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500 lines
14 KiB
500 lines
14 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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"bytes"
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"crypto/md5"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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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/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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formatConfigFile = "format.json"
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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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// isValidFormat - validates input arguments with backend 'format.json'
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func isValidFormat(storage StorageAPI, exportPaths ...string) bool {
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// Load saved XL format.json and validate.
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xl, err := loadFormatXL(storage)
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if err != nil {
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errorIf(err, "Unable to load format file 'format.json'.")
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return false
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}
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if xl.Version != "1" {
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return false
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}
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if len(exportPaths) != len(xl.Disks) {
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return false
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}
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for index, disk := range xl.Disks {
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if exportPaths[index] != disk {
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return false
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}
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}
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return true
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}
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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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err = checkFormat(storage)
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if err != nil {
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if err == errFileNotFound {
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// Save new XL format.
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errSave := saveFormatXL(storage, &xlFormat{
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Version: "1",
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Disks: exportPaths,
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})
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if errSave != nil {
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return nil, errSave
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}
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} else {
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if err == errReadQuorum {
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errMsg := fmt.Sprintf("Disks %s are offline. Unable to establish quorum.", exportPaths)
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err = errors.New(errMsg)
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} else if err == errDiskNotFound {
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errMsg := fmt.Sprintf("Disks %s not found.", exportPaths)
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err = errors.New(errMsg)
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} else if err == errVolumeAccessDenied {
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errMsg := fmt.Sprintf("Disks %s access permission denied.", exportPaths)
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err = errors.New(errMsg)
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}
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return nil, err
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}
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}
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// Validate if format exists and input arguments are validated with backend format.
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if !isValidFormat(storage, exportPaths...) {
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return nil, fmt.Errorf("Command-line arguments %s is not valid.", exportPaths)
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}
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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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nsMutex.Lock(bucket, "")
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defer nsMutex.Unlock(bucket, "")
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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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nsMutex.RLock(bucket, "")
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defer nsMutex.RUnlock(bucket, "")
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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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nsMutex.Lock(bucket, "")
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nsMutex.Unlock(bucket, "")
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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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nsMutex.RLock(bucket, object)
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defer nsMutex.RUnlock(bucket, object)
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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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// Hold a read lock once more which can be released after the following go-routine ends.
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// We hold RLock once more because the current function would return before the go routine below
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// executes and hence releasing the read lock (because of defer'ed nsMutex.RUnlock() call).
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nsMutex.RLock(bucket, object)
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go func() {
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defer nsMutex.RUnlock(bucket, object)
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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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// Reset offset to 0 as it would be non-0 only for the first loop if startOffset is non-0.
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offset = 0
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if _, err = io.Copy(fileWriter, r); err != nil {
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switch reader := r.(type) {
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case *io.PipeReader:
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reader.CloseWithError(err)
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case io.ReadCloser:
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reader.Close()
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}
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fileWriter.CloseWithError(err)
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return
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}
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// Close the readerCloser that reads multiparts of an object from the xl storage layer.
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// Not closing leaks underlying file descriptors.
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r.Close()
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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 MultipartObjectInfo{}, err
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}
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decoder := json.NewDecoder(r)
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err = decoder.Decode(&info)
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if err != nil {
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return MultipartObjectInfo{}, err
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}
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return info, nil
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}
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// Return ObjectInfo.
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func (xl xlObjects) getObjectInfo(bucket, object string) (ObjectInfo, error) {
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// First see if the object was a simple-PUT upload.
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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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return ObjectInfo{}, err
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}
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var info MultipartObjectInfo
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// Check if the object was multipart upload.
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info, err = getMultipartObjectInfo(xl.storage, bucket, object)
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if err != nil {
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return ObjectInfo{}, err
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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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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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// 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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nsMutex.RLock(bucket, object)
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defer nsMutex.RUnlock(bucket, object)
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info, err := xl.getObjectInfo(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 info, 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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// 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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// Verify bucket exists.
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if !isBucketExist(xl.storage, bucket) {
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return "", BucketNotFound{Bucket: bucket}
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}
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if !IsValidObjectName(object) {
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return "", ObjectNameInvalid{
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Bucket: bucket,
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Object: object,
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}
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}
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nsMutex.Lock(bucket, object)
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defer nsMutex.Unlock(bucket, object)
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tempObj := path.Join(tmpMetaPrefix, bucket, object)
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fileWriter, err := xl.storage.CreateFile(minioMetaBucket, tempObj)
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if err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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// Initialize md5 writer.
