Refactor RFC2455 TRex traffic profile injection

The TRex RFC2455 traffic profile configures the duration of the traffic
injection. Once the traffic is started, the traffic profile should poll
the traffic injector client for the injection status. When the injection
is finished, the traffic execution should end.

Instead of this, the traffic profile waits a fixed time (using time.sleep
method) and then stops the traffic. This approach is not accurate and may
cause shorter injection periods.

JIRA: YARDSTICK-1197

Change-Id: I5090df81ef4ec7945ff6c1aff070656b48e0fe77
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>
(cherry picked from commit 340be73be5fd20067c23a7ddce9073639e355d3a)

1 files changed, 24 insertions, 2 deletions

diff --git a/yardstick/common/utils.py b/yardstick/common/utils.py
index 869db469b..f9fe0e336 100644
--- a/yardstick/common/utils.py
+++ b/yardstick/common/utils.py
@@ -422,13 +422,18 @@ class ErrorClass(object):
 
 
 class Timer(object):
-    def __init__(self, timeout=None):
+    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):
-        raise exceptions.TimerTimeout(timeout=self._timeout)
+        self._timeout_flag = True
+        if self._raise_exception:
+            raise exceptions.TimerTimeout(timeout=self._timeout)
+        self.__exit__()
 
     def __enter__(self):
         self.start = datetime.datetime.now()
@@ -445,6 +450,23 @@ class Timer(object):
     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"""