minio/xl-v1-list-objects.go

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package main
import "strings"
func (xl xlObjects) listObjectsXL(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
}
walker := xl.lookupTreeWalkXL(listParams{bucket, recursive, marker, prefix})
if walker == nil {
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walker = xl.startTreeWalkXL(bucket, prefix, marker, recursive, xl.isObject)
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}
var objInfos []ObjectInfo
var eof bool
var nextMarker string
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 {
// File not found is a valid case.
if walkResult.err == errFileNotFound {
return ListObjectsInfo{}, nil
}
return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
}
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entry := walkResult.entry
var objInfo ObjectInfo
if strings.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 {
return ListObjectsInfo{}, toObjectErr(err, bucket, prefix)
}
}
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nextMarker = objInfo.Name
objInfos = append(objInfos, objInfo)
if walkResult.end {
eof = true
break
}
i++
}
params := listParams{bucket, recursive, nextMarker, prefix}
if !eof {
xl.saveTreeWalkXL(params, walker)
}
result := ListObjectsInfo{IsTruncated: !eof}
for _, objInfo := range objInfos {
// With delimiter set we fill in NextMarker and Prefixes.
if delimiter == slashSeparator {
result.NextMarker = objInfo.Name
if objInfo.IsDir {
result.Prefixes = append(result.Prefixes, objInfo.Name)
continue
}
}
result.Objects = append(result.Objects, ObjectInfo{
Name: objInfo.Name,
ModTime: objInfo.ModTime,
Size: objInfo.Size,
IsDir: false,
})
}
return result, nil
}
// ListObjects - list all objects at prefix, delimited by '/'.
func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
}
// Verify if bucket exists.
if !xl.isBucketExist(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,
}
}
}
// With max keys of zero we have reached eof, return right here.
if maxKeys == 0 {
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.listObjectsXL(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)
}