#!/usr/bin/env bash
# Health groups: keeping a dependency outage out of the liveness probe.
set -uo pipefail
cd "$(dirname "$0")/.."
OUT=docs/output/08-groups-and-probes.txt
B=http://localhost:8080/actuator/health
{
  echo "### profile: groups"
  echo
  echo "--- baseline: upstream UP ---"
  for g in "" liveness readiness startup; do
    u="$B${g:+/$g}"
    printf '  %-40s HTTP %s\n' "GET ${u#http://localhost:8080}" "$(curl -s -o /dev/null -w '%{http_code}' -u ops:ops-password "$u")"
  done
  echo
  echo "--- upstream DOWN (a third party is having an outage) ---"
  curl -s -o /dev/null -u ops:ops-password -X POST "http://localhost:8080/stub/upstream/mode?value=down"
  sleep 1
  for g in "" liveness readiness startup; do
    u="$B${g:+/$g}"
    printf '  %-40s HTTP %s\n' "GET ${u#http://localhost:8080}" "$(curl -s -o /dev/null -w '%{http_code}' -u ops:ops-password "$u")"
  done
  echo
  echo "  liveness stayed 200. readiness went 503."
  echo "  Kubernetes takes this instance out of the Service and leaves the process alone."
  echo "  Wire readiness to /actuator/health and you get a restart loop instead."
  echo
  echo "--- what each group contains ---"
  echo "\$ curl -s $B/liveness"
  curl -s -u ops:ops-password "$B/liveness" | python3 -m json.tool
  echo "\$ curl -s $B/readiness"
  curl -s -u ops:ops-password "$B/readiness" | python3 -m json.tool
  echo
  curl -s -o /dev/null -u ops:ops-password -X POST "http://localhost:8080/stub/upstream/mode?value=up"
} > "$OUT" 2>&1
echo "wrote $OUT"