hadoop/hadoop-ozone/fault-injection-test/network-tests/src/test/blockade/util.py

#!/usr/bin/python

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import time
import re
import logging
import subprocess

logger = logging.getLogger(__name__)

def wait_until(predicate, timeout, check_frequency=1):
  deadline = time.time() + timeout
  while time.time() < deadline:
    if predicate():
      return
    time.sleep(check_frequency)


def run_cmd(cmd):
    command = cmd
    if isinstance(cmd, list):
      command = ' '.join(cmd)
    logger.info(" RUNNING: %s", command)
    all_output = ""
    my_process = subprocess.Popen(command,  stdout=subprocess.PIPE,
                                  stderr=subprocess.STDOUT, shell=True)
    while my_process.poll() is None:
      op = my_process.stdout.readline()
      if op:
        all_output += op
        logger.info(op)
    other_output = my_process.communicate()
    other_output = other_output[0].strip()
    if other_output != "":
      all_output += other_output
    reg = re.compile(r"(\r\n|\n)$")
    all_output = reg.sub("", all_output, 1)
    return my_process.returncode, all_output