Microservices Development Cookbook

How to do it...

1. Open the service object we created in the previous recipe. We'll modify the service object to be able to call an external microservice responsible for managing attachments. For the sake of simplicity, we'll use an HTTP client that is provided in the Ruby standard library. The service object should be in the app/services/attachments_service.rb file:

class AttachmentsService  BASE_URI = "http://attachment-service.yourorg.example.com/"  def upload(message_id, user_id, file_name, data, media_type)    body = {      user_id: user_id,      file_name: file_name,      data: StringIO.new(Base64.decode64(params[:file]      [:data]), 'rb'),      message: message_id,      media_type: media_type    }.to_json    uri = URI("#{BASE_URI}attachment") headers = { "Content-Type" => ...