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[client] Add peer conn init limit (netbirdio#3001)
Limit the peer connection initialization to 200 peers at the same time
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package semaphoregroup | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| ) | ||
|
|
||
| // SemaphoreGroup is a custom type that combines sync.WaitGroup and a semaphore. | ||
| type SemaphoreGroup struct { | ||
| waitGroup sync.WaitGroup | ||
| semaphore chan struct{} | ||
| } | ||
|
|
||
| // NewSemaphoreGroup creates a new SemaphoreGroup with the specified semaphore limit. | ||
| func NewSemaphoreGroup(limit int) *SemaphoreGroup { | ||
| return &SemaphoreGroup{ | ||
| semaphore: make(chan struct{}, limit), | ||
| } | ||
| } | ||
|
|
||
| // Add increments the internal WaitGroup counter and acquires a semaphore slot. | ||
| func (sg *SemaphoreGroup) Add(ctx context.Context) { | ||
| sg.waitGroup.Add(1) | ||
|
|
||
| // Acquire semaphore slot | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case sg.semaphore <- struct{}{}: | ||
| } | ||
| } | ||
|
|
||
| // Done decrements the internal WaitGroup counter and releases a semaphore slot. | ||
| func (sg *SemaphoreGroup) Done(ctx context.Context) { | ||
| sg.waitGroup.Done() | ||
|
|
||
| // Release semaphore slot | ||
| select { | ||
| case <-ctx.Done(): | ||
| return | ||
| case <-sg.semaphore: | ||
| } | ||
| } | ||
|
|
||
| // Wait waits until the internal WaitGroup counter is zero. | ||
| func (sg *SemaphoreGroup) Wait() { | ||
| sg.waitGroup.Wait() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| package semaphoregroup | ||
|
|
||
| import ( | ||
| "context" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func TestSemaphoreGroup(t *testing.T) { | ||
| semGroup := NewSemaphoreGroup(2) | ||
|
|
||
| for i := 0; i < 5; i++ { | ||
| semGroup.Add(context.Background()) | ||
| go func(id int) { | ||
| defer semGroup.Done(context.Background()) | ||
|
|
||
| got := len(semGroup.semaphore) | ||
| if got == 0 { | ||
| t.Errorf("Expected semaphore length > 0 , got 0") | ||
| } | ||
|
|
||
| time.Sleep(time.Millisecond) | ||
| t.Logf("Goroutine %d is running\n", id) | ||
| }(i) | ||
| } | ||
|
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| semGroup.Wait() | ||
|
|
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| want := 0 | ||
| got := len(semGroup.semaphore) | ||
| if got != want { | ||
| t.Errorf("Expected semaphore length %d, got %d", want, got) | ||
| } | ||
| } | ||
|
|
||
| func TestSemaphoreGroupContext(t *testing.T) { | ||
| semGroup := NewSemaphoreGroup(1) | ||
| semGroup.Add(context.Background()) | ||
| ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second) | ||
| t.Cleanup(cancel) | ||
| rChan := make(chan struct{}) | ||
|
|
||
| go func() { | ||
| semGroup.Add(ctx) | ||
| rChan <- struct{}{} | ||
| }() | ||
| select { | ||
| case <-rChan: | ||
| case <-time.NewTimer(2 * time.Second).C: | ||
| t.Error("Adding to semaphore group should not block when context is not done") | ||
| } | ||
|
|
||
| semGroup.Done(context.Background()) | ||
|
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| ctxDone, cancelDone := context.WithTimeout(context.Background(), 1*time.Second) | ||
| t.Cleanup(cancelDone) | ||
| go func() { | ||
| semGroup.Done(ctxDone) | ||
| rChan <- struct{}{} | ||
| }() | ||
| select { | ||
| case <-rChan: | ||
| case <-time.NewTimer(2 * time.Second).C: | ||
| t.Error("Releasing from semaphore group should not block when context is not done") | ||
| } | ||
| } |