xena_pairs: Add pairs topology for 2544 testing

Add xena pairs topology and port removal options for JSON
files with RFC2544 testing.  Refactored JSON code for
better expansion later.

Resolved pathing issues related to previous patch allowing
for execution of VSPerf from any directory.

JIRA: VSPERF-502

Change-Id: Ida60c1223ae0f45f8879351770ab7fdce859b59b
Signed-off-by: Christian Trautman <ctrautma@redhat.com>

1 files changed, 105 insertions, 0 deletions

diff --git a/tools/pkt_gen/xena/json/json_utilities.py b/tools/pkt_gen/xena/json/json_utilities.py
new file mode 100644
index 00000000..857aa102
--- /dev/null
+++ b/tools/pkt_gen/xena/json/json_utilities.py
@@ -0,0 +1,105 @@
+# Copyright 2017 Red Hat Inc & Xena Networks.
+#
+# Licensed 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.
+
+# Contributors:
+#   Dan Amzulescu, Xena Networks
+#   Christian Trautman, Red Hat Inc.
+
+"""JSON utility module"""
+
+import base64
+import json
+import locale
+import logging
+import uuid
+
+_LOGGER = logging.getLogger(__name__)
+_LOCALE = locale.getlocale()[1]
+
+def create_segment(header_type, encode_64_string):
+    """
+    Create segment for JSON file
+    :param header_type: Type of header as string
+    :param encode_64_string: 64 byte encoded string value of the hex bytes
+    :return: segment as dictionary
+    """
+    return {
+        "SegmentType": header_type.upper(),
+        "SegmentValue": encode_64_string,
+        "ItemID": str(uuid.uuid4()),
+        "ParentID": "",
+        "Label": ""}
+
+
+def decode_byte_array(enc_str):
+    """ Decodes the base64-encoded string to a byte array
+    :param enc_str: The base64-encoded string representing a byte array
+    :return: The decoded byte array
+    """
+    dec_string = base64.b64decode(enc_str)
+    barray = bytearray()
+    barray.extend(dec_string)
+    return barray
+
+
+def encode_byte_array(byte_arr):
+    """ Encodes the byte array as a base64-encoded string
+    :param byte_arr: A bytearray containing the bytes to convert
+    :return: A base64 encoded string
+    """
+    enc_string = base64.b64encode(bytes(byte_arr))
+    return enc_string
+
+
+def read_json_file(json_file):
+    """
+    Read the json file path and return a dictionary of the data
+    :param json_file: path to json file
+    :return: dictionary of json data
+    """
+    try:
+        with open(json_file, 'r', encoding=_LOCALE) as data_file:
+            file_data = json.loads(data_file.read())
+    except ValueError as exc:
+        # general json exception, Python 3.5 adds new exception type
+        _LOGGER.exception("Exception with json read: %s", exc)
+        raise
+    except IOError as exc:
+        _LOGGER.exception(
+            'Exception during file open: %s file=%s', exc, json_file)
+        raise
+    return file_data
+
+
+def write_json_file(json_data, output_path):
+    """
+    Write out the dictionary of data to a json file
+    :param json_data: dictionary of json data
+    :param output_path: file path to write output
+    :return: Boolean if success
+    """
+    try:
+        with open(output_path, 'w', encoding=_LOCALE) as fileh:
+            json.dump(json_data, fileh, indent=2, sort_keys=True,
+                      ensure_ascii=True)
+        return True
+    except ValueError as exc:
+        # general json exception, Python 3.5 adds new exception type
+        _LOGGER.exception(
+            "Exception with json write: %s", exc)
+        return False
+    except IOError as exc:
+        _LOGGER.exception(
+            'Exception during file write: %s file=%s', exc, output_path)
+        return False