#!/bin/bash
#
# This script is designed to be run inside the container
#

# fail hard and fast even on pipelines
set -eo pipefail

# set debug based on envvar
[[ $DEBUG ]] && set -x

# configure etcd
export ETCD_PORT=${ETCD_PORT:-4001}
export ETCD="$HOST:$ETCD_PORT"
export ETCD_PATH=${ETCD_PATH:-/deis/router/$HOST}
export ETCD_TTL=${ETCD_TTL:-10}

# wait for etcd to be available
until etcdctl --no-sync -C $ETCD ls >/dev/null; do
    echo "waiting for etcd at $ETCD..."
    sleep $(($ETCD_TTL/2))  # sleep for half the TTL
done

# wait until etcd has discarded potentially stale values
sleep $(($ETCD_TTL+1))

function etcd_safe_mkdir {
  etcdctl --no-sync -C $ETCD mkdir $1 >/dev/null 2>&1 || true
}

function etcd_safe_set {
  if ! etcdctl --no-sync -C $ETCD get $ETCD_PATH/$1 >/dev/null 2>&1; then
    etcdctl --no-sync -C $ETCD set $ETCD_PATH/$1 $2 >/dev/null
  fi
}

etcd_safe_mkdir /deis/controller
etcd_safe_mkdir /deis/services
etcd_safe_mkdir /deis/domains
etcd_safe_mkdir /deis/builder
etcd_safe_set port ${PORT:-80}
etcd_safe_set gzip on
etcd_safe_set gzipHttpVersion 1.0
etcd_safe_set gzipCompLevel 2
etcd_safe_set gzipProxied any
etcd_safe_set gzipVary on
etcd_safe_set gzipDisable "\"msie6\""
etcd_safe_set gzipTypes "application/x-javascript, application/xhtml+xml, application/xml, application/xml+rss, application/json, text/css, text/javascript, text/plain, text/xml"

# wait for confd to run once and install initial templates
until confd -onetime -node $ETCD -config-file /app/confd.toml >/dev/null 2>/dev/null; do
    echo "router: waiting for confd to write initial templates..."
    sleep $(($ETCD_TTL/2))  # sleep for half the TTL
done

# spawn the service in the background
echo "Starting Nginx..."
/usr/sbin/nginx &
SERVICE_PID=$!

# smart shutdown on SIGINT and SIGTERM
function on_exit() {
    kill -TERM $SERVICE_PID
    wait $SERVICE_PID 2>/dev/null
}
trap on_exit INT TERM

# spawn confd in the background to update services based on etcd changes
confd -node $ETCD -config-file /app/confd.toml &
CONFD_PID=$!

echo deis-router running...

# publish the service to etcd using the injected PORT
if [[ ! -z $PUBLISH ]]; then

  # configure service discovery
  PORT=${PORT:-80}
  PROTO=${PROTO:-tcp}

    set +e

  # wait for the service to become available on PUBLISH port
  sleep 1 && while [[ -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do sleep 1; done

  # while the port is listening, publish to etcd
  while [[ ! -z $(netstat -lnt | awk "\$6 == \"LISTEN\" && \$4 ~ \".$PUBLISH\" && \$1 ~ \"$PROTO.?\"") ]] ; do
    etcdctl --no-sync -C $ETCD set $ETCD_PATH/host $HOST --ttl $ETCD_TTL >/dev/null
    etcdctl --no-sync -C $ETCD set $ETCD_PATH/port $PORT --ttl $ETCD_TTL >/dev/null
    sleep $(($ETCD_TTL/2)) # sleep for half the TTL
  done

  # if the loop quits, something went wrong
  exit 1

fi

wait
