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- // Copyright 2016 Google LLC
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package internal
-
- import (
- "time"
-
- gax "github.com/googleapis/gax-go"
-
- "golang.org/x/net/context"
- )
-
- // Retry calls the supplied function f repeatedly according to the provided
- // backoff parameters. It returns when one of the following occurs:
- // When f's first return value is true, Retry immediately returns with f's second
- // return value.
- // When the provided context is done, Retry returns with an error that
- // includes both ctx.Error() and the last error returned by f.
- func Retry(ctx context.Context, bo gax.Backoff, f func() (stop bool, err error)) error {
- return retry(ctx, bo, f, gax.Sleep)
- }
-
- func retry(ctx context.Context, bo gax.Backoff, f func() (stop bool, err error),
- sleep func(context.Context, time.Duration) error) error {
- var lastErr error
- for {
- stop, err := f()
- if stop {
- return err
- }
- // Remember the last "real" error from f.
- if err != nil && err != context.Canceled && err != context.DeadlineExceeded {
- lastErr = err
- }
- p := bo.Pause()
- if cerr := sleep(ctx, p); cerr != nil {
- if lastErr != nil {
- return Annotatef(lastErr, "retry failed with %v; last error", cerr)
- }
- return cerr
- }
- }
- }
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