICS_set (struct GNUNET_STATISTICS_Handle *handle,
- const char *name,
- uint64_t value, int make_persistent)
+ const char *name, uint64_t value, int make_persistent)
{
+ if (handle == NULL)
+ return;
+ GNUNET_assert (GNUNET_NO == handle->do_destroy);
add_setter_action (handle, name, make_persistent, value, ACTION_SET);
}
*/
void
GNUNET_STATISTICS_update (struct GNUNET_STATISTICS_Handle *handle,
- const char *name,
- int64_t delta, int make_persistent)
+ const char *name, int64_t delta, int make_persistent)
{
- add_setter_action (handle, name, make_persistent,
- (unsigned long long) delta, ACTION_UPDATE);
+ if (handle == NULL)
+ return;
+ if (delta == 0)
+ return;
+ GNUNET_assert (GNUNET_NO == handle->do_destroy);
+ add_setter_action (handle, name, make_persistent, (uint64_t) delta,
+ ACTION_UPDATE);
}
projects / oweals / gnunet.git / blobdiff