improve redis recorder

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

@@ -38,8 +38,9 @@ func (r *RedisRecorder) get(ctx context.Context, req *pb.GetWeatherRequest) (
 	}
 
 	span.SetAttributes(attribute.Int("limit", limit))
+	r.log.Debug().Int("limit", limit).Msg("getting updates from redis")
 
-	datas, err := r.redis.LRange(ctx, r.Key(), 0, int64(limit)).Result()
+	datas, err := r.redis.LRange(ctx, r.Key(), 0, int64(limit)-1).Result()
 	if err != nil {
 		span.RecordError(err)
 		span.SetStatus(codes.Error, err.Error())
@@ -48,6 +49,7 @@ func (r *RedisRecorder) get(ctx context.Context, req *pb.GetWeatherRequest) (
 	}
 
 	span.AddEvent("redis queried")
+	r.log.Debug().Int("results", len(datas)).Msg("redis queried")
 
 	updates, err := jsonDatasToUpdates(datas)
 	if err != nil {
@@ -87,7 +89,7 @@ func jsonDatasToUpdates(datas []string) ([]*weather.WeatherUpdate, error) {
 		err := json.Unmarshal([]byte(data), update)
 		errs = errors.Join(errs, err)
 
-		if err != nil {
+		if err == nil {
 			updates = append(updates, update)
 		}
 	}

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

@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 
+	"github.com/redis/go-redis/v9"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
 	"go.opentelemetry.io/otel/trace"
@@ -20,7 +21,7 @@ func (r *RedisRecorder) Set(ctx context.Context, u *weather.WeatherUpdate) error
 	defer span.End()
 
 	r.Lock()
-	defer r.RUnlock()
+	defer r.Unlock()
 
 	// First ensure we can prepare our payload
 	data, err := json.Marshal(u)
@@ -42,11 +43,14 @@ func (r *RedisRecorder) set(ctx context.Context, data []byte) error {
 	defer span.End()
 
 	// Atomic, push and trim
-	tx := r.redis.TxPipeline()
-	tx.LPush(ctx, r.Key(), data)
-	tx.LTrim(ctx, r.Key(), 0, int64(r.keep)-1)
-
-	if rErr, err := tx.Exec(ctx); err != nil {
+	var count *redis.IntCmd
+	rErr, err := r.redis.TxPipelined(ctx, func(pipe redis.Pipeliner) error {
+		pipe.LPush(ctx, r.Key(), data)
+		pipe.LTrim(ctx, r.Key(), 0, int64(r.keep)-1)
+		count = pipe.LLen(ctx, r.Key())
+		return nil
+	})
+	if err != nil {
 		for _, cmd := range rErr {
 			span.RecordError(cmd.Err())
 		}
@@ -55,7 +59,16 @@ func (r *RedisRecorder) set(ctx context.Context, data []byte) error {
 		return err
 	}
 
-	span.SetAttributes(attribute.Int("updateCount", r.count(ctx)))
+	// Get new update count
+
+	r.log.Debug().
+		Int("updateBytes", len(data)).
+		Int64("updateCount", count.Val()).
+		Str("redis", r.redis.String()).
+		Str("key", r.Key()).
+		Msg("pushed update to redis")
+
+	span.SetAttributes(attribute.Int64("updateCount", count.Val()))
 	span.SetStatus(codes.Ok, "")
 	return nil
 }