feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/infra/impl/checkpoint/mem.go

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package checkpoint
+
+import (
+	"context"
+	"sync"
+
+	"github.com/cloudwego/eino/compose"
+)
+
+type inMemoryStore struct {
+	m  map[string][]byte
+	mu sync.RWMutex
+}
+
+func (i *inMemoryStore) Get(_ context.Context, checkPointID string) ([]byte, bool, error) {
+	i.mu.RLock()
+	v, ok := i.m[checkPointID]
+	i.mu.RUnlock()
+	return v, ok, nil
+}
+
+func (i *inMemoryStore) Set(_ context.Context, checkPointID string, checkPoint []byte) error {
+	i.mu.Lock()
+	i.m[checkPointID] = checkPoint
+	i.mu.Unlock()
+	return nil
+}
+
+func NewInMemoryStore() compose.CheckPointStore {
+	return &inMemoryStore{
+		m: make(map[string][]byte),
+	}
+}

backend/infra/impl/checkpoint/redis.go

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package checkpoint
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/cloudwego/eino/compose"
+	"github.com/redis/go-redis/v9"
+)
+
+type redisStore struct {
+	client *redis.Client
+}
+
+const (
+	checkpointKeyTpl = "checkpoint_key:%s"
+	checkpointExpire = 24 * 7 * 3600 * time.Second
+)
+
+func (r *redisStore) Get(ctx context.Context, checkPointID string) ([]byte, bool, error) {
+	v, err := r.client.Get(ctx, fmt.Sprintf(checkpointKeyTpl, checkPointID)).Bytes()
+	if err != nil {
+		if errors.Is(err, redis.Nil) {
+			return nil, false, nil
+		}
+		return nil, false, err
+	}
+	return v, true, nil
+}
+
+func (r *redisStore) Set(ctx context.Context, checkPointID string, checkPoint []byte) error {
+	return r.client.Set(ctx, fmt.Sprintf(checkpointKeyTpl, checkPointID), checkPoint, checkpointExpire).Err()
+}
+
+func NewRedisStore(client *redis.Client) compose.CheckPointStore {
+	return &redisStore{client: client}
+}