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

Returns a new instance of 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

Returns:

  • (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

Returns:

  • (Boolean) 


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

def failed?
	state == :failed
end

#jammed? ⇒ Boolean

Returns:

  • (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

Returns:

  • (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

Returns:

  • (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

Returns:

  • (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