Separate files needing GPL license

+ Keep apache license for now, until this is completed:
  https://wiki.fd.io/view/TSC/Relicensing_Procedure
+ Add utilities for switching license comment blocks.
 - They do not preserve attributes, so executable flag is lost.
+ Move the affected files to GPL/.
 + Update paths so files are executed from the new location.
 + Change the way scripts are started to do not require executable flag.
 + Employ OptionString when constructing longer command lines.
+ Move also PacketVerifier.py and TrafficScriptArg.py
  as they are linked with traffic scripts.
 + That means the two files are outside "resources" package tree now.
 + Added __init__.py files so relative imports work in new package tree.
+ Start traffic scripts as python modules to allow relative imports.
 + Once again needed because they are outside the default PYTHONPATH.

Change-Id: Ieb135629e890adbaf5b79497570f3be25b746f9f
Signed-off-by: Vratko Polak <vrpolak@cisco.com>

8 files changed, 204 insertions, 503 deletions

diff --git a/resources/tools/block_replacer/apache2gpl.sh b/resources/tools/block_replacer/apache2gpl.sh
new file mode 100644
index 0000000000..f248393d50
--- /dev/null
+++ b/resources/tools/block_replacer/apache2gpl.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# 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.
+
+set -exuo pipefail
+
+if [[ "${#}" != "1" ]]; then
+    echo 'An utility to switch license comment blocks.'
+    echo 'Requires files "gpl_block.txt" and "apache_block.txt" in the working'
+    echo 'directory, and a single argument pointing to root directory.'
+    echo 'Affects only .sh and .py files.'
+    exit 1
+fi
+
+find "${1}" \( -name "*.py" -o -name "*.sh" \) -print0 | xargs -0 \
+python3 replace.py "apache_block.txt" "gpl_block.txt"
diff --git a/resources/tools/block_replacer/apache_block.txt b/resources/tools/block_replacer/apache_block.txt
new file mode 100644
index 0000000000..790a3c4ea1
--- /dev/null
+++ b/resources/tools/block_replacer/apache_block.txt
@@ -0,0 +1,11 @@
+# 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.
diff --git a/resources/tools/block_replacer/gpl2apache.sh b/resources/tools/block_replacer/gpl2apache.sh
new file mode 100644
index 0000000000..a1ef8df075
--- /dev/null
+++ b/resources/tools/block_replacer/gpl2apache.sh
@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# 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.
+
+set -exuo pipefail
+
+if [[ "${#}" != "1" ]]; then
+    echo 'An utility to switch license comment blocks.'
+    echo 'Requires files "gpl_block.txt" and "apache_block.txt" in the working'
+    echo 'directory, and a single argument pointing to root directory.'
+    echo 'Affects only .sh and .py files.'
+    exit 1
+fi
+
+find "${1}" \( -name "*.py" -o -name "*.sh" \) -print0 | xargs -0 \
+python3 replace.py "gpl_block.txt" "apache_block.txt"
diff --git a/resources/tools/block_replacer/gpl_block.txt b/resources/tools/block_replacer/gpl_block.txt
new file mode 100644
index 0000000000..2dbbb2af06
--- /dev/null
+++ b/resources/tools/block_replacer/gpl_block.txt
@@ -0,0 +1,13 @@
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This file is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this file.  If not, see <https://www.gnu.org/licenses/>.
diff --git a/resources/tools/block_replacer/replace.py b/resources/tools/block_replacer/replace.py
new file mode 100644
index 0000000000..02d1889331
--- /dev/null
+++ b/resources/tools/block_replacer/replace.py
@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# 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.
+
+"""A script simplifying replacement of blocks of lines.
+
+A bash solution created by combining these two:
+    https://unix.stackexchange.com/a/181215
+    https://stackoverflow.com/a/23849180
+does not seem to work if the blocks contain complicated characters.
+"""
+
+import argparse
+import os
+import tempfile
+
+def main():
+    """Main function for the block replacing script."""
+
+    description = '''Replace a block of lines with another block.
+
+    Both block-to-replace and replacing-block are read from a file.
