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minio/cmd/xl-v1-list-objects.go

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