8cf2a389d8
- use []byte instead of unnecessary string conversions - make LogManager.Broadcast private - make LogManager.GetHistory public - add tests
91 lines
1.5 KiB
Go
91 lines
1.5 KiB
Go
package proxy
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import (
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"container/ring"
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"io"
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"os"
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"sync"
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)
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type LogMonitor struct {
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clients map[chan []byte]bool
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mu sync.RWMutex
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buffer *ring.Ring
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bufferMu sync.RWMutex
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// typically this can be os.Stdout
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stdout io.Writer
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}
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func NewLogMonitor() *LogMonitor {
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return NewLogMonitorWriter(os.Stdout)
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}
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func NewLogMonitorWriter(stdout io.Writer) *LogMonitor {
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return &LogMonitor{
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clients: make(map[chan []byte]bool),
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buffer: ring.New(10 * 1024), // keep 10KB of buffered logs
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stdout: stdout,
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}
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}
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func (w *LogMonitor) Write(p []byte) (n int, err error) {
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n, err = w.stdout.Write(p)
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if err != nil {
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return n, err
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}
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w.bufferMu.Lock()
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w.buffer.Value = p
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w.buffer = w.buffer.Next()
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w.bufferMu.Unlock()
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w.broadcast(p)
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return n, nil
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}
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func (w *LogMonitor) GetHistory() []byte {
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w.bufferMu.RLock()
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defer w.bufferMu.RUnlock()
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var history []byte
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w.buffer.Do(func(p interface{}) {
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if p != nil {
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if content, ok := p.([]byte); ok {
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history = append(history, content...)
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}
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}
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})
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return history
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}
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func (w *LogMonitor) Subscribe() chan []byte {
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w.mu.Lock()
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defer w.mu.Unlock()
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ch := make(chan []byte, 100)
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w.clients[ch] = true
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return ch
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}
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func (w *LogMonitor) Unsubscribe(ch chan []byte) {
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w.mu.Lock()
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defer w.mu.Unlock()
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delete(w.clients, ch)
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close(ch)
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}
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func (w *LogMonitor) broadcast(msg []byte) {
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w.mu.RLock()
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defer w.mu.RUnlock()
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for client := range w.clients {
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select {
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case client <- msg:
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default:
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// If client buffer is full, skip
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}
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}
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}
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