Just getting started with golang - how do I send data from my Rails app to a golang program?

Let's say I'm writing a new dating site in Ruby on Rails, but I want to run the matching algorithm in a golang routine because it's a lot data and Ruby isn't very performant with that sort of thing.

I have data for each user in the form -

[
  "1" => {
    name: "Regina Phalange",
    age: "33",
    interests: [
      "golang",
      "surfing",
      "guitar hero"
    ]
  }
  "2" => {
    name: "Seymour Butts",
    age: "32",
    interests: [
      "sports",
      "calculus",
      "hanging with tha homies"
    ]
  }
]

And let's say I'm running on Heroku - 1 dyno runs my RoR app, the other runs my Go instance.

What's the best way to send data back and forth between these two apps? Should I set up an HTTP endpoint on either end and POST the data back and forth? Should I dump all this large amount of JSON data to a file and send the file over?

I'm fairly new to golang and was just curious what the best practices here are.

Thank you for the help!

Yes, and no, ideally both apps should have access to the same database, post the request to go, and proxy the responsa back to the client. If the load is big, and the fact that this is not real-time information you may run scheduled jobs to calculate them, that way in the future you can scale to hadoop or cassandra.

You can build a shared library and use it with Ruby-FFI. Give it a read: https://c7.se/go-and-ruby-ffi/

If you want an asynchronous solution:
http://redistogo.com/documentation/resque
https://github.com/benmanns/goworker

For synchronous, a HTTP call should be good.