/*
This file is part of GNUnet
- Copyright (C) 2012, 2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2012, 2013, 2018 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
- by the Free Software Foundation; either version 3, or (at your
- option) any later version.
+ GNUnet is free software: you can redistribute it and/or modify it
+ under the terms of the GNU Affero General Public License as published
+ by the Free Software Foundation, either version 3 of the License,
+ or (at your option) any later version.
GNUnet is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
+ Affero General Public License for more details.
- 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., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA.
-*/
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ SPDX-License-Identifier: AGPL3.0-or-later
+ */
/**
* @author Christian Grothoff
* authoritative, or blocks which are cached, encrypted naming data from other
* peers.
*
+ * @see [Documentation](https://gnunet.org/namestore-subsystem)
+ *
* @{
*/
#ifndef GNUNET_NAMESTORE_SERVICE_H
* it is replaced with the new record. Use an empty array to
* remove all records under the given name.
*
+ * The continuation is called after the value has been stored in the
+ * database. Monitors may be notified asynchronously (basically with
+ * a buffer). However, if any monitor is consistently too slow to
+ * keep up with the changes, calling @a cont will be delayed until the
+ * monitors do keep up.
+ *
* @param h handle to the namestore
* @param pkey private key of the zone
* @param label name that is being mapped
*/
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_records_store (struct GNUNET_NAMESTORE_Handle *h,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
- const char *label,
- unsigned int rd_count,
- const struct GNUNET_GNSRECORD_Data *rd,
- GNUNET_NAMESTORE_ContinuationWithStatus cont,
- void *cont_cls);
-
+ const struct
+ GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
+ const char *label,
+ unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd,
+ GNUNET_NAMESTORE_ContinuationWithStatus cont,
+ void *cont_cls);
/**
* Process a record that was stored in the namestore.
*
* @param cls closure
- * @param zone private key of the zone; NULL on disconnect
- * @param label label of the records; NULL on disconnect
+ * @param zone private key of the zone
+ * @param label label of the records
* @param rd_count number of entries in @a rd array, 0 if label was deleted
* @param rd array of records with data to store
*/
typedef void
(*GNUNET_NAMESTORE_RecordMonitor) (void *cls,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
+ const struct
+ GNUNET_CRYPTO_EcdsaPrivateKey *zone,
const char *label,
unsigned int rd_count,
const struct GNUNET_GNSRECORD_Data *rd);
* @param pkey private key of the zone
* @param nick the nick name to set
* @param cont continuation to call when done
- * @param cont_cls closure for 'cont'
+ * @param cont_cls closure for @a cont
* @return handle to abort the request
*/
struct GNUNET_NAMESTORE_QueueEntry *
* @param h handle to the namestore
* @param pkey private key of the zone
* @param label name that is being mapped
- * @param rm function to call with the result (with 0 records if we don't have that label)
+ * @param error_cb function to call on error (i.e. disconnect)
+ * the handle is afterwards invalid
+ * @param error_cb_cls closure for @a error_cb
+ * @param rm function to call with the result (with 0 records if we don't have that label);
+ * the handle is afterwards invalid
* @param rm_cls closure for @a rm
* @return handle to abort the request
*/
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_records_lookup (struct GNUNET_NAMESTORE_Handle *h,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
+ const struct
+ GNUNET_CRYPTO_EcdsaPrivateKey *pkey,
const char *label,
+ GNUNET_SCHEDULER_TaskCallback error_cb,
+ void *error_cb_cls,
GNUNET_NAMESTORE_RecordMonitor rm,
void *rm_cls);
* Returns at most one result to the processor.
*
* @param h handle to the namestore
- * @param zone public key of the zone to look up in, never NULL
+ * @param zone private key of the zone to look up in, never NULL
* @param value_zone public key of the target zone (value), never NULL
+ * @param error_cb function to call on error (i.e. disconnect)
+ * the handle is afterwards invalid
+ * @param error_cb_cls closure for @a error_cb
* @param proc function to call on the matching records, or with
- * NULL (rd_count == 0) if there are no matching records
+ * NULL (rd_count == 0) if there are no matching records;
+ * the handle is afterwards invalid
* @param proc_cls closure for @a proc
* @return a handle that can be used to
* cancel
*/
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_zone_to_name (struct GNUNET_NAMESTORE_Handle *h,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
- const struct GNUNET_CRYPTO_EcdsaPublicKey *value_zone,
- GNUNET_NAMESTORE_RecordMonitor proc, void *proc_cls);
+ const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
+ const struct
+ GNUNET_CRYPTO_EcdsaPublicKey *value_zone,
+ GNUNET_SCHEDULER_TaskCallback error_cb,
+ void *error_cb_cls,
+ GNUNET_NAMESTORE_RecordMonitor proc,
+ void *proc_cls);
/**
/**
* Starts a new zone iteration (used to periodically PUT all of our
- * records into our DHT). This MUST lock the struct GNUNET_NAMESTORE_Handle
- * for any other calls than #GNUNET_NAMESTORE_zone_iterator_next and
+ * records into our DHT). This MUST lock the `struct GNUNET_NAMESTORE_Handle`
+ * for any other calls than #GNUNET_NAMESTORE_zone_iterator_next() and
* #GNUNET_NAMESTORE_zone_iteration_stop. @a proc will be called once
* immediately, and then again after
- * #GNUNET_NAMESTORE_zone_iterator_next is invoked.
+ * #GNUNET_NAMESTORE_zone_iterator_next() is invoked.
+ *
+ * On error (disconnect), @a error_cb will be invoked.
+ * On normal completion, @a finish_cb proc will be
+ * invoked.
