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minio/object-common.go

127 lines
3.6 KiB

/*
* Minio Cloud Storage, (C) 2016 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 main
import (
"path"
"sort"
)
/// Common object layer functions.
// makeBucket - create a bucket, is a common function for both object layers.
func makeBucket(storage StorageAPI, bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if err := storage.MakeVol(bucket); err != nil {
return toObjectErr(err, bucket)
}
// This happens for the first time, but keep this here since this
// is the only place where it can be made expensive optimizing all
// other calls.
// Create minio meta volume, if it doesn't exist yet.
if err := storage.MakeVol(minioMetaBucket); err != nil {
if err != errVolumeExists {
return toObjectErr(err, minioMetaBucket)
}
}
return nil
}
// getBucketInfo - fetch bucket info, is a common function for both object layers.
func getBucketInfo(storage StorageAPI, bucket string) (BucketInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketInfo{}, BucketNameInvalid{Bucket: bucket}
}
vi, err := storage.StatVol(bucket)
if err != nil {
return BucketInfo{}, toObjectErr(err, bucket)
}
return BucketInfo{
Name: bucket,
Created: vi.Created,
Total: vi.Total,
Free: vi.Free,
}, nil
}
// listBuckets - list all buckets, is a common function for both object layers.
func listBuckets(storage StorageAPI) ([]BucketInfo, error) {
var bucketInfos []BucketInfo
vols, err := storage.ListVols()
if err != nil {
return nil, toObjectErr(err)
}
for _, vol := range vols {
// StorageAPI can send volume names which are incompatible
// with buckets, handle it and skip them.
if !IsValidBucketName(vol.Name) {
continue
}
bucketInfos = append(bucketInfos, BucketInfo{
Name: vol.Name,
Created: vol.Created,
Total: vol.Total,
Free: vol.Free,
})
}
sort.Sort(byBucketName(bucketInfos))
return bucketInfos, nil
}
// deleteBucket - deletes a bucket, is a common function for both the layers.
func deleteBucket(storage StorageAPI, bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if err := storage.DeleteVol(bucket); err != nil {
return toObjectErr(err)
}
return nil
}
// isUploadIDExists - verify if a given uploadID exists and is valid.
func isUploadIDExists(storage StorageAPI, bucket, object, uploadID string) (bool, error) {
uploadIDPath := path.Join(bucket, object, uploadID)
st, err := storage.StatFile(minioMetaBucket, uploadIDPath)
if err != nil {
// Upload id does not exist.
if err == errFileNotFound {
return false, nil
}
return false, err
}
// Upload id exists and is a regular file.
return st.Mode.IsRegular(), nil
}
// checks whether bucket exists.
func isBucketExist(storage StorageAPI, bucketName string) (bool, error) {
// Check whether bucket exists.
if _, e := storage.StatVol(bucketName); e != nil {
if e == errVolumeNotFound {
return false, nil
}
return false, e
}
return true, nil
}