mirror of https://github.com/minio/minio.git
512 lines
16 KiB
Go
512 lines
16 KiB
Go
/*
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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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"crypto/md5"
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"encoding/hex"
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"fmt"
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"io"
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"io/ioutil"
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"path"
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"strconv"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/skyrings/skyring-common/tools/uuid"
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)
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/// Common multipart object layer functions.
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// newMultipartUploadCommon - initialize a new multipart, is a common
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// function for both object layers.
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func newMultipartUploadCommon(storage StorageAPI, bucket string, object string) (uploadID string, err error) {
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// Verify if bucket name 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 if object name is valid.
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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 whether the bucket exists.
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if isExist, err := isBucketExist(storage, bucket); err != nil {
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return "", err
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} else if !isExist {
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return "", BucketNotFound{Bucket: bucket}
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}
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// Loops through until successfully generates a new unique upload id.
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for {
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uuid, err := uuid.New()
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if err != nil {
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return "", err
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}
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uploadID := uuid.String()
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uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
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tempUploadIDPath := path.Join(tmpMetaPrefix, bucket, object, uploadID)
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if _, err = storage.StatFile(minioMetaBucket, uploadIDPath); err != nil {
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if err != errFileNotFound {
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return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
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}
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// uploadIDPath doesn't exist, so create empty file to reserve the name
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var w io.WriteCloser
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if w, err = storage.CreateFile(minioMetaBucket, tempUploadIDPath); err != nil {
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return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
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}
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// Close the writer.
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if err = w.Close(); err != nil {
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return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
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}
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err = storage.RenameFile(minioMetaBucket, tempUploadIDPath, minioMetaBucket, uploadIDPath)
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if err != nil {
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return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
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}
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return uploadID, nil
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}
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// uploadIDPath already exists.
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// loop again to try with different uuid generated.
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}
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}
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// putObjectPartCommon - put object part.
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func putObjectPartCommon(storage StorageAPI, bucket string, object string, uploadID string, partID int, size int64, data io.Reader, md5Hex 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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if !IsValidObjectName(object) {
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return "", ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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// Verify whether the bucket exists.
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if isExist, err := isBucketExist(storage, bucket); err != nil {
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return "", err
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} else if !isExist {
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return "", BucketNotFound{Bucket: bucket}
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}
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if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
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return "", err
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} else if !status {
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return "", InvalidUploadID{UploadID: uploadID}
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}
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partSuffix := fmt.Sprintf("%s.%d", uploadID, partID)
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partSuffixPath := path.Join(tmpMetaPrefix, bucket, object, partSuffix)
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fileWriter, err := storage.CreateFile(minioMetaBucket, partSuffixPath)
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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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safeCloseAndRemove(fileWriter)
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return "", toObjectErr(err, bucket, object)
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}
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// Reader shouldn't have more data what mentioned in size argument.
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// reading one more byte from the reader to validate it.
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// expected to fail, success validates existence of more data in the reader.
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if _, err = io.CopyN(ioutil.Discard, data, 1); err == nil {
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safeCloseAndRemove(fileWriter)
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return "", UnExpectedDataSize{Size: int(size)}
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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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safeCloseAndRemove(fileWriter)
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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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if md5Hex != "" {
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if newMD5Hex != md5Hex {
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safeCloseAndRemove(fileWriter)
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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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return "", err
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}
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partSuffixMD5 := fmt.Sprintf("%s.%.5d.%s", uploadID, partID, newMD5Hex)
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partSuffixMD5Path := path.Join(mpartMetaPrefix, bucket, object, partSuffixMD5)
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err = storage.RenameFile(minioMetaBucket, partSuffixPath, minioMetaBucket, partSuffixMD5Path)
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if err != nil {
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return "", err
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}
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return newMD5Hex, nil
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}
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// Cleanup all temp entries inside tmpMetaPrefix directory, upon server initialization.
