#!/bin/sh

set -eu
umask 077

community="public"

mqtt_send() {
    topic="$1"
    value="$2"

    tlsdir="$(openssl version -d | sed -e 's/^OPENSSLDIR: "\(.\+\)"$/\1/')"
    mosquitto_pub -h mqtt02.home.foo.sh -t "$topic" -m "$value" \
        --cafile "${tlsdir}/certs/ca.crt" \
        --key "${tlsdir}/private/$(hostname -f).key" \
        --cert "${tlsdir}/certs/$(hostname -f).crt"
}

snmp_get() {
    host="$1"
    key="$2"
    snmpget -v 1 -c "$community" "$host" -Oqv -m ATEN-PE-CFG "$key" | tr -d '"'
}

# only run script if first vrrp interface is in master state
for state in /run/keepalived/*.state ; do
    if [ "$(cat "$state")" != "MASTER" ]; then
        exit 0
    fi
    break
done

ldapsearch -Q -LLL "(&(objectClass=device)(description=Aten PE*))" cn | \
    awk '{ if ($1 == "cn:") print $2 }' | while read -r name
do
    location="$(snmp_get "$name" RFC1213-MIB::sysLocation.0 | \
        tr '[:upper:]' '[:lower:]' | tr ' ' '_')"
    snmpwalk -v 1 -c "$community" "$name" -Oq \
        -m ATEN-PE-CFG ATEN-PE-CFG::outletName | while read -r port device
    do
        port="$(echo "$port" | cut -d '.' -f 2)"
        device="$(echo "$device" | tr -d '"')"
        case "$device" in
            "N/A"|"00 "|"unused")
                continue
                ;;
        esac
	for key in Current Power Voltage ; do
            topic="home/${location}/${device}/$(echo "$key" | tr '[:upper:]' '[:lower:]')"
	    value="$(snmp_get "$name" "ATEN-PE-CFG::outlet${key}.${port}")"
            mqtt_send "$topic" "$value"
        done
    done
done