Convert IXIA latency statistics to integer

JIRA: YARDSTICK-1385

Change-Id: Id50c393da7ded4b3c8e127f7d7a6501832a68446
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

4 files changed, 45 insertions, 3 deletions

diff --git a/yardstick/common/exceptions.py b/yardstick/common/exceptions.py
index b39a0af9c..10c1f3f27 100644
--- a/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@ -79,6 +79,10 @@ class FunctionNotImplemented(YardstickException):
                '"%(class_name)" class.')
 
 
+class InvalidType(YardstickException):
+    message = 'Type "%(type_to_convert)s" is not valid'
+
+
 class InfluxDBConfigurationMissing(YardstickException):
     message = ('InfluxDB configuration is not available. Add "influxdb" as '
                'a dispatcher and the configuration section')
diff --git a/yardstick/common/utils.py b/yardstick/common/utils.py
index c019cd264..31885c073 100644
--- a/yardstick/common/utils.py
+++ b/yardstick/common/utils.py
@@ -21,6 +21,7 @@ import importlib
 import ipaddress
 import logging
 import os
+import pydoc
 import random
 import re
 import signal
@@ -578,3 +579,24 @@ def send_socket_command(host, port, command):
     finally:
         sock.close()
     return ret
+
+
+def safe_cast(value, type_to_convert, default_value):
+    """Convert value to type, in case of error return default_value
+
+    :param value: value to convert
+    :param type_to_convert: type to convert, could be "type" or "string"
+    :param default_value: default value to return
+    :return: converted value or default_value
+    """
+    if isinstance(type_to_convert, type):
+        _type = type_to_convert
+    else:
+        _type = pydoc.locate(type_to_convert)
+        if not _type:
+            raise exceptions.InvalidType(type_to_convert=type_to_convert)
+
+    try:
+        return _type(value)
+    except ValueError:
+        return default_value
diff --git a/yardstick/network_services/vnf_generic/vnf/tg_rfc2544_ixia.py b/yardstick/network_services/vnf_generic/vnf/tg_rfc2544_ixia.py
index 8927ce156..94ab06980 100644
--- a/yardstick/network_services/vnf_generic/vnf/tg_rfc2544_ixia.py
+++ b/yardstick/network_services/vnf_generic/vnf/tg_rfc2544_ixia.py
@@ -83,9 +83,9 @@ class IxiaResourceHelper(ClientResourceHelper):
                     'out_packets': int(stats['Frames_Tx'][port_num]),
                     'RxThroughput': float(stats['Valid_Frames_Rx'][port_num]) / duration,
                     'TxThroughput': float(stats['Frames_Tx'][port_num]) / duration,
-                    'Store-Forward_Avg_latency_ns': avg_latency,
-                    'Store-Forward_Min_latency_ns': min_latency,
-                    'Store-Forward_Max_latency_ns': max_latency
+                    'Store-Forward_Avg_latency_ns': utils.safe_cast(avg_latency, int, 0),
+                    'Store-Forward_Min_latency_ns': utils.safe_cast(min_latency, int, 0),
+                    'Store-Forward_Max_latency_ns': utils.safe_cast(max_latency, int, 0)
                 }
             except IndexError:
                 pass
diff --git a/yardstick/tests/unit/common/test_utils.py b/yardstick/tests/unit/common/test_utils.py
index ef4142148..3cf6c4d05 100644
--- a/yardstick/tests/unit/common/test_utils.py
+++ b/yardstick/tests/unit/common/test_utils.py
@@ -1391,3 +1391,19 @@ class GetPortIPTestCase(unittest.TestCase):
 
     def test_return_value(self):
         self.assertEqual('foo', utils.get_port_ip(self.ssh_client, 99))
+
+
+class SafeCaseTestCase(unittest.TestCase):
+
+    def test_correct_type_int(self):
+        self.assertEqual(35, utils.safe_cast('35', int, 0))
+
+    def test_correct_int_as_string(self):
+        self.assertEqual(25, utils.safe_cast('25', 'int', 0))
+
+    def test_incorrect_type_as_string(self):
+        with self.assertRaises(exceptions.InvalidType):
+            utils.safe_cast('100', 'intt', 0)
+
+    def test_default_value(self):
+        self.assertEqual(0, utils.safe_cast('', 'int', 0))