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minio/xl-objects.go

254 lines
7.4 KiB

/*
* 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 (
"encoding/json"
"io"
"path/filepath"
"strings"
"sync"
"github.com/minio/minio/pkg/mimedb"
)
const (
multipartSuffix = ".minio.multipart"
multipartMetaFile = "00000" + multipartSuffix
)
// xlObjects - Implements fs object layer.
type xlObjects struct {
storage StorageAPI
listObjectMap map[listParams][]*treeWalker
listObjectMapMutex *sync.Mutex
}
func isLeafDirectory(disk StorageAPI, volume, leafPath string) bool {
_, err := disk.StatFile(volume, pathJoin(leafPath, multipartMetaFile))
return err == nil
}
// FIXME: constructor should return a pointer.
// newXLObjects - initialize new xl object layer.
func newXLObjects(exportPaths ...string) (ObjectLayer, error) {
storage, err := newXL(exportPaths...)
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 xlObjects{
storage: storage,
listObjectMap: make(map[listParams][]*treeWalker),
listObjectMapMutex: &sync.Mutex{},
}, nil
}
/// Bucket operations
// MakeBucket - make a bucket.
func (xl xlObjects) MakeBucket(bucket string) error {
return makeBucket(xl.storage, bucket)
}
// GetBucketInfo - get bucket info.
func (xl xlObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
return getBucketInfo(xl.storage, bucket)
}
// ListBuckets - list buckets.
func (xl xlObjects) ListBuckets() ([]BucketInfo, error) {
return listBuckets(xl.storage)
}
// DeleteBucket - delete a bucket.
func (xl xlObjects) DeleteBucket(bucket string) error {
return deleteBucket(xl.storage, bucket)
}
/// Object Operations
// GetObject - get an object.
func (xl xlObjects) 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}
}
if ok, err := isMultipartObject(xl.storage, bucket, object); err != nil {
return nil, toObjectErr(err, bucket, object)
} else if !ok {
if _, err = xl.storage.StatFile(bucket, object); err == nil {
var reader io.ReadCloser
reader, err = xl.storage.ReadFile(bucket, object, startOffset)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
return reader, nil
}
return nil, toObjectErr(err, bucket, object)
}
fileReader, fileWriter := io.Pipe()
info, err := getMultipartObjectInfo(xl.storage, bucket, object)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
partIndex, offset, err := info.GetPartNumberOffset(startOffset)
if err != nil {
return nil, toObjectErr(err, bucket, object)
}
go func() {
for ; partIndex < len(info.Parts); partIndex++ {
part := info.Parts[partIndex]
r, err := xl.storage.ReadFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)), offset)
if err != nil {
fileWriter.CloseWithError(err)
return
}
if _, err := io.Copy(fileWriter, r); err != nil {
fileWriter.CloseWithError(err)
return
}
}
fileWriter.Close()
}()
return fileReader, nil
}
// Return the partsInfo of a special multipart object.
func getMultipartObjectInfo(storage StorageAPI, bucket, object string) (info MultipartObjectInfo, err error) {
offset := int64(0)
r, err := storage.ReadFile(bucket, pathJoin(object, multipartMetaFile), offset)
if err != nil {
return
}
decoder := json.NewDecoder(r)
err = decoder.Decode(&info)
return
}
// GetObjectInfo - get object info.
func (xl xlObjects) 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}
}
// Check whether the bucket exists.
if isExist, err := isBucketExist(xl.storage, bucket); err != nil {
return ObjectInfo{}, err
} else if !isExist {
return ObjectInfo{}, BucketNotFound{Bucket: bucket}
}
fi, err := xl.storage.StatFile(bucket, object)
if err != nil {
if err != errFileNotFound {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
var info MultipartObjectInfo
info, err = getMultipartObjectInfo(xl.storage, bucket, object)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
fi.Size = info.Size
fi.ModTime = info.ModTime
fi.MD5Sum = info.MD5Sum
}
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: fi.MD5Sum,
}, nil
}
// PutObject - create an object.
func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
return putObjectCommon(xl.storage, bucket, object, size, data, metadata)
}
// isMultipartObject - verifies if an object is special multipart file.
func isMultipartObject(storage StorageAPI, bucket, object string) (bool, error) {
_, err := storage.StatFile(bucket, pathJoin(object, multipartMetaFile))
if err != nil {
if err == errFileNotFound {
return false, nil
}
return false, err
}
return true, nil
}
func (xl xlObjects) 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}
}
// Verify if the object is a multipart object.
if ok, err := isMultipartObject(xl.storage, bucket, object); err != nil {
return toObjectErr(err, bucket, object)
} else if !ok {
if err := xl.storage.DeleteFile(bucket, object); err != nil {
return toObjectErr(err, bucket, object)
}
}
// Get parts info.
info, err := getMultipartObjectInfo(xl.storage, bucket, object)
if err != nil {
return toObjectErr(err, bucket, object)
}
// Range through all files and delete it.
for _, part := range info.Parts {
err = xl.storage.DeleteFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)))
if err != nil {
return toObjectErr(err, bucket, object)
}
}
err = xl.storage.DeleteFile(bucket, pathJoin(object, multipartMetaFile))
if err != nil {
return toObjectErr(err, bucket, object)
}
return nil
}
func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
return listObjectsCommon(xl, bucket, prefix, marker, delimiter, maxKeys)
}