/*
This file is part of GNUnet.
- (C) 2011 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2011, 2016 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 3, 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.
+ Affero 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.
-*/
+ You should have received a copy of the GNU Affero General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ SPDX-License-Identifier: AGPL3.0-or-later
+ */
/**
* @file fs/gnunet-service-fs_push.c
* @author Christian Grothoff
*/
#include "platform.h"
+#include "gnunet-service-fs.h"
+#include "gnunet-service-fs_cp.h"
+#include "gnunet-service-fs_indexing.h"
#include "gnunet-service-fs_push.h"
-/* FIXME: below are only old code fragments to use... */
+/**
+ * Maximum number of blocks we keep in memory for migration.
+ */
+#define MAX_MIGRATION_QUEUE 8
+
+/**
+ * Blocks are at most migrated to this number of peers
+ * plus one, each time they are fetched from the database.
+ */
+#define MIGRATION_LIST_SIZE 2
+
+/**
+ * How long must content remain valid for us to consider it for migration?
+ * If content will expire too soon, there is clearly no point in pushing
+ * it to other peers. This value gives the threshold for migration. Note
+ * that if this value is increased, the migration testcase may need to be
+ * adjusted as well (especially the CONTENT_LIFETIME in fs_test_lib.c).
+ */
+#define MIN_MIGRATION_CONTENT_LIFETIME GNUNET_TIME_relative_multiply ( \
+ GNUNET_TIME_UNIT_MINUTES, 30)
+
/**
* Block that is ready for migration to other peers. Actual data is at the end of the block.
*/
struct MigrationReadyBlock
{
-
/**
* This is a doubly-linked list.
*/
/**
* Query for the block.
*/
- GNUNET_HashCode query;
+ struct GNUNET_HashCode query;
/**
- * When does this block expire?
+ * When does this block expire?
*/
struct GNUNET_TIME_Absolute expiration;
/**
- * Peers we would consider forwarding this
+ * Peers we already forwarded this
* block to. Zero for empty entries.
*/
GNUNET_PEER_Id target_list[MIGRATION_LIST_SIZE];
};
+/**
+ * Information about a peer waiting for migratable data.
+ */
+struct MigrationReadyPeer
+{
+ /**
+ * This is a doubly-linked list.
+ */
+ struct MigrationReadyPeer *next;
+
+ /**
+ * This is a doubly-linked list.
+ */
+ struct MigrationReadyPeer *prev;
+
+ /**
+ * Handle to peer.
+ */
+ struct GSF_ConnectedPeer *peer;
+
+ /**
+ * Envelope of the currently pushed message.
+ */
+ struct GNUNET_MQ_Envelope *env;
+};
+
+
/**
* Head of linked list of blocks that can be migrated.
*/
*/
static struct MigrationReadyBlock *mig_tail;
+/**
+ * Head of linked list of peers.
+ */
+static struct MigrationReadyPeer *peer_head;
+
+/**
+ * Tail of linked list of peers.
+ */
+static struct MigrationReadyPeer *peer_tail;
+
/**
* Request to datastore for migration (or NULL).
*/
/**
* ID of task that collects blocks for migration.
*/
-static GNUNET_SCHEDULER_TaskIdentifier mig_task;
+static struct GNUNET_SCHEDULER_Task *mig_task;
/**
* What is the maximum frequency at which we are allowed to
static struct GNUNET_TIME_Relative min_migration_delay;
/**
- * Are we allowed to push out content from this peer.
+ * Size of the doubly-linked list of migration blocks.
*/
-static int active_from_migration;
+static unsigned int mig_size;
/**
- * Size of the doubly-linked list of migration blocks.
+ * Is this module enabled?
*/
-static unsigned int mig_size;
+static int enabled;
+
+/**
+ * Did we find anything in the datastore?
+ */
+static int value_found;
/**
delete_migration_block (struct MigrationReadyBlock *mb)
{
GNUNET_CONTAINER_DLL_remove (mig_head,
- mig_tail,
- mb);
+ mig_tail,
+ mb);
GNUNET_PEER_decrement_rcs (mb->target_list,
- MIGRATION_LIST_SIZE);
+ MIGRATION_LIST_SIZE);
mig_size--;
GNUNET_free (mb);
}
/**
- * Compare the distance of two peers to a key.
