Class: RSpecBackgroundProcess::BackgroundProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/rspec-background-process/server.rb,
lib/rspec-background-process/background_process.rb

Direct Known Subclasses

LoadedBackgroundProcess

Defined Under Namespace

Modules: Server Classes: ProcessExitedError, ProcessReadyFailedError, ProcessReadyTimeOutError, ProcessRunAwayError, StateError

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, cmd, args = [], working_directory = nil, options = {}) ⇒ BackgroundProcess 



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# File 'lib/rspec-background-process/background_process.rb', line 41

def initialize(name, cmd, args = [], working_directory = nil, options = {})
  @name = name

  @exec = (Pathname.new(Dir.pwd) + cmd).cleanpath.to_s
  @args = args.map(&:to_s)

  @pid = nil
  @process = nil

  @state_log = []

  case working_directory
  when Array
    working_directory = Dir.mktmpdir(working_directory)
  when nil
    working_directory = Dir.mktmpdir(name.to_s)
  end

  @working_directory = Pathname.new(working_directory.to_s)
  @working_directory.directory? or @working_directory.mkdir

  @pid_file = @working_directory + "#{@name}.pid"
  @log_file = @working_directory + "out.log"

  @options = options
  reset_options(options)

  @fsm_lock = Mutex.new

  @_fsm = MicroMachine.new(:not_running)

  @state_change_time = Time.now.to_f
  @after_state_change = []

  @_fsm.on(:any) do
    @state_change_time = Time.now.to_f
    puts "process is now #{@_fsm.state}"
    @after_state_change.each{|callback| callback.call(@_fsm.state)}
  end

  @_fsm.when(:starting,
    not_running: :starting
  )

  @_fsm.on(:starting) do
    puts "starting: `#{command}`"
    puts "working directory: #{@working_directory}"
    puts "log file: #{@log_file}"
  end

  @_fsm.when(:started,
    starting: :running
  )
  @_fsm.on(:running) do
    puts "running with pid: #{@pid}"
  end

  @_fsm.when(:stopped,
    running: :not_running,
    ready: :not_running
  )

  @_fsm.when(:died,
    starting: :dead,
    running: :dead,
    ready: :dead
  )

  # it is topped before marked failed
  @_fsm.when(:failed,
    not_running: :failed
  )

  @_fsm.when(:verified,
    running: :ready,
    ready: :ready,
  )
  @_fsm.when(:run_away,
    running: :jammed,
    ready: :jammed
  )

  @template_renderer = options[:template_renderer]

  # make sure we stop on exit
  my_pid = Process.pid
  at_exit do
    stop if Process.pid == my_pid and running? #only run in master process
  end
end

Instance Attribute Details

#kill_timeout ⇒ Object (readonly)

Returns the value of attribute kill_timeout.



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# File 'lib/rspec-background-process/background_process.rb', line 160

def kill_timeout
  @kill_timeout
end

#log_file ⇒ Object (readonly)

Returns the value of attribute log_file.



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# File 'lib/rspec-background-process/background_process.rb', line 157

def log_file
  @log_file
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/rspec-background-process/background_process.rb', line 154

def name
  @name
end

#pid_file ⇒ Object (readonly)

Returns the value of attribute pid_file.



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# File 'lib/rspec-background-process/background_process.rb', line 156

def pid_file
  @pid_file
end

#ready_timeout ⇒ Object (readonly)

Returns the value of attribute ready_timeout.



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# File 'lib/rspec-background-process/background_process.rb', line 158

def ready_timeout
  @ready_timeout
end

#state_change_time ⇒ Object (readonly)

Returns the value of attribute state_change_time.



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# File 'lib/rspec-background-process/background_process.rb', line 161

def state_change_time
  @state_change_time
end

#state_log ⇒ Object (readonly)

Returns the value of attribute state_log.



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# File 'lib/rspec-background-process/background_process.rb', line 162

def state_log
  @state_log
end

#term_timeout ⇒ Object (readonly)

Returns the value of attribute term_timeout.



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# File 'lib/rspec-background-process/background_process.rb', line 159

def term_timeout
  @term_timeout
end

#working_directory ⇒ Object (readonly)

Returns the value of attribute working_directory.



