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add retry with backoff function
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| package algorithms | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| "github.com/cenkalti/backoff" | ||
| ) | ||
|
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| func Retry(op func() error, maxTries uint64) (err error) { | ||
| b := backoff.NewExponentialBackOff() | ||
| br := withMaxRetries(b, maxTries) | ||
| return backoff.Retry(op, br) | ||
| } | ||
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| func withMaxRetries(b backoff.BackOff, max uint64) backoff.BackOff { | ||
| return &backOffTries{delegate: b, maxTries: max} | ||
| } | ||
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| type backOffTries struct { | ||
| delegate backoff.BackOff | ||
| maxTries uint64 | ||
| numTries uint64 | ||
| } | ||
|
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| func (b *backOffTries) NextBackOff() time.Duration { | ||
| if b.maxTries > 0 { | ||
| b.numTries++ | ||
| if b.maxTries <= b.numTries { | ||
| return backoff.Stop | ||
| } | ||
| } | ||
| return b.delegate.NextBackOff() | ||
| } | ||
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| func (b *backOffTries) Reset() { | ||
| b.numTries = 0 | ||
| b.delegate.Reset() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| package algorithms | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "github.com/stretchr/testify/assert" | ||
| "testing" | ||
| ) | ||
|
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| func TestRetryAlwaysFails(t *testing.T) { | ||
| var counter int | ||
| err := Retry(func() error { | ||
| counter++ | ||
| return fmt.Errorf("some error") | ||
| }, 2) | ||
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| assert.Error(t, err, "expected error") | ||
| assert.Equal(t, "some error", err.Error()) | ||
| assert.Equal(t, counter, 2) | ||
| } |
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