/*
This file is part of GNUnet
- (C) 2004, 2005, 2006, 2008, 2009 Christian Grothoff (and other contributing authors)
+ (C) 2004, 2005, 2006, 2008, 2009, 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
#define GNUNET_DHT_SERVICE_H
#include "gnunet_util_lib.h"
+#include "gnunet_block_lib.h"
#include "gnunet_hello_lib.h"
#ifdef __cplusplus
/**
- * Connection to the DHT service.
+ * Default republication frequency for stored data in the DHT.
*/
-struct GNUNET_DHT_Handle;
+#define GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 60)
+
+
/**
- * Handle to control a route operation.
+ * Connection to the DHT service.
*/
-struct GNUNET_DHT_RouteHandle;
+struct GNUNET_DHT_Handle;
/**
* Handle to control a get operation.
/**
- * Iterator called on each result obtained from a generic route
- * operation
+ * Options for routing.
*/
-typedef void (*GNUNET_DHT_MessageCallback)(void *cls,
- int code);
+enum GNUNET_DHT_RouteOption
+{
+ /**
+ * Default. Do nothing special.
+ */
+ GNUNET_DHT_RO_NONE = 0,
+
+ /**
+ * Each peer along the way should look at 'enc' (otherwise
+ * only the k-peers closest to the key should look at it).
+ */
+ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE = 1,
+
+ /**
+ * We should keep track of the route that the message
+ * took in the P2P network.
+ */
+ GNUNET_DHT_RO_RECORD_ROUTE = 2,
+
+ /**
+ * This is a 'FIND-PEER' request, so approximate results are fine.
+ */
+ GNUNET_DHT_RO_FIND_PEER = 4,
+
+ /**
+ * Possible message option for query key randomization.
+ */
+ GNUNET_DHT_RO_BART = 8
+};
+
/**
* Initialize the connection with the DHT service.
*
- * @param sched scheduler to use
* @param cfg configuration to use
* @param ht_len size of the internal hash table to use for
* processing multiple GET/FIND requests in parallel
* @return NULL on error
*/
struct GNUNET_DHT_Handle *
-GNUNET_DHT_connect (struct GNUNET_SCHEDULER_Handle *sched,
- const struct GNUNET_CONFIGURATION_Handle *cfg,
+GNUNET_DHT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
unsigned int ht_len);
GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle);
+/* *************** Standard API: get and put ******************* */
+
/**
- * Perform a PUT operation on the DHT identified by 'table' storing
- * a binding of 'key' to 'value'. The peer does not have to be part
- * of the table (if so, we will attempt to locate a peer that is!)
+ * Perform a PUT operation storing data in the DHT.
*
* @param handle handle to DHT service
* @param key the key to store under
+ * @param desired_replication_level estimate of how many
+ * nearest peers this request should reach
+ * @param options routing options for this message
* @param type type of the value
* @param size number of bytes in data; must be less than 64k
* @param data the data to store
- * @param exp desired expiration time for the data
- * @param timeout when to abort with an error if we fail to get
- * a confirmation for the PUT from the local DHT service
- * @param cont continuation to call when done;
- * reason will be TIMEOUT on error,
- * reason will be PREREQ_DONE on success
+ * @param exp desired expiration time for the value
+ * @param timeout how long to wait for transmission of this request
+ * @param cont continuation to call when done (transmitting request to service)
* @param cont_cls closure for cont
*/
void
-GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle,
- const GNUNET_HashCode * key,
- uint32_t type,
- uint32_t size,
- const char *data,
+GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const GNUNET_HashCode * key,
+ uint32_t desired_replication_level,
+ enum GNUNET_DHT_RouteOption options,
+ enum GNUNET_BLOCK_Type type, size_t size, const char *data,
struct GNUNET_TIME_Absolute exp,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_SCHEDULER_Task cont,
+ struct GNUNET_TIME_Relative timeout, GNUNET_SCHEDULER_Task cont,
void *cont_cls);
* @param cls closure
* @param exp when will this value expire
* @param key key of the result
+ * @param get_path peers on reply path (or NULL if not recorded)
+ * @param get_path_length number of entries in get_path
+ * @param put_path peers on the PUT path (or NULL if not recorded)
+ * @param put_path_length number of entries in get_path
* @param type type of the result
* @param size number of bytes in data
* @param data pointer to the result data
*/
-typedef void (*GNUNET_DHT_GetIterator)(void *cls,
- struct GNUNET_TIME_Absolute exp,
- const GNUNET_HashCode * key,
- uint32_t type,
- uint32_t size,
- const void *data);
+typedef void (*GNUNET_DHT_GetIterator) (void *cls,
+ struct GNUNET_TIME_Absolute exp,
+ const GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *
+ get_path, unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *
+ put_path, unsigned int put_path_length,
+ enum GNUNET_BLOCK_Type type,
+ size_t size, const void *data);
/**
- * Perform an asynchronous GET operation on the DHT.
+ * Perform an asynchronous GET operation on the DHT identified. See
+ * also "GNUNET_BLOCK_evaluate".
