Example #1
// sendAndFill is a helper which sends the given batch and fills its results,
// returning the appropriate error which is either from the first failing call,
// or an "internal" error.
func sendAndFill(
	send func(roachpb.BatchRequest) (*roachpb.BatchResponse, *roachpb.Error), b *Batch,
) error {
	// Errors here will be attached to the results, so we will get them from
	// the call to fillResults in the regular case in which an individual call
	// fails. But send() also returns its own errors, so there's some dancing
	// here to do because we want to run fillResults() so that the individual
	// result gets initialized with an error from the corresponding call.
	var ba roachpb.BatchRequest
	// TODO(tschottdorf): this nonsensical copy is required since (at least at
	// the time of writing, the chunking and masking in DistSender operates on
	// the original data (as attested to by a whole bunch of test failures).
	ba.Requests = append([]roachpb.RequestUnion(nil), b.reqs...)
	ba.Header = b.Header
	b.response, b.pErr = send(ba)
	if b.pErr != nil {
		// Discard errors from fillResults.
		_ = b.fillResults()
		return b.pErr.GoError()
	if err := b.fillResults(); err != nil {
		b.pErr = roachpb.NewError(err)
		return err
	return nil
Example #2
// SendWrappedWith is a convenience function which wraps the request in a batch
// and sends it via the provided Sender and headers. It returns the unwrapped
// response or an error. It's valid to pass a `nil` context; an empty one is
// used in that case.
func SendWrappedWith(
	ctx context.Context, sender Sender, h roachpb.Header, args roachpb.Request,
) (roachpb.Response, *roachpb.Error) {
	ba := roachpb.BatchRequest{}
	ba.Header = h

	br, pErr := sender.Send(ctx, ba)
	if pErr != nil {
		return nil, pErr
	unwrappedReply := br.Responses[0].GetInner()
	header := unwrappedReply.Header()
	header.Txn = br.Txn
	return unwrappedReply, nil