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212 lines
7.2 KiB
212 lines
7.2 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 cmd
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import (
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"errors"
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"reflect"
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"sync"
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"time"
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)
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// Error sent by appendParts go-routine when there are holes in parts.
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// For ex. let's say client uploads part-2 before part-1 in which case we
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// can not append and have to wait till part-1 is uploaded. Hence we return
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// this error. Currently this error is not used in the caller.
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var errPartsMissing = errors.New("required parts missing")
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// Error sent when appendParts go-routine has waited long enough and timedout.
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var errAppendPartsTimeout = errors.New("appendParts goroutine timeout")
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// Timeout value for the appendParts go-routine.
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var appendPartsTimeout = 24 * 60 * 60 * time.Second // 24 hours.
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// Holds a map of uploadID->appendParts go-routine
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type backgroundAppend struct {
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infoMap map[string]bgAppendPartsInfo
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sync.Mutex
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}
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// Input to the appendParts go-routine
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type bgAppendPartsInput struct {
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meta fsMetaV1 // list of parts that need to be appended
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errCh chan error // error sent by appendParts go-routine
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}
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// Identifies an appendParts go-routine.
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type bgAppendPartsInfo struct {
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inputCh chan bgAppendPartsInput
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timeoutCh chan struct{} // closed by appendParts go-routine when it timesout
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abortCh chan struct{} // closed after abort of upload to end the appendParts go-routine
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completeCh chan struct{} // closed after complete of upload to end the appendParts go-routine
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}
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// Called after a part is uploaded so that it can be appended in the background.
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func (b *backgroundAppend) append(disk StorageAPI, bucket, object, uploadID string, meta fsMetaV1) chan error {
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b.Lock()
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info, ok := b.infoMap[uploadID]
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if !ok {
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// Corresponding appendParts go-routine was not found, create a new one. Would happen when the first
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// part of a multipart upload is uploaded.
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inputCh := make(chan bgAppendPartsInput)
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timeoutCh := make(chan struct{})
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abortCh := make(chan struct{})
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completeCh := make(chan struct{})
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info = bgAppendPartsInfo{inputCh, timeoutCh, abortCh, completeCh}
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b.infoMap[uploadID] = info
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go b.appendParts(disk, bucket, object, uploadID, info)
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}
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b.Unlock()
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errCh := make(chan error)
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go func() {
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// send input in a goroutine as send on the inputCh can block if appendParts go-routine
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// is busy appending a part.
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select {
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case <-info.timeoutCh:
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// This is to handle a rare race condition where we found info in b.infoMap
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// but soon after that appendParts go-routine timed out.
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errCh <- errAppendPartsTimeout
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case info.inputCh <- bgAppendPartsInput{meta, errCh}:
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}
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}()
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return errCh
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}
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// Called on complete-multipart-upload. Returns nil if the required parts have been appended.
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func (b *backgroundAppend) complete(disk StorageAPI, bucket, object, uploadID string, meta fsMetaV1) error {
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b.Lock()
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info, ok := b.infoMap[uploadID]
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delete(b.infoMap, uploadID)
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b.Unlock()
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if !ok {
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return errPartsMissing
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}
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errCh := make(chan error)
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select {
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case <-info.timeoutCh:
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// This is to handle a rare race condition where we found info in b.infoMap
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// but soon after that appendParts go-routine timedouted out.
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return errAppendPartsTimeout
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case info.inputCh <- bgAppendPartsInput{meta, errCh}:
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}
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err := <-errCh
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close(info.completeCh)
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return err
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}
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// Called after complete-multipart-upload or abort-multipart-upload so that the appendParts go-routine is not left dangling.
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func (b *backgroundAppend) abort(uploadID string) {
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b.Lock()
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info, ok := b.infoMap[uploadID]
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if !ok {
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b.Unlock()
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return
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}
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delete(b.infoMap, uploadID)
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b.Unlock()
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info.abortCh <- struct{}{}
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}
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// This is run as a go-routine that appends the parts in the background.
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func (b *backgroundAppend) appendParts(disk StorageAPI, bucket, object, uploadID string, info bgAppendPartsInfo) {
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// Holds the list of parts that is already appended to the "append" file.
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appendMeta := fsMetaV1{}
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for {
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select {
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case input := <-info.inputCh:
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// We receive on this channel when new part gets uploaded or when complete-multipart sends
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// a value on this channel to confirm if all the required parts are appended.
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meta := input.meta
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for {
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// Append should be done such a way that if part-3 and part-2 is uploaded before part-1, we
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// wait till part-1 is uploaded after which we append part-2 and part-3 as well in this for-loop.
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part, appendNeeded := partToAppend(meta, appendMeta)
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if !appendNeeded {
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if reflect.DeepEqual(meta.Parts, appendMeta.Parts) {
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// Sending nil is useful so that the complete-multipart-upload knows that
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// all the required parts have been appended.
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input.errCh <- nil
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} else {
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// Sending error is useful so that complete-multipart-upload can fall-back to
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// its own append process.
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input.errCh <- errPartsMissing
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}
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break
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}
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if err := appendPart(disk, bucket, object, uploadID, part); err != nil {
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disk.DeleteFile(minioMetaTmpBucket, uploadID)
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appendMeta.Parts = nil
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input.errCh <- err
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break
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}
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appendMeta.AddObjectPart(part.Number, part.Name, part.ETag, part.Size)
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}
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case <-info.abortCh:
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// abort-multipart-upload closed abortCh to end the appendParts go-routine.
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disk.DeleteFile(minioMetaTmpBucket, uploadID)
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return
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case <-info.completeCh:
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// complete-multipart-upload closed completeCh to end the appendParts go-routine.
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return
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case <-time.After(appendPartsTimeout):
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// Timeout the goroutine to garbage collect its resources. This would happen if the client initiates
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// a multipart upload and does not complete/abort it.
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b.Lock()
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delete(b.infoMap, uploadID)
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b.Unlock()
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// Delete the temporary append file as well.
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disk.DeleteFile(minioMetaTmpBucket, uploadID)
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close(info.timeoutCh)
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return
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}
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}
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}
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// Appends the "part" to the append-file inside "tmp/" that finally gets moved to the actual location
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// upon complete-multipart-upload.
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func appendPart(disk StorageAPI, bucket, object, uploadID string, part objectPartInfo) error {
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partPath := pathJoin(bucket, object, uploadID, part.Name)
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offset := int64(0)
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totalLeft := part.Size
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buf := make([]byte, readSizeV1)
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for totalLeft > 0 {
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curLeft := int64(readSizeV1)
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if totalLeft < readSizeV1 {
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curLeft = totalLeft
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}
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n, err := disk.ReadFile(minioMetaMultipartBucket, partPath, offset, buf[:curLeft])
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if err != nil {
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// Check for EOF/ErrUnexpectedEOF not needed as it should never happen as we know
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// the exact size of the file and hence know the size of buf[]
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// EOF/ErrUnexpectedEOF indicates that the length of file was shorter than part.Size and
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// hence considered as an error condition.
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return err
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}
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if err = disk.AppendFile(minioMetaTmpBucket, uploadID, buf[:n]); err != nil {
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return err
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}
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offset += n
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totalLeft -= n
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}
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return nil
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}
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