*
* @param h handle to the namestore
* @param zone zone to access, NULL for all zones
+ * @param error_cb function to call on error (i.e. disconnect),
+ * the handle is afterwards invalid
+ * @param error_cb_cls closure for @a error_cb
* @param proc function to call on each name from the zone; it
* will be called repeatedly with a value (if available)
- * and always once at the end with a label of NULL.
* @param proc_cls closure for @a proc
+ * @param finish_cb function to call on completion
+ * the handle is afterwards invalid
+ * @param finish_cb_cls closure for @a finish_cb
* @return an iterator handle to use for iteration
*/
struct GNUNET_NAMESTORE_ZoneIterator *
GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
- GNUNET_NAMESTORE_RecordMonitor proc,
- void *proc_cls);
+ const struct
+ GNUNET_CRYPTO_EcdsaPrivateKey *zone,
+ GNUNET_SCHEDULER_TaskCallback error_cb,
+ void *error_cb_cls,
+ GNUNET_NAMESTORE_RecordMonitor proc,
+ void *proc_cls,
+ GNUNET_SCHEDULER_TaskCallback finish_cb,
+ void *finish_cb_cls);
/**
* for the next record.
*
* @param it the iterator
+ * @param limit number of records to return to the iterator in one shot
+ * (before #GNUNET_NAMESTORE_zone_iterator_next is to be called again)
*/
void
-GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it);
+GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it,
+ uint64_t limit);
/**
struct GNUNET_NAMESTORE_ZoneMonitor;
-/**
- * Function called once the monitor has caught up with the current
- * state of the database. Will be called AGAIN after each disconnect
- * (record monitor called with 'NULL' for zone_key) once we're again
- * in sync.
- *
- * @param cls closure
- */
-typedef void
-(*GNUNET_NAMESTORE_RecordsSynchronizedCallback)(void *cls);
-
-
/**
* Begin monitoring a zone for changes. Will first call the @a
* monitor function on all existing records in the selected zone(s) if
* @a iterate_first is #GNUNET_YES. In any case, we will then call @a
* sync_cb, and then afterwards call the @a monitor whenever a record
- * changes. If the namestore disconnects, the @a monitor function is
- * called with a disconnect event; if the connection is
+ * changes. If the namestore disconnects, the @a error_cb function is
+ * called with a disconnect event. Once the connection is
* re-established, the process begins from the start (depending on @a
- * iterate_first, we first do all existing records, then @a sync, then
- * updates).
+ * iterate_first, we will again first do all existing records, then @a
+ * sync, then updates).
*
* @param cfg configuration to use to connect to namestore
* @param zone zone to monitor, NULL for all zones
* @param iterate_first #GNUNET_YES to first iterate over all existing records,
* #GNUNET_NO to only return changes that happen from now on
- * @param monitor function to call on zone changes
+ * @param error_cb function to call on error (i.e. disconnect); note that
+ * unlike the other error callbacks in this API, a call to this
+ * function does NOT destroy the monitor handle, it merely signals
+ * that monitoring is down. You need to still explicitly call
+ * #GNUNET_NAMESTORE_zone_monitor_stop().
+ * @param error_cb_cls closure for @a error_cb
+ * @param monitor function to call on zone changes, with an initial limit of 1
+ * @param monitor_cls closure for @a monitor
* @param sync_cb function called when we're in sync with the namestore
- * @param cls closure for @a monitor and @a sync_cb
+ * @param sync_cb_cls closure for @a sync_cb
* @return handle to stop monitoring
*/
struct GNUNET_NAMESTORE_ZoneMonitor *
-GNUNET_NAMESTORE_zone_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone,
+GNUNET_NAMESTORE_zone_monitor_start (const struct
+ GNUNET_CONFIGURATION_Handle *cfg,
+ const struct
+ GNUNET_CRYPTO_EcdsaPrivateKey *zone,
int iterate_first,
- GNUNET_NAMESTORE_RecordMonitor monitor,
- GNUNET_NAMESTORE_RecordsSynchronizedCallback sync_cb,
- void *cls);
+ GNUNET_SCHEDULER_TaskCallback error_cb,
+ void *error_cb_cls,
+ GNUNET_NAMESTORE_RecordMonitor monitor,
+ void *monitor_cls,
+ GNUNET_SCHEDULER_TaskCallback sync_cb,
+ void *sync_cb_cls);
+
+
+/**
+ * Calls the monitor processor specified in #GNUNET_NAMESTORE_zone_monitor_start
+ * for the next record(s). This function is used to allow clients that merely
+ * monitor the NAMESTORE to still throttle namestore operations, so we can be
+ * sure that the monitors can keep up.
+ *
+ * Note that #GNUNET_NAMESTORE_records_store() only waits for this
+ * call if the previous limit set by the client was already reached.
+ * Thus, by using a @a limit greater than 1, monitors basically enable
+ * a queue of notifications to be processed asynchronously with some
+ * delay. Note that even with a limit of 1 the
+ * #GNUNET_NAMESTORE_records_store() function will run asynchronously
+ * and the continuation may be invoked before the monitors completed
+ * (or even started) processing the notification. Thus, monitors will
+ * only closely track the current state of the namestore, but not
+ * be involved in the transactions.
+ *
+ * @param zm the monitor
+ * @param limit number of records to return to the iterator in one shot
+ * (before #GNUNET_NAMESTORE_zone_monitor_next is to be called again)
+ */
+void
+GNUNET_NAMESTORE_zone_monitor_next (struct GNUNET_NAMESTORE_ZoneMonitor *zm,
+ uint64_t limit);
/**
projects / oweals / gnunet.git / blobdiff