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path: root/src/fs/gnunet-service-fs_pr.c
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/*
     This file is part of GNUnet.
     (C) 2009, 2010, 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 fs/gnunet-service-fs_pr.c
 * @brief API to handle pending requests
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_load_lib.h"
#include "gnunet-service-fs.h"
#include "gnunet-service-fs_cp.h"
#include "gnunet-service-fs_indexing.h"
#include "gnunet-service-fs_pe.h"
#include "gnunet-service-fs_pr.h"

/**
 * Maximum size of the datastore queue for P2P operations.  Needs to
 * be large enough to queue MAX_QUEUE_PER_PEER operations for roughly
 * the number of active (connected) peers.
 */
#define MAX_DATASTORE_QUEUE (16 * MAX_QUEUE_PER_PEER)

/**
 * Bandwidth value of a 0-priority content (must be fairly high
 * compared to query since content is typically significantly larger
 * -- and more valueable since it can take many queries to get one
 * piece of content).
 */
#define CONTENT_BANDWIDTH_VALUE 800

/**
 * Hard limit on the number of results we may get from the datastore per query.
 */
#define MAX_RESULTS (100 * 1024)

/**
 * An active request.
 */
struct GSF_PendingRequest
{
  /**
   * Public data for the request.
   */
  struct GSF_PendingRequestData public_data;

  /**
   * Function to call if we encounter a reply.
   */
  GSF_PendingRequestReplyHandler rh;

  /**
   * Closure for 'rh'
   */
  void *rh_cls;

  /**
   * Array of hash codes of replies we've already seen.
   */
  GNUNET_HashCode *replies_seen;

  /**
   * Bloomfilter masking replies we've already seen.
   */
  struct GNUNET_CONTAINER_BloomFilter *bf;

  /**
   * Entry for this pending request in the expiration heap, or NULL.
   */
  struct GNUNET_CONTAINER_HeapNode *hnode;

  /**
   * Datastore queue entry for this request (or NULL for none).
   */
  struct GNUNET_DATASTORE_QueueEntry *qe;

  /**
   * DHT request handle for this request (or NULL for none).
   */
  struct GNUNET_DHT_GetHandle *gh;

  /**
   * Function to call upon completion of the local get
   * request, or NULL for none.
   */
  GSF_LocalLookupContinuation llc_cont;

  /**
   * Closure for llc_cont.
   */
  void *llc_cont_cls;

  /**
   * Last result from the local datastore lookup evaluation.
   */
  enum GNUNET_BLOCK_EvaluationResult local_result;

  /**
   * Identity of the peer that we should use for the 'sender'
   * (recipient of the response) when forwarding (0 for none).
   */
  GNUNET_PEER_Id sender_pid;

  /**
   * Identity of the peer that we should never forward this query
   * to since it originated this query (0 for none).
   */
  GNUNET_PEER_Id origin_pid;

  /**
   * Time we started the last datastore lookup.
   */
  struct GNUNET_TIME_Absolute qe_start;

  /**
   * Task that warns us if the local datastore lookup takes too long.
   */
  GNUNET_SCHEDULER_TaskIdentifier warn_task;

  /**
   * Current offset for querying our local datastore for results.
   * Starts at a random value, incremented until we get the same
   * UID again (detected using 'first_uid'), which is then used
   * to termiante the iteration.
   */
  uint64_t local_result_offset;

  /**
   * Unique ID of the first result from the local datastore;
   * used to detect wrap-around of the offset.
   */
  uint64_t first_uid;

  /**
   * Number of valid entries in the 'replies_seen' array.
   */
  unsigned int replies_seen_count;

  /**
   * Length of the 'replies_seen' array.
   */
  unsigned int replies_seen_size;

  /**
   * Mingle value we currently use for the bf.
   */
  uint32_t mingle;

  /**
   * Do we have a first UID yet?
   */
  unsigned int have_first_uid;

};


/**
 * All pending requests, ordered by the query.  Entries
 * are of type 'struct GSF_PendingRequest*'.
 */
static struct GNUNET_CONTAINER_MultiHashMap *pr_map;


/**
 * Datastore 'PUT' load tracking.
 */
static struct GNUNET_LOAD_Value *datastore_put_load;


/**
 * Are we allowed to migrate content to this peer.
 */
static int active_to_migration;


/**
 * Size of the datastore queue we assume for common requests.
 * Determined based on the network quota.
 */
static unsigned int datastore_queue_size;

/**
 * Heap with the request that will expire next at the top.  Contains
 * pointers of type "struct PendingRequest*"; these will *also* be
 * aliased from the "requests_by_peer" data structures and the
 * "requests_by_query" table.  Note that requests from our clients
 * don't expire and are thus NOT in the "requests_by_expiration"
 * (or the "requests_by_peer" tables).
 */
static struct GNUNET_CONTAINER_Heap *requests_by_expiration_heap;


/**
 * Maximum number of requests (from other peers, overall) that we're
 * willing to have pending at any given point in time.  Can be changed
 * via the configuration file (32k is just the default).
 */
static unsigned long long max_pending_requests = (32 * 1024);



/**
 * Recalculate our bloom filter for filtering replies.  This function
 * will create a new bloom filter from scratch, so it should only be
 * called if we have no bloomfilter at all (and hence can create a
 * fresh one of minimal size without problems) OR if our peer is the
 * initiator (in which case we may resize to larger than mimimum size).
 *
 * @param pr request for which the BF is to be recomputed
 */
static void
refresh_bloomfilter (struct GSF_PendingRequest *pr)
{
  if (pr->bf != NULL)
    GNUNET_CONTAINER_bloomfilter_free (pr->bf);
  pr->mingle =
      GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
  pr->bf =
      GNUNET_BLOCK_construct_bloomfilter (pr->mingle, pr->replies_seen,
                                          pr->replies_seen_count);
}


