예제 #1
0
func doPass(sc, dc *client.Client, passNum int) (stats SyncStats, retErr error) {
	srcBlobs := make(chan blobref.SizedBlobRef, 100)
	destBlobs := make(chan blobref.SizedBlobRef, 100)
	srcErr := make(chan error)
	destErr := make(chan error)

	go func() {
		srcErr <- sc.EnumerateBlobs(srcBlobs)
	}()
	checkSourceError := func() {
		if err := <-srcErr; err != nil {
			retErr = errors.New(fmt.Sprintf("Enumerate error from source: %v", err))
		}
	}

	if *flagDest == "stdout" {
		for sb := range srcBlobs {
			fmt.Printf("%s %d\n", sb.BlobRef, sb.Size)
		}
		checkSourceError()
		return
	}

	go func() {
		destErr <- dc.EnumerateBlobs(destBlobs)
	}()
	checkDestError := func() {
		if err := <-destErr; err != nil {
			retErr = errors.New(fmt.Sprintf("Enumerate error from destination: %v", err))
		}
	}

	destNotHaveBlobs := make(chan blobref.SizedBlobRef, 100)
	go client.ListMissingDestinationBlobs(destNotHaveBlobs, srcBlobs, destBlobs)
	for sb := range destNotHaveBlobs {
		fmt.Printf("Destination needs blob: %s\n", sb)

		blobReader, size, err := sc.FetchStreaming(sb.BlobRef)
		if err != nil {
			stats.ErrorCount++
			log.Printf("Error fetching %s: %v", sb.BlobRef, err)
			continue
		}
		if size != sb.Size {
			stats.ErrorCount++
			log.Printf("Source blobserver's enumerate size of %d for blob %s doesn't match its Get size of %d",
				sb.Size, sb.BlobRef, size)
			continue
		}
		uh := &client.UploadHandle{BlobRef: sb.BlobRef, Size: size, Contents: blobReader}
		pr, err := dc.Upload(uh)
		if err != nil {
			stats.ErrorCount++
			log.Printf("Upload of %s to destination blobserver failed: %v", sb.BlobRef, err)
			continue
		}
		if !pr.Skipped {
			stats.BlobsCopied++
			stats.BytesCopied += pr.Size
		}
		if *flagRemoveSource {
			if err = sc.RemoveBlob(sb.BlobRef); err != nil {
				stats.ErrorCount++
				log.Printf("Failed to delete %s from source: %v", sb.BlobRef, err)
			}
		}
	}

	checkSourceError()
	checkDestError()
	if retErr == nil && stats.ErrorCount > 0 {
		retErr = errors.New(fmt.Sprintf("%d errors during sync", stats.ErrorCount))
	}
	return stats, retErr
}