Middlewares example

middlewares_example.rb

class SalesForce
  def initialize(app)
    @app = app
  end

  def call(env)
    puts "SalesForce Handler"
    puts "SalesForce AXID found"
    env[:axids] << "AXID01234567890"
    env[:salesforce] = {customer: {}}
    @app.call(env)
  end
end

class Zuora
  def initialize(app)
    @app = app
  end

  def call(env)
    puts "Zuora Handler"

    env[:zuora] = {}
    @app.call(env)
  end
end

class NicodemusSubscriptions
  def initialize(app)
    @app = app
  end

  def call(env)
    puts "NicodemusSubscriptions Handler"
    env[:nicodemus_subscriptions] = {}
    @app.call(env)
  end
end

class B2Church
  def initialize(app)
    @app = app
  end

  def call(env)
    puts "B2Church Handler"
    env[:b2church] = {relevant_data: "Foo"}
    @app.call(env)
  end
end

stack = Middleware::Builder.new do |d|
  d.use SalesForce
  d.use Zuora
  d.use B2Church
  d.use NicodemusSubscriptions
end

stack.call({emails: ["foo@example.com"], axids: []})
#  Outputs this:
#=> SalesForce Handler
#=> SalesForce AXID found
#=> Zuora Handler
#=> B2Church Handler
#=> NicodemusSubscriptions Handler
#=> => {:emails=>["foo@example.com"],
#=>     :axids=>["AXID01234567890"],
#=>     :salesforce=>{:customer=>{}},
#=>     :zuora=>{},
#=>     :b2church=>{:relevant_data=>"Foo"},
#=>     :nicodemus_subscriptions=>{}}