+ * Find content for migration to this peer.
*
- * @param key key
- * @param p1 first peer
- * @param p2 second peer
- * @return GNUNET_YES if P1 is closer to key than P2
+ * @param cls a `struct MigrationReadyPeer *`
*/
-static int
-is_closer (const GNUNET_HashCode *key,
- const struct GNUNET_PeerIdentity *p1,
- const struct GNUNET_PeerIdentity *p2)
-{
- return GNUNET_CRYPTO_hash_xorcmp (&p1->hashPubKey,
- &p2->hashPubKey,
- key);
-}
+static void
+find_content (void *cls);
/**
- * Consider migrating content to a given peer.
+ * Send the given block to the given peer.
*
- * @param cls 'struct MigrationReadyBlock*' to select
- * targets for (or NULL for none)
- * @param key ID of the peer
- * @param value 'struct ConnectedPeer' of the peer
- * @return GNUNET_YES (always continue iteration)
+ * @param peer target peer
+ * @param block the block
+ * @return #GNUNET_YES if the block was deleted (!)
*/
static int
-consider_migration (void *cls,
- const GNUNET_HashCode *key,
- void *value)
+transmit_content (struct MigrationReadyPeer *mrp,
+ struct MigrationReadyBlock *block)
{
- struct MigrationReadyBlock *mb = cls;
- struct ConnectedPeer *cp = value;
- struct MigrationReadyBlock *pos;
- struct GNUNET_PeerIdentity cppid;
- struct GNUNET_PeerIdentity otherpid;
- struct GNUNET_PeerIdentity worstpid;
- size_t msize;
+ struct PutMessage *msg;
unsigned int i;
- unsigned int repl;
-
- /* consider 'cp' as a migration target for mb */
- if (GNUNET_TIME_absolute_get_remaining (cp->migration_blocked).rel_value > 0)
- return GNUNET_YES; /* peer has requested no migration! */
- if (mb != NULL)
+ struct GSF_PeerPerformanceData *ppd;
+ int ret;
+
+ ppd = GSF_get_peer_performance_data_ (mrp->peer);
+ GNUNET_assert (NULL == mrp->env);
+ mrp->env = GNUNET_MQ_msg_extra (msg,
+ block->size,
+ GNUNET_MESSAGE_TYPE_FS_PUT);
+ msg->type = htonl (block->type);
+ msg->expiration = GNUNET_TIME_absolute_hton (block->expiration);
+ GNUNET_memcpy (&msg[1],
+ &block[1],
+ block->size);
+ for (i = 0; i < MIGRATION_LIST_SIZE; i++)
+ {
+ if (block->target_list[i] == 0)
{
- GNUNET_PEER_resolve (cp->pid,
- &cppid);
- repl = MIGRATION_LIST_SIZE;
- for (i=0;i<MIGRATION_LIST_SIZE;i++)
- {
- if (mb->target_list[i] == 0)
- {
- mb->target_list[i] = cp->pid;
- GNUNET_PEER_change_rc (mb->target_list[i], 1);
- repl = MIGRATION_LIST_SIZE;
- break;
- }
- GNUNET_PEER_resolve (mb->target_list[i],
- &otherpid);
- if ( (repl == MIGRATION_LIST_SIZE) &&
- is_closer (&mb->query,
- &cppid,
- &otherpid))
- {
- repl = i;
- worstpid = otherpid;
- }
- else if ( (repl != MIGRATION_LIST_SIZE) &&
- (is_closer (&mb->query,
- &worstpid,
- &otherpid) ) )
- {
- repl = i;
- worstpid = otherpid;
- }
- }
- if (repl != MIGRATION_LIST_SIZE)
- {
- GNUNET_PEER_change_rc (mb->target_list[repl], -1);
- mb->target_list[repl] = cp->pid;
- GNUNET_PEER_change_rc (mb->target_list[repl], 1);
- }
+ block->target_list[i] = ppd->pid;
+ GNUNET_PEER_change_rc (block->target_list[i],
+ 1);
+ break;
}
+ }
+ if (MIGRATION_LIST_SIZE == i)
+ {
+ delete_migration_block (block);
+ ret = GNUNET_YES;
+ }
+ else
+ {
+ ret = GNUNET_NO;
+ }
+ GNUNET_MQ_notify_sent (mrp->env,
+ &find_content,
+ mrp);
+ GSF_peer_transmit_ (mrp->peer,
+ GNUNET_NO,
+ 0 /* priority */,
+ mrp->env);
+ return ret;
+}
+
+
+/**
+ * Count the number of peers this block has
+ * already been forwarded to.
