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minio/fs-bucket-listobjects.go

182 lines
5.2 KiB

/*
* Minio Cloud Storage, (C) 2015-2016 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 (
"fmt"
"os"
"path/filepath"
"strings"
"github.com/minio/minio/pkg/probe"
)
const (
// listObjectsLimit - maximum list objects limit.
listObjectsLimit = 1000
)
// isDirExist - returns whether given directory is exist or not.
func isDirExist(dirname string) (bool, error) {
fi, e := os.Lstat(dirname)
if e != nil {
if os.IsNotExist(e) {
return false, nil
}
return false, e
}
return fi.IsDir(), nil
}
func (fs *Filesystem) saveTreeWalk(params listObjectParams, walker *treeWalker) {
fs.listObjectMapMutex.Lock()
defer fs.listObjectMapMutex.Unlock()
walkers, _ := fs.listObjectMap[params]
walkers = append(walkers, walker)
fs.listObjectMap[params] = walkers
}
func (fs *Filesystem) lookupTreeWalk(params listObjectParams) *treeWalker {
fs.listObjectMapMutex.Lock()
defer fs.listObjectMapMutex.Unlock()
if walkChs, ok := fs.listObjectMap[params]; ok {
for i, walkCh := range walkChs {
if !walkCh.timedOut {
newWalkChs := walkChs[i+1:]
if len(newWalkChs) > 0 {
fs.listObjectMap[params] = newWalkChs
} else {
delete(fs.listObjectMap, params)
}
return walkCh
}
}
// As all channels are timed out, delete the map entry
delete(fs.listObjectMap, params)
}
return nil
}
// ListObjects - lists all objects for a given prefix, returns up to
// maxKeys number of objects per call.
func (fs Filesystem) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, *probe.Error) {
result := ListObjectsInfo{}
// Input validation.
bucket, e := fs.checkBucketArg(bucket)
if e != nil {
return result, probe.NewError(e)
}
bucketDir := filepath.Join(fs.diskPath, bucket)
if !IsValidObjectPrefix(prefix) {
return result, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
}
// Verify if delimiter is anything other than '/', which we do not support.
if delimiter != "" && delimiter != "/" {
return result, probe.NewError(fmt.Errorf("delimiter '%s' is not supported. Only '/' is supported", delimiter))
}
// Verify if marker has prefix.
if marker != "" {
if !strings.HasPrefix(marker, prefix) {
return result, probe.NewError(fmt.Errorf("Invalid combination of marker '%s' and prefix '%s'", marker, prefix))
}
}
// Return empty response for a valid request when maxKeys is 0.
if maxKeys == 0 {
return result, nil
}
// Over flowing maxkeys - reset to listObjectsLimit.
if maxKeys < 0 || maxKeys > listObjectsLimit {
maxKeys = listObjectsLimit
}
// Verify if prefix exists.
prefixDir := filepath.Dir(filepath.FromSlash(prefix))
rootDir := filepath.Join(bucketDir, prefixDir)
if status, e := isDirExist(rootDir); !status {
if e == nil {
// Prefix does not exist, not an error just respond empty
// list response.
return result, nil
}
// Rest errors should be treated as failure.
return result, probe.NewError(e)
}
recursive := true
if delimiter == "/" {
recursive = false
}
// Maximum 1000 objects returned in a single to listObjects.
// Further calls will set right marker value to continue reading the rest of the objectList.
// popTreeWalker returns nil if the call to ListObject is done for the first time.
// On further calls to ListObjects to retrive more objects within the timeout period,
// popTreeWalker returns the channel from which rest of the objects can be retrieved.
walker := fs.lookupTreeWalk(listObjectParams{bucket, delimiter, marker, prefix})
if walker == nil {
walker = startTreeWalk(fs.diskPath, bucket, filepath.FromSlash(prefix), filepath.FromSlash(marker), recursive)
}
nextMarker := ""
for i := 0; i < maxKeys; {
walkResult, ok := <-walker.ch
if !ok {
// Closed channel.
return result, nil
}
// For any walk error return right away.
if walkResult.err != nil {
return ListObjectsInfo{}, probe.NewError(walkResult.err)
}
objInfo := walkResult.objectInfo
objInfo.Name = filepath.ToSlash(objInfo.Name)
// Skip temporary files.
if strings.Contains(objInfo.Name, "$multiparts") || strings.Contains(objInfo.Name, "$tmpobject") {
continue
}
// For objects being directory and delimited we set Prefixes.
if objInfo.IsDir {
result.Prefixes = append(result.Prefixes, objInfo.Name)
} else {
result.Objects = append(result.Objects, objInfo)
}
// We have listed everything return.
if walkResult.end {
return result, nil
}
nextMarker = objInfo.Name
i++
}
// We haven't exhaused the list yet, set IsTruncated to 'true' so
// that the client can send another request.
result.IsTruncated = true
result.NextMarker = nextMarker
fs.saveTreeWalk(listObjectParams{bucket, delimiter, nextMarker, prefix}, walker)
return result, nil
}