net/mwan3: add uptime ubus information

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

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

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

@@ -36,7 +36,8 @@ get_mwan3_status() {
 	local iface_select="${2}"
 	local running="0"
 	local age=0
-	local pid device time_p time_n
+	local uptime=0
+	local pid device time_p time_n time_u
 
 	network_get_device device $1
 
@@ -52,8 +53,15 @@ get_mwan3_status() {
 			let age=time_n-time_p
 		}
 
+		time_u="$(cat "$MWAN3TRACK_STATUS_DIR/${iface}/UPTIME")"
+		[ -z "${time_u}" ] || [ "${time_u}" = "0" ] || {
+			time_n="$(get_uptime)"
+			let uptime=time_n-time_u
+		}
+
 		json_add_object "${iface}"
 		json_add_int age "$age"
+		json_add_int uptime "${uptime}"
 		json_add_int "score" "$(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

@@ -108,9 +108,11 @@ main() {
 
 	if [ "$STATUS" = "unknown" ]; then
 		echo "unknown" > /var/run/mwan3track/$1/STATUS
+		echo "0" > /var/run/mwan3track/$1/UPTIME
 		score=0
 	else
 		echo "online" > /var/run/mwan3track/$1/STATUS
+		echo "$(get_uptime)" > /var/run/mwan3track/$1/UPTIME
 		env -i ACTION="connected" INTERFACE="$1" DEVICE="$2" /sbin/hotplug-call iface
 	fi
 	while true; do
@@ -199,6 +201,7 @@ main() {
 
 			if [ $score -eq $up ]; then
 				echo "offline" > /var/run/mwan3track/$1/STATUS
+				echo "0" > /var/run/mwan3track/$1/UPTIME
 				$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
@@ -240,6 +243,7 @@ main() {
 
 		if [ "${IFDOWN_EVENT}" -eq 1 ]; then
 			echo "offline" > /var/run/mwan3track/$1/STATUS
+			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
 			score=0