/
capture.go
88 lines (71 loc) · 1.11 KB
/
capture.go
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package sweet
import (
"bytes"
"os"
)
type pipeCapture struct {
r *os.File
w *os.File
buf bytes.Buffer
runChan chan struct{}
stopChan chan struct{}
}
func newPipeCapture() (*pipeCapture, error) {
r, w, err := os.Pipe()
if err != nil {
return nil, err
}
pc := &pipeCapture{
r: r,
w: w,
runChan: make(chan struct{}),
stopChan: make(chan struct{}),
}
go pc.readPipe()
<-pc.runChan
return pc, nil
}
func (pc *pipeCapture) readPipe() {
close(pc.runChan)
buf := make([]byte, 2048)
readLoop:
for {
select {
case <-pc.stopChan:
break readLoop
default:
}
rN, err := pc.r.Read(buf)
if err != nil {
return
}
writeStart := 0
for {
wN, err := pc.buf.Write(buf[writeStart : rN-writeStart])
if err != nil {
return
}
writeStart += wN
if writeStart == rN {
break
}
}
}
}
func (pc *pipeCapture) W() *os.File {
return pc.w
}
func (pc *pipeCapture) Buffer() []byte {
return pc.buf.Bytes()
}
func (pc *pipeCapture) Close() error {
err := pc.w.Close()
if err != nil {
return err
}
err = pc.r.Close()
if err != nil {
return err
}
return nil
}