collect and log statistics about onionskins received/processed

we skip onionskins that came from non-relays, so we're less likely to
run into privacy troubles.

starts to implement ticket 9658.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/or/rephist.c b/src/or/rephist.c
index 55f321d5f..131e531b1 100644
--- a/src/or/rephist.c
+++ b/src/or/rephist.c
@@ -3011,6 +3011,47 @@ rep_hist_conn_stats_write(time_t now)
   return start_of_conn_stats_interval + WRITE_STATS_INTERVAL;
 }
 
+/** Internal statistics to track how many requests of each type of
+ * handshake we've received, and how many we've completed. Useful for
+ * seeing trends in cpu load.
+ * @{ */
+static int onion_handshakes_requested[MAX_ONION_HANDSHAKE_TYPE+1] = {0};
+static int onion_handshakes_completed[MAX_ONION_HANDSHAKE_TYPE+1] = {0};
+/**@}*/
+
+/** A new onionskin (using the <b>type</b> handshake) has arrived. */
+void
+rep_hist_note_circuit_handshake_requested(uint16_t type)
+{
+  if (type <= MAX_ONION_HANDSHAKE_TYPE)
+    onion_handshakes_requested[type]++;
+}
+
+/** We've sent an onionskin (using the <b>type</b> handshake) to a
+ * cpuworker. */
+void
+rep_hist_note_circuit_handshake_completed(uint16_t type)
+{
+  if (type <= MAX_ONION_HANDSHAKE_TYPE)
+    onion_handshakes_completed[type]++;
+}
+
+/** Log our onionskin statistics since the last time we were called. */
+void
+rep_hist_log_circuit_handshake_stats(time_t now)
+{
+  (void)now;
+  /* XXX024 maybe quiet this log message before 0.2.4 goes stable for real */
+  log_notice(LD_HIST, "Circuit handshake stats since last time: "
+             "%d/%d TAP, %d/%d NTor.",
+             onion_handshakes_completed[ONION_HANDSHAKE_TYPE_TAP],
+             onion_handshakes_requested[ONION_HANDSHAKE_TYPE_TAP],
+             onion_handshakes_completed[ONION_HANDSHAKE_TYPE_NTOR],
+             onion_handshakes_requested[ONION_HANDSHAKE_TYPE_NTOR]);
+  memset(onion_handshakes_completed, 0, sizeof(onion_handshakes_completed));
+  memset(onion_handshakes_requested, 0, sizeof(onion_handshakes_requested));
+}
+
 /** Free all storage held by the OR/link history caches, by the
  * bandwidth history arrays, by the port history, or by statistics . */
 void