632 lines
20 KiB
Go
632 lines
20 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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"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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"time"
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"github.com/minio/minio/pkg/mimedb"
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"github.com/minio/minio/pkg/objcache"
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)
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/// Object Operations
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// GetObject - reads an object erasured coded across multiple
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// disks. Supports additional parameters like offset and length
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// which is synonymous with HTTP Range requests.
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//
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// startOffset indicates the location at which the client requested
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// object to be read at. length indicates the total length of the
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// object requested by client.
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func (xl xlObjects) GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) 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 if object 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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// Start offset and length cannot be negative.
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if startOffset < 0 || length < 0 {
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return toObjectErr(errUnexpected, bucket, object)
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}
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// Writer cannot be nil.
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if writer == nil {
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return toObjectErr(errUnexpected, bucket, object)
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}
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// Lock the object before reading.
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nsMutex.RLock(bucket, object)
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defer nsMutex.RUnlock(bucket, object)
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// Read metadata associated with the object from all disks.
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metaArr, errs := readAllXLMetadata(xl.storageDisks, bucket, object)
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// Do we have read quorum?
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if !isDiskQuorum(errs, xl.readQuorum) {
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return toObjectErr(errXLReadQuorum, bucket, object)
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}
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// If all the disks returned error, we return error.
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if errCount, err := reduceErrs(errs); err != nil {
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if errCount < xl.readQuorum {
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return toObjectErr(errXLReadQuorum, bucket, object)
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}
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return toObjectErr(err, bucket, object)
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}
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// List all online disks.
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onlineDisks, modTime := xl.listOnlineDisks(metaArr, errs)
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// Pick latest valid metadata.
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var xlMeta xlMetaV1
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for _, meta := range metaArr {
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if meta.IsValid() && meta.Stat.ModTime == modTime {
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xlMeta = meta
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break
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}
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}
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// Reply back invalid range if the input offset and length fall out of range.
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if startOffset > xlMeta.Stat.Size || length > xlMeta.Stat.Size {
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return InvalidRange{startOffset, length, xlMeta.Stat.Size}
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}
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// Reply if we have inputs with offset and length.
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if startOffset+length > xlMeta.Stat.Size {
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return InvalidRange{startOffset, length, xlMeta.Stat.Size}
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}
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// Get start part index and offset.
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partIndex, partOffset, err := xlMeta.ObjectToPartOffset(startOffset)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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// Get last part index to read given length.
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lastPartIndex, _, err := xlMeta.ObjectToPartOffset(startOffset + length - 1)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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// Collect all the previous erasure infos across the disk.
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var eInfos []erasureInfo
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for index := range onlineDisks {
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eInfos = append(eInfos, metaArr[index].Erasure)
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}
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// Save the writer.
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mw := writer
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// Object cache enabled block.
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if xlMeta.Stat.Size > 0 && xl.objCacheEnabled {
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// Validate if we have previous cache.
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cachedBuffer, err := xl.objCache.Open(path.Join(bucket, object))
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if err == nil { // Cache hit.
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// Advance the buffer to offset as if it was read.
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if _, err = cachedBuffer.Seek(startOffset, 0); err != nil { // Seek to the offset.
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return err
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}
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// Write the requested length.
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if _, err = io.CopyN(writer, cachedBuffer, length); err != nil {
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return err
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}
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return nil
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} // Cache miss.
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// For unknown error, return and error out.
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if err != objcache.ErrKeyNotFoundInCache {
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return err
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} // Cache has not been found, fill the cache.
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// Cache is only set if whole object is being read.
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if startOffset == 0 && length == xlMeta.Stat.Size {
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// Proceed to set the cache.
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var newBuffer io.WriteCloser
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// Create a new entry in memory of length.
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newBuffer, err = xl.objCache.Create(path.Join(bucket, object), length)
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if err == nil {
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// Create a multi writer to write to both memory and client response.
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mw = io.MultiWriter(newBuffer, writer)
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defer newBuffer.Close()
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}
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// Ignore error if cache is full, proceed to write the object.
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if err != nil && err != objcache.ErrCacheFull {
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// For any other error return here.