/**
 * Create a new pending request.
 *
 * @param options request options
 * @param type type of the block that is being requested
 * @param query key for the lookup
 * @param namespace namespace to lookup, NULL for no namespace
 * @param target preferred target for the request, NULL for none
 * @param bf_data raw data for bloom filter for known replies, can be NULL
 * @param bf_size number of bytes in bf_data
 * @param mingle mingle value for bf
 * @param anonymity_level desired anonymity level
 * @param priority maximum outgoing cummulative request priority to use
 * @param ttl current time-to-live for the request
 * @param sender_pid peer ID to use for the sender when forwarding, 0 for none
 * @param origin_pid peer ID of origin of query (do not loop back)
 * @param replies_seen hash codes of known local replies
 * @param replies_seen_count size of the 'replies_seen' array
 * @param rh handle to call when we get a reply
 * @param rh_cls closure for rh
 * @return handle for the new pending request
 */
struct GSF_PendingRequest *
GSF_pending_request_create_ (enum GSF_PendingRequestOptions options,
                             enum GNUNET_BLOCK_Type type,
                             const GNUNET_HashCode * query,
                             const GNUNET_HashCode * namespace,
                             const struct GNUNET_PeerIdentity *target,
                             const char *bf_data, size_t bf_size,
                             uint32_t mingle, uint32_t anonymity_level,
                             uint32_t priority, int32_t ttl,
                             GNUNET_PEER_Id sender_pid,
                             GNUNET_PEER_Id origin_pid,
                             const GNUNET_HashCode * replies_seen,
                             unsigned int replies_seen_count,
                             GSF_PendingRequestReplyHandler rh, void *rh_cls)
{
  struct GSF_PendingRequest *pr;
  struct GSF_PendingRequest *dpr;

#if DEBUG_FS
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Creating request handle for `%s' of type %d\n",
              GNUNET_h2s (query), type);
#endif
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Pending requests created"), 1,
                            GNUNET_NO);
  pr = GNUNET_malloc (sizeof (struct GSF_PendingRequest));
  pr->local_result_offset =
      GNUNET_CRYPTO_random_u64 (GNUNET_CRYPTO_QUALITY_WEAK, UINT64_MAX);
  pr->public_data.query = *query;
  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == type)
  {
    GNUNET_assert (NULL != namespace);
    pr->public_data.namespace = *namespace;
  }
  if (NULL != target)
  {
    pr->public_data.target = *target;
    pr->public_data.has_target = GNUNET_YES;
  }
  pr->public_data.anonymity_level = anonymity_level;
  pr->public_data.priority = priority;
  pr->public_data.original_priority = priority;
  pr->public_data.options = options;
  pr->public_data.type = type;
  pr->public_data.start_time = GNUNET_TIME_absolute_get ();
  pr->sender_pid = sender_pid;
  pr->origin_pid = origin_pid;
  pr->rh = rh;
  pr->rh_cls = rh_cls;
  GNUNET_assert ((sender_pid != 0) || (0 == (options & GSF_PRO_FORWARD_ONLY)));
  if (ttl >= 0)
    pr->public_data.ttl =
        GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply
                                          (GNUNET_TIME_UNIT_SECONDS,
                                           (uint32_t) ttl));
  else
    pr->public_data.ttl =
        GNUNET_TIME_absolute_subtract (pr->public_data.start_time,
                                       GNUNET_TIME_relative_multiply
                                       (GNUNET_TIME_UNIT_SECONDS,
                                        (uint32_t) (-ttl)));
  if (replies_seen_count > 0)
  {
    pr->replies_seen_size = replies_seen_count;
    pr->replies_seen =
        GNUNET_malloc (sizeof (GNUNET_HashCode) * pr->replies_seen_size);
    memcpy (pr->replies_seen, replies_seen,
            replies_seen_count * sizeof (GNUNET_HashCode));
    pr->replies_seen_count = replies_seen_count;
  }
  if (NULL != bf_data)
  {
    pr->bf =
        GNUNET_CONTAINER_bloomfilter_init (bf_data, bf_size,
                                           GNUNET_CONSTANTS_BLOOMFILTER_K);
    pr->mingle = mingle;
  }
  else if ((replies_seen_count > 0) &&
           (0 != (options & GSF_PRO_BLOOMFILTER_FULL_REFRESH)))
  {
    refresh_bloomfilter (pr);
  }
  GNUNET_CONTAINER_multihashmap_put (pr_map, query, pr,
                                     GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
  if (0 != (options & GSF_PRO_REQUEST_EXPIRES))
  {
    pr->hnode =
        GNUNET_CONTAINER_heap_insert (requests_by_expiration_heap, pr,
                                      pr->public_data.ttl.abs_value);
    /* make sure we don't track too many requests */
    while (GNUNET_CONTAINER_heap_get_size (requests_by_expiration_heap) >
           max_pending_requests)
    {
      dpr = GNUNET_CONTAINER_heap_peek (requests_by_expiration_heap);
      GNUNET_assert (dpr != NULL);
      if (pr == dpr)
        break;                  /* let the request live briefly... */
      dpr->rh (dpr->rh_cls, GNUNET_BLOCK_EVALUATION_REQUEST_VALID, dpr,
               UINT32_MAX, GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_BLOCK_TYPE_ANY,
               NULL, 0);
      GSF_pending_request_cancel_ (dpr, GNUNET_YES);
    }
  }
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Pending requests active"), 1,
                            GNUNET_NO);
  return pr;
}


/**
 * Obtain the public data associated with a pending request
 *
 * @param pr pending request
 * @return associated public data
 */
struct GSF_PendingRequestData *
GSF_pending_request_get_data_ (struct GSF_PendingRequest *pr)
{
  return &pr->public_data;
}


/**
 * Test if two pending requests are compatible (would generate
 * the same query modulo filters and should thus be processed
 * jointly).
 *
 * @param pra a pending request
 * @param prb another pending request
 * @return GNUNET_OK if the requests are compatible
 */
int
GSF_pending_request_is_compatible_ (struct GSF_PendingRequest *pra,
                                    struct GSF_PendingRequest *prb)
{
  if ((pra->public_data.type != prb->public_data.type) ||
      (0 !=
       memcmp (&pra->public_data.query, &prb->public_data.query,
               sizeof (GNUNET_HashCode))) ||
      ((pra->public_data.type == GNUNET_BLOCK_TYPE_FS_SBLOCK) &&
       (0 !=
        memcmp (&pra->public_data.namespace, &prb->public_data.namespace,
                sizeof (GNUNET_HashCode)))))
    return GNUNET_NO;
  return GNUNET_OK;
}



