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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 cmd
import (
"crypto/md5"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"hash"
"io"
"path"
"sort"
"strings"
"github.com/minio/minio/pkg/mimedb"
)
// fsObjects - Implements fs object layer.
type fsObjects struct {
storage StorageAPI
// List pool management.
listPool *treeWalkPool
// To manage the appendRoutine go0routines
bgAppend *backgroundAppend
}
// list of all errors that can be ignored in tree walk operation in FS
var fsTreeWalkIgnoredErrs = []error{
errFileNotFound,
errVolumeNotFound,
}
// newFSObjects - initialize new fs object layer.
func newFSObjects(storage StorageAPI) (ObjectLayer, error) {
if storage == nil {
return nil, errInvalidArgument
}
// Load format and validate.
_, err := loadFormatFS(storage)
if err != nil {
return nil, fmt.Errorf("Unable to recognize backend format, %s", err)
}
// Initialize meta volume, if volume already exists ignores it.
if err = initMetaVolume([]StorageAPI{storage}); err != nil {
return nil, fmt.Errorf("Unable to initialize '.minio.sys' meta volume, %s", err)
}
// Initialize fs objects.
fs := fsObjects{
storage: storage,
listPool: newTreeWalkPool(globalLookupTimeout),
bgAppend: &backgroundAppend{
infoMap: make(map[string]bgAppendPartsInfo),
},
}
// Return successfully initialized object layer.
return fs, nil
}
// Should be called when process shuts down.
func (fs fsObjects) Shutdown() error {
// List if there are any multipart entries.
prefix := ""
entries, err := fs.storage.ListDir(minioMetaMultipartBucket, prefix)
if err != nil {
// A non nil err means that an unexpected error occurred
return toObjectErr(traceError(err))
}
if len(entries) > 0 {
// Should not remove .minio.sys if there are any multipart
// uploads were found.
return nil
}
if err = fs.storage.DeleteVol(minioMetaMultipartBucket); err != nil {
return toObjectErr(traceError(err))
}
// List if there are any bucket configuration entries.
_, err = fs.storage.ListDir(minioMetaBucket, bucketConfigPrefix)
if err != errFileNotFound {
// A nil err means that bucket config directory is not empty hence do not remove '.minio.sys' volume.
// A non nil err means that an unexpected error occurred
return toObjectErr(traceError(err))
}
// Cleanup and delete tmp bucket.
if err = cleanupDir(fs.storage, minioMetaTmpBucket, prefix); err != nil {
return err
}
if err = fs.storage.DeleteVol(minioMetaTmpBucket); err != nil {
return toObjectErr(traceError(err))
}
// Remove format.json and delete .minio.sys bucket
if err = fs.storage.DeleteFile(minioMetaBucket, fsFormatJSONFile); err != nil {
return toObjectErr(traceError(err))
}
if err = fs.storage.DeleteVol(minioMetaBucket); err != nil {
if err != errVolumeNotEmpty {
return toObjectErr(traceError(err))
}
}
// Successful.
return nil
}
// StorageInfo - returns underlying storage statistics.
func (fs fsObjects) StorageInfo() StorageInfo {
info, err := fs.storage.DiskInfo()
errorIf(err, "Unable to get disk info %#v", fs.storage)
storageInfo := StorageInfo{
Total: info.Total,
Free: info.Free,
}
storageInfo.Backend.Type = FS
return storageInfo
}
/// Bucket operations
// MakeBucket - make a bucket.
func (fs fsObjects) MakeBucket(bucket string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return traceError(BucketNameInvalid{Bucket: bucket})
}
if err := fs.storage.MakeVol(bucket); err != nil {
return toObjectErr(traceError(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{}, traceError(BucketNameInvalid{Bucket: bucket})
}
vi, err := fs.storage.StatVol(bucket)
if err != nil {
return BucketInfo{}, toObjectErr(traceError(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(traceError(err))
}
var invalidBucketNames []string
for _, vol := range vols {
// StorageAPI can send volume names which are incompatible
// with buckets, handle it and skip them.
