Class: Graphomaton::ProcessRunner

Inherits:
Object
  • Object
show all
Defined in:
lib/graphomaton/process_runner.rb

Defined Under Namespace

Classes: Error, OutputLimitError, TimeoutError

Constant Summary collapse

DEFAULT_TIMEOUT = 
30
DEFAULT_MAX_STDOUT_BYTES = 
64 * 1024 * 1024
DEFAULT_MAX_STDERR_BYTES = 
1024 * 1024
READ_SIZE = 
16 * 1024

Class Method Summary collapse

Class Method Details

.capture3(*command, stdin_data: '', binmode: false, timeout: DEFAULT_TIMEOUT, max_stdout_bytes: DEFAULT_MAX_STDOUT_BYTES, max_stderr_bytes: DEFAULT_MAX_STDERR_BYTES) ⇒ Object 



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# File 'lib/graphomaton/process_runner.rb', line 34

def self.capture3(*command, stdin_data: '', binmode: false, timeout: DEFAULT_TIMEOUT,
                  max_stdout_bytes: DEFAULT_MAX_STDOUT_BYTES,
                  max_stderr_bytes: DEFAULT_MAX_STDERR_BYTES)
  validate_limit(timeout, 'timeout')
  validate_limit(max_stdout_bytes, 'max_stdout_bytes')
  validate_limit(max_stderr_bytes, 'max_stderr_bytes')

  spawn_options = Gem.win_platform? ? { new_pgroup: true } : { pgroup: true }
  stdout_data = nil
  stderr_data = nil
  status = nil

  Open3.popen3(*command, **spawn_options) do |stdin, stdout, stderr, wait_thread|
    streams = [stdin, stdout, stderr]
    streams.each(&:binmode) if binmode
    writer = input_writer(stdin, stdin_data)
    stdout_reader = output_reader(stdout, max_stdout_bytes, 'stdout')
    stderr_reader = output_reader(stderr, max_stderr_bytes, 'stderr')
    threads = [writer, stdout_reader, stderr_reader]

    begin
      Timeout.timeout(timeout, TimeoutError, "Process timed out after #{timeout} seconds") do
        writer.value
        stdout_data = stdout_reader.value
        stderr_data = stderr_reader.value
        status = wait_thread.value
      end
    rescue TimeoutError, OutputLimitError
      terminate(wait_thread)
      raise
    ensure
      streams.each { |stream| stream.close unless stream.closed? }
      threads.each do |thread|
        thread.kill if thread.alive?
        thread.join
      end
    end
  end

  [stdout_data, stderr_data, status]
end

.which(command, path: ENV.fetch('PATH', ''), pathext: ENV.fetch('PATHEXT', '')) ⇒ Object 



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# File 'lib/graphomaton/process_runner.rb', line 17

def self.which(command, path: ENV.fetch('PATH', ''), pathext: ENV.fetch('PATHEXT', ''))
  name = command.to_s
  return nil if name.empty? || name.include?("\0")

  explicit = name.include?(File::SEPARATOR) || (File::ALT_SEPARATOR && name.include?(File::ALT_SEPARATOR))
  directories = explicit ? [''] : path.split(File::PATH_SEPARATOR)
  extensions = executable_extensions(name, pathext)
  directories.each do |directory|
    base = explicit ? name : File.join(directory, name)
    extensions.each do |extension|
      candidate = "#{base}#{extension}"
      return File.expand_path(candidate) if File.file?(candidate) && File.executable?(candidate)
    end
  end
  nil
end