Class: Jets::Mega::Request

Inherits:
Object
  • Object
show all
Extended by:
Memoist
Defined in:
lib/jets/mega/request.rb,
lib/jets/mega/request/source.rb

Defined Under Namespace

Classes: Source

Constant Summary collapse

JETS_OUTPUT = 
"/tmp/jets-output.log"

Instance Method Summary collapse

Constructor Details

#initialize(event, controller) ⇒ Request

Returns a new instance of Request.



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# File 'lib/jets/mega/request.rb', line 10

def initialize(event, controller)
  @event = event
  @controller = controller # Jets::Controller instance
end

Instance Method Details

#get_encoding(content_type) ⇒ Object 



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# File 'lib/jets/mega/request.rb', line 85

def get_encoding(content_type)
  default = Jets.config.encoding.default
  return default unless content_type

  md = content_type.match(/charset=(.+)/)
  return default unless md

  md[1]
end

#get_uri ⇒ Object 



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# File 'lib/jets/mega/request.rb', line 103

def get_uri
  url = "http://localhost:9292#{@controller.request.path}" # local rack server
  unless @controller.query_parameters.empty?
    # Thanks: https://stackoverflow.com/questions/798710/ruby-how-to-turn-a-hash-into-http-parameters
    query_string = Rack::Utils.build_nested_query(@controller.query_parameters)
    url += "?#{query_string}"
  end
  URI(url)
end

#http_class ⇒ Object

Rails sets _method=patch or _method=put as workaround Falls back to GET when testing in lambda console @event is GET, POST, PUT, DELETE, etc



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# File 'lib/jets/mega/request.rb', line 121

def http_class
  http_class = params['_method'] || @event['httpMethod'] || 'GET'
  http_class.capitalize!
  http_class
end

#params ⇒ Object 



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# File 'lib/jets/mega/request.rb', line 127

def params
  @controller.params(raw: true, path_parameters: false, body_parameters: true)
end

#proxy ⇒ Object 



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# File 'lib/jets/mega/request.rb', line 15

def proxy
  http_method = @event['httpMethod'] # GET, POST, PUT, DELETE, etc
  params = @controller.params(raw: true, path_parameters: false)

  uri = get_uri

  http = Net::HTTP.new(uri.host, uri.port)
  http.open_timeout = http.read_timeout = 60

  # Rails sets _method=patch or _method=put as workaround
  # Falls back to GET when testing in lambda console
  http_class = params['_method'] || http_method || 'GET'
  http_class.capitalize!

  request_class = "Net::HTTP::#{http_class}".constantize # IE: Net::HTTP::Get
  request = request_class.new(uri)

  # Set form data
  if %w[Post Patch Put].include?(http_class)
    params = HashConverter.encode(params)
    request.set_form_data(params)
  end

  # Set body info
  request.body = source.body
  request.content_length = source.content_length

  # Need to set headers after body and form_data for some reason
  request = set_headers!(request)

  # Make request
  response = send_request(http, request)

  puts_rack_output

  status = response.code.to_i
  headers = response.each_header.to_h
  encoding = get_encoding(headers['content-type'])
  body = response.body&.force_encoding(encoding)
  {
    status: status,
    headers: headers,
    body: body,
  }
end

#puts_rack_output ⇒ Object

Grab the rack output from the /tmp/jets-output.log and puts it back in the main process’ stdout



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# File 'lib/jets/mega/request.rb', line 97

def puts_rack_output
  return unless File.exist?(JETS_OUTPUT)
  puts IO.readlines(JETS_OUTPUT)
  File.truncate(JETS_OUTPUT, 0)
end

#send_request(http, request) ⇒ Object

Adds error handling in case the rack server has gone down. Will try to start the server back up if needed. Search CloudWatch logs for ‘Unable to send request’ to find for indication of this.



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# File 'lib/jets/mega/request.rb', line 63

def send_request(http, request)
  retries = 0
  max_retries = 30 # 15 seconds at a delay of 0.5s
  delay = 0.5

  begin
    http.request(request) # response
  rescue Errno::ECONNREFUSED, Errno::EAFNOSUPPORT
    puts "Unable to send request to localhost:9292. Will try to start the server with a delay of #{delay} and try again."
    Jets.start_rack_server

    sleep(delay)
    retries += 1
    if retries < max_retries
      retry
    else
      puts "Giving up on trying to send request to localhost:9292"
      raise # re-raise error
    end
  end
end

#set_headers!(request) ⇒ Object

Set request headers. Forwards original request info from remote API gateway. By this time, the server/api_gateway.rb middleware.



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# File 'lib/jets/mega/request.rb', line 134

def set_headers!(request)
  headers = @event['headers'] # from api gateway
  if headers # remote API Gateway
    # Forward headers from API Gateway over to the sub http request.
    # It's important to forward the headers. Here are some examples:
    #
    #   "Turbolinks-Referrer"=>"http://localhost:8888/posts/122",
    #   "Referer"=>"http://localhost:8888/posts/122",
    #   "Accept-Encoding"=>"gzip, deflate",
    #   "Accept-Language"=>"en-US,en;q=0.9,pt;q=0.8",
    #   "Cookie"=>"_demo_session=...",
    #   "If-None-Match"=>"W/\"9fa479205fc6d24ca826d46f1f6cf461\"",
    headers.each do |k,v|
      request[k] = v
    end

    # Note by the time headers get to rack later in the they get changed to:
    #
    #   request['X-Forwarded-Host'] vs env['HTTP_X_FORWARDED_HOST']
    #
    request['X-Forwarded-For'] = headers['X-Forwarded-For'] # "1.1.1.1, 2.2.2.2" # can be comma separated list
    request['X-Forwarded-Host'] = headers['Host'] # uhghn8z6t1.execute-api.us-east-1.amazonaws.com
    request['X-Forwarded-Port'] = headers['X-Forwarded-Port'] # 443
    request['X-Forwarded-Proto'] = headers['X-Forwarded-Proto'] # https # scheme
  end

  request
end

#source ⇒ Object 



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# File 'lib/jets/mega/request.rb', line 113

def source
  Source.new(@event)
end