implement grpc weather

pkg/weather/state/state_set.go

@@ -0,0 +1,35 @@
+package state
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+
+	"gitea.libretechconsulting.com/rmcguire/ambient-local-exporter/pkg/weather"
+)
+
+func (w *WeatherState) Set(ctx context.Context, u *weather.WeatherUpdate) error {
+	_, span := w.tracer.Start(ctx, "setWeatherState")
+	span.SetAttributes(
+		attribute.Int("countWeatherUpdates", w.Count()),
+		attribute.Int("keepUpdates", w.keep),
+	)
+	defer span.End()
+
+	return w.set(span, u)
+}
+
+func (w *WeatherState) set(span trace.Span, u *weather.WeatherUpdate) error {
+	w.Lock()
+	defer w.Unlock()
+
+	if len(w.updates) > w.keep {
+		w.updates = w.updates[1:]
+		span.AddEvent("trimmed state updates by 1")
+	}
+
+	w.updates = append(w.updates, u)
+	span.AddEvent("recorded weather state")
+	return nil
+}