wrapper.py 2.99 KB
# -*- coding: utf-8 -*-
# vim: set et sts=2:
##############################################################################
#
# Copyright (c) 2018 Vifib SARL and Contributors.
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# This program is Free Software; you can redistribute it and/or
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import subprocess
import functools
import signal
import traceback
from zope.interface import implementer
from slapos.grid.promise import interface
from slapos.grid.promise.generic import GenericPromise

@implementer(interface.IPromise)
class WrapPromise(GenericPromise):
  """
    A wrapper promise used to run old promises style and bash promises
  """

  def __init__(self, config):
    GenericPromise.__init__(self, config)
    self.setPeriodicity(minute=2)

  @staticmethod
  def terminate(name, logger, process, signum, frame):
    if signum in [signal.SIGINT, signal.SIGTERM] and process.poll() is None:
      logger.info("Terminating promise process %r" % name)
      try:
        # make sure we kill the process on timeout
        process.terminate()
      except Exception:
        logger.error(traceback.format_exc())

  def sense(self):
    promise_process = subprocess.Popen(
        [self.getPromiseFile()],
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        cwd=self.getPartitionFolder(),
        universal_newlines=True,
    )
    handler = functools.partial(self.terminate, self.getName(), self.logger,
                                promise_process)
    signal.signal(signal.SIGINT, handler)
    signal.signal(signal.SIGTERM, handler)

    message = promise_process.communicate()[0].strip()
    if promise_process.returncode:
      self.logger.error(message)
    else:
      self.logger.info(message)

  def test(self):
    # Fail if the latest promise result failed
    return self._test(result_count=1, failure_amount=1)

  def anomaly(self):
    # Fail if 3 latest promise result failed, no bang
    return self._test(result_count=3, failure_amount=3)