Class: Slimmer::App

Inherits:
Object
  • Object
show all
Defined in:
lib/slimmer/app.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, *args, &block) ⇒ App

Returns a new instance of App.



8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
 
# File 'lib/slimmer/app.rb', line 8

def initialize(app, *args, &block)
  options = args.first || {}
  @app = app

  logger = options[:logger] || NullLogger.instance
  self.logger = logger

  if options.key? :template_path
    raise "Template path should not be used. Use asset_host instead."
  end

  unless options[:asset_host]
    options[:asset_host] = Plek.current.find("assets")
  end

  @skin = Skin.new options[:asset_host], options[:cache_templates], options[:prefix], :logger => logger
end

Instance Method Details

#admin(request, body) ⇒ Object 



58
59
60
 
# File 'lib/slimmer/app.rb', line 58

def admin(request,body)
  @skin.admin(request,body)
end

#call(env) ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/slimmer/app.rb', line 26

def call(env)
  logger.debug "Slimmer: capturing response"
  backend_response = @app.call(env)

  if in_development? and skip_slimmer_param?(env)
    logger.debug "Slimmer: Asked to skip slimmer via skip_slimmer param"
    return backend_response
  elsif skip_slimmer_header?(backend_response)
    logger.debug "Slimmer: Asked to skip slimmer via HTTP header"
    return backend_response
  else
    rewrite_response(env, backend_response)
  end
end

#content_length(rewritten_body) ⇒ Object 



77
78
79
80
81
 
# File 'lib/slimmer/app.rb', line 77

def content_length(rewritten_body)
  size = 0
  rewritten_body.each { |part| size += part.bytesize }
  size.to_s
end

#in_development? ⇒ Boolean

Returns:

  • (Boolean) 


41
42
43
 
# File 'lib/slimmer/app.rb', line 41

def in_development?
  ENV['RAILS_ENV'] == 'development'
end

#on_404(request, body) ⇒ Object 



66
67
68
 
# File 'lib/slimmer/app.rb', line 66

def on_404(request,body)
  @skin.error(request, '404', body)
end

#on_error(request, status, body) ⇒ Object 



62
63
64
 
# File 'lib/slimmer/app.rb', line 62

def on_error(request, status, body)
  @skin.error(request, '500', body)
end

#on_success(source_request, request, body) ⇒ Object 



54
55
56
 
# File 'lib/slimmer/app.rb', line 54

def on_success(source_request, request, body)
  @skin.success(source_request, request, body)
end

#rewrite_response(env, response_to_skin) ⇒ Object 



83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/slimmer/app.rb', line 83

def rewrite_response(env, response_to_skin)
  status, headers, app_body = response_to_skin
  logger.debug "Slimmer: constructing request object"
  source_request = Rack::Request.new(env)
  logger.debug "Slimmer: constructing request headers object"
  request = Rack::Request.new(headers)
  content_type = headers['Content-Type'] || headers['content-type']
  
  logger.debug "Slimmer: Content-Type: #{content_type}"
  if content_type =~ /text\/html/
    logger.debug "Slimmer: Status code = #{status}"
    case status.to_i
    when 200
      logger.debug "Slimmer: I will rewrite this request"
      logger.debug "Slimmer: #{TEMPLATE_HEADER} = #{headers[TEMPLATE_HEADER].inspect}"
      logger.debug "Slimmer: Request path = #{source_request.path.inspect}"
      if headers[TEMPLATE_HEADER] == 'admin' || source_request.path =~ /^\/admin(\/|$)/
        logger.debug "Slimmer: Rewriting this request as an admin request"
        rewritten_body = admin(request,s(app_body))
      else
        logger.debug "Slimmer: Rewriting this request as a public request"
        rewritten_body = on_success(source_request, request, s(app_body))
      end
    when 301, 302, 304
      logger.debug "Slimmer: I will not rewrite this request"
      rewritten_body = app_body
    when 404
      logger.debug "Slimmer: Rewriting this request as a 404 error"
      rewritten_body = on_404(request,s(app_body))
    else
      logger.debug "Slimmer: Rewriting this request as a generic error"
      rewritten_body = on_error(request,status,s(app_body))
    end
  else
    logger.debug "Slimmer: I will not rewrite this request"
    rewritten_body = app_body
  end
  rewritten_body = [rewritten_body] unless rewritten_body.respond_to?(:each)

  headers['Content-Length'] = content_length(rewritten_body)

  logger.debug "Slimmer: Returning final status, headers and body"
  [status, headers, rewritten_body]

rescue GdsApi::TimedOutException
  [503, {"Content-Type" => "text/plain"}, ["GDS API request timed out."]]
end

#s(body) ⇒ Object 



70
71
72
73
74
75
 
# File 'lib/slimmer/app.rb', line 70

def s(body)
  return body.to_s unless body.respond_to?(:each)
  b = ""
  body.each {|a| b << a }
  b
end

#skip_slimmer_header?(backend_response) ⇒ Boolean

Returns:

  • (Boolean) 


50
51
52
 
# File 'lib/slimmer/app.rb', line 50

def skip_slimmer_header?(backend_response)
  !! backend_response[1][SKIP_HEADER]
end

#skip_slimmer_param?(env) ⇒ Boolean

Returns:

  • (Boolean) 


45
46
47
48
 
# File 'lib/slimmer/app.rb', line 45

def skip_slimmer_param?(env)
  skip = Rack::Request.new(env).params['skip_slimmer']
  skip and skip.to_i > 0
end