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func cleanupAllTmpEntries(storage StorageAPI) error {
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return cleanupUploadedParts(storage, tmpMetaPrefix, "", "", "")
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}
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// Wrapper to which removes all the uploaded parts after a successful
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// complete multipart upload.
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func cleanupUploadedParts(storage StorageAPI, prefix, bucket, object, uploadID string) error {
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markerPath := ""
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for {
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uploadIDPath := path.Join(prefix, bucket, object, uploadID)
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fileInfos, eof, err := storage.ListFiles(minioMetaBucket, uploadIDPath, markerPath, false, 1000)
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if err != nil {
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if err == errFileNotFound {
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return InvalidUploadID{UploadID: uploadID}
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}
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return toObjectErr(err)
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}
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for _, fileInfo := range fileInfos {
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storage.DeleteFile(minioMetaBucket, fileInfo.Name)
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markerPath = fileInfo.Name
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}
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if eof {
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break
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}
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}
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return nil
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}
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// abortMultipartUploadCommon - aborts a multipart upload, common
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// function used by both object layers.
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func abortMultipartUploadCommon(storage StorageAPI, bucket, object, uploadID 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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if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
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return err
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} else if !status {
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return InvalidUploadID{UploadID: uploadID}
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}
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return cleanupUploadedParts(storage, mpartMetaPrefix, bucket, object, uploadID)
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}
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// listLeafEntries - lists all entries if a given prefixPath is a leaf
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// directory, returns error if any - returns empty list if prefixPath
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// is not a leaf directory.
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func listLeafEntries(storage StorageAPI, prefixPath string) (entries []FileInfo, e error) {
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var markerPath string
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for {
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fileInfos, eof, err := storage.ListFiles(minioMetaBucket, prefixPath, markerPath, false, 1000)
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if err != nil {
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log.WithFields(logrus.Fields{
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"prefixPath": prefixPath,
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"markerPath": markerPath,
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}).Errorf("%s", err)
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return nil, err
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}
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for _, fileInfo := range fileInfos {
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// Set marker for next batch of ListFiles.
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markerPath = fileInfo.Name
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if fileInfo.Mode.IsDir() {
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// If a directory is found, doesn't return anything.
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return nil, nil
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}
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fileName := path.Base(fileInfo.Name)
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if !strings.Contains(fileName, ".") {
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// Skip the entry if it is of the pattern bucket/object/uploadID.partNum.md5sum
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// and retain entries of the pattern bucket/object/uploadID
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entries = append(entries, fileInfo)
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}
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}
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if eof {
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break
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}
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}
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return entries, nil
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}
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// listMetaBucketMultipartFiles - list all files at a given prefix inside minioMetaBucket.
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func listMetaBucketMultipartFiles(storage StorageAPI, prefixPath string, markerPath string, recursive bool, maxKeys int) (allFileInfos []FileInfo, eof bool, err error) {
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// newMaxKeys tracks the size of entries which are going to be
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// returned back.
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var newMaxKeys int
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// Following loop gathers and filters out special files inside
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// minio meta volume.
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for {
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var fileInfos []FileInfo
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// List files up to maxKeys-newMaxKeys, since we are skipping
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// entries for special files.
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fileInfos, eof, err = storage.ListFiles(minioMetaBucket, prefixPath, markerPath, recursive, maxKeys-newMaxKeys)
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if err != nil {
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log.WithFields(logrus.Fields{
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"prefixPath": prefixPath,
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"markerPath": markerPath,
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"recursive": recursive,
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"maxKeys": maxKeys,
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}).Errorf("%s", err)
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return nil, true, err
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}
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// Loop through and validate individual file.
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for _, fi := range fileInfos {
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var entries []FileInfo
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if fi.Mode.IsDir() {
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// List all the entries if fi.Name is a leaf directory, if
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// fi.Name is not a leaf directory then the resulting
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// entries are empty.
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entries, err = listLeafEntries(storage, fi.Name)
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if err != nil {
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log.WithFields(logrus.Fields{
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"prefixPath": fi.Name,
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}).Errorf("%s", err)
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return nil, false, err
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}
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}
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// Set markerPath for next batch of listing.
