implement redis and noop recorders

pkg/weather/recorder/recorders/memory/memory.go

@@ -12,7 +12,10 @@ import (
 	"gitea.libretechconsulting.com/rmcguire/ambient-local-exporter/pkg/weather/recorder/recorders"
 )
 
-const defRetainLast = 120
+const (
+	DEF_RETAIN_LAST = 120
+	NAME            = "memory recorder"
+)
 
 type MemoryRecorder struct {
 	baseCtx context.Context
@@ -24,7 +27,7 @@ type MemoryRecorder struct {
 
 func (r *MemoryRecorder) Init(ctx context.Context, opts *recorders.RecorderOpts) {
 	if opts.RetainLast < 1 {
-		opts.RetainLast = defRetainLast
+		opts.RetainLast = DEF_RETAIN_LAST
 	}
 
 	r.updates = make([]*weather.WeatherUpdate, 0, opts.RetainLast)
@@ -33,3 +36,5 @@ func (r *MemoryRecorder) Init(ctx context.Context, opts *recorders.RecorderOpts)
 	r.RWMutex = &sync.RWMutex{}
 	r.tracer = otel.GetTracer(r.baseCtx, "memoryRecorder")
 }
+
+func (r *MemoryRecorder) Name() string { return NAME }

pkg/weather/recorder/recorders/noop/noop.go

@@ -19,3 +19,5 @@ func (n *NoopRecorder) Get(context.Context, *pb.GetWeatherRequest) ([]*weather.W
 }
 
 func (n *NoopRecorder) Count(context.Context) int { return 0 }
+
+func (r *NoopRecorder) Name() string { return "no-op recorder" }

pkg/weather/recorder/recorders/recorders.go

@@ -19,4 +19,5 @@ type Recorder interface {
 	Set(context.Context, *weather.WeatherUpdate) error
 	Get(context.Context, *pb.GetWeatherRequest) ([]*weather.WeatherUpdate, error)
 	Count(context.Context) int // Best Effort
+	Name() string
 }

pkg/weather/recorder/recorders/redis/redis.go

@@ -22,6 +22,7 @@ import (
 const (
 	DEF_RETAIN  = 120
 	UPDATES_KEY = "weatherUpdates"
+	NAME        = "redis recorder"
 )
 
 type RedisRecorder struct {
@@ -36,11 +37,19 @@ type RedisRecorder struct {
 }
 
 func (r *RedisRecorder) Init(ctx context.Context, opts *recorders.RecorderOpts) {
+	if opts.AppConfig.RecorderConfig.RedisConfig == nil {
+		panic("refusing to init redis recorder with no redisConfig")
+	}
+
 	if opts.RetainLast < 1 {
 		opts.RetainLast = DEF_RETAIN
 	}
 
-	r.log = zerolog.Ctx(opts.BaseCtx)
+	r.config = opts.AppConfig
+	r.keep = opts.RetainLast
+	r.RWMutex = &sync.RWMutex{}
+	r.baseCtx = opts.BaseCtx
+	r.log = zerolog.Ctx(r.baseCtx)
 
 	r.tracer = otel.GetTracer(r.baseCtx, "redisRecorder")
 	ctx, span := r.tracer.Start(ctx, "redisRecorder.init", trace.WithAttributes(
@@ -51,11 +60,6 @@ func (r *RedisRecorder) Init(ctx context.Context, opts *recorders.RecorderOpts)
 	))
 	defer span.End()
 
-	r.config = opts.AppConfig
-	r.keep = opts.RetainLast
-	r.baseCtx = opts.BaseCtx
-	r.RWMutex = &sync.RWMutex{}
-
 	// Unique key prefix for this version/env/name of exporter
 	// will be consistent across replicas, but resets on upgrade
 	// as it is using version
@@ -106,3 +110,5 @@ func (r *RedisRecorder) MustInitRedis(ctx context.Context) {
 func (r *RedisRecorder) Key() string {
 	return fmt.Sprintf("%s:%s", r.appKey, UPDATES_KEY)
 }
+
+func (r *RedisRecorder) Name() string { return NAME }