+ *
+ * @param block the block
+ * @return number of times block was forwarded
+ */
+static unsigned int
+count_targets (struct MigrationReadyBlock *block)
+{
+ unsigned int i;
+
+ for (i = 0; i < MIGRATION_LIST_SIZE; i++)
+ if (block->target_list[i] == 0)
+ return i;
+ return i;
+}
+
+
+/**
+ * Check if sending this block to this peer would
+ * be a good idea.
+ *
+ * @param mrp target peer
+ * @param block the block
+ * @return score (>= 0: feasible, negative: infeasible)
+ */
+static long
+score_content (struct MigrationReadyPeer *mrp,
+ struct MigrationReadyBlock *block)
+{
+ unsigned int i;
+ struct GSF_PeerPerformanceData *ppd;
+ struct GNUNET_PeerIdentity id;
+ struct GNUNET_HashCode hc;
+ uint32_t dist;
+
+ ppd = GSF_get_peer_performance_data_ (mrp->peer);
+ for (i = 0; i < MIGRATION_LIST_SIZE; i++)
+ if (block->target_list[i] == ppd->pid)
+ return -1;
+ GNUNET_assert (0 != ppd->pid);
+ GNUNET_PEER_resolve (ppd->pid,
+ &id);
+ GNUNET_CRYPTO_hash (&id,
+ sizeof(struct GNUNET_PeerIdentity),
+ &hc);
+ dist = GNUNET_CRYPTO_hash_distance_u32 (&block->query,
+ &hc);
+ /* closer distance, higher score: */
+ return UINT32_MAX - dist;
+}
+
+
+/**
+ * If the migration task is not currently running, consider
+ * (re)scheduling it with the appropriate delay.
+ */
+static void
+consider_gathering (void);
+
+
+/**
+ * Find content for migration to this peer.
+ *
+ * @param cls peer to find content for
+ */
+static void
+find_content (void *cls)
+{
+ struct MigrationReadyPeer *mrp = cls;
+ struct MigrationReadyBlock *pos;
+ long score;
+ long best_score;
+ struct MigrationReadyBlock *best;
- /* consider scheduling transmission to cp for content migration */
- if (cp->cth != NULL)
- return GNUNET_YES;
- msize = 0;
+ mrp->env = NULL;
+ best = NULL;
+ best_score = -1;
pos = mig_head;
- while (pos != NULL)
+ while (NULL != pos)
+ {
+ score = score_content (mrp, pos);
+ if (score > best_score)
{
- for (i=0;i<MIGRATION_LIST_SIZE;i++)
- {
- if (cp->pid == pos->target_list[i])
- {
- if (msize == 0)
- msize = pos->size;
- else
- msize = GNUNET_MIN (msize,
- pos->size);
- break;
- }
- }
- pos = pos->next;
+ best_score = score;
+ best = pos;
}
- if (msize == 0)
- return GNUNET_YES; /* no content available */
-#if DEBUG_FS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Trying to migrate at least %u bytes to peer `%s'\n",
- msize,
- GNUNET_h2s (key));
-#endif
- if (cp->delayed_transmission_request_task != GNUNET_SCHEDULER_NO_TASK)
+ pos = pos->next;
+ }
+ if (NULL == best)
+ {
+ if (mig_size < MAX_MIGRATION_QUEUE)
{
- GNUNET_SCHEDULER_cancel (cp->delayed_transmission_request_task);
- cp->delayed_transmission_request_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No content found for pushing, waiting for queue to fill\n");
+ return; /* will fill up eventually... */
}
- cp->cth
- = GNUNET_CORE_notify_transmit_ready (core,
- 0, GNUNET_TIME_UNIT_FOREVER_REL,
- (const struct GNUNET_PeerIdentity*) key,
- msize + sizeof (struct PutMessage),
- &transmit_to_peer,
- cp);
- return GNUNET_YES;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No suitable content found, purging content from full queue\n");
+ /* failed to find migration target AND
+ * queue is full, purge most-forwarded
+ * block from queue to make room for more */
+ pos = mig_head;
+ while (NULL != pos)
+ {
