#include "platform.h"
#include "gnunet-service-ats_reservations.h"
+/**
+ * Number of seconds that available bandwidth carries over
+ * (can accumulate).
+ */
+#define MAX_BANDWIDTH_CARRY_S 5
+
+/**
+ * Map of peer identities to 'struct GNUNET_BANDWIDTH_Tracker *'s
+ */
+static struct GNUNET_CONTAINER_MultiPeerMap *trackers;
+
+
+/**
+ * Reserve the given amount of incoming bandwidth (in bytes) from the
+ * given peer. If a reservation is not possible right now, return how
+ * long the client should wait before trying again.
+ *
+ * @param peer peer to reserve bandwidth from
+ * @param amount number of bytes to reserve
+ * @return 0 if the reservation was successful, FOREVER if the
+ * peer is not connected, otherwise the time to wait
+ * until the reservation might succeed
+ */
struct GNUNET_TIME_Relative
GAS_reservations_reserve (const struct GNUNET_PeerIdentity *peer,
- int32_t amount)
+ int32_t amount)
{
- /* FIXME: implement... */
- /* permit all reservations instantly for now */
+ struct GNUNET_BANDWIDTH_Tracker *tracker;
+ struct GNUNET_TIME_Relative ret;
+
+ tracker = GNUNET_CONTAINER_multipeermap_get (trackers, peer);
+ if (NULL == tracker)
+ return GNUNET_TIME_UNIT_ZERO; /* not connected, satisfy now */
+ if (amount >= 0)
+ {
+ ret = GNUNET_BANDWIDTH_tracker_get_delay (tracker, amount);
+ if (ret.rel_value_us > 0)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Delay to satisfy reservation for %d bytes is %s\n",
+ (int) amount,
+ GNUNET_STRINGS_relative_time_to_string (ret,
+ GNUNET_YES));
+ return ret;
+ }
+ }
+ (void) GNUNET_BANDWIDTH_tracker_consume (tracker, amount);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Reserved %d bytes\n", (int) amount);
return GNUNET_TIME_UNIT_ZERO;
}
+
+/**
+ * Set the amount of bandwidth the other peer could currently transmit
+ * to us (as far as we know) to the given value.
+ *
+ * @param peer identity of the peer
+ * @param bandwidth_in currently available bandwidth from that peer to
+ * this peer (estimate)
+ */
+void
+GAS_reservations_set_bandwidth (const struct GNUNET_PeerIdentity *peer,
+ struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
+{
+ struct GNUNET_BANDWIDTH_Tracker *tracker;
+
+ tracker = GNUNET_CONTAINER_multipeermap_get (trackers, peer);
+ if (0 == ntohl (bandwidth_in.value__))
+ {
+ if (NULL == tracker)
+ return;
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_remove (trackers,
+ peer,
+ tracker));
+ GNUNET_free (tracker);
+ return;
+ }
+ if (NULL == tracker)
+ {
+ tracker = GNUNET_new (struct GNUNET_BANDWIDTH_Tracker);
+ GNUNET_BANDWIDTH_tracker_init (tracker, NULL, NULL, bandwidth_in,
+ MAX_BANDWIDTH_CARRY_S);
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_put (trackers, peer, tracker,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
+ return;
+ }
+ GNUNET_BANDWIDTH_tracker_update_quota (tracker, bandwidth_in);
+}
+
+
+/**
+ * Initialize reservations subsystem.
+ */
+void
+GAS_reservations_init ()
+{
+ trackers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
+}
+
+
+/**
+ * Free memory of bandwidth tracker.
+ *
+ * @param cls NULL
+ * @param key peer identity (unused)
+ * @param value the 'struct GNUNET_BANDWIDTH_Tracker' to free
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+free_tracker (void *cls,
+ const struct GNUNET_PeerIdentity *key, void *value)
+{
+ struct GNUNET_BANDWIDTH_Tracker *tracker = value;
+
+ GNUNET_free (tracker);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Shutdown reservations subsystem.
+ */
+void
+GAS_reservations_done ()
+{
+ GNUNET_CONTAINER_multipeermap_iterate (trackers, &free_tracker, NULL);
+ GNUNET_CONTAINER_multipeermap_destroy (trackers);
+}
+
/* end of gnunet-service-ats_reservations.c */