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minio/fs-v1.go

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/*
* 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 main
import (
"crypto/md5"
"encoding/hex"
"io"
"path/filepath"
"sort"
"strings"
"sync"
"github.com/minio/minio/pkg/disk"
"github.com/minio/minio/pkg/mimedb"
)
// fsObjects - Implements fs object layer.
type fsObjects struct {
storage StorageAPI
physicalDisk string
listObjectMap map[listParams][]*treeWalkerFS
listObjectMapMutex *sync.Mutex
}
// newFSObjects - initialize new fs object layer.
func newFSObjects(disk string) (ObjectLayer, error) {
var storage StorageAPI
var err error
if !strings.ContainsRune(disk, ':') || filepath.VolumeName(disk) != "" {
// Initialize filesystem storage API.
storage, err = newPosix(disk)
if err != nil {
return nil, err
}
} else {
// Initialize rpc client storage API.
storage, err = newRPCClient(disk)
if err != nil {
return nil, err
}
}
// Initialize object layer - like creating minioMetaBucket,
// cleaning up tmp files etc.
initObjectLayer(storage)
// Return successfully initialized object layer.
return fsObjects{
storage: storage,
physicalDisk: disk,
listObjectMap: make(map[listParams][]*treeWalkerFS),
listObjectMapMutex: &sync.Mutex{},
}, nil
}
// StorageInfo - returns underlying storage statistics.
func (fs fsObjects) StorageInfo() StorageInfo {
info, err := disk.GetInfo(fs.physicalDisk)
fatalIf(err, "Unable to get disk info "+fs.physicalDisk)
return StorageInfo{
Total: info.Total,
Free: info.Free,
}
}
/// Bucket operations
// MakeBucket - make a bucket.
func (fs fsObjects) MakeBucket(bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if err := fs.storage.MakeVol(bucket); err != nil {
return toObjectErr(err, bucket)
}
return nil
}
// GetBucketInfo - get bucket info.
func (fs fsObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketInfo{}, BucketNameInvalid{Bucket: bucket}
}
vi, err := fs.storage.StatVol(bucket)
if err != nil {
return BucketInfo{}, toObjectErr(err, bucket)
}
return BucketInfo{
Name: bucket,
Created: vi.Created,
}, nil
}
// ListBuckets - list buckets.
func (fs fsObjects) ListBuckets() ([]BucketInfo, error) {
var bucketInfos []BucketInfo
vols, err := fs.storage.ListVols()
if err != nil {
return nil, toObjectErr(err)
}
for _, vol := range vols {
// StorageAPI can send volume names which are incompatible
// with buckets, handle it and skip them.
if !IsValidBucketName(vol.Name) {
continue
}
bucketInfos = append(bucketInfos, BucketInfo{
Name: vol.Name,
Created: vol.Created,
})
}
sort.Sort(byBucketName(bucketInfos))
return bucketInfos, nil
}
// DeleteBucket - delete a bucket.
func (fs fsObjects) DeleteBucket(bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if err := fs.storage.DeleteVol(bucket); err != nil {
return toObjectErr(err, bucket)
}
return nil
}
/// Object Operations
// GetObject - get an object.
func (fs fsObjects) GetObject(bucket, object string, startOffset int64) (io.ReadCloser, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return nil, BucketNameInvalid{Bucket: bucket}
}
// Verify if object is valid.
if !IsValidObjectName(object) {
return nil, ObjectNameInvalid{Bucket: bucket, Object: object}
}
fileReader, err := fs.storage.ReadFile(bucket, object, startOffset)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
return fileReader, nil
}
// GetObjectInfo - get object info.
func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ObjectInfo{}, (BucketNameInvalid{Bucket: bucket})
}
// Verify if object is valid.
if !IsValidObjectName(object) {
return ObjectInfo{}, (ObjectNameInvalid{Bucket: bucket, Object: object})
}
fi, err := fs.storage.StatFile(bucket, object)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
contentType := "application/octet-stream"
if objectExt := filepath.Ext(object); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
return ObjectInfo{
Bucket: bucket,
Name: object,
ModTime: fi.ModTime,
Size: fi.Size,
IsDir: fi.Mode.IsDir(),
ContentType: contentType,
MD5Sum: "", // Read from metadata.
}, nil
}
// PutObject - create an object.
func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{
Bucket: bucket,
Object: object,
}
}
fileWriter, err := fs.storage.CreateFile(bucket, object)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, fileWriter)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, err = io.CopyN(multiWriter, data, size); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
} else {
if _, err = io.Copy(multiWriter, data); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", toObjectErr(err, bucket, object)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
// md5Hex representation.
var md5Hex string
if len(metadata) != 0 {
md5Hex = metadata["md5Sum"]
}
if md5Hex != "" {
if newMD5Hex != md5Hex {
if err = safeCloseAndRemove(fileWriter); err != nil {
return "", err
}
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", clErr
}
return "", err
}
// Return md5sum, successfully wrote object.
return newMD5Hex, nil
}
func (fs fsObjects) DeleteObject(bucket, object string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ObjectNameInvalid{Bucket: bucket, Object: object}
}
if err := fs.storage.DeleteFile(bucket, object); err != nil {
return toObjectErr(err, bucket, object)
}
return nil
}
// Checks whether bucket exists.
func isBucketExist(storage StorageAPI, bucketName string) bool {
// Check whether bucket exists.
_, err := storage.StatVol(bucketName)
if err != nil {
if err == errVolumeNotFound {
return false
}
errorIf(err, "Stat failed on bucket "+bucketName+".")
return false
}
return true
}
func (fs fsObjects) listObjectsFS(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 !isBucketExist(fs.storage, 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
}
// Default is recursive, if delimiter is set then list non recursive.
recursive := true
if delimiter == slashSeparator {
recursive = false
}
walker := fs.lookupTreeWalk(listParams{bucket, recursive, marker, prefix})
if walker == nil {
walker = fs.startTreeWalk(bucket, prefix, marker, recursive)
}
var fileInfos []FileInfo
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)
}
fileInfo := walkResult.fileInfo
nextMarker = fileInfo.Name
fileInfos = append(fileInfos, fileInfo)
if walkResult.end {
eof = true
break
}
i++
}
params := listParams{bucket, recursive, nextMarker, prefix}
if !eof {
fs.saveTreeWalk(params, walker)
}
result := ListObjectsInfo{IsTruncated: !eof}
for _, fileInfo := range fileInfos {
// With delimiter set we fill in NextMarker and Prefixes.
if delimiter == slashSeparator {
result.NextMarker = fileInfo.Name
if fileInfo.Mode.IsDir() {
result.Prefixes = append(result.Prefixes, fileInfo.Name)
continue
}
}
result.Objects = append(result.Objects, ObjectInfo{
Name: fileInfo.Name,
ModTime: fileInfo.ModTime,
Size: fileInfo.Size,
IsDir: false,
})
}
return result, nil
}
// ListObjects - list all objects.
func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
return fs.listObjectsFS(bucket, prefix, marker, delimiter, maxKeys)
}