Class: MessageBus::Rack::Diagnostics

Inherits:
Object
  • Object
show all
Defined in:
lib/message_bus/rack/diagnostics.rb

Instance Method Summary collapse

Constructor Details

#initialize(app, config = {}) ⇒ Diagnostics

Returns a new instance of Diagnostics.



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# File 'lib/message_bus/rack/diagnostics.rb', line 5

def initialize(app, config = {})
  @app = app
  @bus = config[:message_bus] || MessageBus
end

Instance Method Details

#asset_contents(asset) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 26

def asset_contents(asset)
  File.open(asset_path(asset)).read
end

#asset_path(asset) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 30

def asset_path(asset)
  File.expand_path("../../../../assets/#{asset}", __FILE__)
end

#call(env) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 64

def call(env)

  return @app.call(env) unless env['PATH_INFO'].start_with? '/message-bus/_diagnostics'

  route = env['PATH_INFO'].split('/message-bus/_diagnostics')[1]

  if @bus.is_admin_lookup.nil? || !@bus.is_admin_lookup.call(env)
    return [403, {}, ['not allowed']]
  end

  return index unless route

  if route == '/discover'
    user_id = @bus.user_id_lookup.call(env)
    @bus.publish('/_diagnostics/discover', user_id: user_id)
    return [200, {}, ['ok']]
  end

  if route =~ /^\/hup\//
    hostname, pid = route.split('/hup/')[1].split('/')
    @bus.publish('/_diagnostics/hup', hostname: hostname, pid: pid.to_i)
    return [200, {}, ['ok']]
  end

  asset = route.split('/assets/')[1]
  if asset && !asset !~ /\//
    content = asset_contents(asset)
    split = asset.split('.')
    if split[1] == 'handlebars'
      content = translate_handlebars(split[0], content)
    end
    return [200, { 'content-type' => 'text/javascript;' }, [content]]
  end

  return [404, {}, ['not found']]
end

#file_hash(asset) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 21

def file_hash(asset)
  require 'digest/sha1'
  Digest::SHA1.hexdigest(asset_contents(asset))
end

#generate_script_tag(name) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 17

def  generate_script_tag(name)
  "<script src='/message-bus/_diagnostics/assets/#{name}?#{file_hash(name)}' type='text/javascript'></script>"
end

#indent(string) ⇒ Object

from ember-rails



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# File 'lib/message_bus/rack/diagnostics.rb', line 60

def indent(string)
  string.gsub(/$(.)/m, "\\1  ").strip
end

#index ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 34

def index
  html = <<HTML
<!DOCTYPE html>
<html>
<head>
</head>
<body>
  <div id="app"></div>
  #{js_asset "jquery-1.8.2.js"}
  #{js_asset "handlebars.js"}
  #{js_asset "ember.js"}
  #{js_asset "message-bus.js"}
  #{js_asset "application.handlebars"}
  #{js_asset "index.handlebars"}
  #{js_asset "application.js"}
</body>
</html>
HTML
  return [200, { "content-type" => "text/html;" }, [html]]
end

#js_asset(name) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 10

def js_asset(name)
  return generate_script_tag(name) unless @bus.cache_assets
  @@asset_cache ||= {}
  @@asset_cache[name] ||= generate_script_tag(name)
  @@asset_cache[name]
end

#translate_handlebars(name, content) ⇒ Object 



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# File 'lib/message_bus/rack/diagnostics.rb', line 55

def translate_handlebars(name, content)
  "Ember.TEMPLATES['#{name}'] = Ember.Handlebars.compile(#{indent(content).inspect});"
end