Updating Magento Varnish Servers in env.php

m2_update_varnish_in_env.sh

#!/usr/bin/env bash

set -eu

# Variables
LOG_PATH="/home/www-upload/update_magento_varnish_config.log"
MAGENTO_PATH="/var/www/html/current"

# Get Webscale App Servers
APP_SERVERS=$(webscale-cli apps servers)
#echo "${APP_SERVERS}"

# Build list of varnish servers
VARNISH_SERVERS=""
while read -r EACH_APP_SERVER; do
  [ -z "${EACH_APP_SERVER}" ] && continue # Exclude empty lines
  [[ "${VARNISH_SERVERS}" != "" ]] && EACH_APP_SERVER=$(echo -e "\n${EACH_APP_SERVER}")
  VARNISH_SERVERS=$(echo -e "${VARNISH_SERVERS}${EACH_APP_SERVER}:8080")
done <<< "${APP_SERVERS}"
#echo "${VARNISH_SERVERS}"

# List all the existing Varnish Servers
cd ${MAGENTO_PATH}
set +H # disable history expansion
PHP_CODE=$(cat <<'PHP_CODE'
<?php
$env = include("app/etc/env.php");
var_export($env, true);
foreach ($env['http_cache_hosts'] as $each_host) {
  echo $each_host['host'] . ":" . $each_host['port'] . "\n";
}
PHP_CODE
)
set -H # re-enable history expansion
MAGENTO_CONFIG=$(echo "${PHP_CODE}" | php)
#echo "${MAGENTO_CONFIG}"

# Loop through all VARNISH_SERVERS
MATCHED_LIST=""
while read -r EACH_ACTUAL; do
  [ -z "${EACH_ACTUAL}" ] && continue # Exclude empty lines
  
  # EACH: Check if value from VARNISH_SERVERS exists in MAGENTO_CONFIG
  FOUND=0
  while read -r EACH_CONFIG; do
    [ -z "${EACH_CONFIG}" ] && continue # Exclude empty lines
    [[ "${EACH_ACTUAL}" == "${EACH_CONFIG}" ]] && FOUND=1
  done <<< "${MAGENTO_CONFIG}"
  
  # EACH: Add found to MATCHED_LIST
  ADD_TO_MATCHES="${EACH_ACTUAL}"
  [[ "${FOUND}" == "1" ]] && [[ "${MATCHED_LIST}" != "" ]] && ADD_TO_MATCHES=$(echo -e "\n${ADD_TO_MATCHES}")
  [[ "${FOUND}" == "1" ]] && MATCHED_LIST=$(echo "${MATCHED_LIST}${ADD_TO_MATCHES}")
done <<< "${VARNISH_SERVERS}"
#echo "${MATCHED_LIST}"

# Check count of VARNISH_SERVERS, MAGENTO_CONFIG, MATCHED_LIST
ACTUAL_COUNT=$(echo "${VARNISH_SERVERS}" | wc -l)
CONFIG_COUNT=$(echo "${MAGENTO_CONFIG}" | wc -l)
MATCH_COUNT=$(echo "${MATCHED_LIST}" | wc -l)

# If they all aren't the same, update Magento configs and log change
if [[ "${ACTUAL_COUNT}" != "${MATCH_COUNT}" ]] || [[ "${CONFIG_COUNT}" != "${MATCH_COUNT}" ]]; then
  # Build http cache hosts parameter
  HTTP_CACHE_HOSTS=""
  while read -r EACH_HOST; do
    [ -z "${EACH_HOST}" ] && continue # Exclude empty lines
    [[ "${HTTP_CACHE_HOSTS}" != "" ]] && HTTP_CACHE_HOSTS=$(echo "${HTTP_CACHE_HOSTS},")
    HTTP_CACHE_HOSTS=$(echo "${HTTP_CACHE_HOSTS}${EACH_HOST}")
  done <<< "${VARNISH_SERVERS}"
  #echo "${HTTP_CACHE_HOSTS}"

  # Update Magento env.php config
  cd ${MAGENTO_PATH}
  php bin/magento setup:config:set -n --http-cache-hosts=${HTTP_CACHE_HOSTS}
  
  # Log Changes
  TIMESTAMP=$(date '+%Y-%m-%d %H:%M:%S')
  echo "${TIMESTAMP} Updated http-cache-hosts to: ${HTTP_CACHE_HOSTS}" >> ${LOG_PATH}
fi



# echo "ACTUAL_COUNT: ${ACTUAL_COUNT}"
# echo "CONFIG_COUNT: ${CONFIG_COUNT}"
# echo "MATCH_COUNT: ${MATCH_COUNT}"
#
# # If they all aren't the same, update Magento configs and log change
# if [[ "${ACTUAL_COUNT}" != "${MATCH_COUNT}" ]] || [[ "${CONFIG_COUNT}" != "${MATCH_COUNT}" ]]; then
#   echo "needs updates"
# else
#   echo "all is well"
# fi