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return toObjectErr(err, bucket, object)
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}
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}
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}
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totalBytesRead := int64(0)
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// Read from all parts.
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for ; partIndex <= lastPartIndex; partIndex++ {
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if length == totalBytesRead {
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break
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}
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// Save the current part name and size.
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partName := xlMeta.Parts[partIndex].Name
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partSize := xlMeta.Parts[partIndex].Size
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readSize := partSize - partOffset
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// readSize should be adjusted so that we don't write more data than what was requested.
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if readSize > (length - totalBytesRead) {
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readSize = length - totalBytesRead
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}
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// Start reading the part name.
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n, err := erasureReadFile(mw, onlineDisks, bucket, pathJoin(object, partName), partName, eInfos, partOffset, readSize, partSize)
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if err != nil {
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return toObjectErr(err, bucket, object)
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}
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totalBytesRead += n
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// partOffset will be valid only for the first part, hence reset it to 0 for
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// the remaining parts.
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partOffset = 0
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} // End of read all parts loop.
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// Return success.
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return nil
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}
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// GetObjectInfo - reads object metadata and replies back ObjectInfo.
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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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// getObjectInfo - wrapper for reading object metadata and constructs ObjectInfo.
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func (xl xlObjects) getObjectInfo(bucket, object string) (objInfo ObjectInfo, err error) {
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var xlMeta xlMetaV1
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xlMeta, err = xl.readXLMetadata(bucket, object)
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if err != nil {
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// Return error.
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return ObjectInfo{}, err
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}
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objInfo = ObjectInfo{
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IsDir: false,
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Bucket: bucket,
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Name: object,
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Size: xlMeta.Stat.Size,
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ModTime: xlMeta.Stat.ModTime,
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MD5Sum: xlMeta.Meta["md5Sum"],
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ContentType: xlMeta.Meta["content-type"],
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ContentEncoding: xlMeta.Meta["content-encoding"],
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UserDefined: xlMeta.Meta,
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}
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return objInfo, nil
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}
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func undoRename(disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, isPart bool, errs []error, writeQuorum, readQuorum int) {
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var wg = &sync.WaitGroup{}
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// Undo rename object on disks where RenameFile succeeded.
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// If srcEntry/dstEntry are objects then add a trailing slash to copy
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// over all the parts inside the object directory
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if !isPart {
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srcEntry = retainSlash(srcEntry)
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dstEntry = retainSlash(dstEntry)
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}
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for index, disk := range disks {
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if disk == nil {
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continue
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}
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// Undo rename object in parallel.
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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if errs[index] != nil {
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return
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}
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_ = disk.RenameFile(dstBucket, dstEntry, srcBucket, srcEntry)
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}(index, disk)
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}
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wg.Wait()
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}
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// undoRenameObject - renames back the partially successful rename operations.
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func undoRenameObject(disks []StorageAPI, srcBucket, srcObject, dstBucket, dstObject string, errs []error, writeQuorum, readQuorum int) {
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isPart := false
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undoRename(disks, srcBucket, srcObject, dstBucket, dstObject, isPart, errs, writeQuorum, readQuorum)
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}
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// undoRenamePart - renames back the partially successful rename operation.
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func undoRenamePart(disks []StorageAPI, srcBucket, srcPart, dstBucket, dstPart string, errs []error, writeQuorum, readQuorum int) {
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isPart := true
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undoRename(disks, srcBucket, srcPart, dstBucket, dstPart, isPart, errs, writeQuorum, readQuorum)
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}
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// rename - common function that renamePart and renameObject use to rename
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// the respective underlying storage layer representations.
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func rename(disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, isPart bool, writeQuorum, readQuorum int) error {
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// Initialize sync waitgroup.
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var wg = &sync.WaitGroup{}
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// Initialize list of errors.
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var errs = make([]error, len(disks))
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if !isPart {
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dstEntry = retainSlash(dstEntry)
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srcEntry = retainSlash(srcEntry)
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}
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// Rename file on all underlying storage disks.
