Nginx fastcgi/proxy Cache Manager

nginx-cache.sh

#!/bin/bash

# search and optionally purge cached content from nginx by URL or parts of the URL

# you can set the default cache dir
DEFAULT_NGINX_CACHE_DIR=/dev/shm/nginx


function usage {
  echo "nginx cache - search and purge content from nginx"
  echo ""
  echo "Searches for a 'query' in the Nginx cache key set by proxy_cache_key,"
  echo "which is most likely defined as the url of the cached content"
  echo "Hint: proxy_cache_key might be set including port number (host:port)"
  echo ""
  echo "Usage:"
  echo "    $0 [flags] <query> [cachedir]"
  echo ""
  echo "Flags:"
  echo "    -d         purge content when query matches"
  echo ""
  echo "Arguments:"
  echo "    query      string to search in nginx cache key"
  echo "    cachedir   path to nginx cache dir. (default: $DEFAULT_NGINX_CACHE_DIR)"
}


DELETE=0

# parse flags
OPTIND=1
while getopts "dh" options; do
  case $options in
     d ) DELETE=1 ;;
     h ) usage ;;
     * ) usage ;;
  esac
done
shift $((OPTIND-1))


QUERY=$1
CACHEDIR=${2:-$DEFAULT_NGINX_CACHE_DIR}

if [ -z ${QUERY} ]; then
  echo -e "Error: No query given\n"
  usage
  exit
fi
if [ ! -d "${CACHEDIR}" ]; then
  echo -e "Error: Nginx Cache Dir does not exist\n"
  usage
  exit
fi

# now search
echo -e "Searching for query \033[1m${QUERY}\033[0m\n"

# grep matches
MATCHES=`grep --text -r "KEY:" ${CACHEDIR} | grep ${QUERY}`
MATCHES_FILES=`echo "$MATCHES" |cut -d ":" -f1 `

if [ -z "${MATCHES}" ]; then
  echo "No matches found"
  MATCH_COUNT=0
else
  MATCH_COUNT=`echo "${MATCHES}" | wc -l`
  echo -e "Found ${MATCH_COUNT} match(es) in ${CACHEDIR}:"
  echo "$MATCHES"

  # if delete option has been set, remove content from cache
  # by deleting the cached file from disk

  if [ ${DELETE} = 1 ]; then
    echo Purging content
    echo "${MATCHES_FILES}" | xargs rm
    echo Done
  fi
fi