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markerPath = fi.Name
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if len(entries) > 0 {
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// We reach here for non-recursive case and a leaf entry.
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for _, entry := range entries {
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allFileInfos = append(allFileInfos, entry)
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newMaxKeys++
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// If we have reached the maxKeys, it means we have listed
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// everything that was requested. Return right here.
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if newMaxKeys == maxKeys {
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// Return values:
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// allFileInfos : "maxKeys" number of entries.
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// eof : eof returned by fs.storage.ListFiles()
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// error : nil
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return
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}
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}
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} else {
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// We reach here for a non-recursive case non-leaf entry
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// OR recursive case with fi.Name matching pattern bucket/object/uploadID[.partNum.md5sum]
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if !fi.Mode.IsDir() { // Do not skip non-recursive case directory entries.
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// Skip files matching pattern bucket/object/uploadID.partNum.md5sum
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// and retain files matching pattern bucket/object/uploadID
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specialFile := path.Base(fi.Name)
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if strings.Contains(specialFile, ".") {
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// Contains partnumber and md5sum info, skip this.
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continue
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}
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}
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allFileInfos = append(allFileInfos, fi)
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newMaxKeys++
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// If we have reached the maxKeys, it means we have listed
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// everything that was requested. Return right here.
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if newMaxKeys == maxKeys {
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// Return values:
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// allFileInfos : "maxKeys" number of entries.
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// eof : eof returned by fs.storage.ListFiles()
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// error : nil
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return
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}
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}
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}
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// If we have reached eof then we break out.
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if eof {
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break
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}
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}
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// Return entries here.
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return allFileInfos, eof, nil
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}
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// listMultipartUploadsCommon - lists all multipart uploads, common
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// function for both object layers.
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func listMultipartUploadsCommon(storage StorageAPI, bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
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result := ListMultipartsInfo{}
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ListMultipartsInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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if !IsValidObjectPrefix(prefix) {
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return ListMultipartsInfo{}, 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 ListMultipartsInfo{}, 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 keyMarker != "" && !strings.HasPrefix(keyMarker, prefix) {
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return ListMultipartsInfo{}, InvalidMarkerPrefixCombination{
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Marker: keyMarker,
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Prefix: prefix,
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}
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}
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if uploadIDMarker != "" {
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if strings.HasSuffix(keyMarker, slashSeparator) {
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return result, InvalidUploadIDKeyCombination{
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UploadIDMarker: uploadIDMarker,
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KeyMarker: keyMarker,
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}
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}
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id, err := uuid.Parse(uploadIDMarker)
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if err != nil {
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return result, err
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}
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if id.IsZero() {
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return result, MalformedUploadID{
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UploadID: uploadIDMarker,
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}
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}
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}
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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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result.IsTruncated = true
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result.MaxUploads = maxUploads
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// Not using path.Join() as it strips off the trailing '/'.
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// Also bucket should always be followed by '/' even if prefix is empty.
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multipartPrefixPath := pathJoin(mpartMetaPrefix, pathJoin(bucket, prefix))
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multipartMarkerPath := ""
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if keyMarker != "" {
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keyMarkerPath := pathJoin(pathJoin(bucket, keyMarker), uploadIDMarker)
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multipartMarkerPath = pathJoin(mpartMetaPrefix, keyMarkerPath)
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}
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// List all the multipart files at prefixPath, starting with marker keyMarkerPath.
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fileInfos, eof, err := listMetaBucketMultipartFiles(storage, multipartPrefixPath, multipartMarkerPath, recursive, maxUploads)
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if err != nil {
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log.WithFields(logrus.Fields{
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"prefixPath": multipartPrefixPath,
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"markerPath": multipartMarkerPath,
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"recursive": recursive,
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"maxUploads": maxUploads,
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}).Errorf("listMetaBucketMultipartFiles failed with %s", err)
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return ListMultipartsInfo{}, err
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}
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// Loop through all the received files fill in the multiparts result.
