79 lines
2.3 KiB
Go
79 lines
2.3 KiB
Go
package main
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// Copyright (c) 2016 Mattias Wadman
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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// of the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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import (
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"bytes"
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"io"
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)
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type restartBuffer struct {
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Buffer bytes.Buffer
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Restarted bool
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}
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func (rb *restartBuffer) Read(r io.Reader, p []byte) (n int, err error) {
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if rb.Restarted {
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if rb.Buffer.Len() > 0 {
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return rb.Buffer.Read(p)
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}
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n, err = r.Read(p)
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return n, err
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}
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n, err = r.Read(p)
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rb.Buffer.Write(p[:n])
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return n, err
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}
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// ReReader transparently buffers all reads from a reader until Restarted
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// is set to true. When restarted buffered data will be replayed on read and
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// after that normal reading from the reader continues.
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type ReReader struct {
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io.Reader
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restartBuffer
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}
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// NewReReader return a initialized ReReader
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func NewReReader(r io.Reader) *ReReader {
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return &ReReader{Reader: r}
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}
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func (rr *ReReader) Read(p []byte) (n int, err error) {
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return rr.restartBuffer.Read(rr.Reader, p)
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}
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// ReReadCloser is same as ReReader but also forwards Close calls
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type ReReadCloser struct {
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io.ReadCloser
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restartBuffer
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}
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// NewReReadCloser return a initialized ReReadCloser
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func NewReReadCloser(rc io.ReadCloser) *ReReadCloser {
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return &ReReadCloser{ReadCloser: rc}
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}
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func (rc *ReReadCloser) Read(p []byte) (n int, err error) {
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return rc.restartBuffer.Read(rc.ReadCloser, p)
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}
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