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