3 files changed, 43 insertions, 1 deletions

diff --git a/src/or/geoip.c b/src/or/geoip.c
index 5564b72a04..120ce479cc 100644
--- a/src/or/geoip.c
+++ b/src/or/geoip.c
@@ -1436,6 +1436,39 @@ format_bridge_stats_controller(time_t now)
   return out;
 }
 
+/** Return a newly allocated string holding our bridge usage stats by
+ * country in a format suitable for inclusion in our heartbeat
+ * message. Return NULL on failure.  */
+char *
+format_client_stats_heartbeat(time_t now)
+{
+  const int n_hours = 6;
+  char *out = NULL;
+  int n_clients = 0;
+  clientmap_entry_t **ent;
+  unsigned cutoff = (unsigned)( (now-n_hours*3600)/60 );
+
+  if (!start_of_bridge_stats_interval)
+    return NULL; /* Not initialized. */
+
+  /* count unique IPs */
+  HT_FOREACH(ent, clientmap, &client_history) {
+    /* only count directly connecting clients */
+    if ((*ent)->action != GEOIP_CLIENT_CONNECT)
+      continue;
+    if ((*ent)->last_seen_in_minutes < cutoff)
+      continue;
+    n_clients++;
+  }
+
+  tor_asprintf(&out, "Heartbeat: "
+               "In the last %d hours, I have seen %d unique clients.",
+               n_hours,
+               n_clients);
+
+  return out;
+}
+
 /** Write bridge statistics to $DATADIR/stats/bridge-stats and return
  * when we should next try to write statistics. */
 time_t
diff --git a/src/or/geoip.h b/src/or/geoip.h
index 683ec073b2..8a3486c7ac 100644
--- a/src/or/geoip.h
+++ b/src/or/geoip.h
@@ -64,6 +64,7 @@ time_t geoip_bridge_stats_write(time_t now);
 void geoip_bridge_stats_term(void);
 const char *geoip_get_bridge_stats_extrainfo(time_t);
 char *geoip_get_bridge_stats_controller(time_t);
+char *format_client_stats_heartbeat(time_t now);
 
 #endif
 
diff --git a/src/or/status.c b/src/or/status.c
index 0717070a05..98db688e5b 100644
--- a/src/or/status.c
+++ b/src/or/status.c
@@ -23,6 +23,7 @@
 #include "statefile.h"
 
 static void log_accounting(const time_t now, const or_options_t *options);
+#include "geoip.h"
 
 /** Return the total number of circuits. */
 STATIC int
@@ -92,7 +93,6 @@ log_heartbeat(time_t now)
   const int hibernating = we_are_hibernating();
 
   const or_options_t *options = get_options();
-  (void)now;
 
   if (public_server_mode(options) && !hibernating) {
     /* Let's check if we are in the current cached consensus. */
@@ -132,6 +132,14 @@ log_heartbeat(time_t now)
 
   circuit_log_ancient_one_hop_circuits(1800);
 
+  if (options->BridgeRelay) {
+    char *msg = NULL;
+    msg = format_client_stats_heartbeat(now);
+    if (msg)
+      log_notice(LD_HEARTBEAT, "%s", msg);
+    tor_free(msg);
+  }
+
   tor_free(uptime);
   tor_free(bw_sent);
   tor_free(bw_rcvd);