mirror of
https://github.com/minio/minio.git
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50b4e54a75
Make sure to skip reserved bucket names in `ListBuckets()` current code didn't skip this properly and also generalize this behavior for both XL and FS.
872 lines
26 KiB
Go
872 lines
26 KiB
Go
/*
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* Minio Cloud Storage, (C) 2016, 2017 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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"crypto/md5"
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"encoding/hex"
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"fmt"
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"hash"
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"io"
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"os"
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"path/filepath"
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"runtime"
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"sort"
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"strings"
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"syscall"
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"github.com/minio/minio/pkg/disk"
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"github.com/minio/minio/pkg/lock"
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"github.com/minio/sha256-simd"
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)
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// fsObjects - Implements fs object layer.
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type fsObjects struct {
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// Path to be exported over S3 API.
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fsPath string
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// Unique value to be used for all
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// temporary transactions.
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fsUUID string
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minFreeSpace int64
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minFreeInodes int64
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// FS rw pool.
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rwPool *fsIOPool
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// ListObjects pool management.
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listPool *treeWalkPool
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// To manage the appendRoutine go0routines
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bgAppend *backgroundAppend
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}
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// Initializes meta volume on all the fs path.
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func initMetaVolumeFS(fsPath, fsUUID string) error {
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// This happens for the first time, but keep this here since this
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// is the only place where it can be made less expensive
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// optimizing all other calls. Create minio meta volume,
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// if it doesn't exist yet.
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metaBucketPath := pathJoin(fsPath, minioMetaBucket)
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if err := mkdirAll(metaBucketPath, 0777); err != nil {
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return err
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}
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metaTmpPath := pathJoin(fsPath, minioMetaTmpBucket, fsUUID)
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if err := mkdirAll(metaTmpPath, 0777); err != nil {
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return err
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}
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metaMultipartPath := pathJoin(fsPath, minioMetaMultipartBucket)
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if err := mkdirAll(metaMultipartPath, 0777); err != nil {
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return err
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}
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// Return success here.
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return nil
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}
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// newFSObjectLayer - initialize new fs object layer.
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func newFSObjectLayer(fsPath string) (ObjectLayer, error) {
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if fsPath == "" {
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return nil, errInvalidArgument
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}
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var err error
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// Disallow relative paths, figure out absolute paths.
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fsPath, err = filepath.Abs(fsPath)
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if err != nil {
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return nil, err
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}
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fi, err := os.Stat(preparePath(fsPath))
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if err == nil {
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if !fi.IsDir() {
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return nil, syscall.ENOTDIR
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}
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}
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if os.IsNotExist(err) {
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// Disk not found create it.
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err = mkdirAll(fsPath, 0777)
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if err != nil {
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return nil, err
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}
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}
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// Assign a new UUID for FS minio mode. Each server instance
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// gets its own UUID for temporary file transaction.
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fsUUID := mustGetUUID()
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// Initialize meta volume, if volume already exists ignores it.
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if err = initMetaVolumeFS(fsPath, fsUUID); err != nil {
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return nil, fmt.Errorf("Unable to initialize '.minio.sys' meta volume, %s", err)
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}
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// Load `format.json`.
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format, err := loadFormatFS(fsPath)
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if err != nil && err != errUnformattedDisk {
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return nil, fmt.Errorf("Unable to load 'format.json', %s", err)
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}
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// If the `format.json` doesn't exist create one.
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if err == errUnformattedDisk {
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fsFormatPath := pathJoin(fsPath, minioMetaBucket, fsFormatJSONFile)
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// Initialize format.json, if already exists overwrite it.
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if serr := saveFormatFS(fsFormatPath, newFSFormatV1()); serr != nil {
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return nil, fmt.Errorf("Unable to initialize 'format.json', %s", serr)
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}
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}
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// Validate if we have the same format.
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if err == nil && format.Format != "fs" {
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return nil, fmt.Errorf("Unable to recognize backend format, Disk is not in FS format. %s", format.Format)
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}
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// Initialize fs objects.
