OP#792 initial commit after fork

cmd/config-common.go

@@ -0,0 +1,97 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// 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 cmd
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"io"
+	"net/http"
+
+	"github.com/minio/minio/internal/hash"
+)
+
+var errConfigNotFound = errors.New("config file not found")
+
+func readConfigWithMetadata(ctx context.Context, store objectIO, configFile string, opts ObjectOptions) ([]byte, ObjectInfo, error) {
+	r, err := store.GetObjectNInfo(ctx, minioMetaBucket, configFile, nil, http.Header{}, opts)
+	if err != nil {
+		if isErrObjectNotFound(err) {
+			return nil, ObjectInfo{}, errConfigNotFound
+		}
+
+		return nil, ObjectInfo{}, err
+	}
+	defer r.Close()
+
+	buf, err := io.ReadAll(r)
+	if err != nil {
+		return nil, ObjectInfo{}, err
+	}
+	if len(buf) == 0 {
+		return nil, ObjectInfo{}, errConfigNotFound
+	}
+	return buf, r.ObjInfo, nil
+}
+
+func readConfig(ctx context.Context, store objectIO, configFile string) ([]byte, error) {
+	buf, _, err := readConfigWithMetadata(ctx, store, configFile, ObjectOptions{})
+	return buf, err
+}
+
+type objectDeleter interface {
+	DeleteObject(ctx context.Context, bucket, object string, opts ObjectOptions) (ObjectInfo, error)
+}
+
+func deleteConfig(ctx context.Context, objAPI objectDeleter, configFile string) error {
+	_, err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile, ObjectOptions{
+		DeletePrefix:       true,
+		DeletePrefixObject: true, // use prefix delete on exact object (this is an optimization to avoid fan-out calls)
+	})
+	if err != nil && isErrObjectNotFound(err) {
+		return errConfigNotFound
+	}
+	return err
+}
+
+func saveConfigWithOpts(ctx context.Context, store objectIO, configFile string, data []byte, opts ObjectOptions) error {
+	hashReader, err := hash.NewReader(ctx, bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
+	if err != nil {
+		return err
+	}
+
+	_, err = store.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader), opts)
+	return err
+}
+
+func saveConfig(ctx context.Context, store objectIO, configFile string, data []byte) error {
+	return saveConfigWithOpts(ctx, store, configFile, data, ObjectOptions{MaxParity: true})
+}
+
+func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
+	if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
+		// Treat object not found as config not found.
+		if isErrObjectNotFound(err) {
+			return errConfigNotFound
+		}
+
+		return err
+	}
+	return nil
+}