/**
* Transmit a message to a particular peer.
*
* @param car original request that was queued and then solicited;
* this handle will now be 'owned' by the SESSIONS subsystem
* @param msg message to transmit
* @param cork is corking allowed?
* @param priority how important is this message
*/
void
GSC_SESSIONS_transmit (struct GSC_ClientActiveRequest *car,
const struct GNUNET_MessageHeader *msg,
int cork,
enum GNUNET_CORE_Priority priority)
{
struct Session *session;
struct SessionMessageEntry *sme;
struct SessionMessageEntry *pos;
size_t msize;
session = find_session (&car->target);
if (NULL == session)
return;
msize = ntohs (msg->size);
sme = GNUNET_malloc (sizeof (struct SessionMessageEntry) + msize);
memcpy (&sme[1], msg, msize);
sme->size = msize;
sme->priority = priority;
if (GNUNET_YES == cork)
sme->deadline =
GNUNET_TIME_relative_to_absolute (GNUNET_CONSTANTS_MAX_CORK_DELAY);
pos = session->sme_head;
while ( (NULL != pos) &&
(pos->priority >= sme->priority) )
pos = pos->next;
if (NULL == pos)
GNUNET_CONTAINER_DLL_insert_tail (session->sme_head,
session->sme_tail,
sme);
else
GNUNET_CONTAINER_DLL_insert_after (session->sme_head,
session->sme_tail,
pos->prev,
sme);
try_transmission (session);
}
/**
* Create a new entry for our priority queue (and possibly discard other entires if
* the queue is getting too long).
*
* @param h handle to the datastore
* @param msize size of the message to queue
* @param queue_priority priority of the entry
* @param max_queue_size at what queue size should this request be dropped
* (if other requests of higher priority are in the queue)
* @param timeout timeout for the operation
* @param response_proc function to call with replies (can be NULL)
* @param qc client context (NOT a closure for response_proc)
* @return NULL if the queue is full
*/
static struct GNUNET_DATASTORE_QueueEntry *
make_queue_entry (struct GNUNET_DATASTORE_Handle *h, size_t msize,
unsigned int queue_priority, unsigned int max_queue_size,
struct GNUNET_TIME_Relative timeout,
GNUNET_CLIENT_MessageHandler response_proc,
const union QueueContext *qc)
{
struct GNUNET_DATASTORE_QueueEntry *ret;
struct GNUNET_DATASTORE_QueueEntry *pos;
unsigned int c;
c = 0;
pos = h->queue_head;
while ((pos != NULL) && (c < max_queue_size) &&
(pos->priority >= queue_priority))
{
c++;
pos = pos->next;
}
if (c >= max_queue_size)
{
GNUNET_STATISTICS_update (h->stats, gettext_noop ("# queue overflows"), 1,
GNUNET_NO);
return NULL;
}
ret = GNUNET_malloc (sizeof (struct GNUNET_DATASTORE_QueueEntry) + msize);
ret->h = h;
ret->response_proc = response_proc;
ret->qc = *qc;
ret->timeout = GNUNET_TIME_relative_to_absolute (timeout);
ret->priority = queue_priority;
ret->max_queue = max_queue_size;
ret->message_size = msize;
ret->was_transmitted = GNUNET_NO;
if (pos == NULL)
{
/* append at the tail */
pos = h->queue_tail;
}
else
{
pos = pos->prev;
/* do not insert at HEAD if HEAD query was already
* transmitted and we are still receiving replies! */
if ((pos == NULL) && (h->queue_head->was_transmitted))
pos = h->queue_head;
}
c++;
#if INSANE_STATISTICS
GNUNET_STATISTICS_update (h->stats, gettext_noop ("# queue entries created"),
1, GNUNET_NO);
#endif
GNUNET_CONTAINER_DLL_insert_after (h->queue_head, h->queue_tail, pos, ret);
h->queue_size++;
ret->task = GNUNET_SCHEDULER_add_delayed (timeout, &timeout_queue_entry, ret);
for (pos = ret->next; NULL != pos; pos = pos->next)
{
if ((pos->max_queue < h->queue_size) && (pos->was_transmitted == GNUNET_NO))
{
GNUNET_assert (pos->response_proc != NULL);
/* move 'pos' element to head so that it will be
* killed on 'NULL' call below */
LOG (GNUNET_ERROR_TYPE_DEBUG, "Dropping request from datastore queue\n");
GNUNET_CONTAINER_DLL_remove (h->queue_head, h->queue_tail, pos);
GNUNET_CONTAINER_DLL_insert (h->queue_head, h->queue_tail, pos);
GNUNET_STATISTICS_update (h->stats,
gettext_noop
("# Requests dropped from datastore queue"), 1,
GNUNET_NO);
GNUNET_assert (h->queue_head == pos);
pos->response_proc (h, NULL);
break;
}
}
return ret;
}