storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/cmd/config-common.go (about)

     1  /*
     2   * MinIO Cloud Storage, (C) 2018 MinIO, Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package cmd
    18  
    19  import (
    20  	"bytes"
    21  	"context"
    22  	"errors"
    23  	"io/ioutil"
    24  	"net/http"
    25  
    26  	"storj.io/minio/pkg/hash"
    27  )
    28  
    29  var errConfigNotFound = errors.New("config file not found")
    30  
    31  func readConfig(ctx context.Context, objAPI ObjectLayer, configFile string) ([]byte, error) {
    32  	// Read entire content by setting size to -1
    33  	r, err := objAPI.GetObjectNInfo(ctx, minioMetaBucket, configFile, nil, http.Header{}, readLock, ObjectOptions{})
    34  	if err != nil {
    35  		// Treat object not found as config not found.
    36  		if isErrObjectNotFound(err) {
    37  			return nil, errConfigNotFound
    38  		}
    39  
    40  		return nil, err
    41  	}
    42  	defer r.Close()
    43  
    44  	buf, err := ioutil.ReadAll(r)
    45  	if err != nil {
    46  		return nil, err
    47  	}
    48  	if len(buf) == 0 {
    49  		return nil, errConfigNotFound
    50  	}
    51  	return buf, nil
    52  }
    53  
    54  type objectDeleter interface {
    55  	DeleteObject(ctx context.Context, bucket, object string, opts ObjectOptions) (ObjectInfo, error)
    56  }
    57  
    58  func deleteConfig(ctx context.Context, objAPI objectDeleter, configFile string) error {
    59  	_, err := objAPI.DeleteObject(ctx, minioMetaBucket, configFile, ObjectOptions{})
    60  	if err != nil && isErrObjectNotFound(err) {
    61  		return errConfigNotFound
    62  	}
    63  	return err
    64  }
    65  
    66  func saveConfig(ctx context.Context, objAPI ObjectLayer, configFile string, data []byte) error {
    67  	hashReader, err := hash.NewReader(bytes.NewReader(data), int64(len(data)), "", getSHA256Hash(data), int64(len(data)))
    68  	if err != nil {
    69  		return err
    70  	}
    71  
    72  	_, err = objAPI.PutObject(ctx, minioMetaBucket, configFile, NewPutObjReader(hashReader), ObjectOptions{MaxParity: true})
    73  	return err
    74  }
    75  
    76  func checkConfig(ctx context.Context, objAPI ObjectLayer, configFile string) error {
    77  	if _, err := objAPI.GetObjectInfo(ctx, minioMetaBucket, configFile, ObjectOptions{}); err != nil {
    78  		// Treat object not found as config not found.
    79  		if isErrObjectNotFound(err) {
    80  			return errConfigNotFound
    81  		}
    82  
    83  		return err
    84  	}
    85  	return nil
    86  }