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388 lines
11 KiB
388 lines
11 KiB
/*
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* Minio Cloud Storage, (C) 2016 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 main
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import (
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"encoding/json"
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"io"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"github.com/Sirupsen/logrus"
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"github.com/minio/minio/pkg/mimedb"
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)
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const (
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multipartSuffix = ".minio.multipart"
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multipartMetaFile = "00000" + multipartSuffix
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)
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// xlObjects - Implements fs object layer.
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type xlObjects struct {
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storage StorageAPI
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listObjectMap map[listParams][]*treeWalker
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listObjectMapMutex *sync.Mutex
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}
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func isLeafDirectory(disk StorageAPI, volume, leafPath string) bool {
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_, err := disk.StatFile(volume, pathJoin(leafPath, multipartMetaFile))
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return err == nil
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}
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// FIXME: constructor should return a pointer.
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// newXLObjects - initialize new xl object layer.
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func newXLObjects(exportPaths ...string) (ObjectLayer, error) {
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storage, err := newXL(exportPaths...)
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if err != nil {
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return nil, err
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}
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// Initialize object layer - like creating minioMetaBucket,
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// cleaning up tmp files etc.
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initObjectLayer(storage)
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// Return successfully initialized object layer.
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return xlObjects{
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storage: storage,
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listObjectMap: make(map[listParams][]*treeWalker),
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listObjectMapMutex: &sync.Mutex{},
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}, nil
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}
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/// Bucket operations
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// MakeBucket - make a bucket.
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func (xl xlObjects) MakeBucket(bucket string) error {
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return makeBucket(xl.storage, bucket)
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}
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// GetBucketInfo - get bucket info.
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func (xl xlObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
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return getBucketInfo(xl.storage, bucket)
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}
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// ListBuckets - list buckets.
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func (xl xlObjects) ListBuckets() ([]BucketInfo, error) {
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return listBuckets(xl.storage)
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}
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// DeleteBucket - delete a bucket.
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func (xl xlObjects) DeleteBucket(bucket string) error {
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return deleteBucket(xl.storage, bucket)
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}
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/// Object Operations
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// GetObject - get an object.
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func (xl xlObjects) GetObject(bucket, object string, startOffset int64) (io.ReadCloser, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return nil, BucketNameInvalid{Bucket: bucket}
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}
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// Verify if object is valid.
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if !IsValidObjectName(object) {
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return nil, ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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if ok, err := isMultipartObject(xl.storage, bucket, object); err != nil {
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return nil, toObjectErr(err, bucket, object)
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} else if !ok {
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if _, err = xl.storage.StatFile(bucket, object); err == nil {
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var reader io.ReadCloser
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reader, err = xl.storage.ReadFile(bucket, object, startOffset)
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if err != nil {
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return nil, toObjectErr(err, bucket, object)
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}
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return reader, nil
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}
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return nil, toObjectErr(err, bucket, object)
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}
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fileReader, fileWriter := io.Pipe()
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info, err := getMultipartObjectInfo(xl.storage, bucket, object)
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if err != nil {
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return nil, toObjectErr(err, bucket, object)
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}
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partIndex, offset, err := info.GetPartNumberOffset(startOffset)
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if err != nil {
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return nil, toObjectErr(err, bucket, object)
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}
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go func() {
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for ; partIndex < len(info.Parts); partIndex++ {
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part := info.Parts[partIndex]
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r, err := xl.storage.ReadFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)), offset)
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if err != nil {
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fileWriter.CloseWithError(err)
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return
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}
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if _, err := io.Copy(fileWriter, r); err != nil {
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fileWriter.CloseWithError(err)
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return
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}
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}
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fileWriter.Close()
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}()
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return fileReader, nil
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}
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// Return the partsInfo of a special multipart object.
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func getMultipartObjectInfo(storage StorageAPI, bucket, object string) (info MultipartObjectInfo, err error) {
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offset := int64(0)
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r, err := storage.ReadFile(bucket, pathJoin(object, multipartMetaFile), offset)
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if err != nil {
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return
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}
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decoder := json.NewDecoder(r)
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err = decoder.Decode(&info)
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return
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}
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// GetObjectInfo - get object info.
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func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ObjectInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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// Verify if object is valid.
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if !IsValidObjectName(object) {
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return ObjectInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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fi, err := xl.storage.StatFile(bucket, object)
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if err != nil {
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if err == errFileNotFound {
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var info MultipartObjectInfo
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info, err = getMultipartObjectInfo(xl.storage, 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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fi.Size = info.Size
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fi.ModTime = info.ModTime
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fi.MD5Sum = info.MD5Sum
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}
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return ObjectInfo{}, toObjectErr(err, bucket, object)
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}
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contentType := "application/octet-stream"
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if objectExt := filepath.Ext(object); objectExt != "" {
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content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
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if ok {
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contentType = content.ContentType
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}
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}
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return ObjectInfo{
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Bucket: bucket,
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Name: object,
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ModTime: fi.ModTime,
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Size: fi.Size,
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IsDir: fi.Mode.IsDir(),
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ContentType: contentType,
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MD5Sum: fi.MD5Sum,
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}, nil
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}
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// PutObject - create an object.
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func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (string, error) {
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return putObjectCommon(xl.storage, bucket, object, size, data, metadata)
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}
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// isMultipartObject - verifies if an object is special multipart file.
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func isMultipartObject(storage StorageAPI, bucket, object string) (bool, error) {
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_, err := storage.StatFile(bucket, pathJoin(object, multipartMetaFile))
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if err != nil {
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if err == errFileNotFound {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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func (xl xlObjects) DeleteObject(bucket, object string) error {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return BucketNameInvalid{Bucket: bucket}
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}
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if !IsValidObjectName(object) {
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return ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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// Verify if the object is a multipart object.