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for index, disk := range disks {
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if disk == nil {
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errs[index] = errDiskNotFound
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continue
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}
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wg.Add(1)
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go func(index int, disk StorageAPI) {
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defer wg.Done()
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err := disk.RenameFile(srcBucket, srcEntry, dstBucket, dstEntry)
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if err != nil && err != errFileNotFound {
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errs[index] = err
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}
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}(index, disk)
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}
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// Wait for all renames to finish.
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wg.Wait()
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// We can safely allow RenameFile errors up to len(xl.storageDisks) - xl.writeQuorum
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// otherwise return failure. Cleanup successful renames.
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if !isDiskQuorum(errs, writeQuorum) {
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// Check we have successful read quorum.
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if isDiskQuorum(errs, readQuorum) {
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return nil // Return success.
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} // else - failed to acquire read quorum.
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// Undo all the partial rename operations.
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undoRename(disks, srcBucket, srcEntry, dstBucket, dstEntry, isPart, errs, writeQuorum, readQuorum)
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return errXLWriteQuorum
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}
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// Return on first error, also undo any partially successful rename operations.
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if errCount, reducedErr := reduceErrs(errs); reducedErr != nil {
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if errCount < writeQuorum {
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// Undo all the partial rename operations.
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undoRename(disks, srcBucket, srcEntry, dstBucket, dstEntry, isPart, errs, writeQuorum, readQuorum)
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return errXLWriteQuorum
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}
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if isErrIgnored(reducedErr, []error{
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errDiskNotFound,
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errDiskAccessDenied,
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errFaultyDisk,
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errVolumeNotFound,
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}) {
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// Return success.
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return nil
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}
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return reducedErr
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}
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return nil
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}
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// renamePart - renames a part of the source object to the destination
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// across all disks in parallel. Additionally if we have errors and do
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// not have a readQuorum partially renamed files are renamed back to
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// its proper location.
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func renamePart(disks []StorageAPI, srcBucket, srcPart, dstBucket, dstPart string, writeQuorum, readQuorum int) error {
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isPart := true
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return rename(disks, srcBucket, srcPart, dstBucket, dstPart, isPart, writeQuorum, readQuorum)
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}
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// renameObject - renames all source objects to destination object
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// across all disks in parallel. Additionally if we have errors and do
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// not have a readQuorum partially renamed files are renamed back to
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// its proper location.
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func renameObject(disks []StorageAPI, srcBucket, srcObject, dstBucket, dstObject string, writeQuorum, readQuorum int) error {
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isPart := false
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return rename(disks, srcBucket, srcObject, dstBucket, dstObject, isPart, writeQuorum, readQuorum)
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}
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// PutObject - creates an object upon reading from the input stream
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// until EOF, erasure codes the data across all disk and additionally
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// writes `xl.json` which carries the necessary metadata for future
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// object operations.
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func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (md5Sum string, err 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 !xl.isBucketExist(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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// No metadata is set, allocate a new one.
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if metadata == nil {
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metadata = make(map[string]string)
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}
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uniqueID := getUUID()
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tempErasureObj := path.Join(tmpMetaPrefix, uniqueID, "part.1")
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minioMetaTmpBucket := path.Join(minioMetaBucket, tmpMetaPrefix)
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tempObj := uniqueID
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nsMutex.RLock(bucket, object)
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// Read metadata associated with the object from all disks.
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partsMetadata, errs := readAllXLMetadata(xl.storageDisks, bucket, object)
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nsMutex.RUnlock(bucket, object)
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// Do we have write quroum?.
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if !isDiskQuorum(errs, xl.writeQuorum) {
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return "", toObjectErr(errXLWriteQuorum, bucket, object)
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}
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// errFileNotFound is handled specially since it's OK for the object to
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// not exists in the namespace yet.
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if errCount, reducedErr := reduceErrs(errs); reducedErr != nil && reducedErr != errFileNotFound {
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if errCount < xl.writeQuorum {
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return "", toObjectErr(errXLWriteQuorum, bucket, object)
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}
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return "", toObjectErr(reducedErr, bucket, object)
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}
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// List all online disks.
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onlineDisks, _ := xl.listOnlineDisks(partsMetadata, errs)
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var mw io.Writer
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// Initialize md5 writer.
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md5Writer := md5.New()
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// Proceed to set the cache.
