log to influx once (#1438)

src/counter.rs

@@ -72,7 +72,6 @@ impl Counter {
             self.lograte.store(lograte, Ordering::Relaxed);
         }
         if times % lograte == 0 && times > 0 {
-            let lastlog = self.lastlog.load(Ordering::Relaxed);
             info!(
                 "COUNTER:{{\"name\": \"{}\", \"counts\": {}, \"samples\": {},  \"now\": {}, \"events\": {}}}",
                 self.name,
@@ -81,6 +80,12 @@ impl Counter {
                 timing::timestamp(),
                 events,
             );
+
+            let lastlog = self.lastlog.load(Ordering::Relaxed);
+            let prev = self
+                .lastlog
+                .compare_and_swap(lastlog, counts, Ordering::Relaxed);
+            if prev == lastlog {
                 metrics::submit(
                     influxdb::Point::new(&format!("counter-{}", self.name))
                         .add_field(
@@ -88,8 +93,7 @@ impl Counter {
                             influxdb::Value::Integer(counts as i64 - lastlog as i64),
                         ).to_owned(),
                 );
-            self.lastlog
+            }
-                .compare_and_swap(lastlog, counts, Ordering::Relaxed);
         }
     }
 }