GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
#include "gnunet_datastore_service.h"
#include "datastore.h"
+
+/**
+ * Context for processing status messages.
+ */
+struct StatusContext
+{
+ /**
+ * Continuation to call with the status.
+ */
+ GNUNET_DATASTORE_ContinuationWithStatus cont;
+
+ /**
+ * Closure for cont.
+ */
+ void *cont_cls;
+
+};
+
+
+/**
+ * Context for processing result messages.
+ */
+struct ResultContext
+{
+ /**
+ * Iterator to call with the result.
+ */
+ GNUNET_DATASTORE_Iterator iter;
+
+ /**
+ * Closure for iter.
+ */
+ void *iter_cls;
+
+};
+
+
+/**
+ * Context for a queue operation.
+ */
+union QueueContext
+{
+
+ struct StatusContext sc;
+
+ struct ResultContext rc;
+
+};
+
+
+
/**
* Entry in our priority queue.
*/
-struct QueueEntry
+struct GNUNET_DATASTORE_QueueEntry
{
/**
* This is a linked list.
*/
- struct QueueEntry *next;
+ struct GNUNET_DATASTORE_QueueEntry *next;
/**
* This is a linked list.
*/
- struct QueueEntry *prev;
+ struct GNUNET_DATASTORE_QueueEntry *prev;
/**
* Handle to the master context.
/**
* Response processor (NULL if we are not waiting for a response).
* This struct should be used for the closure, function-specific
- * arguments can be passed via 'client_ctx'.
+ * arguments can be passed via 'qc'.
*/
GNUNET_CLIENT_MessageHandler response_proc;
-
- /**
- * Specific context (variable argument that
- * can be used by the response processor).
- */
- void *client_ctx;
/**
* Function to call after transmission of the request.
*/
- GNUNET_DATASTORE_ContinuationWithStatus contX;
+ GNUNET_DATASTORE_ContinuationWithStatus cont;
/**
* Closure for 'cont'.
*/
- void *cont_clsX;
+ void *cont_cls;
+
+ /**
+ * Context for the operation.
+ */
+ union QueueContext qc;
/**
* Task for timeout signalling.
/**
* Current head of priority queue.
*/
- struct QueueEntry *queue_head;
+ struct GNUNET_DATASTORE_QueueEntry *queue_head;
/**
* Current tail of priority queue.
*/
- struct QueueEntry *queue_tail;
+ struct GNUNET_DATASTORE_QueueEntry *queue_tail;
/**
* Task for trying to reconnect.
*/
unsigned int queue_size;
+ /**
+ * Are we currently trying to receive from the service?
+ */
+ int in_receive;
+
};
if (c == NULL)
return NULL; /* oops */
h = GNUNET_malloc (sizeof(struct GNUNET_DATASTORE_Handle) +
- GNUNET_SERVER_MAX_MESSAGE_SIZE);
+ GNUNET_SERVER_MAX_MESSAGE_SIZE - 1);
h->client = c;
h->cfg = cfg;
h->sched = sched;
void GNUNET_DATASTORE_disconnect (struct GNUNET_DATASTORE_Handle *h,
int drop)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
if (h->client != NULL)
- GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
+ {
+ GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
+ h->client = NULL;
+ }
if (h->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
- GNUNET_SCHEDULER_cancel (h->sched,
- h->reconnect_task);
- h->client = NULL;
+ {
+ GNUNET_SCHEDULER_cancel (h->sched,
+ h->reconnect_task);
+ h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
+ }
while (NULL != (qe = h->queue_head))
{
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- if (NULL != qe->response_proc)
- qe->response_proc (qe, NULL);
- GNUNET_free (qe);
+ GNUNET_assert (NULL != qe->response_proc);
+ qe->response_proc (qe, NULL);
}
if (GNUNET_YES == drop)
{
/**
* A request has timed out (before being transmitted to the service).
