How to configure Hystrixjs in a node app?

Question

I am trying to configure hystrixJS into one of my nodejs app. I want to wrap up couple of external dependencies which my app is making. https://www.npmjs.com/package/hystrixjs

I read the readme but I still couldn't get how can i wrap my dependency call with this hystrix and how to configure a dashboard for this. If anyone already tried this before please give me some directions.

Thanks.

Answer 1

You can find a sample in the example app in the repo. But also feel free to submit a question on bitbucket and I will try to provide more examples.

In general you can wrap any function that returns a promise, it does not have to be a http request, although it is the most common use case.

The dashboard is not part of hystrix itself. The way it works, you can run a dashboard locally, see for instructions here and then add an endpoint to your application to expose the metrics. The example app shows how to do it:

function hystrixStreamResponse(request, response) {
    response.append('Content-Type', 'text/event-stream;charset=UTF-8');
    response.append('Cache-Control', 'no-cache, no-store, max-age=0, must-revalidate');
    response.append('Pragma', 'no-cache');
    return hystrixStream.toObservable().subscribe(
        function onNext(sseData) {
            response.write('data: ' + sseData + '\n\n');
        },
        function onError(error) {console.log(error);
        },
        function onComplete() {
            return response.end();
        }
    );
};

app.get('/api/hystrix.stream', hystrixStreamResponse);

You can then paste the url into the dashboard and it will display your commands.

Let me know if it helps