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462 lines
12 KiB
Go
462 lines
12 KiB
Go
package oss
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import (
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"crypto/md5"
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"encoding/base64"
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"encoding/json"
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"errors"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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)
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//
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// CopyFile 分片复制文件
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//
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// srcBucketName 源Bucket名称。
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// srcObjectKey 源Object名称。
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// destObjectKey 目标Object名称。目标Bucket名称为Bucket.BucketName。
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// partSize 复制文件片的大小，字节数。比如100 * 1024为每片100KB。
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// options Object的属性限制项。详见InitiateMultipartUpload。
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//
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// error 操作成功error为nil，非nil为错误信息。
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//
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func (bucket Bucket) CopyFile(srcBucketName, srcObjectKey, destObjectKey string, partSize int64, options ...Option) error {
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destBucketName := bucket.BucketName
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if partSize < MinPartSize || partSize > MaxPartSize {
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return errors.New("oss: part size invalid range (1024KB, 5GB]")
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}
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cpConf, err := getCpConfig(options, filepath.Base(destObjectKey))
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if err != nil {
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return err
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}
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routines := getRoutines(options)
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if cpConf.IsEnable {
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return bucket.copyFileWithCp(srcBucketName, srcObjectKey, destBucketName, destObjectKey,
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partSize, options, cpConf.FilePath, routines)
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}
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return bucket.copyFile(srcBucketName, srcObjectKey, destBucketName, destObjectKey,
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partSize, options, routines)
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}
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// ----- 并发无断点的下载 -----
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// 工作协程参数
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type copyWorkerArg struct {
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bucket *Bucket
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imur InitiateMultipartUploadResult
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srcBucketName string
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srcObjectKey string
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options []Option
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hook copyPartHook
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}
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// Hook用于测试
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type copyPartHook func(part copyPart) error
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var copyPartHooker copyPartHook = defaultCopyPartHook
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func defaultCopyPartHook(part copyPart) error {
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return nil
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}
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// 工作协程
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func copyWorker(id int, arg copyWorkerArg, jobs <-chan copyPart, results chan<- UploadPart, failed chan<- error, die <-chan bool) {
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for chunk := range jobs {
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if err := arg.hook(chunk); err != nil {
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failed <- err
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break
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}
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chunkSize := chunk.End - chunk.Start + 1
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part, err := arg.bucket.UploadPartCopy(arg.imur, arg.srcBucketName, arg.srcObjectKey,
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chunk.Start, chunkSize, chunk.Number, arg.options...)
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if err != nil {
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failed <- err
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break
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}
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select {
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case <-die:
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return
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default:
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}
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results <- part
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}
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}
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// 调度协程
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func copyScheduler(jobs chan copyPart, parts []copyPart) {
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for _, part := range parts {
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jobs <- part
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}
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close(jobs)
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}
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// 分片
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type copyPart struct {
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Number int // 片序号[1, 10000]
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Start int64 // 片起始位置
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End int64 // 片结束位置
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}
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// 文件分片
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func getCopyParts(bucket *Bucket, objectKey string, partSize int64) ([]copyPart, error) {
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meta, err := bucket.GetObjectDetailedMeta(objectKey)
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if err != nil {
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return nil, err
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}
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parts := []copyPart{}
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objectSize, err := strconv.ParseInt(meta.Get(HTTPHeaderContentLength), 10, 0)
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if err != nil {
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return nil, err
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}
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part := copyPart{}
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i := 0
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for offset := int64(0); offset < objectSize; offset += partSize {
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part.Number = i + 1
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part.Start = offset
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part.End = GetPartEnd(offset, objectSize, partSize)
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parts = append(parts, part)
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i++
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}
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return parts, nil
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}
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// 获取源文件大小
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func getSrcObjectBytes(parts []copyPart) int64 {
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var ob int64
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for _, part := range parts {
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ob += (part.End - part.Start + 1)
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}
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return ob
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}
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// 并发无断点续传的下载
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func (bucket Bucket) copyFile(srcBucketName, srcObjectKey, destBucketName, destObjectKey string,
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partSize int64, options []Option, routines int) error {
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descBucket, err := bucket.Client.Bucket(destBucketName)
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srcBucket, err := bucket.Client.Bucket(srcBucketName)
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listener := getProgressListener(options)
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// 分割文件
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parts, err := getCopyParts(srcBucket, srcObjectKey, partSize)
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if err != nil {
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return err
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}
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// 初始化上传任务
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imur, err := descBucket.InitiateMultipartUpload(destObjectKey, options...)