*
- * @param cls the 'struct QueueEntry'
+ * @param cls the 'struct GNUNET_DATASTORE_QueueEntry'
* @param tc scheduler context
*/
static void
timeout_queue_entry (void *cls,
const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- struct QueueEntry *qe = cls;
- struct GNUNET_DATASTORE_Handle *h = qe->h;
+ struct GNUNET_DATASTORE_QueueEntry *qe = cls;
qe->task = GNUNET_SCHEDULER_NO_TASK;
GNUNET_assert (qe->was_transmitted == GNUNET_NO);
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- if (qe->response_proc != NULL)
- qe->response_proc (qe, NULL);
- GNUNET_free (qe);
+ qe->response_proc (qe, NULL);
}
* (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 client_ctx client context (NOT a closure for response_proc)
+ * @param qc client context (NOT a closure for response_proc)
* @return NULL if the queue is full (and this entry was dropped)
*/
-static struct QueueEntry *
+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,
- void *client_ctx)
+ const union QueueContext *qc)
{
- struct QueueEntry *ret;
- struct QueueEntry *pos;
+ struct GNUNET_DATASTORE_QueueEntry *ret;
+ struct GNUNET_DATASTORE_QueueEntry *pos;
unsigned int c;
c = 0;
c++;
pos = pos->next;
}
- if (c >= max_queue_size)
- 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 */
(h->queue_head->was_transmitted) )
pos = h->queue_head;
}
- ret = GNUNET_malloc (sizeof (struct QueueEntry) + msize);
+ c++;
GNUNET_CONTAINER_DLL_insert_after (h->queue_head,
h->queue_tail,
pos,
ret);
- ret->h = h;
- ret->response_proc = response_proc;
- ret->client_ctx = client_ctx;
+ h->queue_size++;
+ if (c > max_queue_size)
+ {
+ response_proc (ret, NULL);
+ return NULL;
+ }
ret->task = GNUNET_SCHEDULER_add_delayed (h->sched,
timeout,
&timeout_queue_entry,
ret);
- 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;
- h->queue_size++;
- c++;
pos = ret->next;
while (pos != NULL)
{
if (pos->max_queue < h->queue_size)
{
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- pos);
- GNUNET_SCHEDULER_cancel (h->sched,
- pos->task);
- if (pos->response_proc != NULL)
- pos->response_proc (pos, NULL);
- GNUNET_free (pos);
- h->queue_size--;
+ GNUNET_assert (pos->response_proc != NULL);
+ pos->response_proc (pos, NULL);
break;
}
pos = pos->next;
h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
h->client = GNUNET_CLIENT_connect (h->sched, "datastore", h->cfg);
if (h->client == NULL)
- return;
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "DATASTORE reconnect failed (fatally)\n");
+ return;
+ }
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Reconnected to DATASTORE\n");
+#endif
process_queue (h);
}
* Disconnect from the service and then try reconnecting to the datastore service
* after some delay.
*
- * @param cls the 'struct GNUNET_DATASTORE_Handle'
- * @param tc scheduler context
+ * @param h handle to datastore to disconnect and reconnect
*/
static void
do_disconnect (struct GNUNET_DATASTORE_Handle *h)
{
+ if (h->client == NULL)
+ {
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "client NULL in disconnect, will not try to reconnect\n");
+#endif
+ return;
+ }
+#if 0
+ GNUNET_STATISTICS_update (stats,
+ gettext_noop ("# reconnected to DATASTORE"),
+ 1,
+ GNUNET_NO);
+#endif
GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
h->client = NULL;
h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->sched,
void *buf)
{
struct GNUNET_DATASTORE_Handle *h = cls;
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
size_t msize;
h->th = NULL;
if (buf == NULL)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to transmit request to database.\n"));
+ _("Failed to transmit request to DATASTORE.\n"));
do_disconnect (h);
return 0;
}
process_queue (h);
return 0;
}
+ #if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Transmitting %u byte request to DATASTORE\n",
+ msize);
+#endif
memcpy (buf, &qe[1], msize);
qe->was_transmitted = GNUNET_YES;
GNUNET_SCHEDULER_cancel (h->sched,
qe->task);
qe->task = GNUNET_SCHEDULER_NO_TASK;
+ h->in_receive = GNUNET_YES;
GNUNET_CLIENT_receive (h->client,
qe->response_proc,
qe,
static void
process_queue (struct GNUNET_DATASTORE_Handle *h)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
if (NULL == (qe = h->queue_head))
- return; /* no entry in queue */
+ {
+#if DEBUG_DATASTORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queue empty\n");
+#endif
+ return; /* no entry in queue */
+ }
if (qe->was_transmitted == GNUNET_YES)
- return; /* waiting for replies */
+ {
+#if DEBUG_DATASTORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Head request already transmitted\n");
+#endif
+ return; /* waiting for replies */
+ }
if (h->th != NULL)
- return; /* request pending */
+ {
+#if DEBUG_DATASTORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Pending transmission request\n");
+#endif
+ return; /* request pending */
+ }
if (h->client == NULL)
- return; /* waiting for reconnect */
+ {
+#if DEBUG_DATASTORE > 1
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Not connected\n");
+#endif
+ return; /* waiting for reconnect */
+ }
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Queueing %u byte request to DATASTORE\n",
+ qe->message_size);
+#endif
h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
qe->message_size,
GNUNET_TIME_absolute_get_remaining (qe->timeout),
}
-
-
-/**
- * Context for processing status messages.
