more wild hxing

1 files changed, 211 insertions, 0 deletions

diff --git a/src/dht/gnunet-service-dht_routing.c b/src/dht/gnunet-service-dht_routing.c
new file mode 100644
index 000000000..535a63267
--- /dev/null
+++ b/src/dht/gnunet-service-dht_routing.c
@@ -0,0 +1,211 @@
+/*
+     This file is part of GNUnet.
+     (C) 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
+     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
+     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.
+*/
+
+/**
+ * @file dht/gnunet-service-dht_routing.c
+ * @brief GNUnet DHT tracking of requests for routing replies
+ * @author Christian Grothoff
+ */
+
+#include "gnunet-service-dht_routing.h"
+
+
+/**
+ * Number of requests we track at most (for routing replies).
+ */
+#define DHT_MAX_RECENT (1024 * 16)
+
+
+/**
+ * Information we keep about all recent GET requests
+ * so that we can route replies.
+ */
+struct RecentRequest
+{
+
+  /**
+   * The peer this request was received from.
+   */
+  struct GNUNET_PeerIdentity peer;
+
+  /**
+   * Position of this node in the min heap.
+   */
+  struct GNUNET_CONTAINER_HeapNode *heap_node;
+
+  /**
+   * Bloomfilter for replies to drop.
+   */
+  struct GNUNET_CONTAINER_BloomFilter *reply_bf;
+
+  /**
+   * Timestamp of this request, for ordering
+   * the min heap.
+   */
+  struct GNUNET_TIME_Absolute timestamp;
+
+  /**
+   * Type of the requested block.
+   */
+  enum GNUNET_BLOCK_Type type;
+  
+  /**
+   * extended query (see gnunet_block_lib.h).  Allocated at the
+   * end of this struct.
+   */
+  const void *xquery;
+
+  /**
+   * Number of bytes in xquery.
+   */
+  size_t xquery_size;
+
+  /**
+   * Mutator value for the reply_bf, see gnunet_block_lib.h
+   */
+  uint32_t reply_bf_mutator;
+
+  /**
+   * Key of this request.
+   */
+  GNUNET_HashCode key;
+
+};
+
+
+/**
+ * Recent requests by time inserted.
+ */
+static struct GNUNET_CONTAINER_Heap *recent_heap;
+
+/**
+ * Recently seen requests by key.
+ */
+static struct GNUNET_CONTAINER_MultiHashMap *recent_map;
+
+
+/**
+ * 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.
+ *
+ * @param type type of the block
+ * @param expiration_time when does the content expire
+ * @param key key for the content
+ * @param put_path_length number of entries in put_path
+ * @param put_path peers the original PUT traversed (if tracked)
+ * @param get_path_length number of entries in put_path
+ * @param get_path peers this reply has traversed so far (if tracked)
+ * @param data payload of the reply
+ * @param data_size number of bytes in data
+ */
+void
+GDS_ROUTING_process (enum GNUNET_BLOCK_Type type,
+                     GNUNET_TIME_Absolute expiration_time,
+                     const GNUNET_HashCode *key,
+                     unsigned int put_path_length,
+                     struct GNUNET_PeerIdentity *put_path,
+                     unsigned int get_path_length,
+                     struct GNUNET_PeerIdentity *get_path,
+                     const void *data,
+                     size_t data_size)
+{
+}
+
+
+/**
+ * Add a new entry to our routing table.
+ *
+ * @param sender peer that originated the request
+ * @param type type of the block
+ * @param key key for the content
+ * @param xquery extended query
+ * @param xquery_size number of bytes in xquery
+ * @param reply_bf bloomfilter to filter duplicates
+ * @param reply_bf_mutator mutator for reply_bf
+*/
+void
+GDS_ROUTING_add (const GNUNET_PeerIdentity *sender,
+                 enum GNUNET_BLOCK_Type type,
+                 const GNUNET_HashCode *key,
+                 const void *xquery,
+                 size_t xquery_size,
+                 const struct GNUNET_CONTAINER_BloomFilter *reply_bf,
+                 uint32_t reply_bf_mutator)
+{
+  if (GNUNET_CONTAINER_heap_get_size (recent_heap) >= DHT_MAX_RECENT)
+  {
+    recent_req = GNUNET_CONTAINER_heap_peek (recent_heap);
+    GNUNET_assert (recent_req != NULL);
+    GNUNET_SCHEDULER_cancel (recent_req->remove_task);
+    GNUNET_CONTAINER_heap_remove_node (recent_req->heap_node);
+    GNUNET_CONTAINER_bloomfilter_free (recent_req->bloom);
+    GNUNET_free (recent_req);
+  }
+
+  recent_req = GNUNET_malloc (sizeof (struct RecentRequest));
+  recent_req->uid = msg_ctx->unique_id;
+  memcpy (&recent_req->key, &msg_ctx->key, sizeof (GNUNET_HashCode));
+  recent_req->heap_node =
+    GNUNET_CONTAINER_heap_insert (recent_heap, recent_req,
+                                  GNUNET_TIME_absolute_get ().abs_value);
+  recent_req->bloom =
+    GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE, DHT_BLOOM_K);
+
+
+}
+
+
+/**
+ * Initialize routing subsystem.
+ */
+void
+GDS_ROUTING_init ()
+{
+  recent_heap =
+    GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+  recent_map =
+      GNUNET_CONTAINER_multihashmap_create (MAX_BUCKETS / 8);
+}
+
+
+/**
+ * Shutdown routing subsystem.
+ */
+void
+GDS_ROUTING_done ()
+{
+  while (GNUNET_CONTAINER_heap_get_size (recent_heap) > 0)
+  {
+    recent_req = GNUNET_CONTAINER_heap_peek (recent_heap);
+    GNUNET_assert (recent_req != NULL);
+    GNUNET_CONTAINER_heap_remove_node (recent_req->heap_node);
+    GNUNET_CONTAINER_bloomfilter_free (recent_req->bloom);
+    GNUNET_free (recent_req);
+  }
+  GNUNET_CONTAINER_heap_destroy (recent_heap);
+  recent_heap = NULL;
+  GNUNET_CONTAINER_multihashmap_destroy (recent_map);
+  recent_map = NULL;
+}
+
+/* end of gnunet-service-dht_routing.c */