#!/usr/bin/env bash
#
# Integration loopback test for villas pipe.
#
# Author: Steffen Vogel <post@steffenvogel.de>
# SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
# SPDX-License-Identifier: Apache-2.0

if ! modprobe -aqn sch_prio sch_netem cls_fw; then
    echo "Netem / TC kernel modules are missing"
    exit 99
fi

if [[ "${EUID}" -ne 0 ]]; then
    echo "Test requires root permissions"
    exit 99
fi

set -e

DIR=$(mktemp -d)
pushd ${DIR}

function finish {
    popd
    rm -rf ${DIR}
}
trap finish EXIT

NUM_SAMPLES=${NUM_SAMPLES:-10}

cat > config.json << EOF
{
    "nodes": {
        "node1": {
             "type"   : "socket",
             "format": "protobuf",

             "in": {
             	"address": "*:12000"
             },
             "out": {
             	"address": "127.0.0.1:12000",
             	"netem": {
             		"enabled": true,
             		"delay": 100000,
             		"jitter": 30000,
             		"loss": 20
             	}
             }
        }
    }
}
EOF

villas signal -l ${NUM_SAMPLES} -n random > input.dat

villas pipe -l ${NUM_SAMPLES} config.json node1 > output.dat < input.dat

# Check network emulation characteristics
villas hook -o verbose=true -o format=json stats < output.dat > /dev/null
