Class: Maze::Servlets::ReflectiveServlet

Inherits:
BaseServlet
  • Object
show all
Defined in:
lib/maze/servlets/reflective_servlet.rb

Overview

Receives HTTP requests and responds according to the parameters given, which are:

  • delay_ms - milliseconds to wait before responding

  • status - HTTP response code

For GET requests these are expected to passed as GET parameters, for POST requests they are expected to be given as JSON fields.

Constant Summary collapse

REFLECTION_REQUEST_TYPE = 
'reflection'

Instance Method Summary collapse

Instance Method Details

#do_GET(request, response) ⇒ Object

Accepts a GET request to provide a reflective response to.

Parameters:

  • request (HTTPRequest) —

    The incoming GET request

  • response (HTTPResponse) —

    The response to return



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# File 'lib/maze/servlets/reflective_servlet.rb', line 20

def do_GET(request, response)
  delay_ms = request.query['delay_ms']
  status = request.query['status']

  logged_request = {
    body: {},
    query: Rack::Utils.parse_nested_query(request.query_string),
    request: request,
    response: response,
    method: 'GET'
  }
  Server.list_for(REFLECTION_REQUEST_TYPE).add(logged_request)

  reflect response, delay_ms, status
end

#do_OPTIONS(request, response) ⇒ Object

Logs and returns a set of valid headers for this servlet.

Parameters:

  • request (HTTPRequest) —

    The incoming GET request

  • response (HTTPResponse) —

    The response to return



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# File 'lib/maze/servlets/reflective_servlet.rb', line 88

def do_OPTIONS(request, response)
  super

  response.header['Access-Control-Allow-Methods'] = 'GET, POST, OPTIONS'
end

#do_POST(request, response) ⇒ Object

Accepts a POST request to provide a reflective response to.

Parameters:

  • request (HTTPRequest) —

    The incoming GET request

  • response (HTTPResponse) —

    The response to return



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# File 'lib/maze/servlets/reflective_servlet.rb', line 40

def do_POST(request, response)

  content_type = request['Content-Type']

  # For JSON, pull the instructions from the body.  Otherwise, take them from the query string.
  if content_type == 'application/json'
    body = JSON.parse(request.body)
    delay_ms = body['delay_ms']
    status = body['status']
  else
    query = Rack::Utils.parse_nested_query(request.query_string)
    body = {}
    delay_ms = query['delay_ms']
    status = query['status']
  end

  logged_request = {
    body: body,
    request: request,
    response: response,
    method: 'POST'
  }
  logged_request[:query] = query if query
  Server.list_for(REFLECTION_REQUEST_TYPE).add(logged_request)

  reflect response, delay_ms, status
rescue JSON::ParserError => e
  Bugsnag.notify e
  msg = "Unable to parse request as JSON: #{e.message}"
  $logger.error msg
  response.status = 418
rescue StandardError => e
  Bugsnag.notify e
  $logger.error "Invalid request to reflective servlet: #{e.message}"
  response.status = 500
end

#reflect(response, delay_ms, status) ⇒ Object 



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# File 'lib/maze/servlets/reflective_servlet.rb', line 77

def reflect(response, delay_ms, status)
  sleep delay_ms.to_i / 1000 unless delay_ms.nil?
  response.status = status || 200
  response.header['Access-Control-Allow-Origin'] = '*'
  response.body = "Returned status #{status} after waiting #{delay_ms} ms"
end