mirror of https://github.com/nealey/vail.git
49 lines
827 B
Go
49 lines
827 B
Go
package main
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import (
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"io"
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)
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type Repeater struct {
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Joins chan io.Writer
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Parts chan io.Writer
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Sends chan []byte
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subscribers []io.Writer
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}
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func NewRepeater() *Repeater {
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return &Repeater{
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Joins: make(chan io.Writer, 5),
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Parts: make(chan io.Writer, 5),
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Sends: make(chan []byte, 5),
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subscribers: make([]io.Writer, 0, 20),
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}
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}
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func (r *Repeater) Run() {
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for {
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r.loop()
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}
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}
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func (r *Repeater) loop() {
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select {
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case w := <- r.Joins:
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// Add subscriber
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r.subscribers = append(r.subscribers, w)
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case w := <- r.Parts:
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// Remove subscriber
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for i, s := range r.subscribers {
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if s == w {
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nsubs := len(r.subscribers)
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r.subscribers[i] = r.subscribers[nsubs-1]
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r.subscribers = r.subscribers[:nsubs-1]
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}
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}
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case p := <- r.Sends:
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for _, s := range r.subscribers {
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s.Write(p)
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}
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}
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}
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