/**
 * Update a given pending request with additional replies
 * that have been seen.
 *
 * @param pr request to update
 * @param replies_seen hash codes of replies that we've seen
 * @param replies_seen_count size of the replies_seen array
 */
void
GSF_pending_request_update_ (struct GSF_PendingRequest *pr,
                             const GNUNET_HashCode * replies_seen,
                             unsigned int replies_seen_count)
{
  unsigned int i;
  GNUNET_HashCode mhash;

  if (replies_seen_count + pr->replies_seen_count < pr->replies_seen_count)
    return;                     /* integer overflow */
  if (0 != (pr->public_data.options & GSF_PRO_BLOOMFILTER_FULL_REFRESH))
  {
    /* we're responsible for the BF, full refresh */
    if (replies_seen_count + pr->replies_seen_count > pr->replies_seen_size)
      GNUNET_array_grow (pr->replies_seen, pr->replies_seen_size,
                         replies_seen_count + pr->replies_seen_count);
    memcpy (&pr->replies_seen[pr->replies_seen_count], replies_seen,
            sizeof (GNUNET_HashCode) * replies_seen_count);
    pr->replies_seen_count += replies_seen_count;
    refresh_bloomfilter (pr);
  }
  else
  {
    if (NULL == pr->bf)
    {
      /* we're not the initiator, but the initiator did not give us
       * any bloom-filter, so we need to create one on-the-fly */
      pr->mingle =
          GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, UINT32_MAX);
      pr->bf =
          GNUNET_BLOCK_construct_bloomfilter (pr->mingle, replies_seen,
                                              replies_seen_count);
    }
    else
    {
      for (i = 0; i < pr->replies_seen_count; i++)
      {
        GNUNET_BLOCK_mingle_hash (&replies_seen[i], pr->mingle, &mhash);
        GNUNET_CONTAINER_bloomfilter_add (pr->bf, &mhash);
      }
    }
  }
}


/**
 * Generate the message corresponding to the given pending request for
 * transmission to other peers (or at least determine its size).
 *
 * @param pr request to generate the message for
 * @param buf_size number of bytes available in buf
 * @param buf where to copy the message (can be NULL)
 * @return number of bytes needed (if > buf_size) or used
 */
size_t
GSF_pending_request_get_message_ (struct GSF_PendingRequest *pr,
                                  size_t buf_size, void *buf)
{
  char lbuf[GNUNET_SERVER_MAX_MESSAGE_SIZE];
  struct GetMessage *gm;
  GNUNET_HashCode *ext;
  size_t msize;
  unsigned int k;
  uint32_t bm;
  uint32_t prio;
  size_t bf_size;
  struct GNUNET_TIME_Absolute now;
  int64_t ttl;
  int do_route;

#if DEBUG_FS
  if (buf_size > 0)
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Building request message for `%s' of type %d\n",
                GNUNET_h2s (&pr->public_data.query), pr->public_data.type);
#endif
  k = 0;
  bm = 0;
  do_route = (0 == (pr->public_data.options & GSF_PRO_FORWARD_ONLY));
  if ((!do_route) && (pr->sender_pid == 0))
  {
    GNUNET_break (0);
    do_route = GNUNET_YES;
  }
  if (!do_route)
  {
    bm |= GET_MESSAGE_BIT_RETURN_TO;
    k++;
  }
  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
  {
    bm |= GET_MESSAGE_BIT_SKS_NAMESPACE;
    k++;
  }
  if (GNUNET_YES == pr->public_data.has_target)
  {
    bm |= GET_MESSAGE_BIT_TRANSMIT_TO;
    k++;
  }
  bf_size = GNUNET_CONTAINER_bloomfilter_get_size (pr->bf);
  msize = sizeof (struct GetMessage) + bf_size + k * sizeof (GNUNET_HashCode);
  GNUNET_assert (msize < GNUNET_SERVER_MAX_MESSAGE_SIZE);
  if (buf_size < msize)
    return msize;
  gm = (struct GetMessage *) lbuf;
  gm->header.type = htons (GNUNET_MESSAGE_TYPE_FS_GET);
  gm->header.size = htons (msize);
  gm->type = htonl (pr->public_data.type);
  if (do_route)
    prio =
        GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
                                  pr->public_data.priority + 1);
  else
    prio = 0;
  pr->public_data.priority -= prio;
  gm->priority = htonl (prio);
  now = GNUNET_TIME_absolute_get ();
  ttl = (int64_t) (pr->public_data.ttl.abs_value - now.abs_value);
  gm->ttl = htonl (ttl / 1000);
  gm->filter_mutator = htonl (pr->mingle);
  gm->hash_bitmap = htonl (bm);
  gm->query = pr->public_data.query;
  ext = (GNUNET_HashCode *) & gm[1];
  k = 0;
  if (!do_route)
    GNUNET_PEER_resolve (pr->sender_pid,
                         (struct GNUNET_PeerIdentity *) &ext[k++]);
  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
    memcpy (&ext[k++], &pr->public_data.namespace, sizeof (GNUNET_HashCode));
  if (GNUNET_YES == pr->public_data.has_target)
    ext[k++] = pr->public_data.target.hashPubKey;
  if (pr->bf != NULL)
    GNUNET_assert (GNUNET_SYSERR !=
                   GNUNET_CONTAINER_bloomfilter_get_raw_data (pr->bf,
                                                              (char *) &ext[k],
                                                              bf_size));
  memcpy (buf, gm, msize);
  return msize;
}


/**
 * Iterator to free pending requests.
 *
 * @param cls closure, unused
 * @param key current key code
 * @param value value in the hash map (pending request)
 * @return GNUNET_YES (we should continue to iterate)
 */
static int
clean_request (void *cls, const GNUNET_HashCode * key, void *value)
{
  struct GSF_PendingRequest *pr = value;
  GSF_LocalLookupContinuation cont;

#if DEBUG_FS
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Cleaning up pending request for `%s'.\n", GNUNET_h2s (key));
#endif
  if (NULL != (cont = pr->llc_cont))
  {
    pr->llc_cont = NULL;
    cont (pr->llc_cont_cls, pr, pr->local_result);
  }
  GSF_plan_notify_request_done_ (pr);
  GNUNET_free_non_null (pr->replies_seen);
  if (NULL != pr->bf)
  {
    GNUNET_CONTAINER_bloomfilter_free (pr->bf);
    pr->bf = NULL;
  }
  GNUNET_PEER_change_rc (pr->sender_pid, -1);
  pr->sender_pid = 0;
  GNUNET_PEER_change_rc (pr->origin_pid, -1);
  pr->origin_pid = 0;
  if (NULL != pr->hnode)
  {
    GNUNET_CONTAINER_heap_remove_node (pr->hnode);
    pr->hnode = NULL;
  }
  if (NULL != pr->qe)
  {
    GNUNET_DATASTORE_cancel (pr->qe);
    pr->qe = NULL;
  }
  if (NULL != pr->gh)
  {
    GNUNET_DHT_get_stop (pr->gh);
    pr->gh = NULL;
  }
  if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
  {
    GNUNET_SCHEDULER_cancel (pr->warn_task);
    pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
  }
  GNUNET_assert (GNUNET_OK ==
                 GNUNET_CONTAINER_multihashmap_remove (pr_map,
                                                       &pr->public_data.query,
                                                       pr));
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Pending requests active"), -1,
                            GNUNET_NO);
  GNUNET_free (pr);
  return GNUNET_YES;
}