- */
-struct StatusContext
-{
- /**
- * Continuation to call with the status.
- */
- GNUNET_DATASTORE_ContinuationWithStatus cont;
-
- /**
- * Closure for cont.
- */
- void *cont_cls;
-
-};
-
-
/**
* Dummy continuation used to do nothing (but be non-zero).
*
}
+static void
+free_queue_entry (struct GNUNET_DATASTORE_QueueEntry *qe)
+{
+ struct GNUNET_DATASTORE_Handle *h = qe->h;
+
+ GNUNET_CONTAINER_DLL_remove (h->queue_head,
+ h->queue_tail,
+ qe);
+ if (qe->task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (h->sched,
+ qe->task);
+ qe->task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ h->queue_size--;
+ GNUNET_free (qe);
+}
+
/**
* Type of a function to call when we receive a message
* from the service.
const struct
GNUNET_MessageHeader * msg)
{
- struct QueueEntry *qe = cls;
+ struct GNUNET_DATASTORE_QueueEntry *qe = cls;
struct GNUNET_DATASTORE_Handle *h = qe->h;
- struct StatusContext *rc = qe->client_ctx;
+ struct StatusContext rc = qe->qc.sc;
const struct StatusMessage *sm;
const char *emsg;
int32_t status;
+ int was_transmitted;
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- GNUNET_free (qe);
+ h->in_receive = GNUNET_NO;
+ was_transmitted = qe->was_transmitted;
if (msg == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to receive response from database.\n"));
- do_disconnect (h);
+ {
+ free_queue_entry (qe);
+ if (NULL == h->client)
+ return; /* forced disconnect */
+ if (was_transmitted == GNUNET_YES)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to receive response from database.\n"));
+ do_disconnect (h);
+ }
return;
}
-
+ GNUNET_assert (GNUNET_YES == qe->was_transmitted);
+ GNUNET_assert (h->queue_head == qe);
+ free_queue_entry (qe);
if ( (ntohs(msg->size) < sizeof(struct StatusMessage)) ||
(ntohs(msg->type) != GNUNET_MESSAGE_TYPE_DATASTORE_STATUS) )
{
GNUNET_break (0);
h->retry_time = GNUNET_TIME_UNIT_ZERO;
do_disconnect (h);
- rc->cont (rc->cont_cls,
- GNUNET_SYSERR,
- _("Error reading response from datastore service"));
- GNUNET_free (rc);
+ rc.cont (rc.cont_cls,
+ GNUNET_SYSERR,
+ _("Error reading response from datastore service"));
return;
}
sm = (const struct StatusMessage*) msg;
(int) status,
emsg);
#endif
- rc->cont (rc->cont_cls,
- status,
- emsg);
- GNUNET_free (rc);
+ rc.cont (rc.cont_cls,
+ status,
+ emsg);
process_queue (h);
}
* @param timeout timeout for the operation
* @param cont continuation to call when done
* @param cont_cls closure for cont
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_put (struct GNUNET_DATASTORE_Handle *h,
int rid,
const GNUNET_HashCode * key,
GNUNET_DATASTORE_ContinuationWithStatus cont,
void *cont_cls)
{
- struct StatusContext *scont;
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct DataMessage *dm;
size_t msize;
+ union QueueContext qc;
#if DEBUG_DATASTORE
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
GNUNET_h2s (key));
#endif
msize = sizeof(struct DataMessage) + size;
- GNUNET_assert (msize <= GNUNET_SERVER_MAX_MESSAGE_SIZE);
- scont = GNUNET_malloc (sizeof (struct StatusContext));
- scont->cont = cont;
- scont->cont_cls = cont_cls;
+ GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
+ qc.sc.cont = cont;
+ qc.sc.cont_cls = cont_cls;
qe = make_queue_entry (h, msize,