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if err != nil {
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return err
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}
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jobs := make(chan copyPart, len(parts))
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results := make(chan UploadPart, len(parts))
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failed := make(chan error)
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die := make(chan bool)
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var completedBytes int64
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totalBytes := getSrcObjectBytes(parts)
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event := newProgressEvent(TransferStartedEvent, 0, totalBytes)
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publishProgress(listener, event)
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// 启动工作协程
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arg := copyWorkerArg{descBucket, imur, srcBucketName, srcObjectKey, options, copyPartHooker}
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for w := 1; w <= routines; w++ {
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go copyWorker(w, arg, jobs, results, failed, die)
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}
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// 并发上传分片
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go copyScheduler(jobs, parts)
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// 等待分片下载完成
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completed := 0
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ups := make([]UploadPart, len(parts))
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for completed < len(parts) {
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select {
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case part := <-results:
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completed++
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ups[part.PartNumber-1] = part
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completedBytes += (parts[part.PartNumber-1].End - parts[part.PartNumber-1].Start + 1)
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event = newProgressEvent(TransferDataEvent, completedBytes, totalBytes)
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publishProgress(listener, event)
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case err := <-failed:
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close(die)
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descBucket.AbortMultipartUpload(imur)
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event = newProgressEvent(TransferFailedEvent, completedBytes, totalBytes)
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publishProgress(listener, event)
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return err
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}
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if completed >= len(parts) {
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break
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}
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}
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event = newProgressEvent(TransferCompletedEvent, completedBytes, totalBytes)
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publishProgress(listener, event)
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// 提交任务
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_, err = descBucket.CompleteMultipartUpload(imur, ups)
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if err != nil {
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bucket.AbortMultipartUpload(imur)
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return err
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}
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return nil
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}
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// ----- 并发有断点的下载 -----
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const copyCpMagic = "84F1F18C-FF1D-403B-A1D8-9DEB5F65910A"
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type copyCheckpoint struct {
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Magic string // magic
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MD5 string // cp内容的MD5
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SrcBucketName string // 源Bucket
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SrcObjectKey string // 源Object
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DestBucketName string // 目标Bucket
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DestObjectKey string // 目标Bucket
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CopyID string // copy id
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ObjStat objectStat // 文件状态
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Parts []copyPart // 全部分片
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CopyParts []UploadPart // 分片上传成功后的返回值
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PartStat []bool // 分片下载是否完成
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}
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// CP数据是否有效，CP有效且Object没有更新时有效
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func (cp copyCheckpoint) isValid(bucket *Bucket, objectKey string) (bool, error) {
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// 比较CP的Magic及MD5
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cpb := cp
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cpb.MD5 = ""
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js, _ := json.Marshal(cpb)
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sum := md5.Sum(js)
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b64 := base64.StdEncoding.EncodeToString(sum[:])
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if cp.Magic != downloadCpMagic || b64 != cp.MD5 {
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return false, nil
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}
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// 确认object没有更新
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meta, err := bucket.GetObjectDetailedMeta(objectKey)
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if err != nil {
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return false, err
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}
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objectSize, err := strconv.ParseInt(meta.Get(HTTPHeaderContentLength), 10, 0)
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if err != nil {
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return false, err
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}
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// 比较Object的大小/最后修改时间/etag
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if cp.ObjStat.Size != objectSize ||
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cp.ObjStat.LastModified != meta.Get(HTTPHeaderLastModified) ||
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cp.ObjStat.Etag != meta.Get(HTTPHeaderEtag) {
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return false, nil
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}
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return true, nil
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}
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// 从文件中load
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func (cp *copyCheckpoint) load(filePath string) error {
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contents, err := ioutil.ReadFile(filePath)
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if err != nil {
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return err
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}
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err = json.Unmarshal(contents, cp)
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return err
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}
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// 更新分片状态
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func (cp *copyCheckpoint) update(part UploadPart) {
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cp.CopyParts[part.PartNumber-1] = part
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cp.PartStat[part.PartNumber-1] = true
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}
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// dump到文件
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func (cp *copyCheckpoint) dump(filePath string) error {
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bcp := *cp
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// 计算MD5
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bcp.MD5 = ""
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js, err := json.Marshal(bcp)
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if err != nil {
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return err
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}
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sum := md5.Sum(js)
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b64 := base64.StdEncoding.EncodeToString(sum[:])
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bcp.MD5 = b64
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// 序列化
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js, err = json.Marshal(bcp)
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if err != nil {
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return err
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}
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// dump
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return ioutil.WriteFile(filePath, js, FilePermMode)
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}
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// 未完成的分片
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func (cp copyCheckpoint) todoParts() []copyPart {
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dps := []copyPart{}
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for i, ps := range cp.PartStat {
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if !ps {
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dps = append(dps, cp.Parts[i])
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}