/**
 * Explicitly cancel a pending request.
 *
 * @param pr request to cancel
 * @param full_cleanup fully purge the request
 */
void
GSF_pending_request_cancel_ (struct GSF_PendingRequest *pr, int full_cleanup)
{
  GSF_LocalLookupContinuation cont;

  if (NULL == pr_map)
    return;                     /* already cleaned up! */
  if (GNUNET_YES != full_cleanup)
  {
    /* make request inactive (we're no longer interested in more results),
     * but do NOT remove from our data-structures, we still need it there
     * to prevent the request from looping */
    pr->rh = NULL;
    if (NULL != (cont = pr->llc_cont))
    {
      pr->llc_cont = NULL;
      cont (pr->llc_cont_cls, pr, pr->local_result);
    }
    GSF_plan_notify_request_done_ (pr);
    if (NULL != pr->qe)
    {
      GNUNET_DATASTORE_cancel (pr->qe);
      pr->qe = NULL;
    }
    if (NULL != pr->gh)
    {
      GNUNET_DHT_get_stop (pr->gh);
      pr->gh = NULL;
    }
    if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
    {
      GNUNET_SCHEDULER_cancel (pr->warn_task);
      pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
    }
    return;
  }
  GNUNET_assert (GNUNET_YES ==
                 clean_request (NULL, &pr->public_data.query, pr));
}


/**
 * Iterate over all pending requests.
 *
 * @param it function to call for each request
 * @param cls closure for it
 */
void
GSF_iterate_pending_requests_ (GSF_PendingRequestIterator it, void *cls)
{
  GNUNET_CONTAINER_multihashmap_iterate (pr_map,
                                         (GNUNET_CONTAINER_HashMapIterator) it,
                                         cls);
}




/**
 * Closure for "process_reply" function.
 */
struct ProcessReplyClosure
{
  /**
   * The data for the reply.
   */
  const void *data;

  /**
   * Who gave us this reply? NULL for local host (or DHT)
   */
  struct GSF_ConnectedPeer *sender;

  /**
   * When the reply expires.
   */
  struct GNUNET_TIME_Absolute expiration;

  /**
   * Size of data.
   */
  size_t size;

  /**
   * Type of the block.
   */
  enum GNUNET_BLOCK_Type type;

  /**
   * How much was this reply worth to us?
   */
  uint32_t priority;

  /**
   * Anonymity requirements for this reply.
   */
  uint32_t anonymity_level;

  /**
   * Evaluation result (returned).
   */
  enum GNUNET_BLOCK_EvaluationResult eval;

  /**
   * Did we find a matching request?
   */
  int request_found;
};


/**
 * Update the performance data for the sender (if any) since
 * the sender successfully answered one of our queries.
 *
 * @param prq information about the sender
 * @param pr request that was satisfied
 */
static void
update_request_performance_data (struct ProcessReplyClosure *prq,
                                 struct GSF_PendingRequest *pr)
{
  if (prq->sender == NULL)
    return;
  GSF_peer_update_performance_ (prq->sender, pr->public_data.start_time,
                                prq->priority);
}


/**
 * We have received a reply; handle it!
 *
 * @param cls response (struct ProcessReplyClosure)
 * @param key our query
 * @param value value in the hash map (info about the query)
 * @return GNUNET_YES (we should continue to iterate)
 */
static int
process_reply (void *cls, const GNUNET_HashCode * key, void *value)
{
  struct ProcessReplyClosure *prq = cls;
  struct GSF_PendingRequest *pr = value;
  GNUNET_HashCode chash;

  if (NULL == pr->rh)
    return GNUNET_YES;
#if DEBUG_FS
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Matched result (type %u) for query `%s' with pending request\n",
              (unsigned int) prq->type, GNUNET_h2s (key));
#endif
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# replies received and matched"), 1,
                            GNUNET_NO);
  prq->eval =
      GNUNET_BLOCK_evaluate (GSF_block_ctx, prq->type, key, &pr->bf, pr->mingle,
                             &pr->public_data.namespace,
                             (prq->type ==
                              GNUNET_BLOCK_TYPE_FS_SBLOCK) ?
                             sizeof (GNUNET_HashCode) : 0, prq->data,
                             prq->size);
  switch (prq->eval)
  {
  case GNUNET_BLOCK_EVALUATION_OK_MORE:
    update_request_performance_data (prq, pr);
    break;
  case GNUNET_BLOCK_EVALUATION_OK_LAST:
    /* short cut: stop processing early, no BF-update, etc. */
    update_request_performance_data (prq, pr);
    GNUNET_LOAD_update (GSF_rt_entry_lifetime,
                        GNUNET_TIME_absolute_get_duration (pr->
                                                           public_data.start_time).rel_value);
    /* pass on to other peers / local clients */
    pr->rh (pr->rh_cls, prq->eval, pr, prq->anonymity_level, prq->expiration,
            prq->type, prq->data, prq->size);
    return GNUNET_YES;
  case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop
                              ("# duplicate replies discarded (bloomfilter)"),
                              1, GNUNET_NO);
#if DEBUG_FS && 0
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Duplicate response `%s', discarding.\n", GNUNET_h2s (&mhash));
#endif
    return GNUNET_YES;          /* duplicate */
  case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
    return GNUNET_YES;          /* wrong namespace */
  case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
    GNUNET_break (0);
    return GNUNET_YES;
  case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
    GNUNET_break (0);
    return GNUNET_YES;
  case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Unsupported block type %u\n"),
                prq->type);
    return GNUNET_NO;
  }
  /* update bloomfilter */
  GNUNET_CRYPTO_hash (prq->data, prq->size, &chash);
  GSF_pending_request_update_ (pr, &chash, 1);
  if (NULL == prq->sender)
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Found result for query `%s' in local datastore\n",
                GNUNET_h2s (key));
#endif
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop ("# results found locally"), 1,
                              GNUNET_NO);
  }
  else
  {
    GSF_dht_lookup_ (pr);
  }
  prq->priority += pr->public_data.original_priority;
  pr->public_data.priority = 0;
  pr->public_data.original_priority = 0;
  pr->public_data.results_found++;
  prq->request_found = GNUNET_YES;
  /* finally, pass on to other peer / local client */
  pr->rh (pr->rh_cls, prq->eval, pr, prq->anonymity_level, prq->expiration,
          prq->type, prq->data, prq->size);
  return GNUNET_YES;
}


