Module: Percy

Defined in:
lib/percy.rb,
lib/version.rb

Constant Summary collapse

CLIENT_INFO = 
"percy-selenium-ruby/#{VERSION}".freeze
ENV_INFO = 
"selenium/#{Selenium::WebDriver::VERSION} ruby/#{RUBY_VERSION}".freeze
PERCY_DEBUG = 
ENV['PERCY_LOGLEVEL'] == 'debug'
PERCY_SERVER_ADDRESS = 
ENV['PERCY_SERVER_ADDRESS'] || 'http://localhost:5338'
LABEL = 
"[\u001b[35m" + (PERCY_DEBUG ? 'percy:ruby' : 'percy') + "\u001b[39m]"
RESONSIVE_CAPTURE_SLEEP_TIME = 
ENV['RESONSIVE_CAPTURE_SLEEP_TIME']
VERSION = 
'1.1.0'.freeze

Class Method Summary collapse

Class Method Details

._clear_cache! ⇒ Object 



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# File 'lib/percy.rb', line 218

def self._clear_cache!
  @percy_dom = nil
  @percy_enabled = nil
  @eligible_widths = nil
  @cli_config = nil
end

.capture_responsive_dom(driver, options) ⇒ Object 



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# File 'lib/percy.rb', line 100

def self.capture_responsive_dom(driver, options)
  widths = get_widths_for_multi_dom(options)
  dom_snapshots = []
  window_size = get_browser_instance(driver).window.size
  current_width = window_size.width
  current_height = window_size.height
  last_window_width = current_width
  resize_count = 0
  driver.execute_script('PercyDOM.waitForResize()')

  widths.each do |width|
    if last_window_width != width
      resize_count += 1
      change_window_dimension_and_wait(driver, width, current_height, resize_count)
      last_window_width = width
    end

    sleep(RESONSIVE_CAPTURE_SLEEP_TIME.to_i) if defined?(RESONSIVE_CAPTURE_SLEEP_TIME)

    dom_snapshot = get_serialized_dom(driver, options)
    dom_snapshot['width'] = width
    dom_snapshots << dom_snapshot
  end

  change_window_dimension_and_wait(driver, current_width, current_height, resize_count + 1)
  dom_snapshots
end

.change_window_dimension_and_wait(driver, width, height, resize_count) ⇒ Object 



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# File 'lib/percy.rb', line 78

def self.change_window_dimension_and_wait(driver, width, height, resize_count)
  begin
    if driver.capabilities.browser_name == 'chrome' && driver.respond_to?(:execute_cdp)
      driver.execute_cdp('Emulation.setDeviceMetricsOverride', {
                           height: height, width: width, deviceScaleFactor: 1, mobile: false,
                         },)
    else
      get_browser_instance(driver).window.resize_to(width, height)
    end
  rescue StandardError => e
    log("Resizing using cdp failed, falling back to driver for width #{width} #{e}", 'debug')
    get_browser_instance(driver).window.resize_to(width, height)
  end

  begin
    wait = Selenium::WebDriver::Wait.new(timeout: 1)
    wait.until { driver.execute_script('return window.resizeCount') == resize_count }
  rescue Selenium::WebDriver::Error::TimeoutError
    log("Timed out waiting for window resize event for width #{width}", 'debug')
  end
end

.fetch(url, data = nil) ⇒ Object

Make an HTTP request (GET,POST) using Ruby’s Net::HTTP. If ‘data` is present, `fetch` will POST as JSON.



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# File 'lib/percy.rb', line 198

def self.fetch(url, data = nil)
  uri = URI("#{PERCY_SERVER_ADDRESS}/#{url}")

  response = if data
    http = Net::HTTP.new(uri.host, uri.port)
    http.read_timeout = 600 # seconds
    request = Net::HTTP::Post.new(uri.path)
    request.body = data.to_json
    http.request(request)
  else
    Net::HTTP.get_response(uri)
  end

  unless response.is_a? Net::HTTPSuccess
    raise StandardError, "Failed with HTTP error code: #{response.code}"
  end

  response
end

.fetch_percy_dom ⇒ Object

Fetch the @percy/dom script, caching the result so it is only fetched once



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# File 'lib/percy.rb', line 174

def self.fetch_percy_dom
  return @percy_dom unless @percy_dom.nil?

