How to retry at a fixed interval?

[fighterhit]

How to retry 3 times with a fixed interval of 300ms? I found that when using the following code, the retry interval is 3s and the number of retries is 4.

        httpClient = resty.New().SetRetryCount(3).
                        SetRetryWaitTime(time.Millisecond * 200).
                        SetRetryMaxWaitTime(time.Millisecond * 200).
                        AddRetryCondition(func(response *resty.Response, err error) bool {
                        return response.IsError() || err != nil
                })

	resp, err := httpClient.R().SetHeaders(ws.headerMap).SetBody(body).SetResult(&ApiResult{}).Post(endpoint)
...

...
2024/08/28 22:10:03.012050 ERROR RESTY Post "http://xxx.yyy/api/v1/training/rl/alert": EOF, Attempt 1
2024/08/28 22:10:06.220787 ERROR RESTY Post "http://xxx.yyy/api/v1/training/rl/alert": EOF, Attempt 2
2024/08/28 22:10:09.430459 ERROR RESTY Post "http://xxx.yyy/api/v1/training/rl/alert": EOF, Attempt 3
2024/08/28 22:10:12.638736 ERROR RESTY Post "http://xxx.yyy/api/v1/training/rl/alert": EOF, Attempt 4
...

[jeevatkm]

@fighterhit Currently, Resty does Backoff retries, not a fixed interval. In the upcoming Resty v3, I aim to bring a pluggable retry algorithm.

[fighterhit]

@jeevatkm Thanks for the prompt reply. So now we can't actually control the retry interval, right? Another thing that confuses me is what is the meaning and difference between SetRetryWaitTime and SetRetryMaxWaitTime? How does it affect the retry?

[jeevatkm]

As I mentioned before. Resty uses a backoff mechanism for retry. The wait time (min) and max wait time are used to calculate the interval for the delay.

Please refer to unexported methods sleepDuration and jitterBackoff on the file retry.go.