+    The replacement is performed on a file, in-place.
+    Only first block occurence is replaced.
+    If the block-to-replace is preceded by a partial match,
+    it may not be recognized.
+
+    The current implementation uses temporary files,
+    created in the working directory.
+    if something fails, thise temporary files need to be deleted manually.
+
+    TODO: Preserve target attributes. Maybe https://pypi.org/project/in-place/
+'''
+    parser = argparse.ArgumentParser(description)
+    parser.add_argument(
+        u"before", type=str,
+        help=u"Path to file containing the old content to replace."
+    )
+    parser.add_argument(
+        u"after", type=str,
+        help=u"Path to file containing the new content to replace with."
+    )
+    parser.add_argument(
+        u"targets", metavar=u"target", nargs=u"+", type=str,
+        help=u"Paths to file where the replacement should be made."
+    )
+    args = parser.parse_args()
+
+    do_it(args)
+
+
+def do_it(args):
+    """Read contents, create edited target, replace the original target with it.
+
+    :param args: Parsed command line arguments.
+    :type args: Object (typically argparse.Namespace) which contains
+        "before", "after" and "target" fields.
+    """
+    with open(args.before, u"r") as file_in:
+        content_before = file_in.readlines()
+    before_len = len(content_before)
+    with open(args.after, u"r") as file_in:
+        content_after = file_in.readlines()
+
+    for target in args.targets:
+        with tempfile.NamedTemporaryFile(
+            dir=u".", mode=u"w", delete=False
+        ) as file_out:
+            with open(target, u"r") as file_in:
+                # Phase one, searching for content, copying what does not match.
+                buffer_lines = list()
+                line_index_to_check = 0
+                content_found = False
+                while 1:
+                    line_in = file_in.readline()
+                    if not line_in:
+                        print(f"{target}: Content not found.")
+                        for line_out in buffer_lines:
+                            file_out.write(line_out)
+                        buffer_lines = list()
+                        break
+                    if line_in != content_before[line_index_to_check]:
+                        line_index_to_check = 0
+                        if buffer_lines:
+                            for line_out in buffer_lines:
+                                file_out.write(line_out)
+                            buffer_lines = list()
+                        file_out.write(line_in)
+                        continue
+                    buffer_lines.append(line_in)
+                    line_index_to_check += 1
+                    if line_index_to_check < before_len:
+                        continue
+                    # Buffer has the match! Do not write it.
+                    content_found = True
+                    break
+                if not content_found:
+                    file_out.close()
+                    os.remove(file_out.name)
+                    continue
+                # Phase two, write the replacement instead.
+                for line_out in content_after:
+                    file_out.write(line_out)
+                # Phase three, copy the rest of the file.
+                while 1:
+                    line_in = file_in.readline()
+                    if not line_in:
+                        print(f"{target}: Replacement done.")
+                        break
+                    file_out.write(line_in)
+        os.replace(file_out.name, target)
+
+
+if __name__ == u"__main__":
+    main()
diff --git a/resources/tools/trex/trex_server_info.py b/resources/tools/trex/trex_server_info.py
deleted file mode 100755
index b34709b206..0000000000
--- a/resources/tools/trex/trex_server_info.py
+++ /dev/null
@@ -1,54 +0,0 @@
-#!/usr/bin/python3
-
-# Copyright (c) 2019 Cisco and/or its affiliates.
-# 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.
-
-"""This script uses T-REX stateless API to drive t-rex instance.
-
-Requirements:
-- T-REX: https://github.com/cisco-system-traffic-generator/trex-core
- - compiled and running T-REX process (eg. ./t-rex-64 -i)
- - trex.stl.api library
-- Script must be executed on a node with T-REX instance
-
-Functionality:
-1. Verify the API functionality and get server information
-
-"""
-
-import sys
-
-sys.path.insert(
-    0, u"/opt/trex-core-2.73/scripts/automation/trex_control_plane/interactive/"
-)
-from trex.stl.api import *
-
-
-def main():
-    """Check server info and quit."""
