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package fastzip
import (
"archive/zip"
"context"
"fmt"
"io"
"io/ioutil"
"os"
"github.com/saracen/fastzip"
"gitlab.com/gitlab-org/gitlab-runner/commands/helpers/archive"
)
var flateLevels = map[archive.CompressionLevel]int{
archive.FastestCompression: 0,
archive.FastCompression: 1,
archive.DefaultCompression: 5,
archive.SlowCompression: 7,
archive.SlowestCompression: 9,
}
// archiver is a zip stream archiver.
type archiver struct {
w io.Writer
dir string
level archive.CompressionLevel
}
// NewArchiver returns a new Zip Archiver.
func NewArchiver(w io.Writer, dir string, level archive.CompressionLevel) (archive.Archiver, error) {
return &archiver{
w: w,
dir: dir,
level: level,
}, nil
}
// Archive archives all files provided.
func (a *archiver) Archive(ctx context.Context, files map[string]os.FileInfo) error {
tmpDir, err := ioutil.TempDir("", "fastzip")
if err != nil {
return fmt.Errorf("fastzip archiver unable to create temporary directory: %w", err)
}
defer os.RemoveAll(tmpDir)
opts := []fastzip.ArchiverOption{
fastzip.WithStageDirectory(tmpDir),
}
if a.level == archive.FastestCompression {
opts = append(opts, fastzip.WithArchiverMethod(zip.Store))
}
fa, err := fastzip.NewArchiver(a.w, a.dir, opts...)
if err != nil {
return err
}
if a.level != archive.FastestCompression {
fa.RegisterCompressor(zip.Deflate, fastzip.FlateCompressor(flateLevels[a.level]))
}
err = fa.Archive(ctx, files)
if cerr := fa.Close(); err == nil && cerr != nil {
return cerr
}
return err
}
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