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|
package iohelper
import (
"io"
"sync"
"github.com/pkg/errors"
)
type NopWriteCloser struct {
io.Writer
}
func (w *NopWriteCloser) Close() error {
return nil
}
type closeFunc func() error
func (c closeFunc) Close() error {
return c()
}
// WithCloser returns a ReadCloser with additional closer function.
func WithCloser(r io.ReadCloser, closer func() error) io.ReadCloser {
var f closeFunc = func() error {
err1 := r.Close()
err2 := closer()
if err1 != nil {
return errors.Wrapf(err1, "failed to close: %v", err2)
}
return err2
}
return &readCloser{
Reader: r,
Closer: f,
}
}
type WriteCloser struct {
io.WriteCloser
CloseFunc func() error
}
func (wc *WriteCloser) Close() error {
err1 := wc.WriteCloser.Close()
err2 := wc.CloseFunc()
if err1 != nil {
return errors.Wrapf(err1, "failed to close: %v", err2)
}
return err2
}
type Counter struct {
n int64
mu sync.Mutex
}
func (c *Counter) Write(p []byte) (n int, err error) {
c.mu.Lock()
c.n += int64(len(p))
c.mu.Unlock()
return len(p), nil
}
func (c *Counter) Size() (n int64) {
c.mu.Lock()
n = c.n
c.mu.Unlock()
return
}
type ReaderAtCloser interface {
io.ReaderAt
io.Closer
Size() int64
}
// ReadCloser returns a ReadCloser from ReaderAtCloser.
func ReadCloser(in ReaderAtCloser) io.ReadCloser {
return &readCloser{
Reader: io.NewSectionReader(in, 0, in.Size()),
Closer: in,
}
}
type readCloser struct {
io.Reader
io.Closer
}
|
