mirror of
https://github.com/stefanprodan/podinfo.git
synced 2026-08-19 04:06:27 +00:00
Stefan Prodan
72c51ed43b
- Introduced a new `warm-cache` CronJob to periodically preload the cache. - Added supporting scripts (`warm-cache.sh`, `warm-cache-init.sh`) to manage the cache warm-up process. - Configured `ServiceAccount` for the frontend deployment to enhance security. - Adjusted HPA minimum replicas from 1 to 2 for better availability. - Set frontend deployment to use debug log level. Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>
70 lines
2.2 KiB
Bash
Executable File
70 lines
2.2 KiB
Bash
Executable File
#!/bin/sh
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set -e
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# This is a simulation of a cache warming process.
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# It fetches the frontend info, stores it in the cache under the job pod
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# hostname and reads it back to verify the round-trip.
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#
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# Log lines mimic the Log4j 2 default PatternLayout:
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# %d{yyyy-MM-dd HH:mm:ss,SSS} [%thread] %-5level %logger{36} - %msg
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LOGGER="com.stefanprodan.podinfo.WarmCache"
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THREAD="main"
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log() {
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level="$1"
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shift
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# millisecond precision timestamp; fall back gracefully if %N is unsupported
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ts="$(date '+%Y-%m-%d %H:%M:%S,%N' 2>/dev/null)"
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case "$ts" in
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*%N|*,) ts="$(date '+%Y-%m-%d %H:%M:%S'),000" ;;
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*) ts="$(echo "$ts" | cut -c1-23)" ;;
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esac
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printf '%s [%s] %-5s %s - %s\n' "$ts" "$THREAD" "$level" "$LOGGER" "$*"
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}
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FRONTEND="${FRONTEND_URL:-http://frontend}"
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KEY="$(hostname)"
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START="$(date +%s)"
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log INFO "Fetching info from ${FRONTEND}/api/info"
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# Compact the (pretty-printed) JSON onto a single line so each log event
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# stays on one line, as Log4j renders them.
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INFO="$(curl -fsS "${FRONTEND}/api/info" | tr -d '\n' | sed 's/ */ /g')"
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log INFO "Info: ${INFO}"
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# Log each field of the info response on its own line. The /api/info payload
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# is a flat JSON object of string values, so we can split it without jq.
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echo "$INFO" | sed 's/^{//; s/}$//' | tr ',' '\n' | while IFS= read -r field; do
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field="$(echo "$field" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//; s/"//g')"
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if [ -n "$field" ]; then
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log DEBUG "info ${field}"
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fi
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done
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log INFO "Writing info to cache key ${KEY}"
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curl -fsS -X POST -H "Content-Type: application/json" -d "${INFO}" "${FRONTEND}/cache/${KEY}"
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# Verify the cached value for 1 minute, polling every 10 seconds.
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attempt=1
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while [ "$attempt" -le 6 ]; do
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log INFO "Reading cache key ${KEY} (attempt ${attempt}/6)"
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CACHED="$(curl -fsS "${FRONTEND}/cache/${KEY}")"
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if [ "${INFO}" = "${CACHED}" ]; then
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log INFO "Cache warm verified: cached value matches info"
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else
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log ERROR "Cache warm failed: cached value does not match info"
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log ERROR "Expected: ${INFO}"
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log ERROR "Got: ${CACHED}"
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exit 1
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fi
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attempt=$((attempt + 1))
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if [ "$attempt" -le 6 ]; then
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sleep 10
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fi
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done
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log INFO "Cache warm finished in $(( $(date +%s) - START ))s"
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