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|
package queue
import (
"errors"
"time"
"io"
)
var errTimeout = errors.New("read timeout expired")
type Q chan []byte
type reader struct {
b []byte
q Q
d time.Duration
}
type writer struct {
q Q
}
func New() Q {
return make(Q)
}
func (q Q) Reader() io.Reader {
return &reader{q: q}
}
func (q Q) TimeoutReader(d time.Duration) io.Reader {
return &reader{q: q, d: d}
}
func (r *reader) Read(p []byte) (int, error) {
if len(r.b) == 0 {
if r.d == 0 {
r.b = <-r.q
} else {
t := time.NewTimer(r.d)
select {
case r.b = <-r.q:
t.Stop()
case <-t.C:
return 0, errTimeout
}
}
if r.b == nil {
return 0, io.EOF
}
}
n := copy(p, r.b)
r.b = r.b[n:]
return n, nil
}
func (r *reader) ReadByte() (byte, error) {
var b [1]byte
_, err := r.Read(b[:])
return b[0], err
}
func (r *reader) WriteTo(w io.Writer) (int64, error) {
if writer, ok := w.(*writer); ok {
if len(r.b) > 0 {
writer.q <- r.b
}
return 0, Copy(r.q, writer.q)
}
if len(r.b) > 0 {
if _, err := w.Write(r.b); err != nil {
return 0, err
}
}
for b := range r.q {
if _, err := w.Write(b); err != nil {
return 0, err
}
}
return 0, nil
}
func (q Q) Writer() io.Writer {
return &writer{q: q}
}
func (q Q) Dry() {
for _ = range q {
}
}
func (w *writer) Write(p []byte) (int, error) {
buf := make([]byte, len(p))
copy(buf, p)
w.q <- buf
return len(p), nil
}
func IoCopy(r io.Reader, w io.Writer) error {
if _, err := io.Copy(w, r); err != nil {
if err != io.EOF {
return err
}
}
return nil
}
func Copy(rq, wq Q) error {
for b := range rq {
wq <- b
}
return nil
}
|
