X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Finclude%2Fgnunet_namestore_service.h;h=7ab619c5127d6ed62668d0b5bce5955233d67b1b;hb=ec50a665dc884f7997419d0351ae8ade9c1aeabe;hp=fe406abd97eceb5e613e75ade476eabd09e6e3b0;hpb=3101c3cb4276e33edacdf5cb5cff546d21b90cc9;p=oweals%2Fgnunet.git diff --git a/src/include/gnunet_namestore_service.h b/src/include/gnunet_namestore_service.h index fe406abd9..7ab619c51 100644 --- a/src/include/gnunet_namestore_service.h +++ b/src/include/gnunet_namestore_service.h @@ -1,39 +1,44 @@ /* This file is part of GNUnet - (C) 2012 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 2, 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. - - 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., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. + Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . */ /** - * @file include/gnunet_namestore_service.h - * @brief API that can be used to store naming information on a GNUnet node; * @author Christian Grothoff * - * Other functions we might want: - * - enumerate all known zones - * - convenience function to gather record and the full affilliated stree - * in one shot + * @file + * API that can be used to store naming information on a GNUnet node; + * + * @defgroup namestore Name Store service + * Store naming information on a GNUnet node. + * + * Naming information can either be records for which this peer/user is + * authoritative, or blocks which are cached, encrypted naming data from other + * peers. + * + * @see [Documentation](https://gnunet.org/namestore-subsystem) + * + * @{ */ - #ifndef GNUNET_NAMESTORE_SERVICE_H #define GNUNET_NAMESTORE_SERVICE_H #include "gnunet_util_lib.h" #include "gnunet_block_lib.h" +#include "gnunet_gnsrecord_lib.h" #ifdef __cplusplus extern "C" @@ -43,6 +48,7 @@ extern "C" #endif #endif + /** * Entry in the queue. */ @@ -54,9 +60,10 @@ struct GNUNET_NAMESTORE_QueueEntry; struct GNUNET_NAMESTORE_Handle; /** - * Maximum size of a value that can be stored in the namestore. + * Handle to the namestore zone iterator. */ -#define GNUNET_NAMESTORE_MAX_VALUE_SIZE (63 * 1024) +struct GNUNET_NAMESTORE_ZoneIterator; + /** * Connect to the namestore service. @@ -69,14 +76,14 @@ GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg); /** - * Disconnect from the namestore service (and free - * associated resources). + * Disconnect from the namestore service (and free associated + * resources). Must not be called from within operation callbacks of + * the API. * * @param h handle to the namestore - * @param drop set to GNUNET_YES to delete all data in namestore (!) */ void -GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h, int drop); +GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h); /** @@ -84,449 +91,283 @@ GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h, int drop); * operation. * * @param cls closure - * @param success GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate) - * GNUNET_NO if content was already there - * GNUNET_YES (or other positive value) on success + * @param success #GNUNET_SYSERR on failure (including timeout/queue drop/failure to validate) + * #GNUNET_NO if content was already there or not found + * #GNUNET_YES (or other positive value) on success * @param emsg NULL on success, otherwise an error message */ -typedef void (*GNUNET_NAMESTORE_ContinuationWithStatus) (void *cls, - int32_t success, - const char *emsg); +typedef void +(*GNUNET_NAMESTORE_ContinuationWithStatus) (void *cls, + int32_t success, + const char *emsg); /** - * Flags that can be set for a record. - */ -enum GNUNET_NAMESTORE_RecordFlags -{ - - /** - * No special options. - */ - GNUNET_NAMESTORE_RF_NONE = 0, - - /** - * This peer is the authority for this record; it must thus - * not be deleted (other records can be deleted if we run - * out of space). - */ - GNUNET_NAMESTORE_RF_AUTHORITY = 1, - - /** - * This is a private record of this peer and it should - * thus not be handed out to other peers. - */ - GNUNET_NAMESTORE_RF_PRIVATE = 2 - -}; - - -/** - * We formally store records in a B-tree for signing. This struct - * identifies the location of a record in the B-tree. - */ -struct GNUNET_NAMESTORE_SignatureLocation -{ - /** - * Offset in the B-tree. - */ - uint64_t offset; - - /** - * Depth in the B-tree. - */ - uint32_t