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Merge pull request #364 from projectdiscovery/feat-adapativewaitgroup
Adding Adaptive WaitGroup
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package sync | ||
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| // Extended version of https://github.com/remeh/sizedwaitgroup | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
| "sync" | ||
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| "github.com/eapache/channels" | ||
| ) | ||
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| type AdaptiveGroupOption func(*AdaptiveWaitGroup) error | ||
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| type AdaptiveWaitGroup struct { | ||
| Size int | ||
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| current *channels.ResizableChannel | ||
| wg sync.WaitGroup | ||
| } | ||
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| func WithSize(size int) AdaptiveGroupOption { | ||
| return func(wg *AdaptiveWaitGroup) error { | ||
| if size < 0 { | ||
| return errors.New("size must be positive") | ||
| } | ||
| wg.Size = size | ||
| return nil | ||
| } | ||
| } | ||
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| func New(options ...AdaptiveGroupOption) (*AdaptiveWaitGroup, error) { | ||
| wg := &AdaptiveWaitGroup{} | ||
| for _, option := range options { | ||
| if err := option(wg); err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
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| wg.current = channels.NewResizableChannel() | ||
| wg.current.Resize(channels.BufferCap(wg.Size)) | ||
| wg.wg = sync.WaitGroup{} | ||
| return wg, nil | ||
| } | ||
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| func (s *AdaptiveWaitGroup) Add() { | ||
| _ = s.AddWithContext(context.Background()) | ||
| } | ||
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| func (s *AdaptiveWaitGroup) AddWithContext(ctx context.Context) error { | ||
| select { | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| case s.current.In() <- struct{}{}: | ||
| break | ||
| } | ||
| s.wg.Add(1) | ||
| return nil | ||
| } | ||
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| func (s *AdaptiveWaitGroup) Done() { | ||
| <-s.current.Out() | ||
| s.wg.Done() | ||
| } | ||
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| func (s *AdaptiveWaitGroup) Wait() { | ||
| s.wg.Wait() | ||
| } | ||
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| func (s *AdaptiveWaitGroup) Resize(size int) { | ||
| s.current.Resize(channels.BufferCap(size)) | ||
| } |