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eac66e67ec
Some deployments have low parity (EC:2), but we really do not need to save our config data with the same parity configuration. N/2 would be better to keep MinIO configurations intact when unexpected a number of drives fail.
87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
/*
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* MinIO Cloud Storage, (C) 2018 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"context"
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"errors"
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"io/ioutil"
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"net/http"
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"github.com/minio/minio/pkg/hash"
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)
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var errConfigNotFound = errors.New("config file not found")
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func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) ([]byte, error) {
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// Read entire content by setting size to -1
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r, err := objAPI.GetObjectNInfo(ctx, minioMetaBucket, configFile, nil, http.Header{}, readLock, ObjectOptions{})
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if err != nil {
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// Treat object not found as config not found.
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if isErrObjectNotFound(err) {
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return nil, errConfigNotFound
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}
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return nil, err
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}
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defer r.Close()
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buf, err := ioutil.ReadAll(r)
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if err != nil {
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return nil, err
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}
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if len(buf) == 0 {
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return nil, errConfigNotFound
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}
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return buf, nil
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}
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type objectDeleter interface {
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DeleteObject(ctx context.Context, bucket, object string, opts ObjectOptions) (ObjectInfo, error)
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}
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func deleteConfig(ctx context.Context, objAPI objectDeleter, configFile string) error {
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_, err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile, ObjectOptions{})
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if err != nil && isErrObjectNotFound(err) {
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return errConfigNotFound
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}
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return err
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}
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func saveConfig(ctx context.Context, objAPI ObjectLayer, configFile string, data []byte) error {
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hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
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if err != nil {
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return err
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}
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_, err = objAPI.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader), ObjectOptions{MaxParity: true})
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return err
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}
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func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
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if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
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// Treat object not found as config not found.
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if isErrObjectNotFound(err) {
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return errConfigNotFound
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}
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return err
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}
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return nil
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}
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