net/mwan3: add downtime ubus information

Get downtime information for the tracked mwan3 wan interfaces.
The information shows how long this interface is in disconnected state.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

net/mwan3/files/usr/libexec/rpcd/mwan3

@@ -37,7 +37,8 @@ get_mwan3_status() {
 	local running="0"
 	local age=0
 	local uptime=0
-	local pid device time_p time_n time_u
+	local downtime=0
+	local pid device time_p time_n time_u time_d
 
 	network_get_device device $1
 
@@ -59,9 +60,16 @@ get_mwan3_status() {
 			let uptime=time_n-time_u
 		}
 
+		time_d="$(cat "$MWAN3TRACK_STATUS_DIR/${iface}/DOWNTIME")"
+		[ -z "${time_d}" ] || [ "${time_d}" = "0" ] || {
+			time_n="$(get_uptime)"
+			let downtime=time_n-time_d
+		}
+
 		json_add_object "${iface}"
 		json_add_int age "$age"
 		json_add_int uptime "${uptime}"
+		json_add_int downtime "${downtime}"
 		json_add_int "score" "$(cat "$MWAN3TRACK_STATUS_DIR/${iface}/SCORE")"
 		json_add_int "lost" "$(cat "$MWAN3TRACK_STATUS_DIR/${iface}/LOST")"
 		json_add_int "turn" "$(cat "$MWAN3TRACK_STATUS_DIR/${iface}/TURN")"

net/mwan3/files/usr/sbin/mwan3track

@@ -109,9 +109,11 @@ main() {
 	if [ "$STATUS" = "unknown" ]; then
 		echo "unknown" > /var/run/mwan3track/$1/STATUS
 		echo "0" > /var/run/mwan3track/$1/UPTIME
+		echo "$(get_uptime)" > /var/run/mwan3track/$1/DOWNTIME
 		score=0
 	else
 		echo "online" > /var/run/mwan3track/$1/STATUS
+		echo "0" > /var/run/mwan3track/$1/DOWNTIME
 		echo "$(get_uptime)" > /var/run/mwan3track/$1/UPTIME
 		env -i ACTION="connected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface
 	fi
@@ -202,6 +204,7 @@ main() {
 			if [ $score -eq $up ]; then
 				echo "offline" > /var/run/mwan3track/$1/STATUS
 				echo "0" > /var/run/mwan3track/$1/UPTIME
+				echo "$(get_uptime)" > /var/run/mwan3track/$1/DOWNTIME
 				$LOG notice "Interface $1 ($2) is offline"
 				env -i ACTION=ifdown INTERFACE=$1 DEVICE=$2 /sbin/hotplug-call iface
 				env -i ACTION="disconnected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface
@@ -243,6 +246,7 @@ main() {
 
 		if [ "${IFDOWN_EVENT}" -eq 1 ]; then
 			echo "offline" > /var/run/mwan3track/$1/STATUS
+			echo "$(get_uptime)" > /var/run/mwan3track/$1/DOWNTIME
 			echo "0" > /var/run/mwan3track/$1/UPTIME
 			$LOG notice "Interface $1 ($2) is offline"
 			env -i ACTION="disconnected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface