mirror of
https://github.com/nabbar/golib.git
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dbeb385267
- optimize code - remplace some pointer by atomic to prevent RACE Other: - bump dependencies
82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
/*
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* MIT License
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*
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* Copyright (c) 2024 Nicolas JUHEL
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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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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*
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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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*
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*
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*/
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package randRead
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import (
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"bufio"
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"bytes"
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"fmt"
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"sync/atomic"
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)
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type prnd struct {
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b *atomic.Value // *bufio.Reader
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r *remote
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}
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func (o *prnd) buf() (*bufio.Reader, error) {
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if i := o.b.Load(); i != nil {
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if b, k := i.(*bufio.Reader); k {
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return b, nil
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}
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}
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if o.r == nil {
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return nil, fmt.Errorf("invalid reader")
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}
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b := bufio.NewReader(o.r)
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o.b.Store(b)
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return b, nil
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}
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func (o *prnd) reset() {
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l := o.b.Swap(bufio.NewReader(bytes.NewReader(make([]byte, 0))))
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if b, k := l.(*bufio.Reader); k {
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b.Reset(bytes.NewReader(make([]byte, 0)))
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}
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}
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func (o *prnd) Read(p []byte) (n int, err error) {
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if b, e := o.buf(); e != nil {
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return 0, e
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} else {
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return b.Read(p)
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}
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}
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func (o *prnd) Close() error {
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o.reset()
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if o.r == nil {
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return fmt.Errorf("invalid reader")
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}
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return o.r.Close()
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}
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