+ score = count_targets (pos);
+ if (score >= best_score)
+ {
+ best_score = score;
+ best = pos;
+ }
+ pos = pos->next;
+ }
+ GNUNET_assert (NULL != best);
+ delete_migration_block (best);
+ consider_gathering ();
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Preparing to push best content to peer\n");
+ transmit_content (mrp,
+ best);
}
/**
* Task that is run periodically to obtain blocks for content
* migration
- *
+ *
* @param cls unused
- * @param tc scheduler context (also unused)
*/
static void
-gather_migration_blocks (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc);
-
-
+gather_migration_blocks (void *cls);
/**
* (re)scheduling it with the appropriate delay.
*/
static void
-consider_migration_gathering ()
+consider_gathering ()
{
struct GNUNET_TIME_Relative delay;
- if (dsh == NULL)
+ if (NULL == GSF_dsh)
return;
- if (mig_qe != NULL)
+ if (NULL != mig_qe)
return;
- if (mig_task != GNUNET_SCHEDULER_NO_TASK)
+ if (NULL != mig_task)
+ return;
+ if (mig_size >= MAX_MIGRATION_QUEUE)
return;
delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
- mig_size);
+ mig_size);
delay = GNUNET_TIME_relative_divide (delay,
- MAX_MIGRATION_QUEUE);
+ MAX_MIGRATION_QUEUE);
delay = GNUNET_TIME_relative_max (delay,
- min_migration_delay);
+ min_migration_delay);
+ if (GNUNET_NO == value_found)
+ {
+ /* wait at least 5s if the datastore is empty */
+ delay = GNUNET_TIME_relative_max (delay,
+ GNUNET_TIME_relative_multiply (
+ GNUNET_TIME_UNIT_SECONDS,
+ 5));
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Scheduling gathering task (queue size: %u)\n",
+ mig_size);
mig_task = GNUNET_SCHEDULER_add_delayed (delay,
- &gather_migration_blocks,
- NULL);
+ &gather_migration_blocks,
+ NULL);
}
-
-
/**
* Process content offered for migration.
*
* @param type type of the content
* @param priority priority of the content
* @param anonymity anonymity-level for the content
+ * @param replication replication-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_migration_content (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)
+ const struct GNUNET_HashCode *key,
+ size_t size,
+ const void *data,
+ enum GNUNET_BLOCK_Type type,
+ uint32_t priority,
+ uint32_t anonymity,
+ uint32_t replication,
+ struct GNUNET_TIME_Absolute expiration,
+ uint64_t uid)
{
struct MigrationReadyBlock *mb;
-
- if (key == NULL)
- {
- mig_qe = NULL;
- if (mig_size < MAX_MIGRATION_QUEUE)
- consider_migration_gathering ();
- return;
- }
- if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value <
- MIN_MIGRATION_CONTENT_LIFETIME.rel_value)
- {
- /* content will expire soon, don't bother */
- GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
- return;
- }
+ struct MigrationReadyPeer *pos;
+
+ mig_qe = NULL;
+ if (NULL == key)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No content found for migration...\n");
+ consider_gathering ();
+ return;
+ }
+ value_found = GNUNET_YES;
+ if (GNUNET_TIME_absolute_get_remaining (expiration).rel_value_us <
+ MIN_MIGRATION_CONTENT_LIFETIME.rel_value_us)
+ {
+ /* content will expire soon, don't bother */
+ consider_gathering ();
+ return;
+ }
if (type == GNUNET_BLOCK_TYPE_FS_ONDEMAND)
- {
- if (GNUNET_OK !=
- GNUNET_FS_handle_on_demand_block (key, size, data,
- type, priority, anonymity,
- expiration, uid,
- &process_migration_content,
- NULL))