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fs := &fsObjects{
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fsPath: fsPath,
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fsUUID: fsUUID,
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minFreeSpace: fsMinFreeSpace,
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minFreeInodes: fsMinFreeInodes,
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rwPool: &fsIOPool{
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readersMap: make(map[string]*lock.RLockedFile),
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},
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listPool: newTreeWalkPool(globalLookupTimeout),
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bgAppend: &backgroundAppend{
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infoMap: make(map[string]bgAppendPartsInfo),
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},
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}
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// Initialize and load bucket policies.
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err = initBucketPolicies(fs)
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if err != nil {
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return nil, fmt.Errorf("Unable to load all bucket policies. %s", err)
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}
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// Initialize a new event notifier.
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err = initEventNotifier(fs)
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if err != nil {
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return nil, fmt.Errorf("Unable to initialize event notification. %s", err)
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}
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// Return successfully initialized object layer.
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return fs, nil
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}
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// checkDiskFree verifies if disk path has sufficient minimum free disk space and files.
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func (fs fsObjects) checkDiskFree() (err error) {
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// We don't validate disk space or inode utilization on windows.
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// Each windows calls to 'GetVolumeInformationW' takes around 3-5seconds.
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if runtime.GOOS == globalWindowsOSName {
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return nil
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}
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var di disk.Info
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di, err = getDiskInfo(preparePath(fs.fsPath))
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if err != nil {
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return err
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}
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// Remove 5% from free space for cumulative disk space used for journalling, inodes etc.
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availableDiskSpace := float64(di.Free) * 0.95
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if int64(availableDiskSpace) <= fs.minFreeSpace {
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return errDiskFull
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}
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// Some filesystems do not implement a way to provide total inodes available, instead inodes
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// are allocated based on available disk space. For example CephFS, StoreNext CVFS, AzureFile driver.
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// Allow for the available disk to be separately validate and we will validate inodes only if
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// total inodes are provided by the underlying filesystem.
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if di.Files != 0 && di.FSType != "NFS" {
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availableFiles := int64(di.Ffree)
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if availableFiles <= fs.minFreeInodes {
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return errDiskFull
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}
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}
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// Success.
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return nil
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}
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// Should be called when process shuts down.
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func (fs fsObjects) Shutdown() error {
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// Cleanup and delete tmp uuid.
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return fsRemoveAll(pathJoin(fs.fsPath, minioMetaTmpBucket, fs.fsUUID))
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}
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// StorageInfo - returns underlying storage statistics.
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func (fs fsObjects) StorageInfo() StorageInfo {
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info, err := getDiskInfo(preparePath(fs.fsPath))
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errorIf(err, "Unable to get disk info %#v", fs.fsPath)
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storageInfo := StorageInfo{
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Total: info.Total,
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Free: info.Free,
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}
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storageInfo.Backend.Type = FS
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return storageInfo
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}
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/// Bucket operations
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// getBucketDir - will convert incoming bucket names to
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// corresponding valid bucket names on the backend in a platform
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// compatible way for all operating systems.
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func (fs fsObjects) getBucketDir(bucket string) (string, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return "", traceError(BucketNameInvalid{Bucket: bucket})
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}
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bucketDir := pathJoin(fs.fsPath, bucket)
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return bucketDir, nil
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}
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func (fs fsObjects) statBucketDir(bucket string) (os.FileInfo, error) {
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bucketDir, err := fs.getBucketDir(bucket)
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if err != nil {
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return nil, err
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}
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st, err := fsStatDir(bucketDir)
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if err != nil {
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return nil, err
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}
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return st, nil
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}
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// MakeBucket - create a new bucket, returns if it
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// already exists.
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func (fs fsObjects) MakeBucket(bucket string) error {
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bucketDir, err := fs.getBucketDir(bucket)
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if err != nil {
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return toObjectErr(err, bucket)
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}
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if err = fsMkdir(bucketDir); err != nil {
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return toObjectErr(err, bucket)
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}
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return nil
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}
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// GetBucketInfo - fetch bucket metadata info.
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func (fs fsObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
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st, err := fs.statBucketDir(bucket)
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if err != nil {
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return BucketInfo{}, toObjectErr(err, bucket)
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}
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// As os.Stat() doesn't carry other than ModTime(), use ModTime() as CreatedTime.
