Class: Zold::Farmers::Spawn

Inherits:
Object
  • Object
show all
Defined in:
lib/zold/node/farmers.rb

Overview

In a child process

Instance Method Summary collapse

Constructor Details

#initialize(log: Log::NULL) ⇒ Spawn

Returns a new instance of Spawn.



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# File 'lib/zold/node/farmers.rb', line 83

def initialize(log: Log::NULL)
  @log = log
end

Instance Method Details

#up(score) ⇒ Object 



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# File 'lib/zold/node/farmers.rb', line 87

def up(score)
  start = Time.now
  bin = File.expand_path(File.join(File.dirname(__FILE__), '../../../bin/zold'))
  raise "Zold binary not found at #{bin}" unless File.exist?(bin)
  cmd = [
    'ruby',
    Shellwords.escape(bin),
    '--skip-upgrades',
    "--info-tid=#{Thread.current.thread_variable_get(:tid)}",
    "--info-thread=#{Shellwords.escape(Thread.current.name)}",
    "--info-start=#{Time.now.utc.iso8601}",
    '--low-priority',
    'next',
    Shellwords.escape(score)
  ].join(' ')
  Open3.popen2e(cmd) do |stdin, stdout, thr|
    Thread.current.thread_variable_set(:pid, thr.pid.to_s)
    at_exit { Farmers.kill(@log, thr.pid, start) }
    @log.debug("Scoring started in proc ##{thr.pid} \
for #{score.value}/#{score.strength} at #{score.host}:#{score.port}")
    begin
      stdin.close
      buffer = +''
      loop do
        begin
          buffer << stdout.read_nonblock(16 * 1024)
          # rubocop:disable Lint/HandleExceptions
        rescue IO::WaitReadable => _
          # rubocop:enable Lint/HandleExceptions
          # nothing to do here
        rescue StandardError => e
          @log.error(buffer)
          raise e
        end
        break if buffer.end_with?("\n") && thr.value.to_i.zero?
        if stdout.closed?
          raise "Failed to calculate the score (##{thr.value}): #{buffer}" unless thr.value.to_i.zero?
          break
        end
        sleep(1)
        Thread.current.thread_variable_set(:buffer, buffer.length.to_s)
      end
      after = Score.parse(buffer.strip)
      @log.debug("Next score #{after.value}/#{after.strength} found in proc ##{thr.pid} \
for #{after.host}:#{after.port} in #{Age.new(start)}: #{after.suffixes}")
      after
    ensure
      Farmers.kill(@log, thr.pid, start)
    end
  end
end