/
wrapreader.go
51 lines (44 loc) · 1.08 KB
/
wrapreader.go
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package client
import (
"io"
"github.com/hashicorp/go-multierror"
)
type wrapReader struct {
reader Reader
closer io.Closer
}
// WrapReader wraps reader and closer together to create a new io.ReadCloser.
//
// The Read function will simply call the wrapped reader's Read function,
// while the Close function will call the wrapped closer's Close function.
//
// If the wrapped reader is also an io.Closer,
// its Close function will be called in Close as well.
//
// closer can be `nil`, to support stdin.
func WrapReader(reader Reader, closer io.Closer) ReadCloser {
return &wrapReader{
reader: reader,
closer: closer,
}
}
func (r *wrapReader) Read(p []byte) (int, error) {
return r.reader.Read(p)
}
func (r *wrapReader) ReadByte() (byte, error) {
return r.reader.ReadByte()
}
func (r *wrapReader) Close() error {
var err error
if closer, ok := r.reader.(io.Closer); ok {
if merr := closer.Close(); merr != nil {
err = multierror.Append(err, merr)
}
}
if r.closer != nil {
if merr := r.closer.Close(); merr != nil {
err = multierror.Append(err, merr)
}
}
return err
}