feat: add getset command in redis and kv

core/stores/kv/store.go

@@ -54,6 +54,7 @@ type (
 		Setex(key, value string, seconds int) error
 		Setnx(key, value string) (bool, error)
 		SetnxEx(key, value string, seconds int) (bool, error)
+		Getset(key, value string) (string, error)
 		Sismember(key string, value interface{}) (bool, error)
 		Smembers(key string) ([]string, error)
 		Spop(key string) (string, error)
@@ -459,6 +460,15 @@ func (cs clusterStore) SetnxEx(key, value string, seconds int) (bool, error) {
 	return node.SetnxEx(key, value, seconds)
 }
 
+func (cs clusterStore) Getset(key, value string) (string, error) {
+	node, err := cs.getRedis(key)
+	if err != nil {
+		return "", err
+	}
+
+	return node.GetSet(key, value)
+}
+
 func (cs clusterStore) Sismember(key string, value interface{}) (bool, error) {
 	node, err := cs.getRedis(key)
 	if err != nil {

core/stores/kv/store_test.go

@@ -490,6 +490,29 @@ func TestRedis_SetExNx(t *testing.T) {
 	})
 }
 
+func TestRedis_Getset(t *testing.T) {
+	store := clusterStore{dispatcher: hash.NewConsistentHash()}
+	_, err := store.Getset("hello", "world")
+	assert.NotNil(t, err)
+
+	runOnCluster(t, func(client Store) {
+		val, err := client.Getset("hello", "world")
+		assert.Nil(t, err)
+		assert.Equal(t, "", val)
+		val, err = client.Get("hello")
+		assert.Nil(t, err)
+		assert.Equal(t, "world", val)
+		val, err = client.Getset("hello", "newworld")
+		assert.Nil(t, err)
+		assert.Equal(t, "world", val)
+		val, err = client.Get("hello")
+		assert.Nil(t, err)
+		assert.Equal(t, "newworld", val)
+		_, err = client.Del("hello")
+		assert.Nil(t, err)
+	})
+}
+
 func TestRedis_SetGetDelHashField(t *testing.T) {
 	store := clusterStore{dispatcher: hash.NewConsistentHash()}
 	err := store.Hset("key", "field", "value")

core/stores/redis/redis.go

@@ -615,6 +615,31 @@ func (s *Redis) GetCtx(ctx context.Context, key string) (val string, err error)
 	return
 }
 
+// GetSet is the implementation of redis getset command.
+func (s *Redis) GetSet(key, value string) (string, error) {
+	return s.GetSetCtx(context.Background(), key, value)
+}
+
+// GetSetCtx is the implementation of redis getset command.
+func (s *Redis) GetSetCtx(ctx context.Context, key, value string) (val string, err error) {
+	err = s.brk.DoWithAcceptable(func() error {
+		conn, err := getRedis(s)
+		if err != nil {
+			return err
+		}
+
+		if val, err = conn.GetSet(ctx, key, value).Result(); err == red.Nil {
+			return nil
+		} else if err != nil {
+			return err
+		} else {
+			return nil
+		}
+	}, acceptable)
+
+	return
+}
+
 // GetBit is the implementation of redis getbit command.
 func (s *Redis) GetBit(key string, offset int64) (int, error) {
 	return s.GetBitCtx(context.Background(), key, offset)

core/stores/redis/redis_test.go

@@ -701,6 +701,28 @@ func TestRedis_Set(t *testing.T) {
 	})
 }
 
+func TestRedis_GetSet(t *testing.T) {
+	runOnRedis(t, func(client *Redis) {
+		val, err := New(client.Addr, badType()).GetSet("hello", "world")
+		assert.NotNil(t, err)
+		val, err = client.GetSet("hello", "world")
+		assert.Nil(t, err)
+		assert.Equal(t, "", val)
+		val, err = client.Get("hello")
+		assert.Nil(t, err)
+		assert.Equal(t, "world", val)
+		val, err = client.GetSet("hello", "newworld")
+		assert.Nil(t, err)
+		assert.Equal(t, "world", val)
+		val, err = client.Get("hello")
+		assert.Nil(t, err)
+		assert.Equal(t, "newworld", val)
+		ret, err := client.Del("hello")
+		assert.Nil(t, err)
+		assert.Equal(t, 1, ret)
+	})
+}
+
 func TestRedis_SetGetDel(t *testing.T) {
 	runOnRedis(t, func(client *Redis) {
 		err := New(client.Addr, badType()).Set("hello", "world")