refactor state to recorder, finish implementing

pkg/weather/recorder/recorder.go

@@ -0,0 +1,42 @@
+package recorder
+
+import (
+	"context"
+	"sync"
+
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/trace"
+
+	"gitea.libretechconsulting.com/rmcguire/go-app/pkg/otel"
+
+	"gitea.libretechconsulting.com/rmcguire/ambient-local-exporter/pkg/weather"
+)
+
+type WeatherRecorder struct {
+	updates []*weather.WeatherUpdate
+	keep    int
+	ctx     context.Context
+	tracer  trace.Tracer
+	meter   metric.Meter
+	*sync.RWMutex
+}
+
+type Opts struct {
+	Ctx      context.Context
+	KeepLast int
+}
+
+func NewWeatherRecorder(opts *Opts) *WeatherRecorder {
+	if opts.KeepLast < 1 {
+		opts.KeepLast = 1
+	}
+
+	return &WeatherRecorder{
+		updates: make([]*weather.WeatherUpdate, 0, opts.KeepLast),
+		keep:    opts.KeepLast,
+		ctx:     opts.Ctx,
+		tracer:  otel.GetTracer(opts.Ctx, "weatherRecorder"),
+		meter:   otel.GetMeter(opts.Ctx, "weatherRecorder"),
+		RWMutex: &sync.RWMutex{},
+	}
+}