It’s very common to see standard invalidation script for AWS Cloudfront / CDN, where invalidation is executed and we just need to wait until the process is finished. In my case, the invalidation is part of the deployment pipeline and it’s quite important to know the status of the invalidation and when to proceed to the next stages.
In the script there is a combination of two aws commands aws cloudfront create-invalidation and aws cloudfront get-invalidation. The first, to trigger invalidation and the second to get current status of it. Please, take a look:
SCRIPT_HEADSIZE=$(head -200 ${0} |grep -n "^# END_OF_HEADER" | cut -f1 -d:)
SCRIPT_NAME="$(basename ${0})"
run_help() {
head -${SCRIPT_HEADSIZE:-99} ${0} | grep -e "^#[%+-]" | sed -e "s/^#[%+-]//g" -e "s/\${SCRIPT_NAME}/${SCRIPT_NAME}/g" ;
}
AWS=aws
HELP=0
INVALIDATION_PATH='/*'
cecho(){
RED="\033[0;31m"
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color
printf "${!1}${2} ${NC}\n"
}
for i in "$@"
do
case $i in
--distributionId)
shift
if [ -z "$1" ]
then
cecho "RED" "Distribution ID cannot be empty"
exit 1
else
DISTRIBUTION_ID="$1"
fi
shift
;;
--path)
shift
INVALIDATION_PATH="$1"
shift
;;
--help)
HELP=1
run_help
shift
;;
-*)
cecho "RED" "Error: Unknown option: $1" >&2
run_help
exit 1
esac
done
get_invalidation_status(){
invalidation=$1
distribution=$2
status=$(
${AWS} cloudfront \
get-invalidation --id "${invalidation}" \
--distribution-id "${distribution}" \
--query Invalidation.Status \
--output text
)
echo "${status}"
}
run_command () {
cecho "GREEN" "Running cdn invalidation for Distribution ID: ${DISTRIBUTION_ID}"
INVALIDATION_ID=$( ${AWS} cloudfront create-invalidation \
--distribution-id "${DISTRIBUTION_ID}" \
--paths ${INVALIDATION_PATH} \
--region us-west-2 \
--query Invalidation.Id \
--output text
)
while true; do
STATUS=$(get_invalidation_status "${INVALIDATION_ID}" "${DISTRIBUTION_ID}")
DATETIME=$(date +%H:%M:%S)
echo "-------------------------"
echo "Distribution: ${DISTRIBUTION_ID}"
echo "Invalidation: ${INVALIDATION_ID}"
echo "Status: ${STATUS}"
echo "Time:" ${DATETIME}
echo "-------------------------"
if [ "${STATUS}" == "Completed" ];
then
cecho "GREEN" "Completed !"
break
fi
sleep 10
done
}
if [ "${HELP}" != 1 ];
then
if [ -z "${DISTRIBUTION_ID}" ];
then
cecho "RED" "Distribution Id is missing !"
exit 1
else
run_command
fi
fi
You can add some feedback to this gist at Github
Don’t just copy & paste
Do not forget to change or modify additional parameters of the script, f.e. aws region, timeout value or others, to make it use in your project!
Interesting note
After a quiet period, I decided to create short post at my blog, thanks to Hugoconf 2022 and a very interesting tech talk about Front Matter VSCode extension, which I use to write this article.
