support mapping style endpoint config

Signed-off-by: gaort <rutong.grt@alibaba-inc.com>

sdk/endpoints/mapping_resolver.go

@@ -0,0 +1,38 @@
+/*
+ * 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 endpoints
+
+import (
+	"fmt"
+	"strings"
+)
+
+const keyFormatter = "%s::%s"
+var endpointMapping = make(map[string]string )
+
+func AddEndpointMapping(regionId, productId, endpoint string) (err error) {
+	key := fmt.Sprintf(keyFormatter, strings.ToLower(regionId), strings.ToLower(productId))
+	endpointMapping[key] = endpoint
+	return nil
+}
+
+type MappingResolver struct {
+}
+
+func (resolver *MappingResolver) TryResolve(param *ResolveParam) (endpoint string, support bool, err error) {
+	key := fmt.Sprintf(keyFormatter, strings.ToLower(param.RegionId), strings.ToLower(param.Product))
+	endpoint, contains := endpointMapping[key]
+	return endpoint, contains, nil
+}

sdk/endpoints/mapping_resolver_test.go

@@ -0,0 +1,19 @@
+package endpoints
+
+import (
+	"testing"
+	"github.com/github.com/stretchr/testify/assert"
+	"fmt"
+)
+
+func TestMappingResolver_TryResolve(t *testing.T) {
+	AddEndpointMapping("cn-hangzhou", "Ecs", "unreachable.aliyuncs.com")
+	resolveParam := &ResolveParam{
+		RegionId:"cn-hangzhou",
+		Product:"ecs",
+	}
+	endpoint, err := Resolve(resolveParam)
+	assert.Nil(t, err)
+	assert.Equal(t, endpoint, "unreachable.aliyuncs.com")
+	fmt.Println("finished")
+}

sdk/endpoints/resolver.go

@@ -53,6 +53,7 @@ func getAllResolvers() []Resolver {
 	once.Do(func() {
 		resolvers = []Resolver{
 			&SimpleHostResolver{},
+			&MappingResolver{},
 			&LocationResolver{},
 			&LocalRegionalResolver{},
 			&LocalGlobalResolver{},