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# File 'lib/rspec-background-process/background_process.rb', line 155

def working_directory
  @working_directory
end

Instance Method Details

#after_state_change(&callback) ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 318

def after_state_change(&callback)
  @after_state_change << callback
end

#command ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 149

def command
  # update arguments with actual port numbers, working directories etc. (see template variables)
  Shellwords.join([@exec, *@args.map{|arg| render(arg)}])
end

#dead? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 195

def dead?
  state == :dead
end

#exit_code ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 179

def exit_code
  @process.value.exitstatus if not running? and @process
end

#failed? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 199

def failed?
  state == :failed
end

#jammed? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 203

def jammed?
  state == :jammed
end

#pid ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 175

def pid
  @pid if starting? or running?
end

#puts(message) ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 322

def puts(message)
  message = "#{name}: #{message}"
  @state_log << message
  super message if @logging
end

#ready? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 191

def ready?
  state == :ready
end

#refresh ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 211

def refresh
  puts 'refreshing'
  cwd = Dir.pwd
  begin
    Dir.chdir(@working_directory.to_s)
    @refresh_action.call(self)
  ensure
    Dir.chdir(cwd)
  end
  self
end

#render(str) ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 132

def render(str)
  if @template_renderer
    @template_renderer.call(template_variables, str)
  else
    str
  end
end

#reset_options(opts) ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 164

def reset_options(opts)
  @logging = opts[:logging]

  @ready_timeout = opts[:ready_timeout] || 10
  @term_timeout = opts[:term_timeout] || 10
  @kill_timeout = opts[:kill_timeout] || 10

  @ready_test = opts[:ready_test] || ->(_){true}
  @refresh_action = opts[:refresh_action] || ->(_){restart}
end

#restart ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 223

def restart
  puts 'restarting'
  stop
  start
end

#running? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 183

def running?
  trigger? :stopped # if it can be stopped it must be running :D
end

#start ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 229

def start
  return self if trigger? :stopped
  trigger? :starting or raise StateError.new(self, 'start', state)

  trigger :starting
  @pid, @process = spawn

  fail "expected 2 values from #spawn, got: #{@pid}, #{@process}" unless @pid and @process

  @process_watcher = Thread.new do
    @process.join
    trigger :died
  end

  trigger :started
  self
end

#starting? ⇒ Boolean 



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# File 'lib/rspec-background-process/background_process.rb', line 187

def starting?
  state == :starting
end

#state ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 207

def state
  lock_fsm{|fsm| fsm.state }
end

#stop ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 247

def stop
  return if trigger? :started
  trigger? :stopped or raise StateError.new(self, 'stop', state)

  # get rid of the watcher thread
  @process_watcher and @process_watcher.kill and @process_watcher.join

  catch :done do
    begin
      if @term_timeout > 0
        puts "terminating process: #{@pid}"
        Process.kill("TERM", @pid)
        @process.join(@term_timeout) and throw :done
        puts "process #{@pid} did not terminate in time"
      end

      if @kill_timeout > 0
        puts "killing process: #{@pid}"
        Process.kill("KILL", @pid)
        @process.join(@kill_timeout) and throw :done
        puts "process #{@pid} could not be killed!!!"
      end
    rescue Errno::ESRCH
      throw :done
    end

    trigger :run_away
    raise ProcessRunAwayError.new(self, @pid)
  end

  trigger :stopped
  self
end

#template_variables ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 140

def template_variables
  {
    /working directory/ => -> { working_directory },
    /pid file/ => -> { pid_file },
    /log file/ => -> { log_file },
    /name/ => -> { name },
  }
end

#to_s ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 328

def to_s
  "#{name}[#{@exec}](#{state})"
end

#wait_ready ⇒ Object 



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# File 'lib/rspec-background-process/background_process.rb', line 281

def wait_ready
  trigger? :verified or raise StateError.new(self, 'wait ready', state)

  puts 'waiting ready'

  status = while_running do
    begin
      Timeout.timeout(@ready_timeout) do
        @ready_test.call(self) ? :ready : :failed
      end
    rescue Timeout::Error
      :ready_timeout
    end
  end

  case status
  when :failed
    puts "process failed to pass it's readiness test"
    stop
    trigger :failed
    raise ProcessReadyFailedError.new(self)
  when :ready_timeout
    puts "process not ready in time; see #{log_file} for detail"
    stop
    trigger :failed
    raise ProcessReadyTimeOutError.new(self)
  when Exception
    puts "process readiness check raised error: #{status}; see #{log_file} for detail"
    stop
    trigger :failed
    raise status
  else
    trigger :verified
    self
  end
end