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98 lines
2.4 KiB
98 lines
2.4 KiB
package s3_backend
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import (
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"fmt"
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"os"
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"sync/atomic"
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"github.com/aws/aws-sdk-go/aws"
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"github.com/aws/aws-sdk-go/service/s3"
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"github.com/aws/aws-sdk-go/service/s3/s3iface"
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"github.com/aws/aws-sdk-go/service/s3/s3manager"
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"github.com/chrislusf/seaweedfs/weed/glog"
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)
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func downloadFromS3(sess s3iface.S3API, destFileName string, sourceBucket string, sourceKey string,
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fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {
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fileSize, err = getFileSize(sess, sourceBucket, sourceKey)
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if err != nil {
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return
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}
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//open the file
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f, err := os.OpenFile(destFileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
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if err != nil {
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return 0, fmt.Errorf("failed to open file %q, %v", destFileName, err)
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}
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defer f.Close()
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// Create a downloader with the session and custom options
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downloader := s3manager.NewDownloaderWithClient(sess, func(u *s3manager.Downloader) {
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u.PartSize = int64(64 * 1024 * 1024)
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u.Concurrency = 5
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})
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fileWriter := &s3DownloadProgressedWriter{
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fp: f,
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size: fileSize,
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written: 0,
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fn: fn,
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}
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// Download the file from S3.
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fileSize, err = downloader.Download(fileWriter, &s3.GetObjectInput{
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Bucket: aws.String(sourceBucket),
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Key: aws.String(sourceKey),
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})
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if err != nil {
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return fileSize, fmt.Errorf("failed to download /buckets/%s%s to %s: %v", sourceBucket, sourceKey, destFileName, err)
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}
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glog.V(1).Infof("downloaded file %s\n", destFileName)
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return
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}
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// adapted from https://github.com/aws/aws-sdk-go/pull/1868
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// and https://petersouter.xyz/s3-download-progress-bar-in-golang/
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type s3DownloadProgressedWriter struct {
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fp *os.File
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size int64
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written int64
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fn func(progressed int64, percentage float32) error
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}
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func (w *s3DownloadProgressedWriter) WriteAt(p []byte, off int64) (int, error) {
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n, err := w.fp.WriteAt(p, off)
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if err != nil {
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return n, err
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}
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// Got the length have read( or means has uploaded), and you can construct your message
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atomic.AddInt64(&w.written, int64(n))
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if w.fn != nil {
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written := w.written
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if err := w.fn(written, float32(written*100)/float32(w.size)); err != nil {
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return n, err
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}
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}
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return n, err
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}
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func getFileSize(svc s3iface.S3API, bucket string, key string) (filesize int64, error error) {
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params := &s3.HeadObjectInput{
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Bucket: aws.String(bucket),
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Key: aws.String(key),
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}
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resp, err := svc.HeadObject(params)
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if err != nil {
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return 0, err
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}
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return *resp.ContentLength, nil
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}
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