docker-adsb-ultrafeeder/rootfs/scripts/interpret_ultrafeeder_config

#!/usr/bin/with-contenv bash

# shellcheck shell=bash disable=SC2015
#
# This scripts should be sourced by the /etc/services.d/xxx/run modules for
# readsb, mlat-client, and mlathub. It interprets the ULTRAFEEDER_CONFIG / ULTRAFEEDER_NET_CONNECTOR parameter
# and makes individual net-connector strings available for these three modules.
#
#---------------------------------------------------------------------------------------------
# Copyright (C) 2023, Ramon F. Kolb (kx1t)
#
# This program 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 3 of the License, or (at your option)
# any later version.
#
# This program 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 program.
# If not, see <https://www.gnu.org/licenses/>.
#---------------------------------------------------------------------------------------------
#
# Note:
# ULTRAFEEDER_CONFIG and ULTRAFEEDER_NET_CONNECTOR can be used interchangeably
# If both are defined, they will be considered jointly.
#
# Format:
# ULTRAFEEDER_CONFIG=adsb,host,port,protocol[,uuid=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX][,extra-arguments]
# ULTRAFEEDER_CONFIG=mlat,host,port[,return_port][,uuid=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX][,extra-arguments]
# ULTRAFEEDER_CONFIG=mlathub,host,port,protocol[,uuid=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX][,extra-arguments]
#
# The ULTRAFEEDER_CONFIG parameter can have multiple config strings, separated by a `;`
# Please note that the config strings cannot contain `;` or `,` -- undefined things may happen if these characters are present.
#
# In the above configuration strings:
# `host` is an IP address. Specify an IP/hostname/containername for incoming or outgoing connections.
# `port` is a TCP port number
# `protocol` can be one of the following:
#    `beast_reduce_out`: Beast-format output with lower data throughput (saves bandwidth and CPU)
#    `beast_reduce_plus_out`: Beast-format output with extra data (UUID). This is the preferred format when feeding the "new" aggregator services
#    `beast_out`: Beast-format output
#    `beast_in`: Beast-format input
#    `raw_out`: Raw output
#    `raw_in`: Raw input
#    `sbs_out`: SBS-format output
#    `vrs_out`: SBS-format output
# `uuid=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX` is an optional parameter that sets the UUID for this specific instance.
#     It will override the global `UUID` parameter. This is only needed when you want to send different UUIDs to different aggregators.
# `input_connect=host:port is an optional parameter that sets the input_connect values for this instance`
# `lat=xxxx` is an optional parameter that sets the latitude for this specific instance
# `lon=xxxx` is an optional parameter that sets the longitude for this specific instance
# `alt=xxxx` is an optional parameter that sets the altitude for this specific instance
# `extra-arguments` can be any additional command line argument you want to pass to readsb, mlathub, or mlat-client
#     Example: `--net-only`. Please make sure to only once pass in an extra argument for each of the adsb|mlat|mlathub service.

# Do some prep work:
# combine ULTRAFEEDER_CONFIG and ULTRAFEEDER_NET_CONNECTOR
ULTRAFEEDER_CONFIG="${ULTRAFEEDER_CONFIG}${ULTRAFEEDER_CONFIG:+;}${ULTRAFEEDER_NET_CONNECTOR}"
# remove any newlines:
ULTRAFEEDER_CONFIG="${ULTRAFEEDER_CONFIG//$'\n'/}"
# Strip any extraneous spaces:
ULTRAFEEDER_CONFIG="${ULTRAFEEDER_CONFIG#"${ULTRAFEEDER_CONFIG%%[![:space:]]*}"}"   # strip leading space
ULTRAFEEDER_CONFIG="${ULTRAFEEDER_CONFIG//; /;}"

# Now read each entry and parse it:

READSB_CONF_ARR=()
MLATHUB_CONF_ARR=()

readarray -td ";" configs < <(printf '%s' "${ULTRAFEEDER_CONFIG}")

# Now loop through the MLAT_CONFIG items and start up an Mlat_client for each of them:
for instance in "${configs[@]}"
do
    [[ -z "${instance}" ]] && continue || true
    # put individual params into the $params array:
    readarray -td "," param < <(printf '%s' "${instance}")

    # Process based on parameter string type in param[0]:
    param[0]="${param[0],,}"
    case "${param[0]}" in

        adsb)
            # parse arguments for main readsb
            # build net-connector string into $readsb_str
            # and add any extra arguments in as individual entries into READSB_CONF_ARR()
            readsb_str="${param[1]},${param[2]},${param[3]}"
            for ((i=4; i<${#param[*]}; i++))
            do
                if [[ "${param[i]:0:5}" == "uuid=" ]]; then
                    readsb_str="${readsb_str},${param[i]}"
                elif [[ -n "${param[i]}" ]]; then
                    READSB_CONF_ARR+=("${param[i]}")
                fi
            done
            # Now add $readsb_str to the READSB_CONF_ARR() as --net-connector argument:
            READSB_CONF_ARR+=("--net-connector=${readsb_str}")
        ;;

        mlat)
            # parse arguments for the individual MLAT clients.
            # In this case, the mlat-client run module will interpret everything
            # as long as it is in the MLAT_CONFIG parameter. So we'll just add that here.
            MLAT_CONFIG="${MLAT_CONFIG}${MLAT_CONFIG:+;}${instance#*,}"
        ;;

        mlathub)
            # parse arguments for mlat_hub
            # build net-connector string into $readsb_str
            # and add any extra arguments in as individual entries into MLATHUB_CONF_STR()
            mlathub_str="${param[1]},${param[2]},${param[3]}"
            for ((i=4; i<${#param[*]}; i++))
            do
                if [[ "${param[i]:0:5}" == "uuid=" ]]; then
                    mlathub_str="${readsb_str},${param[i]}"
                elif [[ -n "${param[i]}" ]]; then
                    MLATHUB_CONF_ARR+=("${param[i]}")
                fi
            done
            # Now add $readsb_str to the READSB_CONF_STR as --net-connector argument:
            MLATHUB_CONF_ARR+=("--net-connector=${mlathub_str}")
        ;;

        *)
            # Check if there's anything in ${ULTRAFEEDER_NET_CONNECTOR} -- if not, it's a bad config element. If yes, add it as if it were ADSB
            if [[ -z "${ULTRAFEEDER_NET_CONNECTOR}" ]]; then
                echo "[$(date)][${APPNAME}] Warning: skipping unknown ULTRAFEEDER_CONFIG config element \"${instance}\""
            else
                # parse arguments for main readsb
                # build net-connector string into $readsb_str
                # and add any extra arguments in as individual entries into READSB_CONF_ARR()
                readsb_str="${param[0]},${param[1]},${param[2]}"
                for ((i=3; i<${#param[*]}; i++))
                do
                    if [[ "${param[i]:0:5}" == "uuid=" ]]; then
                        readsb_str="${readsb_str},${param[i]}"
                    elif [[ -n "${param[i]}" ]]; then
                        READSB_CONF_ARR+=("${param[i]}")
                    fi
                done
                # Now add $readsb_str to the READSB_CONF_ARR() as --net-connector argument:
                READSB_CONF_ARR+=("--net-connector=${readsb_str}")
            fi
    esac

done