CreateStreamIfAbsent or CreateOrUpdateStream api

[tamalsaha]

What motivated this proposal?

Please add an api that will create a Stream is not exists and return it if exists. Hence the CreateStreamIfAbsent api. This api is needed to auto create the stream from my application. It was surprising to not have this api.

CreateOrUpdateStream might nice to keeping in sync with the CreateOrUpdateConsumer api. Though, I have not felt th need for this api.

What is the proposed change?

Something like this is what I am doing.

func ensureStream(stream string, jsOpts ...jetstream.JetStreamOpt) (jetstream.Stream, error) {
	js, err := jetstream.New(mgr.nc, jsOpts...)
	if err != nil {
		return nil, err
	}

	s, err := js.Stream(context.TODO(), stream)
	if errors.Is(err, jetstream.ErrStreamNotFound) {
		s, err = js.CreateStream(context.TODO(), jetstream.StreamConfig{
			Name:     stream,
			Subjects: []string{stream + ".*"},
		})
	}
	return s, err
}

Who benefits from this change?

No response

What alternatives have you evaluated?

No response

[piotrpio]

Hey @tamalsaha, thanks for submitting the issue. CreateOrUpdateStream function was merged a momento ago: #1395

It will be included in the next release.