Class: InteractiveServer

Inherits:
Object
  • Object
show all
Defined in:
app/drivers/chrome/pipe.rb

Overview

Interactive pipe for testing. Creates a server that routes $stdin into if_dispatch and $stdout to int_dispatch.

Instance Method Summary collapse

Constructor Details

#initialize(app_js_path) ⇒ InteractiveServer

Returns a new instance of InteractiveServer.



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# File 'app/drivers/chrome/pipe.rb', line 11

def initialize app_js_path
  @app_js = File.read app_js_path
  inject_dispatch_shims
end

Instance Method Details

#begin_pipe ⇒ Object

Will take over any remaining IO



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# File 'app/drivers/chrome/pipe.rb', line 17

def begin_pipe
  tmp = Tempfile.new(SecureRandom.hex)
  path = tmp.path
  tmp.close!
  File.write path, @app_js

  p = Open3.popen3 "boojs #{path}" do |inp, out, err, t|
    pid = t[:pid]
    begin
      loop do
        results = select([out, err, STDIN], [])
        if results[0].include? err
          err_msg = err.readline
          $stderr.puts err_msg
          #exit 1 unless err_msg =~ /[debug]/
        end

        if results[0].include? STDIN
          begin
            q = gets.strip
            if q == "RESTART"
              inp.puts "$__RESTART__"

              begin
                #Wait for restart to respond 'ok'
                Timeout::timeout(10) do
                  restart_res = out.readline
                  raise "Restart of phantomjs did not return '__RESTART_OK__' like expected, returned: #{restart_res.inspect}" unless restart_res == "$__RESTART_OK__\n"
                end
              rescue Timeout::Error
                raise "Restart of boojs did not happen within 5 seconds"
              rescue EOFError
                #Sleep for a second to let the error pipe fill up from boojs, this error
                #will then be displayed and then we will crash
                sleep 3
                $stderr.puts err.read
                raise "boojs encountered an error"
              end

              puts "RESTART OK"
            else
              inp.puts "if_dispatch(JSON.parse('#{q}'))"
            end
          rescue Errno::EIO
            #Can't say anything here, we don't have a pipe
            exit 1
          rescue NoMethodError
            exit 1
          end
        end

        if results[0].include? out
          res = out.readline
          $stdout.puts res
          $stdout.flush
        end
      end
    ensure
      begin
        Process.kill :INT, pid
      rescue Errno::ESRCH
      end
    end
  end
end

#inject_dispatch_shims ⇒ Object

JS Functions##################################################### Make calls to if_dispatch go to $stdout, make $stdin call int_dispatch



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# File 'app/drivers/chrome/pipe.rb', line 85

def inject_dispatch_shims
  @app_js << %{
    function int_dispatch(q) {
      system.stdout.writeLine(JSON.stringify(q));
    }
  }
end