Class: Xray::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/xray/middleware.rb

Overview

This middleware is responsible for injecting xray.js, xray-backbone.js, and the Xray bar into the app’s pages. It also listens for requests to open files with the user’s editor.

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/xray/middleware.rb', line 11

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/xray/middleware.rb', line 15

def call(env)
  # Request for opening a file path.
  if env['PATH_INFO'] == OPEN_PATH
    req, res = Rack::Request.new(env), Rack::Response.new
    out, err, status = Xray.open_file(req.GET['path'])
    if status.success?
      res.status = 200
    else
      res.write out
      res.status = 500
    end
    res.finish
  elsif env['PATH_INFO'] == UPDATE_CONFIG_PATH
    req, res = Rack::Request.new(env), Rack::Response.new
    if req.post? && Xray.config.editor = req.POST['editor']
      res.status = 200
    else
      res.status = 400
    end
    res.finish
  # Inject xray.js and friends if this is a successful HTML response
  else
    status, headers, response = @app.call(env)

    if html_headers?(status, headers) && body = response_body(response)
      body = body.sub(/<body[^>]*>/) { "#{$~}\n#{xray_bar(response)}" }
      # Inject js script tags if assets are unbundled
      if Rails.application.config.assets.debug
        append_js!(body, 'jquery', 'xray')
        append_js!(body, 'backbone', 'xray-backbone')
      end
      content_length = body.bytesize.to_s
      # Modifying the original response obj maintains compatibility with other middlewares
      if ActionDispatch::Response === response
        response.body = [body]
        response.header['Content-Length'] = content_length
        response.to_a
      else
        headers['Content-Length'] = content_length
        [status, headers, [body]]
      end
    else
      [status, headers, response]
    end
  end
end