Class: Evilution::Isolation::Fork

Inherits:
Object
  • Object
show all
Defined in:
lib/evilution/isolation/fork.rb

Constant Summary collapse

GRACE_PERIOD = 
2

Instance Method Summary collapse

Constructor Details

#initialize(hooks: nil) ⇒ Fork

Returns a new instance of Fork.



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# File 'lib/evilution/isolation/fork.rb', line 13

def initialize(hooks: nil)
  @hooks = hooks
end

Instance Method Details

#call(mutation:, test_command:, timeout:) ⇒ Object 



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# File 'lib/evilution/isolation/fork.rb', line 17

def call(mutation:, test_command:, timeout:)
  pid = nil
  sandbox_dir = Dir.mktmpdir("evilution-run")
  start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
  parent_rss = Evilution::Memory.rss_kb
  read_io, write_io = IO.pipe
  # Marshal result payload is ASCII-8BIT; pipes default to text mode and may
  # transcode according to their external/internal encodings (influenced by
  # Encoding.default_external and/or Encoding.default_internal — Rails sets
  # the latter to UTF-8), failing on bytes with no mapping. Force binmode on
  # both ends.
  read_io.binmode
  write_io.binmode

  pid = ::Process.fork do
    ENV["TMPDIR"] = sandbox_dir
    read_io.close
    suppress_child_output
    @hooks.fire(:worker_process_start, mutation: mutation) if @hooks
    result = execute_in_child(mutation, test_command)
    Marshal.dump(result, write_io)
    write_io.close
    exit!(result[:passed] ? 0 : 1)
  end

  write_io.close
  result = wait_for_result(pid, read_io, timeout)
  duration = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start_time

  build_mutation_result(mutation, result, duration, parent_rss)
ensure
  read_io&.close
  write_io&.close
  ensure_reaped(pid)
  restore_original_source(mutation)
  FileUtils.rm_rf(sandbox_dir) if sandbox_dir
end