58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
package retryutil
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import (
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"fmt"
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"time"
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)
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type RetryTicker interface {
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Stop()
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Tick()
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}
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type Ticker struct {
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ticker *time.Ticker
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}
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func (t *Ticker) Stop() { t.ticker.Stop() }
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func (t *Ticker) Tick() { <-t.ticker.C }
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// Retry calls ConditionFunc until either:
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// * it returns boolean true
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// * a timeout expires
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// * an error occurs
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func Retry(interval time.Duration, timeout time.Duration, f func() (bool, error)) error {
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//TODO: make the retry exponential
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if timeout < interval {
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return fmt.Errorf("timout(%s) should be greater than interval(%v)", timeout, interval)
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}
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tick := &Ticker{time.NewTicker(interval)}
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return RetryWorker(interval, timeout, tick, f)
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}
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func RetryWorker(
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interval time.Duration,
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timeout time.Duration,
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tick RetryTicker,
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f func() (bool, error)) error {
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maxRetries := int(timeout / interval)
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defer tick.Stop()
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for i := 0; ; i++ {
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ok, err := f()
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if err != nil {
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return err
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}
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if ok {
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return nil
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}
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if i+1 == maxRetries {
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break
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}
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tick.Tick()
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}
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return fmt.Errorf("still failing after %d retries", maxRetries)
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}
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