Class: Angelo::Responder

Inherits:
Object
  • Object
show all
Includes:
Celluloid::Logger
Defined in:
lib/angelo/responder.rb,
lib/angelo/responder/websocket.rb,
lib/angelo/responder/eventsource.rb

Direct Known Subclasses

Eventsource, Websocket

Defined Under Namespace

Classes: Eventsource, Websocket

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Responder

Returns a new instance of Responder.



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# File 'lib/angelo/responder.rb', line 37

def initialize &block
  @response_handler = Base.compile! :request_handler, &block
end

Class Attribute Details

.default_headers ⇒ Object 



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# File 'lib/angelo/responder.rb', line 22

def default_headers
  @default_headers ||= DEFAULT_RESPONSE_HEADERS
  @default_headers
end

Instance Attribute Details

#base=(value) ⇒ Object (writeonly)

Sets the attribute base

Parameters:

  • value —

    the value to set the attribute base to.



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# File 'lib/angelo/responder.rb', line 35

def base=(value)
  @base = value
end

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/angelo/responder.rb', line 33

def connection
  @connection
end

#request ⇒ Object

Returns the value of attribute request.



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# File 'lib/angelo/responder.rb', line 34

def request
  @request
end

Class Method Details

.content_type(type) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 10

def content_type type
  dhs = self.default_headers
  case type
  when :json
    self.default_headers = dhs.merge CONTENT_TYPE_HEADER_KEY => JSON_TYPE
  when :html
    self.default_headers = dhs.merge CONTENT_TYPE_HEADER_KEY => HTML_TYPE
  else
    raise ArgumentError.new "invalid content_type: #{type}"
  end
end

.symhash ⇒ Object 



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# File 'lib/angelo/responder.rb', line 27

def symhash
  Hash.new {|hash,key| hash[key.to_s] if Symbol === key }
end

Instance Method Details

#content_type(type) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 107

def content_type type
  case type
  when :json
    headers CONTENT_TYPE_HEADER_KEY => JSON_TYPE
  when :html
    headers CONTENT_TYPE_HEADER_KEY => HTML_TYPE
  when :js
    headers CONTENT_TYPE_HEADER_KEY => JS_TYPE
  else
    raise ArgumentError.new "invalid content_type: #{type}"
  end
end

#error_message(_error) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 87

def error_message _error
  case
  when respond_with?(:json)
    { error: _error.message }.to_json
  else
    case _error.message
    when Hash
      _error.message.to_s
    else
      _error.message
    end
  end
end

#handle_error(_error, type = :internal_server_error, report = @base.report_errors?) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 76

def handle_error _error, type = :internal_server_error, report = @base.report_errors?
  err_msg = error_message _error
  Angelo.log @connection, @request, nil, type, err_msg.size
  @connection.respond type, headers, err_msg
  @connection.close
  if report
    error "#{_error.class} - #{_error.message}"
    ::STDERR.puts _error.backtrace
  end
end

#handle_request ⇒ Object 



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# File 'lib/angelo/responder.rb', line 49

def handle_request
  if @response_handler
    @base.filter :before
    @body = catch(:halt) { @response_handler.bind(@base).call || EMPTY_STRING }

    # TODO any real reason not to run afters with SSE?
    case @body
    when HALT_STRUCT
      @base.filter :after if @body.body != :sse
    else
      @base.filter :after
    end

    respond
  else
    raise NotImplementedError
  end
rescue JSON::ParserError => jpe
  handle_error jpe, :bad_request
rescue FormEncodingError => fee
  handle_error fee, :bad_request
rescue RequestError => re
  handle_error re, re.type
rescue => e
  handle_error e
end

#headers(hs = nil) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 101

def headers hs = nil
  @headers ||= self.class.default_headers.dup
  @headers.merge! hs if hs
  @headers
end

#redirect(url) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 198

def redirect url
  @redirect = url
end

#respond ⇒ Object 



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# File 'lib/angelo/responder.rb', line 142

def respond
  status = nil
  case @body
  when HALT_STRUCT
    status = @body.status
    @body = @body.body
    @body = nil if @body == :sse
    if Hash === @body
      @body = {error: @body} if status != :ok or status < 200 && status >= 300
      @body = @body.to_json if respond_with? :json
    end

  when String
    JSON.parse @body if respond_with? :json # for the raises

  when Hash
    raise 'html response requires String' if respond_with? :html
    @body = @body.to_json if respond_with? :json

  when NilClass
    @body = EMPTY_STRING

  else
    unless @chunked and @body.respond_to? :each
      raise RequestError.new "what is this? #{@body}"
    end
  end

  status ||= @redirect.nil? ? :ok : :moved_permanently
  headers LOCATION_HEADER_KEY => @redirect if @redirect

  if @chunked
    Angelo.log @connection, @request, nil, status
    @request.respond status, headers
    err = nil
    begin
      @body.each do |r|
        r = r.to_json + NEWLINE if respond_with? :json
        @request << r
      end
    rescue => e
      err = e
    ensure
      @request.finish_response
      raise err if err
    end
  else
    size = @body.nil? ? 0 : @body.size
    Angelo.log @connection, @request, nil, status, size
    @request.respond status, headers, @body
  end

rescue => e
  handle_error e, :internal_server_error
end

#respond_with?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/angelo/responder.rb', line 133

def respond_with? type
  case headers[CONTENT_TYPE_HEADER_KEY]
  when JSON_TYPE
    type == :json
  else
    type == :html
  end
end

#transfer_encoding(*encodings) ⇒ Object 



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# File 'lib/angelo/responder.rb', line 120

def transfer_encoding *encodings
  encodings.flatten.each do |encoding|
    case encoding
    when :chunked
      @chunked = true
      headers transfer_encoding: :chunked
    # when :compress, :deflate, :gzip, :identity
    else
      raise ArgumentError.new "invalid transfer_conding: #{encoding}"
    end
  end
end