depth; - - /** - * Revision of the B-tree. - */ - uint32_t revision; -}; - - -/** - * Continuation called to notify client about result of the - * signing operation. - * - * @param cls closure - * @param sig where the signature is now located in the S-tree - */ -typedef void (*GNUNET_NAMESTORE_ContinuationWithSignature) (void *cls, - const struct GNUNET_NAMESTORE_SignatureLocation *sig); - - - - - -/** - * Get the hash of a record (what will be signed in the Stree for - * the record). - * - * @param zone hash of the public key of the zone - * @param name name that is being mapped (at most 255 characters long) - * @param record_type type of the record (A, AAAA, PKEY, etc.) - * @param expiration expiration time for the content - * @param flags flags for the content - * @param data_size number of bytes in data - * @param data value, semantics depend on 'record_type' (see RFCs for DNS and - * GNS specification for GNS extensions) - * @param record_hash hash of the record (set) - */ -void -GNUNET_NAMESTORE_record_hash (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const char *name, - uint32_t record_type, - struct GNUNET_TIME_Absolute expiration, - enum GNUNET_NAMESTORE_RecordFlags flags, - size_t data_size, - const void *data, - GNUNET_HashCode *record_hash); - - -/** - * Sign a record. This function is used by the authority of the zone - * to add a record. + * Store an item in the namestore. If the item is already present, + * it is replaced with the new record. Use an empty array to + * remove all records under the given name. * - * @param h handle to the namestore - * @param zone_privkey private key of the zone - * @param record_hash hash of the record to be signed - * @param cont continuation to call when done - * @param cont_cls closure for cont - * @return handle to abort the request - */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_stree_extend (struct GNUNET_NAMESTORE_Handle *h, - const struct GNUNET_CRYPTO_RsaPrivateKey *zone_privkey, - const GNUNET_HashCode *record_hash, - GNUNET_NAMESTORE_ContinuationWithSignature cont, - void *cont_cls); - - -/** - * Rebalance the signature tree of our zone. This function should - * be called "rarely" to rebalance the tree. + * 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 zone_privkey private key for the zone to rebalance + * @param pkey private key of the zone + * @param label name that is being mapped + * @param rd_count number of records in the 'rd' array + * @param rd array of records with data to store * @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 * -GNUNET_NAMESTORE_stree_rebalance (struct GNUNET_NAMESTORE_Handle *h, - const struct GNUNET_CRYPTO_RsaPrivateKey *zone_privkey, - GNUNET_NAMESTORE_ContinuationWithStatus cont, - void *cont_cls); +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); /** - * Provide the root of a signature tree. This function is - * used by non-authorities as the first operation when - * adding a foreign zone. + * Process a record that was stored in the namestore. * - * @param h handle to the namestore - * @param zone_key public key of the zone - * @param signature signature of the top-level entry of the zone - * @param revision revision number of the zone - * @param top_hash top-level hash of the zone - * @param cont continuation to call when done - * @param cont_cls closure for cont - * @return handle to abort the request + * @param cls closure + * @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 */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_stree_start (struct GNUNET_NAMESTORE_Handle *h, - const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key, - const struct GNUNET_CRYPTO_RsaSignature *signature, - uint32_t revision, - const GNUNET_HashCode *top_hash, - GNUNET_NAMESTORE_ContinuationWithSignature cont, - void *cont_cls); +typedef void +(*GNUNET_NAMESTORE_RecordMonitor) (void *cls, + const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone, + const char *label, + unsigned int rd_count, + const struct GNUNET_GNSRECORD_Data *rd); /** - * Store part of a signature B-tree in the namestore. This function - * is used by non-authorities to cache parts of a zone's signature tree. - * Note that the tree must be build top-down. This function must check - * that the nodes being added are valid, and if not refuse the