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| package agent
|
| import (
| "io"
| "sync"
| )
|
| // GatedWriter is an io.Writer implementation that buffers all of its
| // data into an internal buffer until it is told to let data through.
| type GatedWriter struct {
| Writer io.Writer
|
| buf [][]byte
| flush bool
| lock sync.RWMutex
| }
|
| var _ io.Writer = &GatedWriter{}
|
| // Flush tells the GatedWriter to flush any buffered data and to stop
| // buffering.
| func (w *GatedWriter) Flush() {
| w.lock.Lock()
| w.flush = true
| w.lock.Unlock()
|
| for _, p := range w.buf {
| w.Write(p)
| }
| w.buf = nil
| }
|
| func (w *GatedWriter) Write(p []byte) (n int, err error) {
| w.lock.RLock()
| defer w.lock.RUnlock()
|
| if w.flush {
| return w.Writer.Write(p)
| }
|
| p2 := make([]byte, len(p))
| copy(p2, p)
| w.buf = append(w.buf, p2)
| return len(p), nil
| }
|
|