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var newBuffer io.WriteCloser
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// If caching is enabled, proceed to set the cache.
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if size > 0 && xl.objCacheEnabled {
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// PutObject invalidates any previously cached object in memory.
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xl.objCache.Delete(path.Join(bucket, object))
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// Create a new entry in memory of size.
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newBuffer, err = xl.objCache.Create(path.Join(bucket, object), size)
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if err == nil {
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// Create a multi writer to write to both memory and client response.
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mw = io.MultiWriter(newBuffer, md5Writer)
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}
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// Ignore error if cache is full, proceed to write the object.
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if err != nil && err != objcache.ErrCacheFull {
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// For any other error return here.
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return "", toObjectErr(err, bucket, object)
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}
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} else {
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mw = md5Writer
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}
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// Limit the reader to its provided size if specified.
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var limitDataReader io.Reader
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if size > 0 {
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// This is done so that we can avoid erroneous clients sending
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// more data than the set content size.
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limitDataReader = io.LimitReader(data, size)
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} else {
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// else we read till EOF.
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limitDataReader = data
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}
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// Tee reader combines incoming data stream and md5, data read from input stream is written to md5.
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teeReader := io.TeeReader(limitDataReader, mw)
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// Initialize xl meta.
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xlMeta := newXLMetaV1(object, xl.dataBlocks, xl.parityBlocks)
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// Collect all the previous erasure infos across the disk.
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var eInfos []erasureInfo
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for range onlineDisks {
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eInfos = append(eInfos, xlMeta.Erasure)
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}
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// Erasure code and write across all disks.
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newEInfos, sizeWritten, err := erasureCreateFile(onlineDisks, minioMetaBucket, tempErasureObj, "part.1", teeReader, eInfos, xl.writeQuorum)
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if err != nil {
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return "", toObjectErr(err, minioMetaBucket, tempErasureObj)
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}
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// For size == -1, perhaps client is sending in chunked encoding
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// set the size as size that was actually written.
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if size == -1 {
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size = sizeWritten
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}
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// Save additional erasureMetadata.
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modTime := time.Now().UTC()
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newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
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// Update the md5sum if not set with the newly calculated one.
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if len(metadata["md5Sum"]) == 0 {
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metadata["md5Sum"] = newMD5Hex
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}
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// Guess content-type from the extension if possible.
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if metadata["content-type"] == "" {
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if objectExt := filepath.Ext(object); objectExt != "" {
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if content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]; ok {
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metadata["content-type"] = content.ContentType
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}
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}
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}
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// Validate if payload is valid.
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if isSignVerify(data) {
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if vErr := data.(*signVerifyReader).Verify(); vErr != nil {
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// Incoming payload wrong, delete the temporary object.
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xl.deleteObject(minioMetaTmpBucket, tempObj)
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// Error return.
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return "", toObjectErr(vErr, bucket, object)
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}
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}
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// md5Hex representation.
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md5Hex := metadata["md5Sum"]
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if md5Hex != "" {
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if newMD5Hex != md5Hex {
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// MD5 mismatch, delete the temporary object.
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xl.deleteObject(minioMetaTmpBucket, tempObj)
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// Returns md5 mismatch.
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|
return "", BadDigest{md5Hex, newMD5Hex}
|
|
}
|
|
}
|
|
|
|
// Lock the object.
|
|
nsMutex.Lock(bucket, object)
|
|
defer nsMutex.Unlock(bucket, object)
|
|
|
|
// Check if an object is present as one of the parent dir.
|
|
// -- FIXME. (needs a new kind of lock).
|
|
if xl.parentDirIsObject(bucket, path.Dir(object)) {
|
|
return "", toObjectErr(errFileAccessDenied, bucket, object)
|
|
}
|
|
|
|
// Rename if an object already exists to temporary location.
|
|
newUniqueID := getUUID()
|
|
if xl.isObject(bucket, object) {
|
|
err = renameObject(xl.storageDisks, bucket, object, minioMetaTmpBucket, newUniqueID, xl.writeQuorum, xl.readQuorum)
|
|
if err != nil {
|
|
return "", toObjectErr(err, bucket, object)
|
|
}
|
|
}
|
|
|
|
// Fill all the necessary metadata.