/**
 * Context for the 'put_migration_continuation'.
 */
struct PutMigrationContext
{

  /**
   * Start time for the operation.
   */
  struct GNUNET_TIME_Absolute start;

  /**
   * Request origin.
   */
  struct GNUNET_PeerIdentity origin;

  /**
   * GNUNET_YES if we had a matching request for this block,
   * GNUNET_NO if not.
   */
  int requested;
};


/**
 * Continuation called to notify client about result of the
 * operation.
 *
 * @param cls closure
 * @param success GNUNET_SYSERR on failure
 * @param msg NULL on success, otherwise an error message
 */
static void
put_migration_continuation (void *cls, int success, const char *msg)
{
  struct PutMigrationContext *pmc = cls;
  struct GNUNET_TIME_Relative delay;
  struct GNUNET_TIME_Relative block_time;
  struct GSF_ConnectedPeer *cp;
  struct GSF_PeerPerformanceData *ppd;

  delay = GNUNET_TIME_absolute_get_duration (pmc->start);
  cp = GSF_peer_get_ (&pmc->origin);
  if ((GNUNET_OK != success) && (GNUNET_NO == pmc->requested))
  {
    /* block migration for a bit... */
    if (NULL != cp)
    {
      ppd = GSF_get_peer_performance_data_ (cp);
      ppd->migration_duplication++;
      block_time =
          GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
                                         5 * ppd->migration_duplication +
                                         GNUNET_CRYPTO_random_u32
                                         (GNUNET_CRYPTO_QUALITY_WEAK, 5));
      GSF_block_peer_migration_ (cp, block_time);
    }
  }
  else
  {
    if (NULL != cp)
    {
      ppd = GSF_get_peer_performance_data_ (cp);
      ppd->migration_duplication = 0;   /* reset counter */
    }
  }
  GNUNET_free (pmc);
  /* FIXME: should we really update the load value on failure? */
  if (NULL != datastore_put_load)
    GNUNET_LOAD_update (datastore_put_load, delay.rel_value);
  if (GNUNET_OK == success)
    return;
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Datastore `PUT' failures"), 1,
                            GNUNET_NO);
}


/**
 * Test if the DATABASE (PUT) load on this peer is too high
 * to even consider processing the query at
 * all.
 *
 * @return GNUNET_YES if the load is too high to do anything (load high)
 *         GNUNET_NO to process normally (load normal or low)
 */
static int
test_put_load_too_high (uint32_t priority)
{
  double ld;

  if (NULL == datastore_put_load)
    return GNUNET_NO;
  if (GNUNET_LOAD_get_average (datastore_put_load) < 50)
    return GNUNET_NO;           /* very fast */
  ld = GNUNET_LOAD_get_load (datastore_put_load);
  if (ld < 2.0 * (1 + priority))
    return GNUNET_NO;
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop
                            ("# storage requests dropped due to high load"), 1,
                            GNUNET_NO);
  return GNUNET_YES;
}


/**
 * Iterator called on each result obtained for a DHT
 * operation that expects a reply
 *
 * @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
 */
static void
handle_dht_reply (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)
{
  struct GSF_PendingRequest *pr = cls;
  struct ProcessReplyClosure prq;
  struct PutMigrationContext *pmc;

  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Replies received from DHT"), 1,
                            GNUNET_NO);
  memset (&prq, 0, sizeof (prq));
  prq.data = data;
  prq.expiration = exp;
  prq.size = size;
  prq.type = type;
  process_reply (&prq, key, pr);
  if ((GNUNET_YES == active_to_migration) &&
      (GNUNET_NO == test_put_load_too_high (prq.priority)))
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Replicating result for query `%s' with priority %u\n",
                GNUNET_h2s (key), prq.priority);
#endif
    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
    pmc->start = GNUNET_TIME_absolute_get ();
    pmc->requested = GNUNET_YES;
    if (NULL ==
        GNUNET_DATASTORE_put (GSF_dsh, 0, key, size, data, type, prq.priority,
                              1 /* anonymity */ ,
                              0 /* replication */ ,
                              exp, 1 + prq.priority, MAX_DATASTORE_QUEUE,
                              GNUNET_CONSTANTS_SERVICE_TIMEOUT,
                              &put_migration_continuation, pmc))
    {
      put_migration_continuation (pmc, GNUNET_NO, NULL);
    }
  }
}


/**
 * Consider looking up the data in the DHT (anonymity-level permitting).
 *
 * @param pr the pending request to process
 */
void
GSF_dht_lookup_ (struct GSF_PendingRequest *pr)
{
  const void *xquery;
  size_t xquery_size;
  struct GNUNET_PeerIdentity pi;
  char buf[sizeof (GNUNET_HashCode) * 2];

  if (0 != pr->public_data.anonymity_level)
    return;
  if (NULL != pr->gh)
  {
    GNUNET_DHT_get_stop (pr->gh);
    pr->gh = NULL;
  }
  xquery = NULL;
  xquery_size = 0;
  if (GNUNET_BLOCK_TYPE_FS_SBLOCK == pr->public_data.type)
  {
    xquery = buf;
    memcpy (buf, &pr->public_data.namespace, sizeof (GNUNET_HashCode));
    xquery_size = sizeof (GNUNET_HashCode);
  }
  if (0 != (pr->public_data.options & GSF_PRO_FORWARD_ONLY))
  {
    GNUNET_assert (0 != pr->sender_pid);
    GNUNET_PEER_resolve (pr->sender_pid, &pi);
    memcpy (&buf[xquery_size], &pi, sizeof (struct GNUNET_PeerIdentity));
    xquery_size += sizeof (struct GNUNET_PeerIdentity);
  }
  pr->gh =
      GNUNET_DHT_get_start (GSF_dht, GNUNET_TIME_UNIT_FOREVER_REL,
                            pr->public_data.type, &pr->public_data.query,
                            5 /* DEFAULT_GET_REPLICATION */ ,
                            GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
                            /* FIXME: can no longer pass pr->bf/pr->mingle... */
                            xquery, xquery_size, &handle_dht_reply, pr);
}