-    client = STLClient()
-    try:
-        # connect to server
-        client.connect()
-
-        # get server info
-        print(client.get_server_system_info())
-    except STLError as ex_error:
-        print(ex_error, file=sys.stderr)
-        sys.exit(1)
-    finally:
-        client.disconnect()
-
-
-if __name__ == u"__main__":
-    main()
diff --git a/resources/tools/trex/trex_stateless_profile.py b/resources/tools/trex/trex_stateless_profile.py
deleted file mode 100755
index a0de5c0cd3..0000000000
--- a/resources/tools/trex/trex_stateless_profile.py
+++ /dev/null
@@ -1,345 +0,0 @@
-#!/usr/bin/python3
-
-# Copyright (c) 2020 Cisco and/or its affiliates.
-# 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.
-
-"""This module gets a traffic profile together with other parameters, reads
-the profile and sends the traffic. At the end, it measures the packet loss and
-latency.
-"""
-
-import argparse
-import json
-import sys
-import time
-
-sys.path.insert(
-    0, u"/opt/trex-core-2.73/scripts/automation/trex_control_plane/interactive/"
-)
-from trex.stl.api import *
-
-
-def fmt_latency(lat_min, lat_avg, lat_max, hdrh):
-    """Return formatted, rounded latency.
-
-    :param lat_min: Min latency
-    :param lat_avg: Average latency
-    :param lat_max: Max latency
-    :param hdrh: Base64 encoded compressed HDRHistogram object.
-    :type lat_min: str
-    :type lat_avg: str
-    :type lat_max: str
-    :type hdrh: str
-    :return: Formatted and rounded output (hdrh unchanged) "min/avg/max/hdrh".
-    :rtype: str
-    """
-    try:
-        t_min = int(round(float(lat_min)))
-    except ValueError:
-        t_min = int(-1)
-    try:
-        t_avg = int(round(float(lat_avg)))
-    except ValueError:
-        t_avg = int(-1)
-    try:
-        t_max = int(round(float(lat_max)))
-    except ValueError:
-        t_max = int(-1)
-
-    return u"/".join(str(tmp) for tmp in (t_min, t_avg, t_max, hdrh))
-
-
-def simple_burst(
-        profile_file, duration, framesize, rate, warmup_time, port_0, port_1,
-        latency, async_start=False, traffic_directions=2, force=False):
-    """Send traffic and measure packet loss and latency.
-
-    Procedure:
-     - reads the given traffic profile with streams,
-     - connects to the T-rex client,
-     - resets the ports,
-     - removes all existing streams,
-     - adds streams from the traffic profile to the ports,
-     - if the warm-up time is more than 0, sends the warm-up traffic, reads the
-       statistics,
-     - clears the statistics from the client,
-     - starts the traffic,
-     - waits for the defined time (or runs forever if async mode is defined),
-     - stops the traffic,
-     - reads and displays the statistics and
-     - disconnects from the client.
-
-    :param profile_file: A python module with T-rex traffic profile.
-    :param framesize: Frame size.
-    :param duration: Duration of traffic run in seconds (-1=infinite).
-    :param rate: Traffic rate [percentage, pps, bps].
-    :param warmup_time: Traffic warm-up time in seconds, 0 = disable.
-    :param port_0: Port 0 on the traffic generator.
-    :param port_1: Port 1 on the traffic generator.
-    :param latency: With latency stats.
-    :param async_start: Start the traffic and exit.
-    :param traffic_directions: Bidirectional (2) or unidirectional (1) traffic.
-    :param force: Force start regardless of ports state.
