start-worker.sh

#!/usr/bin/env bash

if [[ "$OSTYPE" == *darwin* ]]; then
  if command -v greadlink >/dev/null 2>&1; then
    scriptPath=$(dirname "$(greadlink -f "$0")")
  else
    echo "greadlink command not found"
    exit 1
  fi
else
  scriptPath=$(dirname "$(readlink -f "$0")")
fi
cd "${scriptPath}/" || exit 1

function display_help() {
  echo "Start worker for ove-asset-manager"
  echo
  echo "usage: start-worker.sh [option]..."
  echo "   --port       Worker service port"
  echo "   --class      The worker class, e.g. workers.dzi.DeepZoomImageWorker"
  echo "   --name       The worker name, autogenerated if missing"
}

while [[ $# -gt 0 ]]; do
  key="$1"
  case ${key} in
  -h | --help)
    display_help
    exit 0
    ;;
  --port)
    GUNICORN_PORT="$2"
    shift
    ;;
  --class)
    WORKER_CLASS="$2"
    shift
    ;;
  --name)
    WORKER_NAME="$2"
    shift
    ;;
  *)
    echo "Unrecognised option: $key"
    echo
    display_help
    exit 1
    ;;
  esac
  shift
done

[[ ! -z "${GUNICORN_PORT}" ]] || GUNICORN_PORT="6090"
[[ ! -z "${GUNICORN_HOST}" ]] || GUNICORN_HOST="0.0.0.0"
[[ ! -z "${GUNICORN_WORKERS}" ]] || GUNICORN_WORKERS="1"
[[ ! -z "${GUNICORN_THREADS}" ]] || GUNICORN_THREADS="4"
[[ ! -z "${GUNICORN_TIMEOUT}" ]] || GUNICORN_TIMEOUT="240" # this needs to be tuned based on the network bandwidth

[[ ! -z "${SERVICE_LOG_LEVEL}" ]] || SERVICE_LOG_LEVEL="debug"
[[ ! -z "${WORKER_NAME}" ]] || WORKER_NAME=$(strings /dev/urandom | grep -o '[[:alnum:]]' | head -n 21 | tr -d '\n')
# for MacOs and BSD-like systems
[[ ! -z "${WORKER_NAME}" ]] || WORKER_NAME=$(echo $(cat /dev/urandom | base64 | tr -dc "[:alnum:]" | head -c10))

[[ ! -z "${WORKER_CONFIG}" ]] || WORKER_CONFIG="config/worker.json"

# For testing purpose this can be used, otherwise the next line should be commented
# [[ ! -z "${WORKER_CLASS}" ]] || WORKER_CLASS="workers.dzi.DeepZoomImageWorker"

echo "Environment variables:"
echo "  GUNICORN_PORT=${GUNICORN_PORT}"
echo "  GUNICORN_HOST=${GUNICORN_HOST}"
echo "  GUNICORN_WORKERS=${GUNICORN_WORKERS}"
echo "  GUNICORN_THREADS=${GUNICORN_THREADS}"
echo ""
echo "  SERVICE_LOG_LEVEL=${SERVICE_LOG_LEVEL}"
echo "  WORKER_NAME=${WORKER_NAME}"
echo "  WORKER_CLASS=${WORKER_CLASS}"
echo ""
echo "  WORKER_CONFIG=${WORKER_CONFIG}"
echo ""

## did you activate the virtual environment and install the requirements?
exec gunicorn --bind "${GUNICORN_HOST}:${GUNICORN_PORT}" --workers ${GUNICORN_WORKERS} --threads ${GUNICORN_THREADS} --timeout ${GUNICORN_TIMEOUT} \
  "workers.base:setup_worker(logging_level='${SERVICE_LOG_LEVEL}', worker_name='${WORKER_NAME}', worker_class='${WORKER_CLASS}', config_file='${WORKER_CONFIG}')"