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Copy pathobject-common.go
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358 lines (331 loc) · 9.64 KB
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/*
* 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 (
"crypto/md5"
"encoding/hex"
"io"
"path"
"sort"
"strings"
"github.com/Sirupsen/logrus"
)
// Common initialization needed for both object layers.
func initObjectLayer(storage StorageAPI) error {
// 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)
}
}
// Cleanup all temp entries upon start.
err := cleanupDir(storage, minioMetaBucket, tmpMetaPrefix)
if err != nil {
return toObjectErr(err, minioMetaBucket, tmpMetaPrefix)
}
return 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 !strings.HasSuffix(entryPath, slashSeparator) {
// No trailing "/" means that this is a file which can be deleted.
return storage.DeleteFile(volume, entryPath)
}
// If it's a directory, list and call delFunc() for each entry.
entries, err := storage.ListDir(volume, entryPath)
if err != nil {
// if dirPath prefix never existed.
return nil
}
return err
}
for _, entry := range entries {
err = delFunc(pathJoin(entryPath, entry))
if err != nil {
return err
}
}
return nil
}
return delFunc(retainSlash(pathJoin(dirPath)))
}
/// 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)
}
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, bucket)
}
return nil
}
// putObjectCommon - create an object, is a common function for both object layers.
func putObjectCommon(storage StorageAPI, bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Check whether the bucket exists.
if !isBucketExist(storage, bucket) {
return "", BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{
Bucket: bucket,
Object: object,
}
}
tempObj := path.Join(tmpMetaPrefix, bucket, object)
fileWriter, err := storage.CreateFile(minioMetaBucket, tempObj)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, fileWriter)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, err = io.CopyN(multiWriter, data, size); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
} else {
if _, err = io.Copy(multiWriter, data); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
// md5Hex representation.
var md5Hex string
if len(metadata) != 0 {
md5Hex = metadata["md5Sum"]
}
if md5Hex != "" {
if newMD5Hex != md5Hex {
if err = safeCloseAndRemove(fileWriter); err != nil {
return "", err
}
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
err = storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
if err != nil {
if derr := storage.DeleteFile(minioMetaBucket, tempObj); derr != nil {
return "", derr
}
return "", toObjectErr(err, bucket, object)
}
// Return md5sum, successfully wrote object.
return newMD5Hex, nil
}
func listObjectsCommon(layer ObjectLayer, bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
var storage StorageAPI
switch l := layer.(type) {
case xlObjects:
storage = l.storage
case fsObjects:
storage = l.storage
}
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !isBucketExist(storage, bucket) {
return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
}
if !IsValidObjectPrefix(prefix) {
return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
}
// Verify if delimiter is anything other than '/', which we do not support.
if delimiter != "" && delimiter != slashSeparator {
return ListObjectsInfo{}, UnsupportedDelimiter{
Delimiter: delimiter,
}
}
// Verify if marker has prefix.
if marker != "" {
if !strings.HasPrefix(marker, prefix) {
return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
Marker: marker,
Prefix: prefix,
}
}
}
if maxKeys == 0 {
return ListObjectsInfo{}, nil
}
// Over flowing count - reset to maxObjectList.
if maxKeys < 0 || maxKeys > maxObjectList {
maxKeys = maxObjectList
}
// Default is recursive, if delimiter is set then list non recursive.
recursive := true
if delimiter == slashSeparator {
recursive = false
}
walker := lookupTreeWalk(layer, listParams{bucket, recursive, marker, prefix})
if walker == nil {
walker = startTreeWalk(layer, bucket, prefix, marker, recursive)
}
var fileInfos []FileInfo
var eof bool
var nextMarker string
log.Debugf("Reading from the tree walk channel has begun.")
for i := 0; i < maxKeys; {
walkResult, ok := <-walker.ch
if !ok {
// Closed channel.
eof = true
break
}
// For any walk error return right away.
if walkResult.err != nil {
log.WithFields(logrus.Fields{
"bucket": bucket,
"prefix": prefix,
"marker": marker,
"recursive": recursive,
}).Debugf("Walk resulted in an error %s", walkResult.err)
// File not found is a valid case.
if walkResult.err == errFileNotFound {
return ListObjectsInfo{}, nil
}
return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
}
fileInfo := walkResult.fileInfo
nextMarker = fileInfo.Name
fileInfos = append(fileInfos, fileInfo)
if walkResult.end {
eof = true
break
}
i++
}
params := listParams{bucket, recursive, nextMarker, prefix}
log.WithFields(logrus.Fields{
"bucket": params.bucket,
"recursive": params.recursive,
"marker": params.marker,
"prefix": params.prefix,
}).Debugf("Save the tree walk into map for subsequent requests.")
if !eof {
saveTreeWalk(layer, params, walker)
}
result := ListObjectsInfo{IsTruncated: !eof}
for _, fileInfo := range fileInfos {
// With delimiter set we fill in NextMarker and Prefixes.
if delimiter == slashSeparator {
result.NextMarker = fileInfo.Name
if fileInfo.Mode.IsDir() {
result.Prefixes = append(result.Prefixes, fileInfo.Name)
continue
}
}
result.Objects = append(result.Objects, ObjectInfo{
Name: fileInfo.Name,
ModTime: fileInfo.ModTime,
Size: fileInfo.Size,
IsDir: false,
})
}
return result, nil
}
// checks whether bucket exists.
func isBucketExist(storage StorageAPI, bucketName string) bool {
// Check whether bucket exists.
_, err := storage.StatVol(bucketName)
if err != nil {
if err == errVolumeNotFound {
return false
}
log.Errorf("StatVol failed with %s", err)
return false
}
return true
}