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|
package main
import (
"fmt"
"io"
"log"
"strings"
)
type readAutoCloser struct {
r io.ReadCloser
}
func (a readAutoCloser) Read(b []byte) (n int, err error) {
if a.r == nil {
return 0, io.EOF
}
n, err = a.r.Read(b)
if err == io.EOF {
a.Close()
}
return n, err
}
func (a readAutoCloser) Close() error {
if a.r == nil {
return nil
}
return a.r.(io.Closer).Close()
}
type pipe struct {
Reader readAutoCloser
}
func newReadAutoCloser(r io.Reader) readAutoCloser {
if _, ok := r.(io.Closer); !ok {
return readAutoCloser{io.NopCloser(r)}
}
return readAutoCloser{r.(io.ReadCloser)}
}
func main() {
p := &pipe{}
p.Reader = newReadAutoCloser(strings.NewReader("test"))
b, err := io.ReadAll(p.Reader)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(b))
}
// Output:
// test
|
