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retry.go
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/
retry.go
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package retry
import (
"context"
"errors"
"time"
)
var (
ErrExceededRetryTimeout = errors.New("exceeded retry timeout")
ErrMaxRetryAttemptExceeded = errors.New("exceeded maximum retry attempts")
)
// Func represents the function to retry.
type Func func() (bool, error)
// Do retries the function passed for `maxRetryAttempt` attempts or
// cancels the execution when the time exceeds `retryTimeout` milliseconds.
func Do(f Func, maxRetryAttempt int, retryTimeout int) error {
ctx, cancel := context.WithTimeout(
context.Background(),
time.Duration(retryTimeout*int(time.Millisecond)),
)
defer cancel()
chErr := make(chan error)
go func() {
attempt := 1
for {
success, err := f()
if err != nil || success {
chErr <- err
return
}
if attempt == maxRetryAttempt {
cancel()
return
}
attempt++
}
}()
select {
case <-ctx.Done():
switch ctx.Err() {
case context.DeadlineExceeded:
return ErrExceededRetryTimeout
case context.Canceled:
return ErrMaxRetryAttemptExceeded
}
case err := <-chErr:
return err
}
return nil
}