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Merge pull request #8 from tonistiigi/tonistiigi/request-retry
handle GitHub rate limiting with retries
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package actionscache | ||
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| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
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| "github.com/pkg/errors" | ||
| ) | ||
|
|
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| const maxBackoff = time.Second * 90 | ||
| const minBackoff = time.Second * 1 | ||
|
|
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| var defaultBackoffPool = &BackoffPool{} | ||
|
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| type BackoffPool struct { | ||
| mu sync.Mutex | ||
| queue []chan struct{} | ||
| timer *time.Timer | ||
| backoff time.Duration | ||
| target time.Time | ||
| } | ||
|
|
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| func (b *BackoffPool) Wait(ctx context.Context, timeout time.Duration) error { | ||
| b.mu.Lock() | ||
| if b.timer == nil { | ||
| b.mu.Unlock() | ||
| return nil | ||
| } | ||
|
|
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| done := make(chan struct{}) | ||
| b.queue = append(b.queue, done) | ||
|
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| b.mu.Unlock() | ||
|
|
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| select { | ||
| case <-ctx.Done(): | ||
| return ctx.Err() | ||
| case <-done: | ||
| return nil | ||
| case <-time.After(timeout): | ||
| return errors.Errorf("maximum timeout reached") | ||
| } | ||
| } | ||
|
|
||
| func (b *BackoffPool) Reset() { | ||
| b.mu.Lock() | ||
| b.reset() | ||
| b.backoff = 0 | ||
| b.mu.Unlock() | ||
| } | ||
| func (b *BackoffPool) reset() { | ||
| for _, done := range b.queue { | ||
| close(done) | ||
| } | ||
| b.queue = nil | ||
| if b.timer != nil { | ||
| b.timer.Stop() | ||
| b.timer = nil | ||
| } | ||
| } | ||
|
|
||
| func (b *BackoffPool) trigger(t *time.Timer) { | ||
| b.mu.Lock() | ||
| if b.timer != t { | ||
| // this timer is not the current one | ||
| b.mu.Unlock() | ||
| return | ||
| } | ||
|
|
||
| b.reset() | ||
| b.backoff = b.backoff * 2 | ||
| if b.backoff > maxBackoff { | ||
| b.backoff = maxBackoff | ||
| } | ||
| b.mu.Unlock() | ||
| } | ||
|
|
||
| func (b *BackoffPool) Delay() { | ||
| b.mu.Lock() | ||
| if b.timer != nil { | ||
| minTime := time.Now().Add(minBackoff) | ||
| if b.target.Before(minTime) { | ||
| b.target = minTime | ||
| b.timer.Stop() | ||
| b.setupTimer() | ||
| } | ||
| b.mu.Unlock() | ||
| return | ||
| } | ||
|
|
||
| if b.backoff == 0 { | ||
| b.backoff = minBackoff | ||
| } | ||
|
|
||
| b.target = time.Now().Add(b.backoff) | ||
| b.setupTimer() | ||
|
|
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| b.mu.Unlock() | ||
| } | ||
|
|
||
| func (b *BackoffPool) setupTimer() { | ||
| var t *time.Timer | ||
| b.timer = time.AfterFunc(time.Until(b.target), func() { | ||
| b.trigger(t) | ||
| }) | ||
| t = b.timer | ||
| } |