feat(ecache): using redis as a cache implementation

Author: voidint

ecache/redis/redis_cache.go

@@ -0,0 +1,51 @@
+package redis
+
+import (
+	"context"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/redis/go-redis/v9"
+)
+
+type cache struct {
+	rdb *redis.Client
+}
+
+func NewCache(client *redis.Client) *cache {
+	return &cache{
+		rdb: client,
+	}
+}
+
+func (c *cache) Del(ctx context.Context, keys ...string) (affected int64, err error) {
+	if affected, err = c.rdb.Del(ctx, keys...).Result(); err != nil {
+		return affected, errors.WithStack(err)
+	}
+	return affected, nil
+}
+
+func (c *cache) Get(ctx context.Context, key string) (val []byte, err error) {
+	if val, err = c.rdb.Get(ctx, key).Bytes(); err != nil {
+		return nil, errors.WithStack(err)
+	}
+	return val, nil
+}
+
+func (c *cache) GetAsUint64(ctx context.Context, key string) (val uint64, err error) {
+	if val, err = c.rdb.Get(ctx, key).Uint64(); err != nil {
+		return 0, errors.WithStack(err)
+	}
+	return val, nil
+}
+
+func (c *cache) Set(ctx context.Context, key string, val []byte, expire time.Duration) (err error) {
+	if err = c.rdb.Set(ctx, key, val, expire).Err(); err != nil {
+		return errors.WithStack(err)
+	}
+	return nil
+}
+
+func (c *cache) IsKeyNotFound(err error) bool {
+	return errors.Is(err, redis.Nil)
+}