Class: MessageBus::Rack::Diagnostics

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

Overview

Accepts requests from clients interested in using diagnostics functionality

See Also:

Constant Summary collapse

JS_ASSETS = 
%w{
  jquery-1.8.2.js
  react.js
  react-dom.js
  babel.min.js
  message-bus.js
  application.jsx
}

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of Diagnostics.

Parameters:

  • app (Proc) —

    the rack app

  • config (Hash) (defaults to: {})

Options Hash (config):

  • :message_bus (MessageBus::Instance) — default: `MessageBus` —

    a specific instance of message_bus



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# File 'lib/message_bus/rack/diagnostics.rb', line 11

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

Instance Method Details

#call(env) ⇒ Object

Process an HTTP request from a subscriber client

Parameters:

  • env (Rack::Request::Env) —

    the request environment



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# File 'lib/message_bus/rack/diagnostics.rb', line 27

def call(env)
  return @app.call(env) unless env['PATH_INFO'].start_with? "#{@bus.base_route}message-bus/_diagnostics"

  route = env['PATH_INFO'].split("#{@bus.base_route}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 && JS_ASSETS.include?(asset)
    content = asset_contents(asset)
    return [200, { 'Content-Type' => 'application/javascript;charset=UTF-8' }, [content]]
  end

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