  response = fetch('percy/dom.js')
  @percy_dom = response.body
end

.get_browser_instance(driver) ⇒ Object 



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# File 'lib/percy.rb', line 48

def self.get_browser_instance(driver)
  # this means it is a capybara session
  if driver.respond_to?(:driver) && driver.driver.respond_to?(:browser)
    return driver.driver.browser.manage
  end

  driver.manage
end

.get_serialized_dom(driver, options) ⇒ Object 



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# File 'lib/percy.rb', line 57

def self.get_serialized_dom(driver, options)
  dom_snapshot = driver.execute_script("return PercyDOM.serialize(#{options.to_json})")

  dom_snapshot['cookies'] = get_browser_instance(driver).all_cookies
  dom_snapshot
end

.get_widths_for_multi_dom(options) ⇒ Object 



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# File 'lib/percy.rb', line 64

def self.get_widths_for_multi_dom(options)
  user_passed_widths = options[:widths] || []

  # Deep copy mobile widths otherwise it will get overridden
  all_widths = @eligible_widths['mobile']&.dup || []
  if user_passed_widths.any?
    all_widths.concat(user_passed_widths)
  else
    all_widths.concat(@eligible_widths['config'] || [])
  end

  all_widths.uniq
end

.log(msg, lvl = 'info') ⇒ Object 



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# File 'lib/percy.rb', line 181

def self.log(msg, lvl = 'info')
  msg = "#{LABEL} #{msg}"
  begin
    fetch('percy/log', {message: msg, level: lvl})
  rescue StandardError => e
    if PERCY_DEBUG
      puts "Sending log to CLI Failed #{e}"
    end
  ensure
    if lvl != 'debug' || PERCY_DEBUG
      puts msg
    end
  end
end

.percy_enabled? ⇒ Boolean

Determine if the Percy server is running, caching the result so it is only checked once

Returns:

  • (Boolean) 


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# File 'lib/percy.rb', line 138

def self.percy_enabled?
  return @percy_enabled unless @percy_enabled.nil?

  begin
    response = fetch('percy/healthcheck')
    version = response['x-percy-core-version']

    if version.nil?
      log('You may be using @percy/agent ' \
          'which is no longer supported by this SDK. ' \
          'Please uninstall @percy/agent and install @percy/cli instead. ' \
          'https://www.browserstack.com/docs/percy/migration/migrate-to-cli')
      @percy_enabled = false
      return false
    end

    if version.split('.')[0] != '1'
      log("Unsupported Percy CLI version, #{version}")
      @percy_enabled = false
      return false
    end

    response_body = JSON.parse(response.body)
    @eligible_widths = response_body['widths']
    @cli_config = response_body['config']
    @percy_enabled = true
    true
  rescue StandardError => e
    log('Percy is not running, disabling snapshots')
    log(e, 'debug')
    @percy_enabled = false
    false
  end
end

.responsive_snapshot_capture?(options) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/percy.rb', line 128

def self.responsive_snapshot_capture?(options)
  # Don't run responsive snapshot capture when defer uploads is enabled
  return false if @cli_config&.dig('percy', 'deferUploads')

  options[:responsive_snapshot_capture] ||
    options[:responsiveSnapshotCapture] ||
    @cli_config&.dig('snapshot', 'responsiveSnapshotCapture')
end

.snapshot(driver, name, options = {}) ⇒ Object

Take a DOM snapshot and post it to the snapshot endpoint



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# File 'lib/percy.rb', line 17

def self.snapshot(driver, name, options = {})
  return unless percy_enabled?

  begin
    driver.execute_script(fetch_percy_dom)
    dom_snapshot = if responsive_snapshot_capture?(options)
      capture_responsive_dom(driver, options)
    else
      get_serialized_dom(driver, options)
    end

    response = fetch('percy/snapshot',
      name: name,
      url: driver.current_url,
      dom_snapshot: dom_snapshot,
      client_info: CLIENT_INFO,
      environment_info: ENV_INFO,
      **options,)

    unless response.body.to_json['success']
      raise StandardError, data['error']
    end

    body = JSON.parse(response.body)
    body['data']
  rescue StandardError => e
    log("Could not take DOM snapshot '#{name}'")
    log(e, 'debug')
  end
end