#!/usr/bin/env bash
# Copyright 2017, Rackspace US, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

## Shell Opts ----------------------------------------------------------------
set -e

## Functions -----------------------------------------------------------------
function cleanup {
  echo "Running Cleanup."
  systemctl unset-environment _WSREP_NEW_CLUSTER || systemctl set-environment _WSREP_NEW_CLUSTER=''
  if [[ -f "/etc/my.cnf.d/99_bootstrap.cnf" ]]; then
    rm /etc/my.cnf.d/99_bootstrap.cnf
  fi
}

function wait_operational {
  WAITCMD="while ! mysql --silent --skip-column-names -e 'SHOW STATUS LIKE \"wsrep_evs_state\"' | grep -wq \"OPERATIONAL\"; do sleep 5; done"
  if ! timeout 180 sh -c "${WAITCMD}"; then
    echo "Cluster failed to return an \"OPERATIONAL\" state"
    return 1
  else
    echo "Cluster is now OPERATIONAL"
    return 0
  fi
}

function bootstrap_opts {
  cat > /etc/my.cnf.d/99_bootstrap.cnf <<EOF
[mysqld]
wsrep_new_cluster
EOF
}

## Main ----------------------------------------------------------------------
trap cleanup EXIT INT TERM

EXIT_CODE=0
if ! systemctl status {{ mysql_service_name }}> /dev/null; then
  systemctl set-environment _WSREP_NEW_CLUSTER='--wsrep-new-cluster'
  if grep -rniq -e suse -e opensuse /etc/os-release; then
    bootstrap_opts
  fi
  if systemctl start {{ mysql_service_name }}; then
    EXIT_CODE=3
  else
    echo "Cluster bootstrap failed."
    systemctl status {{ mysql_service_name }}
    exit 99
  fi
fi

wait_operational

cat <<EOF
NOTICE: Exit code 0 and 3 are success.
        Exit 0 is no change, exit 3 is change.
        Current Exit Code "${EXIT_CODE}"
EOF

exit ${EXIT_CODE}