51 lines
847 B
Go
51 lines
847 B
Go
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package closer
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import (
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"context"
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"fmt"
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"log"
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"sync"
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)
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type Callback func(ctx context.Context) error
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type Closer struct {
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mutex sync.Mutex
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callbacks []Callback
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}
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func New() *Closer {
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return &Closer{}
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}
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func (receiver *Closer) Add(callback Callback) {
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receiver.mutex.Lock()
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defer receiver.mutex.Unlock()
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receiver.callbacks = append(receiver.callbacks, callback)
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}
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func (receiver *Closer) Close(ctx context.Context) error {
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receiver.mutex.Lock()
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defer receiver.mutex.Unlock()
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complete := make(chan struct{}, 1)
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go func() {
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for index, callback := range receiver.callbacks {
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if err := callback(ctx); err != nil {
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log.Printf("[! (%d)] %v", index, err)
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}
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}
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complete <- struct{}{}
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}()
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select {
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case <-complete:
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return nil
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case <-ctx.Done():
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return fmt.Errorf("shutdown cancelled: %v", ctx.Err())
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}
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}
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