Convert bufferevents to use rate-limiting.

This requires the latest Git version of Libevent as of 24 March 2010.
In the future, we'll just say it requires Libevent 2.0.5-alpha or
later.

Since Libevent doesn't yet support hierarchical rate limit groups,
there isn't yet support for tracking relayed-bytes separately when
using the bufferevent system.  If a future version does add support
for hierarchical buckets, we can add that back in.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/common/compat_libevent.c b/src/common/compat_libevent.c
index 250fa2bdb..2ae280e66 100644
--- a/src/common/compat_libevent.c
+++ b/src/common/compat_libevent.c
@@ -551,3 +551,27 @@ periodic_timer_free(periodic_timer_t *timer)
   tor_free(timer);
 }
 
+#ifdef USE_BUFFEREVENTS
+static const struct timeval *one_tick = NULL;
+/**
+   DOCDOC
+*/
+const struct timeval *tor_libevent_get_one_tick_timeout(void)
+{
+
+  if (PREDICT_UNLIKELY(one_tick == NULL)) {
+    struct event_base *base = tor_libevent_get_base();
+    struct timeval tv;
+    if (TOR_LIBEVENT_TICKS_PER_SECOND == 1) {
+      tv.tv_sec = 1;
+      tv.tv_usec = 0;
+    } else {
+      tv.tv_sec = 0;
+      tv.tv_usec = 1000000 / TOR_LIBEVENT_TICKS_PER_SECOND;
+    }
+    one_tick = event_base_init_common_timeout(base, &tv);
+  }
+  return one_tick;
+}
+#endif
+