Class: Pytty::Daemon::ProcessYield

Inherits:
Object
  • Object
show all
Defined in:
lib/pytty/daemon/process_yield.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cmd, id: nil, env: {}) ⇒ ProcessYield

Returns a new instance of ProcessYield.



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# File 'lib/pytty/daemon/process_yield.rb', line 9

def initialize(cmd, id:nil, env:{})
  @cmd = cmd
  @env = env

  @pid = nil
  @status = nil
  @id = id || SecureRandom.uuid

  @stdouts = {}
  @stderrs = {}

  @stdout_path = File.join Pytty::Daemon.pytty_path, "#{@id}.stdout"
  @stderr_path = File.join Pytty::Daemon.pytty_path, "#{@id}.stderr"

  @stdin = Async::Queue.new
end

Instance Attribute Details

#cmd ⇒ Object (readonly)

Returns the value of attribute cmd.



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# File 'lib/pytty/daemon/process_yield.rb', line 26

def cmd
  @cmd
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/pytty/daemon/process_yield.rb', line 26

def id
  @id
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/pytty/daemon/process_yield.rb', line 26

def pid
  @pid
end

#status ⇒ Object (readonly)

Returns the value of attribute status.



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# File 'lib/pytty/daemon/process_yield.rb', line 26

def status
  @status
end

#stderr_path ⇒ Object (readonly)

Returns the value of attribute stderr_path.



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# File 'lib/pytty/daemon/process_yield.rb', line 27

def stderr_path
  @stderr_path
end

#stdin ⇒ Object

Returns the value of attribute stdin.



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# File 'lib/pytty/daemon/process_yield.rb', line 28

def stdin
  @stdin
end

#stdout_path ⇒ Object (readonly)

Returns the value of attribute stdout_path.



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# File 'lib/pytty/daemon/process_yield.rb', line 27

def stdout_path
  @stdout_path
end

Instance Method Details

#add_stderr(stderr) ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 35

def add_stderr(stderr)
  notification = Async::Notification.new
  @stderrs[notification] = stderr
  notification
end

#add_stdout(stdout) ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 30

def add_stdout(stdout)
  notification = Async::Notification.new
  @stdouts[notification] = stdout
  notification
end

#cleanup ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 57

def cleanup
  @status = nil

  File.unlink @stdout_path if File.exist? @stdout_path
  File.unlink @stderr_path if File.exist? @stderr_path
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pytty/daemon/process_yield.rb', line 41

def running?
  # test by killing?
  !@pid.nil?
end

#signal(sig) ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 217

def signal(sig)
  return unless @pid
  Process.kill(sig.upcase, @pid)
rescue Errno::ESRCH => ex
  raise ex unless ex.message == "No such process"
end

#spawn(tty: false, interactive: false) ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 64

def spawn(tty: false, interactive: false)
  return false if running?
  cleanup

  stdout_appender = Async::IO::Stream.new(
    File.open @stdout_path, "a"
  )
  stderr_appender = Async::IO::Stream.new(
    File.open @stderr_path, "a"
  )

  executable, *args = @cmd
  # @env.merge!({
  #   "TERM" => "xterm"
  # })

  Async::Task.current.async do |task|
    real_stdout, real_stdin, real_stderr, @pid, wait_thr  = begin
      if tty
        stderr_reader, stderr_writer = IO.pipe
        p ["spawn", "PTY"]
        #TODO: if bash is started, no prompt is written in stderr or stdout
        p_stdout, p_stdin, pid = PTY.spawn @env, executable, *args, err: stderr_writer

        [p_stdout, p_stdin, stderr_reader, pid]
      else
        p_stdin, p_stdout, p_stderr, p_wait_thr = Open3.popen3 @env, executable, *args, {}
        [p_stdout, p_stdin, p_stderr, p_wait_thr.pid, p_wait_thr]
      end
    rescue Errno::ENOENT => ex
      raise unless ex.message == "No such file or directory - #{executable}"
    end

    next unless @pid  #command failed to spawn

    async_stdout = Async::IO::Generic.new real_stdout
    async_stdin = Async::IO::Generic.new real_stdin
    async_stderr = Async::IO::Generic.new real_stderr

    task_stdin_writer = if interactive
      task.async do |subtask|
        p ["task_stdin_writer", "started"]
        while c = @stdin.dequeue do
          async_stdin.write c
        end
      rescue Async::Stop => ex
        puts "async_stdin#write Async::Stop"
      rescue Exception => ex
        puts "async_stdin#write: #{ex.inspect}"
      ensure
        async_stdin.close
        p ["async_stdin", "closed"]
      end
    else
      nil
    end

    task_stderr_writer = task.async do
      p ["task_stderr_writer", "started"]
      while c = async_stderr.read(1) do
        stderr_appender.write c
        stderr_appender.flush

        @stderrs.each do |notification, stderr|
          begin
            stderr.write "2#{c}"
          rescue Async::HTTP::Body::Writable::Closed
            puts "signaling error"
            notification.signal
            @stderrs.delete notification
          rescue => ex
            raise ex
          end
        end
      end
      p ["task_stderr_writer", "async_stderr has no more read"]
    rescue Exception => ex
      p ["async_stderr ex:", ex]
    ensure
      stderr_appender.flush
      stderr_appender.close
      puts "stderr_appender closed"
      async_stderr.close
      puts "async_stderr closed"
    end

    task_stdout_writer = task.async do
      p ["task_stdout_writer", "started"]

      while c = async_stdout.read(1)
        stdout_appender.write c
        stdout_appender.flush

        @stdouts.each do |notification, stdout|
          begin
            stdout.write "1#{c}"
          rescue Errno::EPIPE, Errno::EPROTOTYPE => ex
            notification.signal
            @stdouts.delete notification
          end
        end
      end
      p ["task_stdout_writer", "stopped"]
    rescue Async::Stop
      signal "kill"
    rescue Exception => ex
      p ["async_stdout", ex]
    ensure
      process_status = if wait_thr
        wait_thr.value
      else
        begin
          Process.wait(@pid)
          $?
        rescue Errno::ECHILD => ex
          raise ex unless ex.message == "No child processes"
          puts "NO CHILD PROCESS"
          nil
        end
      end

      @status = if process_status && process_status.exitstatus
        process_status.exitstatus
      else
        Signal.signame process_status.termsig
      end

      puts "exited #{@id} with status: #{@status}"
      @pid = nil
      task_stdin_writer.stop if task_stdin_writer

      @stdouts.each do |notification, stdout|
        notification.signal
        @stdouts.delete notification
      end
      @stderrs.each do |notification, stderr|
        notification.signal
        @stdouts.delete notification
      end
      Pytty::Daemon.dump
    end
  end

  if @pid
    p ["spawned", id]
    return true
  else
    p ["failed to spawn"]
    @status = 127
    return false
  end
end

#to_json(json_generator_state = nil) ⇒ Object 



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# File 'lib/pytty/daemon/process_yield.rb', line 46

def to_json(json_generator_state=nil)
  {
    id: @id,
    pid: @pid,
    status: @status,
    cmd: @cmd,
    env: @env,
    running: running?
  }.to_json
end