192 lines
5.7 KiB
Go
192 lines
5.7 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016 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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"context"
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"sort"
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)
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// Returns function "listDir" of the type listDirFunc.
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// isLeaf - is used by listDir function to check if an entry is a leaf or non-leaf entry.
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// disks - used for doing disk.ListDir()
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func listDirFactory(ctx context.Context, isLeaf isLeafFunc, disks ...StorageAPI) listDirFunc {
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// Returns sorted merged entries from all the disks.
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listDir := func(bucket, prefixDir, prefixEntry string) (mergedEntries []string, delayIsLeaf bool) {
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for _, disk := range disks {
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if disk == nil {
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continue
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}
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var entries []string
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var newEntries []string
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var err error
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entries, err = disk.ListDir(bucket, prefixDir, -1)
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if err != nil {
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continue
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}
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// Find elements in entries which are not in mergedEntries
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for _, entry := range entries {
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idx := sort.SearchStrings(mergedEntries, entry)
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// if entry is already present in mergedEntries don't add.
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if idx < len(mergedEntries) && mergedEntries[idx] == entry {
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continue
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}
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newEntries = append(newEntries, entry)
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}
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if len(newEntries) > 0 {
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// Merge the entries and sort it.
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mergedEntries = append(mergedEntries, newEntries...)
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sort.Strings(mergedEntries)
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}
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}
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mergedEntries, delayIsLeaf = filterListEntries(bucket, prefixDir, mergedEntries, prefixEntry, isLeaf)
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return mergedEntries, delayIsLeaf
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}
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return listDir
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}
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// listObjects - wrapper function implemented over file tree walk.
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func (xl xlObjects) listObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (loi ListObjectsInfo, e error) {
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// Default is recursive, if delimiter is set then list non recursive.
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recursive := true
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if delimiter == slashSeparator {
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recursive = false
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}
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walkResultCh, endWalkCh := xl.listPool.Release(listParams{bucket, recursive, marker, prefix})
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if walkResultCh == nil {
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endWalkCh = make(chan struct{})
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isLeaf := xl.isObject
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isLeafDir := xl.isObjectDir
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listDir := listDirFactory(ctx, isLeaf, xl.getLoadBalancedDisks()...)
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walkResultCh = startTreeWalk(ctx, bucket, prefix, marker, recursive, listDir, isLeaf, isLeafDir, endWalkCh)
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}
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var objInfos []ObjectInfo
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var eof bool
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var nextMarker string
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for i := 0; i < maxKeys; {
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walkResult, ok := <-walkResultCh
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if !ok {
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// Closed channel.
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eof = true
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break
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}
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// For any walk error return right away.
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if walkResult.err != nil {
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return loi, toObjectErr(walkResult.err, bucket, prefix)
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}
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entry := walkResult.entry
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var objInfo ObjectInfo
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if hasSuffix(entry, slashSeparator) {
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// Object name needs to be full path.
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objInfo.Bucket = bucket
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objInfo.Name = entry
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objInfo.IsDir = true
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} else {
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// Set the Mode to a "regular" file.
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var err error
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objInfo, err = xl.getObjectInfo(ctx, bucket, entry)
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if err != nil {
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// Ignore errFileNotFound as the object might have got
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// deleted in the interim period of listing and getObjectInfo(),
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// ignore quorum error as it might be an entry from an outdated disk.
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switch err {
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case errFileNotFound, errXLReadQuorum:
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continue
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}
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return loi, toObjectErr(err, bucket, prefix)
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}
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}
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nextMarker = objInfo.Name
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objInfos = append(objInfos, objInfo)
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i++
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if walkResult.end {
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eof = true
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break
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}
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}
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params := listParams{bucket, recursive, nextMarker, prefix}
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if !eof {
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xl.listPool.Set(params, walkResultCh, endWalkCh)
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}
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result := ListObjectsInfo{}
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for _, objInfo := range objInfos {
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if objInfo.IsDir && delimiter == slashSeparator {
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result.Prefixes = append(result.Prefixes, objInfo.Name)
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continue
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}
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result.Objects = append(result.Objects, objInfo)
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}
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if !eof {
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result.IsTruncated = true
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if len(objInfos) > 0 {
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result.NextMarker = objInfos[len(objInfos)-1].Name
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}
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}
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return result, nil
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}
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// ListObjects - list all objects at prefix, delimited by '/'.
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func (xl xlObjects) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (loi ListObjectsInfo, e error) {
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if err := checkListObjsArgs(ctx, bucket, prefix, marker, delimiter, xl); err != nil {
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return loi, err
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}
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// With max keys of zero we have reached eof, return right here.
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if maxKeys == 0 {
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return loi, nil
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}
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// Marker is set validate pre-condition.
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if marker != "" {
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// Marker not common with prefix is not implemented.Send an empty response
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if !hasPrefix(marker, prefix) {
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return ListObjectsInfo{}, e
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}
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}
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// For delimiter and prefix as '/' we do not list anything at all
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// since according to s3 spec we stop at the 'delimiter' along
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// with the prefix. On a flat namespace with 'prefix' as '/'
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// we don't have any entries, since all the keys are of form 'keyName/...'
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if delimiter == slashSeparator && prefix == slashSeparator {
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return loi, nil
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}
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// Over flowing count - reset to maxObjectList.
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if maxKeys < 0 || maxKeys > maxObjectList {
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maxKeys = maxObjectList
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}
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// Initiate a list operation, if successful filter and return quickly.
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listObjInfo, err := xl.listObjects(ctx, bucket, prefix, marker, delimiter, maxKeys)
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if err == nil {
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// We got the entries successfully return.
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return listObjInfo, nil
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}
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// Return error at the end.
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return loi, toObjectErr(err, bucket, prefix)
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}
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