Class: RightDevelop::Testing::Server::MightApi::App::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/right_develop/testing/servers/might_api/app/base.rb

Direct Known Subclasses

Echo, Playback, Record

Defined Under Namespace

Classes: MightError, MissingRoute

Constant Summary collapse

MAX_REDIRECTS =

500 after so many redirects

10

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(state_file_name) ⇒ Base

Returns a new instance of Base.



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 41

def initialize(state_file_name)
  @config = ::RightDevelop::Testing::Server::MightApi::Config
  @logger = ::RightDevelop::Testing::Server::MightApi.logger

  @state_file_path = state_file_name ? ::File.join(@config.fixtures_dir, state_file_name) : nil
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 39

def config
  @config
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 39

def logger
  @logger
end

#state_file_path ⇒ Object (readonly)

Returns the value of attribute state_file_path.



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 39

def state_file_path
  @state_file_path
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 48

def call(env)
  env['rack.logger'] ||= logger

  # read body from stream.
  request = ::Rack::Request.new(env)
  body = request.body.read

  # proxy any headers from env starting with HTTP_
  headers = env.inject({}) do |r, (k,v)|
    # note that HTTP_HOST refers to this proxy server instead of the
    # proxied target server. in the case of AWS authentication, it is
    # necessary to pass the value through unmodified or else AWS auth
    # fails.
    if k.start_with?('HTTP_')
      r[k[5..-1]] = v
    end
    r
  end

  # special cases.
  ['ACCEPT', 'CONTENT_TYPE', 'CONTENT_LENGTH', 'USER_AGENT'].each do |key|
    headers[key] = env[key] unless env[key].to_s.empty?
  end

  # handler
  verb = request.request_method
  uri = ::URI.parse(request.url)
  handle_request(env, verb, uri, headers, body)
rescue MissingRoute => e
  message = "#{e.class} #{e.message}"
  logger.error(message)
  if config.routes.empty?
    logger.error("No routes configured.")
  else
    logger.error("The following routes are configured:")
    config.routes.keys.each do |prefix|
      logger.error("  #{prefix}...")
    end
  end

  # not a 404 because this is a proxy/stub service and 40x might appear to
  # have come from a proxied request/response whereas 500 is never an
  # expected response.
  internal_server_error(message)
rescue ::RightDevelop::Testing::Client::Rest::Request::Playback::PlaybackError => e
  # response has not been recorded.
  message = e.message
  trace = [e.class.name] + (e.backtrace || [])
  logger.error(message)
  logger.debug(trace.join("\n"))
  internal_server_error(message)
rescue ::Exception => e
  message = "Unhandled exception: #{e.class} #{e.message}"
  trace = e.backtrace || []
  if logger
    logger.error(message)
    logger.debug(trace.join("\n"))
  else
    env['rack.errors'].puts(message)
    env['rack.errors'].puts(trace.join("\n"))
  end
  internal_server_error(message)
end

#find_route(uri) ⇒ Array

Returns pair of [prefix, data] or nil.

Parameters:

  • uri (URI) —

    path to find

Returns:

  • (Array) —

    pair of [prefix, data] or nil



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 236

def find_route(uri)
  find_path = uri.path
  logger.debug "Route URI path to match = #{find_path.inspect}"
  config.routes.find do |prefix, data|
    matched = find_path.start_with?(prefix)
    logger.debug "Tried = #{prefix.inspect}, matched = #{matched}"
    matched
  end
end

#handle_request(env, verb, uri, headers, body) ⇒ TrueClass

Handler.

Parameters:

  • env (Hash) —

    from rack

  • verb (String) —

    as one of [‘GET’, ‘POST’, etc.]

  • uri (URI) —

    parsed from full url

  • headers (Hash) —

    for proxy call with any non-proxy data omitted

  • body (String) —

    streamed from payload or empty

Returns:

  • (TrueClass) —

    always true

Raises:

  • (::NotImplementedError) 


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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 121

def handle_request(env, verb, uri, headers, body)
  raise ::NotImplementedError, 'Must be overridden'
end

#internal_server_error(message) ⇒ Array

Returns rack-style response for 500.

Returns:

  • (Array) —

    rack-style response for 500



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 303

def internal_server_error(message)
  formal = <<EOF
MightAPI internal error

Problem:
  #{message}
EOF

  [
    500,
    {
      'Content-Type'   => 'text/plain',
      'Content-Length' => ::Rack::Utils.bytesize(formal).to_s
    },
    [formal]
  ]
end

#normalize_rack_response_headers(headers) ⇒ Hash

rack has a convention of newline-delimited header multi-values.

HACK: changes underscore to dash to defeat RestClient::AbstractResponse line 27 (on client side) from failing to parse cookies array; it incorrectly calls .inject on the stringized form instead of using the raw array form or parsing the cookies into a hash, but only if the raw name is ‘set_cookie’ (‘set-cookie’ is okay).

even wierder, on line 78 it assumes the raw name is ‘set-cookie’ and that works out for us here.

Parameters:

  • headers (Hash) —

    to normalize

Returns:

  • (Hash) —

    normalized headers



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 295

def normalize_rack_response_headers(headers)
  headers.inject({}) do |h, (k, v)|
    h[k.to_s.gsub('_', '-').downcase] = v.join("\n")
    h
  end
end

#proxy(request_class, verb, uri, headers, body, throttle = nil) ⇒ Array

Makes a proxied API request using the given request class.