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createdTime := st.ModTime()
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return BucketInfo{
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Name: bucket,
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Created: createdTime,
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}, nil
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}
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// ListBuckets - list all s3 compatible buckets (directories) at fsPath.
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func (fs fsObjects) ListBuckets() ([]BucketInfo, error) {
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if err := checkPathLength(fs.fsPath); err != nil {
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return nil, traceError(err)
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}
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var bucketInfos []BucketInfo
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entries, err := readDir(preparePath(fs.fsPath))
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if err != nil {
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return nil, toObjectErr(traceError(errDiskNotFound))
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}
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for _, entry := range entries {
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// Ignore all reserved bucket names and invalid bucket names.
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if isReservedOrInvalidBucket(entry) {
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continue
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}
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var fi os.FileInfo
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fi, err = fsStatDir(pathJoin(fs.fsPath, entry))
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if err != nil {
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// If the directory does not exist, skip the entry.
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if errorCause(err) == errVolumeNotFound {
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continue
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} else if errorCause(err) == errVolumeAccessDenied {
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// Skip the entry if its a file.
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continue
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}
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return nil, err
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}
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bucketInfos = append(bucketInfos, BucketInfo{
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Name: fi.Name(),
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// As os.Stat() doesnt carry CreatedTime, use ModTime() as CreatedTime.
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Created: fi.ModTime(),
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})
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}
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// Sort bucket infos by bucket name.
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sort.Sort(byBucketName(bucketInfos))
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// Succes.
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return bucketInfos, nil
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}
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// DeleteBucket - delete a bucket and all the metadata associated
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// with the bucket including pending multipart, object metadata.
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func (fs fsObjects) DeleteBucket(bucket string) error {
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bucketDir, err := fs.getBucketDir(bucket)
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if err != nil {
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return toObjectErr(err, bucket)
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}
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// Attempt to delete regular bucket.
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if err = fsRemoveDir(bucketDir); err != nil {
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return toObjectErr(err, bucket)
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}
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// Cleanup all the previously incomplete multiparts.
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minioMetaMultipartBucketDir := pathJoin(fs.fsPath, minioMetaMultipartBucket, bucket)
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if err = fsRemoveAll(minioMetaMultipartBucketDir); err != nil {
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return toObjectErr(err, bucket)
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}
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// Cleanup all the bucket metadata.
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minioMetadataBucketDir := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket)
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if err = fsRemoveAll(minioMetadataBucketDir); err != nil {
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return toObjectErr(err, bucket)
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}
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return nil
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}
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/// Object Operations
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// CopyObject - copy object source object to destination object.
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// if source object and destination object are same we only
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// update metadata.
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func (fs fsObjects) CopyObject(srcBucket, srcObject, dstBucket, dstObject string, metadata map[string]string) (ObjectInfo, error) {
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if _, err := fs.statBucketDir(srcBucket); err != nil {
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return ObjectInfo{}, toObjectErr(err, srcBucket)
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}
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// Stat the file to get file size.
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fi, err := fsStatFile(pathJoin(fs.fsPath, srcBucket, srcObject))
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if err != nil {
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return ObjectInfo{}, toObjectErr(err, srcBucket, srcObject)
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}
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// Check if this request is only metadata update.
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cpMetadataOnly := strings.EqualFold(pathJoin(srcBucket, srcObject), pathJoin(dstBucket, dstObject))
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if cpMetadataOnly {
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fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, srcBucket, srcObject, fsMetaJSONFile)
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var wlk *lock.LockedFile
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wlk, err = fs.rwPool.Write(fsMetaPath)
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if err != nil {
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return ObjectInfo{}, toObjectErr(traceError(err), srcBucket, srcObject)
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}
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// This close will allow for locks to be synchronized on `fs.json`.
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defer wlk.Close()
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// Save objects' metadata in `fs.json`.
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fsMeta := newFSMetaV1()
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fsMeta.Meta = metadata
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if _, err = fsMeta.WriteTo(wlk); err != nil {
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return ObjectInfo{}, toObjectErr(err, srcBucket, srcObject)
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}
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// Return the new object info.
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return fsMeta.ToObjectInfo(srcBucket, srcObject, fi), nil
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}
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// Length of the file to read.
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length := fi.Size()
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// Initialize pipe.