queue_priority, max_queue_size, timeout,
- &process_status_message, scont);
+ &process_status_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
dm = (struct DataMessage* ) &qe[1];
dm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_PUT);
dm->header.size = htons(msize);
dm->key = *key;
memcpy (&dm[1], data, size);
process_queue (h);
+ return qe;
}
* @param cont continuation to call when done; "success" will be set to
* a positive reservation value if space could be reserved.
* @param cont_cls closure for cont
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_reserve (struct GNUNET_DATASTORE_Handle *h,
uint64_t amount,
uint32_t entries,
GNUNET_DATASTORE_ContinuationWithStatus cont,
void *cont_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct ReserveMessage *rm;
- struct StatusContext *scont;
+ union QueueContext qc;
if (cont == NULL)
cont = &drop_status_cont;
(unsigned long long) amount,
(unsigned int) entries);
#endif
- scont = GNUNET_malloc (sizeof (struct StatusContext));
- scont->cont = cont;
- scont->cont_cls = cont_cls;
+ qc.sc.cont = cont;
+ qc.sc.cont_cls = cont_cls;
qe = make_queue_entry (h, sizeof(struct ReserveMessage),
queue_priority, max_queue_size, timeout,
- &process_status_message, scont);
+ &process_status_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
rm = (struct ReserveMessage*) &qe[1];
rm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_RESERVE);
rm->header.size = htons(sizeof (struct ReserveMessage));
rm->entries = htonl(entries);
rm->amount = GNUNET_htonll(amount);
process_queue (h);
+ return qe;
}
* @param timeout how long to wait at most for a response
* @param cont continuation to call when done
* @param cont_cls closure for cont
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_release_reserve (struct GNUNET_DATASTORE_Handle *h,
int rid,
unsigned int queue_priority,
GNUNET_DATASTORE_ContinuationWithStatus cont,
void *cont_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct ReleaseReserveMessage *rrm;
- struct StatusContext *scont;
+ union QueueContext qc;
if (cont == NULL)
cont = &drop_status_cont;
"Asked to release reserve %d\n",
rid);
#endif
- scont = GNUNET_malloc (sizeof (struct StatusContext));
- scont->cont = cont;
- scont->cont_cls = cont_cls;
+ qc.sc.cont = cont;
+ qc.sc.cont_cls = cont_cls;
qe = make_queue_entry (h, sizeof(struct ReleaseReserveMessage),
queue_priority, max_queue_size, timeout,
- &process_status_message, scont);
+ &process_status_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
rrm = (struct ReleaseReserveMessage*) &qe[1];
rrm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_RELEASE_RESERVE);
rrm->header.size = htons(sizeof (struct ReleaseReserveMessage));
rrm->rid = htonl(rid);
process_queue (h);
+ return qe;
}
* @param timeout how long to wait at most for a response
* @param cont continuation to call when done
* @param cont_cls closure for cont
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_update (struct GNUNET_DATASTORE_Handle *h,
unsigned long long uid,
uint32_t priority,
GNUNET_DATASTORE_ContinuationWithStatus cont,
void *cont_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct UpdateMessage *um;
- struct StatusContext *scont;
+ union QueueContext qc;
if (cont == NULL)