- {
- GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
- }
- return;
- }
-#if DEBUG_FS
+ {
+ if (GNUNET_OK !=
+ GNUNET_FS_handle_on_demand_block (key,
+ size,
+ data,
+ type,
+ priority,
+ anonymity,
+ replication,
+ expiration,
+ uid,
+ &process_migration_content,
+ NULL))
+ consider_gathering ();
+ return;
+ }
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Retrieved block `%s' of type %u for migration\n",
- GNUNET_h2s (key),
- type);
-#endif
- mb = GNUNET_malloc (sizeof (struct MigrationReadyBlock) + size);
+ "Retrieved block `%s' of type %u for migration (queue size: %u/%u)\n",
+ GNUNET_h2s (key),
+ type, mig_size + 1,
+ MAX_MIGRATION_QUEUE);
+ mb = GNUNET_malloc (sizeof(struct MigrationReadyBlock) + size);
mb->query = *key;
mb->expiration = expiration;
mb->size = size;
mb->type = type;
- memcpy (&mb[1], data, size);
+ GNUNET_memcpy (&mb[1], data, size);
GNUNET_CONTAINER_DLL_insert_after (mig_head,
- mig_tail,
- mig_tail,
- mb);
+ mig_tail,
+ mig_tail,
+ mb);
mig_size++;
- GNUNET_CONTAINER_multihashmap_iterate (connected_peers,
- &consider_migration,
- mb);
- GNUNET_DATASTORE_get_next (dsh, GNUNET_YES);
+ for (pos = peer_head; NULL != pos; pos = pos->next)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Preparing to push best content to peer %s\n",
+ GNUNET_i2s (GSF_connected_peer_get_identity2_ (pos->peer)));
+ if ((NULL == pos->env) &&
+ (GNUNET_YES == transmit_content (pos,
+ mb)))
+ {
+ break; /* 'mb' was freed! */
+ }
+ }
+ consider_gathering ();
}
-
/**
* Task that is run periodically to obtain blocks for content
* migration
- *
+ *
* @param cls unused
- * @param tc scheduler context (also unused)
*/
static void
-gather_migration_blocks (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+gather_migration_blocks (void *cls)
{
- mig_task = GNUNET_SCHEDULER_NO_TASK;
- if (dsh != NULL)
- {
- mig_qe = GNUNET_DATASTORE_get_random (dsh, 0, UINT_MAX,
- GNUNET_TIME_UNIT_FOREVER_REL,
- &process_migration_content, NULL);
- GNUNET_assert (mig_qe != NULL);
- }
+ mig_task = NULL;
+ if (mig_size >= MAX_MIGRATION_QUEUE)
+ return;
+ if (NULL == GSF_dsh)
+ return;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Asking datastore for content for replication (queue size: %u)\n",
+ mig_size);
+ value_found = GNUNET_NO;
+ mig_qe = GNUNET_DATASTORE_get_for_replication (GSF_dsh,
+ 0,
+ UINT_MAX,
+ &process_migration_content,
+ NULL);
+ if (NULL == mig_qe)
+ consider_gathering ();
}
+/**
+ * A peer connected to us. Start pushing content
+ * to this peer.
+ *
+ * @param peer handle for the peer that connected
+ */
+void
+GSF_push_start_ (struct GSF_ConnectedPeer *peer)
+{
+ struct MigrationReadyPeer *mrp;
+
+ if (GNUNET_YES != enabled)
+ return;
+ for (mrp = peer_head; NULL != mrp; mrp = mrp->next)
+ if (mrp->peer == peer)
+ break;
+ if (NULL != mrp)
+ {
+ /* same peer added twice, must not happen */
+ GNUNET_break (0);
+ return;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Adding peer %s to list for pushing\n",
+ GNUNET_i2s (GSF_connected_peer_get_identity2_ (peer)));
+
+ mrp = GNUNET_new (struct MigrationReadyPeer);
+ mrp->peer = peer;
+ find_content (mrp);
+ GNUNET_CONTAINER_DLL_insert (peer_head,
+ peer_tail,
+ mrp);
+}
+
-size_t
-API_ (void *cls,
- size_t size, void *buf)
+/**
+ * A peer disconnected from us. Stop pushing content
+ * to this peer.