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if ok, err := isMultipartObject(xl.storage, bucket, object); err != nil {
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return toObjectErr(err, bucket, object)
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} else if !ok {
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if err := xl.storage.DeleteFile(bucket, object); err != nil {
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return toObjectErr(err, bucket, object)
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}
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}
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// Get parts info.
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info, err := getMultipartObjectInfo(xl.storage, bucket, object)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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// Range through all files and delete it.
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for _, part := range info.Parts {
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err = xl.storage.DeleteFile(bucket, pathJoin(object, partNumToPartFileName(part.PartNumber)))
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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}
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err = xl.storage.DeleteFile(bucket, pathJoin(object, multipartMetaFile))
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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return nil
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}
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func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ListObjectsInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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// Verify whether the bucket exists.
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if isExist, err := isBucketExist(xl.storage, bucket); err != nil {
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return ListObjectsInfo{}, err
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} else if !isExist {
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return ListObjectsInfo{}, BucketNotFound{Bucket: bucket}
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}
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if !IsValidObjectPrefix(prefix) {
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return ListObjectsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
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}
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// Verify if delimiter is anything other than '/', which we do not support.
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if delimiter != "" && delimiter != slashSeparator {
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return ListObjectsInfo{}, UnsupportedDelimiter{
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Delimiter: delimiter,
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}
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}
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// Verify if marker has prefix.
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if marker != "" {
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if !strings.HasPrefix(marker, prefix) {
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return ListObjectsInfo{}, InvalidMarkerPrefixCombination{
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Marker: marker,
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Prefix: prefix,
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}
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}
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}
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if maxKeys == 0 {
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return ListObjectsInfo{}, nil
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}
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// Default is recursive, if delimiter is set then list non recursive.
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recursive := true
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if delimiter == slashSeparator {
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recursive = false
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}
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walker := lookupTreeWalk(xl, listParams{bucket, recursive, marker, prefix})
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if walker == nil {
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walker = startTreeWalk(xl, bucket, prefix, marker, recursive)
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}
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var fileInfos []FileInfo
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var eof bool
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var err error
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var nextMarker string
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log.Debugf("Reading from the tree walk channel has begun.")
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for i := 0; i < maxKeys; {
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walkResult, ok := <-walker.ch
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if !ok {
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// Closed channel.
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eof = true
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break
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}
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// For any walk error return right away.
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if walkResult.err != nil {
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log.WithFields(logrus.Fields{
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"bucket": bucket,
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"prefix": prefix,
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"marker": marker,
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"recursive": recursive,
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}).Debugf("Walk resulted in an error %s", walkResult.err)
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// File not found is a valid case.
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if walkResult.err == errFileNotFound {
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return ListObjectsInfo{}, nil
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}
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return ListObjectsInfo{}, toObjectErr(walkResult.err, bucket, prefix)
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}
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fileInfo := walkResult.fileInfo
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if strings.HasSuffix(fileInfo.Name, slashSeparator) && isLeafDirectory(xl.storage, bucket, fileInfo.Name) {
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// Code flow reaches here for non-recursive listing.
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var info MultipartObjectInfo
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info, err = getMultipartObjectInfo(xl.storage, bucket, fileInfo.Name)
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if err == nil {
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// Set the Mode to a "regular" file.
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fileInfo.Mode = 0
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fileInfo.Name = strings.TrimSuffix(fileInfo.Name, slashSeparator)
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fileInfo.Size = info.Size
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fileInfo.MD5Sum = info.MD5Sum
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fileInfo.ModTime = info.ModTime
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} else if err != errFileNotFound {
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return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
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}
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} else if strings.HasSuffix(fileInfo.Name, multipartMetaFile) {
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// Code flow reaches here for recursive listing.
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// for object/00000.minio.multipart, strip the base name
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// and calculate get the object size.
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fileInfo.Name = path.Dir(fileInfo.Name)
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var info MultipartObjectInfo
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info, err = getMultipartObjectInfo(xl.storage, bucket, fileInfo.Name)
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if err != nil {
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return ListObjectsInfo{}, toObjectErr(err, bucket, fileInfo.Name)
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}
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fileInfo.Size = info.Size
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} else if strings.HasSuffix(fileInfo.Name, multipartSuffix) {
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// Ignore the part files like object/00001.minio.multipart
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continue
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}
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nextMarker = fileInfo.Name
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fileInfos = append(fileInfos, fileInfo)
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if walkResult.end {
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eof = true
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break
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}
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i++
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}
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params := listParams{bucket, recursive, nextMarker, prefix}
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log.WithFields(logrus.Fields{
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"bucket": params.bucket,
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"recursive": params.recursive,
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"marker": params.marker,
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"prefix": params.prefix,
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}).Debugf("Save the tree walk into map for subsequent requests.")
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if !eof {
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saveTreeWalk(xl, params, walker)
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}
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result := ListObjectsInfo{IsTruncated: !eof}
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for _, fileInfo := range fileInfos {
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// With delimiter set we fill in NextMarker and Prefixes.
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if delimiter == slashSeparator {
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result.NextMarker = fileInfo.Name
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if fileInfo.Mode.IsDir() {
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result.Prefixes = append(result.Prefixes, fileInfo.Name)
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continue
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}
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}
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result.Objects = append(result.Objects, ObjectInfo{
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Name: fileInfo.Name,
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ModTime: fileInfo.ModTime,
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Size: fileInfo.Size,
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IsDir: false,
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})
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}
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return result, nil
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}
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