cont = &drop_status_cont;
(unsigned int) priority,
(unsigned long long) expiration.value);
#endif
- scont = GNUNET_malloc (sizeof (struct StatusContext));
- scont->cont = cont;
- scont->cont_cls = cont_cls;
+ qc.sc.cont = cont;
+ qc.sc.cont_cls = cont_cls;
qe = make_queue_entry (h, sizeof(struct UpdateMessage),
queue_priority, max_queue_size, timeout,
- &process_status_message, scont);
+ &process_status_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
um = (struct UpdateMessage*) &qe[1];
um->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_UPDATE);
um->header.size = htons(sizeof (struct UpdateMessage));
um->expiration = GNUNET_TIME_absolute_hton(expiration);
um->uid = GNUNET_htonll(uid);
process_queue (h);
+ return qe;
}
* @param timeout how long to wait at most for a response
* @param cont continuation to call when done
* @param cont_cls closure for cont
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_remove (struct GNUNET_DATASTORE_Handle *h,
const GNUNET_HashCode *key,
uint32_t size,
GNUNET_DATASTORE_ContinuationWithStatus cont,
void *cont_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct DataMessage *dm;
size_t msize;
- struct StatusContext *scont;
+ union QueueContext qc;
if (cont == NULL)
cont = &drop_status_cont;
size,
GNUNET_h2s (key));
#endif
- scont = GNUNET_malloc (sizeof (struct StatusContext));
- scont->cont = cont;
- scont->cont_cls = cont_cls;
+ qc.sc.cont = cont;
+ qc.sc.cont_cls = cont_cls;
msize = sizeof(struct DataMessage) + size;
- GNUNET_assert (msize <= GNUNET_SERVER_MAX_MESSAGE_SIZE);
+ GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
qe = make_queue_entry (h, msize,
queue_priority, max_queue_size, timeout,
- &process_status_message, scont);
+ &process_status_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
dm = (struct DataMessage*) &qe[1];
dm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_REMOVE);
dm->header.size = htons(msize);
dm->key = *key;
memcpy (&dm[1], data, size);
process_queue (h);
+ return qe;
}
-
-/**
- * Context for processing result messages.
- */
-struct ResultContext
-{
- /**
- * Iterator to call with the result.
- */
- GNUNET_DATASTORE_Iterator iter;
-
- /**
- * Closure for iter.
- */
- void *iter_cls;
-
-};
-
-
/**
* Type of a function to call when we receive a message
* from the service.
process_result_message (void *cls,
const struct GNUNET_MessageHeader * msg)
{
- struct QueueEntry *qe = cls;
+ struct GNUNET_DATASTORE_QueueEntry *qe = cls;
struct GNUNET_DATASTORE_Handle *h = qe->h;
- struct ResultContext *rc = qe->client_ctx;
+ struct ResultContext rc = qe->qc.rc;
const struct DataMessage *dm;
+ int was_transmitted;
+ h->in_receive = GNUNET_NO;
if (msg == NULL)
{
-#if DEBUG_DATASTORE
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to receive response from datastore\n"));
-#endif
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- GNUNET_free (qe);
- do_disconnect (h);
- rc->iter (rc->iter_cls,
- NULL, 0, NULL, 0, 0, 0,
- GNUNET_TIME_UNIT_ZERO_ABS, 0);
- GNUNET_free (rc);
+ was_transmitted = qe->was_transmitted;
+ free_queue_entry (qe);
+ if (was_transmitted == GNUNET_YES)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to receive response from database.\n"));
+ do_disconnect (h);
+ }
+ if (rc.iter != NULL)
