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package writer
import (
"bytes"
"io"
"sync"
)
type WriterInterface interface {
io.Writer
Truncate()
DumpOut()
DumpOutWithHeader(header string)
}
type Writer struct {
buffer *bytes.Buffer
outWriter io.Writer
lock *sync.Mutex
stream bool
}
func New(outWriter io.Writer) *Writer {
return &Writer{
buffer: &bytes.Buffer{},
lock: &sync.Mutex{},
outWriter: outWriter,
stream: true,
}
}
func (w *Writer) SetStream(stream bool) {
w.lock.Lock()
defer w.lock.Unlock()
w.stream = stream
}
func (w *Writer) Write(b []byte) (n int, err error) {
w.lock.Lock()
defer w.lock.Unlock()
if w.stream {
return w.outWriter.Write(b)
} else {
return w.buffer.Write(b)
}
}
func (w *Writer) Truncate() {
w.lock.Lock()
defer w.lock.Unlock()
w.buffer.Reset()
}
func (w *Writer) DumpOut() {
w.lock.Lock()
defer w.lock.Unlock()
if !w.stream {
w.buffer.WriteTo(w.outWriter)
}
}
func (w *Writer) DumpOutWithHeader(header string) {
w.lock.Lock()
defer w.lock.Unlock()
if !w.stream && w.buffer.Len() > 0 {
w.outWriter.Write([]byte(header))
w.buffer.WriteTo(w.outWriter)
}
}
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