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144 lines
2.4 KiB
Go
144 lines
2.4 KiB
Go
package com
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import (
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"io"
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"sync"
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"time"
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)
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func NewInMemory() *InMemory {
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return &InMemory{
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readBuffer: []byte{},
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writeBuffer: []byte{},
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readLock: new(sync.RWMutex),
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writeLock: new(sync.RWMutex),
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writeSignal: make(chan bool),
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closed: make(chan struct{}),
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}
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}
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type InMemory struct {
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readBuffer []byte
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writeBuffer []byte
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readLock *sync.RWMutex
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writeLock *sync.RWMutex
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writeSignal chan bool
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closed chan struct{}
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closeWhenEmpty bool
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}
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func (rw *InMemory) Close() error {
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select {
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case <-rw.closed:
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default:
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close(rw.closed)
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}
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return nil
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}
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func (rw *InMemory) WaitUntilClosed() {
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<-rw.closed
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}
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func (rw *InMemory) Read(p []byte) (int, error) {
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for {
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rw.readLock.RLock()
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if len(rw.readBuffer) > 0 {
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rw.readLock.RUnlock()
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break
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}
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rw.readLock.RUnlock()
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select {
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case <-rw.closed:
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return 0, io.EOF
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case <-time.After(10 * time.Millisecond):
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continue
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}
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}
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select {
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case <-rw.closed:
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return 0, io.EOF
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default:
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}
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rw.readLock.Lock()
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defer rw.readLock.Unlock()
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n := len(p)
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if n > len(rw.readBuffer) {
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n = len(rw.readBuffer)
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}
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copy(p, rw.readBuffer[0:n])
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if n < len(rw.readBuffer) {
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rw.readBuffer = rw.readBuffer[n:]
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} else {
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rw.readBuffer = []byte{}
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}
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if rw.closeWhenEmpty && len(rw.readBuffer) == 0 {
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close(rw.closed)
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}
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return n, nil
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}
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func (rw *InMemory) PrepareRead(p []byte) {
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rw.readLock.Lock()
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defer rw.readLock.Unlock()
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rw.readBuffer = append(rw.readBuffer, p...)
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}
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func (rw *InMemory) ClearRead() {
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rw.readLock.Lock()
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defer rw.readLock.Unlock()
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rw.readBuffer = []byte{}
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if rw.closeWhenEmpty && len(rw.readBuffer) == 0 {
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close(rw.closed)
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}
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}
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func (rw *InMemory) IsReadEmpty() bool {
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rw.readLock.RLock()
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defer rw.readLock.RUnlock()
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return len(rw.readBuffer) == 0
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}
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func (rw *InMemory) CloseWhenEmpty(value bool) {
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rw.readLock.Lock()
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defer rw.readLock.Unlock()
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rw.closeWhenEmpty = value
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}
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func (rw *InMemory) Write(p []byte) (int, error) {
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rw.writeLock.Lock()
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defer rw.writeLock.Unlock()
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rw.writeBuffer = append(rw.writeBuffer, p...)
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select {
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case rw.writeSignal <- true:
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default:
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}
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return len(p), nil
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}
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func (rw *InMemory) Written() []byte {
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rw.writeLock.RLock()
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defer rw.writeLock.RUnlock()
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return rw.writeBuffer
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}
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func (rw *InMemory) ClearWrite() {
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rw.writeLock.Lock()
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defer rw.writeLock.Unlock()
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rw.writeBuffer = []byte{}
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}
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func (rw *InMemory) WaitUntilWritten() {
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<-rw.writeSignal
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}
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