#!/bin/bash

# Make the site live again, for instance by tweaking a .htaccess file
# or starting a node server. In this example we also set up a
# data/port file so that sc-proxy.js can figure out what port
# to forward traffic to for this site. The idea is that every
# folder in /var/webapps represents a separate project with a separate
# node process, each listening on a specific port, and they all
# need traffic forwarded from a reverse proxy server on port 80

# Useful for debugging
#set -x verbose

# Express should not reveal information on errors,
# also optimizes Express performance
export NODE_ENV=production

if [ ! -f "app.js" ]; then
  echo "I don't see app.js in the current directory."
  exit 1
fi

# Assign a port number if we don't yet have one

if [ -f "data/port" ]; then
  PORT=`cat data/port`
else
  # No port set yet for this site. Scan and sort the existing port numbers if any,
  # grab the highest existing one
  PORT=`cat ../../../*/data/port 2>/dev/null | sort -n | tail -1`
  if [ "$PORT" == "" ]; then
  	echo "First app ever, assigning port 3000"
  	PORT=3000
  else
    # Bash is much nicer than sh! We can do math without tears!
    let PORT+=1
  fi
  echo $PORT > data/port
  echo "First startup, chose port $PORT for this site"
fi

# Run the app via 'forever' so that it restarts automatically if it fails
# Use `pwd` to make sure we have a full path, forever is otherwise easily confused
# and will stop every server with the same filename

# Use a "for" loop. A classic single-port file will do the
# right thing, but so will a file with multiple port numbers
# for load balancing across multiple cores
for port in $PORT
do
  export PORT=$port
  forever --minUptime=1000 --spinSleepTime=10000 -o data/console.log -e data/error.log start `pwd`/app.js && echo "Site started"
done

# Run the app without 'forever'. Record the process id so 'stop' can kill it later.
# We recommend installing 'forever' instead for node apps. For non-node apps this code
# may be helpful
#
# node app.js >> data/console.log 2>&1 &
# PID=$!
# echo $PID > data/pid
#	
#echo "Site started"