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fix: incidental packet drop and weird UDP state maintaining (#539)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| package control | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
| ) | ||
|
|
||
| const UdpTaskQueueLength = 128 | ||
|
|
||
| type UdpTask = func() | ||
|
|
||
| type UdpTaskQueue struct { | ||
| ch chan UdpTask | ||
| timer *time.Timer | ||
| agingTime time.Duration | ||
| closed chan struct{} | ||
| freed chan struct{} | ||
| } | ||
|
|
||
| func (q *UdpTaskQueue) Push(task UdpTask) { | ||
| q.timer.Reset(q.agingTime) | ||
| q.ch <- task | ||
| } | ||
|
|
||
| type UdpTaskPool struct { | ||
| queueChPool sync.Pool | ||
| // mu protects m | ||
| mu sync.Mutex | ||
| m map[string]*UdpTaskQueue | ||
| } | ||
|
|
||
| func NewUdpTaskPool() *UdpTaskPool { | ||
| p := &UdpTaskPool{ | ||
| queueChPool: sync.Pool{New: func() any { | ||
| return make(chan UdpTask, UdpTaskQueueLength) | ||
| }}, | ||
| mu: sync.Mutex{}, | ||
| m: map[string]*UdpTaskQueue{}, | ||
| } | ||
| return p | ||
| } | ||
|
|
||
| func (p *UdpTaskPool) convoy(q *UdpTaskQueue) { | ||
| for { | ||
| select { | ||
| case <-q.closed: | ||
| clearloop: | ||
| for { | ||
| select { | ||
| case <-q.ch: | ||
| default: | ||
| break clearloop | ||
| } | ||
| } | ||
| close(q.freed) | ||
| return | ||
| case t := <-q.ch: | ||
| t() | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (p *UdpTaskPool) EmitTask(key string, task UdpTask) { | ||
| p.mu.Lock() | ||
| q, ok := p.m[key] | ||
| if !ok { | ||
| ch := p.queueChPool.Get().(chan UdpTask) | ||
| q = &UdpTaskQueue{ | ||
| ch: ch, | ||
| timer: nil, | ||
| agingTime: DefaultNatTimeout, | ||
| closed: make(chan struct{}), | ||
| freed: make(chan struct{}), | ||
| } | ||
| q.timer = time.AfterFunc(q.agingTime, func() { | ||
| p.mu.Lock() | ||
| defer p.mu.Unlock() | ||
| if p.m[key] == q { | ||
| delete(p.m, key) | ||
| } | ||
| close(q.closed) | ||
| <-q.freed | ||
| p.queueChPool.Put(ch) | ||
| }) | ||
| p.m[key] = q | ||
| go p.convoy(q) | ||
| } | ||
| p.mu.Unlock() | ||
| q.Push(task) | ||
| } | ||
|
|
||
| var DefaultUdpTaskPool = NewUdpTaskPool() |
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