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storage_download.go
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storage_download.go
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package cmd
import (
"context"
"errors"
"fmt"
"os"
"path"
"strings"
"time"
"github.com/aws/aws-sdk-go-v2/aws"
s3manager "github.com/aws/aws-sdk-go-v2/feature/s3/manager"
"github.com/aws/aws-sdk-go-v2/service/s3"
s3types "github.com/aws/aws-sdk-go-v2/service/s3/types"
"github.com/spf13/cobra"
"github.com/vbauerster/mpb/v4"
"github.com/vbauerster/mpb/v4/decor"
)
type storageDownloadConfig struct {
bucket string
prefix string
source string
destination string
objects []*s3types.Object
recursive bool
overwrite bool
dryRun bool
}
var storageDownloadCmd = &cobra.Command{
Use: "download sos://BUCKET/[OBJECT|PREFIX/] [DESTINATION]",
Aliases: []string{"get"},
Short: "Download files from a bucket",
Long: `This command downloads files from a bucket.
If no destination argument is provided, files will be stored into the current
directory.
Examples:
# Download a single file
exo storage download sos://my-bucket/file-a
# Download a single file and rename it locally
exo storage download sos://my-bucket/file-a file-z
# Download a prefix recursively
exo storage download -r sos://my-bucket/public/ /tmp/public/
`,
PreRunE: func(cmd *cobra.Command, args []string) error {
if len(args) < 1 || len(args) > 2 {
cmdExitOnUsageError(cmd, "invalid arguments")
}
args[0] = strings.TrimPrefix(args[0], storageBucketPrefix)
// Append implicit root prefix ("/") if only a bucket name is specified in the source
if !strings.Contains(args[0], "/") {
args[0] = args[0] + "/"
}
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
var (
bucket string
prefix string
src = args[0]
dst = "./"
)
dryRun, err := cmd.Flags().GetBool("dry-run")
if err != nil {
return err
}
force, err := cmd.Flags().GetBool("force")
if err != nil {
return err
}
recursive, err := cmd.Flags().GetBool("recursive")
if err != nil {
return err
}
parts := strings.SplitN(src, "/", 2)
bucket = parts[0]
if len(parts) > 1 {
prefix = parts[1]
if prefix == "" {
prefix = "/"
}
}
if len(args) == 2 {
dst = args[1]
}
if strings.HasSuffix(src, "/") && !recursive {
return fmt.Errorf("%q is a directory, use flag `-r` to download recursively", src)
}
storage, err := newStorageClient(
storageClientOptZoneFromBucket(bucket),
)
if err != nil {
return fmt.Errorf("unable to initialize storage client: %v", err)
}
objects := make([]*s3types.Object, 0)
if err := storage.forEachObject(bucket, prefix, recursive, func(o *s3types.Object) error {
objects = append(objects, o)
return nil
}); err != nil {
return fmt.Errorf("error listing objects: %s", err)
}
return storage.downloadFiles(&storageDownloadConfig{
bucket: bucket,
prefix: prefix,
source: src,
objects: objects,
destination: dst,
recursive: recursive,
overwrite: force,
dryRun: dryRun,
})
},
}
func init() {
storageDownloadCmd.Flags().BoolP("force", "f", false,
"overwrite existing destination files")
storageDownloadCmd.Flags().BoolP("dry-run", "n", false,
"simulate files download, don't actually do it")
storageDownloadCmd.Flags().BoolP("recursive", "r", false,
"download prefix recursively")
storageCmd.AddCommand(storageDownloadCmd)
}
func (c *storageClient) downloadFiles(config *storageDownloadConfig) error {
if len(config.objects) > 1 && !strings.HasSuffix(config.destination, "/") {
return errors.New(`multiple files to download, destination must end with "/"`)
}
// Handle relative filesystem destination (e.g. ".", "../.." etc.)
if dstInfo, err := os.Stat(config.destination); err == nil {
if dstInfo.IsDir() && !strings.HasSuffix(config.destination, "/") {
config.destination += "/"
}
}
if config.dryRun {
fmt.Println("[DRY-RUN]")
}
for _, object := range config.objects {
dst := func() string {
if strings.HasSuffix(config.source, "/") {
return path.Join(config.destination, strings.TrimPrefix(aws.ToString(object.Key), config.prefix))
}
if strings.HasSuffix(config.destination, "/") {
return path.Join(config.destination, path.Base(aws.ToString(object.Key)))
}
return path.Join(config.destination)
}()
if config.dryRun {
fmt.Printf("%s/%s -> %s\n", config.bucket, aws.ToString(object.Key), dst)
continue
}
if _, err := os.Stat(dst); err == nil && !config.overwrite {
return fmt.Errorf("file %q already exists, use flag `-f` to overwrite", dst)
}
if _, err := os.Stat(path.Dir(dst)); errors.Is(err, os.ErrNotExist) {
if err := os.MkdirAll(path.Dir(dst), 0o755); err != nil {
return err
}
}
if err := c.downloadFile(config.bucket, object, dst); err != nil {
return err
}
}
return nil
}
func (c *storageClient) downloadFile(bucket string, object *s3types.Object, dst string) error {
maxFilenameLen := 16
pb := mpb.NewWithContext(gContext,
mpb.ContainerOptOn(mpb.WithOutput(nil), func() bool {
return gQuiet
}),
)
bar := pb.AddBar(
object.Size,
mpb.PrependDecorators(
decor.Name(ellipString(aws.ToString(object.Key), maxFilenameLen),
decor.WC{W: maxFilenameLen, C: decor.DidentRight}),
),
mpb.AppendDecorators(
decor.CountersKibiByte("% .2f / % .2f", decor.WCSyncWidthR),
decor.Name(" | "),
decor.Elapsed(decor.ET_STYLE_GO),
),
)
// Workaround required to avoid the io.Reader from hanging when uploading empty files
// (see https://github.com/vbauerster/mpb/issues/7#issuecomment-518756758)
if object.Size == 0 {
bar.SetTotal(100, true)
}
f, err := os.OpenFile(dst, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o644)
if err != nil {
return err
}
defer f.Close()
getObjectInput := s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: object.Key,
}
_, err = s3manager.
NewDownloader(c.Client).
Download(
gContext,
// mpb doesn't natively support the io.WriteAt interface expected
// by the s3manager.Download()'s w parameter, so we wrap in a shim
// to be able to track the download progress. Trick inspired from
// https://github.com/vbauerster/mpb/blob/v4/proxyreader.go
&proxyWriterAt{
wt: f,
bar: bar,
iT: time.Now(),
},
&getObjectInput,
)
pb.Wait()
if errors.Is(err, context.Canceled) {
fmt.Fprintf(os.Stderr, "\rDownload interrupted by user\n")
return nil
}
return err
}