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md5Writer := md5.New()
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// Instantiate a new multi writer.
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multiWriter := io.MultiWriter(md5Writer, fileWriter)
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// Instantiate checksum hashers and create a multiwriter.
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if size > 0 {
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if _, err = io.CopyN(multiWriter, data, size); err != nil {
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if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
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return "", toObjectErr(clErr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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} else {
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if _, err = io.Copy(multiWriter, data); err != nil {
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if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
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return "", toObjectErr(clErr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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}
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newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
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// md5Hex representation.
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var md5Hex string
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if len(metadata) != 0 {
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md5Hex = metadata["md5Sum"]
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}
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if md5Hex != "" {
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if newMD5Hex != md5Hex {
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if err = safeCloseAndRemove(fileWriter); err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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return "", BadDigest{md5Hex, newMD5Hex}
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}
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}
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err = fileWriter.Close()
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if err != nil {
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if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
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return "", toObjectErr(clErr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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// check if an object is present as one of the parent dir.
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if err = xl.parentDirIsObject(bucket, path.Dir(object)); err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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// Delete if an object already exists.
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// FIXME: rename it to tmp file and delete only after
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// the newly uploaded file is renamed from tmp location to
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// the original location.
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err = xl.deleteObject(bucket, object)
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if err != nil && err != errFileNotFound {
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return "", toObjectErr(err, bucket, object)
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}
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err = xl.storage.RenameFile(minioMetaBucket, tempObj, bucket, object)
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if err != nil {
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if derr := xl.storage.DeleteFile(minioMetaBucket, tempObj); derr != nil {
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return "", toObjectErr(derr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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metadataBytes, err := json.Marshal(metadata)
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if err != nil {
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return newMD5Hex, nil
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}
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tempMetaJSONFile := path.Join(tmpMetaPrefix, bucket, object, "meta.json")
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fileWriter, err = xl.storage.CreateFile(minioMetaBucket, tempMetaJSONFile)
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if err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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if _, err = io.Copy(fileWriter, bytes.NewReader(metadataBytes)); err != nil {
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if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
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return "", toObjectErr(clErr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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if err = fileWriter.Close(); err != nil {
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if err = safeCloseAndRemove(fileWriter); err != nil {
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return "", toObjectErr(err, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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metaJSONFile := path.Join(object, "meta.json")
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err = xl.storage.RenameFile(minioMetaBucket, tempMetaJSONFile, bucket, metaJSONFile)
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if err != nil {
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if derr := xl.storage.DeleteFile(minioMetaBucket, tempMetaJSONFile); derr != nil {
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return "", toObjectErr(derr, bucket, object)
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}
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return "", toObjectErr(err, bucket, object)
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}
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// Return md5sum, successfully wrote object.
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return newMD5Hex, nil
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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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// Deletes and object.
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func (xl xlObjects) deleteObject(bucket, object string) error {
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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 err
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} else if !ok {
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metaJSONFile := path.Join(object, "meta.json")
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if err = xl.storage.DeleteFile(bucket, metaJSONFile); err != nil {
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return err
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}
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if err = xl.storage.DeleteFile(bucket, object); err != nil {
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return err
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}
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return nil
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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 err
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}
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// Range through all files and delete it.
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var wg = &sync.WaitGroup{}
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var errs = make([]error, len(info.Parts))
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for index, part := range info.Parts {
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wg.Add(1)
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// Start deleting parts in routine.
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go func(index int, part MultipartPartInfo) {
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defer wg.Done()
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partFileName := partNumToPartFileName(part.PartNumber)
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errs[index] = xl.storage.DeleteFile(bucket, pathJoin(object, partFileName))
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}(index, part)
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}
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// Wait for all the deletes to finish.
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wg.Wait()
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// Loop through and validate if any errors, if we are unable to remove any part return
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// "unexpected" error as returning any other error might be misleading. For ex.
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// if DeleteFile() had returned errFileNotFound and we return it, then client would see
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// ObjectNotFound which is misleading.
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for _, err := range errs {
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if err != nil {
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return errUnexpected
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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 err
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}
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return nil
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}
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// DeleteObject - delete the object.
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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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nsMutex.Lock(bucket, object)
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defer nsMutex.Unlock(bucket, object)
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if err := xl.deleteObject(bucket, object); 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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// ListObjects - list all objects at prefix, delimited by '/'.
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func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
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return listObjectsCommon(xl, bucket, prefix, marker, delimiter, maxKeys)
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}
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