Class: Ferrum::Browser::Process

Inherits:
Object
  • Object
show all
Defined in:
lib/ferrum/browser/process.rb

Constant Summary collapse

KILL_TIMEOUT = 
2
PROCESS_TIMEOUT = 
1
BROWSER_PATH = 
ENV["BROWSER_PATH"]
BROWSER_HOST = 
"127.0.0.1"
BROWSER_PORT = 
"0"
DEFAULT_OPTIONS = 
{
  "headless" => nil,
  "disable-gpu" => nil,
  "hide-scrollbars" => nil,
  "mute-audio" => nil,
  "enable-automation" => nil,
  "disable-web-security" => nil,
  "disable-session-crashed-bubble" => nil,
  "disable-breakpad" => nil,
  "disable-sync" => nil,
  "no-first-run" => nil,
  "use-mock-keychain" => nil,
  "keep-alive-for-test" => nil,
  "disable-popup-blocking" => nil,
  "disable-extensions" => nil,
  "disable-hang-monitor" => nil,
  "disable-features" => "site-per-process,TranslateUI",
  "disable-translate" => nil,
  "disable-background-networking" => nil,
  "enable-features" => "NetworkService,NetworkServiceInProcess",
  "disable-background-timer-throttling" => nil,
  "disable-backgrounding-occluded-windows" => nil,
  "disable-client-side-phishing-detection" => nil,
  "disable-default-apps" => nil,
  "disable-dev-shm-usage" => nil,
  "disable-ipc-flooding-protection" => nil,
  "disable-prompt-on-repost" => nil,
  "disable-renderer-backgrounding" => nil,
  "force-color-profile" => "srgb",
  "metrics-recording-only" => nil,
  "safebrowsing-disable-auto-update" => nil,
  "password-store" => "basic",
  # Note: --no-sandbox is not needed if you properly setup a user in the container.
  # https://github.com/ebidel/lighthouse-ci/blob/master/builder/Dockerfile#L35-L40
  # "no-sandbox" => nil,
}.freeze
NOT_FOUND = 
"Could not find an executable for chrome. Try to make it " \
"available on the PATH or set environment varible for " \
"example BROWSER_PATH=\"/Applications/Chromium.app/Contents/MacOS/Chromium\""

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Process

Returns a new instance of Process.



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# File 'lib/ferrum/browser/process.rb', line 100

def initialize(options)
  @options = {}

  @path = options[:browser_path] || BROWSER_PATH || self.class.detect_browser_path

  if options[:url]
    url = URI.join(options[:url].to_s, "/json/version")
    response = JSON.parse(::Net::HTTP.get(url))
    set_ws_url(response["webSocketDebuggerUrl"])
    return
  end

  # Doesn't work on MacOS, so we need to set it by CDP as well
  @options.merge!("window-size" => options[:window_size].join(","))

  port = options.fetch(:port, BROWSER_PORT)
  @options.merge!("remote-debugging-port" => port)

  host = options.fetch(:host, BROWSER_HOST)
  @options.merge!("remote-debugging-address" => host)

  @options.merge!("user-data-dir" => Dir.mktmpdir)

  @options = DEFAULT_OPTIONS.merge(@options)

  unless options.fetch(:headless, true)
    @options.delete("headless")
    @options.delete("disable-gpu")
  end

  @process_timeout = options.fetch(:process_timeout, PROCESS_TIMEOUT)

  @options.merge!(options.fetch(:browser_options, {}))

  @logger = options[:logger]
end

Instance Attribute Details

#cmd ⇒ Object (readonly)

Returns the value of attribute cmd.



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# File 'lib/ferrum/browser/process.rb', line 59

def cmd
  @cmd
end

#host ⇒ Object (readonly)

Returns the value of attribute host.



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# File 'lib/ferrum/browser/process.rb', line 59

def host
  @host
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/ferrum/browser/process.rb', line 59

def options
  @options
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/ferrum/browser/process.rb', line 59

def path
  @path
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/ferrum/browser/process.rb', line 59

def pid
  @pid
end

#port ⇒ Object (readonly)

Returns the value of attribute port.



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# File 'lib/ferrum/browser/process.rb', line 59

def port
  @port
end

#ws_url ⇒ Object (readonly)

Returns the value of attribute ws_url.



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# File 'lib/ferrum/browser/process.rb', line 59

def ws_url
  @ws_url
end

Class Method Details

.detect_browser_path ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 86

def self.detect_browser_path
  if RUBY_PLATFORM.include?("darwin")
    [
      "/Applications/Chromium.app/Contents/MacOS/Chromium",
      "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
    ].find { |path| File.exist?(path) }
  else
    %w[chromium google-chrome-unstable google-chrome-beta google-chrome chrome chromium-browser google-chrome-stable].reduce(nil) do |path, exe|
      path = Cliver.detect(exe)
      break path if path
    end
  end
end

.process_killer(pid) ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 65

def self.process_killer(pid)
  proc do
    begin
      if Ferrum.windows?
        ::Process.kill("KILL", pid)
      else
        ::Process.kill("USR1", pid)
        start = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC)
        while ::Process.wait(pid, ::Process::WNOHANG).nil?
          sleep 0.05
          next unless (::Process.clock_gettime(::Process::CLOCK_MONOTONIC) - start) > KILL_TIMEOUT
          ::Process.kill("KILL", pid)
          ::Process.wait(pid)
          break
        end
      end
    rescue Errno::ESRCH, Errno::ECHILD
    end
  end
end

.start(*args) ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 61

def self.start(*args)
  new(*args).tap(&:start)
end

Instance Method Details

#restart ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 169

def restart
  stop
  start
end

#start ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 137

def start
  # Don't do anything as browser is already running as external process.
  return if ws_url

  begin
    read_io, write_io = IO.pipe
    process_options = { in: File::NULL }
    process_options[:pgroup] = true unless Ferrum.windows?
    if Ferrum.mri?
      process_options[:out] = process_options[:err] = write_io
    end

    raise Cliver::Dependency::NotFound.new(NOT_FOUND) unless @path

    redirect_stdout(write_io) do
      @cmd = [@path] + @options.map { |k, v| v.nil? ? "--#{k}" : "--#{k}=#{v}" }
      @pid = ::Process.spawn(*@cmd, process_options)
      ObjectSpace.define_finalizer(self, self.class.process_killer(@pid))
    end

    parse_ws_url(read_io, @process_timeout)
  ensure
    close_io(read_io, write_io)
  end
end

#stop ⇒ Object 



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# File 'lib/ferrum/browser/process.rb', line 163

def stop
  return unless @pid
  kill
  ObjectSpace.undefine_finalizer(self)
end