X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=yardstick%2Fcommon%2Futils.py;h=251e5cc6c4ec28a93fc601bea70ed8565ec91df5;hb=bbced563ad9ceca5021c65a2e6284861d36db4f8;hp=44cc92a7c1168f53e75907a0fd65ebb04142c9f5;hpb=5ac59e495d74b64ab377f1ba25bb00b11da14e67;p=yardstick.git

diff --git a/yardstick/common/utils.py b/yardstick/common/utils.py
index 44cc92a7c..251e5cc6c 100644
--- a/yardstick/common/utils.py
+++ b/yardstick/common/utils.py
@@ -23,9 +23,11 @@ import logging
 import os
 import random
 import re
+import signal
 import socket
 import subprocess
 import sys
+import time
 
 import six
 from flask import jsonify
@@ -34,6 +36,9 @@ from oslo_serialization import jsonutils
 from oslo_utils import encodeutils
 
 import yardstick
+from yardstick.common import exceptions
+from yardstick.common.yaml_loader import yaml_load
+
 
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.DEBUG)
@@ -302,6 +307,19 @@ def get_ip_version(ip_addr):
         return address.version
 
 
+def make_ip_addr(ip, mask):
+    """
+    :param ip[str]: ip adddress
+    :param mask[str]: /24 prefix of 255.255.255.0 netmask
+    :return: IPv4Interface object
+    """
+    try:
+        return ipaddress.ip_interface(six.text_type('/'.join([ip, mask])))
+    except (TypeError, ValueError):
+        # None so we can skip later
+        return None
+
+
 def ip_to_hex(ip_addr, separator=''):
     try:
         address = ipaddress.ip_address(six.text_type(ip_addr))
@@ -405,20 +423,51 @@ class ErrorClass(object):
 
 
 class Timer(object):
-    def __init__(self):
+    def __init__(self, timeout=None, raise_exception=True):
         super(Timer, self).__init__()
         self.start = self.delta = None
+        self._timeout = int(timeout) if timeout else None
+        self._timeout_flag = False
+        self._raise_exception = raise_exception
+
+    def _timeout_handler(self, *args):
+        self._timeout_flag = True
+        if self._raise_exception:
+            raise exceptions.TimerTimeout(timeout=self._timeout)
+        self.__exit__()
 
     def __enter__(self):
         self.start = datetime.datetime.now()
+        if self._timeout:
+            signal.signal(signal.SIGALRM, self._timeout_handler)
+            signal.alarm(self._timeout)
         return self
 
     def __exit__(self, *_):
+        if self._timeout:
+            signal.alarm(0)
         self.delta = datetime.datetime.now() - self.start
 
     def __getattr__(self, item):
         return getattr(self.delta, item)
 
+    def __iter__(self):
+        self._raise_exception = False
+        return self.__enter__()
+
+    def next(self):  # pragma: no cover
+        # NOTE(ralonsoh): Python 2 support.
+        if not self._timeout_flag:
+            return datetime.datetime.now()
+        raise StopIteration()
+
+    def __next__(self):  # pragma: no cover
+        # NOTE(ralonsoh): Python 3 support.
+        return self.next()
+
+    def __del__(self):  # pragma: no cover
+        signal.alarm(0)
+
 
 def read_meminfo(ssh_client):
     """Read "/proc/meminfo" file and parse all keys and values"""
@@ -460,3 +509,30 @@ def open_relative_file(path, task_path):
         if e.errno == errno.ENOENT:
             return open(os.path.join(task_path, path))
         raise
+
+
+def wait_until_true(predicate, timeout=60, sleep=1, exception=None):
+    """Wait until callable predicate is evaluated as True
+
+    :param predicate: (func) callable deciding whether waiting should continue
+    :param timeout: (int) timeout in seconds how long should function wait
+    :param sleep: (int) polling interval for results in seconds
+    :param exception: exception instance to raise on timeout. If None is passed
+                      (default) then WaitTimeout exception is raised.
+    """
+    try:
+        with Timer(timeout=timeout):
+            while not predicate():
+                time.sleep(sleep)
+    except exceptions.TimerTimeout:
+        if exception and issubclass(exception, Exception):
+            raise exception  # pylint: disable=raising-bad-type
+        raise exceptions.WaitTimeout
+
+
+def read_yaml_file(path):
+    """Read yaml file"""
+
+    with open(path) as stream:
+        data = yaml_load(stream)
+    return data