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pipeReader, pipeWriter := io.Pipe()
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go func() {
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startOffset := int64(0) // Read the whole file.
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if gerr := fs.GetObject(srcBucket, srcObject, startOffset, length, pipeWriter); gerr != nil {
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errorIf(gerr, "Unable to read %s/%s.", srcBucket, srcObject)
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pipeWriter.CloseWithError(gerr)
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return
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}
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pipeWriter.Close() // Close writer explicitly signalling we wrote all data.
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}()
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objInfo, err := fs.PutObject(dstBucket, dstObject, length, pipeReader, metadata, "")
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if err != nil {
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return ObjectInfo{}, toObjectErr(err, dstBucket, dstObject)
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}
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// Explicitly close the reader.
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pipeReader.Close()
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return objInfo, nil
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}
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// GetObject - reads an object from the disk.
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// Supports additional parameters like offset and length
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// which are synonymous with HTTP Range requests.
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//
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// startOffset indicates the starting read location of the object.
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// length indicates the total length of the object.
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func (fs fsObjects) GetObject(bucket, object string, offset int64, length int64, writer io.Writer) (err error) {
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if err = checkGetObjArgs(bucket, object); err != nil {
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return err
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}
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if _, err = fs.statBucketDir(bucket); err != nil {
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return toObjectErr(err, bucket)
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}
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// Offset cannot be negative.
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if offset < 0 {
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return toObjectErr(traceError(errUnexpected), bucket, object)
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}
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// Writer cannot be nil.
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if writer == nil {
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return toObjectErr(traceError(errUnexpected), bucket, object)
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}
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if bucket != minioMetaBucket {
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fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
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_, err = fs.rwPool.Open(fsMetaPath)
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if err != nil && err != errFileNotFound {
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return toObjectErr(traceError(err), bucket, object)
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}
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defer fs.rwPool.Close(fsMetaPath)
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}
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// Read the object, doesn't exist returns an s3 compatible error.
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fsObjPath := pathJoin(fs.fsPath, bucket, object)
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reader, size, err := fsOpenFile(fsObjPath, offset)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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defer reader.Close()
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bufSize := int64(readSizeV1)
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if length > 0 && bufSize > length {
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bufSize = length
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}
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// For negative length we read everything.
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if length < 0 {
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length = size - offset
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}
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// Reply back invalid range if the input offset and length fall out of range.
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if offset > size || offset+length > size {
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return traceError(InvalidRange{offset, length, size})
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}
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// Allocate a staging buffer.
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buf := make([]byte, int(bufSize))
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_, err = io.CopyBuffer(writer, io.LimitReader(reader, length), buf)
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return toObjectErr(traceError(err), bucket, object)
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}
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// getObjectInfo - wrapper for reading object metadata and constructs ObjectInfo.
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func (fs fsObjects) getObjectInfo(bucket, object string) (ObjectInfo, error) {
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fsMeta := fsMetaV1{}
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fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
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// Read `fs.json` to perhaps contend with
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// parallel Put() operations.
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rlk, err := fs.rwPool.Open(fsMetaPath)
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if err == nil {
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// Read from fs metadata only if it exists.
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defer fs.rwPool.Close(fsMetaPath)
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if _, rerr := fsMeta.ReadFrom(rlk.LockedFile); rerr != nil {
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// `fs.json` can be empty due to previously failed
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// PutObject() transaction, if we arrive at such
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// a situation we just ignore and continue.
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if errorCause(rerr) != io.EOF {
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return ObjectInfo{}, toObjectErr(rerr, bucket, object)
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}
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}
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}
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// Ignore if `fs.json` is not available, this is true for pre-existing data.
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if err != nil && err != errFileNotFound {
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return ObjectInfo{}, toObjectErr(traceError(err), bucket, object)
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}
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// Stat the file to get file size.
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fi, err := fsStatFile(pathJoin(fs.fsPath, bucket, object))
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if err != nil {
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return ObjectInfo{}, toObjectErr(err, bucket, object)
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}
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return fsMeta.ToObjectInfo(bucket, object, fi), nil
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}
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// GetObjectInfo - reads object metadata and replies back ObjectInfo.