+ rc.iter (rc.iter_cls,
+ NULL, 0, NULL, 0, 0, 0,
+ GNUNET_TIME_UNIT_ZERO_ABS, 0);
return;
}
+ GNUNET_assert (GNUNET_YES == qe->was_transmitted);
+ GNUNET_assert (h->queue_head == qe);
if (ntohs(msg->type) == GNUNET_MESSAGE_TYPE_DATASTORE_DATA_END)
{
GNUNET_break (ntohs(msg->size) == sizeof(struct GNUNET_MessageHeader));
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Received end of result set\n");
#endif
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- GNUNET_free (qe);
- rc->iter (rc->iter_cls,
- NULL, 0, NULL, 0, 0, 0,
- GNUNET_TIME_UNIT_ZERO_ABS, 0);
- GNUNET_free (rc);
+ free_queue_entry (qe);
+ if (rc.iter != NULL)
+ rc.iter (rc.iter_cls,
+ NULL, 0, NULL, 0, 0, 0,
+ GNUNET_TIME_UNIT_ZERO_ABS, 0);
process_queue (h);
return;
}
(ntohs(msg->size) != sizeof(struct DataMessage) + ntohl (((const struct DataMessage*)msg)->size)) )
{
GNUNET_break (0);
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- GNUNET_free (qe);
+ free_queue_entry (qe);
+ h->retry_time = GNUNET_TIME_UNIT_ZERO;
+ do_disconnect (h);
+ if (rc.iter != NULL)
+ rc.iter (rc.iter_cls,
+ NULL, 0, NULL, 0, 0, 0,
+ GNUNET_TIME_UNIT_ZERO_ABS, 0);
+ return;
+ }
+ if (rc.iter == NULL)
+ {
+ /* abort iteration */
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Aborting iteration via disconnect (client has cancelled)\n");
+#endif
+ free_queue_entry (qe);
h->retry_time = GNUNET_TIME_UNIT_ZERO;
do_disconnect (h);
- rc->iter (rc->iter_cls,
- NULL, 0, NULL, 0, 0, 0,
- GNUNET_TIME_UNIT_ZERO_ABS, 0);
- GNUNET_free (rc);
return;
}
dm = (const struct DataMessage*) msg;
ntohl(dm->size),
GNUNET_h2s(&dm->key));
#endif
- rc->iter (rc->iter_cls,
- &dm->key,
- ntohl(dm->size),
- &dm[1],
- ntohl(dm->type),
- ntohl(dm->priority),
- ntohl(dm->anonymity),
- GNUNET_TIME_absolute_ntoh(dm->expiration),
- GNUNET_ntohll(dm->uid));
+ rc.iter (rc.iter_cls,
+ &dm->key,
+ ntohl(dm->size),
+ &dm[1],
+ ntohl(dm->type),
+ ntohl(dm->priority),
+ ntohl(dm->anonymity),
+ GNUNET_TIME_absolute_ntoh(dm->expiration),
+ GNUNET_ntohll(dm->uid));
}
* will be called once with a value (if available)
* and always once with a value of NULL.
* @param iter_cls closure for iter
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_get_random (struct GNUNET_DATASTORE_Handle *h,
unsigned int queue_priority,
unsigned int max_queue_size,
GNUNET_DATASTORE_Iterator iter,
void *iter_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct GNUNET_MessageHeader *m;
- struct ResultContext *rcont;
+ union QueueContext qc;
#if DEBUG_DATASTORE
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Asked to get random entry in %llu ms\n",
(unsigned long long) timeout.value);
#endif
- rcont = GNUNET_malloc (sizeof (struct ResultContext));
- rcont->iter = iter;
- rcont->iter_cls = iter_cls;
+ qc.rc.iter = iter;
+ qc.rc.iter_cls = iter_cls;
qe = make_queue_entry (h, sizeof(struct GNUNET_MessageHeader),
queue_priority, max_queue_size, timeout,
- &process_result_message, rcont);
+ &process_result_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
m = (struct GNUNET_MessageHeader*) &qe[1];
m->type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_GET_RANDOM);
m->size = htons(sizeof (struct GNUNET_MessageHeader));
process_queue (h);
+ return qe;
}