/**
 * Task that issues a warning if the datastore lookup takes too long.
 *
 * @param cls the 'struct GSF_PendingRequest'
 * @param tc task context
 */
static void
warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GSF_PendingRequest *pr = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              _("Datastore lookup already took %llu ms!\n"),
              (unsigned long long)
              GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
  pr->warn_task =
      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
                                    pr);
}


/**
 * Task that issues a warning if the datastore lookup takes too long.
 *
 * @param cls the 'struct GSF_PendingRequest'
 * @param tc task context
 */
static void
odc_warn_delay_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
  struct GSF_PendingRequest *pr = cls;

  GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
              _("On-demand lookup already took %llu ms!\n"),
              (unsigned long long)
              GNUNET_TIME_absolute_get_duration (pr->qe_start).rel_value);
  pr->warn_task =
      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
                                    &odc_warn_delay_task, pr);
}


/**
 * We're processing (local) results for a search request
 * from another peer.  Pass applicable results to the
 * peer and if we are done either clean up (operation
 * complete) or forward to other peers (more results possible).
 *
 * @param cls our closure (struct PendingRequest)
 * @param key key for the content
 * @param size number of bytes in data
 * @param data content stored
 * @param type type of the content
 * @param priority priority of the content
 * @param anonymity anonymity-level for the content
 * @param expiration expiration time for the content
 * @param uid unique identifier for the datum;
 *        maybe 0 if no unique identifier is available
 */
static void
process_local_reply (void *cls, const GNUNET_HashCode * key, size_t size,
                     const void *data, enum GNUNET_BLOCK_Type type,
                     uint32_t priority, uint32_t anonymity,
                     struct GNUNET_TIME_Absolute expiration, uint64_t uid)
{
  struct GSF_PendingRequest *pr = cls;
  GSF_LocalLookupContinuation cont;
  struct ProcessReplyClosure prq;
  GNUNET_HashCode query;
  unsigned int old_rf;

  GNUNET_SCHEDULER_cancel (pr->warn_task);
  pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
  if (NULL != pr->qe)
  {
    pr->qe = NULL;
    if (NULL == key)
    {
      GNUNET_STATISTICS_update (GSF_stats,
                                gettext_noop
                                ("# Datastore lookups concluded (no results)"),
                                1, GNUNET_NO);
    }
    if (GNUNET_NO == pr->have_first_uid)
    {
      pr->first_uid = uid;
      pr->have_first_uid = 1;
    }
    else
    {
      if ((uid == pr->first_uid) && (key != NULL))
      {
        GNUNET_STATISTICS_update (GSF_stats,
                                  gettext_noop
                                  ("# Datastore lookups concluded (seen all)"),
                                  1, GNUNET_NO);
        key = NULL;             /* all replies seen! */
      }
      pr->have_first_uid++;
      if ((pr->have_first_uid > MAX_RESULTS) && (key != NULL))
      {
        GNUNET_STATISTICS_update (GSF_stats,
                                  gettext_noop
                                  ("# Datastore lookups aborted (more than MAX_RESULTS)"),
                                  1, GNUNET_NO);
        key = NULL;             /* all replies seen! */
      }
    }
  }
  if (NULL == key)
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "No further local responses available.\n");
#endif
    if ((pr->public_data.type == GNUNET_BLOCK_TYPE_FS_DBLOCK) ||
        (pr->public_data.type == GNUNET_BLOCK_TYPE_FS_IBLOCK))
      GNUNET_STATISTICS_update (GSF_stats,
                                gettext_noop
                                ("# requested DBLOCK or IBLOCK not found"), 1,
                                GNUNET_NO);
    goto check_error_and_continue;
  }
#if DEBUG_FS
  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
              "Received reply for `%s' of type %d with UID %llu from datastore.\n",
              GNUNET_h2s (key), type, (unsigned long long) uid);
#endif
  if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Found ONDEMAND block, performing on-demand encoding\n");
#endif
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop
                              ("# on-demand blocks matched requests"), 1,
                              GNUNET_NO);
    pr->qe_start = GNUNET_TIME_absolute_get ();
    pr->warn_task =
        GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
                                      &odc_warn_delay_task, pr);
    if (GNUNET_OK ==
        GNUNET_FS_handle_on_demand_block (key, size, data, type, priority,
                                          anonymity, expiration, uid,
                                          &process_local_reply, pr))
    {
      GNUNET_STATISTICS_update (GSF_stats,
                                gettext_noop
                                ("# on-demand lookups performed successfully"),
                                1, GNUNET_NO);
      return;                   /* we're done */
    }
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop ("# on-demand lookups failed"), 1,
                              GNUNET_NO);
    GNUNET_SCHEDULER_cancel (pr->warn_task);
    pr->warn_task =
        GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
                                      &warn_delay_task, pr);
    pr->qe =
        GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset - 1,
                                  &pr->public_data.query,
                                  pr->public_data.type ==
                                  GNUNET_BLOCK_TYPE_FS_DBLOCK ?
                                  GNUNET_BLOCK_TYPE_ANY : pr->public_data.type,
                                  (0 !=
                                   (GSF_PRO_PRIORITY_UNLIMITED &
                                    pr->public_data.options)) ? UINT_MAX : 1
                                  /* queue priority */ ,
                                  (0 !=
                                   (GSF_PRO_PRIORITY_UNLIMITED &
                                    pr->public_data.options)) ? UINT_MAX :
                                  datastore_queue_size
                                  /* max queue size */ ,
                                  GNUNET_TIME_UNIT_FOREVER_REL,
                                  &process_local_reply, pr);
    if (NULL != pr->qe)
      return;                   /* we're done */
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop
                              ("# Datastore lookups concluded (error queueing)"),
                              1, GNUNET_NO);
    goto check_error_and_continue;
  }
  old_rf = pr->public_data.results_found;
  memset (&prq, 0, sizeof (prq));
  prq.data = data;
  prq.expiration = expiration;
  prq.size = size;
  if (GNUNET_OK !=
      GNUNET_BLOCK_get_key (GSF_block_ctx, type, data, size, &query))
  {
    GNUNET_break (0);
    GNUNET_DATASTORE_remove (GSF_dsh, key, size, data, -1, -1,
                             GNUNET_TIME_UNIT_FOREVER_REL, NULL, NULL);
    pr->qe_start = GNUNET_TIME_absolute_get ();
    pr->warn_task =
        GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
                                      &warn_delay_task, pr);
    pr->qe =
        GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset - 1,
                                  &pr->public_data.query,
                                  pr->public_data.type ==
                                  GNUNET_BLOCK_TYPE_FS_DBLOCK ?
                                  GNUNET_BLOCK_TYPE_ANY : pr->public_data.type,
                                  (0 !=
                                   (GSF_PRO_PRIORITY_UNLIMITED &
                                    pr->public_data.options)) ? UINT_MAX : 1
                                  /* queue priority */ ,
                                  (0 !=
                                   (GSF_PRO_PRIORITY_UNLIMITED &
                                    pr->public_data.options)) ? UINT_MAX :
                                  datastore_queue_size
                                  /* max queue size */ ,
                                  GNUNET_TIME_UNIT_FOREVER_REL,
                                  &process_local_reply, pr);
    if (pr->qe == NULL)
    {
      GNUNET_STATISTICS_update (GSF_stats,
                                gettext_noop
                                ("# Datastore lookups concluded (error queueing)"),
                                1, GNUNET_NO);
      goto check_error_and_continue;
    }
    return;
  }
  prq.type = type;
  prq.priority = priority;
  prq.request_found = GNUNET_NO;
  prq.anonymity_level = anonymity;
  if ((old_rf == 0) && (pr->public_data.results_found == 0))
    GSF_update_datastore_delay_ (pr->public_data.start_time);
  process_reply (&prq, key, pr);
  pr->local_result = prq.eval;
  if (prq.eval == GNUNET_BLOCK_EVALUATION_OK_LAST)
  {
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop
                              ("# Datastore lookups concluded (found last result)"),
                              1, GNUNET_NO);
    goto check_error_and_continue;
  }
  if ((0 == (GSF_PRO_PRIORITY_UNLIMITED & pr->public_data.options)) &&
      ((GNUNET_YES == GSF_test_get_load_too_high_ (0)) ||
       (pr->public_data.results_found > 5 + 2 * pr->public_data.priority)))
  {
#if DEBUG_FS > 2
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Load too high, done with request\n");
#endif
    GNUNET_STATISTICS_update (GSF_stats,
                              gettext_noop
                              ("# Datastore lookups concluded (load too high)"),
                              1, GNUNET_NO);
    goto check_error_and_continue;
  }
  pr->qe_start = GNUNET_TIME_absolute_get ();
  pr->warn_task =
      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
                                    pr);
  pr->qe =
      GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset++,
                                &pr->public_data.query,
                                pr->public_data.type ==
                                GNUNET_BLOCK_TYPE_FS_DBLOCK ?
                                GNUNET_BLOCK_TYPE_ANY : pr->public_data.type,
                                (0 !=
                                 (GSF_PRO_PRIORITY_UNLIMITED & pr->
                                  public_data.options)) ? UINT_MAX : 1
                                /* queue priority */ ,
                                (0 !=
                                 (GSF_PRO_PRIORITY_UNLIMITED & pr->
                                  public_data.options)) ? UINT_MAX :
                                datastore_queue_size
                                /* max queue size */ ,
                                GNUNET_TIME_UNIT_FOREVER_REL,
                                &process_local_reply, pr);
  /* check if we successfully queued another datastore request;
   * if so, return, otherwise call our continuation (if we have
   * any) */
check_error_and_continue:
  if (NULL != pr->qe)
    return;
  if (GNUNET_SCHEDULER_NO_TASK != pr->warn_task)
  {
    GNUNET_SCHEDULER_cancel (pr->warn_task);
    pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
  }
  if (NULL == (cont = pr->llc_cont))
    return;                     /* no continuation */
  pr->llc_cont = NULL;
  cont (pr->llc_cont_cls, pr, pr->local_result);
}


