Class: Gemlings::Sandbox::ForkExecutor

Inherits:
Executor
  • Object
show all
Defined in:
lib/gemlings/sandbox.rb

Overview

MRI / TruffleRuby: fork gives full process isolation and safe kill.

Direct Known Subclasses

BoxExecutor

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Executor

inherited

Class Method Details

.available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gemlings/sandbox.rb', line 30

def self.available?
  Process.respond_to?(:fork)
end

Instance Method Details

#call(timeout, &block) ⇒ Object 



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# File 'lib/gemlings/sandbox.rb', line 34

def call(timeout, &block)
  reader, writer = IO.pipe

  pid = Process.fork do
    reader.close
    Marshal.dump(block.call, writer)
  rescue => e
    Marshal.dump({ error: "#{e.class}: #{e.message}" }, writer)
  ensure
    writer.close
    exit!(0)
  end

  writer.close

  deadline = Process.clock_gettime(Process::CLOCK_MONOTONIC) + timeout
  loop do
    _, status = Process.waitpid2(pid, Process::WNOHANG)
    if status
      break
    elsif Process.clock_gettime(Process::CLOCK_MONOTONIC) > deadline
      Process.kill("KILL", pid)
      Process.waitpid(pid)
      reader.close
      return { error: "Execution timed out after #{timeout}s" }
    end
    sleep 0.05
  end

  data = reader.read
  reader.close

  data.empty? ? { output: "", result: nil, is_final_answer: false } : Marshal.load(data) # rubocop:disable Security/MarshalLoad
end