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func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
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if err := checkGetObjArgs(bucket, object); err != nil {
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return ObjectInfo{}, err
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}
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if _, err := fs.statBucketDir(bucket); err != nil {
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return ObjectInfo{}, toObjectErr(err, bucket)
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}
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return fs.getObjectInfo(bucket, object)
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}
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// PutObject - creates an object upon reading from the input stream
|
|
// until EOF, writes data directly to configured filesystem path.
|
|
// Additionally writes `fs.json` which carries the necessary metadata
|
|
// for future object operations.
|
|
func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
|
|
// This is a special case with size as '0' and object ends with
|
|
// a slash separator, we treat it like a valid operation and
|
|
// return success.
|
|
if isObjectDir(object, size) {
|
|
return dirObjectInfo(bucket, object, size, metadata), nil
|
|
}
|
|
if err = checkPutObjectArgs(bucket, object, fs); err != nil {
|
|
return ObjectInfo{}, err
|
|
}
|
|
|
|
if _, err = fs.statBucketDir(bucket); err != nil {
|
|
return ObjectInfo{}, toObjectErr(err, bucket)
|
|
}
|
|
|
|
// No metadata is set, allocate a new one.
|
|
if metadata == nil {
|
|
metadata = make(map[string]string)
|
|
}
|
|
|
|
fsMeta := newFSMetaV1()
|
|
fsMeta.Meta = metadata
|
|
|
|
var wlk *lock.LockedFile
|
|
if bucket != minioMetaBucket {
|
|
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
|
|
wlk, err = fs.rwPool.Create(fsMetaPath)
|
|
if err != nil {
|
|
return ObjectInfo{}, toObjectErr(traceError(err), bucket, object)
|
|
}
|
|
// This close will allow for locks to be synchronized on `fs.json`.
|
|
defer wlk.Close()
|
|
}
|
|
|
|
// Uploaded object will first be written to the temporary location which will eventually
|
|
// be renamed to the actual location. It is first written to the temporary location
|
|
// so that cleaning it up will be easy if the server goes down.
|
|
tempObj := mustGetUUID()
|
|
|
|
// Initialize md5 writer.
|
|
md5Writer := md5.New()
|
|
|
|
hashWriters := []io.Writer{md5Writer}
|
|
|
|
var sha256Writer hash.Hash
|
|
if sha256sum != "" {
|
|
sha256Writer = sha256.New()
|
|
hashWriters = append(hashWriters, sha256Writer)
|
|
}
|
|
multiWriter := io.MultiWriter(hashWriters...)
|
|
|
|
// Limit the reader to its provided size if specified.
|
|
var limitDataReader io.Reader
|
|
if size > 0 {
|
|
// This is done so that we can avoid erroneous clients sending more data than the set content size.
|
|
limitDataReader = io.LimitReader(data, size)
|
|
} else {
|
|
// else we read till EOF.
|
|
limitDataReader = data
|
|
}
|
|
|
|
// Allocate a buffer to Read() from request body
|
|
bufSize := int64(readSizeV1)
|
|
if size > 0 && bufSize > size {
|
|
bufSize = size
|
|
}
|
|
buf := make([]byte, int(bufSize))
|
|
teeReader := io.TeeReader(limitDataReader, multiWriter)
|
|
fsTmpObjPath := pathJoin(fs.fsPath, minioMetaTmpBucket, fs.fsUUID, tempObj)
|
|
bytesWritten, err := fsCreateFile(fsTmpObjPath, teeReader, buf, size)
|
|
if err != nil {
|
|
fsRemoveFile(fsTmpObjPath)
|
|
errorIf(err, "Failed to create object %s/%s", bucket, object)
|
|
return ObjectInfo{}, toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Should return IncompleteBody{} error when reader has fewer
|
|
// bytes than specified in request header.
|
|
if bytesWritten < size {
|
|
fsRemoveFile(fsTmpObjPath)
|
|
return ObjectInfo{}, traceError(IncompleteBody{})
|
|
}
|
|
|
|
// Delete the temporary object in the case of a
|
|
// failure. If PutObject succeeds, then there would be
|
|
// nothing to delete.
|
|
defer fsRemoveFile(fsTmpObjPath)
|
|
|
|
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
|
|
// Update the md5sum if not set with the newly calculated one.
