Class: PrettyMultitask::RunCallable

Inherits:
Object
  • Object
show all
Defined in:
lib/pretty_multitask/run_callable.rb

Overview

This class will run a callable, and wrap it’s output adding nice format

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ RunCallable

Returns a new instance of RunCallable.



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# File 'lib/pretty_multitask/run_callable.rb', line 6

def initialize(opts = {})
  @opts = opts
end

Instance Method Details

#close_streams(streams) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 69

def close_streams(streams)
  streams.each(&:close)
end

#consume_and_print(reader, writer, name, error = false) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 93

def consume_and_print(reader, writer, name, error = false)
  Thread.new do
    begin
      fmt = "%#{@padding}s |"
      colored = Color.red format(fmt, name) if error
      colored = Color.green format(fmt, name) unless error
      reader.each_line do |line|
        writer.write "#{colored} #{line}"
        next unless @opts[:out_file]

        File.open(@opts[:out_file], 'a+') do |f|
          f.puts "#{colored} #{line}" if error
          f.puts "#{colored} #{line}" unless error
        end
      end
    rescue Errno::EIO
      nil
    rescue IOError
      nil
    end
  end
end

#consume_and_store(reader, store) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 43

def consume_and_store(reader, store)
  t = Thread.new do
    sleep 0.1 until reader.ready?
    3.times do
      store << reader.getc while reader.ready?
    end
  end
  t
end

#join_threads(threads) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 59

def join_threads(threads)
  threads.each do |t|
    begin
      Timeout.timeout(0.1) { t.join }
    rescue Timeout::Error
      nil
    end
  end
end

#run(opts = @opts) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 10

def run(opts = @opts)
  cmd = opts[:cmd]
  name = opts[:name]
  out = STDOUT
  @padding = opts[:padding]
  master, slave = PTY.open
  err_read, err_write = IO.pipe

  r, w = UNIXSocket.pair(:STREAM, 0)

  pid = run_on_fork(cmd, err_write, master, w)
  Trapper.trap pid

  t_out = consume_and_print slave, out, name, false
  t_err = consume_and_print err_read, out, name, true

  chars = []
  t = consume_and_store r, chars

  Process.wait pid

  wait_until_streams_are_ready [slave, err_read]

  join_threads [t_out, t_err, t]

  close_streams [master, slave, err_read, err_write]

  result = Marshal.load(chars.join)
  raise result[:error] if result[:error]

  result[:result]
end

#run_on_fork(cmd, err_w, out_w, socket_w) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 73

def run_on_fork(cmd, err_w, out_w, socket_w)
  pid = fork do
    STDERR.reopen err_w
    STDOUT.reopen out_w
    begin
      result = cmd.call
      obj = { result: result, error: nil }
    rescue StandardError => e
      new_error = e.class.new(e.message)
      new_error.set_backtrace e.backtrace
      Logger.new(STDERR).error new_error
      obj = { result: nil, error: new_error }
      socket_w.puts Marshal.dump(obj), 0
    end
    socket_w.puts Marshal.dump(obj), 0
    socket_w.close
  end
  pid
end

#wait_until_streams_are_ready(streams) ⇒ Object 



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# File 'lib/pretty_multitask/run_callable.rb', line 53

def wait_until_streams_are_ready(streams)
  streams.each do |s|
    loop { break unless s.ready? }
  end
end