|
|
xlMeta.Meta = metadata
|
|
xlMeta.Stat.Size = size
|
|
xlMeta.Stat.ModTime = modTime
|
|
|
|
// Add the final part.
|
|
xlMeta.AddObjectPart(1, "part.1", newMD5Hex, xlMeta.Stat.Size)
|
|
|
|
// Update `xl.json` content on each disks.
|
|
for index := range partsMetadata {
|
|
partsMetadata[index] = xlMeta
|
|
partsMetadata[index].Erasure = newEInfos[index]
|
|
}
|
|
|
|
// Write unique `xl.json` for each disk.
|
|
if err = writeUniqueXLMetadata(onlineDisks, minioMetaTmpBucket, tempObj, partsMetadata, xl.writeQuorum, xl.readQuorum); err != nil {
|
|
return "", toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Rename the successfully written temporary object to final location.
|
|
err = renameObject(onlineDisks, minioMetaTmpBucket, tempObj, bucket, object, xl.writeQuorum, xl.readQuorum)
|
|
if err != nil {
|
|
return "", toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Delete the temporary object.
|
|
xl.deleteObject(minioMetaTmpBucket, newUniqueID)
|
|
|
|
// Once we have successfully renamed the object, Close the buffer which would
|
|
// save the object on cache.
|
|
if size > 0 && xl.objCacheEnabled && newBuffer != nil {
|
|
newBuffer.Close()
|
|
}
|
|
|
|
// Return md5sum, successfully wrote object.
|
|
return newMD5Hex, nil
|
|
}
|
|
|
|
// deleteObject - wrapper for delete object, deletes an object from
|
|
// all the disks in parallel, including `xl.json` associated with the
|
|
// object.
|
|
func (xl xlObjects) deleteObject(bucket, object string) error {
|
|
// Initialize sync waitgroup.
|
|
var wg = &sync.WaitGroup{}
|
|
|
|
// Initialize list of errors.
|
|
var dErrs = make([]error, len(xl.storageDisks))
|
|
|
|
for index, disk := range xl.storageDisks {
|
|
if disk == nil {
|
|
dErrs[index] = errDiskNotFound
|
|
continue
|
|
}
|
|
wg.Add(1)
|
|
go func(index int, disk StorageAPI) {
|
|
defer wg.Done()
|
|
err := cleanupDir(disk, bucket, object)
|
|
if err != nil && err != errFileNotFound {
|
|
dErrs[index] = err
|
|
}
|
|
}(index, disk)
|
|
}
|
|
|
|
// Wait for all routines to finish.
|
|
wg.Wait()
|
|
|
|
// Do we have write quorum?
|
|
if !isDiskQuorum(dErrs, xl.writeQuorum) {
|
|
// Return errXLWriteQuorum if errors were more than allowed write quorum.
|
|
return errXLWriteQuorum
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DeleteObject - deletes an object, this call doesn't necessary reply
|
|
// any error as it is not necessary for the handler to reply back a
|
|
// response to the client request.
|
|
func (xl xlObjects) DeleteObject(bucket, object string) (err error) {
|
|
// Verify if bucket is valid.
|
|
if !IsValidBucketName(bucket) {
|
|
return BucketNameInvalid{Bucket: bucket}
|
|
}
|
|
if !IsValidObjectName(object) {
|
|
return ObjectNameInvalid{Bucket: bucket, Object: object}
|
|
}
|
|
nsMutex.Lock(bucket, object)
|
|
defer nsMutex.Unlock(bucket, object)
|
|
|
|
// Validate object exists.
|
|
if !xl.isObject(bucket, object) {
|
|
return ObjectNotFound{bucket, object}
|
|
} // else proceed to delete the object.
|
|
|
|
// Delete the object on all disks.
|
|
err = xl.deleteObject(bucket, object)
|
|
if err != nil {
|
|
return toObjectErr(err, bucket, object)
|
|
}
|
|
|
|
// Delete from the cache.
|
|
xl.objCache.Delete(pathJoin(bucket, object))
|
|
|
|
// Success.
|
|
return nil
|
|
}
|