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}
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return dps
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}
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// 完成的字节数
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func (cp copyCheckpoint) getCompletedBytes() int64 {
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var completedBytes int64
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for i, part := range cp.Parts {
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if cp.PartStat[i] {
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completedBytes += (part.End - part.Start + 1)
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}
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}
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return completedBytes
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}
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// 初始化下载任务
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func (cp *copyCheckpoint) prepare(srcBucket *Bucket, srcObjectKey string, destBucket *Bucket, destObjectKey string,
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partSize int64, options []Option) error {
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// cp
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cp.Magic = copyCpMagic
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cp.SrcBucketName = srcBucket.BucketName
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cp.SrcObjectKey = srcObjectKey
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cp.DestBucketName = destBucket.BucketName
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cp.DestObjectKey = destObjectKey
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// object
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meta, err := srcBucket.GetObjectDetailedMeta(srcObjectKey)
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if err != nil {
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return err
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}
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objectSize, err := strconv.ParseInt(meta.Get(HTTPHeaderContentLength), 10, 0)
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if err != nil {
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return err
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}
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cp.ObjStat.Size = objectSize
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cp.ObjStat.LastModified = meta.Get(HTTPHeaderLastModified)
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cp.ObjStat.Etag = meta.Get(HTTPHeaderEtag)
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// parts
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cp.Parts, err = getCopyParts(srcBucket, srcObjectKey, partSize)
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if err != nil {
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return err
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}
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cp.PartStat = make([]bool, len(cp.Parts))
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for i := range cp.PartStat {
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cp.PartStat[i] = false
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}
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cp.CopyParts = make([]UploadPart, len(cp.Parts))
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// init copy
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imur, err := destBucket.InitiateMultipartUpload(destObjectKey, options...)
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if err != nil {
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return err
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}
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cp.CopyID = imur.UploadID
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return nil
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}
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func (cp *copyCheckpoint) complete(bucket *Bucket, parts []UploadPart, cpFilePath string) error {
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imur := InitiateMultipartUploadResult{Bucket: cp.DestBucketName,
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Key: cp.DestObjectKey, UploadID: cp.CopyID}
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_, err := bucket.CompleteMultipartUpload(imur, parts)
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if err != nil {
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return err
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}
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os.Remove(cpFilePath)
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return err
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}
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// 并发带断点的下载
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func (bucket Bucket) copyFileWithCp(srcBucketName, srcObjectKey, destBucketName, destObjectKey string,
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partSize int64, options []Option, cpFilePath string, routines int) error {
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descBucket, err := bucket.Client.Bucket(destBucketName)
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srcBucket, err := bucket.Client.Bucket(srcBucketName)
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listener := getProgressListener(options)
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// LOAD CP数据
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ccp := copyCheckpoint{}
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err = ccp.load(cpFilePath)
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if err != nil {
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os.Remove(cpFilePath)
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}
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// LOAD出错或数据无效重新初始化下载
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valid, err := ccp.isValid(srcBucket, srcObjectKey)
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if err != nil || !valid {
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if err = ccp.prepare(srcBucket, srcObjectKey, descBucket, destObjectKey, partSize, options); err != nil {
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return err
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}
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os.Remove(cpFilePath)
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}
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// 未完成的分片
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parts := ccp.todoParts()
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imur := InitiateMultipartUploadResult{
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Bucket: destBucketName,
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Key: destObjectKey,
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UploadID: ccp.CopyID}
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jobs := make(chan copyPart, len(parts))
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results := make(chan UploadPart, len(parts))
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failed := make(chan error)
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die := make(chan bool)
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completedBytes := ccp.getCompletedBytes()
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event := newProgressEvent(TransferStartedEvent, completedBytes, ccp.ObjStat.Size)
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publishProgress(listener, event)
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// 启动工作协程
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arg := copyWorkerArg{descBucket, imur, srcBucketName, srcObjectKey, options, copyPartHooker}
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for w := 1; w <= routines; w++ {
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go copyWorker(w, arg, jobs, results, failed, die)
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}
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// 并发下载分片
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go copyScheduler(jobs, parts)
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// 等待分片下载完成
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completed := 0
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for completed < len(parts) {
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select {
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case part := <-results:
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completed++
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ccp.update(part)
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ccp.dump(cpFilePath)
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completedBytes += (parts[part.PartNumber-1].End - parts[part.PartNumber-1].Start + 1)
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event = newProgressEvent(TransferDataEvent, completedBytes, ccp.ObjStat.Size)
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publishProgress(listener, event)
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case err := <-failed:
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close(die)
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event = newProgressEvent(TransferFailedEvent, completedBytes, ccp.ObjStat.Size)
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publishProgress(listener, event)
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return err
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}
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if completed >= len(parts) {
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break
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}
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}
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event = newProgressEvent(TransferCompletedEvent, completedBytes, ccp.ObjStat.Size)
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publishProgress(listener, event)
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return ccp.complete(descBucket, ccp.CopyParts, cpFilePath)
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}
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