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package tarlog
import (
"archive/tar"
"io"
"os"
"sync"
"github.com/pkg/errors"
)
type tarLogger struct {
writer *os.File
wg sync.WaitGroup
}
// NewLogger returns a writer that, when a tar archive is written to it, calls
// `logger` for each file header it encounters in the archive.
func NewLogger(logger func(*tar.Header)) (io.WriteCloser, error) {
reader, writer, err := os.Pipe()
if err != nil {
return nil, errors.Wrapf(err, "error creating pipe for tar logger")
}
t := &tarLogger{writer: writer}
tr := tar.NewReader(reader)
t.wg.Add(1)
go func() {
hdr, err := tr.Next()
for err == nil {
logger(hdr)
hdr, err = tr.Next()
}
reader.Close()
t.wg.Done()
}()
return t, nil
}
func (t *tarLogger) Write(b []byte) (int, error) {
return t.writer.Write(b)
}
func (t *tarLogger) Close() error {
err := t.writer.Close()
t.wg.Wait()
return err
}
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