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get.go
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get.go
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package commands
import (
"compress/gzip"
"errors"
"fmt"
"io"
"os"
gopath "path"
"strings"
"github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/cheggaaa/pb"
cmds "github.com/ipfs/go-ipfs/commands"
core "github.com/ipfs/go-ipfs/core"
path "github.com/ipfs/go-ipfs/path"
tar "github.com/ipfs/go-ipfs/thirdparty/tar"
uarchive "github.com/ipfs/go-ipfs/unixfs/archive"
)
var ErrInvalidCompressionLevel = errors.New("Compression level must be between 1 and 9")
var GetCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Download IPFS objects.",
ShortDescription: `
Retrieves the object named by <ipfs-or-ipns-path> and stores the data to disk.
By default, the output will be stored at ./<ipfs-path>, but an alternate path
can be specified with '--output=<path>' or '-o=<path>'.
To output a TAR archive instead of unpacked files, use '--archive' or '-a'.
To compress the output with GZIP compression, use '--compress' or '-C'. You
may also specify the level of compression by specifying '-l=<1-9>'.
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("ipfs-path", true, false, "The path to the IPFS object(s) to be outputted.").EnableStdin(),
},
Options: []cmds.Option{
cmds.StringOption("output", "o", "The path where output should be stored."),
cmds.BoolOption("archive", "a", "Output a TAR archive."),
cmds.BoolOption("compress", "C", "Compress the output with GZIP compression."),
cmds.IntOption("compression-level", "l", "The level of compression (1-9)."),
},
PreRun: func(req cmds.Request) error {
_, err := getCompressOptions(req)
return err
},
Run: func(req cmds.Request, res cmds.Response) {
cmplvl, err := getCompressOptions(req)
if err != nil {
res.SetError(err, cmds.ErrClient)
return
}
node, err := req.InvocContext().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
p := path.Path(req.Arguments()[0])
ctx := req.Context()
dn, err := core.Resolve(ctx, node, p)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
archive, _, _ := req.Option("archive").Bool()
reader, err := uarchive.DagArchive(ctx, dn, p.String(), node.DAG, archive, cmplvl)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(reader)
},
PostRun: func(req cmds.Request, res cmds.Response) {
if res.Output() == nil {
return
}
outReader := res.Output().(io.Reader)
res.SetOutput(nil)
outPath, _, _ := req.Option("output").String()
if len(outPath) == 0 {
_, outPath = gopath.Split(req.Arguments()[0])
outPath = gopath.Clean(outPath)
}
cmplvl, err := getCompressOptions(req)
if err != nil {
res.SetError(err, cmds.ErrClient)
return
}
archive, _, _ := req.Option("archive").Bool()
gw := getWriter{
Out: os.Stdout,
Err: os.Stderr,
Archive: archive,
Compression: cmplvl,
}
if err := gw.Write(outReader, outPath); err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
},
}
type clearlineReader struct {
io.Reader
out io.Writer
}
func (r *clearlineReader) Read(p []byte) (n int, err error) {
n, err = r.Reader.Read(p)
if err == io.EOF {
// callback
fmt.Fprintf(r.out, "\033[2K\r") // clear progress bar line on EOF
}
return
}
func progressBarForReader(out io.Writer, r io.Reader, l int64) (*pb.ProgressBar, io.Reader) {
// setup bar reader
// TODO: get total length of files
bar := pb.New64(l).SetUnits(pb.U_BYTES)
bar.Output = out
// the progress bar lib doesn't give us a way to get the width of the output,
// so as a hack we just use a callback to measure the output, then git rid of it
bar.Callback = func(line string) {
terminalWidth := len(line)
bar.Callback = nil
log.Infof("terminal width: %v\n", terminalWidth)
}
barR := bar.NewProxyReader(r)
return bar, &clearlineReader{barR, out}
}
type getWriter struct {
Out io.Writer // for output to user
Err io.Writer // for progress bar output
Archive bool
Compression int
}
func (gw *getWriter) Write(r io.Reader, fpath string) error {
if gw.Archive || gw.Compression != gzip.NoCompression {
return gw.writeArchive(r, fpath)
}
return gw.writeExtracted(r, fpath)
}
func (gw *getWriter) writeArchive(r io.Reader, fpath string) error {
// adjust file name if tar
if gw.Archive {
if !strings.HasSuffix(fpath, ".tar") && !strings.HasSuffix(fpath, ".tar.gz") {
fpath += ".tar"
}
}
// adjust file name if gz
if gw.Compression != gzip.NoCompression {
if !strings.HasSuffix(fpath, ".gz") {
fpath += ".gz"
}
}
// create file
file, err := os.Create(fpath)
if err != nil {
return err
}
defer file.Close()
fmt.Fprintf(gw.Out, "Saving archive to %s\n", fpath)
bar, barR := progressBarForReader(gw.Err, r, 0)
bar.Start()
defer bar.Finish()
_, err = io.Copy(file, barR)
return err
}
func (gw *getWriter) writeExtracted(r io.Reader, fpath string) error {
fmt.Fprintf(gw.Out, "Saving file(s) to %s\n", fpath)
bar, barR := progressBarForReader(gw.Err, r, 0)
bar.Start()
defer bar.Finish()
extractor := &tar.Extractor{fpath}
return extractor.Extract(barR)
}
func getCompressOptions(req cmds.Request) (int, error) {
cmprs, _, _ := req.Option("compress").Bool()
cmplvl, cmplvlFound, _ := req.Option("compression-level").Int()
switch {
case !cmprs:
return gzip.NoCompression, nil
case cmprs && !cmplvlFound:
return gzip.DefaultCompression, nil
case cmprs && cmplvlFound && (cmplvl < 1 || cmplvl > 9):
return gzip.NoCompression, ErrInvalidCompressionLevel
}
return cmplvl, nil
}