X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fats%2Fgnunet-service-ats_reservations.c;h=cb95ad80f248e765e4ad73b808e5e6c37b0fca85;hb=bfdb0abc074a99a7d24ca408f38cfda128d4132b;hp=3356aefbd409b2e1c9e2ba02454c8a030d3aae84;hpb=d86cd012c0372c1746fed2a50b7cccca9de99be3;p=oweals%2Fgnunet.git

diff --git a/src/ats/gnunet-service-ats_reservations.c b/src/ats/gnunet-service-ats_reservations.c
index 3356aefbd..cb95ad80f 100644
--- a/src/ats/gnunet-service-ats_reservations.c
+++ b/src/ats/gnunet-service-ats_reservations.c
@@ -26,14 +26,136 @@
 #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 */