API: List ARNs (#19)

* API: List ARNs

* Add Tests

restapi/admin_arns.go

@@ -0,0 +1,75 @@
+// This file is part of MinIO Console Server
+// Copyright (c) 2020 MinIO, Inc.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package restapi
+
+import (
+	"context"
+	"log"
+	"time"
+
+	"github.com/go-openapi/runtime/middleware"
+	"github.com/go-openapi/swag"
+	"github.com/minio/m3/mcs/models"
+	"github.com/minio/m3/mcs/restapi/operations"
+	"github.com/minio/m3/mcs/restapi/operations/admin_api"
+)
+
+func registerAdminArnsHandlers(api *operations.McsAPI) {
+	// return a list of arns
+	api.AdminAPIArnListHandler = admin_api.ArnListHandlerFunc(func(params admin_api.ArnListParams, principal *models.Principal) middleware.Responder {
+		arnsResp, err := getArnsResponse()
+		if err != nil {
+			return admin_api.NewArnListDefault(500).WithPayload(&models.Error{Code: 500, Message: swag.String(err.Error())})
+		}
+		return admin_api.NewArnListOK().WithPayload(arnsResp)
+	})
+
+}
+
+// getArns invokes admin info and returns a list of arns
+func getArns(ctx context.Context, client MinioAdmin) (*models.ArnsResponse, error) {
+	serverInfo, err := client.serverInfo(ctx)
+	if err != nil {
+		return nil, err
+	}
+	// build response
+	return &models.ArnsResponse{
+		Arns: serverInfo.SQSARN,
+	}, nil
+}
+
+// getArnsResponse returns a list of active arns in the instance
+func getArnsResponse() (*models.ArnsResponse, error) {
+	mAdmin, err := newMAdminClient()
+	if err != nil {
+		log.Println("error creating Madmin Client:", err)
+		return nil, err
+	}
+	// create a minioClient interface implementation
+	// defining the client to be used
+	adminClient := adminClient{client: mAdmin}
+	// 20 seconds timeout
+	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+	defer cancel()
+	// serialize output
+	arnsList, err := getArns(ctx, adminClient)
+	if err != nil {
+		log.Println("error getting arn list:", err)
+		return nil, err
+	}
+	return arnsList, nil
+}