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52 lines
1014 B
52 lines
1014 B
package buffered_writer
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import (
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"bytes"
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"io"
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)
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var _ = io.WriteCloser(&BufferedWriteCloser{})
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type BufferedWriteCloser struct {
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buffer bytes.Buffer
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bufferLimit int
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position int64
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nextFlushOffset int64
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FlushFunc func([]byte, int64) error
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CloseFunc func() error
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}
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func NewBufferedWriteCloser(bufferLimit int) *BufferedWriteCloser {
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return &BufferedWriteCloser{
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bufferLimit: bufferLimit,
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}
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}
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func (b *BufferedWriteCloser) Write(p []byte) (n int, err error) {
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if b.buffer.Len()+len(p) >= b.bufferLimit {
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if err := b.FlushFunc(b.buffer.Bytes(), b.nextFlushOffset); err != nil {
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return 0, err
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}
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b.nextFlushOffset += int64(b.buffer.Len())
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b.buffer.Reset()
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}
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return b.buffer.Write(p)
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}
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func (b *BufferedWriteCloser) Close() error {
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if b.buffer.Len() > 0 {
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if err := b.FlushFunc(b.buffer.Bytes(), b.nextFlushOffset); err != nil {
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return err
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}
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}
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if b.CloseFunc != nil {
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if err := b.CloseFunc(); err != nil {
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return err
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}
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}
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return nil
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}
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