*
* @param handle handle to the DHT service
- * @param timeout timeout for this request to be sent to the
- * service (this is NOT a timeout for receiving responses)
- * @param type expected type of the response object (GNUNET_BLOCK_TYPE_*)
+ * @param timeout how long to wait for transmission of this request to the service
+ * @param type expected type of the response object
* @param key the key to look up
+ * @param desired_replication_level estimate of how many
+ nearest peers this request should reach
+ * @param options routing options for this message
+ * @param xquery extended query data (can be NULL, depending on type)
+ * @param xquery_size number of bytes in xquery
* @param iter function to call on each result
* @param iter_cls closure for iter
- * @param cont continuation to call once message sent (and it is now
- * safe to do another operation on the DHT)
- * @param cont_cls closure for continuation
- * @return handle to stop the async get, NULL on error (two
- * concurrent operations scheduled)
+ *
+ * @return handle to stop the async get
*/
struct GNUNET_DHT_GetHandle *
GNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle,
struct GNUNET_TIME_Relative timeout,
- uint32_t type,
- const GNUNET_HashCode * key,
- GNUNET_DHT_GetIterator iter,
- void *iter_cls,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
+ enum GNUNET_BLOCK_Type type, const GNUNET_HashCode * key,
+ uint32_t desired_replication_level,
+ enum GNUNET_DHT_RouteOption options, const void *xquery,
+ size_t xquery_size, GNUNET_DHT_GetIterator iter,
+ void *iter_cls);
/**
* Stop async DHT-get. Frees associated resources.
*
* @param get_handle GET operation to stop.
- * @param cont continuation to call once this message is sent to the service
- * @param cont_cls closure for the continuation
- */
-void
-GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
-
-
-/**
- * Options for routing.
- */
-enum GNUNET_DHT_RouteOption
- {
- /**
- * Default. Do nothing special.
- */
- GNUNET_DHT_RO_NONE = 0,
-
- /**
- * Each peer along the way should look at 'enc' (otherwise
- * only the k-peers closest to the key should look at it).
- */
- GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE = 1
- };
-
-
-/**
- * Iterator called on each result obtained from a find peer
- * operation
- *
- * @param cls closure
- * @param peer hello of a target (peer near key)
- */
-typedef void (*GNUNET_DHT_FindPeerProcessor)(void *cls,
- const struct GNUNET_HELLO_Message *peer);
-
-
-/**
- * Perform an asynchronous FIND PEER operation on the DHT.
- *
- * @param handle handle to the DHT service
- * @param timeout timeout for this request to be sent to the
- * service
- * @param options routing options for this message
- * @param key the key to look up
- * @param proc function to call on each result
- * @param proc_cls closure for proc
- * @param cont continuation to call once message sent
- * @param cont_cls closure for continuation
- * @return handle to stop the async get, NULL on error
- */
-struct GNUNET_DHT_FindPeerHandle *
-GNUNET_DHT_find_peer_start (struct GNUNET_DHT_Handle *handle,
- struct GNUNET_TIME_Relative timeout,
- enum GNUNET_DHT_RouteOption options,
- const GNUNET_HashCode * key,
- GNUNET_DHT_FindPeerProcessor proc,
- void *proc_cls,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
-
-
-/**
- * Stop async find peer. Frees associated resources.
- *
- * @param find_peer_handle GET operation to stop.
- * @param cont continuation to call once this message is sent to the service
- * @param cont_cls closure for the continuation
- */
-void
-GNUNET_DHT_find_peer_stop (struct GNUNET_DHT_FindPeerHandle *find_peer_handle,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
-
-
-/**
- * Iterator called on each result obtained from a generic route
- * operation
- *
- * @param cls closure
- * @param reply response
- */
-typedef void (*GNUNET_DHT_ReplyProcessor)(void *cls,
- const struct GNUNET_MessageHeader *reply);
-
-
-/**
- * Perform an asynchronous ROUTE_START operation on the DHT.
- *
- * @param handle handle to the DHT service
- * @param key the key to look up
- * @param desired_replication_level how many peers should ultimately receive
- * this message (advisory only, target may be too high for the
- * given DHT or not hit exactly).
- * @param options options for routing
- * @param enc send the encapsulated message to a peer close to the key
- * @param timeout when to abort with an error if we fail to get
- * a confirmation for the request (when necessary) or how long
- * to wait for transmission to the service
- * @param iter function to call on each result, NULL if no replies are expected
- * @param iter_cls closure for iter
- * @param cont continuation to call when done, GNUNET_SYSERR if failed
- * GNUNET_OK otherwise
- * @param cont_cls closure for cont
- * @return handle to stop the request
- */
-struct GNUNET_DHT_RouteHandle *
-GNUNET_DHT_route_start (struct GNUNET_DHT_Handle *handle,
- const GNUNET_HashCode *key,
- unsigned int desired_replication_level,
- enum GNUNET_DHT_RouteOption options,
- const struct GNUNET_MessageHeader *enc,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_DHT_ReplyProcessor iter,
- void *iter_cls,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
-
-
-/**
- * Stop async route stop. Frees associated resources.
*
- * @param route_handle operation to stop.
- * @param cont continuation to call once this message is sent to the service
- * @param cont_cls closure for the continuation
+ * On return get_handle will no longer be valid, caller
+ * must not use again!!!
*/
void
-GNUNET_DHT_route_stop (struct GNUNET_DHT_RouteHandle *route_handle,
- GNUNET_SCHEDULER_Task cont,
- void *cont_cls);
+GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle);
#if 0 /* keep Emacsens' auto-indent happy */
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