#! /bin/sh

#
# ping the peer radio each second, and touch a file (up or down)
#

. /etc/utils.sh

# If DoNotGenerateAlarmLogs experiment is present then script will
# not print ping state periodically.
register_experiment DoNotGenerateAlarmLogs

rm -f /tmp/peer-up /tmp/peer-down

last_print_time=0
last_change_time=0
last=
while sleep 1; do
  addr=$(ptp-config -g peer_ipaddr)
  addr=${addr%%/*}
  log="false"

  if ! ping -q -c 1 -w 1 "$addr" 2>&1 >/dev/null; then
    new=down
    print_every_seconds=30
  else
    new=up
    print_every_seconds=120
  fi
  if [ "$last" != "$new" ]; then
    rm -f /tmp/peer-up /tmp/peer-down
    >/tmp/peer-"$new"
    log="true"
    last_change_time=$(date +%s)
  else
    last_printed=$((now - last_print_time))
    if [ "$last_printed" -ge "$print_every_seconds" ]; then
      log="true";
    fi
    if experiment DoNotGenerateAlarmLogs; then
      # never print periodically
      log="false";
    fi
  fi

  now=$(date +%s)
  if [ "$log" = "true" ]; then
    seconds_since_change=$((now - last_change_time))
    echo "peer is $new changed $seconds_since_change seconds ago"
    last_print_time=$(date +%s)
  fi

  last="$new"
done