feat(ecache): using memory as a cache implementation

Author: voidint

ecache/memory/memory_cache.go

@@ -0,0 +1,59 @@
+package memory
+
+import (
+	"context"
+	"strconv"
+	"time"
+
+	"github.com/alicebob/miniredis/v2"
+	"github.com/pkg/errors"
+)
+
+type cache struct {
+	rdb *miniredis.Miniredis
+}
+
+func NewCache() (*cache, error) {
+	rdb, err := miniredis.Run()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	return &cache{
+		rdb: rdb,
+	}, nil
+}
+
+func (c *cache) Del(ctx context.Context, keys ...string) (affected int64, err error) {
+	for _, key := range keys {
+		if c.rdb.Del(key) {
+			affected++
+		}
+	}
+	return affected, nil
+}
+
+func (c *cache) Get(ctx context.Context, key string) (val []byte, err error) {
+	data, err := c.rdb.Get(key)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	return []byte(data), nil
+}
+
+func (c *cache) GetAsUint64(ctx context.Context, key string) (val uint64, err error) {
+	data, err := c.rdb.Get(key)
+	if err != nil {
+		return 0, errors.WithStack(err)
+	}
+	return strconv.ParseUint(data, 10, 64)
+}
+func (c *cache) Set(ctx context.Context, key string, val []byte, expire time.Duration) (err error) {
+	if err = c.rdb.Set(key, string(val)); err != nil {
+		return errors.WithStack(err)
+	}
+	c.rdb.SetTTL(key, expire)
+	return nil
+}
+func (c *cache) IsKeyNotFound(err error) bool {
+	return errors.Is(err, miniredis.ErrKeyNotFound)
+}