-    :type profile_file: str
-    :type framesize: int or str
-    :type duration: float
-    :type rate: str
-    :type warmup_time: float
-    :type port_0: int
-    :type port_1: int
-    :type latency: bool
-    :type async_start: bool
-    :type traffic_directions: int
-    :type force: bool
-    """
-    client = None
-    total_rcvd = 0
-    total_sent = 0
-    approximated_duration = 0
-    approximated_rate = 0
-    lost_a = 0
-    lost_b = 0
-    lat_a = u"-1/-1/-1/"
-    lat_b = u"-1/-1/-1/"
-
-    # Read the profile:
-    try:
-        print(f"### Profile file:\n{profile_file}")
-        profile = STLProfile.load(
-            profile_file, direction=0, port_id=0, framesize=framesize
-        )
-        streams = profile.get_streams()
-    except STLError as err:
-        print(f"Error while loading profile '{profile_file}' {err!r}")
-        sys.exit(1)
-
-    try:
-        # Create the client:
-        client = STLClient()
-        # Connect to server:
-        client.connect()
-        # Prepare our ports (the machine has 0 <--> 1 with static route):
-        client.reset(ports=[port_0, port_1])
-        client.remove_all_streams(ports=[port_0, port_1])
-
-        if u"macsrc" in profile_file:
-            client.set_port_attr(ports=[port_0, port_1], promiscuous=True)
-        if isinstance(framesize, int):
-            client.add_streams(streams[0], ports=[port_0])
-            if traffic_directions > 1:
-                client.add_streams(streams[1], ports=[port_1])
-        elif isinstance(framesize, str):
-            client.add_streams(streams[0:3], ports=[port_0])
-            if traffic_directions > 1:
-                client.add_streams(streams[3:6], ports=[port_1])
-        if latency:
-            try:
-                if isinstance(framesize, int):
-                    client.add_streams(streams[2], ports=[port_0])
-                    if traffic_directions > 1:
-                        client.add_streams(streams[3], ports=[port_1])
-                elif isinstance(framesize, str):
-                    latency = False
-            except STLError:
-                # Disable latency if NIC does not support requested stream type
-                print(u"##### FAILED to add latency streams #####")
-                latency = False
-        ports = [port_0]
-        if traffic_directions > 1:
-            ports.append(port_1)
-        # Warm-up phase:
-        if warmup_time > 0:
-            # Clear the stats before injecting:
-            client.clear_stats()
-
-            # Choose rate and start traffic:
-            client.start(ports=ports, mult=rate, duration=warmup_time,
-                         force=force)
-
-            # Block until done:
-            time_start = time.monotonic()
-            client.wait_on_traffic(ports=ports, timeout=warmup_time+30)
-            time_stop = time.monotonic()
-            approximated_duration = time_stop - time_start
-
-            if client.get_warnings():
-                for warning in client.get_warnings():
-                    print(warning)
-
-            # Read the stats after the test:
-            stats = client.get_stats()
-
-            print(u"##### Warmup statistics #####")
-            print(json.dumps(stats, indent=4, separators=(u",", u": ")))
-
-            lost_a = stats[port_0][u"opackets"] - stats[port_1][u"ipackets"]
-            if traffic_directions > 1:
-                lost_b = stats[port_1][u"opackets"] - stats[port_0][u"ipackets"]
-
-            print(f"\npackets lost from {port_0} --> {port_1}: {lost_a} pkts")
-            if traffic_directions > 1:
-                print(f"packets lost from {port_1} --> {port_0}: {lost_b} pkts")
-
-        # Clear the stats before injecting:
-        client.clear_stats()
-        lost_a = 0
-        lost_b = 0
-
-        # Choose rate and start traffic:
-        client.start(ports=ports, mult=rate, duration=duration)
-
-        if async_start:
-            # For async stop, we need to export the current snapshot.
-            xsnap0 = client.ports[0].get_xstats().reference_stats
-            print(f"Xstats snapshot 0: {xsnap0!r}")
-            if traffic_directions > 1:
-                xsnap1 = client.ports[1].get_xstats().reference_stats
-                print(f"Xstats snapshot 1: {xsnap1!r}")
-        else:
-            # Block until done:
-            time_start = time.monotonic()
-            client.wait_on_traffic(ports=ports, timeout=duration+30)
-            time_stop = time.monotonic()
-            approximated_duration = time_stop - time_start
-
-            if client.get_warnings():
-                for warning in client.get_warnings():
-                    print(warning)
-
-            # Read the stats after the test
-            stats = client.get_stats()
-
-            print(u"##### Statistics #####")
-            print(json.dumps(stats, indent=4, separators=(u",", u": ")))
-
-            lost_a = stats[port_0][u"opackets"] - stats[port_1][u"ipackets"]
-            if traffic_directions > 1:
-                lost_b = stats[port_1][u"opackets"] - stats[port_0][u"ipackets"]
-
-            # Stats index is not a port number, but "pgid".