|
|
if len(metadata["md5Sum"]) == 0 {
|
|
metadata["md5Sum"] = newMD5Hex
|
|
}
|
|
|
|
// md5Hex representation.
|
|
md5Hex := metadata["md5Sum"]
|
|
if md5Hex != "" {
|
|
if newMD5Hex != md5Hex {
|
|
// Returns md5 mismatch.
|
|
return ObjectInfo{}, traceError(BadDigest{md5Hex, newMD5Hex})
|
|
}
|
|
}
|
|
|
|
if sha256sum != "" {
|
|
newSHA256sum := hex.EncodeToString(sha256Writer.Sum(nil))
|
|
if newSHA256sum != sha256sum {
|
|
return ObjectInfo{}, traceError(SHA256Mismatch{})
|
|
}
|
|
}
|
|
|
|
// Entire object was written to the temp location, now it's safe to rename it to the actual location.
|
|
fsNSObjPath := pathJoin(fs.fsPath, bucket, object)
|
|
if err = fsRenameFile(fsTmpObjPath, fsNSObjPath); err != nil {
|
|
return ObjectInfo{}, toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
if bucket != minioMetaBucket {
|
|
// Write FS metadata after a successful namespace operation.
|
|
if _, err = fsMeta.WriteTo(wlk); err != nil {
|
|
return ObjectInfo{}, toObjectErr(err, bucket, object)
|
|
}
|
|
}
|
|
|
|
// Stat the file to fetch timestamp, size.
|
|
fi, err := fsStatFile(pathJoin(fs.fsPath, bucket, object))
|
|
if err != nil {
|
|
return ObjectInfo{}, toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Success.
|
|
return fsMeta.ToObjectInfo(bucket, object, fi), nil
|
|
}
|
|
|
|
// DeleteObject - deletes an object from a bucket, this operation is destructive
|
|
// and there are no rollbacks supported.
|
|
func (fs fsObjects) DeleteObject(bucket, object string) error {
|
|
if err := checkDelObjArgs(bucket, object); err != nil {
|
|
return err
|
|
}
|
|
|
|
if _, err := fs.statBucketDir(bucket); err != nil {
|
|
return toObjectErr(err, bucket)
|
|
}
|
|
|
|
minioMetaBucketDir := pathJoin(fs.fsPath, minioMetaBucket)
|
|
fsMetaPath := pathJoin(minioMetaBucketDir, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
|
|
if bucket != minioMetaBucket {
|
|
rwlk, lerr := fs.rwPool.Write(fsMetaPath)
|
|
if lerr == nil {
|
|
// This close will allow for fs locks to be synchronized on `fs.json`.
|
|
defer rwlk.Close()
|
|
}
|
|
if lerr != nil && lerr != errFileNotFound {
|
|
return toObjectErr(traceError(lerr), bucket, object)
|
|
}
|
|
}
|
|
|
|
// Delete the object.
|
|
if err := fsDeleteFile(pathJoin(fs.fsPath, bucket), pathJoin(fs.fsPath, bucket, object)); err != nil {
|
|
return toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
if bucket != minioMetaBucket {
|
|
// Delete the metadata object.
|
|
err := fsDeleteFile(minioMetaBucketDir, fsMetaPath)
|
|
if err != nil && errorCause(err) != errFileNotFound {
|
|
return toObjectErr(err, bucket, object)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// list of all errors that can be ignored in tree walk operation in FS
|
|
var fsTreeWalkIgnoredErrs = append(baseIgnoredErrs, []error{
|
|
errFileNotFound,
|
|
errVolumeNotFound,
|
|
}...)
|
|
|
|
// 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.
|
|
func (fs fsObjects) listDirFactory(isLeaf isLeafFunc) 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) {
|
|
entries, err = readDir(pathJoin(fs.fsPath, bucket, prefixDir))
|
|
if err != nil {
|
|
return nil, false, err
|
|
}
|
|
entries, delayIsLeaf = filterListEntries(bucket, prefixDir, entries, prefixEntry, isLeaf)
|
|
return entries, delayIsLeaf, nil
|
|
}
|
|
|
|
// Return list factory instance.