/**
 * Is the given target a legitimate peer for forwarding the given request?
 *
 * @param pr request
 * @param target
 * @return GNUNET_YES if this request could be forwarded to the given peer
 */
int
GSF_pending_request_test_target_ (struct GSF_PendingRequest *pr,
                                  const struct GNUNET_PeerIdentity *target)
{
  struct GNUNET_PeerIdentity pi;

  if (0 == pr->origin_pid)
    return GNUNET_YES;
  GNUNET_PEER_resolve (pr->origin_pid, &pi);
  return (0 ==
          memcmp (&pi, target,
                  sizeof (struct GNUNET_PeerIdentity))) ? GNUNET_NO :
      GNUNET_YES;
}


/**
 * Look up the request in the local datastore.
 *
 * @param pr the pending request to process
 * @param cont function to call at the end
 * @param cont_cls closure for cont
 */
void
GSF_local_lookup_ (struct GSF_PendingRequest *pr,
                   GSF_LocalLookupContinuation cont, void *cont_cls)
{
  GNUNET_assert (NULL == pr->gh);
  GNUNET_assert (NULL == pr->llc_cont);
  pr->llc_cont = cont;
  pr->llc_cont_cls = cont_cls;
  pr->qe_start = GNUNET_TIME_absolute_get ();
  pr->warn_task =
      GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES, &warn_delay_task,
                                    pr);
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# Datastore lookups initiated"), 1,
                            GNUNET_NO);
  pr->qe =
      GNUNET_DATASTORE_get_key (GSF_dsh, pr->local_result_offset++,
                                &pr->public_data.query,
                                pr->public_data.type ==
                                GNUNET_BLOCK_TYPE_FS_DBLOCK ?
                                GNUNET_BLOCK_TYPE_ANY : pr->public_data.type,
                                (0 !=
                                 (GSF_PRO_PRIORITY_UNLIMITED & pr->
                                  public_data.options)) ? UINT_MAX : 1
                                /* queue priority */ ,
                                (0 !=
                                 (GSF_PRO_PRIORITY_UNLIMITED & pr->
                                  public_data.options)) ? UINT_MAX :
                                datastore_queue_size
                                /* max queue size */ ,
                                GNUNET_TIME_UNIT_FOREVER_REL,
                                &process_local_reply, pr);
  if (NULL != pr->qe)
    return;
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop
                            ("# Datastore lookups concluded (error queueing)"),
                            1, GNUNET_NO);
  GNUNET_SCHEDULER_cancel (pr->warn_task);
  pr->warn_task = GNUNET_SCHEDULER_NO_TASK;
  pr->llc_cont = NULL;
  if (NULL != cont)
    cont (cont_cls, pr, pr->local_result);
}