+ *
+ * @param peer handle for the peer that disconnected
+ */
+void
+GSF_push_stop_ (struct GSF_ConnectedPeer *peer)
{
- next = mig_head;
- while (NULL != (mb = next))
- {
- next = mb->next;
- for (i=0;i<MIGRATION_LIST_SIZE;i++)
- {
- if ( (cp->pid == mb->target_list[i]) &&
- (mb->size + sizeof (migm) <= size) )
- {
- GNUNET_PEER_change_rc (mb->target_list[i], -1);
- mb->target_list[i] = 0;
- mb->used_targets++;
- memset (&migm, 0, sizeof (migm));
- migm.header.size = htons (sizeof (migm) + mb->size);
- migm.header.type = htons (GNUNET_MESSAGE_TYPE_FS_PUT);
- migm.type = htonl (mb->type);
- migm.expiration = GNUNET_TIME_absolute_hton (mb->expiration);
- memcpy (&cbuf[msize], &migm, sizeof (migm));
- msize += sizeof (migm);
- size -= sizeof (migm);
- memcpy (&cbuf[msize], &mb[1], mb->size);
- msize += mb->size;
- size -= mb->size;
-#if DEBUG_FS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Pushing migration block `%s' (%u bytes) to `%s'\n",
- GNUNET_h2s (&mb->query),
- (unsigned int) mb->size,
- GNUNET_i2s (&pid));
-#endif
- break;
- }
- else
- {
-#if DEBUG_FS
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Migration block `%s' (%u bytes) is not on migration list for peer `%s'\n",
- GNUNET_h2s (&mb->query),
- (unsigned int) mb->size,
- GNUNET_i2s (&pid));
-#endif
- }
- }
- if ( (mb->used_targets >= MIGRATION_TARGET_COUNT) ||
- (mb->used_targets >= GNUNET_CONTAINER_multihashmap_size (connected_peers)) )
- {
- delete_migration_block (mb);
- consider_migration_gathering ();
- }
- }
- consider_migration (NULL,
- &pid.hashPubKey,
- cp);
+ struct MigrationReadyPeer *pos;
+ for (pos = peer_head; NULL != pos; pos = pos->next)
+ if (pos->peer == peer)
+ break;
+ if (NULL == pos)
+ return;
+ if (NULL != pos->env)
+ GNUNET_MQ_send_cancel (pos->env);
+ GNUNET_CONTAINER_DLL_remove (peer_head,
+ peer_tail,
+ pos);
+ GNUNET_free (pos);
}
+/**
+ * Setup the module.
+ */
+void
+GSF_push_init_ ()
+{
+ enabled =
+ GNUNET_CONFIGURATION_get_value_yesno (GSF_cfg,
+ "FS",
+ "CONTENT_PUSHING");
+ if (GNUNET_YES != enabled)
+ return;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_time (GSF_cfg,
+ "fs",
+ "MIN_MIGRATION_DELAY",
+ &min_migration_delay))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
+ "fs",
+ "MIN_MIGRATION_DELAY",
+ _ ("time required, content pushing disabled"));
+ return;
+ }
+ consider_gathering ();
+}
+
+
+/**
+ * Shutdown the module.
+ */
+void
+GSF_push_done_ ()
+{
+ if (NULL != mig_task)
+ {
+ GNUNET_SCHEDULER_cancel (mig_task);
+ mig_task = NULL;
+ }
+ if (NULL != mig_qe)
+ {
+ GNUNET_DATASTORE_cancel (mig_qe);
+ mig_qe = NULL;
+ }
+ while (NULL != mig_head)
+ delete_migration_block (mig_head);
+ GNUNET_assert (0 == mig_size);
+}
+/* end of gnunet-service-fs_push.c */
projects / oweals / gnunet.git / blobdiff