|
|
return listDir
|
|
}
|
|
|
|
// ListObjects - list all objects at prefix upto maxKeys., optionally delimited by '/'. Maintains the list pool
|
|
// state for future re-entrant list requests.
|
|
func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
|
|
if err := checkListObjsArgs(bucket, prefix, marker, delimiter, fs); err != nil {
|
|
return ListObjectsInfo{}, err
|
|
}
|
|
|
|
if _, err := fs.statBucketDir(bucket); 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
|
|
}
|
|
|
|
// Default is recursive, if delimiter is set then list non recursive.
|
|
recursive := true
|
|
if delimiter == slashSeparator {
|
|
recursive = false
|
|
}
|
|
|
|
// Convert entry to ObjectInfo
|
|
entryToObjectInfo := func(entry string) (objInfo ObjectInfo, err error) {
|
|
if hasSuffix(entry, slashSeparator) {
|
|
// Object name needs to be full path.
|
|
objInfo.Name = entry
|
|
objInfo.IsDir = true
|
|
return
|
|
}
|
|
// Stat the file to get file size.
|
|
var fi os.FileInfo
|
|
fi, err = fsStatFile(pathJoin(fs.fsPath, bucket, entry))
|
|
if err != nil {
|
|
return ObjectInfo{}, toObjectErr(err, bucket, entry)
|
|
}
|
|
fsMeta := fsMetaV1{}
|
|
return fsMeta.ToObjectInfo(bucket, entry, fi), nil
|
|
}
|
|
|
|
heal := false // true only for xl.ListObjectsHeal()
|
|
walkResultCh, endWalkCh := fs.listPool.Release(listParams{bucket, recursive, marker, prefix, heal})
|
|
if walkResultCh == nil {
|
|
endWalkCh = make(chan struct{})
|
|
isLeaf := func(bucket, object string) bool {
|
|
// bucket argument is unused as we don't need to StatFile
|
|
// to figure if it's a file, just need to check that the
|
|
// object string does not end with "/".
|
|
return !hasSuffix(object, slashSeparator)
|
|
}
|
|
listDir := fs.listDirFactory(isLeaf)
|
|
walkResultCh = startTreeWalk(bucket, prefix, marker, recursive, listDir, isLeaf, endWalkCh)
|
|
}
|
|
|
|
var objInfos []ObjectInfo
|
|
var eof bool
|
|
var nextMarker string
|
|
|
|
// List until maxKeys requested.
|
|
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 {
|
|
// File not found is a valid case.
|
|
if errorCause(walkResult.err) == errFileNotFound {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
|
|
}
|
|
objInfo, err := entryToObjectInfo(walkResult.entry)
|
|
if err != nil {
|
|
return ListObjectsInfo{}, nil
|
|
}
|
|
nextMarker = objInfo.Name
|
|
objInfos = append(objInfos, objInfo)
|
|
if walkResult.end {
|
|
eof = true
|
|
break
|
|
}
|
|
i++
|
|
}
|
|
|
|
// Save list routine for the next marker if we haven't reached EOF.
|
|
params := listParams{bucket, recursive, nextMarker, prefix, heal}
|
|
if !eof {
|
|
fs.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)
|
|
}
|
|
|
|
// Success.
|
|
return result, nil
|
|
}
|
|
|
|
// HealObject - no-op for fs. Valid only for XL.
|
|
func (fs fsObjects) HealObject(bucket, object string) error {
|
|
return traceError(NotImplemented{})
|
|
}
|
|
|
|
// HealBucket - no-op for fs, Valid only for XL.
|
|
func (fs fsObjects) HealBucket(bucket string) error {
|
|
return traceError(NotImplemented{})
|
|
}
|
|
|
|
// ListObjectsHeal - list all objects to be healed. Valid only for XL
|
|
func (fs fsObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
|
|
return ListObjectsInfo{}, traceError(NotImplemented{})
|
|
}
|
|
|
|
// ListBucketsHeal - list all buckets to be healed. Valid only for XL
|
|
func (fs fsObjects) ListBucketsHeal() ([]BucketInfo, error) {
|
|
return []BucketInfo{}, traceError(NotImplemented{})
|
|
}
|