Parameters:

  • request_class (Class) —

    for API call

  • verb (String) —

    as one of [‘GET’, ‘POST’, etc.]

  • uri (URI) —

    parsed from full url

  • headers (Hash) —

    for proxy call with any non-proxy data omitted

  • body (String) —

    streamed from payload or empty

  • throttle (Integer) (defaults to: nil) —

    for playback or nil

Returns:

  • (Array) —

    rack-style tuple of [code, headers, [body]]



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 135

def proxy(request_class, verb, uri, headers, body, throttle = nil)

  # check routes.
  unless route = find_route(uri)
    raise MissingRoute, "No route configured for #{uri.path.inspect}"
  end
  route_path, route_data = route
  response = nil
  max_redirects = MAX_REDIRECTS
  while response.nil? do
    request_proxy = nil
    begin
      proxied_url = ::File.join(route_data[:url], uri.path)
      unless uri.query.to_s.empty?
        proxied_url << '?' << uri.query
      end
      proxied_headers = proxy_headers(headers, route_data)

      request_options = {
        fixtures_dir:    config.fixtures_dir,
        logger:          logger,
        route_path:      route_path,
        route_data:      route_data,
        state_file_path: state_file_path,
        method:          verb.downcase.to_sym,
        url:             proxied_url,
        headers:         proxied_headers,
        payload:         body
      }
      request_options[:throttle] = throttle if throttle
      request_proxy = request_class.new(request_options)

      # log normalized data for obfuscation.
      logger.debug("normalized request headers = #{request_proxy.request_metadata.headers.inspect}")
      logger.debug("normalized request body:\n" << request_proxy.request_metadata.body)

      request_proxy.execute do |rest_response, rest_request, net_http_response, &block|

        # headers.
        response_headers = normalize_rack_response_headers(net_http_response.to_hash)

        # eliminate headers that interfere with response via proxy.
        %w(
          connection status content-encoding
        ).each { |key| response_headers.delete(key) }

        case response_code = Integer(rest_response.code)
        when 301, 302, 307
          raise RestClient::Exceptions::EXCEPTIONS_MAP[response_code].new(rest_response, response_code)
        else
          # special handling for chunked body.
          if response_headers['transfer-encoding'] == 'chunked'
            response_body = ::Rack::Chunked::Body.new([rest_response.body])
          else
            response_body = [rest_response.body]
          end
          response = [response_code, response_headers, response_body]
        end
      end

      # log normalized data for obfuscation.
      logger.debug("normalized response headers = #{request_proxy.response_metadata.headers.inspect}")
      logger.debug("normalized response body:\n" << request_proxy.response_metadata.body.to_s)
    rescue RestClient::RequestTimeout
      net_http_response = request_proxy.handle_timeout
      response_code = Integer(net_http_response.code)
      response_headers = normalize_rack_response_headers(net_http_response.to_hash)
      response_body = [net_http_response.body]
      response = [response_code, response_headers, response_body]
    rescue RestClient::Exception => e
      case e.http_code
      when 301, 302, 307
        max_redirects -= 1
        raise MightError.new('Exceeded max redirects') if max_redirects < 0
        if location = e.response.headers[:location]
          redirect_uri = ::URI.parse(location)
          redirect_uri.path = ''
          redirect_uri.query = nil
          logger.debug("#{e.message} from #{route_data[:url]} to #{redirect_uri}")
          route_data[:url] = redirect_uri.to_s

          # move to end of FIFO queue for retry.
          request_proxy.forget_outstanding_request
        else
          logger.debug("#{e.message} was missing expected location header.")
          raise
        end
      else
        raise
      end
    ensure
      # remove from FIFO queue in case of any unhandled error.
      request_proxy.forget_outstanding_request if request_proxy
    end
  end
  response
end

#proxy_headers(headers, route_data) ⇒ Mash

Sets the header style using configuration of the proxied service.

Parameters:

  • headers (Hash) —

    for proxy

  • route_data (Hash) —

    containing header configuration, if any

Returns:

  • (Mash) —

    proxied headers



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# File 'lib/right_develop/testing/servers/might_api/app/base.rb', line 252

def proxy_headers(headers, route_data)
  proxied = nil
  if proxy_data = route_data[:proxy]
    if header_data = proxy_data[:header]
      to_separator = (header_data[:separator] == :underscore) ? '_' : '-'
      from_separator = (to_separator == '-') ? '_' : '-'
      proxied = headers.inject(::Mash.new) do |h, (k, v)|
        k = k.to_s
        case header_data[:case]
        when nil
          k = k.gsub(from_separator, to_separator)
        when :lower
          k = k.downcase.gsub(from_separator, to_separator)
        when :upper
          k = k.upcase.gsub(from_separator, to_separator)
        when :capitalize
          k = k.split(/-|_/).map { |word| word.capitalize }.join(to_separator)
        else
          raise ::ArgumentError,
                "Unexpected header case: #{route_data.inspect}"
        end
        h[k] = v
        h
      end
    end
  end
  proxied || ::Mash.new(headers)
end