/**
 * Handle P2P "CONTENT" message.  Checks that the message is
 * well-formed and then checks if there are any pending requests for
 * this content and possibly passes it on (to local clients or other
 * peers).  Does NOT perform migration (content caching at this peer).
 *
 * @param cp the other peer involved (sender or receiver, NULL
 *        for loopback messages where we are both sender and receiver)
 * @param message the actual message
 * @return GNUNET_OK if the message was well-formed,
 *         GNUNET_SYSERR if the message was malformed (close connection,
 *         do not cache under any circumstances)
 */
int
GSF_handle_p2p_content_ (struct GSF_ConnectedPeer *cp,
                         const struct GNUNET_MessageHeader *message)
{
  const struct PutMessage *put;
  uint16_t msize;
  size_t dsize;
  enum GNUNET_BLOCK_Type type;
  struct GNUNET_TIME_Absolute expiration;
  GNUNET_HashCode query;
  struct ProcessReplyClosure prq;
  struct GNUNET_TIME_Relative block_time;
  double putl;
  struct PutMigrationContext *pmc;

  msize = ntohs (message->size);
  if (msize < sizeof (struct PutMessage))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  put = (const struct PutMessage *) message;
  dsize = msize - sizeof (struct PutMessage);
  type = ntohl (put->type);
  expiration = GNUNET_TIME_absolute_ntoh (put->expiration);
  if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
    return GNUNET_SYSERR;
  if (GNUNET_OK !=
      GNUNET_BLOCK_get_key (GSF_block_ctx, type, &put[1], dsize, &query))
  {
    GNUNET_break_op (0);
    return GNUNET_SYSERR;
  }
  GNUNET_STATISTICS_update (GSF_stats,
                            gettext_noop ("# GAP PUT messages received"), 1,
                            GNUNET_NO);
  /* now, lookup 'query' */
  prq.data = (const void *) &put[1];
  if (NULL != cp)
    prq.sender = cp;
  else
    prq.sender = NULL;
  prq.size = dsize;
  prq.type = type;
  prq.expiration = expiration;
  prq.priority = 0;
  prq.anonymity_level = UINT32_MAX;
  prq.request_found = GNUNET_NO;
  GNUNET_CONTAINER_multihashmap_get_multiple (pr_map, &query, &process_reply,
                                              &prq);
  if (NULL != cp)
  {
    GSF_connected_peer_change_preference_ (cp,
                                           CONTENT_BANDWIDTH_VALUE +
                                           1000 * prq.priority);
    GSF_get_peer_performance_data_ (cp)->trust += prq.priority;
  }
  if ((GNUNET_YES == active_to_migration) &&
      (GNUNET_NO == test_put_load_too_high (prq.priority)))
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Replicating result for query `%s' with priority %u\n",
                GNUNET_h2s (&query), prq.priority);
#endif
    pmc = GNUNET_malloc (sizeof (struct PutMigrationContext));
    pmc->start = GNUNET_TIME_absolute_get ();
    pmc->requested = prq.request_found;
    GNUNET_assert (0 != GSF_get_peer_performance_data_ (cp)->pid);
    GNUNET_PEER_resolve (GSF_get_peer_performance_data_ (cp)->pid,
                         &pmc->origin);
    if (NULL ==
        GNUNET_DATASTORE_put (GSF_dsh, 0, &query, dsize, &put[1], type,
                              prq.priority, 1 /* anonymity */ ,
                              0 /* replication */ ,
                              expiration, 1 + prq.priority, MAX_DATASTORE_QUEUE,
                              GNUNET_CONSTANTS_SERVICE_TIMEOUT,
                              &put_migration_continuation, pmc))
    {
      put_migration_continuation (pmc, GNUNET_NO, NULL);
    }
  }
  else
  {
#if DEBUG_FS
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
                "Choosing not to keep content `%s' (%d/%d)\n",
                GNUNET_h2s (&query), active_to_migration,
                test_put_load_too_high (prq.priority));
#endif
  }
  putl = GNUNET_LOAD_get_load (datastore_put_load);
  if ((NULL != (cp = prq.sender)) && (GNUNET_NO == prq.request_found) &&
      ((GNUNET_YES != active_to_migration) ||
       (putl > 2.5 * (1 + prq.priority))))
  {
    if (GNUNET_YES != active_to_migration)
      putl = 1.0 + GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 5);
    block_time =
        GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
                                       5000 +
                                       GNUNET_CRYPTO_random_u32
                                       (GNUNET_CRYPTO_QUALITY_WEAK,
                                        (unsigned int) (60000 * putl * putl)));
    GSF_block_peer_migration_ (cp, block_time);
  }
  return GNUNET_OK;
}


/**
 * Setup the subsystem.
 */
void
GSF_pending_request_init_ ()
{
  unsigned long long bps;

  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_number (GSF_cfg, "fs",
                                             "MAX_PENDING_REQUESTS",
                                             &max_pending_requests))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                _
                ("Configuration fails to specify `%s', assuming default value."),
                "MAX_PENDING_REQUESTS");
  }
  if (GNUNET_OK !=
      GNUNET_CONFIGURATION_get_value_size (GSF_cfg, "ats", "WAN_QUOTA_OUT",
                                           &bps))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_INFO,
                _
                ("Configuration fails to specify `%s', assuming default value."),
                "WAN_QUOTA_OUT");
    bps = 65536;
  }
  /* queue size should be #queries we can have pending and satisfy within
   * a carry interval: */
  datastore_queue_size =
      bps * GNUNET_CONSTANTS_MAX_BANDWIDTH_CARRY_S / DBLOCK_SIZE;

  active_to_migration =
      GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg, "FS", "CONTENT_CACHING");
  datastore_put_load = GNUNET_LOAD_value_init (DATASTORE_LOAD_AUTODECLINE);
  pr_map = GNUNET_CONTAINER_multihashmap_create (32 * 1024);
  requests_by_expiration_heap =
      GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
}


/**
 * Shutdown the subsystem.
 */
void
GSF_pending_request_done_ ()
{
  GNUNET_CONTAINER_multihashmap_iterate (pr_map, &clean_request, NULL);
  GNUNET_CONTAINER_multihashmap_destroy (pr_map);
  pr_map = NULL;
  GNUNET_CONTAINER_heap_destroy (requests_by_expiration_heap);
  requests_by_expiration_heap = NULL;
  GNUNET_LOAD_value_free (datastore_put_load);
  datastore_put_load = NULL;
}


/* end of gnunet-service-fs_pr.c */