# Purge the URLs contained in purge-list.txt from the Cloudflare cache
#
# We delay this job to give the pages:deploy job time to finish. If we don't
# delay, then the cache might refill with old pages before the new pages are
# finished deploying.
purge-cache:
  tags:
    - docker
  rules:
    - if: $CF_PURGE_CACHE_ZONE && $CF_PURGE_CACHE_TOKEN
      when: delayed
      start_in: 3 minutes
  needs:
    - pipeline: $PARENT_PIPELINE_ID
      job: create-purge-list
  before_script:
    # Make sure the purge-list.txt file is readable, else exit
    - test -r purge-list.txt || { echo "purge-list.txt not found" ; exit 1 ; }
    - echo "Purge list has $(cat purge-list.txt | wc -l) URLs"
    # Default to chunks of 30 URLs because Cloudflare only allows 30 URLs per
    # purge request on free accounts
    - echo "Chunk size of ${CF_PURGE_CACHE_CHUNK_SIZE:=30}"
  script:
    # Split the purge list into chunks named 'purge-chunk-[aaa,aab,...]'
    - split -l $CF_PURGE_CACHE_CHUNK_SIZE -a 3 purge-list.txt purge-chunk-
    - chunks=$(find . -type f -name 'purge-chunk-*' | wc -l)
    # Loop over the chunks, creating a purge request for each
    - |-
      counter=0
      for chunk in purge-chunk-* ; do
        echo -e "\nChunk $((++counter))/$chunks"
        # Create the purge request body
        echo -en "{\n  \"files\": [" > purge.json
        unset comma # This needs to be unset for the first line in each chunk
        while read path; do
          echo -en "$comma\n    \"$path\"" >> purge.json
          comma=','
        done < $chunk
        echo -e "\n  ]\n}" >> purge.json
        cat purge.json
        # Make the API request to Cloudflare to purge the URLs from cache
        wget -qO- "https://api.cloudflare.com/client/v4/zones/$CF_PURGE_CACHE_ZONE/purge_cache" \
          --header "Content-Type: application/json" \
          --header "Authorization: Bearer $CF_PURGE_CACHE_TOKEN" \
          --post-file purge.json
        # Rate limit ourselves to 1 request per second
        sleep 1
      done


# vi: set ts=2 sw=2 et ft=yaml:
