gnunet-service-dht_routing.h File Reference

GNUnet DHT tracking of requests for routing replies. More...

#include "gnunet_util_lib.h"
#include "gnunet_block_lib.h"
#include "gnunet_dht_service.h"

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Functions
void	GDS_ROUTING_process (const struct GNUNET_DATACACHE_Block *bd, const struct GNUNET_HashCode *query_hash, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *get_path)
	Handle a reply (route to origin). More...
void	GDS_ROUTING_add (const struct GNUNET_PeerIdentity *sender, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *bg, enum GNUNET_DHT_RouteOption options, const struct GNUNET_HashCode *key, const void *xquery, size_t xquery_size)
	Add a new entry to our routing table. More...
void	GDS_ROUTING_init (void)
	Initialize routing subsystem. More...
void	GDS_ROUTING_done (void)
	Shutdown routing subsystem. More...

Detailed Description

GNUnet DHT tracking of requests for routing replies.

Author

Christian Grothoff

Definition in file gnunet-service-dht_routing.h.

Function Documentation

GDS_ROUTING_process()

void GDS_ROUTING_process	(	const struct GNUNET_DATACACHE_Block *	bd,
		const struct GNUNET_HashCode *	query_hash,
		unsigned int	get_path_length,
		const struct GNUNET_DHT_PathElement *	get_path
	)

Handle a reply (route to origin).

Only forwards the reply back to other peers waiting for it. Does not do local caching or forwarding to local clients. Essentially calls GDS_NEIGHBOURS_handle_reply() for all peers that sent us a matching request recently.

Parameters

bd	block details
query_hash	query used in the inquiry
get_path_length	number of entries in get_path
get_path	peers this reply has traversed so far (if tracked)

Definition at line 255 of file gnunet-service-dht_routing.c.

{
  struct ProcessContext pc = {
    .bd = bd,
    .get_path = get_path,
    .get_path_length = get_path_length
  };
 
  GNUNET_CONTAINER_multihashmap_get_multiple (recent_map,
                                              query_hash,
                                              &process,
                                              &pc);
}

References ProcessContext::bd, ProcessContext::get_path, ProcessContext::get_path_length, GNUNET_CONTAINER_multihashmap_get_multiple(), pc, process(), and recent_map.

Referenced by process_reply_with_path().

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GDS_ROUTING_add()

void GDS_ROUTING_add	(	const struct GNUNET_PeerIdentity *	sender,
		enum GNUNET_BLOCK_Type	type,
		struct GNUNET_BLOCK_Group *	bg,
		enum GNUNET_DHT_RouteOption	options,
		const struct GNUNET_HashCode *	key,
		const void *	xquery,
		size_t	xquery_size
	)

Add a new entry to our routing table.

Parameters

	sender	peer that originated the request
	type	type of the block
	bg	block group to evaluate replies, henceforth owned by routing
	options	options for processing
	key	key for the content
	xquery	extended query
	xquery_size	number of bytes in xquery
	sender	peer that originated the request
	type	type of the block
[in]	bg	block group for filtering duplicate replies
	options	options for processing
	key	key for the content
	xquery	extended query
	xquery_size	number of bytes in xquery

Definition at line 346 of file gnunet-service-dht_routing.c.

{
  struct RecentRequest *recent_req;
 
  while (GNUNET_CONTAINER_heap_get_size (recent_heap) >= DHT_MAX_RECENT)
    expire_oldest_entry ();
  GNUNET_STATISTICS_update (GDS_stats,
                            "# Entries added to routing table",
                            1,
                            GNUNET_NO);
  recent_req = GNUNET_malloc (sizeof(struct RecentRequest) + xquery_size);
  recent_req->peer = *sender;
  recent_req->key = *key;
  recent_req->bg = bg;
  recent_req->type = type;
  recent_req->options = options;
  recent_req->xquery = &recent_req[1];
  GNUNET_memcpy (&recent_req[1],
                 xquery,
                 xquery_size);
  recent_req->xquery_size = xquery_size;
  if (GNUNET_SYSERR ==
      GNUNET_CONTAINER_multihashmap_get_multiple (recent_map,
                                                  key,
                                                  &try_combine_recent,
                                                  recent_req))
  {
    GNUNET_STATISTICS_update (GDS_stats,
                              "# DHT requests combined",
                              1,
                              GNUNET_NO);
    return;
  }
  recent_req->heap_node
    = GNUNET_CONTAINER_heap_insert (
        recent_heap,
        recent_req,
        GNUNET_TIME_absolute_get ().abs_value_us);
  (void) GNUNET_CONTAINER_multihashmap_put (
    recent_map,
    key,
    recent_req,
    GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
}

References RecentRequest::bg, DHT_MAX_RECENT, expire_oldest_entry(), GDS_stats, GNUNET_CONTAINER_heap_get_size(), GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_multihashmap_get_multiple(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_malloc, GNUNET_memcpy, GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_SYSERR, GNUNET_TIME_absolute_get(), RecentRequest::heap_node, key, RecentRequest::key, options, RecentRequest::options, RecentRequest::peer, recent_heap, recent_map, try_combine_recent(), type, RecentRequest::type, RecentRequest::xquery, and RecentRequest::xquery_size.

Referenced by handle_dht_p2p_get().

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GDS_ROUTING_init()

void GDS_ROUTING_init

(

void

)

Initialize routing subsystem.

Definition at line 402 of file gnunet-service-dht_routing.c.

{
  recent_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
  recent_map = GNUNET_CONTAINER_multihashmap_create (DHT_MAX_RECENT * 4 / 3,
                                                     GNUNET_NO);
}

References DHT_MAX_RECENT, GNUNET_CONTAINER_heap_create(), GNUNET_CONTAINER_HEAP_ORDER_MIN, GNUNET_CONTAINER_multihashmap_create(), GNUNET_NO, recent_heap, and recent_map.

Referenced by run().

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GDS_ROUTING_done()

void GDS_ROUTING_done

(

void

)

Shutdown routing subsystem.

Definition at line 414 of file gnunet-service-dht_routing.c.

{
  while (GNUNET_CONTAINER_heap_get_size (recent_heap) > 0)
    expire_oldest_entry ();
  GNUNET_assert (0 ==
                 GNUNET_CONTAINER_heap_get_size (recent_heap));
  GNUNET_CONTAINER_heap_destroy (recent_heap);
  recent_heap = NULL;
  GNUNET_assert (0 ==
                 GNUNET_CONTAINER_multihashmap_size (recent_map));
  GNUNET_CONTAINER_multihashmap_destroy (recent_map);
  recent_map = NULL;
}

References expire_oldest_entry(), GNUNET_assert, GNUNET_CONTAINER_heap_destroy(), GNUNET_CONTAINER_heap_get_size(), GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_size(), recent_heap, and recent_map.

Referenced by shutdown_task().

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