/
zip.go
340 lines (283 loc) · 6.89 KB
/
zip.go
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package archiver
import (
"fmt"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
"runtime"
"strconv"
"sync"
"github.com/itchio/arkive/zip"
"github.com/itchio/headway/counter"
"github.com/itchio/headway/state"
"github.com/pkg/errors"
)
func ExtractZip(readerAt io.ReaderAt, size int64, dir string, settings ExtractSettings) (*ExtractResult, error) {
dirCount := 0
regCount := 0
symlinkCount := 0
reader, err := zip.NewReader(readerAt, size)
if err != nil {
return nil, errors.WithStack(err)
}
var totalSize int64
for _, file := range reader.File {
totalSize += int64(file.UncompressedSize64)
}
var doneSize uint64
var doneSizeMutex sync.Mutex
var lastDoneIndex int = -1
func() {
if settings.ResumeFrom == "" {
return
}
resBytes, resErr := ioutil.ReadFile(settings.ResumeFrom)
if resErr != nil {
if errors.Cause(resErr) != os.ErrNotExist {
settings.Consumer.Warnf("Couldn't read resume file: %s", resErr.Error())
}
return
}
lastDone64, resErr := strconv.ParseInt(string(resBytes), 10, 64)
if resErr != nil {
settings.Consumer.Warnf("Couldn't parse resume file: %s", resErr.Error())
return
}
lastDoneIndex = int(lastDone64)
settings.Consumer.Infof("Resuming from file %d", lastDoneIndex)
}()
warnedAboutWrite := false
writeProgress := func(fileIndex int) {
if settings.ResumeFrom == "" {
return
}
payload := fmt.Sprintf("%d", fileIndex)
wErr := ioutil.WriteFile(settings.ResumeFrom, []byte(payload), 0644)
if wErr != nil {
if !warnedAboutWrite {
warnedAboutWrite = true
settings.Consumer.Warnf("Couldn't save resume file: %s", wErr.Error())
}
return
}
}
defer func() {
if settings.ResumeFrom == "" {
return
}
rErr := os.Remove(settings.ResumeFrom)
if rErr != nil {
settings.Consumer.Warnf("Couldn't remove resume file: %s", rErr.Error())
}
}()
if settings.OnUncompressedSizeKnown != nil {
settings.OnUncompressedSizeKnown(totalSize)
}
windows := runtime.GOOS == "windows"
numWorkers := settings.Concurrency
if numWorkers < 0 {
numWorkers = runtime.NumCPU() - 1
}
if numWorkers < 1 {
numWorkers = 1
}
settings.Consumer.Infof("Using %d workers", numWorkers)
fileIndices := make(chan int)
errs := make(chan error, numWorkers)
updateProgress := func() {
doneSizeMutex.Lock()
settings.Consumer.Progress(float64(doneSize) / float64(totalSize))
doneSizeMutex.Unlock()
}
done := func(file *zip.File) {
if file.FileInfo().IsDir() {
return
}
if settings.OnEntryDone != nil {
settings.OnEntryDone(filepath.ToSlash(file.Name))
}
}
for i := 0; i < numWorkers; i++ {
go func() {
reader, err := zip.NewReader(readerAt, size)
if err != nil {
errs <- errors.WithStack(err)
return
}
for fileIndex := range fileIndices {
file := reader.File[fileIndex]
if fileIndex <= lastDoneIndex {
settings.Consumer.Debugf("Skipping file %d", fileIndex)
done(file)
doneSizeMutex.Lock()
doneSize += file.UncompressedSize64
doneSizeMutex.Unlock()
updateProgress()
continue
}
err = func() error {
rel := file.Name
filename := path.Join(dir, filepath.FromSlash(rel))
info := file.FileInfo()
mode := info.Mode()
if info.IsDir() {
if settings.DryRun {
// muffin
} else {
err = Mkdir(filename)
if err != nil {
return errors.WithStack(err)
}
}
dirCount++
} else if mode&os.ModeSymlink > 0 && !windows {
fileReader, fErr := file.Open()
if fErr != nil {
return errors.WithStack(fErr)
}
defer fileReader.Close()
linkname, lErr := ioutil.ReadAll(fileReader)
if settings.DryRun {
// muffin
} else {
lErr = Symlink(string(linkname), filename, settings.Consumer)
if lErr != nil {
return errors.WithStack(lErr)
}
}
symlinkCount++
} else {
regCount++
fileReader, fErr := file.Open()
if fErr != nil {
return errors.WithStack(fErr)
}
defer fileReader.Close()
settings.Consumer.Debugf("extract %s", filename)
var lastOffset int64
countingReader := counter.NewReaderCallback(func(offset int64) {
doneRecently := offset - lastOffset
lastOffset = offset
doneSizeMutex.Lock()
doneSize += uint64(doneRecently)
doneSizeMutex.Unlock()
updateProgress()
}, fileReader)
if settings.DryRun {
_, err = io.Copy(ioutil.Discard, countingReader)
if err != nil {
return errors.WithStack(err)
}
} else {
err = CopyFile(filename, os.FileMode(mode&LuckyMode|ModeMask), countingReader)
if err != nil {
return errors.WithStack(err)
}
}
}
return nil
}()
if err != nil {
errs <- errors.WithStack(err)
return
}
writeProgress(fileIndex)
done(file)
}
errs <- nil
}()
}
for fileIndex := range reader.File {
select {
case fileIndices <- fileIndex:
// sent work, yay!
case err := <-errs:
// abort everything
close(fileIndices)
return nil, err
}
}
close(fileIndices)
for i := 0; i < numWorkers; i++ {
err := <-errs
if err != nil {
return nil, err
}
}
return &ExtractResult{
Dirs: dirCount,
Files: regCount,
Symlinks: symlinkCount,
}, nil
}
func CompressZip(archiveWriter io.Writer, dir string, consumer *state.Consumer) (*CompressResult, error) {
var err error
var uncompressedSize int64
var compressedSize int64
archiveCounter := counter.NewWriter(archiveWriter)
zipWriter := zip.NewWriter(archiveCounter)
defer zipWriter.Close()
defer func() {
if zipWriter != nil {
if zErr := zipWriter.Close(); err == nil && zErr != nil {
err = errors.WithStack(zErr)
}
}
}()
err = filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
name, wErr := filepath.Rel(dir, path)
if wErr != nil {
return wErr
}
if name == "." {
// don't add '.' to zip
return nil
}
name = filepath.ToSlash(name)
fh, wErr := zip.FileInfoHeader(info)
if wErr != nil {
return wErr
}
fh.Name = name
writer, wErr := zipWriter.CreateHeader(fh)
if wErr != nil {
return wErr
}
if info.IsDir() {
// good!
} else if info.Mode()&os.ModeSymlink > 0 {
dest, wErr := os.Readlink(path)
if wErr != nil {
return wErr
}
_, wErr = writer.Write([]byte(dest))
if wErr != nil {
return wErr
}
} else if info.Mode().IsRegular() {
reader, wErr := os.Open(path)
if wErr != nil {
return wErr
}
defer reader.Close()
copiedBytes, wErr := io.Copy(writer, reader)
if wErr != nil {
return wErr
}
uncompressedSize += copiedBytes
}
return nil
})
err = zipWriter.Close()
if err != nil {
return nil, errors.WithStack(err)
}
zipWriter = nil
compressedSize = archiveCounter.Count()
return &CompressResult{
UncompressedSize: uncompressedSize,
CompressedSize: compressedSize,
}, err
}