Optimized List objects v2 for metadata (#1175)

Signed-off-by: Daniel Valdivia <18384552+dvaldivia@users.noreply.github.com>

restapi/user_bucket_quota.go

@@ -96,9 +96,6 @@ func setBucketQuota(ctx context.Context, ac *AdminClient, bucket *string, bucket
 }
 
 func getBucketQuotaResponse(session *models.Principal, params user_api.GetBucketQuotaParams) (*models.BucketQuota, *models.Error) {
-	if !isErasureBackend() {
-		return &models.BucketQuota{}, nil
-	}
 
 	mAdmin, err := NewMinioAdminClient(session)
 	if err != nil {

restapi/user_buckets.go

@@ -22,10 +22,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
-	"sync"
 	"time"
 
-	"github.com/minio/madmin-go"
 	"github.com/minio/mc/cmd"
 	"github.com/minio/mc/pkg/probe"
 	"github.com/minio/minio-go/v7"
@@ -202,10 +200,6 @@ func setBucketVersioningResponse(session *models.Principal, bucketName string, p
 }
 
 func getBucketReplicationResponse(session *models.Principal, bucketName string) (*models.BucketReplicationResponse, error) {
-	if !isErasureBackend() {
-		return &models.BucketReplicationResponse{}, nil
-	}
-
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
 	defer cancel()
 
@@ -256,12 +250,6 @@ func getBucketReplicationResponse(session *models.Principal, bucketName string)
 }
 
 func getBucketVersionedResponse(session *models.Principal, bucketName string) (*models.BucketVersioningResponse, error) {
-	if !isErasureBackend() {
-		return &models.BucketVersioningResponse{
-			IsVersioned: false,
-		}, nil
-	}
-
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
 	defer cancel()
 
@@ -288,13 +276,6 @@ func getBucketVersionedResponse(session *models.Principal, bucketName string) (*
 	return bucketVResponse, nil
 }
 
-var serverBackendType madmin.BackendType
-var serverBackendOnce sync.Once
-
-func isErasureBackend() bool {
-	return serverBackendType == madmin.Erasure
-}
-
 // getAccountInfo fetches a list of all buckets allowed to that particular client from MinIO Servers
 func getAccountInfo(ctx context.Context, client MinioAdmin) ([]*models.Bucket, error) {
 	info, err := client.AccountInfo(ctx)
@@ -302,10 +283,6 @@ func getAccountInfo(ctx context.Context, client MinioAdmin) ([]*models.Bucket, e
 		return []*models.Bucket{}, err
 	}
 
-	serverBackendOnce.Do(func() {
-		serverBackendType = info.Server.Type
-	})
-
 	var bucketInfos []*models.Bucket
 	for _, bucket := range info.Buckets {
 

restapi/user_objects.go

@@ -197,7 +197,7 @@ func getListObjectsResponse(session *models.Principal, params user_api.ListObjec
 	if params.Recursive != nil {
 		recursive = *params.Recursive
 	}
-	if isErasureBackend() && params.WithVersions != nil {
+	if params.WithVersions != nil {
 		withVersions = *params.WithVersions
 	}
 	if params.WithMetadata != nil {
@@ -230,7 +230,16 @@ func getListObjectsResponse(session *models.Principal, params user_api.ListObjec
 // listBucketObjects gets an array of objects in a bucket
 func listBucketObjects(ctx context.Context, client MinioClient, bucketName string, prefix string, recursive, withVersions bool, withMetadata bool) ([]*models.BucketObject, error) {
 	var objects []*models.BucketObject
-	for lsObj := range client.listObjects(ctx, bucketName, minio.ListObjectsOptions{Prefix: prefix, Recursive: recursive, WithVersions: withVersions, WithMetadata: withMetadata}) {
+	opts := minio.ListObjectsOptions{
+		Prefix:       prefix,
+		Recursive:    recursive,
+		WithVersions: withVersions,
+		WithMetadata: withMetadata,
+	}
+	if withMetadata {
+		opts.MaxKeys = 1
+	}
+	for lsObj := range client.listObjects(ctx, bucketName, opts) {
 		if lsObj.Err != nil {
 			return nil, lsObj.Err
 		}