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minio/cmd/object-api-common.go

161 lines
4.7 KiB

/*
* Minio Cloud Storage, (C) 2016, 2017, 2018 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"context"
"path"
"sync"
humanize "github.com/dustin/go-humanize"
"github.com/minio/minio/pkg/errors"
)
const (
// Block size used for all internal operations version 1.
blockSizeV1 = 10 * humanize.MiByte
// Staging buffer read size for all internal operations version 1.
readSizeV1 = 1 * humanize.MiByte
// Buckets meta prefix.
bucketMetaPrefix = "buckets"
// ETag (hex encoded md5sum) of empty string.
emptyETag = "d41d8cd98f00b204e9800998ecf8427e"
)
// Global object layer mutex, used for safely updating object layer.
var globalObjLayerMutex *sync.RWMutex
// Global object layer, only accessed by newObjectLayerFn().
var globalObjectAPI ObjectLayer
//Global cacheObjects, only accessed by newCacheObjectsFn().
var globalCacheObjectAPI CacheObjectLayer
func init() {
// Initialize this once per server initialization.
globalObjLayerMutex = &sync.RWMutex{}
}
// Checks if the object is a directory, this logic uses
// if size == 0 and object ends with slashSeparator then
// returns true.
func isObjectDir(object string, size int64) bool {
return hasSuffix(object, slashSeparator) && size == 0
}
// Converts just bucket, object metadata into ObjectInfo datatype.
func dirObjectInfo(bucket, object string, size int64, metadata map[string]string) ObjectInfo {
// This is a special case with size as '0' and object ends with
// a slash separator, we treat it like a valid operation and
// return success.
etag := metadata["etag"]
delete(metadata, "etag")
if etag == "" {
etag = emptyETag
}
return ObjectInfo{
Bucket: bucket,
Name: object,
ModTime: UTCNow(),
ContentType: "application/octet-stream",
IsDir: true,
Size: size,
ETag: etag,
UserDefined: metadata,
}
}
func deleteBucketMetadata(bucket string, objAPI ObjectLayer) {
// Delete bucket access policy, if present - ignore any errors.
_ = removeBucketPolicy(bucket, objAPI)
// Delete notification config, if present - ignore any errors.
_ = removeNotificationConfig(objAPI, bucket)
// Delete listener config, if present - ignore any errors.
_ = removeListenerConfig(objAPI, bucket)
}
// Depending on the disk type network or local, initialize storage API.
func newStorageAPI(endpoint Endpoint) (storage StorageAPI, err error) {
if endpoint.IsLocal {
return newPosix(endpoint.Path)
}
return newStorageRPC(endpoint), nil
}
// Cleanup a directory recursively.
func cleanupDir(storage StorageAPI, volume, dirPath string) error {
var delFunc func(string) error
// Function to delete entries recursively.
delFunc = func(entryPath string) error {
if !hasSuffix(entryPath, slashSeparator) {
// Delete the file entry.
return errors.Trace(storage.DeleteFile(volume, entryPath))
}
// If it's a directory, list and call delFunc() for each entry.
entries, err := storage.ListDir(volume, entryPath)
// If entryPath prefix never existed, safe to ignore.
if err == errFileNotFound {
return nil
} else if err != nil { // For any other errors fail.
return errors.Trace(err)
} // else on success..
// Entry path is empty, just delete it.
if len(entries) == 0 {
return errors.Trace(storage.DeleteFile(volume, path.Clean(entryPath)))
}
// Recurse and delete all other entries.
for _, entry := range entries {
if err = delFunc(pathJoin(entryPath, entry)); err != nil {
return err
}
}
return nil
}
err := delFunc(retainSlash(pathJoin(dirPath)))
return err
}
// Removes notification.xml for a given bucket, only used during DeleteBucket.
func removeNotificationConfig(objAPI ObjectLayer, bucket string) error {
// Verify bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
ncPath := path.Join(bucketConfigPrefix, bucket, bucketNotificationConfig)
return objAPI.DeleteObject(context.Background(), minioMetaBucket, ncPath)
}
// Remove listener configuration from storage layer. Used when a bucket is deleted.
func removeListenerConfig(objAPI ObjectLayer, bucket string) error {
// make the path
lcPath := path.Join(bucketConfigPrefix, bucket, bucketListenerConfig)
return objAPI.DeleteObject(context.Background(), minioMetaBucket, lcPath)
}