-            if latency:
-                lat_obj = stats[u"latency"][0][u"latency"]
-                lat_a = fmt_latency(
-                    str(lat_obj[u"total_min"]), str(lat_obj[u"average"]),
-                    str(lat_obj[u"total_max"]), str(lat_obj[u"hdrh"]))
-                if traffic_directions > 1:
-                    lat_obj = stats[u"latency"][1][u"latency"]
-                    lat_b = fmt_latency(
-                        str(lat_obj[u"total_min"]), str(lat_obj[u"average"]),
-                        str(lat_obj[u"total_max"]), str(lat_obj[u"hdrh"]))
-
-            if traffic_directions > 1:
-                total_sent = stats[0][u"opackets"] + stats[1][u"opackets"]
-                total_rcvd = stats[0][u"ipackets"] + stats[1][u"ipackets"]
-            else:
-                total_sent = stats[port_0][u"opackets"]
-                total_rcvd = stats[port_1][u"ipackets"]
-            try:
-                approximated_rate = total_sent / approximated_duration
-            except ZeroDivisionError:
-                pass
-
-            print(f"\npackets lost from {port_0} --> {port_1}: {lost_a} pkts")
-            if traffic_directions > 1:
-                print(f"packets lost from {port_1} --> {port_0}: {lost_b} pkts")
-
-    except STLError as ex_error:
-        print(ex_error, file=sys.stderr)
-        sys.exit(1)
-
-    finally:
-        if async_start:
-            if client:
-                client.disconnect(stop_traffic=False, release_ports=True)
-        else:
-            if client:
-                client.disconnect()
-            print(
-                f"rate={rate!r}, totalReceived={total_rcvd}, "
-                f"totalSent={total_sent}, frameLoss={lost_a + lost_b}, "
-                f"targetDuration={duration!r}, "
-                f"approximatedDuration={approximated_duration!r}, "
-                f"approximatedRate={approximated_rate}, "
-                f"latencyStream0(usec)={lat_a}, latencyStream1(usec)={lat_b}, "
-            )
-
-
-def main():
-    """Main function for the traffic generator using T-rex.
-
-    It verifies the given command line arguments and runs "simple_burst"
-    function.
-    """
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        u"-p", u"--profile", required=True, type=str,
-        help=u"Python traffic profile."
-    )
-    parser.add_argument(
-        u"-d", u"--duration", required=True, type=float,
-        help=u"Duration of traffic run."
-    )
-    parser.add_argument(
-        u"-s", u"--frame_size", required=True,
-        help=u"Size of a Frame without padding and IPG."
-    )
-    parser.add_argument(
-        u"-r", u"--rate", required=True,
-        help=u"Traffic rate with included units (%, pps)."
-    )
-    parser.add_argument(
-        u"-w", u"--warmup_time", type=float, default=5.0,
-        help=u"Traffic warm-up time in seconds, 0 = disable."
-    )
-    parser.add_argument(
-        u"--port_0", required=True, type=int,
-        help=u"Port 0 on the traffic generator."
-    )
-    parser.add_argument(
-        u"--port_1", required=True, type=int,
-        help=u"Port 1 on the traffic generator."
-    )
-    parser.add_argument(
-        u"--async_start", action=u"store_true", default=False,
-        help=u"Non-blocking call of the script."
-    )
-    parser.add_argument(
-        u"--latency", action=u"store_true", default=False,
-        help=u"Add latency stream."
-    )
-    parser.add_argument(
-        u"--traffic_directions", type=int, default=2,
-        help=u"Send bi- (2) or uni- (1) directional traffic."
-    )
-    parser.add_argument(
-        u"--force", action=u"store_true", default=False,
-        help=u"Force start regardless of ports state."
