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util.go
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/
util.go
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package cryptapi
import (
"errors"
"io"
"io/ioutil"
"os"
"github.com/hashicorp/go-multierror"
)
type bufferedFile struct {
f *os.File
deleted bool
}
func (b *bufferedFile) Seek(offset int64, whence int) (int64, error) {
if b.deleted {
return 0, errors.New("buffered file already deleted")
}
return b.f.Seek(offset, whence)
}
func (b *bufferedFile) Read(p []byte) (n int, err error) {
if b.deleted {
return 0, errors.New("buffered file already deleted")
}
return b.f.Read(p)
}
func (b *bufferedFile) Close() error {
err := b.f.Close()
if !b.deleted {
b.deleted = true
err2 := os.Remove(b.f.Name())
if err2 != nil {
err = multierror.Append(err, err2)
}
}
return err
}
func BufferInFile(r io.Reader) (rc io.ReadSeekCloser, e error) {
f, err := ioutil.TempFile("", "file-buffer")
if err != nil {
return nil, err
}
b := &bufferedFile{f: f}
defer func() {
// if we fail, make sure to close the buffered file, which will also delete it from the filesystem.
if rc == nil {
e = multierror.Append(e, b.Close())
}
}()
if _, err = io.Copy(f, r); err != nil {
return nil, err
}
if _, err = f.Seek(0, io.SeekStart); err != nil {
return nil, err
}
return b, nil
}
type CombinedReadCloser struct {
io.Reader
io.Closer
}
var _ io.ReadCloser = CombinedReadCloser{}