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make retry code context-aware. 

detect cancellation in backend, so that retry code does not keep trying
once user has hit ^c

gh-1434
This commit is contained in:
George Armhold 2017-12-01 07:46:20 -05:00
parent d886cb5c27
commit be24237063
1 changed files with 12 additions and 6 deletions
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18
internal/backend/backend_retry.go
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@ -33,15 +33,21 @@ func NewRetryBackend(be restic.Backend, maxTries int, report func(string, error,
}
}
func (be *RetryBackend) retry(msg string, f func() error) error {
return backoff.RetryNotify(f,
backoff.WithMaxTries(backoff.NewExponentialBackOff(), uint64(be.MaxTries)),
func (be *RetryBackend) retry(ctx context.Context, msg string, f func() error) error {
err := backoff.RetryNotify(f,
backoff.WithContext(backoff.WithMaxTries(backoff.NewExponentialBackOff(), uint64(be.MaxTries)), ctx),
func(err error, d time.Duration) {
if be.Report != nil {
be.Report(msg, err, d)
}
},
)
if errors.Cause(err) == context.Canceled {
return nil
}
return err
}
// Save stores the data in the backend under the given handle.
@ -60,7 +66,7 @@ func (be *RetryBackend) Save(ctx context.Context, h restic.Handle, rd io.Reader)
return errors.Errorf("reader is not at the beginning (pos %v)", pos)
}
return be.retry(fmt.Sprintf("Save(%v)", h), func() error {
return be.retry(ctx, fmt.Sprintf("Save(%v)", h), func() error {
_, err := seeker.Seek(0, io.SeekStart)
if err != nil {
return err
@ -87,7 +93,7 @@ func (be *RetryBackend) Save(ctx context.Context, h restic.Handle, rd io.Reader)
// is returned. rd must be closed after use. If an error is returned, the
// ReadCloser must be nil.
func (be *RetryBackend) Load(ctx context.Context, h restic.Handle, length int, offset int64) (rd io.ReadCloser, err error) {
err = be.retry(fmt.Sprintf("Load(%v, %v, %v)", h, length, offset),
err = be.retry(ctx, fmt.Sprintf("Load(%v, %v, %v)", h, length, offset),
func() error {
var innerError error
rd, innerError = be.Backend.Load(ctx, h, length, offset)
@ -99,7 +105,7 @@ func (be *RetryBackend) Load(ctx context.Context, h restic.Handle, length int, o
// Stat returns information about the File identified by h.
func (be *RetryBackend) Stat(ctx context.Context, h restic.Handle) (fi restic.FileInfo, err error) {
err = be.retry(fmt.Sprintf("Stat(%v)", h),
err = be.retry(ctx, fmt.Sprintf("Stat(%v)", h),
func() error {
var innerError error
fi, innerError = be.Backend.Stat(ctx, h)