feat: add data loader framework (#2371)

Author: bzp2010

api/internal/handler/data_loader/loader/loader.go

@@ -0,0 +1,44 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 loader
+
+import "github.com/apisix/manager-api/internal/core/entity"
+
+// DataSets are intermediate structures used to handle
+// import and export data with APISIX entities.
+// On import, raw data will be parsed as DataSets
+// On export, DataSets will be encoded to raw data
+type DataSets struct {
+	Routes        []entity.Route
+	Upstreams     []entity.Upstream
+	Services      []entity.Service
+	Consumers     []entity.Consumer
+	SSLs          []entity.SSL
+	StreamRoutes  []entity.StreamRoute
+	GlobalPlugins []entity.GlobalPlugins
+	PluginConfigs []entity.PluginConfig
+	Protos        []entity.Proto
+}
+
+// Loader provide data loader abstraction
+type Loader interface {
+	// Import accepts data and converts it into entity data sets
+	Import(input interface{}) (*DataSets, error)
+
+	// Export accepts entity data sets and converts it into a specific format
+	Export(data DataSets) (interface{}, error)
+}