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package common
import (
"context"
"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](
ctx context.Context,
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)
}
timer := time.NewTimer(retryInterval)
select {
case <-timer.C:
// time to have the next try
continue
case <-ctx.Done():
// context is cancelled
var zero T
return zero, ctx.Err()
}
}
// success
return ret, nil
}
if logger != nil {
logger.Printf("Max retry times reached, but it still fails. Last error: %v", err)
}
var zero T
return zero, err
}
|