if !IsValidBucketName(vol.Name) {
invalidBucketNames = append(invalidBucketNames, vol.Name)
continue
}
// Ignore the volume special bucket.
if vol.Name == minioMetaBucket {
continue
}
bucketInfos = append(bucketInfos, BucketInfo{
Name: vol.Name,
Created: vol.Created,
})
}
// Print a user friendly message if we indeed skipped certain directories which are
// incompatible with S3's bucket name restrictions.
if len(invalidBucketNames) > 0 {
errorIf(errors.New("One or more invalid bucket names found"), "Skipping %s", invalidBucketNames)
}
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 traceError(BucketNameInvalid{Bucket: bucket})
}
// Attempt to delete regular bucket.
if err := fs.storage.DeleteVol(bucket); err != nil {
return toObjectErr(traceError(err), bucket)
}
// Cleanup all the previously incomplete multiparts.
if err := cleanupDir(fs.storage, minioMetaMultipartBucket, bucket); err != nil && errorCause(err) != errVolumeNotFound {
return toObjectErr(err, bucket)
}
return nil
}
/// Object Operations
// GetObject - get an object.
func (fs fsObjects) GetObject(bucket, object string, offset int64, length int64, writer io.Writer) (err error) {
if err = checkGetObjArgs(bucket, object); err != nil {
return err
}
// Offset and length cannot be negative.
if offset < 0 || length < 0 {
return toObjectErr(traceError(errUnexpected), bucket, object)
}
// Writer cannot be nil.
if writer == nil {
return toObjectErr(traceError(errUnexpected), bucket, object)
}
// Stat the file to get file size.
fi, err := fs.storage.StatFile(bucket, object)
if err != nil {
return toObjectErr(traceError(err), bucket, object)
}
// Reply back invalid range if the input offset and length fall out of range.
if offset > fi.Size || length > fi.Size {
return traceError(InvalidRange{offset, length, fi.Size})
}
// Reply if we have inputs with offset and length falling out of file size range.
if offset+length > fi.Size {
return traceError(InvalidRange{offset, length, fi.Size})
}
var totalLeft = length
bufSize := int64(readSizeV1)
if length > 0 && bufSize > length {
bufSize = length
}
// Allocate a staging buffer.
buf := make([]byte, int(bufSize))
for {
// Figure out the right size for the buffer.
curLeft := bufSize
if totalLeft < bufSize {
curLeft = totalLeft
}
// Reads the file at offset.
nr, er := fs.storage.ReadFile(bucket, object, offset, buf[:curLeft])
if nr > 0 {
// Write to response writer.
nw, ew := writer.Write(buf[0:nr])
if nw > 0 {
// Decrement whats left to write.
totalLeft -= int64(nw)
// Progress the offset
offset += int64(nw)
}
if ew != nil {
err = traceError(ew)
break
}
if nr != int64(nw) {
err = traceError(io.ErrShortWrite)
break
}
}
if er == io.EOF || er == io.ErrUnexpectedEOF {
break
}
if er != nil {
err = traceError(er)
break
}
if totalLeft == 0 {
break
}
}
// Returns any error.
return toObjectErr(err, bucket, object)
}
// getObjectInfo - get object info.
func (fs fsObjects) getObjectInfo(bucket, object string) (ObjectInfo, error) {
fi, err := fs.storage.StatFile(bucket, object)
if err != nil {
return ObjectInfo{}, toObjectErr(traceError(err), bucket, object)
}
fsMeta, err := readFSMetadata(fs.storage, minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile))
// Ignore error if the metadata file is not found, other errors must be returned.
if err != nil && errorCause(err) != errFileNotFound {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
if len(fsMeta.Meta) == 0 {
fsMeta.Meta = make(map[string]string)
}
// Guess content-type from the extension if possible.
