#!/bin/sh
# Start the NS1 Mongo SSH tunnel if nothing is already listening on 127.0.0.1:27017.
set -eu
ROOT="$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)"
TUNNEL="$ROOT/scripts/mongo-tunnel.sh"
LOG="${ZAPIER_TUNNEL_LOG:-$HOME/.grok/zapier-mongo-tunnel.log}"

if nc -z 127.0.0.1 27017 2>/dev/null; then
  echo "mongo tunnel: already up (127.0.0.1:27017)"
  exit 0
fi

if [ ! -x "$TUNNEL" ]; then
  echo "missing $TUNNEL" >&2
  exit 1
fi

mkdir -p "$(dirname "$LOG")"
nohup "$TUNNEL" >>"$LOG" 2>&1 &
echo $! >"${ZAPIER_TUNNEL_PIDFILE:-$HOME/.grok/zapier-mongo-tunnel.pid}"

i=0
while [ "$i" -lt 20 ]; do
  if nc -z 127.0.0.1 27017 2>/dev/null; then
    echo "mongo tunnel: started (pid $(cat "${ZAPIER_TUNNEL_PIDFILE:-$HOME/.grok/zapier-mongo-tunnel.pid}"))"
    exit 0
  fi
  i=$((i + 1))
  sleep 0.25
done

echo "mongo tunnel: failed to bind 127.0.0.1:27017 — see $LOG" >&2
exit 1