operation. + * Set the desired nick name for a zone * * @param h handle to the namestore - * @param zone_key public key of the zone - * @param loc location in the B-tree - * @param ploc parent's location in the B-tree (must have depth = loc.depth - 1) - * @param num_entries number of entries at this node in the B-tree - * @param entries the 'num_entries' entries to store (hashes over the - * records) + * @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 * -GNUNET_NAMESTORE_stree_put (struct GNUNET_NAMESTORE_Handle *h, - const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key, - const struct GNUNET_NAMESTORE_SignatureLocation *loc, - const struct GNUNET_NAMESTORE_SignatureLocation *ploc, - unsigned int num_entries, - const GNUNET_HashCode *entries, - GNUNET_NAMESTORE_ContinuationWithStatus cont, - void *cont_cls); +GNUNET_NAMESTORE_set_nick (struct GNUNET_NAMESTORE_Handle *h, + const struct GNUNET_CRYPTO_EcdsaPrivateKey *pkey, + const char *nick, + GNUNET_NAMESTORE_ContinuationWithStatus cont, + void *cont_cls); /** - * Store current zone signature in the namestore. This function - * is used by non-authorities to cache the top of a zone's signature tree. - * Note that the tree must be build top-down, so this function is called - * first for a given zone and revision. + * Lookup an item in the namestore. * * @param h handle to the namestore - * @param zone_key public key of the zone - * @param loc identifies the top of the B-tree (depth and revision) - * @param time time of the signature creation - * @param top_sig signature at the top - * @param root_hash top level hash code in the Merkle-tree / stree - * @param cont continuation to call when done - * @param cont_cls closure for cont + * @param pkey private key of the zone + * @param label name that is being mapped + * @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_signature_put (struct GNUNET_NAMESTORE_Handle *h, - const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key, - const struct GNUNET_NAMESTORE_SignatureLocation *loc, - struct GNUNET_TIME_Absolute time, - const struct GNUNET_CRYPTO_RsaSignature *top_sig, - const GNUNET_HashCode *root_hash, - GNUNET_NAMESTORE_ContinuationWithStatus cont, - void *cont_cls); +GNUNET_NAMESTORE_records_lookup (struct GNUNET_NAMESTORE_Handle *h, + 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); /** - * Store an item in the namestore. If the item is already present, - * the expiration time is updated to the max of the existing time and - * the new time. The operation must fail if there is no matching - * entry in the signature tree. + * Look for an existing PKEY delegation record for a given public key. + * Returns at most one result to the processor. * * @param h handle to the namestore - * @param zone hash of the public key of the zone - * @param name name that is being mapped (at most 255 characters long) - * @param record_type type of the record (A, AAAA, PKEY, etc.) - * @param expiration expiration time for the content - * @param flags flags for the content - * @param sig_loc where is the information about the signature for this record stored? - * @param data_size number of bytes in data - * @param data value, semantics depend on 'record_type' (see RFCs for DNS and - * GNS specification for GNS extensions) - * @param cont continuation to call when done - * @param cont_cls closure for cont - * @return handle to abort the request + * @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; + * 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_record_put (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const char *name, - uint32_t record_type, - struct GNUNET_TIME_Absolute expiration, - enum GNUNET_NAMESTORE_RecordFlags flags, - const struct GNUNET_NAMESTORE_SignatureLocation *sig_loc, - size_t data_size, - const void *data, - GNUNET_NAMESTORE_ContinuationWithStatus cont, - void *cont_cls); +GNUNET_NAMESTORE_zone_to_name (struct GNUNET_NAMESTORE_Handle *h, + 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); /** - * Explicitly remove some content from the database. The - * "cont"inuation will be called with status "GNUNET_OK" if content - * was removed, "GNUNET_NO" if no matching entry was found and - * "GNUNET_SYSERR" on all other types of errors. + * Cancel a namestore operation. The final callback from the + * operation