if fsMeta.Meta["content-type"] == "" {
if objectExt := path.Ext(object); objectExt != "" {
if content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]; ok {
fsMeta.Meta["content-type"] = content.ContentType
}
}
}
objInfo := ObjectInfo{
Bucket: bucket,
Name: object,
ModTime: fi.ModTime,
Size: fi.Size,
IsDir: fi.Mode.IsDir(),
MD5Sum: fsMeta.Meta["md5Sum"],
ContentType: fsMeta.Meta["content-type"],
ContentEncoding: fsMeta.Meta["content-encoding"],
}
// md5Sum has already been extracted into objInfo.MD5Sum. We
// need to remove it from fsMeta.Meta to avoid it from appearing as
// part of response headers. e.g, X-Minio-* or X-Amz-*.
delete(fsMeta.Meta, "md5Sum")
objInfo.UserDefined = fsMeta.Meta
return objInfo, nil
}
// GetObjectInfo - get object info.
func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
if err := checkGetObjArgs(bucket, object); err != nil {
return ObjectInfo{}, err
}
return fs.getObjectInfo(bucket, object)
}
// PutObject - create an object.
func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
if err = checkPutObjectArgs(bucket, object, fs); err != nil {
return ObjectInfo{}, err
}
// No metadata is set, allocate a new one.
if metadata == nil {
metadata = make(map[string]string)
}
uniqueID := mustGetUUID()
// 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 := uniqueID
// 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
}
// Prepare file to avoid disk fragmentation
if size > 0 {
err = fs.storage.PrepareFile(minioMetaTmpBucket, tempObj, size)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
}
// 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)
var bytesWritten int64
bytesWritten, err = fsCreateFile(fs.storage, teeReader, buf, minioMetaTmpBucket, tempObj)
if err != nil {
fs.storage.DeleteFile(minioMetaTmpBucket, tempObj)
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 {
fs.storage.DeleteFile(minioMetaTmpBucket, tempObj)
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 fs.storage.DeleteFile(minioMetaTmpBucket, tempObj)
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.
err = fs.storage.RenameFile(minioMetaTmpBucket, tempObj, bucket, object)
if err != nil {
return ObjectInfo{}, toObjectErr(traceError(err), bucket, object)
}
if bucket != minioMetaBucket {
// Save objects' metadata in `fs.json`.
// Skip creating fs.json if bucket is .minio.sys as the object would have been created
// by minio's S3 layer (ex. policy.json)
fsMeta := newFSMetaV1()
fsMeta.Meta = metadata
fsMetaPath := path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile)
if err = writeFSMetadata(fs.storage, minioMetaBucket, fsMetaPath, fsMeta); err != nil {
return ObjectInfo{}, toObjectErr(traceError(err), bucket, object)
}
}
return fs.getObjectInfo(bucket, object)
}
// 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 bucket != minioMetaBucket {
// We don't store fs.json for minio-S3-layer created files like policy.json,
// hence we don't try to delete fs.json for such files.
err := fs.storage.DeleteFile(minioMetaBucket, path.Join(bucketMetaPrefix, bucket, object, fsMetaJSONFile))
if err != nil && err != errFileNotFound {
return toObjectErr(traceError(err), bucket, object)
}
}
if err := fs.storage.DeleteFile(bucket, object); err != nil {
return toObjectErr(traceError(err), bucket, object)
}
return nil
}
// 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) {
// Convert entry to ObjectInfo
entryToObjectInfo := func(entry string) (objInfo ObjectInfo, err error) {
if strings.HasSuffix(entry, slashSeparator) {
// Object name needs to be full path.
objInfo.Name = entry
objInfo.IsDir = true
return
}
if objInfo, err = fs.getObjectInfo(bucket, entry); err != nil {
return ObjectInfo{}, err
}
return
}
if err := checkListObjsArgs(bucket, prefix, marker, delimiter, fs); 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
}
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 !strings.HasSuffix(object, slashSeparator)
}
listDir := listDirFactory(isLeaf, fsTreeWalkIgnoredErrs, fs.storage)
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 {
// 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++
}
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)
}
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{})
}