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for _, fi := range fileInfos {
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var objectName string
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var uploadID string
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if fi.Mode.IsDir() {
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// All directory entries are common prefixes.
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uploadID = "" // Upload ids are empty for CommonPrefixes.
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objectName = strings.TrimPrefix(fi.Name, retainSlash(path.Join(mpartMetaPrefix, bucket)))
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result.CommonPrefixes = append(result.CommonPrefixes, objectName)
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} else {
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uploadID = path.Base(fi.Name)
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objectName = strings.TrimPrefix(path.Dir(fi.Name), retainSlash(path.Join(mpartMetaPrefix, bucket)))
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result.Uploads = append(result.Uploads, uploadMetadata{
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Object: objectName,
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UploadID: uploadID,
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Initiated: fi.ModTime,
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})
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}
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result.NextKeyMarker = objectName
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result.NextUploadIDMarker = uploadID
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}
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result.IsTruncated = !eof
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if !result.IsTruncated {
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result.NextKeyMarker = ""
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result.NextUploadIDMarker = ""
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}
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return result, nil
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}
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// ListObjectParts - list object parts, common function across both
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// object layers.
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func listObjectPartsCommon(storage StorageAPI, bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
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// Verify if bucket is valid.
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if !IsValidBucketName(bucket) {
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return ListPartsInfo{}, BucketNameInvalid{Bucket: bucket}
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}
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if !IsValidObjectName(object) {
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return ListPartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
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}
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if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
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return ListPartsInfo{}, err
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} else if !status {
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return ListPartsInfo{}, InvalidUploadID{UploadID: uploadID}
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}
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result := ListPartsInfo{}
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var markerPath string
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nextPartNumberMarker := 0
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uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
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// Figure out the marker for the next subsequent calls, if the
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// partNumberMarker is already set.
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if partNumberMarker > 0 {
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partNumberMarkerPath := uploadIDPath + "." + fmt.Sprintf("%.5d", partNumberMarker) + "."
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fileInfos, _, err := storage.ListFiles(minioMetaBucket, partNumberMarkerPath, "", false, 1)
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if err != nil {
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return result, toObjectErr(err, minioMetaBucket, partNumberMarkerPath)
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}
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if len(fileInfos) == 0 {
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return result, InvalidPart{}
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}
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markerPath = fileInfos[0].Name
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}
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uploadIDPrefix := uploadIDPath + "."
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fileInfos, eof, err := storage.ListFiles(minioMetaBucket, uploadIDPrefix, markerPath, false, maxParts)
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if err != nil {
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return result, InvalidPart{}
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}
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for _, fileInfo := range fileInfos {
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fileName := path.Base(fileInfo.Name)
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splitResult := strings.Split(fileName, ".")
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partNum, err := strconv.Atoi(splitResult[1])
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if err != nil {
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return result, err
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}
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md5sum := splitResult[2]
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result.Parts = append(result.Parts, partInfo{
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PartNumber: partNum,
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LastModified: fileInfo.ModTime,
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ETag: md5sum,
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Size: fileInfo.Size,
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})
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nextPartNumberMarker = partNum
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}
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result.Bucket = bucket
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result.Object = object
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result.UploadID = uploadID
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result.PartNumberMarker = partNumberMarker
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result.NextPartNumberMarker = nextPartNumberMarker
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result.MaxParts = maxParts
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result.IsTruncated = !eof
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return result, nil
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}
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// isUploadIDExists - verify if a given uploadID exists and is valid.
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func isUploadIDExists(storage StorageAPI, bucket, object, uploadID string) (bool, error) {
|
|
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
|
|
st, err := storage.StatFile(minioMetaBucket, uploadIDPath)
|
|
if err != nil {
|
|
// Upload id does not exist.
|
|
if err == errFileNotFound {
|
|
return false, nil
|
|
}
|
|
return false, err
|
|
}
|
|
// Upload id exists and is a regular file.
|
|
return st.Mode.IsRegular(), nil
|
|
}
|