must not have been done yet. Must be called on any + * namestore operation that has not yet completed prior to calling + * #GNUNET_NAMESTORE_disconnect. * - * @param h handle to the namestore - * @param zone hash of the public key of the zone - * @param name name that is being mapped (at most 255 characters long) - * @param record_type type of the record (A, AAAA, PKEY, etc.) - * @param size number of bytes in data - * @param data content stored - * @param cont continuation to call when done - * @param cont_cls closure for cont - * @return handle to abort the request + * @param qe operation to cancel */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_record_remove (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const char *name, - uint32_t record_type, - size_t size, - const void *data, - GNUNET_NAMESTORE_ContinuationWithStatus cont, - void *cont_cls); +void +GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe); /** - * Process a record that was stored in the namestore. + * 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 + * #GNUNET_NAMESTORE_zone_iteration_stop. @a proc will be called once + * immediately, and then again after + * #GNUNET_NAMESTORE_zone_iterator_next() is invoked. * - * @param cls closure - * @param zone hash of the public key of the zone - * @param name name that is being mapped (at most 255 characters long) - * @param record_type type of the record (A, AAAA, PKEY, etc.) - * @param expiration expiration time for the content - * @param flags flags for the content - * @param sig_loc where is the information about the signature for this record stored? - * @param size number of bytes in data - * @param data content stored - */ -typedef void (*GNUNET_NAMESTORE_RecordProcessor) (void *cls, - const GNUNET_HashCode *zone, - const char *name, - uint32_t record_type, - struct GNUNET_TIME_Absolute expiration, - enum GNUNET_NAMESTORE_RecordFlags flags, - const struct GNUNET_NAMESTORE_SignatureLocation *sig_loc, - size_t size, const void *data); - - -/** - * Get a result for a particular key from the namestore. The processor - * will only be called once. + * 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 look up a record from - * @param name name to look up - * @param record_type desired record type - * @param proc function to call on each matching value; - * will be called once with a NULL value at the end - * @param proc_cls closure for proc - * @return a handle that can be used to - * cancel + * @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) + * @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_QueueEntry * -GNUNET_NAMESTORE_lookup_name (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const char *name, - uint32_t record_type, - GNUNET_NAMESTORE_RecordProcessor proc, void *proc_cls); - +struct GNUNET_NAMESTORE_ZoneIterator * +GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h, + 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); /** - * Get the hash of a subtree in the STree (what will be signed in the parent - * location). FIXME naming conflict! + * Calls the record processor specified in #GNUNET_NAMESTORE_zone_iteration_start + * for the next record. * - * @param zone hash of the public key of the zone - * @param loc where we are in the signature tree - * @param num_entries number of entries being stored here - * @param entries the entries themselves - * @param st_hash hash of the stree node (set) + * @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_record_hash_dup (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const struct GNUNET_NAMESTORE_SignatureLocation *loc, - unsigned int num_entries, - const GNUNET_HashCode *entries, - GNUNET_HashCode *st_hash); +GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it, + uint64_t limit); /** - * Process a Stree node that was stored in the namestore. + * Stops iteration and releases the namestore handle for further calls. Must + * be called on any iteration that has not yet completed prior to calling + * #GNUNET_NAMESTORE_disconnect. * - * @param cls closure - * @param zone hash of the public key of the zone - * @param loc where we are in the signature tree - * @param ploc location of our parent in the signature tree - * @param num_entries number of entries being stored here - * @param entries the entries themselves + * @param