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

158 lines
5.0 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
// 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(). FS passes single disk argument, XL passes a list of disks.
func listDirFactory(isLeaf isLeafFunc, treeWalkIgnoredErrs []error, disks ...StorageAPI) listDirFunc {
// listDir - lists all the entries at a given prefix and given entry in the prefix.
listDir := func(bucket, prefixDir, prefixEntry string) (entries []string, delayIsLeaf bool, err error) {
for _, disk := range disks {
if disk == nil {
continue
}
entries, err = disk.ListDir(bucket, prefixDir)
if err != nil {
// For any reason disk was deleted or goes offline, continue
// and list from other disks if possible.
if isErrIgnored(err, treeWalkIgnoredErrs...) {
continue
}
return nil, false, traceError(err)
}
entries, delayIsLeaf = filterListEntries(bucket, prefixDir, entries, prefixEntry, isLeaf)
return entries, delayIsLeaf, nil
}
// Nothing found in all disks
return nil, false, nil
}
return listDir
}
// listObjects - wrapper function implemented over file tree walk.
func (xl xlObjects) listObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
// Default is recursive, if delimiter is set then list non recursive.
recursive := true
if delimiter == slashSeparator {
recursive = false
}
heal := false // true only for xl.ListObjectsHeal
walkResultCh, endWalkCh := xl.listPool.Release(listParams{bucket, recursive, marker, prefix, heal})
if walkResultCh == nil {
endWalkCh = make(chan struct{})
isLeaf := xl.isObject
listDir := listDirFactory(isLeaf, xlTreeWalkIgnoredErrs, xl.getLoadBalancedDisks()...)
walkResultCh = startTreeWalk(bucket, prefix, marker, recursive, listDir, isLeaf, 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 ListObjectsInfo{}, 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(bucket, entry)
if err != nil {
// Ignore errFileNotFound
if errorCause(err) == errFileNotFound {
continue
}
return ListObjectsInfo{}, toObjectErr(err, bucket, prefix)
}
}
nextMarker = objInfo.Name
objInfos = append(objInfos, objInfo)
i++
if walkResult.end {
eof = true
break
}
}
params := listParams{bucket, recursive, nextMarker, prefix, heal}
if !eof {
xl.listPool.Set(params, walkResultCh, endWalkCh)
}
result := ListObjectsInfo{IsTruncated: !eof}
for _, objInfo := range objInfos {
result.NextMarker = objInfo.Name
if objInfo.IsDir {
result.Prefixes = append(result.Prefixes, objInfo.Name)
continue
}
result.Objects = append(result.Objects, objInfo)
}
return result, nil
}
// ListObjects - list all objects at prefix, delimited by '/'.
func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
if err := checkListObjsArgs(bucket, prefix, marker, delimiter, xl); err != nil {
return ListObjectsInfo{}, err
}
// With max keys of zero we have reached eof, return right here.
if maxKeys == 0 {
return ListObjectsInfo{}, nil
}
// 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 ListObjectsInfo{}, 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(bucket, prefix, marker, delimiter, maxKeys)
if err == nil {
// We got the entries successfully return.
return listObjInfo, nil
}
// Return error at the end.
return ListObjectsInfo{}, toObjectErr(err, bucket, prefix)
}