cloudflare-cache-purge.bash

#!/bin/bash

set -e

echo "Started at $(date)"
echo "Will watch for ${K8S_WWW_DEPLOYMENT?} to change in ns ${K8S_WWW_NAMESPACE?}"
echo "And purge app ${K8S_WWW_APP?}'s URLs: ${CLOUDFLARE_PURGE_URLS:-entire zone}"
echo "Current deployments:"
kubectl -n "$K8S_WWW_NAMESPACE" get deployment

deployment_image() {
    kubectl -n "$K8S_WWW_NAMESPACE" get deployment "$K8S_WWW_DEPLOYMENT" --output=json \
        | jq -r '.spec.template.spec.containers[].image'
}

replicaset_images() {
    kubectl -n "$K8S_WWW_NAMESPACE" get replicaset --output=json \
        | jq -r ".items[] | select(.metadata.labels.app == \"${K8S_WWW_APP}\" and .spec.replicas > 0) | .spec.template.spec.containers[].image"
}

new_image="$(deployment_image)"
attempts=0
echo "Waiting for ${new_image} to be ready..."
while test "$(replicaset_images)" != "$new_image"; do
    attempts="$((attempts + 1))"
    echo "Other images are still running (checked ${attempts} times)"
    sleep 3
    if test "$attempts" -ge 100; then
        echo "Timed out waiting for other deployments to stop"
        exit 1
    fi
done

echo "Ready at $(date)"

purge() {
    iterations=3
    wait=30
    endpoint="https://api.cloudflare.com/client/v4/zones/${CLOUDFLARE_ZONEID?}/purge_cache"
    for ((i=1; i<=iterations; i++))
    do
        echo "Purging cache at $endpoint, iteration $i..."
        curl -X POST "$endpoint" \
            -H "X-Auth-Email: ${CLOUDFLARE_EMAIL?}" \
            -H "X-Auth-Key: ${CLOUDFLARE_TOKEN?}" \
            -H 'Content-Type: application/json' \
            -d "$*" | jq .

        if [ $i -lt $iterations ]; then
            echo "Sleeping for $wait seconds..."
            sleep $wait
        fi
    done
}

if test -n "$CLOUDFLARE_PURGE_URLS"; then
    purge '{"purge_everything": true}'
else
    purge "$(jq -n --arg urls "$CLOUDFLARE_PURGE_URLS" '{"files": $urls | split(" ")}')"
fi