Asyncapi::Server is a Rails engine that allows asynchronous responses for API calls made by Asyncapi::Client.

Add asyncapi-server into your Gemfile, bundle install, then run the following commands:

rails g asyncapi:server:config
rake asyncapi_server:install:migrations
rake db:migrate

Make sure you have :host in the default_url_options set up for your server. Example config/initializers/default_url_options.rb:

Rails.application.routes.default_url_options ||= {}
Rails.application.routes.default_url_options[:host] = ENV["HOST"]

In your controller where you want a create action:

# some_controller.rb
class SomeController < ApplicationController
  async :create, CreateSomething
end

Create the CreateSomething runner class that will be called in the background:

# create_something.rb
class CreateSomething
  def self.call(params)
    something = Something.new(params)

    # the last line in this method is sent back to Asyncapi::Client as the `message`
    if something.save
      something.to_json
    else
      something.errors.messages
    end
  end
end

If you use protected_attributes, in an initializer:

Asyncapi::Server::Job.attr_accessible :status, :callback_url, :class_name, :params, :secret

If you want to use this without asyncapi client, you need to prepare two things: the endpoint that asyncapi-server will reply to.

Create the job by POSTing the following to CreateSomething above:

{
  "job": {
    "callback_url": "https://myclient.com/jobs_callback",
    "params": {
      "name": "Something's name",
      "approved": true
    },
    "secret": "A secret unique to this job, so that you know what job the server is referring to"
  }
}

When the server is done processing, it will post something to your client. Your endpoint must accept the following json as the body:

{
  "job": {
    "status": "success",
    "message": "The output of the Runner class (i.e. `CreateSomething`)",
    "secret": "The secret you had sent earlier (this is how you can be sure it's not someone else updating your endpoint)",
  }
}

If you want to create an integration spec for you Asyncapi server endpoint, make sure you require the helper:

require "asyncapi/server/rspec"

When you make a request, instead of post, use asyncapi_post. Ex:

asyncapi_post("/api/v1/long_running_job", params: { name: "Compute" })

This helper calls post underneath but builds the request in a way that Asyncapi server understands.

• Run rake db:migrate && rake db:migrate RAILS_ENV=test
• Make changes
• rspec

Copyright (c) 2016 G5

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