* @param iter function to call on each matching value;
* will be called once with a NULL value at the end
* @param iter_cls closure for iter
+ * @return NULL if the entry was not queued, otherwise a handle that can be used to
+ * cancel; note that even if NULL is returned, the callback will be invoked
+ * (or rather, will already have been invoked)
*/
-void
+struct GNUNET_DATASTORE_QueueEntry *
GNUNET_DATASTORE_get (struct GNUNET_DATASTORE_Handle *h,
const GNUNET_HashCode * key,
enum GNUNET_BLOCK_Type type,
GNUNET_DATASTORE_Iterator iter,
void *iter_cls)
{
- struct QueueEntry *qe;
+ struct GNUNET_DATASTORE_QueueEntry *qe;
struct GetMessage *gm;
- struct ResultContext *rcont;
+ union QueueContext qc;
#if DEBUG_DATASTORE
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
(unsigned int) type,
GNUNET_h2s (key));
#endif
- rcont = GNUNET_malloc (sizeof (struct ResultContext));
- rcont->iter = iter;
- rcont->iter_cls = iter_cls;
+ qc.rc.iter = iter;
+ qc.rc.iter_cls = iter_cls;
qe = make_queue_entry (h, sizeof(struct GetMessage),
queue_priority, max_queue_size, timeout,
- &process_result_message, rcont);
+ &process_result_message, &qc);
if (qe == NULL)
- return;
+ return NULL;
gm = (struct GetMessage*) &qe[1];
gm->header.type = htons(GNUNET_MESSAGE_TYPE_DATASTORE_GET);
gm->type = htonl(type);
gm->header.size = htons(sizeof (struct GetMessage) - sizeof(GNUNET_HashCode));
}
process_queue (h);
+ return qe;
}
GNUNET_DATASTORE_get_next (struct GNUNET_DATASTORE_Handle *h,
int more)
{
- struct QueueEntry *qe = h->queue_head;
- struct ResultContext *rc = qe->client_ctx;
+ struct GNUNET_DATASTORE_QueueEntry *qe = h->queue_head;
+ struct ResultContext rc = qe->qc.rc;
- GNUNET_assert (NULL != qe);
GNUNET_assert (&process_result_message == qe->response_proc);
if (GNUNET_YES == more)
{
+ h->in_receive = GNUNET_YES;
GNUNET_CLIENT_receive (h->client,
qe->response_proc,
qe,
GNUNET_TIME_absolute_get_remaining (qe->timeout));
return;
}
- GNUNET_CONTAINER_DLL_remove (h->queue_head,
- h->queue_tail,
- qe);
- GNUNET_free (qe);
+ free_queue_entry (qe);
h->retry_time = GNUNET_TIME_UNIT_ZERO;
do_disconnect (h);
- rc->iter (rc->iter_cls,
- NULL, 0, NULL, 0, 0, 0,
- GNUNET_TIME_UNIT_ZERO_ABS, 0);
- GNUNET_free (rc);
+ rc.iter (rc.iter_cls,
+ NULL, 0, NULL, 0, 0, 0,
+ GNUNET_TIME_UNIT_ZERO_ABS, 0);
+}
+
+
+/**
+ * Cancel a datastore operation. The final callback from the
+ * operation must not have been done yet.
+ *
+ * @param qe operation to cancel
+ */
+void
+GNUNET_DATASTORE_cancel (struct GNUNET_DATASTORE_QueueEntry *qe)
+{
+ struct GNUNET_DATASTORE_Handle *h;
+ int reconnect;
+
+ h = qe->h;
+#if DEBUG_DATASTORE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Pending DATASTORE request %p cancelled (%d, %d)\n",
+ qe,
+ qe->was_transmitted,
+ h->queue_head == qe);
+#endif
+ reconnect = GNUNET_NO;
+ if (GNUNET_YES == qe->was_transmitted)
+ {
+ if (qe->response_proc == &process_result_message)
+ {
+ qe->qc.rc.iter = NULL;
+ if (GNUNET_YES != h->in_receive)
+ GNUNET_DATASTORE_get_next (h, GNUNET_YES);
+ return;
+ }
+ reconnect = GNUNET_YES;
+ }
+ free_queue_entry (qe);
+ if (reconnect)
+ {
+ h->retry_time = GNUNET_TIME_UNIT_ZERO;
+ do_disconnect (h);
+ }
+ else
+ {
+ process_queue (h);
+ }
}
projects / oweals / gnunet.git / blobdiff