docker-adsb-ultrafeeder/rootfs/etc/services.d/mlathub/run

#!/usr/bin/with-contenv bash
# shellcheck shell=bash disable=SC1091,SC2015,SC2016

APPNAME="mlathub"
source /scripts/common
source /scripts/interpret_ultrafeeder_config

if [[ -z "${MLAT_CONFIG}" ]] && [[ -z "$MLATHUB_NET_CONNECTOR" ]]; then
    s6wrap --prepend="${APPNAME}" --timestamps --args echo "No MLAT servers have been defined in MLAT_CONFIG and no external sources have been defined in MLATHUB_NET_CONNECTOR - no need to start MLATHUB"
    sleep infinity
fi

if chk_enabled "${MLATHUB_DISABLED}"; then
    s6wrap --prepend="${APPNAME}" --timestamps --args echo "MLATHUB is disabled."
    sleep infinity
fi

# Build the readsb command line based on options
MLATHUB_BIN="/usr/local/bin/readsb"

# set some basic options:
MLATHUB_CMD=("--net")
MLATHUB_CMD+=("--quiet")
MLATHUB_CMD+=("--net-only")
MLATHUB_CMD+=("--mlat")
MLATHUB_CMD+=("--forward-mlat")
MLATHUB_CMD+=("--forward-mlat-sbs")

MLATHUB_CMD+=("--net-connector=localhost,30004,beast_reduce_out")

# define some more ports:
MLATHUB_CMD+=("--net-sbs-port=${MLATHUB_SBS_OUT_PORT:-31003}")
MLATHUB_CMD+=("--net-bi-port=${MLATHUB_BEAST_IN_PORT:-31004}")
MLATHUB_CMD+=("--net-bo-port=${MLATHUB_BEAST_OUT_PORT:-31005}")
MLATHUB_CMD+=("--net-beast-reduce-out-port=${MLATHUB_BEAST_REDUCE_OUT_PORT:-31006}")

# We need to get the mlat results ports from the parameters:
# parse MLAT_CONFIG string into mlat_configs array
readarray -td ";" mlat_configs < <(printf '%s' "${MLAT_CONFIG// /}")
# Now loop through the MLAT_CONFIG items and add a net-connector for each of them:
mlat_result_sources=0
for instance in "${mlat_configs[@]}"
do
    # shellcheck disable=SC2015
    [[ -z "${instance}" ]] && continue || true
    # put individual params into the $params array:
    readarray -td "," params < <(printf '%s' "${instance}")

    for ((i=2; i<${#params[*]}; i++))
    do
        if [[ -n "${params[i]}" ]] && [[ "${params[i]}" =~ ^[0-9]+$ ]]; then
            # the parameter is a number and it is assumed that this is the beast_results port
            MLATHUB_CMD+=("--net-connector=localhost,${params[i]},beast_in")
            (( mlat_result_sources++ )) || true
            break
        fi
    done
done

if (( mlat_result_sources == 0 ))
then
    s6wrap --prepend="${APPNAME}" --timestamps --args echo "No MLAT servers have been defined in MLAT_CONFIG - no need to start MLATHUB"
    sleep infinity
fi

# Add any additional net_connectors:
if [[ -n "$MLATHUB_NET_CONNECTOR" ]]; then
        # Strip any extraneous spaces:
    MLATHUB_NET_CONNECTOR="${MLATHUB_NET_CONNECTOR#"${MLATHUB_NET_CONNECTOR%%[![:space:]]*}"}"   # strip leading spaces
    MLATHUB_NET_CONNECTOR="${MLATHUB_NET_CONNECTOR//; /;}"      # strip space after semicolon
    IFS=';' read -r -a MLATHUB_NET_CONNECTOR_ARRAY <<< "$MLATHUB_NET_CONNECTOR"
    for NET_CONNECTOR_ELEMENT in "${MLATHUB_NET_CONNECTOR_ARRAY[@]}"
    do
        MLATHUB_CMD+=("--net-connector=${NET_CONNECTOR_ELEMENT}")
    done
fi

# Handle ULTRAFEEDER_CONFIG / ULTRAFEEDER_NET_CONNECTOR elements relevant to readsb:
[[ "${#MLATHUB_CONF_ARR[@]}" -gt 0 ]] && MLATHUB_CMD+=("${MLATHUB_CONF_ARR[@]}") || true

if chk_enabled "${READSB_DEBUG}"; then
    MLATHUB_CMD+=("--debug=$READSB_DEBUG")
fi

if [ -n "${LAT}" ]; then
    MLATHUB_CMD+=(--lat "${LAT}")
elif [ -n "${READSB_LAT}" ]; then
    MLATHUB_CMD+=(--lat "${READSB_LAT}")
fi

if [ -n "${LONG}" ]; then
    MLATHUB_CMD+=(--lon "${LONG}")
elif [ -n "${READSB_LON}" ]; then
    MLATHUB_CMD+=(--lon "${READSB_LON}")
fi

# Handle "--max-range=<dist>"
if [[ -n "$READSB_MAX_RANGE" ]]; then
    MLATHUB_CMD+=("--max-range=$READSB_MAX_RANGE")
fi

# Handle "--net-connector-delay=<seconds>"
if [[ -n "$READSB_NET_CONNECTOR_DELAY" ]]; then
    MLATHUB_CMD+=("--net-connector-delay=$READSB_NET_CONNECTOR_DELAY")
fi

# Handle "--net-heartbeat=<rate>"
MLATHUB_CMD+=("--net-heartbeat=${READSB_NET_HEARTBEAT:-35}")

if [[ ! -f /run/mlathub_up ]]
then
    s6wrap --prepend="${APPNAME}" --timestamps --args echo "Delaying MLAT hub start until container is established..."
    while [[ ! -f /run/mlathub_up ]]
    do
        sleep 2
    done
fi
sleep 5     # sleep a bit so everything is well established

s6wrap --prepend="${APPNAME}" --timestamps --args echo "Starting MLATHUB..."

# shellcheck disable=SC2086,SC2069
if [[ -z "${LOGLEVEL}" ]] || [[ "${LOGLEVEL,,}" == "verbose" ]]; then
    s6wrap --prepend="${APPNAME}" --timestamps --args "${MLATHUB_BIN}" "${MLATHUB_CMD[@]}" $MLATHUB_EXTRA_ARGS 2>&1
elif [[ "${LOGLEVEL,,}" == "error" ]]; then
    s6wrap --prepend="${APPNAME}" --timestamps --args "${MLATHUB_BIN}" "${MLATHUB_CMD[@]}" $MLATHUB_EXTRA_ARGS 2>&1 >/dev/null
elif [[ "${LOGLEVEL,,}" == "none" ]]; then
    s6wrap --prepend="${APPNAME}" --timestamps --args "${MLATHUB_BIN}" "${MLATHUB_CMD[@]}" $MLATHUB_EXTRA_ARGS >/dev/null 2>/dev/null 
fi

s6wrap --prepend="${APPNAME}" --timestamps --args echo "WARNING: The mlathub instance has exited. Restarting in 10 seconds."
sleep 10