-    )
-
-    args = parser.parse_args()
-
-    try:
-        framesize = int(args.frame_size)
-    except ValueError:
-        framesize = args.frame_size
-
-    simple_burst(
-        profile_file=args.profile, duration=args.duration, framesize=framesize,
-        rate=args.rate, warmup_time=args.warmup_time, port_0=args.port_0,
-        port_1=args.port_1, latency=args.latency, async_start=args.async_start,
-        traffic_directions=args.traffic_directions, force=args.force
-    )
-
-
-if __name__ == u"__main__":
-    main()
diff --git a/resources/tools/trex/trex_stateless_stop.py b/resources/tools/trex/trex_stateless_stop.py
deleted file mode 100755
index 5e8721d28c..0000000000
--- a/resources/tools/trex/trex_stateless_stop.py
+++ /dev/null
@@ -1,104 +0,0 @@
-#!/usr/bin/python3
-
-# Copyright (c) 2020 Cisco and/or its affiliates.
-# 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.
-
-"""This script uses T-REX stateless API to drive t-rex instance.
-
-Requirements:
-- T-REX: https://github.com/cisco-system-traffic-generator/trex-core
- - compiled and running T-REX process (eg. ./t-rex-64 -i)
- - trex.stl.api library
-- Script must be executed on a node with T-REX instance
-
-Functionality:
-1. Stop any running traffic
-2. Optionally restore reference counter values.
-3. Return conter differences.
-"""
-
-import argparse
-import json
-import sys
-
-from collections import OrderedDict  # Needed to parse xstats representation.
-
-sys.path.insert(
-    0, u"/opt/trex-core-2.73/scripts/automation/trex_control_plane/interactive/"
-)
-from trex.stl.api import *
-
-
-def main():
-    """Stop traffic if any is running. Report xstats."""
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        u"--xstat0", type=str, default=u"",
-        help=u"Reference xstat object if any."
-    )
-    parser.add_argument(
-        u"--xstat1", type=str, default=u"",
-        help=u"Reference xstat object if any."
-    )
-    args = parser.parse_args()
-
-    client = STLClient()
-    try:
-        # connect to server
-        client.connect()
-
-        client.acquire(force=True)
-        # TODO: Support unidirection.
-        client.stop(ports=[0, 1])
-
-        # Read the stats after the test,
-        # we need to update values before the last trial started.
-        if args.xstat0:
-            snapshot = eval(args.xstat0)
-            client.ports[0].get_xstats().reference_stats = snapshot
-        if args.xstat1:
-            snapshot = eval(args.xstat1)
-            client.ports[1].get_xstats().reference_stats = snapshot
-        # Now we can call the official method to get differences.
-        xstats0 = client.get_xstats(0)
-        xstats1 = client.get_xstats(1)
-
-    # If STLError happens, let the script fail with stack trace.
-    finally:
-        client.disconnect()
-
-    print(u"##### statistics port 0 #####")
-    print(json.dumps(xstats0, indent=4, separators=(u",", u": ")))
-    print(u"##### statistics port 1 #####")
-    print(json.dumps(xstats1, indent=4, separators=(u",", u": ")))
-
-    tx_0, rx_0 = xstats0[u"tx_good_packets"], xstats0[u"rx_good_packets"]
-    tx_1, rx_1 = xstats1[u"tx_good_packets"], xstats1[u"rx_good_packets"]
-    lost_a, lost_b = tx_0 - rx_1, tx_1 - rx_0
-
-    print(f"\npackets lost from 0 --> 1:   {lost_a} pkts")
-    print(f"packets lost from 1 --> 0:   {lost_b} pkts")
-
-    total_rcvd, total_sent = rx_0 + rx_1, tx_0 + tx_1
-    total_lost = total_sent - total_rcvd
-    # TODO: Add latency.
-    print(
-        f"rate='unknown', totalReceived={total_rcvd}, totalSent={total_sent}, "
-        f"frameLoss={total_lost}, targetDuration='manual', "
-        f"approximatedDuration='manual', approximatedRate='unknown', "
-        f"latencyStream0(usec)=-1/-1/-1, latencyStream1(usec)=-1/-1/-1"
-    )
-
-
-if __name__ == u"__main__":
-    main()