Module: Legion::Transport::Routes

Extended by:
Logging::Helper
Defined in:
lib/legion/transport/routes.rb

Class Method Summary collapse

Class Method Details

.register_discovery(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 116

def self.register_discovery(app)
  app.get '/api/transport/exchanges' do
    klass = defined?(Legion::Transport::Exchange) ? Legion::Transport::Exchange : nil
    json_response(klass ? transport_subclasses(klass) : [])
  end

  app.get '/api/transport/queues' do
    klass = defined?(Legion::Transport::Queue) ? Legion::Transport::Queue : nil
    json_response(klass ? transport_subclasses(klass) : [])
  end
end

.register_helpers(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 24

def self.register_helpers(app)
  app.helpers Legion::Logging::Helper
  register_json_helpers(app)
  register_transport_helpers(app)
end

.register_json_helpers(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 30

def self.register_json_helpers(app)
  app.helpers do
    unless method_defined?(:json_response)
      define_method(:json_response) do |data, status_code: 200|
        content_type :json
        status status_code
        Legion::JSON.dump({ data: data })
      end
    end

    unless method_defined?(:json_error)
      define_method(:json_error) do |code, message, status_code: 400|
        content_type :json
        status status_code
        Legion::JSON.dump({ error: { code: code, message: message } })
      end
    end

    unless method_defined?(:parse_request_body)
      define_method(:parse_request_body) do
        raw = request.body.read
        return {} if raw.nil? || raw.empty?

        begin
          parsed = Legion::JSON.load(raw)
        rescue StandardError => e
          handle_exception(e, level: :warn, handled: true, operation: :parse_request_body)
          halt 400, { 'Content-Type' => 'application/json' },
               Legion::JSON.dump({ error: { code: 'invalid_json', message: 'request body is not valid JSON' } })
        end

        unless parsed.respond_to?(:transform_keys)
          halt 400, { 'Content-Type' => 'application/json' },
               Legion::JSON.dump({ error: { code:    'invalid_request_body',
                                            message: 'request body must be a JSON object' } })
        end

        parsed.transform_keys(&:to_sym)
      end
    end
  end
end

.register_publish(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 128

def self.register_publish(app)
  app.post '/api/transport/publish' do
    log.debug "API: POST /api/transport/publish params=#{params.keys}"
    body = parse_request_body
    unless body[:exchange]
      log.warn 'API POST /api/transport/publish returned 422: exchange is required'
      halt 422, json_error('missing_field', 'exchange is required', status_code: 422)
    end
    unless body[:routing_key]
      log.warn 'API POST /api/transport/publish returned 422: routing_key is required'
      halt 422, json_error('missing_field', 'routing_key is required', status_code: 422)
    end

    message = Legion::Transport::Messages::Direct.new(
      exchange: body[:exchange], routing_key: body[:routing_key], **(body[:payload] || {})
    )
    message.publish
    log.info "API: published message to exchange=#{body[:exchange]} routing_key=#{body[:routing_key]}"
    json_response({ published: true, exchange: body[:exchange], routing_key: body[:routing_key] }, status_code: 201)
  rescue StandardError => e
    handle_exception(e, level: :error, handled: true, operation: :transport_publish)
    json_error('publish_error', e.message, status_code: 500)
  end
end

.register_status(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 89

def self.register_status(app)
  app.get '/api/transport' do
    connected = begin
      Legion::Settings[:transport][:connected]
    rescue StandardError => e
      handle_exception(e, level: :warn, handled: true, operation: :transport_status_connected)
      false
    end
    session_open = begin
      Legion::Transport::Connection.session_open?
    rescue StandardError => e
      handle_exception(e, level: :warn, handled: true, operation: :transport_status_session_open)
      false
    end
    channel_open = begin
      Legion::Transport::Connection.channel_open?
    rescue StandardError => e
      handle_exception(e, level: :warn, handled: true, operation: :transport_status_channel_open)
      false
    end
    connector = defined?(Legion::Transport::TYPE) ? Legion::Transport::TYPE.to_s : 'unknown'

    json_response({ connected: connected, session_open: session_open,
                    channel_open: channel_open, connector: connector })
  end
end

.register_transport_helpers(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 73

def self.register_transport_helpers(app)
  app.helpers do
    unless method_defined?(:transport_subclasses)
      define_method(:transport_subclasses) do |base_class|
        ObjectSpace.each_object(Class)
                   .select { |klass| klass < base_class }
                   .map { |klass| { name: klass.name } }
                   .sort_by { |h| h[:name].to_s }
      rescue NameError => e
        handle_exception(e, level: :warn, handled: true, operation: :transport_subclasses)
        []
      end
    end
  end
end

.registered(app) ⇒ Object 



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# File 'lib/legion/transport/routes.rb', line 17

def self.registered(app)
  register_helpers(app)
  register_status(app)
  register_discovery(app)
  register_publish(app)
end