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50 lines
894 B
50 lines
894 B
package retry
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import (
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"errors"
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"time"
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)
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var (
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errorRetryFailed = errors.New("All retry attempts failed.")
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)
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// Strategy is a way to retry on a specific function.
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type Strategy interface {
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// On performs a retry on a specific function, until it doesn't return any error.
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On(func() error) error
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}
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type retryer struct {
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NextDelay func(int) int
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}
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// On implements Strategy.On.
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func (r *retryer) On(method func() error) error {
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attempt := 0
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for {
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err := method()
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if err == nil {
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return nil
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}
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delay := r.NextDelay(attempt)
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if delay < 0 {
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return errorRetryFailed
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}
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<-time.After(time.Duration(delay) * time.Millisecond)
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attempt++
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}
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}
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// Timed returns a retry strategy with fixed interval.
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func Timed(attempts int, delay int) Strategy {
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return &retryer{
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NextDelay: func(attempt int) int {
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if attempt >= attempts {
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return -1
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}
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return delay
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},
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}
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}
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