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package common
import (
"log"
"time"
)
// AutoRetry retries the supplier automatically, with given time limit and interval.
// If maximum retry time limit is reached and the supplier still fails,
// the last error will be returned.
// If logger is not nil, retry information will be printed to it.
func AutoRetry[T any](
supplier func() (T, error),
maxRetryTimes int,
retryInterval time.Duration,
logger *log.Logger) (T, error) {
var err error
for i := 0; i < maxRetryTimes; i++ {
ret, err := supplier()
if err != nil {
if logger != nil {
logger.Printf("Try %v/%v (sleep %vs): %v\n",
i, maxRetryTimes, retryInterval, err)
}
time.Sleep(retryInterval)
continue
}
// success
return ret, nil
}
if logger != nil {
logger.Printf("Max retry times reached, but it still fails. Last error: %v", err)
}
return *new(T), err
}
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