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writer.go
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writer.go
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package buf
import (
"io"
"sync"
)
// BufferToBytesWriter is a Writer that writes alloc.Buffer into underlying writer.
type BufferToBytesWriter struct {
writer io.Writer
}
// Write implements Writer.Write(). Write() takes ownership of the given buffer.
func (v *BufferToBytesWriter) Write(buffer *Buffer) error {
defer buffer.Release()
for {
nBytes, err := v.writer.Write(buffer.Bytes())
if err != nil {
return err
}
if nBytes == buffer.Len() {
break
}
buffer.SliceFrom(nBytes)
}
return nil
}
// Release implements Releasable.Release().
func (v *BufferToBytesWriter) Release() {
v.writer = nil
}
type BytesToBufferWriter struct {
sync.Mutex
writer Writer
}
func (v *BytesToBufferWriter) Write(payload []byte) (int, error) {
v.Lock()
defer v.Unlock()
if v.writer == nil {
return 0, io.ErrClosedPipe
}
bytesWritten := 0
size := len(payload)
for size > 0 {
buffer := New()
nBytes, _ := buffer.Write(payload)
size -= nBytes
payload = payload[nBytes:]
bytesWritten += nBytes
err := v.writer.Write(buffer)
if err != nil {
return bytesWritten, err
}
}
return bytesWritten, nil
}
func (v *BytesToBufferWriter) Release() {
v.Lock()
v.writer.Release()
v.writer = nil
v.Unlock()
}