fix recorder

pkg/weather/recorder/recorder_get.go

@@ -26,7 +26,7 @@ func (w *WeatherRecorder) Get(ctx context.Context, last int) (
 	span.SetAttributes(
 		attribute.Int("last", last),
 		attribute.Int("keep", w.keep),
-		attribute.Int("currentSize", w.Count()),
+		attribute.Int("currentSize", w.Count(ctx)),
 	)
 	defer span.End()
 
@@ -47,7 +47,7 @@ func (w *WeatherRecorder) get(ctx context.Context, last int) (
 	span := trace.SpanFromContext(ctx)
 
 	w.RLock()
-	defer w.Unlock()
+	defer w.RUnlock()
 
 	span.AddEvent("acquired lock on recorder cache")
 
@@ -70,8 +70,8 @@ func (w *WeatherRecorder) get(ctx context.Context, last int) (
 }
 
 // Returns count of retained weather updates
-func (w *WeatherRecorder) Count() int {
-	_, span := w.tracer.Start(w.ctx, "countWeatherRecorder")
+func (w *WeatherRecorder) Count(ctx context.Context) int {
+	_, span := w.tracer.Start(ctx, "countWeatherRecorder")
 	defer span.End()
 
 	count := w.count()

pkg/weather/recorder/recorder_set.go

@@ -10,9 +10,9 @@ import (
 )
 
 func (w *WeatherRecorder) Set(ctx context.Context, u *weather.WeatherUpdate) error {
-	_, span := w.tracer.Start(ctx, "recordWeatherUpdate")
+	ctx, span := w.tracer.Start(ctx, "recordWeatherUpdate")
 	span.SetAttributes(
-		attribute.Int("countWeatherUpdates", w.Count()),
+		attribute.Int("countWeatherUpdates", w.Count(ctx)),
 		attribute.Int("keepUpdates", w.keep),
 	)
 	defer span.End()