it the iterator */ -typedef void (*GNUNET_NAMESTORE_StreeProcessor) (void *cls, - const GNUNET_HashCode *zone, - const struct GNUNET_NAMESTORE_SignatureLocation *loc, - const struct GNUNET_NAMESTORE_SignatureLocation *ploc, - unsigned int num_entries, - const GNUNET_HashCode *entries); - +void +GNUNET_NAMESTORE_zone_iteration_stop (struct GNUNET_NAMESTORE_ZoneIterator *it); -/** - * Obtain part of a signature B-tree. The processor - * will only be called once. - * - * @param h handle to the namestore - * @param zone zone to look up a record from - * @param sig_loc location to look up - * @param proc function to call on each matching value; - * will be called once with a NULL value at the end - * @param proc_cls closure for proc - * @return a handle that can be used to - * cancel - */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_lookup_stree (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - const struct GNUNET_NAMESTORE_SignatureLocation *sig_loc, - GNUNET_NAMESTORE_StreeProcessor proc, void *proc_cls); /** - * Process zone signature information that was stored in the namestore. - * - * @param cls closure - * @param zone hash of the public key of the zone - * @param loc where we are in the signature tree (identifies top) - * @param top_sig signature at the root - * @param time timestamp of the signature - * @param top_hash hash at the top of the tree + * Handle for a monitoring activity. */ -typedef void (*GNUNET_NAMESTORE_SignatureProcessor) (void *cls, - const GNUNET_HashCode *zone, - const struct GNUNET_NAMESTORE_SignatureLocation *loc, - const struct GNUNET_CRYPTO_RsaSignature *top_sig, - struct GNUNET_TIME_Absolute time, - const GNUNET_HashCode *top_hash); +struct GNUNET_NAMESTORE_ZoneMonitor; /** - * Obtain latest/current signature of a zone. The processor - * will only be called once. + * 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 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 will again first do all existing records, then @a + * sync, then updates). * - * @param h handle to the namestore - * @param zone zone to look up a record from - * @param proc function to call on each matching value; - * will be called once with a NULL value at the end - * @param proc_cls closure for proc - * @return a handle that can be used to - * cancel + * @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 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 sync_cb_cls closure for @a sync_cb + * @return handle to stop monitoring */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_lookup_signature (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - GNUNET_NAMESTORE_SignatureProcessor proc, void *proc_cls); +struct GNUNET_NAMESTORE_ZoneMonitor * +GNUNET_NAMESTORE_zone_monitor_start (const struct GNUNET_CONFIGURATION_Handle *cfg, + const struct GNUNET_CRYPTO_EcdsaPrivateKey *zone, + int iterate_first, + 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); /** - * Get all records of a zone. + * 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. * - * @param h handle to the namestore - * @param zone zone to access - * @param proc function to call on a random value; it - * will be called repeatedly with a value (if available) - * and always once at the end with a zone and name of NULL. - * @param proc_cls closure for proc - * @return a handle that can be used to - * cancel + * 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) */ -struct GNUNET_NAMESTORE_QueueEntry * -GNUNET_NAMESTORE_zone_transfer (struct GNUNET_NAMESTORE_Handle *h, - const GNUNET_HashCode *zone, - GNUNET_NAMESTORE_RecordProcessor proc, - void *proc_cls); - - +void +GNUNET_NAMESTORE_zone_monitor_next (struct GNUNET_NAMESTORE_ZoneMonitor *zm, + uint64_t limit); /** - * Cancel a namestore operation. The final callback from the - * operation must not have been done yet. + * Stop monitoring a zone for changes. * - * @param qe operation to cancel + * @param zm handle to the monitor activity to stop */ void -GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe); +GNUNET_NAMESTORE_zone_monitor_stop (struct GNUNET_NAMESTORE_ZoneMonitor *zm); #if 0 /* keep Emacsens' auto-indent happy */ @@ -536,5 +377,6 @@ GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe); } #endif -/* end of gnunet_namestore_service.h */ #endif + +/** @} */ /* end of group */